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Ps call flow

The document provides an overview of the message flow for a packet switched call between a UE and core network. Key steps include: 1) The UE performs cell search and selection before establishing an RRC connection and registering with the core network. 2) The UE then sends an attach request and exchanges authentication and security messages with the core network. 3) Once attached, the UE can activate a packet data protocol context and exchange user plane data for the packet switched call.

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Introduction • This slide set provides a detailed illustration of the message flow observed for an PS call • The message flow is focused upon communication with the packet switched core and does not include communication with the circuit switched core. • The UE starts by searching for candidate cells by correlating the RSSI with the code defining the primary SCH • The UE then achieves radio frame synchronisation and reads the BCCH logical channel • The BCCH provides system information including the cell selection criteria • If the cell passes the cell selection criteria then the UE establishes an RRC connection ad registers with the core network • Having registered the UE activates the PDP context with the CN using the existing CN (assumption is that follow on request pending is set) • In case of no activity (no data nor signalling data transmitted between the UE UE is powered up Read BCCH Cell selection Register with core network Cell State Transitions Radio frame synchronisation Cell search Originating PS Call
Protocol Stacks • Communication between the UE, RNC and packet core makes use of • Uu interface protocol stack • Iub interface protocol stack • Iu,ps interface protocol stack Iub Iu,ps Uu Node B RNC SGSN
PS Radio Interface Control Plane • The radio interface protocol control plane allows RRC signalling between the RNC and UE • RRC signalling is communicated across the Iub using the Iub user plane protocol stack i.e. using Frame protocol and AAL2 based ATM • Acknowledged or unacknowledged mode RLC is used between the UE and RNC WCDMA L1 RRC WCDMA L1 AAL2 FP ATM Phy MAC RLC-C AAL2 FP ATM Phy MAC RLC-C UE No de B RNC Uu Iub RRC
PS User Plane • The SGSN provides connectivity to the packet switched core and applications • Acknowledged mode RLC (or unacknowledged) is used between the UE and RNC • AAL2 based ATM is used to transfer user plane data across the Iub and AAL5 based ATM across Iu,ps interface WCDMA L1 WCDMA L1 AAL2 FP ATM Phy MAC RLC-U AAL2 FP ATM Phy MAC RLC-U AAL5 ATM Phy GTP-U AAL5 ATM Phy UE No de B RNC SGSN Uu Iub Iu,ps UDP IP GTP-U UDP IP
Cell Search • The UE keeps a record of the previously used carrier. The cell search procedure starts by scanning this carrier • The cell search procedure is completed by correlating RSSI against the known Primary SCH code • Peaks in the correlation result indicate the presence of a cell as well as the multipath associated with the propagation channel to that cell Correlation Peaks time Correlation result • Once the UE has identified a cell the UE attempts to synchronise with that cell UE is powered up Read BCCH Cell selection Register with core network Cell State Transitions Radio frame synchronisation Cell search Originating PS Call
Radio Frame Synchronisation Cp Cp Cp Cs1 Cs1Cs2 Primary SCH Secondary SCH Primary CCPCH 256 chips 2560 - 256 chips Slot 1 Slot 2 Slot 15 Slot 1 • The UE completes the three step radio frame synchronisation process • Step 1: Primary SCH identification and slot synchronisation (completed during cell search) • Step 2: Code group identification and frame synchronisation using the Secondary SCH • Step 3: Scrambling code identification using the CPICH • Having completed these three steps the UE is able to decode the Primary CCPCH -> BCH -> BCCH Primary CPICH UE is powered up Read BCCH Cell selection Register with core network Cell State Transitions Radio frame synchronisation Cell search Originating PS Call
Read BCCH • The BCCH encapsulates the System Information message which includes the Master Information Block (MIB), Scheduling Blocks (SB) and System Information Blocks (SIB) UE is powered up Read BCCH Cell selection Register with core network Cell State Transitions Radio frame synchronisation Cell search Originating PS Call
Cell Selection • Cell selection is standardised by 3GPP within TS 25.304 • Cell selection is based upon the S-criteria • UE extracts the S-criteria parameters from SIB 3 • QqualMin • QrxlevMin • UE_TXPWR_MAX_RACH UE is powered up Read BCCH Cell selection Register with core network Cell State Transitions Radio frame synchronisation Cell search Originating PS Call
Register with the Core Network • The UE registers with the PS core domain (the UE also registers with the CS core domain but this slide set concerns only the PS domain) • PS domain registering is a GPRS attach procedure • Registering is achieved by establishing an RRC connection and sending non-access stratum messages to the 3G SGSN • RRC Connection Establishment • GPRS Attach UE is powered up Read BCCH Cell selection Register with core network Cell State Transitions Radio frame synchronisation Cell search Originating PS Call
UTRAN Specific Signalling Protocols 3G-MSC/VLR 3G-SGSN UE Node B RNC RNC RNS RNS RRC Iur: RNSAP Iu-PS: RANAP Iu-CS: RANAP Iub: NBAP
RRC: RRC Connection Request (RACH) UE RNC Node B • If the cell from which the BCCH has been read is suitable to camp upon then the UE follows the instructions in SIB1 to complete a GPRS attach with the PS core network • UE must first establish an RRC connection • The RRC Connection Request message is sent to the RNC using unacknowledged mode RLC on the RACH • The message is sent via the Node B which uses Frame Protocol to encapsulate the transport blocks and send them across the Iub via AAL2 based ATM RRC Connection Request
• The RNC replies to the UE s original’ RRC Connection Request message with an RRC Connection Setup message • The RRC Connection Setup message is sent to the UE on the FACH using unacknowledged mode RLC RRC: RRC Connection Request (RACH) UE RNC Node B NBAP: Radio Link Setup Request NBAP: Radio Link Setup Response ALCAP: Establish Request RRC Connection Setup ALCAP: Establish Confirm FP: Downlink Sync FP: Uplink Sync RRC: RRC Connection Setup (FACH)
• UE transmits the RRC Connection Setup Complete message using SRB 2 on the newly established DCH RRC: RRC Connection Request (RACH) UE RNC Node B NBAP: Radio Link Setup Request NBAP: Radio Link Setup Response ALCAP: Establish Request RRC Connection Setup Complete ALCAP: Establish Confirm FP: Downlink Sync FP: Uplink Sync NBAP: Synchronisation Indication RRC: RRC Connection Setup (FACH) L1 Synchronisation RRC: RRC Connection Setup Complete (DCH)
GPRS Attach Request RRC Connection Request (RACH) RRC Connection Setup (FACH) RRC Connection Setup Complete (DCH) Initial Direct Transfer: GPRS Attach Request (DCH) UE RNC SGSNNode B • The UE has now established a dedicated communication link with UTRAN and is in a position to send a message to the core network (PS core in this case) • The UE uses an uplink RRC: Initial Direct Transfer message to encapsulate and send a GPRS MM : Attach Request message to the RNC • The Node B extracts the RRC: Initial Direct Transfer message and encapsulates it within a DCH Frame Protocol frame • The RNC extracts the Attach Request message and encapsulates it within a RANAP: Initial UE Message message prior to forwarding it to the SGSN Initial UE message : GPRS Attach Request SCCP: Connection Request • The RANAP: Initial UE Message message is accompanied with a SCCP: Connection Request message which is used to establish the Iu-PS connection
Connection Confirm SCCP: Connection Confirm • The SCCP layer of the Iu-PS protocol stack responds to the Connection Request message with a Connection Confirm message • The link is specified as being connection orientated RRC Connection Request (RACH) RRC Connection Setup (FACH) RRC Connection Setup Complete (DCH) Initial Direct Transfer: GPRS Attach Request (DCH) UE RNC SGSNNode B Initial UE message : GPRS Attach Request SCCP: Connection Request
Direct Transfer: Authentication and Ciphering Request Authentication and Ciphering Request • Having received the Attach Request message the PS core responds with an Authentication and Ciphering Request message • The Authentication and Ciphering Request message is sent to the RNC encapsulated within a RANAP Direct Transfer message • The RNC extracts the Authentication and Ciphering Request message and encapsulates it within an RRC Downlink Direct Transfer message • The RNC then encapsulates the RRC Downlink Direct Transfer message within a downlink Frame Protocol data frame prior to forwarding it to the Node B • The Node B extracts the RRC Downlink Direct Transfer message and forwards it to the UE Downlink Direct Transfer: Authentication and Ciphering Request (DCH) SCCP: Connection Confirm RRC Connection Request (RACH) RRC Connection Setup (FACH) RRC Connection Setup Complete (DCH) Initial Direct Transfer: GPRS Attach Request (DCH) UE RNC SGSNNode B Initial UE message : GPRS Attach Request SCCP: Connection Request
Authentication and Ciphering Response Uplink Direct Transfer: Authenication and Ciphering Response (DCH) • Having received the Authentication and Ciphering Request message the UE responds with an Authentication and Ciphering Response message • The Authentication and Ciphering Response message is sent to the Node B encapsulated within an RRC Uplink Direct Transfer message • The Node B encapsulates the RRC Uplink Direct Transfer message within an uplink Frame Protocol data frame prior to forwarding it to the RNC • The RNC extracts the Authentication and Ciphering Response message and encapsulates it within a RANAP Direct Transfer message prior to forwarding it to the PS core Direct Transfer: Authentication and Ciphering Response Direct Transfer: Authentication and Ciphering RequestDownlink Direct Transfer: Authentication and Ciphering Request (DCH) SCCP: Connection Confirm RRC Connection Request (RACH) RRC Connection Setup (FACH) RRC Connection Setup Complete (DCH) Initial Direct Transfer: GPRS Attach Request (DCH) UE RNC SGSNNode B Initial UE message : GPRS Attach Request SCCP: Connection Request
Security Mode Command RANAP: Security Mode Command • The PS core sends a Security Mode Command message to the UE • The purpose of this procedure is to trigger the start or stop of ciphering or to command the restart of the ciphering with a new ciphering configuration, for the radio bearers of one core network domain and for all signalling bearers • It is also used to start integrity protection or to modify the integrity protection configuration for all signalling radio bearers Security Mode Command (DCH) UE RNC SGSNNode B Uplink Direct Transfer: Authenication and Ciphering Response (DCH) Direct Transfer: Authentication and Ciphering Response Direct Transfer: Authentication and Ciphering RequestDownlink Direct Transfer: Authentication and Ciphering Request (DCH) SCCP: Connection Confirm RRC Connection Request (RACH) RRC Connection Setup (FACH) RRC Connection Setup Complete (DCH) Initial Direct Transfer: GPRS Attach Request (DCH) Initial UE message : GPRS Attach Request SCCP: Connection Request
Security Mode Complete UE RNC SGSNNode B Secuirty Mode Complete (DCH) • The UE responds to the Security Mode Command message with a Security Mode Complete message Security Mode CommandSecurity Mode Command (DCH) Uplink Direct Transfer: Authenication and Ciphering Response (DCH) Direct Transfer: Authentication and Ciphering Response Direct Transfer: Authentication and Ciphering RequestDownlink Direct Transfer: Authentication and Ciphering Request (DCH) SCCP: Connection Confirm RRC Connection Request (RACH) RRC Connection Setup (FACH) RRC Connection Setup Complete (DCH) Initial Direct Transfer: GPRS Attach Request (DCH) Initial UE message : GPRS Attach Request SCCP: Connection Request
Common Id • The purpose of the Common ID procedure is to inform the RNC about the permanent NAS UE Identity (i.e. IMSI) of a user • This is used by the RNC e.g. to create a reference between the permanent NAS UE identity of the user and the RRC connection of that user for UTRAN paging co-ordination UE RNC SGSNNode B Secuirty Mode Complete (DCH) Security Mode CommandSecurity Mode Command (DCH) Uplink Direct Transfer: Authenication and Ciphering Response (DCH) Direct Transfer: Authentication and Ciphering Response Direct Transfer: Authentication and Ciphering RequestDownlink Direct Transfer: Authentication and Ciphering Request (DCH) SCCP: Connection Confirm RRC Connection Request (RACH) RRC Connection Setup (FACH) RRC Connection Setup Complete (DCH) Initial Direct Transfer: GPRS Attach Request (DCH) Initial UE message : GPRS Attach Request SCCP: Connection Request Common ID
Identity Request • The PS core may request the UE to provide its identity. This is done using the Identity Request message • The PS core sends the Identity Request message encapsulated within a RANAP: Direct Transfer message • The RNC sends the Identity Request message encapsulated within a RRC: Downlink Direct Transfer message Direct Transfer: Identity RequestDownlink Direct Transfer: Identity Request (DCH) UE RNC SGSNNode B Secuirty Mode Complete (DCH) Security Mode CommandSecurity Mode Command (DCH) Uplink Direct Transfer: Authenication and Ciphering Response (DCH) Direct Transfer: Authentication and Ciphering Response Direct Transfer: Authentication and Ciphering RequestDownlink Direct Transfer: Authentication and Ciphering Request (DCH) SCCP: Connection Confirm RRC Connection Request (RACH) RRC Connection Setup (FACH) RRC Connection Setup Complete (DCH) Initial Direct Transfer: GPRS Attach Request (DCH) Initial UE message : GPRS Attach Request SCCP: Connection Request Common ID
Identity Response Uplink Direct Transfer: Identity Response (DCH) • The UE sends the Identity Response message encapsulated within a RRC: Uplink Direct Transfer message • The RNC sends the Identity Response message encapsulated within a RANAP: Direct Transfer message Direct Transfer: Identity RequestDownlink Direct Transfer: Common ID (DCH) UE RNC SGSNNode B Secuirty Mode Complete (DCH) Security Mode CommandSecurity Mode Command (DCH) Uplink Direct Transfer: Authenication and Ciphering Response (DCH) Direct Transfer: Authentication and Ciphering Response Direct Transfer: Authentication and Ciphering RequestDownlink Direct Transfer: Authentication and Ciphering Request (DCH) SCCP: Connection Confirm RRC Connection Request (RACH) RRC Connection Setup (FACH) RRC Connection Setup Complete (DCH) Initial Direct Transfer: GPRS Attach Request (DCH) Initial UE message : GPRS Attach Request SCCP: Connection Request Common ID Direct Transfer: Identity Response
Attach Accept • The PS core responds to the Attach Request with a Attach Accept message • The Attach Accept is sent to the RNC encapsulated within a RANAP: Direct Transfer message • The RNC extracts the Attach Accept message and encapsulates it within an RRC: Downlink Direct Transfer message Direct Transfer: Attach Accept Uplink Direct Transfer: Identity Response (DCH) Direct Transfer: Identity RequestDownlink Direct Transfer: Common ID (DCH) UE RNC SGSNNode B Secuirty Mode Complete (DCH) Security Mode CommandSecurity Mode Command (DCH) Uplink Direct Transfer: Authenication and Ciphering Response (DCH) Direct Transfer: Authentication and Ciphering Response Direct Transfer: Authentication and Ciphering RequestDownlink Direct Transfer: Authentication and Ciphering Request (DCH) SCCP: Connection Confirm RRC Connection Request (RACH) RRC Connection Setup (FACH) RRC Connection Setup Complete (DCH) Initial Direct Transfer: GPRS Attach Request (DCH) Initial UE message : GPRS Attach Request SCCP: Connection Request Common ID Direct Transfer: Identity Response Downlink Direct Transfer: Location Attach Accept (DCH)
Attach Complete • The UE core responds to the Attach Accept with a Attach Complete message in case there is new P-TMSI allocated by the SGSN (sent in Attach Accept) • The RNC extracts the Attach Complete message and encapsulates it within a RANAP: Direct Transfer message • The Attach Complete is sent to the RNC encapsulated within RRC: Uplink Direct Transfer message Direct Transfer: Attach Accept Uplink Direct Transfer: Identity Response (DCH) Direct Transfer: Identity RequestDownlink Direct Transfer: Common ID (DCH) UE RNC SGSNNode B Secuirty Mode Complete (DCH) Security Mode CommandSecurity Mode Command (DCH) Uplink Direct Transfer: Authenication and Ciphering Response (DCH) Direct Transfer: Authentication and Ciphering Response Direct Transfer: Authentication and Ciphering RequestDownlink Direct Transfer: Authentication and Ciphering Request (DCH) SCCP: Connection Confirm RRC Connection Request (RACH) RRC Connection Setup (FACH) RRC Connection Setup Complete (DCH) Initial Direct Transfer: GPRS Attach Request (DCH) Initial UE message : GPRS Attach Request SCCP: Connection Request Common ID Direct Transfer: Identity Response Downlink Direct Transfer: Location Attach Accept (DCH) Direct Transfer: Attach CompleteUplink Direct Transfer: Attach Complete (DCH)
Summary of GPRS Attach RRC Connection Setup Complete (DCH) FP: Downlink Sync FP: Uplink Sync NBAP: Synchronisation Indication RRC: RRC Connection Setup (FACH) NBAP: Radio Link Setup Request NBAP: Radio Link Setup Response ALCAP: Establish Request ALCAP: Establish Confirm Direct Transfer: Attach Accept Uplink Direct Transfer: Identity Response (DCH) Direct Transfer: Identity RequestDownlink Direct Transfer: Common ID (DCH) UE RNC SGSNNode B Secuirty Mode Complete (DCH) Security Mode CommandSecurity Mode Command (DCH) Uplink Direct Transfer: Authenication and Ciphering Response (DCH) Direct Transfer: Authentication and Ciphering Response Direct Transfer: Authentication and Ciphering RequestDownlink Direct Transfer: Authentication and Ciphering Request (DCH) SCCP: Connection Confirm Initial Direct Transfer: GPRS Attach Request (DCH) Initial UE message : GPRS Attach Request SCCP: Connection Request Common ID Direct Transfer: Identity Response Downlink Direct Transfer: Location Attach Accept (DCH) Direct Transfer: Attach CompleteUplink Direct Transfer: Attach Complete (DCH) L1 Synchronisation RRC Connection Request (RACH)
PS Call UE is powered up Read BCCH Cell selection Register with core network Cell State Transitions Radio frame synchronisation Cell search Originating PS Call • The PS call can be either mobile originated or mobile terminated • The following slides present a mobile originated call • The first step is to establish an RRC connection, however if the follow on“ request is SET in NAS Message GPRS” – ‘ Attach Request -> there is no Iu release as’ CN is waiting for additional signalling using the same RRC (e.g. PDP context Activation) • This means that RRC Connections for PS calls are initiated with cause : registration
ActivatePDPContext Request UE RNC SGSNNode B Uplink Direct Transfer : Activate PDP context request (DCH) • Having attached with the PS Core NW, UE sends Activate PDP context request DCCH ->DCH -> DPCH • By sending this message UE requests a service for the packet switched connection establishment • DCCH contains the RRC: Uplink Direct Transfer message • Message is sent using acknowledged mode RLC Direct Transfer : Activate PDP context request GPRS Attach
NAS– Message: ActivatePDPContext Request IEI Information Element Type/Reference Presence Format Length Protocol discriminator Protocol discriminator 10.2 M V 1/2 Transaction identifier Transaction identifier 10.3.2 M V 1/2– 3/2 Activate PDP context request message identity Message type 10.4 M V 1 Requested NSAPI Network service access point identifier 10.5.6.2 M V 1 Requested LLC SAPI LLC service access point identifier 10.5.6.9 M V 1 Requested QoS Quality of service 10.5.6.5 M LV 12 Requested PDP address Packet data protocol address 10.5.6.4 M LV 3 - 19 28 Access point name Access point name 10.5.6.1 O TLV 3 - 102 27 Protocol configuration options Protocol configuration options 10.5.6.3 O TLV 3 - 253
RAB Assignment Request UE RNC SGSNNode B Uplink Direct Transfer : Activate PDP context request (DCH) Direct Transfer : Activate PDP context request RAB Assignment Request • Having received the Activate PDP Context Request message the PS core sends the RANAP: RAB Assignment Resuest message to the RNC • The RANAP: RAB Assignment Resuest message requests the RNC to establish a RAB with a specified set of QoS parameters • The PS core requests these QoS parameters based upon the subscription and the service being requested (as seen from Activate PDP Context Request message the QoS is based entirely on the subscription) GPRS Attach
Radio Bearer Setup UE RNC SGSNNode B Uplink Direct Transfer : Activate PDP context request (DCH) Direct Transfer : Activate PDP context request RANAP: RAB Assignment Request RRC: Radio Bearer Setup • Once the RANAP: RAB Assignment Request message has been received from PS CN and RNC has resources to setup the RB the RNC sends a RRC: Radio Bearer Setup message to the UE GPRS Attach
Example: RB Setup for UL: 64 DL: 64 PSconnection Higher layer RAB/Signalling RB RAB RLC Logical channel type DTCH RLC mode AM Payload sizes, bit 320 Max data rate, bps 64 000 AMD PDU header, bit 16 MAC MAC header, bit 0 MAC multiplexing N/A Layer 1 TrCH type DCH TB sizes, bit 336 TFS TF0, bits 0x336 TF1, bits 1x336 TF2, bits 2x336 TF3, bits 3x336 TF4, bits 4x336 TTI, ms 20 Coding type TC CRC, bit 16 Max number of bits/TTI after channel coding 4 236 Uplink: Max number of bits/radio frame before rate matching 2 118 RM attribute 130 to 170
Radio Bearer Setup Complete UE RNC SGSNNode B Uplink Direct Transfer : Activate PDP context request (DCH) Direct Transfer : Activate PDP context request RANAP: RAB Assignment Request RRC: Radio Bearer Setup Radio Bearer Setup Complete • The UE acknowledges the RRC: Radio Bearer Setup message with a RRC: Radio Bearer Setup Complete message GPRS Attach
RAB Assignment Response UE RNC SGSNNode B Uplink Direct Transfer : Activate PDP context request (DCH) Direct Transfer : Activate PDP context request RANAP: RAB Assignment Request RRC: Radio Bearer Setup Radio Bearer Setup Complete • Once the radio bearer establishment has been acknowledged, the RNC indicates to the PS core that the RAB has been established using the RANAP: RAB Assignment Response message RAB Assignment Response GPRS Attach
Measurement Control UE RNC SGSNNode B Uplink Direct Transfer : Activate PDP context request (DCH) Direct Transfer : Activate PDP context request RANAP: RAB Assignment Request RRC: Radio Bearer Setup Radio Bearer Setup Complete RAB Assignment Response Measurement Control • Once the RAB has been established the RNC sends a measurement control messages •For traffic volume measurements (UE internal) •For intra and inter frequency measurements • Prior to receiving this message, the UE uses the measurement control information from the SIBs (inter and intra freq. Measurements traffic volume measurements are not– performed prior to measurement control) • Measurement control defines the reporting thresholds for Measurement Control GPRS Attach
ActivatePDPContext Accept UE RNC SGSNNode B Uplink Direct Transfer : Activate PDP context request (DCH) Direct Transfer : Activate PDP context request RANAP: RAB Assignment Request RRC: Radio Bearer Setup Radio Bearer Setup Complete • Once the radio access bearer establishment has been acknowledged, (measurement control messages can be sent before or after the Activate PDP Context Accept) the PS CN indicates to the UE that the PDP Context Ativation has been successfully established using the RANAP: Activate PDP Context Accept message • RNC receives the Direct Transfer : Activate PDP Context Accept message and forwards it as Downlink Direct Transfer : Activate PDP Context Accept message to the UE RAB Assignment Response Direct Transfer: Activate PDP Context AcceptDownlink Direct Transfer : Activate PDP Context Accept (DCH) Measurement Control Measurement Control GPRS Attach
64kbpsUL & DL Connection Established UE RNC SGSNNode B Uplink Direct Transfer : Activate PDP context request (DCH) Direct Transfer : Activate PDP context request RANAP: RAB Assignment Request RRC: Radio Bearer Setup Radio Bearer Setup Complete • UL: 64 DL: 64 kbps PS data call Established RAB Assignment Response Direct Transfer: Activate PDP Context AcceptDownlink Direct Transfer : Activate PDP Context Accept (DCH) Call Established Measurement Control Measurement Control GPRS Attach
Measurement Reporting
Reporting Event 4a UE RNC SGSNNode B Uplink Direct Transfer : Activate PDP context request (DCH) Direct Transfer : Activate PDP context request RANAP: RAB Assignment Request RRC: Radio Bearer Setup Radio Bearer Setup Complete RAB Assignment Response Direct Transfer: Activate PDP Context AcceptDownlink Direct Transfer : Activate PDP Context Accept (DCH) Packet Call Established Measurement Control Measurement Control Measurement Report : e4a • Once the UE determines that an event 4a has occurred it sends a measurement report to the RNC. This is done using the RRC: Measurement Report message • As instructed, the UE sends measurement report when the RLC buffer absolute payload exceeds the threshold • The measurement identity reflects that provided within the measurement control message GPRS Attach
Radio Link Reconfigure Prepare UE RNC SGSNNode B • Assuming that the admission control procedure within the RNC decides to accept the capacity request from UE, the RNC prepares to reconfigure the radio link at the Node B by sending the NBAP: Radio Link Reconfigure Prepare message NBAP: Radio Link Reconfigure Prepare Uplink Direct Transfer : Activate PDP context request (DCH) Direct Transfer : Activate PDP context request RANAP: RAB Assignment Request RRC: Radio Bearer Setup Radio Bearer Setup Complete RAB Assignment Response Direct Transfer: Activate PDP Context AcceptDownlink Direct Transfer : Activate PDP Context Accept (DCH) Call Established Measurement Control Measurement Control Measurement Report : e4a GPRS Attach
Radio Link Reconfigure Ready Radio Link Reconfigure Ready • The Node B responds to the NBAP: Radio Link Reconfigure Prepare message with a NBAP: Radio Link Reconfigure Ready message UE RNC SGSNNode B NBAP: Radio Link Reconfigure Prepare Uplink Direct Transfer : Activate PDP context request (DCH) Direct Transfer : Activate PDP context request RANAP: RAB Assignment Request RRC: Radio Bearer Setup Radio Bearer Setup Complete RAB Assignment Response Direct Transfer: Activate PDP Context AcceptDownlink Direct Transfer : Activate PDP Context Accept (DCH) Call Established Measurement Control Measurement Control Measurement Report : e4a GPRS Attach
AAL2SIG:ECF AAL2SIG:ERQ Radio Link Reconfigure Ready UE RNC SGSNNode B NBAP: Radio Link Reconfigure Prepare Uplink Direct Transfer : Activate PDP context request (DCH) Direct Transfer : Activate PDP context request RANAP: RAB Assignment Request RRC: Radio Bearer Setup Radio Bearer Setup Complete RAB Assignment Response Direct Transfer: Activate PDP Context AcceptDownlink Direct Transfer : Activate PDP Context Accept (DCH) Call Established Measurement Control Measurement Control Measurement Report : e4a FP: Downlink Sync FP: Uplink Sync Radio Link Reconfiguration Commit Radio Link Reconfiguration Commit • Once the transmission resouce allocations have been configured the RNC sends a NBAP: Radio Link Reconfiguration Commit message to the Node B GPRS Attach
AAL2SIG:ECF AAL2SIG:ERQ Radio Link Reconfigure Ready UE RNC SGSNNode B NBAP: Radio Link Reconfigure Prepare Uplink Direct Transfer : Activate PDP context request (DCH) Direct Transfer : Activate PDP context request RANAP: RAB Assignment Request RRC: Radio Bearer Setup Radio Bearer Setup Complete RAB Assignment Response Direct Transfer: Activate PDP Context AcceptDownlink Direct Transfer : Activate PDP Context Accept (DCH) Call Established Measurement Control Measurement Control Measurement Report : e4a FP: Downlink Sync FP: Uplink Sync Radio Link Reconfiguration Commit Radio Bearer Reconfiguration • Once the reconfiguration of radio link at Node-B is done the RNC sends a RRC: RRC: Radio Bearer Reconfiguration message to UE RRC: Radio Bearer Reconfiguration (DCH) GPRS Attach
AAL2SIG:ECF AAL2SIG:ERQ Radio Link Reconfigure Ready UE RNC SGSNNode B NBAP: Radio Link Reconfigure Prepare Uplink Direct Transfer : Activate PDP context request (DCH) Direct Transfer : Activate PDP context request RANAP: RAB Assignment Request RRC: Radio Bearer Setup Radio Bearer Setup Complete RAB Assignment Response Direct Transfer: Activate PDP Context AcceptDownlink Direct Transfer : Activate PDP Context Accept (DCH) Call Established Measurement Control Measurement Control Measurement Report : e4a FP: Downlink Sync FP: Uplink Sync Radio Link Reconfiguration Commit Radio Bearer Reconfiguration Complete • The UE acknowledges the RRC: Radio Bearer Reconfiguration message with a RRC: Radio Bearer Reconfiguration Complete message RRC: Radio Bearer Reconfiguration (DCH) RRC: Radio Bearer Reconfiguration Complete (DCH) GPRS Attach
AAL2SIG:ECF AAL2SIG:ERQ Radio Link Reconfigure Ready UE RNC SGSNNode B NBAP: Radio Link Reconfigure Prepare Uplink Direct Transfer : Activate PDP context request (DCH) Direct Transfer : Activate PDP context request RANAP: RAB Assignment Request RRC: Radio Bearer Setup Radio Bearer Setup Complete RAB Assignment Response Direct Transfer: Activate PDP Context AcceptDownlink Direct Transfer : Activate PDP Context Accept (DCH) Call Established Measurement Control Measurement Control Measurement Report : e4a FP: Downlink Sync FP: Uplink Sync Radio Link Reconfiguration Commit UL: 64kbps DL: 128/384 kbps Connection Established RRC: Radio Bearer Reconfiguration (DCH) RRC: Radio Bearer Reconfiguration Complete (DCH) GPRS Attach
Cell State Transitions • When the RNC notices that there is nothing being transmitted between UE and RNC, inactivity timers will start to run and in case of expiry of those timers the UE is moved to use common channels i.e. cell state transition from Cell_DCH to Cell_FACH occurs • In order to save some UE battery power (as in Cell_FACH the UE has to read FACH channel all the time) in case of further in activity i.e. no capacity requests from UE nor RNC the UE is further moved to Cell_PCH where the UE only listens PCH (paging channel) UE is powered up Read BCCH Cell selection Register with core network Cell State Transitions Radio frame synchronisation Cell search Originating PS Call
AAL2SIG:ECF AAL2SIG:ERQ Radio Link Reconfigure Ready UE RNC SGSNNode B NBAP: Radio Link Reconfigure Prepare Call Established Measurement Report : e4a FP: Downlink Sync FP: Uplink Sync Radio Link Reconfiguration Commit Radio Bearer Reconfiguration RRC: Radio Bearer Reconfiguration (DCH) RRC: Radio Bearer Reconfiguration Complete (DCH) Measurement Control RRC: Radio Bearer Reconfiguration (DCH) Data Flow • In case the RNC decides to move the UE to Cell_FACH state it sends RRC: Radio Bearer Reconfiguration GPRS Attach
Radio Bearer Reconfiguration Complete • The UE acknowledges the RRC: Radio Bearer Reconfiguration message with a RRC: Radio Bearer Reconfiguration Complete message on RACH AAL2SIG:ECF AAL2SIG:ERQ Radio Link Reconfigure Ready UE RNC SGSNNode B NBAP: Radio Link Reconfigure Prepare Call Established Measurement Report : e4a FP: Downlink Sync FP: Uplink Sync Radio Link Reconfiguration Commit RRC: Radio Bearer Reconfiguration (DCH) RRC: Radio Bearer Reconfiguration Complete (DCH) Measurement Control RRC: Radio Bearer Reconfiguration (DCH) Data Flow RRC: Radio Bearer Reconfiguration Complete (RACH) GPRS Attach
Measurement Control • RNC sends RRC: Measurement Control message to the UE to setup the UE traffic volume measurements for the UE capacity requests (e4a) Measurement Control (FACH) AAL2SIG:ECF AAL2SIG:ERQ Radio Link Reconfigure Ready UE RNC SGSNNode B NBAP: Radio Link Reconfigure Prepare Call Established Measurement Report : e4a FP: Downlink Sync FP: Uplink Sync Radio Link Reconfiguration Commit RRC: Radio Bearer Reconfiguration (DCH) RRC: Radio Bearer Reconfiguration Complete (DCH) Measurement Control RRC: Radio Bearer Reconfiguration (DCH) Data Flow RRC: Radio Bearer Reconfiguration Complete (RACH) GPRS Attach
Radio Link Deletion Request • RNC sends NBAP: Radio Link Deletion Request message to the BTS to delete the dedicated resources from the BTS for the UE moved to the Cell_FACH Measurement Control (FACH) AAL2SIG:ECF AAL2SIG:ERQ Radio Link Reconfigure Ready UE RNC SGSNNode B NBAP: Radio Link Reconfigure Prepare Call Established Measurement Report : e4a FP: Downlink Sync FP: Uplink Sync Radio Link Reconfiguration Commit RRC: Radio Bearer Reconfiguration (DCH) RRC: Radio Bearer Reconfiguration Complete (DCH) Measurement Control RRC: Radio Bearer Reconfiguration (DCH) Data Flow RRC: Radio Bearer Reconfiguration Complete (RACH) NBAP: Radio Link Deletion Request GPRS Attach
Radio Link Deletion Response Measurement Control (FACH) AAL2SIG:ECF AAL2SIG:ERQ Radio Link Reconfigure Ready UE RNC SGSNNode B NBAP: Radio Link Reconfigure Prepare Call Established Measurement Report : e4a FP: Downlink Sync FP: Uplink Sync Radio Link Reconfiguration Commit RRC: Radio Bearer Reconfiguration (DCH) RRC: Radio Bearer Reconfiguration Complete (DCH) Measurement Control RRC: Radio Bearer Reconfiguration (DCH) Data Flow RRC: Radio Bearer Reconfiguration Complete (RACH) NBAP: Radio Link Deletion Response NBAP: Radio Link Deletion Request GPRS Attach
UE in Cell_FACH Measurement Control (FACH) AAL2SIG:ECF AAL2SIG:ERQ Radio Link Reconfigure Ready UE RNC SGSNNode B NBAP: Radio Link Reconfigure Prepare GPRS Attach Call Established Measurement Report : e4a FP: Downlink Sync FP: Uplink Sync Radio Link Reconfiguration Commit RRC: Radio Bearer Reconfiguration (DCH) RRC: Radio Bearer Reconfiguration Complete (DCH) Measurement Control RRC: Radio Bearer Reconfiguration (DCH) Data Flow RRC: Radio Bearer Reconfiguration Complete (RACH) NBAP: Radio Link Deletion Response NBAP: Radio Link Deletion Request ALCAP: Release Request ALCAP: Release Confirm UE in Cell_FACH, PDP Context Active and GPRS Attached
Physical Channel Reconfiguration Measurement Control (FACH) UE RNC SGSNNode B GPRS Attach Call Established RRC: Radio Bearer Reconfiguration (DCH) Data Flow RRC: Radio Bearer Reconfiguration Complete (RACH) NBAP: Radio Link Deletion Response NBAP: Radio Link Deletion Request ALCAP: Release Request ALCAP: Release Confirm UE in Cell_FACH, PDP Context Active and GPRS Attached RRC: Physical Channel Reconfiguration (FACH) RRC: Physical Channel Reconfiguration Complete (RACH) • RNC sends RRC: Physical Channel Reconfiguration message to the UE to move the UE to Cell_PCH state
UE in Cell_PCH Measurement Control (FACH) UE RNC SGSNNode B GPRS Attach Call Established RRC: Radio Bearer Reconfiguration (DCH) Data Flow RRC: Radio Bearer Reconfiguration Complete (RACH) NBAP: Radio Link Deletion Response NBAP: Radio Link Deletion Request ALCAP: Release Request ALCAP: Release Confirm UE in Cell_FACH, PDP Context Active and GPRS Attached RRC: Physical Channel Reconfiguration (FACH) RRC: Physical Channel Reconfiguration Complete (RACH) UE in Cell_PCH, PDP Context Active and GPRS Attached
Cell Update Measurement Control (FACH) UE RNC SGSNNode B GPRS Attach Call Established RRC: Radio Bearer Reconfiguration (DCH) Data Flow RRC: Radio Bearer Reconfiguration Complete (RACH) NBAP: Radio Link Deletion Response NBAP: Radio Link Deletion Request ALCAP: Release Request ALCAP: Release Confirm UE in Cell_FACH, PDP Context Active and GPRS Attached RRC: Physical Channel Reconfiguration (FACH) RRC: Physical Channel Reconfiguration Complete (RACH) UE in Cell_PCH, PDP Context Active and GPRS Attached RRC: Cell Update (RACH) • In case the UE has something to send it has to send RRC: Cell Update message to the RNC to move the UE to Cell_FACH state to get dedicated resources
Cell Update Confirm Measurement Control (FACH) UE RNC SGSNNode B GPRS Attach Call Established RRC: Radio Bearer Reconfiguration (DCH) Data Flow RRC: Radio Bearer Reconfiguration Complete (RACH) NBAP: Radio Link Deletion Response NBAP: Radio Link Deletion Request ALCAP: Release Request ALCAP: Release Confirm UE in Cell_FACH, PDP Context Active and GPRS Attached RRC: Physical Channel Reconfiguration (FACH) RRC: Physical Channel Reconfiguration Complete (RACH) UE in Cell_PCH, PDP Context Active and GPRS Attached RRC: Cell Update (RACH) • RNC acknowledges the UE message RRC: Cell Update with RRC: Cell Update Confirm message and instructs UE to move to Cell_FACH state RRC: Cell Update Confirm (FACH)
Utran Mobility Information Confirm Measurement Control (FACH) UE RNC SGSNNode B GPRS Attach Call Established RRC: Radio Bearer Reconfiguration (DCH) Data Flow RRC: Radio Bearer Reconfiguration Complete (RACH) NBAP: Radio Link Deletion Response NBAP: Radio Link Deletion Request ALCAP: Release Request ALCAP: Release Confirm UE in Cell_FACH, PDP Context Active and GPRS Attached RRC: Physical Channel Reconfiguration (FACH) RRC: Physical Channel Reconfiguration Complete (RACH) UE in Cell_PCH, PDP Context Active and GPRS Attached RRC: Cell Update (RACH) • UE acknowledges the RNC message RRC: Cell Update Confirm and the parameters given to UE in that message with RRC: Utran Mobility Information Confirm message RRC: Cell Update Confirm (FACH) RRC: Utran Mobility Information Confirm (RACH)
Measurement Control Measurement Control (FACH) UE RNC SGSNNode B GPRS Attach Call Established RRC: Radio Bearer Reconfiguration (DCH) Data Flow RRC: Radio Bearer Reconfiguration Complete (RACH) NBAP: Radio Link Deletion Response NBAP: Radio Link Deletion Request ALCAP: Release Request ALCAP: Release Confirm UE in Cell_FACH, PDP Context Active and GPRS Attached RRC: Physical Channel Reconfiguration (FACH) RRC: Physical Channel Reconfiguration Complete (RACH) UE in Cell_PCH, PDP Context Active and GPRS Attached RRC: Cell Update (RACH) • Measurement Control message for Traffic Volume Measurement reporting is sent to UE RRC: Cell Update Confirm (FACH) RRC: Utran Mobility Information Confirm (RACH) RRC: Measurement Control (FACH)
Radio Link Setup & Establishment RequestUE RNC SGSNNode B GPRS Attach Call Established Data Flow UE in Cell_FACH, PDP Context Active and GPRS Attached RRC: Physical Channel Reconfiguration (FACH) RRC: Physical Channel Reconfiguration Complete (RACH) UE in Cell_PCH, PDP Context Active and GPRS Attached RRC: Cell Update (RACH) RRC: Cell Update Confirm (FACH) RRC: Utran Mobility Information Confirm (RACH) RRC: Measurement Control (FACH) AAL2SIG:ECF AAL2SIG:ERQ NBAP: Radio Link Setup Response NBAP: Radio Link Setup Measurement Report : e4a FP: Downlink Sync FP: Uplink Sync As explained earlier: this time just set up 64/64
Radio Bearer Reconfiguration UE RNC SGSNNode B GPRS Attach Call Established Data Flow UE in Cell_FACH, PDP Context Active and GPRS Attached RRC: Physical Channel Reconfiguration (FACH) RRC: Physical Channel Reconfiguration Complete (RACH) UE in Cell_PCH, PDP Context Active and GPRS Attached RRC: Cell Update (RACH) RRC: Cell Update Confirm (FACH) RRC: Utran Mobility Information Confirm (RACH) RRC: Measurement Control (FACH) AAL2SIG:ECF AAL2SIG:ERQ NBAP: Radio Link Setup Response NBAP: Radio Link Setup Measurement Report : e4a FP: Downlink Sync FP: Uplink Sync RRC: Radio Bearer Reconfiguration (DCH) As explained earlier: this time just set up 64/64
UE RNC SGSNNode B GPRS Attach Call Established Data Flow UE in Cell_FACH, PDP Context Active and GPRS Attached RRC: Physical Channel Reconfiguration (FACH) RRC: Physical Channel Reconfiguration Complete (RACH) UE in Cell_PCH, PDP Context Active and GPRS Attached RRC: Cell Update (RACH) RRC: Cell Update Confirm (FACH) RRC: Utran Mobility Information Confirm (RACH) RRC: Measurement Control (FACH) AAL2SIG:ECF AAL2SIG:ERQ NBAP: Radio Link Setup Response NBAP: Radio Link Setup Measurement Report : e4a FP: Downlink Sync FP: Uplink Sync NBAP: Synchronisation Indication RRC: Radio Bearer Reconfiguration (FACH) • The UE acknowledges the RRC: Radio Bearer Reconfiguration message with a RRC: Radio Bearer Reconfiguration Complete message RRC: Radio Bearer Reconfiguration Complete (DCH) NBAP: Synchronisation Indication Radio Bearer Reconfiguration Complete
UE RNC SGSNNode B GPRS Attach Call Established Data Flow UE in Cell_FACH, PDP Context Active and GPRS Attached RRC: Physical Channel Reconfiguration (FACH) RRC: Physical Channel Reconfiguration Complete (RACH) UE in Cell_PCH, PDP Context Active and GPRS Attached RRC: Cell Update (RACH) RRC: Cell Update Confirm (FACH) RRC: Utran Mobility Information Confirm (RACH) RRC: Measurement Control (FACH) AAL2SIG:ECF AAL2SIG:ERQ NBAP: Radio Link Setup Response NBAP: Radio Link Setup Measurement Report : e4a FP: Downlink Sync FP: Uplink Sync NBAP: Synchronisation Indication RRC: Radio Bearer Reconfiguration (FACH) • The UE acknowledges the RRC: Radio Bearer Reconfiguration message with a RRC: Radio Bearer Reconfiguration Complete message RRC: Radio Bearer Reconfiguration Complete (DCH) NBAP: Synchronisation Indication Measurement Control Measurement Control Measurement Control Measurement Control for intra- frequency measurements and stopping traffic
UE RNC SGSNNode B GPRS Attach Call Established Data Flow UE in Cell_DCH, PDP Context Active and GPRS Attached Deactivate PDP Context Request UpLink Direct Transfer : Deactivate PDP Context Request (DCH) Direct Transfer : Deactivate PDP Context Request (DCH) • The UE requests deactivation of PDP context by sending the Deactivate PDP Context Request towards the PS core encapsulated within RRC: Uplink Direct Transfer
UE RNC SGSNNode B GPRS Attach Call Established Data Flow UE in Cell_DCH, PDP Context Active and GPRS Attached Deactivate PDP Context Accept UpLink Direct Transfer : Deactivate PDP Context Request (DCH) Direct Transfer : Deactivate PDP Context Request Direct Transfer : Deactivate PDP Context AcceptDownlink Direct Transfer : Deactivate PDP Context Accept (DCH) • The PS CN acknowledges the deactivation of PDP context by sending Deactivate PDP Context Accept to the UE encapsulated within RRC: Downlink Direct Transfer
RAB Assignment Request RANAP: RAB Assignment Request UE RNC SGSNNode B GPRS Attach Call Established Data Flow UE in Cell_DCH, PDP Context Active and GPRS Attached UpLink Direct Transfer : Deactivate PDP Context Request (DCH) Direct Transfer : Deactivate PDP Context Request Direct Transfer : Deactivate PDP Context AcceptDownlink Direct Transfer : Deactivate PDP Context Accept (DCH) • The PS CN sends the RAB modification (release) request to the RNC by RANAP: RAB Assignment Request
RAB Assignment Response RANAP: RAB Assignment Request RANAP: RAB Assignment Response UE RNC SGSNNode B GPRS Attach Call Established Data Flow UE in Cell_DCH, PDP Context Active and GPRS Attached UpLink Direct Transfer : Deactivate PDP Context Request (DCH) Direct Transfer : Deactivate PDP Context Request Direct Transfer : Deactivate PDP Context AcceptDownlink Direct Transfer : Deactivate PDP Context Accept (DCH) • The RNC acknowledges the RAB modification (release) and sends RANAP: RAB Assignment Response to the PS CN
Radio Link Reconfiguration Prepare RANAP: RAB Assignment Request RANAP: RAB Assignment Response UE RNC SGSNNode B GPRS Attach Call Established Data Flow UE in Cell_DCH, PDP Context Active and GPRS Attached UpLink Direct Transfer : Deactivate PDP Context Request (DCH) Direct Transfer : Deactivate PDP Context Request Direct Transfer : Deactivate PDP Context AcceptDownlink Direct Transfer : Deactivate PDP Context Accept (DCH) NBAP: Radio Link Reconfiguration Prepare • The RNC starts RB modifications by sending modification information to the BTS NBAP: Radio Link Reconfiguration Prepare
Radio Link Reconfiguration Ready RANAP: RAB Assignment Request RANAP: RAB Assignment Response UE RNC SGSNNode B GPRS Attach Call Established Data Flow UE in Cell_DCH, PDP Context Active and GPRS Attached UpLink Direct Transfer : Deactivate PDP Context Request (DCH) Direct Transfer : Deactivate PDP Context Request Direct Transfer : Deactivate PDP Context AcceptDownlink Direct Transfer : Deactivate PDP Context Accept (DCH) NBAP: Radio Link Reconfiguration Prepare NBAP: Radio Link Reconfiguration Ready • The BTS acknowledges the RB modifications by sending NBAP: Radio Link Reconfiguration Ready
Radio Link Reconfiguration Commit RANAP: RAB Assignment Request RANAP: RAB Assignment Response UE RNC SGSNNode B GPRS Attach Call Established Data Flow UE in Cell_DCH, PDP Context Active and GPRS Attached UpLink Direct Transfer : Deactivate PDP Context Request (DCH) Direct Transfer : Deactivate PDP Context Request Direct Transfer : Deactivate PDP Context AcceptDownlink Direct Transfer : Deactivate PDP Context Accept (DCH) NBAP: Radio Link Reconfiguration Prepare NBAP: Radio Link Reconfiguration Ready NBAP: Radio Link Reconfiguration Commit • After receiving successful response from BTS the RNC orders BTS to take the modifications into use by sending NBAP: Radio Link Reconfiguration Commit
Radio Bearer Release RANAP: RAB Assignment Request RANAP: RAB Assignment Response UE RNC SGSNNode B GPRS Attach Call Established Data Flow UE in Cell_DCH, PDP Context Active and GPRS Attached UpLink Direct Transfer : Deactivate PDP Context Request (DCH) Direct Transfer : Deactivate PDP Context Request Direct Transfer : Deactivate PDP Context AcceptDownlink Direct Transfer : Deactivate PDP Context Accept (DCH) NBAP: Radio Link Reconfiguration Prepare NBAP: Radio Link Reconfiguration Ready NBAP: Radio Link Reconfiguration Commit RRC: Radio Bearer Release (DCH) • Then the RNC is ready to inform the UE about the changes in the RB by sending RRC: Radio Bearer Release
Radio Bearer Release Complete RANAP: RAB Assignment Request RANAP: RAB Assignment Response UE RNC SGSNNode B GPRS Attach Call Established Data Flow UE in Cell_DCH, PDP Context Active and GPRS Attached UpLink Direct Transfer : Deactivate PDP Context Request (DCH) Direct Transfer : Deactivate PDP Context Request Direct Transfer : Deactivate PDP Context AcceptDownlink Direct Transfer : Deactivate PDP Context Accept (DCH) NBAP: Radio Link Reconfiguration Prepare NBAP: Radio Link Reconfiguration Ready NBAP: Radio Link Reconfiguration Commit RRC: Radio Bearer Release (DCH) • Then the RNC is ready to inform the UE about the changes in the RB by sending RRC: Radio Bearer Release • After this there is only signalling link active between the UE and PS CN and the UE can be moved to Cell_FACH and to Cell_PCH still maintaining the signalling link or the signalling link can be deactivated by doing GPRS detach or by releasing the RRC connection (and RRC: Radio Bearer Release Complete (DCH)
UE GPRS Attached and PDP Deactivated in Cell_PCH (I) • In case the UE is GPRS Attached and in Cell_PCH state the UE needs to send RRC: Cell Update message indicating UL capacity request after that the PDP Context activation procedure as above where the messaging is as explained earlier • Then PDP Context is activated using common channels, RAB and RB setup • UE internal measurements are activated and in case UE has something to send in addition to just activating PDP Context • In case UE sends Measurement Report for event 4a the dedicated resources are setup with radio bearer reconfiguration •This is also reconfiguration from Cell_FACH to Cell_DCH
UE RNC SGSNNode B GPRS Attach Call Established Data Flow UE in Cell_PCH, GPRS Attached RRC : Cell Update (RACH) RRC : Cell Update Confirm (FACH) UpLink Direct Transfer : Activate PDP Context Request (RACH) Direct Transfer : Activate PDP Context Request Direct Transfer : Activate PDP Context AcceptDownlink Direct Transfer : Activate PDP Context Accept (FACH) RRC : Utran Mobility Information Confirm (RACH) RANAP : RAB Assignment Request RANAP : RAB Assignment Response RRC : Radio Bearer Setup (FACH) RRC : Radio Bearer Setup Complete (RACH) RRC : Measurement Control (FACH) RRC : Measurement Control (FACH) RRC : Measurement Report (E4a) (RACH) NBAP : Radio Link Setup NBAP : Radio Link Setup Response RRC: Radio Bearer Reconfiguration (FACH) NBAP : Radio Link Synchronisation RRC: Radio Bearer Reconfiguration Complete (DCH) RRC : Measurement Control (DCH) RRC : Measurement Control (DCH) UE GPRS Attached and PDP Deactivated in Cell_PCH (II)
UE GPRS attached and PDP Deactivated in Idle Mode (I) • In case the UE has deactivated PDP Context and is moved to idle mode (still attached) the UE must initiate RRC Connection Setup procedure before it can request new PDP context activation • The RNC has to re-establish the Iu resources for the UE by CM service request
UE RNC SGSNNode B GPRS Attach Call Established Data Flow UE in idle, GPRS Attached, PDP Context Deactive RRC : RRC Connection request (RACH) RRC : RRC Connection Setup (FACH) Initial UE Message : GPRS Service Request RRC : RRC Connection Setup Complete (DCH) NBAP : Radio Link Setup NBAP : Radio Link Setup Response NBAP : Radio Link Synchronisation Initial Direct Transfer : GPRS Service Request (DCH) Security Mode Complete (DCH) Security Mode Command RANAP: Direct Transfer : GPRS Activate PDP Context AcceptRRC: Downlink Direct Transfer : GPRS Activate PDP Context Accept (DCH) RANAP: Direct Transfer : GPRS P-TMSI Reallocation CompleteRRC: Uplink Direct Transfer : GPRS P-TMSI Reallocation Complete (DCH) RANAP: RAB Assignment RequestRRC: Radio Bearer Setup (DCH) RRC : Radio Bearer Setup Complete (DCH) RANAP :RAB Assignment Response RRC: Measurement Control (DCH) RRC: Measurement Control (DCH) RRC : Measurement Report (e4a) (DCH) NBAP : Radio Link Reconfiguration Prepare NBAP : Radio Link Reconfiguration Ready NBAP : Radio Link Reconfiguration Commit RRC: Radio Bearer Reconfiguration (DCH) RRC : Radio Bearer Reconfiguration Complete (DCH) RRC: Measurement Control (DCH) UE GPRS Attached and PDP Deactivated in Idle Mode (I) RRC: Uplink Direct Transfer: GPRS Activate PDP Context Request (DCH) RANAP: Direct Transfer: GPRS Activate PDP Context Request RANAP: Direct Transfer : GPRS P-TMSI Reallocation CommandRRC: Downlink Direct Transfer : GPRS P-TMSI Reallocation Command (DCH)

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Ps call flow

  • 1.
    Introduction • This slideset provides a detailed illustration of the message flow observed for an PS call • The message flow is focused upon communication with the packet switched core and does not include communication with the circuit switched core. • The UE starts by searching for candidate cells by correlating the RSSI with the code defining the primary SCH • The UE then achieves radio frame synchronisation and reads the BCCH logical channel • The BCCH provides system information including the cell selection criteria • If the cell passes the cell selection criteria then the UE establishes an RRC connection ad registers with the core network • Having registered the UE activates the PDP context with the CN using the existing CN (assumption is that follow on request pending is set) • In case of no activity (no data nor signalling data transmitted between the UE UE is powered up Read BCCH Cell selection Register with core network Cell State Transitions Radio frame synchronisation Cell search Originating PS Call
  • 2.
    Protocol Stacks • Communicationbetween the UE, RNC and packet core makes use of • Uu interface protocol stack • Iub interface protocol stack • Iu,ps interface protocol stack Iub Iu,ps Uu Node B RNC SGSN
  • 3.
    PS Radio InterfaceControl Plane • The radio interface protocol control plane allows RRC signalling between the RNC and UE • RRC signalling is communicated across the Iub using the Iub user plane protocol stack i.e. using Frame protocol and AAL2 based ATM • Acknowledged or unacknowledged mode RLC is used between the UE and RNC WCDMA L1 RRC WCDMA L1 AAL2 FP ATM Phy MAC RLC-C AAL2 FP ATM Phy MAC RLC-C UE No de B RNC Uu Iub RRC
  • 4.
    PS User Plane •The SGSN provides connectivity to the packet switched core and applications • Acknowledged mode RLC (or unacknowledged) is used between the UE and RNC • AAL2 based ATM is used to transfer user plane data across the Iub and AAL5 based ATM across Iu,ps interface WCDMA L1 WCDMA L1 AAL2 FP ATM Phy MAC RLC-U AAL2 FP ATM Phy MAC RLC-U AAL5 ATM Phy GTP-U AAL5 ATM Phy UE No de B RNC SGSN Uu Iub Iu,ps UDP IP GTP-U UDP IP
  • 5.
    Cell Search • TheUE keeps a record of the previously used carrier. The cell search procedure starts by scanning this carrier • The cell search procedure is completed by correlating RSSI against the known Primary SCH code • Peaks in the correlation result indicate the presence of a cell as well as the multipath associated with the propagation channel to that cell Correlation Peaks time Correlation result • Once the UE has identified a cell the UE attempts to synchronise with that cell UE is powered up Read BCCH Cell selection Register with core network Cell State Transitions Radio frame synchronisation Cell search Originating PS Call
  • 6.
    Radio Frame Synchronisation CpCp Cp Cs1 Cs1Cs2 Primary SCH Secondary SCH Primary CCPCH 256 chips 2560 - 256 chips Slot 1 Slot 2 Slot 15 Slot 1 • The UE completes the three step radio frame synchronisation process • Step 1: Primary SCH identification and slot synchronisation (completed during cell search) • Step 2: Code group identification and frame synchronisation using the Secondary SCH • Step 3: Scrambling code identification using the CPICH • Having completed these three steps the UE is able to decode the Primary CCPCH -> BCH -> BCCH Primary CPICH UE is powered up Read BCCH Cell selection Register with core network Cell State Transitions Radio frame synchronisation Cell search Originating PS Call
  • 7.
    Read BCCH • TheBCCH encapsulates the System Information message which includes the Master Information Block (MIB), Scheduling Blocks (SB) and System Information Blocks (SIB) UE is powered up Read BCCH Cell selection Register with core network Cell State Transitions Radio frame synchronisation Cell search Originating PS Call
  • 8.
    Cell Selection • Cellselection is standardised by 3GPP within TS 25.304 • Cell selection is based upon the S-criteria • UE extracts the S-criteria parameters from SIB 3 • QqualMin • QrxlevMin • UE_TXPWR_MAX_RACH UE is powered up Read BCCH Cell selection Register with core network Cell State Transitions Radio frame synchronisation Cell search Originating PS Call
  • 9.
    Register with theCore Network • The UE registers with the PS core domain (the UE also registers with the CS core domain but this slide set concerns only the PS domain) • PS domain registering is a GPRS attach procedure • Registering is achieved by establishing an RRC connection and sending non-access stratum messages to the 3G SGSN • RRC Connection Establishment • GPRS Attach UE is powered up Read BCCH Cell selection Register with core network Cell State Transitions Radio frame synchronisation Cell search Originating PS Call
  • 10.
    UTRAN Specific SignallingProtocols 3G-MSC/VLR 3G-SGSN UE Node B RNC RNC RNS RNS RRC Iur: RNSAP Iu-PS: RANAP Iu-CS: RANAP Iub: NBAP
  • 11.
    RRC: RRC ConnectionRequest (RACH) UE RNC Node B • If the cell from which the BCCH has been read is suitable to camp upon then the UE follows the instructions in SIB1 to complete a GPRS attach with the PS core network • UE must first establish an RRC connection • The RRC Connection Request message is sent to the RNC using unacknowledged mode RLC on the RACH • The message is sent via the Node B which uses Frame Protocol to encapsulate the transport blocks and send them across the Iub via AAL2 based ATM RRC Connection Request
  • 12.
    • The RNCreplies to the UE s original’ RRC Connection Request message with an RRC Connection Setup message • The RRC Connection Setup message is sent to the UE on the FACH using unacknowledged mode RLC RRC: RRC Connection Request (RACH) UE RNC Node B NBAP: Radio Link Setup Request NBAP: Radio Link Setup Response ALCAP: Establish Request RRC Connection Setup ALCAP: Establish Confirm FP: Downlink Sync FP: Uplink Sync RRC: RRC Connection Setup (FACH)
  • 13.
    • UE transmitsthe RRC Connection Setup Complete message using SRB 2 on the newly established DCH RRC: RRC Connection Request (RACH) UE RNC Node B NBAP: Radio Link Setup Request NBAP: Radio Link Setup Response ALCAP: Establish Request RRC Connection Setup Complete ALCAP: Establish Confirm FP: Downlink Sync FP: Uplink Sync NBAP: Synchronisation Indication RRC: RRC Connection Setup (FACH) L1 Synchronisation RRC: RRC Connection Setup Complete (DCH)
  • 14.
    GPRS Attach Request RRCConnection Request (RACH) RRC Connection Setup (FACH) RRC Connection Setup Complete (DCH) Initial Direct Transfer: GPRS Attach Request (DCH) UE RNC SGSNNode B • The UE has now established a dedicated communication link with UTRAN and is in a position to send a message to the core network (PS core in this case) • The UE uses an uplink RRC: Initial Direct Transfer message to encapsulate and send a GPRS MM : Attach Request message to the RNC • The Node B extracts the RRC: Initial Direct Transfer message and encapsulates it within a DCH Frame Protocol frame • The RNC extracts the Attach Request message and encapsulates it within a RANAP: Initial UE Message message prior to forwarding it to the SGSN Initial UE message : GPRS Attach Request SCCP: Connection Request • The RANAP: Initial UE Message message is accompanied with a SCCP: Connection Request message which is used to establish the Iu-PS connection
  • 15.
    Connection Confirm SCCP: ConnectionConfirm • The SCCP layer of the Iu-PS protocol stack responds to the Connection Request message with a Connection Confirm message • The link is specified as being connection orientated RRC Connection Request (RACH) RRC Connection Setup (FACH) RRC Connection Setup Complete (DCH) Initial Direct Transfer: GPRS Attach Request (DCH) UE RNC SGSNNode B Initial UE message : GPRS Attach Request SCCP: Connection Request
  • 16.
    Direct Transfer: Authenticationand Ciphering Request Authentication and Ciphering Request • Having received the Attach Request message the PS core responds with an Authentication and Ciphering Request message • The Authentication and Ciphering Request message is sent to the RNC encapsulated within a RANAP Direct Transfer message • The RNC extracts the Authentication and Ciphering Request message and encapsulates it within an RRC Downlink Direct Transfer message • The RNC then encapsulates the RRC Downlink Direct Transfer message within a downlink Frame Protocol data frame prior to forwarding it to the Node B • The Node B extracts the RRC Downlink Direct Transfer message and forwards it to the UE Downlink Direct Transfer: Authentication and Ciphering Request (DCH) SCCP: Connection Confirm RRC Connection Request (RACH) RRC Connection Setup (FACH) RRC Connection Setup Complete (DCH) Initial Direct Transfer: GPRS Attach Request (DCH) UE RNC SGSNNode B Initial UE message : GPRS Attach Request SCCP: Connection Request
  • 17.
    Authentication and Ciphering Response UplinkDirect Transfer: Authenication and Ciphering Response (DCH) • Having received the Authentication and Ciphering Request message the UE responds with an Authentication and Ciphering Response message • The Authentication and Ciphering Response message is sent to the Node B encapsulated within an RRC Uplink Direct Transfer message • The Node B encapsulates the RRC Uplink Direct Transfer message within an uplink Frame Protocol data frame prior to forwarding it to the RNC • The RNC extracts the Authentication and Ciphering Response message and encapsulates it within a RANAP Direct Transfer message prior to forwarding it to the PS core Direct Transfer: Authentication and Ciphering Response Direct Transfer: Authentication and Ciphering RequestDownlink Direct Transfer: Authentication and Ciphering Request (DCH) SCCP: Connection Confirm RRC Connection Request (RACH) RRC Connection Setup (FACH) RRC Connection Setup Complete (DCH) Initial Direct Transfer: GPRS Attach Request (DCH) UE RNC SGSNNode B Initial UE message : GPRS Attach Request SCCP: Connection Request
  • 18.
    Security Mode Command RANAP:Security Mode Command • The PS core sends a Security Mode Command message to the UE • The purpose of this procedure is to trigger the start or stop of ciphering or to command the restart of the ciphering with a new ciphering configuration, for the radio bearers of one core network domain and for all signalling bearers • It is also used to start integrity protection or to modify the integrity protection configuration for all signalling radio bearers Security Mode Command (DCH) UE RNC SGSNNode B Uplink Direct Transfer: Authenication and Ciphering Response (DCH) Direct Transfer: Authentication and Ciphering Response Direct Transfer: Authentication and Ciphering RequestDownlink Direct Transfer: Authentication and Ciphering Request (DCH) SCCP: Connection Confirm RRC Connection Request (RACH) RRC Connection Setup (FACH) RRC Connection Setup Complete (DCH) Initial Direct Transfer: GPRS Attach Request (DCH) Initial UE message : GPRS Attach Request SCCP: Connection Request
  • 19.
    Security Mode Complete UERNC SGSNNode B Secuirty Mode Complete (DCH) • The UE responds to the Security Mode Command message with a Security Mode Complete message Security Mode CommandSecurity Mode Command (DCH) Uplink Direct Transfer: Authenication and Ciphering Response (DCH) Direct Transfer: Authentication and Ciphering Response Direct Transfer: Authentication and Ciphering RequestDownlink Direct Transfer: Authentication and Ciphering Request (DCH) SCCP: Connection Confirm RRC Connection Request (RACH) RRC Connection Setup (FACH) RRC Connection Setup Complete (DCH) Initial Direct Transfer: GPRS Attach Request (DCH) Initial UE message : GPRS Attach Request SCCP: Connection Request
  • 20.
    Common Id • Thepurpose of the Common ID procedure is to inform the RNC about the permanent NAS UE Identity (i.e. IMSI) of a user • This is used by the RNC e.g. to create a reference between the permanent NAS UE identity of the user and the RRC connection of that user for UTRAN paging co-ordination UE RNC SGSNNode B Secuirty Mode Complete (DCH) Security Mode CommandSecurity Mode Command (DCH) Uplink Direct Transfer: Authenication and Ciphering Response (DCH) Direct Transfer: Authentication and Ciphering Response Direct Transfer: Authentication and Ciphering RequestDownlink Direct Transfer: Authentication and Ciphering Request (DCH) SCCP: Connection Confirm RRC Connection Request (RACH) RRC Connection Setup (FACH) RRC Connection Setup Complete (DCH) Initial Direct Transfer: GPRS Attach Request (DCH) Initial UE message : GPRS Attach Request SCCP: Connection Request Common ID
  • 21.
    Identity Request • ThePS core may request the UE to provide its identity. This is done using the Identity Request message • The PS core sends the Identity Request message encapsulated within a RANAP: Direct Transfer message • The RNC sends the Identity Request message encapsulated within a RRC: Downlink Direct Transfer message Direct Transfer: Identity RequestDownlink Direct Transfer: Identity Request (DCH) UE RNC SGSNNode B Secuirty Mode Complete (DCH) Security Mode CommandSecurity Mode Command (DCH) Uplink Direct Transfer: Authenication and Ciphering Response (DCH) Direct Transfer: Authentication and Ciphering Response Direct Transfer: Authentication and Ciphering RequestDownlink Direct Transfer: Authentication and Ciphering Request (DCH) SCCP: Connection Confirm RRC Connection Request (RACH) RRC Connection Setup (FACH) RRC Connection Setup Complete (DCH) Initial Direct Transfer: GPRS Attach Request (DCH) Initial UE message : GPRS Attach Request SCCP: Connection Request Common ID
  • 22.
    Identity Response Uplink DirectTransfer: Identity Response (DCH) • The UE sends the Identity Response message encapsulated within a RRC: Uplink Direct Transfer message • The RNC sends the Identity Response message encapsulated within a RANAP: Direct Transfer message Direct Transfer: Identity RequestDownlink Direct Transfer: Common ID (DCH) UE RNC SGSNNode B Secuirty Mode Complete (DCH) Security Mode CommandSecurity Mode Command (DCH) Uplink Direct Transfer: Authenication and Ciphering Response (DCH) Direct Transfer: Authentication and Ciphering Response Direct Transfer: Authentication and Ciphering RequestDownlink Direct Transfer: Authentication and Ciphering Request (DCH) SCCP: Connection Confirm RRC Connection Request (RACH) RRC Connection Setup (FACH) RRC Connection Setup Complete (DCH) Initial Direct Transfer: GPRS Attach Request (DCH) Initial UE message : GPRS Attach Request SCCP: Connection Request Common ID Direct Transfer: Identity Response
  • 23.
    Attach Accept • ThePS core responds to the Attach Request with a Attach Accept message • The Attach Accept is sent to the RNC encapsulated within a RANAP: Direct Transfer message • The RNC extracts the Attach Accept message and encapsulates it within an RRC: Downlink Direct Transfer message Direct Transfer: Attach Accept Uplink Direct Transfer: Identity Response (DCH) Direct Transfer: Identity RequestDownlink Direct Transfer: Common ID (DCH) UE RNC SGSNNode B Secuirty Mode Complete (DCH) Security Mode CommandSecurity Mode Command (DCH) Uplink Direct Transfer: Authenication and Ciphering Response (DCH) Direct Transfer: Authentication and Ciphering Response Direct Transfer: Authentication and Ciphering RequestDownlink Direct Transfer: Authentication and Ciphering Request (DCH) SCCP: Connection Confirm RRC Connection Request (RACH) RRC Connection Setup (FACH) RRC Connection Setup Complete (DCH) Initial Direct Transfer: GPRS Attach Request (DCH) Initial UE message : GPRS Attach Request SCCP: Connection Request Common ID Direct Transfer: Identity Response Downlink Direct Transfer: Location Attach Accept (DCH)
  • 24.
    Attach Complete • TheUE core responds to the Attach Accept with a Attach Complete message in case there is new P-TMSI allocated by the SGSN (sent in Attach Accept) • The RNC extracts the Attach Complete message and encapsulates it within a RANAP: Direct Transfer message • The Attach Complete is sent to the RNC encapsulated within RRC: Uplink Direct Transfer message Direct Transfer: Attach Accept Uplink Direct Transfer: Identity Response (DCH) Direct Transfer: Identity RequestDownlink Direct Transfer: Common ID (DCH) UE RNC SGSNNode B Secuirty Mode Complete (DCH) Security Mode CommandSecurity Mode Command (DCH) Uplink Direct Transfer: Authenication and Ciphering Response (DCH) Direct Transfer: Authentication and Ciphering Response Direct Transfer: Authentication and Ciphering RequestDownlink Direct Transfer: Authentication and Ciphering Request (DCH) SCCP: Connection Confirm RRC Connection Request (RACH) RRC Connection Setup (FACH) RRC Connection Setup Complete (DCH) Initial Direct Transfer: GPRS Attach Request (DCH) Initial UE message : GPRS Attach Request SCCP: Connection Request Common ID Direct Transfer: Identity Response Downlink Direct Transfer: Location Attach Accept (DCH) Direct Transfer: Attach CompleteUplink Direct Transfer: Attach Complete (DCH)
  • 25.
    Summary of GPRSAttach RRC Connection Setup Complete (DCH) FP: Downlink Sync FP: Uplink Sync NBAP: Synchronisation Indication RRC: RRC Connection Setup (FACH) NBAP: Radio Link Setup Request NBAP: Radio Link Setup Response ALCAP: Establish Request ALCAP: Establish Confirm Direct Transfer: Attach Accept Uplink Direct Transfer: Identity Response (DCH) Direct Transfer: Identity RequestDownlink Direct Transfer: Common ID (DCH) UE RNC SGSNNode B Secuirty Mode Complete (DCH) Security Mode CommandSecurity Mode Command (DCH) Uplink Direct Transfer: Authenication and Ciphering Response (DCH) Direct Transfer: Authentication and Ciphering Response Direct Transfer: Authentication and Ciphering RequestDownlink Direct Transfer: Authentication and Ciphering Request (DCH) SCCP: Connection Confirm Initial Direct Transfer: GPRS Attach Request (DCH) Initial UE message : GPRS Attach Request SCCP: Connection Request Common ID Direct Transfer: Identity Response Downlink Direct Transfer: Location Attach Accept (DCH) Direct Transfer: Attach CompleteUplink Direct Transfer: Attach Complete (DCH) L1 Synchronisation RRC Connection Request (RACH)
  • 26.
    PS Call UEis powered up Read BCCH Cell selection Register with core network Cell State Transitions Radio frame synchronisation Cell search Originating PS Call • The PS call can be either mobile originated or mobile terminated • The following slides present a mobile originated call • The first step is to establish an RRC connection, however if the follow on“ request is SET in NAS Message GPRS” – ‘ Attach Request -> there is no Iu release as’ CN is waiting for additional signalling using the same RRC (e.g. PDP context Activation) • This means that RRC Connections for PS calls are initiated with cause : registration
  • 27.
    ActivatePDPContext Request UE RNCSGSNNode B Uplink Direct Transfer : Activate PDP context request (DCH) • Having attached with the PS Core NW, UE sends Activate PDP context request DCCH ->DCH -> DPCH • By sending this message UE requests a service for the packet switched connection establishment • DCCH contains the RRC: Uplink Direct Transfer message • Message is sent using acknowledged mode RLC Direct Transfer : Activate PDP context request GPRS Attach
  • 28.
    NAS– Message: ActivatePDPContextRequest IEI Information Element Type/Reference Presence Format Length Protocol discriminator Protocol discriminator 10.2 M V 1/2 Transaction identifier Transaction identifier 10.3.2 M V 1/2– 3/2 Activate PDP context request message identity Message type 10.4 M V 1 Requested NSAPI Network service access point identifier 10.5.6.2 M V 1 Requested LLC SAPI LLC service access point identifier 10.5.6.9 M V 1 Requested QoS Quality of service 10.5.6.5 M LV 12 Requested PDP address Packet data protocol address 10.5.6.4 M LV 3 - 19 28 Access point name Access point name 10.5.6.1 O TLV 3 - 102 27 Protocol configuration options Protocol configuration options 10.5.6.3 O TLV 3 - 253
  • 29.
    RAB Assignment Request UERNC SGSNNode B Uplink Direct Transfer : Activate PDP context request (DCH) Direct Transfer : Activate PDP context request RAB Assignment Request • Having received the Activate PDP Context Request message the PS core sends the RANAP: RAB Assignment Resuest message to the RNC • The RANAP: RAB Assignment Resuest message requests the RNC to establish a RAB with a specified set of QoS parameters • The PS core requests these QoS parameters based upon the subscription and the service being requested (as seen from Activate PDP Context Request message the QoS is based entirely on the subscription) GPRS Attach
  • 30.
    Radio Bearer Setup UERNC SGSNNode B Uplink Direct Transfer : Activate PDP context request (DCH) Direct Transfer : Activate PDP context request RANAP: RAB Assignment Request RRC: Radio Bearer Setup • Once the RANAP: RAB Assignment Request message has been received from PS CN and RNC has resources to setup the RB the RNC sends a RRC: Radio Bearer Setup message to the UE GPRS Attach
  • 31.
    Example: RB Setupfor UL: 64 DL: 64 PSconnection Higher layer RAB/Signalling RB RAB RLC Logical channel type DTCH RLC mode AM Payload sizes, bit 320 Max data rate, bps 64 000 AMD PDU header, bit 16 MAC MAC header, bit 0 MAC multiplexing N/A Layer 1 TrCH type DCH TB sizes, bit 336 TFS TF0, bits 0x336 TF1, bits 1x336 TF2, bits 2x336 TF3, bits 3x336 TF4, bits 4x336 TTI, ms 20 Coding type TC CRC, bit 16 Max number of bits/TTI after channel coding 4 236 Uplink: Max number of bits/radio frame before rate matching 2 118 RM attribute 130 to 170
  • 32.
    Radio Bearer SetupComplete UE RNC SGSNNode B Uplink Direct Transfer : Activate PDP context request (DCH) Direct Transfer : Activate PDP context request RANAP: RAB Assignment Request RRC: Radio Bearer Setup Radio Bearer Setup Complete • The UE acknowledges the RRC: Radio Bearer Setup message with a RRC: Radio Bearer Setup Complete message GPRS Attach
  • 33.
    RAB Assignment Response UERNC SGSNNode B Uplink Direct Transfer : Activate PDP context request (DCH) Direct Transfer : Activate PDP context request RANAP: RAB Assignment Request RRC: Radio Bearer Setup Radio Bearer Setup Complete • Once the radio bearer establishment has been acknowledged, the RNC indicates to the PS core that the RAB has been established using the RANAP: RAB Assignment Response message RAB Assignment Response GPRS Attach
  • 34.
    Measurement Control UE RNCSGSNNode B Uplink Direct Transfer : Activate PDP context request (DCH) Direct Transfer : Activate PDP context request RANAP: RAB Assignment Request RRC: Radio Bearer Setup Radio Bearer Setup Complete RAB Assignment Response Measurement Control • Once the RAB has been established the RNC sends a measurement control messages •For traffic volume measurements (UE internal) •For intra and inter frequency measurements • Prior to receiving this message, the UE uses the measurement control information from the SIBs (inter and intra freq. Measurements traffic volume measurements are not– performed prior to measurement control) • Measurement control defines the reporting thresholds for Measurement Control GPRS Attach
  • 35.
    ActivatePDPContext Accept UE RNCSGSNNode B Uplink Direct Transfer : Activate PDP context request (DCH) Direct Transfer : Activate PDP context request RANAP: RAB Assignment Request RRC: Radio Bearer Setup Radio Bearer Setup Complete • Once the radio access bearer establishment has been acknowledged, (measurement control messages can be sent before or after the Activate PDP Context Accept) the PS CN indicates to the UE that the PDP Context Ativation has been successfully established using the RANAP: Activate PDP Context Accept message • RNC receives the Direct Transfer : Activate PDP Context Accept message and forwards it as Downlink Direct Transfer : Activate PDP Context Accept message to the UE RAB Assignment Response Direct Transfer: Activate PDP Context AcceptDownlink Direct Transfer : Activate PDP Context Accept (DCH) Measurement Control Measurement Control GPRS Attach
  • 36.
    64kbpsUL & DLConnection Established UE RNC SGSNNode B Uplink Direct Transfer : Activate PDP context request (DCH) Direct Transfer : Activate PDP context request RANAP: RAB Assignment Request RRC: Radio Bearer Setup Radio Bearer Setup Complete • UL: 64 DL: 64 kbps PS data call Established RAB Assignment Response Direct Transfer: Activate PDP Context AcceptDownlink Direct Transfer : Activate PDP Context Accept (DCH) Call Established Measurement Control Measurement Control GPRS Attach
  • 37.
  • 38.
    Reporting Event 4a UERNC SGSNNode B Uplink Direct Transfer : Activate PDP context request (DCH) Direct Transfer : Activate PDP context request RANAP: RAB Assignment Request RRC: Radio Bearer Setup Radio Bearer Setup Complete RAB Assignment Response Direct Transfer: Activate PDP Context AcceptDownlink Direct Transfer : Activate PDP Context Accept (DCH) Packet Call Established Measurement Control Measurement Control Measurement Report : e4a • Once the UE determines that an event 4a has occurred it sends a measurement report to the RNC. This is done using the RRC: Measurement Report message • As instructed, the UE sends measurement report when the RLC buffer absolute payload exceeds the threshold • The measurement identity reflects that provided within the measurement control message GPRS Attach
  • 39.
    Radio Link ReconfigurePrepare UE RNC SGSNNode B • Assuming that the admission control procedure within the RNC decides to accept the capacity request from UE, the RNC prepares to reconfigure the radio link at the Node B by sending the NBAP: Radio Link Reconfigure Prepare message NBAP: Radio Link Reconfigure Prepare Uplink Direct Transfer : Activate PDP context request (DCH) Direct Transfer : Activate PDP context request RANAP: RAB Assignment Request RRC: Radio Bearer Setup Radio Bearer Setup Complete RAB Assignment Response Direct Transfer: Activate PDP Context AcceptDownlink Direct Transfer : Activate PDP Context Accept (DCH) Call Established Measurement Control Measurement Control Measurement Report : e4a GPRS Attach
  • 40.
    Radio Link ReconfigureReady Radio Link Reconfigure Ready • The Node B responds to the NBAP: Radio Link Reconfigure Prepare message with a NBAP: Radio Link Reconfigure Ready message UE RNC SGSNNode B NBAP: Radio Link Reconfigure Prepare Uplink Direct Transfer : Activate PDP context request (DCH) Direct Transfer : Activate PDP context request RANAP: RAB Assignment Request RRC: Radio Bearer Setup Radio Bearer Setup Complete RAB Assignment Response Direct Transfer: Activate PDP Context AcceptDownlink Direct Transfer : Activate PDP Context Accept (DCH) Call Established Measurement Control Measurement Control Measurement Report : e4a GPRS Attach
  • 41.
    AAL2SIG:ECF AAL2SIG:ERQ Radio Link ReconfigureReady UE RNC SGSNNode B NBAP: Radio Link Reconfigure Prepare Uplink Direct Transfer : Activate PDP context request (DCH) Direct Transfer : Activate PDP context request RANAP: RAB Assignment Request RRC: Radio Bearer Setup Radio Bearer Setup Complete RAB Assignment Response Direct Transfer: Activate PDP Context AcceptDownlink Direct Transfer : Activate PDP Context Accept (DCH) Call Established Measurement Control Measurement Control Measurement Report : e4a FP: Downlink Sync FP: Uplink Sync Radio Link Reconfiguration Commit Radio Link Reconfiguration Commit • Once the transmission resouce allocations have been configured the RNC sends a NBAP: Radio Link Reconfiguration Commit message to the Node B GPRS Attach
  • 42.
    AAL2SIG:ECF AAL2SIG:ERQ Radio Link ReconfigureReady UE RNC SGSNNode B NBAP: Radio Link Reconfigure Prepare Uplink Direct Transfer : Activate PDP context request (DCH) Direct Transfer : Activate PDP context request RANAP: RAB Assignment Request RRC: Radio Bearer Setup Radio Bearer Setup Complete RAB Assignment Response Direct Transfer: Activate PDP Context AcceptDownlink Direct Transfer : Activate PDP Context Accept (DCH) Call Established Measurement Control Measurement Control Measurement Report : e4a FP: Downlink Sync FP: Uplink Sync Radio Link Reconfiguration Commit Radio Bearer Reconfiguration • Once the reconfiguration of radio link at Node-B is done the RNC sends a RRC: RRC: Radio Bearer Reconfiguration message to UE RRC: Radio Bearer Reconfiguration (DCH) GPRS Attach
  • 43.
    AAL2SIG:ECF AAL2SIG:ERQ Radio Link ReconfigureReady UE RNC SGSNNode B NBAP: Radio Link Reconfigure Prepare Uplink Direct Transfer : Activate PDP context request (DCH) Direct Transfer : Activate PDP context request RANAP: RAB Assignment Request RRC: Radio Bearer Setup Radio Bearer Setup Complete RAB Assignment Response Direct Transfer: Activate PDP Context AcceptDownlink Direct Transfer : Activate PDP Context Accept (DCH) Call Established Measurement Control Measurement Control Measurement Report : e4a FP: Downlink Sync FP: Uplink Sync Radio Link Reconfiguration Commit Radio Bearer Reconfiguration Complete • The UE acknowledges the RRC: Radio Bearer Reconfiguration message with a RRC: Radio Bearer Reconfiguration Complete message RRC: Radio Bearer Reconfiguration (DCH) RRC: Radio Bearer Reconfiguration Complete (DCH) GPRS Attach
  • 44.
    AAL2SIG:ECF AAL2SIG:ERQ Radio Link ReconfigureReady UE RNC SGSNNode B NBAP: Radio Link Reconfigure Prepare Uplink Direct Transfer : Activate PDP context request (DCH) Direct Transfer : Activate PDP context request RANAP: RAB Assignment Request RRC: Radio Bearer Setup Radio Bearer Setup Complete RAB Assignment Response Direct Transfer: Activate PDP Context AcceptDownlink Direct Transfer : Activate PDP Context Accept (DCH) Call Established Measurement Control Measurement Control Measurement Report : e4a FP: Downlink Sync FP: Uplink Sync Radio Link Reconfiguration Commit UL: 64kbps DL: 128/384 kbps Connection Established RRC: Radio Bearer Reconfiguration (DCH) RRC: Radio Bearer Reconfiguration Complete (DCH) GPRS Attach
  • 45.
    Cell State Transitions •When the RNC notices that there is nothing being transmitted between UE and RNC, inactivity timers will start to run and in case of expiry of those timers the UE is moved to use common channels i.e. cell state transition from Cell_DCH to Cell_FACH occurs • In order to save some UE battery power (as in Cell_FACH the UE has to read FACH channel all the time) in case of further in activity i.e. no capacity requests from UE nor RNC the UE is further moved to Cell_PCH where the UE only listens PCH (paging channel) UE is powered up Read BCCH Cell selection Register with core network Cell State Transitions Radio frame synchronisation Cell search Originating PS Call
  • 46.
    AAL2SIG:ECF AAL2SIG:ERQ Radio Link ReconfigureReady UE RNC SGSNNode B NBAP: Radio Link Reconfigure Prepare Call Established Measurement Report : e4a FP: Downlink Sync FP: Uplink Sync Radio Link Reconfiguration Commit Radio Bearer Reconfiguration RRC: Radio Bearer Reconfiguration (DCH) RRC: Radio Bearer Reconfiguration Complete (DCH) Measurement Control RRC: Radio Bearer Reconfiguration (DCH) Data Flow • In case the RNC decides to move the UE to Cell_FACH state it sends RRC: Radio Bearer Reconfiguration GPRS Attach
  • 47.
    Radio Bearer Reconfiguration Complete •The UE acknowledges the RRC: Radio Bearer Reconfiguration message with a RRC: Radio Bearer Reconfiguration Complete message on RACH AAL2SIG:ECF AAL2SIG:ERQ Radio Link Reconfigure Ready UE RNC SGSNNode B NBAP: Radio Link Reconfigure Prepare Call Established Measurement Report : e4a FP: Downlink Sync FP: Uplink Sync Radio Link Reconfiguration Commit RRC: Radio Bearer Reconfiguration (DCH) RRC: Radio Bearer Reconfiguration Complete (DCH) Measurement Control RRC: Radio Bearer Reconfiguration (DCH) Data Flow RRC: Radio Bearer Reconfiguration Complete (RACH) GPRS Attach
  • 48.
    Measurement Control • RNCsends RRC: Measurement Control message to the UE to setup the UE traffic volume measurements for the UE capacity requests (e4a) Measurement Control (FACH) AAL2SIG:ECF AAL2SIG:ERQ Radio Link Reconfigure Ready UE RNC SGSNNode B NBAP: Radio Link Reconfigure Prepare Call Established Measurement Report : e4a FP: Downlink Sync FP: Uplink Sync Radio Link Reconfiguration Commit RRC: Radio Bearer Reconfiguration (DCH) RRC: Radio Bearer Reconfiguration Complete (DCH) Measurement Control RRC: Radio Bearer Reconfiguration (DCH) Data Flow RRC: Radio Bearer Reconfiguration Complete (RACH) GPRS Attach
  • 49.
    Radio Link DeletionRequest • RNC sends NBAP: Radio Link Deletion Request message to the BTS to delete the dedicated resources from the BTS for the UE moved to the Cell_FACH Measurement Control (FACH) AAL2SIG:ECF AAL2SIG:ERQ Radio Link Reconfigure Ready UE RNC SGSNNode B NBAP: Radio Link Reconfigure Prepare Call Established Measurement Report : e4a FP: Downlink Sync FP: Uplink Sync Radio Link Reconfiguration Commit RRC: Radio Bearer Reconfiguration (DCH) RRC: Radio Bearer Reconfiguration Complete (DCH) Measurement Control RRC: Radio Bearer Reconfiguration (DCH) Data Flow RRC: Radio Bearer Reconfiguration Complete (RACH) NBAP: Radio Link Deletion Request GPRS Attach
  • 50.
    Radio Link DeletionResponse Measurement Control (FACH) AAL2SIG:ECF AAL2SIG:ERQ Radio Link Reconfigure Ready UE RNC SGSNNode B NBAP: Radio Link Reconfigure Prepare Call Established Measurement Report : e4a FP: Downlink Sync FP: Uplink Sync Radio Link Reconfiguration Commit RRC: Radio Bearer Reconfiguration (DCH) RRC: Radio Bearer Reconfiguration Complete (DCH) Measurement Control RRC: Radio Bearer Reconfiguration (DCH) Data Flow RRC: Radio Bearer Reconfiguration Complete (RACH) NBAP: Radio Link Deletion Response NBAP: Radio Link Deletion Request GPRS Attach
  • 51.
    UE in Cell_FACH MeasurementControl (FACH) AAL2SIG:ECF AAL2SIG:ERQ Radio Link Reconfigure Ready UE RNC SGSNNode B NBAP: Radio Link Reconfigure Prepare GPRS Attach Call Established Measurement Report : e4a FP: Downlink Sync FP: Uplink Sync Radio Link Reconfiguration Commit RRC: Radio Bearer Reconfiguration (DCH) RRC: Radio Bearer Reconfiguration Complete (DCH) Measurement Control RRC: Radio Bearer Reconfiguration (DCH) Data Flow RRC: Radio Bearer Reconfiguration Complete (RACH) NBAP: Radio Link Deletion Response NBAP: Radio Link Deletion Request ALCAP: Release Request ALCAP: Release Confirm UE in Cell_FACH, PDP Context Active and GPRS Attached
  • 52.
    Physical Channel Reconfiguration MeasurementControl (FACH) UE RNC SGSNNode B GPRS Attach Call Established RRC: Radio Bearer Reconfiguration (DCH) Data Flow RRC: Radio Bearer Reconfiguration Complete (RACH) NBAP: Radio Link Deletion Response NBAP: Radio Link Deletion Request ALCAP: Release Request ALCAP: Release Confirm UE in Cell_FACH, PDP Context Active and GPRS Attached RRC: Physical Channel Reconfiguration (FACH) RRC: Physical Channel Reconfiguration Complete (RACH) • RNC sends RRC: Physical Channel Reconfiguration message to the UE to move the UE to Cell_PCH state
  • 53.
    UE in Cell_PCH MeasurementControl (FACH) UE RNC SGSNNode B GPRS Attach Call Established RRC: Radio Bearer Reconfiguration (DCH) Data Flow RRC: Radio Bearer Reconfiguration Complete (RACH) NBAP: Radio Link Deletion Response NBAP: Radio Link Deletion Request ALCAP: Release Request ALCAP: Release Confirm UE in Cell_FACH, PDP Context Active and GPRS Attached RRC: Physical Channel Reconfiguration (FACH) RRC: Physical Channel Reconfiguration Complete (RACH) UE in Cell_PCH, PDP Context Active and GPRS Attached
  • 54.
    Cell Update Measurement Control(FACH) UE RNC SGSNNode B GPRS Attach Call Established RRC: Radio Bearer Reconfiguration (DCH) Data Flow RRC: Radio Bearer Reconfiguration Complete (RACH) NBAP: Radio Link Deletion Response NBAP: Radio Link Deletion Request ALCAP: Release Request ALCAP: Release Confirm UE in Cell_FACH, PDP Context Active and GPRS Attached RRC: Physical Channel Reconfiguration (FACH) RRC: Physical Channel Reconfiguration Complete (RACH) UE in Cell_PCH, PDP Context Active and GPRS Attached RRC: Cell Update (RACH) • In case the UE has something to send it has to send RRC: Cell Update message to the RNC to move the UE to Cell_FACH state to get dedicated resources
  • 55.
    Cell Update Confirm MeasurementControl (FACH) UE RNC SGSNNode B GPRS Attach Call Established RRC: Radio Bearer Reconfiguration (DCH) Data Flow RRC: Radio Bearer Reconfiguration Complete (RACH) NBAP: Radio Link Deletion Response NBAP: Radio Link Deletion Request ALCAP: Release Request ALCAP: Release Confirm UE in Cell_FACH, PDP Context Active and GPRS Attached RRC: Physical Channel Reconfiguration (FACH) RRC: Physical Channel Reconfiguration Complete (RACH) UE in Cell_PCH, PDP Context Active and GPRS Attached RRC: Cell Update (RACH) • RNC acknowledges the UE message RRC: Cell Update with RRC: Cell Update Confirm message and instructs UE to move to Cell_FACH state RRC: Cell Update Confirm (FACH)
  • 56.
    Utran Mobility InformationConfirm Measurement Control (FACH) UE RNC SGSNNode B GPRS Attach Call Established RRC: Radio Bearer Reconfiguration (DCH) Data Flow RRC: Radio Bearer Reconfiguration Complete (RACH) NBAP: Radio Link Deletion Response NBAP: Radio Link Deletion Request ALCAP: Release Request ALCAP: Release Confirm UE in Cell_FACH, PDP Context Active and GPRS Attached RRC: Physical Channel Reconfiguration (FACH) RRC: Physical Channel Reconfiguration Complete (RACH) UE in Cell_PCH, PDP Context Active and GPRS Attached RRC: Cell Update (RACH) • UE acknowledges the RNC message RRC: Cell Update Confirm and the parameters given to UE in that message with RRC: Utran Mobility Information Confirm message RRC: Cell Update Confirm (FACH) RRC: Utran Mobility Information Confirm (RACH)
  • 57.
    Measurement Control Measurement Control(FACH) UE RNC SGSNNode B GPRS Attach Call Established RRC: Radio Bearer Reconfiguration (DCH) Data Flow RRC: Radio Bearer Reconfiguration Complete (RACH) NBAP: Radio Link Deletion Response NBAP: Radio Link Deletion Request ALCAP: Release Request ALCAP: Release Confirm UE in Cell_FACH, PDP Context Active and GPRS Attached RRC: Physical Channel Reconfiguration (FACH) RRC: Physical Channel Reconfiguration Complete (RACH) UE in Cell_PCH, PDP Context Active and GPRS Attached RRC: Cell Update (RACH) • Measurement Control message for Traffic Volume Measurement reporting is sent to UE RRC: Cell Update Confirm (FACH) RRC: Utran Mobility Information Confirm (RACH) RRC: Measurement Control (FACH)
  • 58.
    Radio Link Setup& Establishment RequestUE RNC SGSNNode B GPRS Attach Call Established Data Flow UE in Cell_FACH, PDP Context Active and GPRS Attached RRC: Physical Channel Reconfiguration (FACH) RRC: Physical Channel Reconfiguration Complete (RACH) UE in Cell_PCH, PDP Context Active and GPRS Attached RRC: Cell Update (RACH) RRC: Cell Update Confirm (FACH) RRC: Utran Mobility Information Confirm (RACH) RRC: Measurement Control (FACH) AAL2SIG:ECF AAL2SIG:ERQ NBAP: Radio Link Setup Response NBAP: Radio Link Setup Measurement Report : e4a FP: Downlink Sync FP: Uplink Sync As explained earlier: this time just set up 64/64
  • 59.
    Radio Bearer Reconfiguration UERNC SGSNNode B GPRS Attach Call Established Data Flow UE in Cell_FACH, PDP Context Active and GPRS Attached RRC: Physical Channel Reconfiguration (FACH) RRC: Physical Channel Reconfiguration Complete (RACH) UE in Cell_PCH, PDP Context Active and GPRS Attached RRC: Cell Update (RACH) RRC: Cell Update Confirm (FACH) RRC: Utran Mobility Information Confirm (RACH) RRC: Measurement Control (FACH) AAL2SIG:ECF AAL2SIG:ERQ NBAP: Radio Link Setup Response NBAP: Radio Link Setup Measurement Report : e4a FP: Downlink Sync FP: Uplink Sync RRC: Radio Bearer Reconfiguration (DCH) As explained earlier: this time just set up 64/64
  • 60.
    UE RNC SGSNNodeB GPRS Attach Call Established Data Flow UE in Cell_FACH, PDP Context Active and GPRS Attached RRC: Physical Channel Reconfiguration (FACH) RRC: Physical Channel Reconfiguration Complete (RACH) UE in Cell_PCH, PDP Context Active and GPRS Attached RRC: Cell Update (RACH) RRC: Cell Update Confirm (FACH) RRC: Utran Mobility Information Confirm (RACH) RRC: Measurement Control (FACH) AAL2SIG:ECF AAL2SIG:ERQ NBAP: Radio Link Setup Response NBAP: Radio Link Setup Measurement Report : e4a FP: Downlink Sync FP: Uplink Sync NBAP: Synchronisation Indication RRC: Radio Bearer Reconfiguration (FACH) • The UE acknowledges the RRC: Radio Bearer Reconfiguration message with a RRC: Radio Bearer Reconfiguration Complete message RRC: Radio Bearer Reconfiguration Complete (DCH) NBAP: Synchronisation Indication Radio Bearer Reconfiguration Complete
  • 61.
    UE RNC SGSNNodeB GPRS Attach Call Established Data Flow UE in Cell_FACH, PDP Context Active and GPRS Attached RRC: Physical Channel Reconfiguration (FACH) RRC: Physical Channel Reconfiguration Complete (RACH) UE in Cell_PCH, PDP Context Active and GPRS Attached RRC: Cell Update (RACH) RRC: Cell Update Confirm (FACH) RRC: Utran Mobility Information Confirm (RACH) RRC: Measurement Control (FACH) AAL2SIG:ECF AAL2SIG:ERQ NBAP: Radio Link Setup Response NBAP: Radio Link Setup Measurement Report : e4a FP: Downlink Sync FP: Uplink Sync NBAP: Synchronisation Indication RRC: Radio Bearer Reconfiguration (FACH) • The UE acknowledges the RRC: Radio Bearer Reconfiguration message with a RRC: Radio Bearer Reconfiguration Complete message RRC: Radio Bearer Reconfiguration Complete (DCH) NBAP: Synchronisation Indication Measurement Control Measurement Control Measurement Control Measurement Control for intra- frequency measurements and stopping traffic
  • 62.
    UE RNC SGSNNodeB GPRS Attach Call Established Data Flow UE in Cell_DCH, PDP Context Active and GPRS Attached Deactivate PDP Context Request UpLink Direct Transfer : Deactivate PDP Context Request (DCH) Direct Transfer : Deactivate PDP Context Request (DCH) • The UE requests deactivation of PDP context by sending the Deactivate PDP Context Request towards the PS core encapsulated within RRC: Uplink Direct Transfer
  • 63.
    UE RNC SGSNNodeB GPRS Attach Call Established Data Flow UE in Cell_DCH, PDP Context Active and GPRS Attached Deactivate PDP Context Accept UpLink Direct Transfer : Deactivate PDP Context Request (DCH) Direct Transfer : Deactivate PDP Context Request Direct Transfer : Deactivate PDP Context AcceptDownlink Direct Transfer : Deactivate PDP Context Accept (DCH) • The PS CN acknowledges the deactivation of PDP context by sending Deactivate PDP Context Accept to the UE encapsulated within RRC: Downlink Direct Transfer
  • 64.
    RAB Assignment Request RANAP:RAB Assignment Request UE RNC SGSNNode B GPRS Attach Call Established Data Flow UE in Cell_DCH, PDP Context Active and GPRS Attached UpLink Direct Transfer : Deactivate PDP Context Request (DCH) Direct Transfer : Deactivate PDP Context Request Direct Transfer : Deactivate PDP Context AcceptDownlink Direct Transfer : Deactivate PDP Context Accept (DCH) • The PS CN sends the RAB modification (release) request to the RNC by RANAP: RAB Assignment Request
  • 65.
    RAB Assignment Response RANAP:RAB Assignment Request RANAP: RAB Assignment Response UE RNC SGSNNode B GPRS Attach Call Established Data Flow UE in Cell_DCH, PDP Context Active and GPRS Attached UpLink Direct Transfer : Deactivate PDP Context Request (DCH) Direct Transfer : Deactivate PDP Context Request Direct Transfer : Deactivate PDP Context AcceptDownlink Direct Transfer : Deactivate PDP Context Accept (DCH) • The RNC acknowledges the RAB modification (release) and sends RANAP: RAB Assignment Response to the PS CN
  • 66.
    Radio Link ReconfigurationPrepare RANAP: RAB Assignment Request RANAP: RAB Assignment Response UE RNC SGSNNode B GPRS Attach Call Established Data Flow UE in Cell_DCH, PDP Context Active and GPRS Attached UpLink Direct Transfer : Deactivate PDP Context Request (DCH) Direct Transfer : Deactivate PDP Context Request Direct Transfer : Deactivate PDP Context AcceptDownlink Direct Transfer : Deactivate PDP Context Accept (DCH) NBAP: Radio Link Reconfiguration Prepare • The RNC starts RB modifications by sending modification information to the BTS NBAP: Radio Link Reconfiguration Prepare
  • 67.
    Radio Link ReconfigurationReady RANAP: RAB Assignment Request RANAP: RAB Assignment Response UE RNC SGSNNode B GPRS Attach Call Established Data Flow UE in Cell_DCH, PDP Context Active and GPRS Attached UpLink Direct Transfer : Deactivate PDP Context Request (DCH) Direct Transfer : Deactivate PDP Context Request Direct Transfer : Deactivate PDP Context AcceptDownlink Direct Transfer : Deactivate PDP Context Accept (DCH) NBAP: Radio Link Reconfiguration Prepare NBAP: Radio Link Reconfiguration Ready • The BTS acknowledges the RB modifications by sending NBAP: Radio Link Reconfiguration Ready
  • 68.
    Radio Link ReconfigurationCommit RANAP: RAB Assignment Request RANAP: RAB Assignment Response UE RNC SGSNNode B GPRS Attach Call Established Data Flow UE in Cell_DCH, PDP Context Active and GPRS Attached UpLink Direct Transfer : Deactivate PDP Context Request (DCH) Direct Transfer : Deactivate PDP Context Request Direct Transfer : Deactivate PDP Context AcceptDownlink Direct Transfer : Deactivate PDP Context Accept (DCH) NBAP: Radio Link Reconfiguration Prepare NBAP: Radio Link Reconfiguration Ready NBAP: Radio Link Reconfiguration Commit • After receiving successful response from BTS the RNC orders BTS to take the modifications into use by sending NBAP: Radio Link Reconfiguration Commit
  • 69.
    Radio Bearer Release RANAP:RAB Assignment Request RANAP: RAB Assignment Response UE RNC SGSNNode B GPRS Attach Call Established Data Flow UE in Cell_DCH, PDP Context Active and GPRS Attached UpLink Direct Transfer : Deactivate PDP Context Request (DCH) Direct Transfer : Deactivate PDP Context Request Direct Transfer : Deactivate PDP Context AcceptDownlink Direct Transfer : Deactivate PDP Context Accept (DCH) NBAP: Radio Link Reconfiguration Prepare NBAP: Radio Link Reconfiguration Ready NBAP: Radio Link Reconfiguration Commit RRC: Radio Bearer Release (DCH) • Then the RNC is ready to inform the UE about the changes in the RB by sending RRC: Radio Bearer Release
  • 70.
    Radio Bearer ReleaseComplete RANAP: RAB Assignment Request RANAP: RAB Assignment Response UE RNC SGSNNode B GPRS Attach Call Established Data Flow UE in Cell_DCH, PDP Context Active and GPRS Attached UpLink Direct Transfer : Deactivate PDP Context Request (DCH) Direct Transfer : Deactivate PDP Context Request Direct Transfer : Deactivate PDP Context AcceptDownlink Direct Transfer : Deactivate PDP Context Accept (DCH) NBAP: Radio Link Reconfiguration Prepare NBAP: Radio Link Reconfiguration Ready NBAP: Radio Link Reconfiguration Commit RRC: Radio Bearer Release (DCH) • Then the RNC is ready to inform the UE about the changes in the RB by sending RRC: Radio Bearer Release • After this there is only signalling link active between the UE and PS CN and the UE can be moved to Cell_FACH and to Cell_PCH still maintaining the signalling link or the signalling link can be deactivated by doing GPRS detach or by releasing the RRC connection (and RRC: Radio Bearer Release Complete (DCH)
  • 71.
    UE GPRS Attachedand PDP Deactivated in Cell_PCH (I) • In case the UE is GPRS Attached and in Cell_PCH state the UE needs to send RRC: Cell Update message indicating UL capacity request after that the PDP Context activation procedure as above where the messaging is as explained earlier • Then PDP Context is activated using common channels, RAB and RB setup • UE internal measurements are activated and in case UE has something to send in addition to just activating PDP Context • In case UE sends Measurement Report for event 4a the dedicated resources are setup with radio bearer reconfiguration •This is also reconfiguration from Cell_FACH to Cell_DCH
  • 72.
    UE RNC SGSNNodeB GPRS Attach Call Established Data Flow UE in Cell_PCH, GPRS Attached RRC : Cell Update (RACH) RRC : Cell Update Confirm (FACH) UpLink Direct Transfer : Activate PDP Context Request (RACH) Direct Transfer : Activate PDP Context Request Direct Transfer : Activate PDP Context AcceptDownlink Direct Transfer : Activate PDP Context Accept (FACH) RRC : Utran Mobility Information Confirm (RACH) RANAP : RAB Assignment Request RANAP : RAB Assignment Response RRC : Radio Bearer Setup (FACH) RRC : Radio Bearer Setup Complete (RACH) RRC : Measurement Control (FACH) RRC : Measurement Control (FACH) RRC : Measurement Report (E4a) (RACH) NBAP : Radio Link Setup NBAP : Radio Link Setup Response RRC: Radio Bearer Reconfiguration (FACH) NBAP : Radio Link Synchronisation RRC: Radio Bearer Reconfiguration Complete (DCH) RRC : Measurement Control (DCH) RRC : Measurement Control (DCH) UE GPRS Attached and PDP Deactivated in Cell_PCH (II)
  • 73.
    UE GPRS attachedand PDP Deactivated in Idle Mode (I) • In case the UE has deactivated PDP Context and is moved to idle mode (still attached) the UE must initiate RRC Connection Setup procedure before it can request new PDP context activation • The RNC has to re-establish the Iu resources for the UE by CM service request
  • 74.
    UE RNC SGSNNodeB GPRS Attach Call Established Data Flow UE in idle, GPRS Attached, PDP Context Deactive RRC : RRC Connection request (RACH) RRC : RRC Connection Setup (FACH) Initial UE Message : GPRS Service Request RRC : RRC Connection Setup Complete (DCH) NBAP : Radio Link Setup NBAP : Radio Link Setup Response NBAP : Radio Link Synchronisation Initial Direct Transfer : GPRS Service Request (DCH) Security Mode Complete (DCH) Security Mode Command RANAP: Direct Transfer : GPRS Activate PDP Context AcceptRRC: Downlink Direct Transfer : GPRS Activate PDP Context Accept (DCH) RANAP: Direct Transfer : GPRS P-TMSI Reallocation CompleteRRC: Uplink Direct Transfer : GPRS P-TMSI Reallocation Complete (DCH) RANAP: RAB Assignment RequestRRC: Radio Bearer Setup (DCH) RRC : Radio Bearer Setup Complete (DCH) RANAP :RAB Assignment Response RRC: Measurement Control (DCH) RRC: Measurement Control (DCH) RRC : Measurement Report (e4a) (DCH) NBAP : Radio Link Reconfiguration Prepare NBAP : Radio Link Reconfiguration Ready NBAP : Radio Link Reconfiguration Commit RRC: Radio Bearer Reconfiguration (DCH) RRC : Radio Bearer Reconfiguration Complete (DCH) RRC: Measurement Control (DCH) UE GPRS Attached and PDP Deactivated in Idle Mode (I) RRC: Uplink Direct Transfer: GPRS Activate PDP Context Request (DCH) RANAP: Direct Transfer: GPRS Activate PDP Context Request RANAP: Direct Transfer : GPRS P-TMSI Reallocation CommandRRC: Downlink Direct Transfer : GPRS P-TMSI Reallocation Command (DCH)