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

3GPP Long Term Evolution (LTE) and System Architecture Evolution (SAE). Stephen Hayes TSG SA Chairman stephen.hayes@ericsson.com. Introduction. 3GPP Overview and Status Radio Evolution (LTE) Overview and Status Network Evolution (SAE) Overview and Status. What is 3GPP?. Japan. USA.

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

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  1. 3GPP Long Term Evolution (LTE) and System Architecture Evolution (SAE) Stephen Hayes TSG SA Chairman stephen.hayes@ericsson.com

  2. Introduction • 3GPP Overview and Status • Radio Evolution (LTE) Overview and Status • Network Evolution (SAE) Overview and Status

  3. What is 3GPP? Japan USA • 3GPP stands for 3rd Generation Partnership Project • It is a partnership of 6 regional SDOs • These SDOs take 3GPP specifications and transpose them to regional standards • ITU references the regional standards

  4. TSG GERAN GSM EDGE Radio Access Network TSG RAN Radio Access Networks TSG SA Services & System Aspects GERAN WG1 Radio Aspects RAN WG1 Radio Layer 1 specification SA WG1 Services GERAN WG2 Protocol Aspects RAN WG2 Radio Layer2 spec & Radio Layer3 RR spec SA WG2 Architecture GERAN WG3 Terminal Testing GERAN WG3 Terminal Testing RAN WG3 lub spec lur spec lu spec &UTRAN O&M requirements SA WG3 Security RAN WG4 Radio Performance &Protocol Aspects SA WG4 Codec RAN WG5 (ex T1) Mobile TerminalConformance Testing SA WG5 Telecom Management Structure of 3GPP Project Co-ordination Group (PCG) TSG CT Core Network& Terminals CT WG1 (ex CN1) MM/CC/SM (lu) CT WG3 (ex CN3) Interworking with External Networks CT WG4 (ex CN4) MAP/GTP/BCH/SS CT WG5 (ex CN5) OSAOpen Service Access CT WG6 (ex T3) Smart CardApplication Aspects

  5. Rel 99 Rel 6 Rel 5 Rel 4 3GPP Release Timeline HSDPA HSUPA HSPA+ WCDMA MMS MBMS FBI IMS MSC Split I-WLAN Rel 7 (target) 2007 2008 1999 2000 2001 2002 2003 2004 2005 2006

  6. 3G Evolution • Radio Side (LTE – Long Term Evolution) • Improvements in spectral efficiency, user throughput, latency • Simplification of the radio network • Efficient support of packet based services: MBMS, IMS, etc. • Network Side (SAE – System Architecture Evolution) • Improvement in latency, capacity, throughput • Simplification of the core network • Optimization for IP traffic and services • Simplified support and handover to non-3GPP access technologies

  7. Evolution of 3GPP Radio Rates

  8. LTE (Long Term Evolution) • 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

  9. LTE Requirements (1) • Reduced cost per bit • Improve spectrum efficiency ( e.g. 2-4 x Rel6) • Reduce cost of backhaul (transmission in UTRAN) • Increased service provisioning – more services at lower cost with better user experience • Focus on delivery of services utilising ”IP” • Reduce setup time and round trip time • Increase the support of QoS for the various types of services (e.g. Voice over IP) • Increase “cell edge bit rate” whilst maintaining same site locations as deployed today • Increase peak bit rate (e.g. above 100Mbps DL and above 50Mbps UL) • Enhance the bit rate for MBMS (e.g. 1-3 Mbps) • Allow for reasonable terminal power consumption

  10. LTE Requirements (2) • Flexibility of use of existing and new frequency bands • Allow to deploy in wider and smaller bandwidths than 5 MHz ( e.g. ranging from 1.25 to 20MHz) • Allow variable duplex technology within bands as well as between bands • Non-contiguous spectrum allocations to one UE should not be precluded

  11. LTE Requirements (3) • Architecture and Mobility • Need to consider UTRAN Evolution and UTRA Evolution at the same time aiming at simplifying the current architecture • Shall provide open interfaces to support Multi-vendor deployments • Consider robustness – no single point of failure • Support multi-RAT with resources controlled from the network • Support of seamless mobility to legacy systems as well as to other emerging systems including inter RAT Handovers and Service based RAT Selection • Maintain appropriate level of security

  12. LTE Key agreements (1) • 2 main issues have been investigated: • The physical layer • The access network internal architecture • Physical layer • Downlink based on OFDMA • OFDMA offers improved spectral efficiency, capacity etc • Uplink based on SC-FDMA • SC-FDMA is technically similar to OFDMA but is better suited for uplink from hand-held devices • (battery power considerations) • For both FDD and TDD modes (User Equipment to support both) • With Similar framing + an option for TD SCDMA framing also • Access Network consideration • For the access network it was agreed to get rid of the RNC which minimized the number of nodes

  13. LTE Architecture Evolved Packet Core MME/UPE = Mobility Management Entity/User Plane Entity eNB = eNodeB

  14. LTE Key agreements (2) • On the UTRAN Architecture the following working assumptions were agreed in TSG RAN: • RRC Terminates in the eNode B • Outer ARQ terminates also in the eNode B • Currently Ciphering and integrity for signaling is inside the eNode B while Ciphering for the User plane is in the AGW

  15. LTE Key agreements (3) • Requirements satisfaction • The LTE concept has the potential to fulfil both the system capacity and user throughput targets • Evaluated uplink peak data rate is a bit smaller than the requirements, however, it is expected that the peak data rate can be increased by some optimisations, e.g. higher TTI values and/or by reducing the amount of control signalling information. • It was confirmed that the requirements of C-plane and U-plane latency can be satisfied. • Fulfilments without any issues are identified for requirements on deployment scenarios, spectrum flexibility, interworking, mobility, E-UTRAN architecture and RRM.

  16. LTE Key agreements (4) • Regarding system and device cost and complexity work needs to continue in the future. As evolved UTRA and UTRAN system will provide significantly higher data rates than Release 6 WCDMA and, as a consequence hereof, the physical layer complexity will increase accordingly compared to lower-rate systems. This complexity is not seen as evolved UTRA and UTRAN specific, but is similar to the complexity experienced in any high data rate system. • According to these evaluation results, it can be concluded that system concepts captured in this TR are feasible for evolved UTRA and UTRAN. • For Broadcast/Multicast services it is assume that network synchronization will improve greatly the performance

  17. Time schedule for LTE • LTE plan endorsed by 3GPP Project Co-ordination Group • Initial studies and work-plan creation to was almost completed in June 2006: • Generic Work Item created during the June meeting of TSG RAN • LTE Workplan created in September 2006 • Completion foreseen in 2008

  18. SAE (System Architecture Evolution) • To ensure competitiveness of 3GPP systems for the next 10 years and beyond • Optimization of the network for IP traffic and its expected growth • Performance improvements • reduced latency, • higher user data rates, • improved system capacity and coverage, and reduced overall cost for the operator. • Potential network and traffic cost reduction • Flexible accommodation and deployment of existing and new access technologies with mobility by a common IP-based network

  19. 3GPP SAE – status • Large number of active companies (30+) • Reasonable progress on 3GPP parts (including LTE support) • As of October 2006, SA has given a directive to SA2 to ensure that LTE 3GPP access aspects can meet the time line required by 3GPP RAN • Some Key areas being addressed – agreements remaining • MME-UPE split or merged • 3GPP anchor-SAE anchor split or merged • Interconnection/mobility for non-3GPP access technologies • Roaming aspects • PCC architecture & QoS model • Simultaneous access to multiple data networks • Timeline • Report to be ready for SA plenary approval Dec 2006 • Majority of Specifications to be ready end 2007/early 2008 • First deployments planned for 2009

  20. LTE/SAE time plan SA have drafted an overall SAE/LTE work plan to align the time schedules of all applicable Working Groups 2006 2007 2008 #33 #34 #37 #39 #35 #36 #38 Study Item Stage 1 Work Item Stage 2 Work Items LTE parts Non-LTE Stage 3 Work Items LTE parts Non-LTE parts

  21. Summary • Extensive work ongoing to ensure future competiveness of 3G systems • Improved performance • Simplified architecture • Optimized for IP traffic and services • Support for non-3GPP access technologies • Completion targeted in 2008 • Study phase completing, specification phase starting • Further information at 3GPP web site (www.3gpp.org) • LTE requirements study: 25.913 • LTE architecture study: 25.912 • SAE architecture study: 23.882

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