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GSC11/Joint(06)32. 3GPP Long Term Evolution and System Architecture Evolution (LTE and SAE) Francois Courau. 3GPP LTE and SAE. LTE focus is on: enhancement of the Universal Terrestrial Radio Access (UTRA) optimisation of the UTRAN architecture

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3gpp long term evolution and system architecture evolution lte and sae francois courau

GSC11/Joint(06)32

3GPP Long Term Evolution and System Architecture Evolution (LTE and SAE)Francois Courau

GSC: Standardization Advancing Global Communications

3gpp lte and sae
3GPP LTE and SAE
  • LTE focus is on:
    • enhancement of the Universal Terrestrial Radio Access (UTRA)
    • optimisation of the UTRAN architecture
  • With HSPA (downlink and uplink), UTRA will remain highly competitive for several years
  • LTE project aims to ensure the continued competitiveness of the 3GPP technologies for the future

GSC: Standardization Advancing Global Communications

3gpp lte and sae1
3GPP LTE and SAE
  • SAE focus is on:
    • enhancement of Packet Switched technology to cope with rapid growth in IP traffic
      • higher data rates
      • lower latency
      • packet optimised system
    • through
      • fully IP network
      • simplified network architecture
      • distributed control

GSC: Standardization Advancing Global Communications

3gpp lte and sae2
3GPP LTE and SAE
  • Reminder of LTE objectives
    • Demand for higher data rates
    • Expectations of additional 3G spectrum allocations
    • Greater flexibility in frequency allocations
    • Continued cost reduction
    • Keeping up with other (unlicensed) technologies (eg WiMAX)
    • Growing experience with the take-up of 3G is helping to clarify the likely requirements of users, operators and service providers in the longer term

GSC: Standardization Advancing Global Communications

3gpp lte and sae3
3GPP LTE and SAE
  • Goal of LTE
    • Significantly increased peak data rates, scaled linearly according to spectrum allocation
  • Targets:
    • Instantaneous downlink peak data rate of 100Mbit/s in a 20MHz downlink spectrum (i.e. 5 bit/s/Hz)
    • Instantaneous uplink peak data rate of 50Mbit/s in a 20MHz uplink spectrum (i.e. 2.5 bit/s/Hz)

GSC: Standardization Advancing Global Communications

3gpp lte and sae4
3GPP LTE and SAE
  • Latency issue
    • Control-plane
      • Significant reductions in transition times from idle or dormant states to active state
    • User-plane
      • Radio access network latency below less than 5 ms in unloaded condition (ie single user with single data stream) for small IP packet
  • Latency also being addressed in SAE

GSC: Standardization Advancing Global Communications

3gpp lte and sae5
3GPP LTE and SAE
  • Status of the work for LTE
    • Downlink Parameter for OFDM

GSC: Standardization Advancing Global Communications

3gpp lte and sae6
3GPP LTE and SAE
  • Uplink Parameters (Variant including TD SCDMA framing also supported)

GSC: Standardization Advancing Global Communications

3gpp lte and sae7
3GPP LTE and SAE
  • Further agreement on LTE
    • Currently no more macro-diversity
      • No soft handover required
    • Security
      • Control Plane
        • Ciphering and Integrity provided by eNode B (BTS)
        • RLC and MAC provided directly in the eNode B
      • User plane
        • Ciphering and integrity in the eAccessGateway functionality

GSC: Standardization Advancing Global Communications

3gpp lte and sae8
3GPP LTE and SAE
  • SAE
    • Looking at the implications for the overall architecture resulting from:
    • 3GPP’s (Radio Access Network) LTE work
    • 3GPP All-IP Network specification (TS22.978)
    • the need to support mobility between heterogeneous access networks

GSC: Standardization Advancing Global Communications

3gpp lte and sae9
3GPP LTE and SAE
  • SAE
    • Achieving mobility within the Evolved Access System
    • Implications of using the evolved access system on existing and new frequency bands
    • Will the Evolved RAN need to be connected to the legacy PS core?
    • Adding support for non-3GPP access systems
    • Inter-system Mobility with the Evolved Access System
    • Roaming issues, including identifying the roaming interfaces
    • Inter-access-system mobility
    • Policy Control & Charging
    • How does User Equipment discover Access Systems and corresponding radio cells? Implications of various solutions on User Equipment, e.g. on battery life
    • Implications for seamless coverage with diverse Access Systems

GSC: Standardization Advancing Global Communications

3gpp lte and sae10
3GPP LTE and SAE
  • SAE architecture

MME – Mobility Management Entity UPE – User Plane Entity

AS – Access System

Red indicates new functional element / interface

From TR 23.882

GSC: Standardization Advancing Global Communications

3gpp lte and sae11
3GPP LTE and SAE
  • In the Core network:
    • Services are provided by IMS core
    • One node to provide the SGSN and GGSN functionality
    • Mobility Management Entity and User Plan Entity might be collocated in the Access Gateway entity but this is still an open point
    • Full architecture provided with two nodes IMS

GSC: Standardization Advancing Global Communications

3gpp lte and sae12
3GPP LTE and SAE
  • Recent addition to the 3GPP Work plan
    • During the last meetings a new study has been initiated to work on evolution of HSPA called HSPA+ looking a further improvement of the HSPA (HSDPA and HSUPA) and potentially being connected to the SAE.
      • This could re-use most of the work underway in LTE in terms of improvement for latency (protocol evolution and functional split). The feasibility isy first under investigation

GSC: Standardization Advancing Global Communications