SOURCE ETSI TITLE 3 GPP LTE and SAE

SOURCE: ETSI TITLE: 3 GPP LTE and SAE AGENDA ITEM: Joint 4. 1 CONTACT: Francois. courau@alcatel. fr GSC 11/Joint(06)_32 r 1 3 GPP Long Term Evolution and System Architecture Evolution (LTE and SAE) Francois Courau

3 GPP 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 3 GPP technologies for the future

3 GPP 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

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

3 GPP LTE and SAE • Goal of LTE – Significantly increased peak data rates, scaled linearly according to spectrum allocation • Targets: – Instantaneous downlink peak data rate of 100 Mbit/s in a 20 MHz downlink spectrum (i. e. 5 bit/s/Hz) – Instantaneous uplink peak data rate of 50 Mbit/s in a 20 MHz uplink spectrum (i. e. 2. 5 bit/s/Hz)

3 GPP 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

3 GPP LTE and SAE • Status of the work for LTE – Downlink Parameter for OFDM 1. 25 MHz 2. 5 MHz 10 MHz 15 MHz 20 MHz Transmission BW Sub-frame duration 0. 5 ms Sub-carrier spacing 15 k. Hz Sampling frequency 1. 92 MHz 3. 84 MHz FFT size 128 Number of occupied sub-carriers†, †† 76 (1/2 3. 84 MHz) 7. 68 MHz 23. 04 MHz 30. 72 MHz (4 3. 84 MHz) (6 3. 84 MHz) (8 3. 84 MHz) 256 512 1024 1536 2048 151 301 601 901 1201 Number of OFDM symbols per sub frame (Short/Long CP) CP length 15. 36 MHz (2 3. 84 MHz) 7/6 Short (4. 69/9) 6, (5. 21/10) 1* (4. 69/18) 6, (5. 21/20) 1 (4. 69/36) 6, (5. 21/40) 1 (4. 69/72) 6, (5. 21/80) 1 (4. 69/108) 6, (5. 21/120) 1 (4. 69/144) 6, (5. 21/160) 1 Long (16. 67/32) (16. 67/64) (16. 67/128) (16. 67/256) (16. 67/384) (16. 67/512) (μs/samples )

3 GPP LTE and SAE – Uplink Parameters (Variant including TD SCDMA framing also supported) Transmission BW 1. 25 MHz 2. 5 MHz Timeslot duration 0. 675 ms Sub-carrier spacing 15 k. Hz Sampling frequency 1. 92 MHz 3. 84 MHz FFT size 128 256 Number of occupied sub-carriers†, †† 76 151 7. 68 MHz (2 3. 84 MHz) (1/2 3. 84 MHz) Timeslot Interval (samples) 15 MHz 20 MHz 15. 36 MHz 23. 04 MHz 30. 72 MHz (4 3. 84 MHz) (6 3. 84 MHz) (8 3. 84 MHz) 512 1024 1536 2048 301 601 901 1201 Number of OFDM symbols per Timeslot (Short/Long CP) CP length (μs/samples) 10 MHz 9/8 Short 7. 29/14 7. 29/28 7. 29/56 7. 29/112 7. 29/168 7. 29/224 Long 16. 67/32 16. 67/64 16. 67/128 16. 67/256 16. 67/384 16. 67/512 Short 18 36 72 144 216 288 Long 16 32 64 128 192 256

3 GPP LTE and SAE • Further agreement on LTE – Currently no more macro-diversity • No soft handover required – Security • Control Plane – Ciphering and Integrity provided by e. Node B (BTS) – RLC and MAC provided directly in the e. Node B • User plane – Ciphering and integrity in the e. Access. Gateway functionality

3 GPP LTE and SAE • SAE – Looking at the implications for the overall architecture resulting from: – 3 GPP’s (Radio Access Network) LTE work – 3 GPP All-IP Network specification (TS 22. 978) – the need to support mobility between heterogeneous access networks

3 GPP 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-3 GPP 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

3 GPP LTE and SAE Architecture (work in progress)

3 GPP 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

3 GPP LTE and SAE • Recent addition to the 3 GPP 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