LTE Protocols and Procedures - additional materials

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Here are some additional materials from LTE Protocols and Procedures course delivered in February 2013 in Warsaw, Poland.

Are you interested in attending top in class LTE/LTE-Advanced courses, please have a look on our course portfolio at: http://is-wirelesstraining.com/trainings or contact us directly: sales@is-wireless.com.

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LTE Protocols and Procedures - additional materials

  1. 1. LTE Protocols and Procedures Additional Materials
  2. 2. LTE Channel Architecture Radio Bearer Type to Logical Channel Mapping Common signalling Dedicated signalling Data – dedicated links SRB1 – Prior to security SRB0 SRB0 SRB0 SRB2 – after secrutity DRB DRB SRB2 Radio Bearers PDCP Ciphering and Integrity Ciphering and RoHC RLC ARQ BCCH PCCH CCCH DCCH MCCH MTCH DTCH Logical ChannelsCopyright by IS-Wireless. All rights reserved. www.is-wireless.com
  3. 3. LTE RRC Procedure PHY Channels Included: Connection Establishment UE finds the opportunity for RRC IDLE PRACH transmission eNB and chooses the RA Preamble PRACH: RA Preamble eNB calculates RA-RNTI UE decodes PDCCH to read allocation given to RA-RNTI PDCCH: DL Allocation UE reads the UL allocation in PDSCH: RA Response PUSCH and allocated C-RNTI PDCCH: UL Allocation eNB authenticates user by S-TMSI PUSCH: RRC Connection Request UE decodes PHICH and PDCCH to read allocation given PHICH: HARQ-ACK to C-RNTI PDCCH: DL Allocation UE authenticates itself by PDSCH: RRC Connection Setup reading ping-ponged S-TMSI, enters RRC-Connected state and configures lower layers PUCCH: HARQ-ACK eNB forwards the first NAS PDCCH: UL Allocation message towards selected MME UE decodes PDCCH to read allocation given to C-RNTI or chooses it randomly if not specified by UE PUSCH: RRC Connection Setup Complete PHICH: HARQ-ACK UE selects MME and transmits the first NAS message within RRC message RRC Connected t tCopyright by IS-Wireless. All rights reserved. www.is-wireless.com
  4. 4. Scheduling Request Procedure UE Requesting Uplink Scheduling Grant (UL Grant Required) Start User can be in RRC_Connected state, thus receiving DL data, but have no or too little UL resources Data Occured in UL Buffer SR Pending N Y PUSCH resources available? N Y RAP Pending PUCCH resources available? Random Access Procedure N Y Random Access Response? Send SR on PUCCH N Y UL Data Transmission on UL Grant on PUSCH? PUSCH StopCopyright by IS-Wireless. All rights reserved. www.is-wireless.com
  5. 5. LTE Data Flow Example EPS Bearer 1 packet n EPS Bearer 1 packet n+1 EPS Bearer 2 packet n IP IP IP Payload Payload Payload header header header Header Payload Payload Payload compression Ciphering PDCP PDCP PDCP PDCP SDU PDCP SDU PDCP SDU header header header PDCP RLC SDU RLC SDU RLC SDU Segmentation concatenation RLC RLC RLC header header header RLC Multiplexing MAC MAC MAC SDU MAC SDU header header MAC AMC Transport Block CRC Transport Block CRC PHYCopyright by IS-Wireless. All rights reserved. Variable sizes (one TB per TTI) www.is-wireless.com
  6. 6. E-UTRAN and EPC Protocol Stacks End-to-End Control Plane 3GPP IETF Protocol Protocol Control Plane NAS NAS GTP-C GTP-C GTP-C GTP-C RRC RRC S1-AP S1-AP PDCP PDCP SCTP SCTP UDP UDP UDP UDP RLC RLC IP IP IP IP IP IP MAC MAC L2 L2 L2 L2 L2 L2 PHY PHY PHY PHY PHY PHY PHY PHY Uu S1-MME S11 S5/S8 MME SGW PGW eNBCopyright by IS-Wireless. All rights reserved. www.is-wireless.com
  7. 7. E-UTRAN and EPC Protocol Stacks End-to-End User Plane 3GPP IETF Protocol Protocol User Plane Application Application IP IP IP PDCP PDCP GTP-U GTP-U GTP-U GTP-U L2 L2 RLC UDP/IP UDP/IP UDP/IP UDP/IP RLC MAC MAC L2 L2 L2 L2 L1 L1 PHY PHY PHY PHY PHY PHY Uu S1-U S5 SGi SGW PGW App. Server eNBCopyright by IS-Wireless. All rights reserved. www.is-wireless.com
  8. 8. HO TimersHOF and RLF Related Timers RLF Related Timer 3GPP TS 36.331: RRC, Section 7.3 Timers Reception of RRCConnectionReconfiguration message including the T304 MobilityControl Info or reception of MobilityFromEUTRACommand message including CellChangeOrder HOF Related 3GPP TS 36.423: X2-AP, Section 9.5 Timers Timer Specifies the maximum time for the protection of the overall handover TX2RELOCoverall procedure in the source eNBCopyright by IS-Wireless. All rights reserved. www.is-wireless.com

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