tsg-c activity report presented by tsg-c ntah chair anthony soong (huawei) [email protected] notice...
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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.
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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
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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
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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
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Input to IMT.TECH
TSG-C submitted C00-NTAH-20071203-009R4 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 ThroughputNot less than ¼ of average MS throughput in worst 5% user
VoIP Capacity 50 users/MHz
Latency Control plane : 100ms Transport plane : 10ms
Test environment* Downlink Uplink
Stationary 3 b/s/Hz/cell 3 b/s/Hz/cell
Pedestrian 2 b/s/Hz/cell 2 b/s/Hz/cell
Vehicular 1 b/s/Hz/cell 1 b/s/Hz/cell
High Speed 0.8 b/s/Hz/cell 0.8 b/s/Hz/cell
. Mobility classes
Stationary Pedestrian Vehicular High speed
vehicular
Downlink 14 b/s/Hz 14 b/s/Hz 7 b/s/Hz 7 b/s/Hz
Uplink 7 b/s/Hz 7 b/s/Hz 3.5 b/s/Hz 3.5 b/s/Hz
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Input to IMT.EVAL
Documents related with input to IMT.EVAL
• TSG-C submitted C00-NTAH-20071203-010• 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-20080331-011 is under discussion• Addition of evaluation methodology for advanced MIMO and relay
Current Activities
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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)
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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
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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
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NTAH
NTAH discussed targeting meeting #5 for submittal of the RIT
UMB enhanced development
IMT-Advanced RIT
Annex – proposed next generation technologies
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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
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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
Master Scheduler
Wireline connection
Feedback information from AT Scheduled information
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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
Outer Cell
Low power beam
High Power beam
Inner Cell
Cell radius Cell radius
lower panel beam
upper panel beam
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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.
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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.
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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
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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 delays2)PAPR reduction with subcarrier remapping
Three PAPR reduction schemes are investigated for layer-modulated OFDM1)Rotated Layer Modulation2)PAPR Reduction with Layer-Based Cyclic Delay3)PAPR Reduction with Group-Based Cyclic Delay
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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