LTE Rel8 RRC Protocol 2011 07 15 Young

LTE Rel-8 RRC Protocol 2011. 07. 15 Young. Dae Lee: youngdae. lee@lge. com Copyright Notification . No part may be reproduced except as authorized by written permission. The copyright and the foregoing restriction extend to reproduction in all media. ⓒ 2011. LG 3 GPP RAN 2 team. All rights reserved. LG Electronics RAN 2 Team

Fundamental of Radio Resource Control NAS message delivery RRC Mobility Control Measurement Control … RRC messages PDCP configuration per RB PDCP RLC configuration per RB RLC • Antenna Configuration • Configuration of physical channels … MAC • Random access parameters • UL SCH configuration … PHY LG Electronics RAN 2 Team

Signaling Radio Bearers Message Types Logical Channel Types Radio Bearer Types By specified configuration By RRC connection (re)establishment By RRC connection reconfiguration SRB 0 CCCH RRC messages SRB 1 Only before SRB 2 is established NAS Messages * DCCH SRB 2 * In Rel-10, UE Information Response message including logged measurement report for MDT is exceptionally carried over SRB 2 as a RRC message not carrying NAS information. LG Electronics RAN 2 Team

Journey of RRC procedures RRC Connection Establishment Proc. SRB 1 established, to RRC_CONNECTED Cell selection Select a suitable EUTRA cell System Information Acquisition Proc. Security Activation Proc. Ciphering & Integrity activated RRC Reconfiguration Proc. SRB 2 & DRB(s) established, UE specific configurations Radio Link Failure Detection All RBs except SRB 0 suspended RRC Connection Reestablishment Proc. Possibly other cell than serving cell, Obtain SRBs & DRBs resumed system information Handover Proc. Access to another cell RRC Reconfiguration Proc. UE specific configurations Measurement Serving and neighboring cells Measurement Report Measurement result Connection Release Proc. SRBs, DRBs released, to RRC_IDLE LG Electronics RAN 2 Team

Functions of RRC System information delivery RRC connection control • Paging • Access Class Barring • Establishment/modification/release of RRC connection • Initial security activation • Intra-LTE mobility • Qo. S control • Recovery from radio link failure; Inter-RAT mobility Measurement Generic protocol error handling Support of self-configuration and self-optimisation LG Electronics RAN 2 Team

System Information Broadcast I got a cell reselection info. for idle mode Oh my god! I’m reading emergency warning info. System Information I got essential physical layer configurations to access this cell I’m checking if this cell can be accessible I obtain common configurations to apply for this cell LG Electronics RAN 2 Team

System Information Structure Fixed scheduling Dynamic scheduling SIB 2 • Access class barring information • Cell specific radio resource configuration info. • MBSFN allocation info. • UL frequency / UL bandwidth MIB • Essential physical layer information (e. g. DL bandwidth) SIB 3 BCCH/BCH • Common cell re-selection parameters SIB 4/5 • Intra/Inter frequency reselection parameters SIB 1 • Cell access related information • Scheduling information of other SIBs • Value tag SIB 6/7/8 • Inter-RAT reselection parameters SIB 9 • HNB name SIB 10/11/12 • ETWS information, CMAS information BCCH/DL SCH SIB 13 • MBMS control information LG Electronics RAN 2 Team

Scheduling of System Information A SIB is included in one SI message Mapping SIBs onto SIs is flexible Information blocks MIB SIB 1 Fixed mapping SIB j SIB n SIB k SIB m … Flexible mapping RRC messages MIB Fixed Period 40 ms SIB 1 Fixed Period 80 ms SI 2 Configurable Period x SI 3 Configurable Period y … For instance, Period x = 160 ms, Period y = 640 ms LG Electronics RAN 2 Team

System Information Validity Value Tag in SIB 1 Value tag=n+1 • 5 bits value tag • UE checks value tag e. g. upon recovery from out of coverage Modification Period Concept BCCH modification period(n) BCCH modification period(n+1) Modification indication Updated information Sent via Paging message LG Electronics RAN 2 Team

Usage of Paging Message Oh! I got a call Page one or more UEs Paging Oh, my God! Emergency!! Notification of Warning messages System Info. Change Notification something new in system information LG Electronics RAN 2 Team

Triggering of Connection Establishment Mobile Originating call Get my call! Establishment Cause RRC Connection establishment Service Request e. NB Service Request Core Network Establishment Cause Mobile Terminating Call I got a call Paging RRC Connection establishment e. NB LG Electronics RAN 2 Team

RRC Connection Establishment UE NAS UE L 2/L 1 UE RRC e. NB Service Request Access Barring check If not barred RRCConnection. Request SRB 0 - Establishment Cause - UE identity Random Access Preamble Random Access Response RRCConnection. Request Admission Control RRCConnection. Setup SRB 0 SRB 1 setup - Service Request RRCConnection. Setup Complete SRB 1 RRCConnection. Setup Complete LG Electronics RAN 2 Team

Access Class Barring Access Classes In USIM One AC randomly allocated 0 1 9 One or more Special AC 11 12 Emergency 15 10 System Information AC barring for Emergency MT Call No AC barring for MO signalling ACB for emergency= TRUE Yes Zero Flag for Special AC? Wait timer is running? Yes AC barring for MO data Wait timer is running? No No Zero Flag for Special AC? Barred No Yes No No Yes Lower than Barring factor Yes Not barred LG Electronics RAN 2 Team

Initial Security Activation and RB Establishment MME e. NB Service Request Security Mode Command (Integrity Protection only) SMC IP verification Security Activation RRC Connection Reconfiguration Security Mode Complete Initial Context Setup Request - Security - E-RAB to Be Setup - Qo. S - UE capability (Integrity Protection only) SRB 2 / DRB Setup RRC Connection Reconfiguration Complete Initial Context Setup Response Data Transmissions over DRBs LG Electronics RAN 2 Team

Intra-EUTRA Handover procedure Network controlled mobility Target e. NB Source e. NB RRC Connection Reconfiguration (Measurement Config) Measurements 1. Look at this. I need a handover to there Measurement Report HO Decision 4. Go there!. Good luck~! 2. This is configuration info for the UE. Could you accept handover? HO request Ack (HO command) HO command 3. OK. Let her use this configuration at handover Hard Handover 5. Handover completed Random Access HO complete LG Electronics RAN 2 Team

Measurement Configuration When and what should I report? What should I measure? Frequency Serving cell LTE carrier frequency 1 Intra-freq measurement Neighboring cell Serving cell LTE carrier frequency 2 Inter-freq measurement UMTS cell 1 UMTS cell 2 Inter-RAT measurement Measurement Object Measurement Identities Event occurs Reporting Configuration Measurement Configuration in RRC Connection Reconfiguration Message LG Electronics RAN 2 Team

Measurement Configuration ID 0 Measurement object #0 ID 1 Measurement object #1 ID 3 ID 2 Measurement object #2 Reporting Configuration #0 Reporting Configuration #1 Reporting Configuration #2 Applicable cells I am on this cell Reporting Criteria This cell is part of measurement objects I found this cell Serving cell result Evaluation of Reporting Criteria Neighboring cell result E-UTRAN A 1 UTRAN CDMA 2000 Threshold 2 GERAN Threshold 1 Serving Cell Listed Cells Detected Cells Measurement Report (meas ID, meas Results) Intra-LTE events A 2 A 3 A 4 A 5 Offset B 2 B 1 Inter-RAT events LG Electronics RAN 2 Team

RRC Connection Re-establishment Something is wrong! I need recovery. Source e. NB Suspend all RBs except SRB 0 Cell Selection Prepared Cell RRC Connection Failure Detection Target e. NB (Valid UE Context) Out-of-synch, HO failure, Reconfig failure, RA failure, RLC failure … UE based mobility System Information Random Access - UE identity - Reestablishment Cause Resume SRB 1 RRC Connection Reestablishment Request SRB 0 Accept RRC Connection Reestablishment SRB 0 Security Reactivation RRC Connection Reestablishment Complete SRB 1 LG Electronics RAN 2 Team

Inter-RAT Mobility To E-UTRA • Handover from GERAN or UTRAN to E-UTRA - RRC Connection Reconfiguration message is sent via another RAT - Same as intra-EUTRA handover procedure • Mobility from CDMA 2000 to E-UTRA - Connection establishment to a target cell of E-UTRA (after attach to EPC via CDMA 2000) Mobility From E-UTRA • Handover from E-UTRA to GERAN, UTRAN or CDMA 2000 • Cell Change Order to GERAN - Connection establishment to a target cell of GERAN after ‘Mobility. From. EUTRA’ • Preregistration / HO preparation to CDMA 2000 CN before HO execution LG Electronics RAN 2 Team

Mobility to E-UTRA HO: GERAN to LTE GERAN RRC Connection Reconfiguration LTE RRC Connection Reconfiguration Complete HO: UMTS to LTE UMTS RRC Connection Reconfiguration LTE RRC Connection Reconfiguration Complete CDMA 2000 to LTE CDMA 2 000 Attach to EPC LTE RRC Connection Request LG Electronics RAN 2 Team

Mobility from E-UTRA HO: E-UTRA to GERAN LTE Mobility from EUTRA Cmd (HO) GERAN HO Access HO: E-UTRA to UMTS LTE Mobility from EUTRA Cmd (HO) CCO: E-UTRA to GERAN UMTS LTE Mobility from EUTRA Cmd (CCO+SI) GERAN Channel Request HO: E-UTRA to CDMA 2000 CDMA 2 000 LTE HO to UTRAN Complete Preregistration & HO preparation to CDMA 2000 CN Mobility from EUTRA Cmd (HO) Traffic Channel Complete LG Electronics RAN 2 Team

Inter-RAT Handover from E-UTRA Source e. NB Target RAN CN HO Decision HO Required Relocation Request - Security - Bearers to Be Setup - Qo. S Relocation Req ACK - HO Command Mobility from E-UTRA Command HO Command Random Access HO complete LG Electronics RAN 2 Team

Inter-RAT Handover to E-UTRA Source RAN Target e. NB CN HO Decision Relocation Required HO Request - Security - E-RAB to Be Setup - Qo. S HO Request ACK - RRC Connection Reconfiguration HO Command - RRC Connection Reconfiguration Relocation Command - RRC Connection Reconfiguration Random Access HO complete LG Electronics RAN 2 Team