Comment on Relay Frame Structure IEEE 802.16 Presentation Submission Template (Rev. 9) Document Number: [IEEE S802.16m-08/1308] Date Submitted: [2008-10-31] Source: Masato Okuda, Yanling Lu and Kevin Power Voice: +81-44-754-2811 Fujitsu E-mail: okuda@jp.fujitsu.com *<http://standards.ieee.org/faqs/affiliationFAQ.html> Venue: IEEE 802.16m-08/040“Call for Contributions on Project 802.16m System Description Document (SDD)”, in response to the following topics: “TGm SDD: Other (for contributions in support of a comment)”, PHY related Relay Frame structure] Base Contribution: N/A Purpose: to be discussed and adopted by TGm for the 802.16m SDD Notice: This document does not represent the agreed views of the IEEE 802.16 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 802.16. Patent Policy: The contributor is familiar with the IEEE-SA Patent Policy and Procedures: <http://standards.ieee.org/guides/bylaws/sect6-7.html#6> and <http://standards.ieee.org/guides/opman/sect6.html#6.3>. Further information is located at <http://standards.ieee.org/board/pat/pat-material.html> and <http://standards.ieee.org/board/pat >.

Increase of Usable Resource by Option 2 Considering typical cell deployment scenario of reuse 3, Option 2 can increase usable radio resource on relay link between RSs and access link between RS and MS. Example of Relay System is shown below. The different colors represent different segments (or frequency partitions). BS RS1 RS2 RS3 RS4 RS5

Radio Resource Usage in Option-1 Tx: BSMS Tx: BSRS1/2 Rx: MSBS Rx: RS1/2BS BS Rx: BSRS1 Tx: RS1BS Tx: RS1MS Tx: RS1RS3/4 Rx: MS/RS3/4RS1 RS1 Rx: BSRS2 Tx: RS2BS Tx: RS2MS Tx: RS2RS5/6 Rx: MS/RS5/6RS2 RS2 Rx: RS1RS3 Tx: RS3RS1 Tx: RS3MS Tx: RS3MS/RS Rx: MS/RSRS3 RS3 Tx: RS4MS Tx: RS4MS/RS Rx: MS/RSRS4 Rx: RS1RS4 Tx: RS4RS1 RS4 Tx: RS5MS Tx: RS5MS/RS Rx: MS/RSRS5 Rx: RS2RS5 Tx: RS5RS2 RS5 Tx: RS6MS Tx: RS6MS/RS Rx: MS/RSRS6 Rx: RS2RS6 Tx: RS6RS2 RS6

Radio Resource Usage in Option-2 Tx: BSMS Tx: BSRS1/2 Rx: MSBS Rx: RS1/2BS BS Rx: BSRS1 Tx: RS1BS Tx: RS1MS Tx: RS1RS3/4 Rx: MS/RS3/4RS1 Tx: RS1MS/RS3/4 RS1 Rx: BSRS2 Tx: RS2BS Tx: RS2MS Tx: RS2RS5/6 Rx: MS/RS5/6RS2 Tx: RS2MS/RS5/6 RS2 Rx: RS1RS3 Tx: RS3RS1 Tx: RS3MS Rx: MS/RSRS3 Tx: RS3MS/RS RS3 Tx: RS4MS Rx: MS/RSRS4 Tx: RS4MS/RS Rx: RS1RS4 Tx: RS4RS1 RS4 Tx: RS5MS Rx: MS/RSRS5 Tx: RS5MS/RS Rx: RS2RS5 Tx: RS5RS2 RS5 Tx: RS6MS Rx: MS/RSRS6 Tx: RS6MS/RS Tx: RS5MS/RS Rx: RS2RS6 Tx: RS6RS2 RS6

Throughput improvement by Option-2 (1/3) Topology: 3-hop Relay See the right figure DL:UL ratio = 5:3 DL includes an MBS zone MCS: Relay Link: 64QAM1/2 BS/RS  MS; Unicast: 16QAM1/2 MBS: QPSK1/2 Data amount sent on a subframe QPSK1/2: 1 unit 16QAM1/2: 2 units 64QAM1/2: 3 units BS RS1 RS2 MS 64QAM1/2 16QAM1/2

Throughput improvement by Option-2 (2/3) Example of Option 1 Relay Frame Structure BS can send 6 units of data to RS1. However, RS1 cannot send all of data to its subordinate RS/MS because of lack of radio resource. RS2 cannot utilize its available radio resource because of lack of received data. Especially, in case of no traffic to MS under RS1, RS1RS2 link becomes bottleneck.

Throughput improvement by Option-2 (3/3) Example of Option 2 Relay Frame Structure RS1 can use extra radio resource of option 2 to send the rest of data to its subordinate MS/RS. RS2 can utilize the unused radio resource to send data received on the extra radio resource of option 2. => Therefore, Option 2 can improve overall throughput.

Text Proposal (1/3) [Change the following text at the line 26-27 page 47 in the subclause 11.4.4 (Relay Support in Frame Structure) as indicated] There are two options for the Relay frame structure. These are captured in Figure 25 and Figure 26. Further study is required to distill a single frame structure from among these two options. Figure 25 shows the Relay frame structure. [Replace the figure 25 with the figure in the next slide] [Remove Figure 26 in page 50 and text from the line 3 page 50 to the line 2 page 51]

Text Proposal (2/3)

Text Proposal (3/3) [Change the following text at the line 5 page 48 as indicated] Definitions corresponding to relay frame structureOption 1 shown in Figure 25 • 16m DL Access Zone: An integer multiple of subframes located in the 16m zone of the BS frame and 16m RS frame, where a 16m BS and 16m RS can transmit to the 16m MSs. • 16m UL Access Zone: An integer multiple of subframes located in the 16m zone of the BS frame, where a 16m BS can receive from the 16m MSs. • DL Relay Zone: An integer multiple of subframes located in the IEEE 802.16m zone of the DL of the BS frame, where a IEEE 802.16m BS can transmit to the IEEE 802.16m RSs and the IEEE 802.16m MSs. • UL Relay Zone: An integer multiple of subframes located in the IEEE 802.16m zone of the UL of the IEEE 802.16m BS frame, where a IEEE 802.16m BS can receive from the IEEE 802.16m RSs and the IEEE 802.16m MSs. • DL Transmit Zone: An integer multiple of subframes located in the IEEE 802.16m zone of the DL of the IEEE 802.16m RS frame, where a IEEE 802.16m RS can transmit to subordinate and superordinate IEEE 802.16m RSs and the IEEE 802.16m MSs. • DL Receive Zone: An integer multiple of subframes located in the IEEE 802.16m zone of the DL of the IEEE 802.16m RS frame, where a IEEE 802.16m RS can receive from its superordinate and subordinate station. • UL Transmit Zone: An integer multiple of subframes located in the IEEE 802.16m zone of the UL of the IEEE 802.16m RS frame, where a IEEE 802.16m RS can transmit to its superordinate station. • UL Receive Zone: An integer multiple of subframes located in the IEEE 802.16m zone of the UL of the IEEE 802.16m RS frame, , where a IEEE 802.16m RS can receive from its subordinate IEEE 802.16m RSs and the IEEE 802.16m MSs.