1. Comment on Relay Frame Structure
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[IEEE S802.16m-08/1308]
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Masato Okuda, Yanling Lu and Kevin Power Voice:
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IEEE m-08/040“Call for Contributions on Project m 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]
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2. 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

3. 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

4. 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

5. 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

6. 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.

7. 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.

8. Text Proposal (1/3)
[Change the following text at the line page 47 in the subclause (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]

9. Text Proposal (2/3)

10. 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 m zone of the DL of the BS frame, where a IEEE m BS can transmit to the IEEE m RSs and the IEEE m MSs.
• UL Relay Zone: An integer multiple of subframes located in the IEEE m zone of the UL of the IEEE m BS frame, where a IEEE m BS can receive from the IEEE m RSs and the IEEE m MSs.
• DL Transmit Zone: An integer multiple of subframes located in the IEEE m zone of the DL of the IEEE m RS frame, where a IEEE m RS can transmit to subordinate and superordinate IEEE m RSs and the IEEE m MSs.
• DL Receive Zone: An integer multiple of subframes located in the IEEE m zone of the DL of the IEEE m RS frame, where a IEEE m RS can receive from its superordinate and subordinate station.
• UL Transmit Zone: An integer multiple of subframes located in the IEEE m zone of the UL of the IEEE m RS frame, where a IEEE m RS can transmit to its superordinate station.
• UL Receive Zone: An integer multiple of subframes located in the IEEE m zone of the UL of the IEEE m RS frame, , where a IEEE m RS can receive from its subordinate IEEE m RSs and the IEEE m MSs.