MBS Frame Structure Considerations IEEE 802.16 Presentation Submission Template (Rev. 9) Document Number: IEEE S802.16m-08/089 Date Submitted: 2008-01-16.

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MBS Frame Structure Considerations IEEE Presentation Submission Template (Rev. 9) Document Number: IEEE S802.16m-08/089 Date Submitted: Source: Wookbong Lee, Dongcheol Kim, Jaho KooVoice: LG Electronic LG R&D Complex, 533 Dongan-gu, Anyang, , Korea * Venue: Levi, Finland Base Contribution: IEEE C802.16m-08/089 Purpose: For discussion and approval by TGM 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.

Basic numerology Parameter Value : e Reference System Additional simulation assumptions CP length CP ratio1/81/161/4 CP duration11.43 μs5.71 μs22.86 μs OFDM symbol duration μs97.14 μs μs # of samples per symbol # of OFDM symbols per frame # of data OFDM symbols per frame # of data slots Effective frame duration (for fair comparison) ms ms ms

Effective sample number in MBS environment Threshold of [-30dB]

MBS performance: effect of CP length us CP ratio is enough even for large ISD

Proposed MBS frame structure Unicast’s CP ratio MBS CP size option / CP ratio (G) Number of unicast OFDM symbols per MBS subframes Number of MBS OFDM symbols per MBS subframes Number of borrowed OFDM symbols Idle time G uni =1/ μs (G MBS =1/8) NN-KK = 0K*N FFT* (1+G MBS )/F s -N FFT* (G MBS -G uni )/F s *N [s] G uni =1/ μs (G MBS =1/8) NN-KK = ceil(N/18)K*N FFT* (1+G MBS )/F s -N FFT* (G MBS -G uni )/F s *N [s] Since uplink start time for TDD system or preamble start time is well known by MS and BS, so if we put MBS frame at the end of DL frame, MS or BS do not need to do anything with MBS idle time.

MBS feedback (1) AMC type of operation – slow adaptation What will be MBS feedback, ex) ACK/NACK or NACK only or else, and How to feedback it is for further study Number of MBS user in a sector Throughput gain47%11.40%14.26%11.60%8.30%

MBS feedback (2) With MBS feedback, BS decides to turn on/off hierarchical modulation (HM) HM turn off BS’s MSs will experience same quality of service as ‘always HM turn off case’, while HM turn on BS’s MSs can get better services

Conclusion MBS CP duration: 11.43μs for all cases MBS subframes shall be located at the end of DL frame MBS feedback channel shall be considered to improve performance