LTE - Multi RAT

• OFDMA and the Time-Frequency Grid (Resource Blocks and Resource Elements)
• Physical Channels and Reference Signals (Pilots)
• Uplink and downlink Resource Allocation via PDCCH
• Master Control Channel - PDCCH Decoding
• Physical Layer Procedures: Cell Search, Random Access and Neighbor Measurements

Topology Overview of EPS and legacy Networks

• EPS Architecture (E-UTRAN and EPC)
  EPS and Interworking with legacy 3GPP RAN/Core
  EPS NAS and E-UTRAN and Core Identities

EPS NAS & CN Signaling

• EPS Protocol Stack with CSFB and SMS
• NAS Integrity Protection and Ciphering
• Access Stratum Integrity Protection and Ciphering (RRC)
• EPS Attach Scenario with Default EPS Activation
• Example for Dedicated EPS Bearer Activation
  • VoIP-IMS Call Setup through SIP Signaling
• TA List Concept & Paging in EPC for PS-Services (incl. VoIP)

RRC Signaling in LTE

• Differences between UMTS RRC and LTE
  
  • RRC States, Number of SRB's and their Purpose
    
  • RRC Establishment and Re-establishment in E-UTRAN
    
• Layer 1 and Layer 2 Drop in LTE
  
• Measurement Control and Reporting
  
  • Measurement Gap versus Compressed Mode
    
  • Physical Layer Measurements
    
    • RSSI, RSCP, Ec/No, RSRP, RSRQ
      
• RRC Connection Reconfiguration
  
  • SRB's and /or Data Radio Bearer (Re-) configuration
    
  • Measurement Control for iRAT measurements
    
  • Handover Command for IRAT changes
    
• System Information Broadcast, Scheduling of SI's
  
• RRC's fixed Procedure Delays
  
• SON (Self Optimizing Network
  
  • Automatic Neighbor Discovery Function
    
  • Black and White Neighbor list

UE's Idle Mode behavior in Multi-RAT mode

• PLMN/Cell Selection and Reselection within 3GPP
  
  • PLMN Selection, Network Sharing
    
  • UE Behavior in CSG environment
    
    • Detection, Identification (also Ignoring if feature not supported) and Camping on CSG cells
      Note: The UE must operate in an environment that includes CSG cells. Therefore it is required to be able to detect, identify and ignore CSG cells as described in Annex B.2 of 36.331. However, with the imminent introduction of ‘re-selection to CSG cell’ conformance test cases may become mandatory very soon unless there is the option of the UE not to support these test cases).
      
  • Cell Selection Criteria for GSM, UMTS and LTE
    
  • Cell Reselection Criteria for GSM, UMTS and LTE
    
    • Note: without HCS in UMTS
      
  • Priority-based Neighbor-search & Reselection between LTE, UMTS and GSM
    
    • Note: Common and Dedicated Priorities (for re-selection) including the rules of switching between common & dedicated and when to delete the dedicated. How is the scenario handled where 1 RAT appears at multiple priorities with another RAT at intermediate priorities? Is it allowed?
      
  • Network Control of Cell Reselection, Redirection of UE to other RAT's
    
• Idle Mode Mobility within 3GPP
  
  • Inter-RAT Tracking/Routing Area Update Procedures
    
  • Idle Mode Signaling Reduction (ISR), LAC/RAC Harmonization in 2G/3G
    
  • The ‘TIN’ Concept and Mapping between GUTI and PTMSI/RAI
    
  • Location/Routing Area Update within different NMO's in GERAN and UTRAN (e.g. NOM-1, 2, and 3; whereas NMO-3 is only applicable to GSM/EGPRS)
    
    • Review of combined ATTACH and combined ROUTING AREA UPDATE procedures
      
  • Usage of Subscriber Profile Id for RAT/Frequency Priority (SPID)
    
  • Conversion between EPS and non-EPS Security Contexts
    
• Layer 1 Measurements of the “other” RAT's in Idle and Connected Mode
  
  • Detection, Identification and Tracking of IRAT Neighbors (GSM, UMTS) in Idle and Connected Mode [refer here to 36.133, 25.133 and for GERAN 44.018]
    
  • UE in LTE-idle: UMTS Cell Search and max Detection (time)
    
  • UE in LTE-idle: GSM Cell Search and max Detection (time)
    
  • UE in LTE-Connected: UMTS Cell Search and max Detection (time) within Measurement Gap
    
  • UE in LTE-Connected: GSM Cell Search and max Detection (time) within Measurement Gap
    
  • Differences in performance requirements between GSM and UMTS measurements (when in LTE-Idle or LTE-connected)
    
    • Measurements using Measurement Gaps; Measurements using DRX 'Gaps', Measurements with 'autonomous Gaps';

PS Interworking

• PS Handover/Relocation between E-UTRAN and UTRAN/GERAN
  
  • Handover from E-UTRAN to UTRAN and vice versa
    
    • Difference in the procedures between S4-SGSN and pre-Release 8 SGSN connecting via Gn/Gp to MME
      
  • Handover from E-UTRAN to GERAN and vice versa
    
    • Rel. 6 PS Handover Support required in GERAN
      
• NACC and Cell Change Order between E-UTRAN and GERAN
  
  • Note that there is no NACC from UTRAN to E-UTRAN
    
  • RIM Information Management
    
  • NACC from E-UTRAN to GERAN and vice versa
    
• Redirections from LTE to GERAN or LTE to UTRAN
  
• Conversion between EPS QoS and Rel. 99 QoS (non-EPS QoS) Attributes
  
  • EPS and PDP Context Preservation during IRAT Changes/Handover's
    
  • IP address maintained at Inter-RAT HO and Reselections;
    
  • Bearer Transfer between the RAT's

CS Interworking Solutions

• UE Modes of Operation in LTE
  
  • EPS Services vs non-EPS Services
    
  • PS Mode 1 and 2 versus CS/PS Mode 1 and 2
    
    • Voice centric or Data centric Device; EPS Combined ATTACH and Combined ROUTING AREA UPDATE procedure (to EPS and non-EPS Services (~ legacy circuit-switched services like SMS and AMR-voice)
      
• CSFB Procedures and Interworking with ISR
  
  • Combined Attach and Tracking Area Update vs. Combined Routing Area Update and Location Area Update
    
  • Various Types of CSFB methods: CCO, NACC, PS-Handover (to UTRAN or EGPRS), RRC Connection
    • Release with 'Redirection Info for other RAT'
      Redirection of UE from LTE (Idle and Connected mode) to GERAN or UTRAN with SIB's
      Note: The “with SIB's is a Rel.9 enhancement to the signaling.
      
  • MTC in LTE-Idle and LTE-Connected Mode
    
  • MOC in LTE-Idle and LTE-Connected Mode
    
• SMS in EPS
  
  • SMS over SGs-interface
    
    • Prerequisite: Combined Attach / Tracking Area Update for EPS and non-EPS Services
      
  • SMS over IP-IMS
    
• Single Radio Voice Call Continuity (SRVCC) Procedure
  
  • Handover Message Flows
    
    • E-UTRAN to UTRAN SRVCC, E-UTRAN to GERAN SRVCC
      
• Emergency Call Handling in LTE
  
  • With USIM and SIMless
    
• VoLGA Overview

Changes and Amendments in Rel. 9

• GERAN in Rel. 9
  
  • Differences to Rel. 8 in terms of NAS and RRC
    
• UTRAN in Rel. 8
  
  • Differences to Rel. 8 in terms of NAS and RRC
    
• E-UTRAN in Rel. 9
  
  • Differences to Rel. 8 in terms of NAS and RRC

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