Multi-Level Codes Sequence for Simultaneous MCS Feedback IEEE 802.16 Presentation Submission Template (Rev. 9) Document Number: IEEE S80216m-08/1152 Date.

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Multi-Level Codes Sequence for Simultaneous MCS Feedback IEEE Presentation Submission Template (Rev. 9) Document Number: IEEE S80216m-08/1152 Date Submitted: Source: Hung-Yu Wei, Ching-Chun Chou Voice:[Telephone Number (optional)] Department of Electrical Engineering, National Taiwan Venue: MAC aspect of enhanced MBS; in response to the TGm Call for Contributions and Comments m-08/033 for Session 57 Base Contribution: IEEE C80216m-08/1152 Purpose: To be discussed and adopted by TGm for use in the IEEE m 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.

MCS feedback in MBS E-MBS service might use high-rate MCS to achieve higher throughput –MS sends adequate MCS to BS Reporting in MBS –Orthogonal feedback channels Waste radio resource –X orthogonal feedback cost if there are X MSs in a MBS group –Simultaneous feedback –X MSs sends simultaneous feedback message in 1 common channel MBS Group SS1 SS3 SS2

Fundamental Idea Only need to know the most robust MCS scheme –All MS could receive the MBS data block with acceptable error rate Use simultaneous feedback to let BS know the most robust MCS scheme –MSs send feedback with the same time-frequency resource blocks

Multi-level Sequence for Modulation and Coding Scheme Adjustment M level of MCS –Require (M-1) levels of sequence for feedback Example –S1: 0001 MCS feedback of 64-QAM –S2: 0011 MCS feedback of 16-QAM –S3: 0111 MCS feedback of QPSK –S4: 1111 MCS feedback of BPSK

Feedback Estimation with Signal Strength Get more information by signal strength estimation Might be integrated with User Counting

Simultaneous Feedback with CDMA codes M level of MCS –Use M CDMA codes BS find the reported CDMA code that represents the most robust MCS scheme for MBS transmission

Proposed Text E-MBS feedback E-MBS supports adaptive MCS transmission to achieve higher data rate. Simultaneous feedback mechanism is used to collect MCS information from MS in the E-MBS group.