3GPP2’s Progress for IMT-Advanced

Presenter:

Workshop on IMT-Advanced

October 7, 2008

Seoul, Korea

Oct 2008 2

Contents

• 3rd Generation Partnership Project

• 3GPP2’s Activities for IMT-Advanced

• IMT-Advanced Workshop

• Next Step

Oct 2008 3

3GPP2

The Third Generation Partnership Project 2 (3GPP2) is the

Partnership Project for Global cdma2000® Specifications

including:– cdma2000 air interface specifications

– MAP (Mobile Application Part) core network specifications

– Wireless IP network specifications

– All IP multimedia domain specifications

– RAN specifications

– Other ancillary specifications

cdma2000® is the trademark for the technical nomenclature for certain specifications and standards of the Organizational Partners (OPs) of 3GPP2. Geographically (and as of the date of publication), cdma2000® is a registered trademark of the Telecommunications Industry Association (TIA-USA) in the United States.

Oct 2008 4

3GPP2 Organizational Partners (OPs)

ARIB Association of Radio Industries and Businesses (Japan)CCSA China Communications Standard Association (China)TIA Telecommunications Industry Association (NAFTA countries: USA, Canada, Mexico)TTA Telecommunications Technology Association (Korea)TTC Telecommunication Technology Committee (Japan)

Oct 2008 5

Other 3GPP2 Partners

Market Representation Partners (MRPs)CDMA Development Group

IPv6 Forum

IA450 Association

MobileIGNITE

ObserversETSI

ISACC

ITU

Individual Members: Approximately 80 companies

Oct 2008 6

Main Technical Specification

• cdma2000 Rel.0~Rel.D– Support both circuit voice and packet data service simultaneously– Up to 3Mbps on FL /1.8Mbps on RL

• cdma2000 HRPD Rev.0~Rev.B– Optimize for packet data service and provide BCMCS– Up to 4.9Mbps x N on FL / 1.8Mbps x N on RL (N<16)

• UMB(Ultra Mobile Broadband)– New air interface (OFDM, Advanced Antenna, VoIP etc.)– A scalable IP based network architecture – Up to 288Mbps on FL / 75Mbps on RL

Oct 2008 7

3GPP2’s Activities for IMT-Advanced

Oct 2008 8

Summary of 3GPP2’s Work for IMT-Advanced

• 3GPP2 formulated Next Generation Technology Adhoc (NTAH) to prepare IMT-Advanced and future work in July, 2007

• NTAH Activities– Component technology proposals provided by member companies

for next generation were discussed and evaluated – Also, IMT-Advanced requirement and evaluation methodology input

document has been developed

• Steering Committee initiated workshop for IMT-Advanced and future work in 3GPP2 – To share individual member’s view for

Oct 2008 9

Next Generation Technology Proposals on NTAH

• Advance MIMO techniques– Network MIMO– Collision avoidance beamforming– OSTMA (Opportunistic spatial time multiple access)

• 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

Oct 2008 10

3GPP2 Workshop for IMT-Advanced and future

Oct 2008 11

Workshop General

• Workshop was held in Osaka, May 2008 • Individual companies and TSG/MRP

representatives participated workshop• Workshop was initiated for 3GPP2 future work• Objectives

– Identifying what the future activity of 3GPP2 including enhancing current systems is ?

– How will 3GPP2 address and work on IMT-Advanced ?

Oct 2008 12

Operator’s view for next generation system (1)

• CDMA and OFDM are complementary technologies • OFDM-based solutions will be built-out over time as

demand grows and spectrum becomes available. 3G CDMA WAN networks will coexist with OFDM-based solutions until next generation broadband networks are fully capable of delivering: – Ubiquitous coverage – Carrier-grade VoIP – Low-cost devices – Global roaming

Oct 2008 13

Operator’s view for next generation system (2)

• Graceful evolutionary change is preferred over disruptive revolutionary change.

• Migration to newer technologies takes longer, and is never as simple as it may seem.

• Affordable multi-mode devices are essential to the roll-out of any new technology — to build an early critical mass of profitable subscribers

• Enormous economies of scale are essential for any operator to be competitive

• Critical mass can only be achieved with a common global standard and set of deployment parameters

• Compatibility and interoperability across multiple industries requires efficient standard-setting bodies, network maturity and business predictability.

Oct 2008 14

Areas Mentioned for 3GPP2 future work from Vendors

• Many other areas mention with interest, for example: SON, relays/mesh, common IMS

• A few companies provided some indication of schedule– cdma2000 1x and HRPD enhancements seem to be

high priority• Voice capacity increased for cdma2000 1x• Multi-Antenna, VoIP enhancement, Location based service

added on cdma2000 HRPD

– Interworking and Femto also seem to be high priority

Oct 2008 15

Possible paths for IMT-Advanced

• 3GPP2 is considering a various paths for IMT-Advanced– Migrating of existing technologies

• cdma2000 1x, cdma2000 HRPD or UMB

– Also component technologies can discussed separately and be developed on top of any type of framework

Oct 2008 16

Next Steps for IMT-Advanced

• Further discussion will be needed for – making general consensus on which system based IMT-

Advanced system• cdma2000 1x enhancement• cdma2000 HRPD enhancement• UMB enhancement• Otherwise, new technology framework

• And technology should be developed timely based on ITU schedule

Oct 2008 17

Annex: Proposed next generation technologies

Oct 2008 18

•18

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

Oct 2008 19

•19

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

Oct 2008 20

•20

Opportunistic Spatial Time Multiple Access (OSTMA)

• 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

Oct 2008 21

•21

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

Oct 2008 22

•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

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