1 Proposal for IEEE 802.16m CQI Feedback Channel Framework Document Number: IEEE C80216m-08/936r1 Date Submitted: 2008-09-05 Source: Rath Vannithamby,

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Presentation transcript:

1 Proposal for IEEE m CQI Feedback Channel Framework Document Number: IEEE C80216m-08/936r1 Date Submitted: Source: Rath Vannithamby, Hongmei Sun, Jong-Kae (JK) Fwu, {rath.vannithamby, hongmei.sun, jong-kae.fwu Changlong Xu, Hujun Yin, Sassan Ahmadi changlong.xu, hujun.yin, Intel Corporation Yan-Xiu Zheng, Frank Ren, Richard Li {zhengyanxiu, frank_ren, ITRI Pei-Kai Liao, Chih-Yuan Lin, Paul Cheng {paul.cheng, chihyuan.lin, mediatek.com MediaTek Inc. Dongjun Lee, Zhengzi Li, Jungnam Yun, Jaehyeong Kim {djthekid, zhengzi, jnyun, POSDATA Co, Ltd. Venue: IEEE Session #57, Kobe, Japan. Re: PHY: SDD text cleanup; in response to the TGm Call for Contributions and Comments m-08/033 for Session #57 Base Contribution: N/A Purpose: For TGm discussion and adoption of m SDD text. Notice: This document does not represent the agreed views of the IEEE Working Group or any of its subgroups. It represents only the views of the participants listed in the “Source(s)” field above. It is offered as a basis for discussion. It is not binding on the contributor(s), who reserve(s) the right to add, amend or withdraw material contained herein. Release: The contributor grants a free, irrevocable license to the IEEE to incorporate material contained in this contribution, and any modifications thereof, in the creation of an IEEE Standards publication; to copyright in the IEEE’s name any IEEE Standards publication even though it may include portions of this contribution; and at the IEEE’s sole discretion to permit others to reproduce in whole or in part the resulting IEEE Standards publication. The contributor also acknowledges and accepts that this contribution may be made public by IEEE Patent Policy: The contributor is familiar with the IEEE-SA Patent Policy and Procedures: and. Further information is located at and.

2 Primary/Secondary Fast Feedback Channel Framework We need to have 2 fast feedback channels with different feedback frequency, robustness and coding to improve efficiency. “primary” feedback channel is used to periodically receive channel and other required information from MS reliably. And “secondary” feedback channel is required to achieve an efficient scheduling gain and support all traffic demands with higher capacity. Primary fast feedback channel (PCQICH) –To facilitate a reliable basic connection –Less frequent, Low rate, periodic Secondary fast feedback channel (SCQICH) –To optimize performance and improve channel efficiency –High frequent, High rate, periodic/event-driven –Traffic demand dependent –Link adaptation is needed to supports advance features efficiently Amount of CQI feedback information can be high based on FSS, FFR and MIMO feedback required LA is coarse: based on users’ long term channel statistics

3 Primary/Secondary Fast Feedback Channel Protocol PCQICH –Designed to provide users with periodic and robust transmission –BS makes decision and regulates UE’s CQI feedback behavior Resource allocation Feedback frequency SCQICH –Allocated/updated adaptively based on channel/traffic variation and required MIMO support –Transmission can be event driven –BS decides and schedule below information to SS whether to allocate, when to allocate, the amount of resource and corresponding index, transmission frequency, rate

4 Multiplexing of Primary/Secondary Fast Feedback Channels PCQICH and SCQICH can have different physical structure –Different pilot patterns can be supported –Physical structure designs are optimized for different application (low rate vs. high rate, robust vs. adaptive, etc). Within PCQICH/SCQICH –Multiple channels/users are FDM/TDM multiplexed within one subframe UL fast feedback channels are FDMed with other UL control and data channels

5 Conclusion 2 different physical fast feedback structures (PCQICH, SCQICH) are designed and optimized for different applications –Different feedback frequency, robustness and coding design –PCQICH covers all users with periodic and robust transmission –SCQICH is optimized for users needing narrowband CQI/MIMO feedback with adaptive rate for higher efficiency on demand Within PCQICH/SCQICH, multiple users are FDM/TDM multiplexed within one subframe

6 Text Proposal #1 to IEEE m SDD Revise the text in red with following modified text in blue (Chapter 11 in [IEEE m- 08/003r4 ]) UL Fast Feedback Channel Replace “The UL fast feedback channel is classified into multiple logical channels per user. The mapping of these logical channels into one or multiple physical channels is FFS” with “The UL fast feedback control channel is classified into two types, primary and secondary fast feedback channels. The UL primary fast feedback channel provides fixed rate robust connection. The UL secondary fast feedback channel provides higher throughput with variable rate to carry channel quality indicators and MIMO related feedback information”