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Eleven EMM Cases in an EMM Scenario

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  • 1. Netmanias Technical Document: EMM Scenario and Eleven EMM Cases www.nmcgroups.com EMM Scenario and Eleven EMM Cases February 13, 2013 (Last Updated: February 21, 2013) NMC Consulting Group www.netmanias.com www.nmcgroups.com About NMC Consulting Group NMC Consulting Group was founded on year 2002 and is advanced, professional network consulting company which is specialized for IP Network area like FTTH, Metro Ethernet and IP/MPLS, Service area like IPTV, IMS and CDN lastly, Wireless network area like Mobile WiMAX, LTE and Wi-Fi. Copyright © 2002-2013 NMC Consulting Group. All rights reserved.
  • 2. Netmanias Technical Document: EMM Scenario and Eleven EMM Cases EMM Scenario PLMN (LTE Operator Network) City 1 (Seoul) City 2 (Pusan) PCRF HSS MME S-GW SPR MME P-GW S-GW Internet Target UE: UE A in City 1 Initial State: UE A is switched off, and there exists no UE context for the UE A in the network. (EMM-Deregistered + ECM-Idle + RRC-Idle) 6 6 Handover TA1 2 Detach 4 New TA4 7 Cell Reselection 10 Move to Another City (Out of Service Coverage) Traffic 3 3 Inactivity EMM-Registered + ECM-Connected + RRC-Connected Internet TA2 1 1 Attach EMM-Deregistered + ECM-Idle + RRC-Idle P-GW UE A Timeout of Periodic TAU 11 Attach TA3 8 8 Handover with TAU LTE Service Coverage Seoul 5 5 Periodic TAU EMM-Registered + ECM-Idle + RRC-Idle TAI List: TA1 TA2 User Plane Path 9 Cell Reselection with TAU 9 Pusan LTE Service Coverage Control Plane Path EMM Scenario Environments Copyright © 2002-2013 NMC Consulting Group. All rights reserved. 2
  • 3. Netmanias Technical Document: EMM Scenario and Eleven EMM Cases Brief Description of Eleven EMM Cases (1/4) EMM Case 1. Initial Attach  UE State: “EMM-Deregistered, ECM/RRC-Idle”  “EMM-Registered , ECM/RRC-Connected”  UE A is switched on. UE A enters the state “EMM-Deregistered, ECM-Idle, RRC-Idle” and tries to connect to the network.  There is no UE Context of UE A in UE A and MME.  After synchronizing to a cell, UE A initiates the Initial Attach procedure by sending an “Attach Request” message to the MME with IMSI as UE ID.  After successful completion of the Initial Attach procedure, UE A enters the state “EMM-Registered, ECM-Connected, RRC-Connected” and can use services that require registration. EMM Case 2. Detach  UE State: “EMM-Registered , ECM/RRC-Connected”  “EMM-Deregistered , ECM/RRC-Idle”  UE A is detached from the network in the state “EMM-Registered, ECM-Connected, RRC-Connected”.  According to the detach triggering factors, there are three types of Detach procedures: UE-Initiated, MME-Initiated and HSS-Initiated  Upon successful completion of the Detach procedure, UE A enters the state “EMM-Deregistered, ECM-Idle, RRC-Idle”. EMM Case 3. S1 Release due to User Inactivity  UE State: “EMM-Registered , ECM/RRC-Connected”  “EMM-Registered , ECM/RRC-Idle”  UE A is not using the service for a certain period of time in the state “EMM-Registered, ECM-Connected, RRC-Connected”.  User inactivity is detected by eNB, and the S1 bearer and S1 signaling connection are released.  After successful completion of the S1 Release procedure, the state of UE A transits to “EMM-Registered, ECM-Idle, RRC-Idle”. Copyright © 2002-2013 NMC Consulting Group. All rights reserved. 3
  • 4. Netmanias Technical Document: EMM Scenario and Eleven EMM Cases Brief Description of Eleven EMM Cases (2/4) EMM Case 4. Service Request due to New Traffic  UE State: “EMM-Registered , ECM/RRC-Idle”  “EMM-Registered , ECM/RRC-Connected”  New traffic is generated when UE A is in the state “EMM-Registered, ECM-Idle, RRC-Idle”.  The new traffic can be generated by UE A or the network, and the Service Request procedure is initiated.  After successful completion of the Service Request procedure, UE A transits to the state “EMM-Registered, ECM-Connected, RRCConnected”. EMM Case 5. Periodic Tracking Area Update (TAU)  UE State: : “EMM-Registered , ECM/RRC-Idle”  “EMM-Registered , ECM/RRC-Connected”  “EMM-Registered , ECM/RRC-Idle”  UE A is in the state “EMM-Registered, ECM-Idle, RRC-Idle”, and the periodic TAU timer (T3412) is expired.  UE A performs the Periodic TAU procedure: UE A transits to the state “EMM-Registered, ECM-Connected, RRC-Connected” by establishing an ECM connection to the MME by sending a “TAU Request” message.  After successful completion of the Periodic TAU procedure, the ECM connection is released and UE A returns to the state “EMMRegistered, ECM-Idle, RRC-Idle”. EMM Case 6. Handover without TAU  UE State: “EMM-Registered , ECM/RRC-Connected”  “EMM-Registered , ECM/RRC-Connected”  UE A in the state “EMM-Registered, ECM-Connected, RRC-Connected” moves a new cell and detects it enters a new TA included in the TAI list.  Handover is performed to the new cell, but the TAU procedure does not need to occur.  After successful completion of the Handover without TAU procedure, UE A remains in the state “EMM-Registered, ECM-Connected, RRC-Connected”. Copyright © 2002-2013 NMC Consulting Group. All rights reserved. 4
  • 5. Netmanias Technical Document: EMM Scenario and Eleven EMM Cases Brief Description of Eleven EMM Cases (3/4) EMM Case 7. Cell Reselection without TAU  UE State: “EMM-Registered , ECM/RRC-Idle”  “EMM-Registered , ECM/RRC-Idle”  UE A is in the state “EMM-Registered, ECM-Idle, RRC-Idle”. UE A moves a new cell and detects it enters a new TA in the TAI list.  Cell Reselection is occurred to the new cell, but TAU procedure is not performed.  After the Cell Reselection without TAU procedure, UE A remains in the state “EMM-Registered, ECM-Idle, RRC-Idle”. EMM Case 8. Handover with TAU  UE State: “EMM-Registered , ECM/RRC-Connected”  “EMM-Registered , ECM/RRC-Connected”  UE A in the state “EMM-Registered, ECM-Connected, RRC-Connected” moves a new cell and detects it enters a new TA not included in the TAI list.  Handover is performed to the new cell, then UE A performs the TAU procedure.  After successful completion of the Handover with TAU procedure, UE A remains in the state “EMM-Registered, ECM-Connected, RRCConnected”. EMM Case 9. Cell Reselection with TAU  UE State: “EMM-Registered , ECM/RRC-Idle”  “EMM-Registered , ECM/RRC-Connected”  “EMM-Registered , ECM/RRC-Idle”  UE A in the state “EMM-Registered, ECM-Idle, RRC-Idle” moves a new cell and detects it enters a new TA not included in the TAI list.  Cell Reselection is performed to the new cell, the UE A performs the TAU procedure: UE A transits to the state “EMM-Registered, ECM-Connected, RRC-Connected“ by establishing an ECM connection to the MME by sending a “TAU Request” message.  After the TAU Update procedure, the ECM connection is released and UE A returns to the state “EMM-Registered, ECM-Idle, RRC-Idle”. Copyright © 2002-2013 NMC Consulting Group. All rights reserved. 5
  • 6. Netmanias Technical Document: EMM Scenario and Eleven EMM Cases Brief Description of Eleven EMM Cases (4/4) EMM Case 10. Move to Another City  UE State: “EMM-Registered , ECM/RRC-Connected” or “EMM-Registered , ECM/RRC-Idle”  “EMMDeregistered , ECM/RRC-Idle”  UE A (being served or in Idle state) in the City 1 moves to the City 2. UE A moves out the LTE coverage and detached from the network.  After the Detach procedure, UE A enters the state “EMM-Deregistered, ECM-Idle, RRC-Idle”. EMM Case 11. Initial Attach in Another City  UE State: “EMM-Deregistered , ECM/RRC-Idle”  “EMM-Registered , ECM/RRC-Connected”  UE A in the state “EMM-Deregistered, ECM Idle, RRC-Idle” enters to the City 2 and detects a new LTE cell.  UE A initiates the Initial Attach procedure by sending an “Attach Request” message to the new MME with GUTI as UE ID.  After successful completion of the Initial Attach procedure, UE A enters the state “EMM-Registered, ECM-Connected, RRC-Connected”. Copyright © 2002-2013 NMC Consulting Group. All rights reserved. 6
  • 7. Netmanias Technical Document: EMM Scenario and Eleven EMM Cases Summary of Eleven EMM Cases Summary of Eleven EMM Cases EMM Case Activity Related LTE Technical Document Initial Attach  Attach of Unknown UE EMM Procedure : 1. Initial Attach for Unknown UE EMM Case 2 Detach  UE-initiated Detach  MME-initiated Detach  HSS-initiated Detach EMM Procedure: 2. Detach EMM Case 3 S1 Release due to User Inactivity  eNB-initiated S1 Release  MME-initiated S1 Release EMM Procedure: 3. S1 Release due to User Inactivity EMM Case 4 Service Request due to New Traffic  UE triggered Service Request  Network triggered Service Request EMM Procedure: 4. Service Request due to New Traffic EMM Case 5 Periodic TAU (Tracking Area Update)  Periodic TAU (Tracking Area Update) EMM Procedure: 5. Periodic TAU EMM Case 6 Handover without TAU  X2 based Handover  S1 based Handover EMM Procedure: 6. Handover without TAU EMM Case 7 Cell Reselection without TAU  Cell Reselection without TAU EMM Procedure: 7. Cell Reselection without TAU EMM Case 8 Handover with TAU  X2 based Handover  S1 based Handover EMM Procedure: 8. Handover with TAU EMM Case 9 Cell Reselection with TAU  Cell Reselection with TAU EMM Procedure: 9. Cell Reselection with TAU EMM Case 10 Move to Another City  Move to Another City EMM Procedure: 10. Move to Another City EMM Case 11 Initial Attach in Another City  Attach in Another City EMM Procedure: 11. Initial Attach for Known UE via Old MME EMM Case 1 Copyright © 2002-2013 NMC Consulting Group. All rights reserved. 7
  • 8. Netmanias Technical Document: EMM Scenario and Eleven EMM Cases References and Abbreviations [1] Netmanias Technical Document, “LTE EMM and ECM State”, February 2013, http://www.netmanias.com/bbs/zboard.php?id=1x_TechdocsForum_4G [2] 3GPP TS 24.301, “Non-Access-Stratum (NAS) Protocol for Evolved Packet System (EPS); Stage 3”. [3] 3GPP TS 23.401, “General Packet Radio Service (GPRS) Enhancements for Evolved Universal Terrestrial Radio Access Network (E-UTRAN) Access“. [4] NMC Consulting Group Report, “E2E LTE Network Design”, August 2010. Abbreviations ECM EMM eNB EPS E-RAB E-UTRAN GPRS GUTI HSS LTE MME NAS PCRF P-GW PLMN : : : : : : : : : : : : : : : EPS Connection Management EPS Mobility Management Evolved Node B Evolved Packet System E-UTRAN Radio Access Bearer Evolved Universal Terrestrial Radio Access Network General Packet Radio Service Globally Unique Temporary Identifier Home Subscriber Server Long Term Evolution Mobility Management Entity Non-Access Stratum Policy and Charging Rule Function Packet Data Network Gateway Public Land Mobile Network Copyright © 2002-2013 NMC Consulting Group. All rights reserved. RRC S-GW SPR TA TAI TAU UE : : : : : : : Radio Resource Control Serving Gateway Subscriber Profile Repository Tracking Area Tracking Area Identity Tracking Area Update User Equipment 8

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