GSC: Standardization Advancing Global Communications 3GPP Long Term Evolution and System Architecture Evolution (LTE and SAE) Francois Courau SOURCE:ETSI TITLE:3GPP LTE and SAE AGENDA ITEM:Joint 4.1 GSC11/Joint(06)32

GSC: Standardization Advancing Global Communications 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 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 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 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 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 SAE Status of the work for LTE –Downlink Parameter for OFDM Transmission BW 1.25 MHz2.5 MHz5 MHz10 MHz15 MHz20 MHz Sub-frame duration0.5 ms Sub-carrier spacing15 kHz Sampling frequency1.92 MHz (1/ MHz) 3.84 MHz7.68 MHz ( MHz) MHz ( MHz) MHz ( MHz) MHz ( MHz) FFT size Number of occupied sub-carriers, Number of OFDM symbols per sub frame (Short/Long CP) 7/6 CP length (μs/samples) 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)

GSC: Standardization Advancing Global Communications 3GPP LTE and SAE –Uplink Parameters (Variant including TD SCDMA framing also supported) Transmission BW1.25 MHz 2.5 MHz5 MHz10 MHz15 MHz20 MHz Timeslot duration0.675 ms Sub-carrier spacing15 kHz Sampling frequency1.92 MHz (1/ MHz) 3.84 MHz7.68 MHz ( MHz) MHz ( MHz) MHz ( MHz) MHz ( MHz) FFT size Number of occupied sub-carriers, Number of OFDM symbols per Timeslot (Short/Long CP) 9/89/8 CP length (μs/samples) Short7.29/147.29/287.29/567.29/ / /224 Long16.67/ / / / / /51 2 Timeslot Interval (samples)Short Long

GSC: Standardization Advancing Global Communications 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 SAE SAE –Looking at the implications for the overall architecture resulting from: –3GPPs (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 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 SAE SAE architecture From TR MME – Mobility Management Entity UPE – User Plane Entity AS – Access System Red indicates new functional element / interface

GSC: Standardization Advancing Global Communications 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 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