TSG-C Activity Report Presented by TSG-C NTAH Chair Anthony Soong (Huawei) Notice Contributors grant a free, irrevocable license to 3GPP2 and its Organization Partners to incorporate text or other copyrightable material contained in the contribution and any modifications thereof in the creation of 3GPP2 publications; to copyright and sell in Organizational Partner’s name any Organizational Partner’s standards publication even though it may include portions of the contribution; and at the Organization Partner’s sole discretion to permit others to reproduce in whole or in part such contributions or the resulting Organizational Partner’s standards publication. The contributor is also willing to grant licenses under such contributor copyrights to third parties on reasonable, non-discriminatory terms and conditions for purpose of practicing an Organizational Partner’s standard which incorporates this contribution. This document has been prepared by the contributor to assist the development of specifications by 3GPP2. It is proposed to the Committee as a basis for discussion and is not to be construed as a binding proposal on the contributors. The contributor specifically reserves the right to amend or modify the material contained herein and nothing herein shall be construed as conferring or offering licenses or rights with respect to any intellectual property of the contributors other than provided in the copyright statement above.

2 Introduction  This special workshop gives us a unique opportunity to evaluate the activities in 3GPP2  This contribution details the activities in TSG-C Recently completed activities Current activities Plan activities

Recently Completed Activities

4 Working Group Projects  EVRC rev B MPS and software distribution  EVRC rev C MPS and software distribution  Packet Switched Video Telephony  HRPD-Rev B: Published April 2007  UMB: Published Sep. 2007

5 NTAH  3GPP2 has recently updated its scope and charter to include development of beyond 3G system such as that for IMT-Advanced.  Consequently, TSG-C formed the Next Generation Technology Adhoc (NTAH) in July 2007 It is a focus group responsible for the technological development, assessment and evaluation of the next generation wireless air interface (UMB enhancement)  NTAH activity Developed the 3GPP2 comments on the IMT-Advanced requirement (IMT.TECH) document Developing the 3GPP2 comments on the IMT-Advanced Evaluation Methodology (IMT.EVAL) Currently evaluating, assessing and consolidating technology proposals Develop 3GPP2’s RIT submittal for IMT-Advanced

6 Input to IMT.TECH  TSG-C submitted C00-NTAH R4 as a final input to IMT.TECH  Technically reasonable numbers are chosen based on known technologies Key minimum requirements Cell Spectral Efficiency Peak Data Rate Cell Edge User Throughput Not less than ¼ of average MS throughput in worst 5% user VoIP Capacity50 users/MHz LatencyControl plane : 100msTransport plane : 10ms

7 Input to IMT.EVAL  Documents related with input to IMT.EVAL TSG-C submitted C00-NTAH Clarify evaluation for Base coverage urban environment as mandatory and other environment such as Microcellular, Indoor, and High speed as optional Clarify evaluation for primary MIMO channel model as mandatory and the other model as optional C00-NTAH is under discussion Addition of evaluation methodology for advanced MIMO and relay

Current Activities

9 Working Group Projects  Enhanced system selection for Femto Cells  PRL modifications for UMB  Position Determination: Add support for additional satellite navigation systems and HDP  BCMCS Codecs and Transport Protocols  MMD and PoC Codecs and Transport Protocols  EUIMID modifications to OTASP and R-UIM/CSIM  Multi Mode System Selection  On going maintenance of C.R1001, the Parameter Administration document  UMB: TDD harmonized framework: April 2008 UMB performance characterization: FL/RL calibration done May 2008; initial results April 2008; continuing calibration activity  HRPD: Highly Detectable Pilot (HDP)  Band class updates (Rev C) Added support for UMB, 700 MHz, Air-To-Ground Expected extended V&V, May 2008  On-going maintenance activities for existing air interfaces (1x, HRPD, UMB)

10 NTAH  Proposed Next Generation Technology (UMB enhancement) Advance MIMO techniques Network MIMO Collision avoidance beamforming OSTMA (Opportunistic spatial time multiple access) Zero-forcing beamforming with antenna selection/user cooperation Self configurable BTS Dynamic interference management Multi-hop network: Cooperative transmit diversity and spatial multiplexing Self configurable relay removing need for backhaul PAPR Reduction: Subcarrier remapping and group-based cyclic delay Modulation and coding Enhanced layered modulation and precoded OFDM

Future Activities

12 Working Groups  Smartcards (R-UIM/CSIM) Multimode system selection enhancements using R-UIM/CSIM CSIM/CCAT alignments with Rel 7 features from ETSI UICC enhancements to support High Speed Interface Femtocell Security and Selection  UMB Point Release  HDP  Femtocells  Various Inter-working Specifications (LTE, UMB, WiMax)  A Work Item has been submitted to enhance the HRPD Air Interface. The following areas of work were listed: Location Based Services Priority Services Voice over IP Femto-cell deployments Multi-antenna capabilities: SDMA/MIMO support to further increase peak and average data rates etc..  The Work Item proposed a Stage 2 completion date of September 2008

13 NTAH  NTAH discussed targeting meeting #5 for submittal of the RIT  UMB enhanced development  IMT-Advanced RIT

Annex – proposed next generation technologies

15 Network MIMO  Network MIMO concept: Cochannel interference mitigation through coordinated Tx/Rx at several base stations. Beamforming across base stations helps suppress interference (can combine with DPC/SIC).  In theory, 2-4x gain in spectral efficiency appears possible. Depending on SNR, extent of coordination, ratio of users to base station antennas, etc.  Many practical issues to be dealt with before promised gains can be realized. UplinkDownlink

16 Collision Avoidance Beamforming (CA-BF)  Collision Avoidance Beamforming (CA-BF) beams of neighboring cells are carefully scheduled in coordination to minimize beam collision decreasing intercell interference Precoders for beamforming are selected based on the AT’s feedback that counts the links to neighboring cells as well as the link to serving cells  Over 20% forward link system throughput enhancement with the cost of a few more bits of reverse link feedback overheads  CA-BF effectively increases cell edge user throughput without costing system throughput unlike FFR

17 Opportunistic Spatial Time Multiple Access  OSTMA is a flexible and efficient space-time division multiple access scheme Improved user performance by the flexible beam scheduling and power management A self-contained backhaul network is enabled via the additional antenna panel  Comparing to the current beamforming systems Unlike adaptive beamforming, OSTMA requires no mobility tracking Unlike fixed beamforming, OSTMA improves the system performance via the advanced radio resource management

18 Adaptive Antenna Selection (AAS) for ZF-BF MU-MIMO  Under the limited feedback for ZF-BF MU- MIMO system, the user sum-rate performance becomes saturated even as SINR increases. A TX antenna selection scheme was proposed to cure this problem.  The AAS scheme can also be applied for users with multiple receivers. In this case, a receiver combining scheme is required.

19 ZF-BF MU-MIMO with user cooperation  ZF-BF performs optimally with perfect CSI feedback. An user cooperation scheme in conjunction with ZF-BF could provide better performance under the limited feedback situation.  Detail cooperation procedures including user- clustering algorithm were also described in several NTAH contributions. As we see from the figure beside, since the user selection operation is being done under the user cooperation, the size of CQI feedback can be reduced.

20 Cooperative Communications Through Relays  Cooperative diversity transmission can increase the reliability of the reception  Link throughput can be increased through cooperative spatial multiplexing  Cooperative diversity transmission can be combined with cooperative spatial multiplexing in unified manner Trade-off gains: diversity vs. spatial multiplexing E.g. More diversity gain in the morning and more spatial multiplexing in the evening  Cooperative transmission between relay and mobile station can further increase the spectral efficiency

21 Peak to Average Power Ration Reduction  Peak transmit power is limited by Regulations Interference. both in-band and out-of-band interference are concerned. Hardware Limitations, especially when the bill of materials and power consumption are among the major concerns.  PAPR reduction in research and standards. Known techniques: clipping, coding, PTS, SLM, dynamic PA backoff, single-carrier modulation, etc. Relevant standards: GSM, WCDMA, UMB, LTE, etc.  Two PAPR reduction techniques are investigated for regular OFDM. 1)PAPR reduction with group-based cyclic delays 2)PAPR reduction with subcarrier remapping  Three PAPR reduction schemes are investigated for layer-modulated OFDM 1)Rotated Layer Modulation 2)PAPR Reduction with Layer-Based Cyclic Delay 3)PAPR Reduction with Group-Based Cyclic Delay

22 Precoded OFDM for BCMCS  Enhancements on existing BCMCS are proposed: Strictly Backward Compatible (SBC) Mode OFDM overlayed by Precoded OFDM (P-OFDM) Base layer is OFDM-modulated as in existing BCMCS Enhancement layer is P-OFDM-modulated, where the symbols are precoded with a spreading matrix, such as Walsh-Hadamard matrix, before OFDM Loosely Backward Compatible (LBC) Mode Layered modulation + P-OFDM Loosely Backward Compatible (LBC) Mode (Cont’d) Quasi-Orthogonal OFDM