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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. 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)32 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 (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 • 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

  12. 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

  13. 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

  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). The feasibility isy first under investigation GSC: Standardization Advancing Global Communications

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