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

GSC11/Joint(06)_32r1. 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

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  1. GSC11/Joint(06)_32r1 3GPP Long Term Evolution and System Architecture Evolution (LTE and SAE)Francois Courau GSC: Standardization Advancing Global Communications

  2. 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

  3. 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

  4. 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 (including 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

  5. 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

  6. 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

  7. 3GPP LTE and SAE • Status of the work for LTE • Downlink Parameter for OFDM GSC: Standardization Advancing Global Communications

  8. 3GPP LTE and SAE • Uplink Parameters (Variant including TD SCDMA framing also supported) GSC: Standardization Advancing Global Communications

  9. 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

  10. 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

  11. 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 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 • Migration scenarios GSC: Standardization Advancing Global Communications

  12. 3GPP LTE and SAE Architecture (work in progress) GSC: Standardization Advancing Global Communications

  13. 3GPP LTE and SAE • In the Core network: • In addition to IMS services available in the current system, equivalent CS Services may be provided by IMS core since CS domain is not supported in LTE • Mobility Management Entity and User Plan Entity might be collocated in the Access Gateway entity but this is still an open point • Reduced number of nodes in the evolved packet core may be achieved compared to current architecture to provide connectivity to IMS GSC: Standardization Advancing Global Communications

  14. 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, but has constraints in terms of support for legacy terminals and HW changes). • The feasibility is first under investigation GSC: Standardization Advancing Global Communications

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