1. doc.: IEEE 802.11-04/xxx Submission November 2004 Pen C. Li, et al, Philips Slide 1 Begonya Otal, Job Oostveen, Joerg Habetha, Monisha Ghosh, Pen C. Li, Ronald Rietman, Naveen Kakani, Nico VanWaes, Srinivas Sreemanthula, Yousuf Saifullah, TK Tan, Jon Rosdahl, KyungHun Jang, DJ Lee, Youngsoo Kim November 15 th, 2004 Joerg.Habetha@philips.com Merged Partial Proposal to IEEE 802.11 TGn regarding Multiple Data Rate and Receiver Aggregation Nokia/Philips/Samsung

2. doc.: IEEE 802.11-04/xxx Submission November 2004 Pen C. Li, et al, Philips Slide 2 Content Problem Statement General PPDU Frame Format MMRA: Multiple MCS and Receiver Aggregation MMRA Feasibility with WWiSE Performance evaluation and comparison to Single MCS Multiple Receiver Aggregation (SMRA)

3. doc.: IEEE 802.11-04/xxx Submission November 2004 Pen C. Li, et al, Philips Slide 3 Multiple Receiver Aggregation Increases throughput efficiency significantly Reduces buffering delay because MPDUs of different receivers can be aggregated Receivers will have different link qualities and data rates: 54 Mbps 6 Mbps 108 Mbps Furthest receiver could limit throughput of all other stations  Aggregation of different Modulation and Coding Schemes (MCS)

4. doc.: IEEE 802.11-04/xxx Submission November 2004 Pen C. Li, et al, Philips Slide 4 General PPDU Format HT-SIG contains Multiple MCS and Receiver Aggregation (MMRA) Part HT-SIG1 indicates presence and MCS of the following HT-SIG MMRA Part HT-SIG MMRA Part has variable Length and MCS (Length information on MMRA Part at the beginning of MMRA Part) HT-SIG MMRA Part can be transmitted at the minimum MCS of the sub- aggregates or a more robust MCS.

5. doc.: IEEE 802.11-04/xxx Submission November 2004 Pen C. Li, et al, Philips Slide 5 Different MCS codes included in HT-SIG MMRA Part for each aggregate HT-SIG MMRA Part contains for each MCS: Offset, Nr. Receivers and MAC-addresses of receivers of this MCS Power efficiency in PHY (sleeping with sub-aggregate granularity) MRAD is kept so as to be compliant with existing TGnSync Multi-Receiver aggregation. Thus, making MMRA as an add on feature with existing TGnSync aggregation. MRAD and MPDUs are separated by the MPDU delimiter. Example: 2 Rx with MCS1 / 2 Rx with MCS2 / 1 Rx with MCS3 Format of HT-SIG MMRA part & PSDU DATA HT-SIG MMRA part PSDU DATA

6. doc.: IEEE 802.11-04/xxx Submission November 2004 Pen C. Li, et al, Philips Slide 6 Fields of HT-SIG MMRA Part

7. doc.: IEEE 802.11-04/xxx Submission November 2004 Pen C. Li, et al, Philips Slide 7 Power saving & Throughput efficiency MMRA allows for efficient power saving scheme Midambles inside the aggregate enable channel estimation/re-synchronization after wake-up, if needed Allows increased throughput by having midambles between sub-aggregates of different MCS

8. doc.: IEEE 802.11-04/xxx Submission November 2004 Pen C. Li, et al, Philips Slide 8 Performance evaluation and comparison to Single MCS Multiple Receiver Aggregation (SMRA)

9. doc.: IEEE 802.11-04/xxx Submission November 2004 Pen C. Li, et al, Philips Slide 9 Example: 2 Rx with MCS1 / 2 Rx with MCS2 / 1 Rx with MCS3 3 Complete PPDUs (PHY Header+DATA) must be send: one for each PSDU/MCS 2 SIFS are required to separate PPDUs at different data rates 2 MRADs are required at the beginning of each Aggregate. Note that last MPDU is sent in this case without aggregation because there is just one receiver. HT-SIG has no additional fields for the aggregates. Single MCS Multiple Receiver Aggregation (SMRA)

10. doc.: IEEE 802.11-04/xxx Submission November 2004 Pen C. Li, et al, Philips Slide 10 Explanation of Analytical Computations Curves Blue curves are for HT-SIG MMRA Part received at basic rate (6 Mbps) Purple curves are for HT-SIG MMRA Part received at the minimum rate of all aggregates (MCSmin) Blue and Purple curves are twice performed, once with a long midamble of 8 usec and once with a midamble of 4 usec Red curves is based on TGn Sync MRA, named SMRA MRAD from SMRA is sent at basic rate

11. doc.: IEEE 802.11-04/xxx Submission November 2004 Pen C. Li, et al, Philips Slide 11 Scenario 1: 5 STA at 3 MCS: 24,54,108 Mbps

12. doc.: IEEE 802.11-04/xxx Submission November 2004 Pen C. Li, et al, Philips Slide 12 Scenario 2: 15 STA at 3 MCS: 24,54,108 Mbps

13. doc.: IEEE 802.11-04/xxx Submission November 2004 Pen C. Li, et al, Philips Slide 13 Scenario 3: 10 STA at 5 MCS: 18,24,48,54,108 Mbps

14. doc.: IEEE 802.11-04/xxx Submission November 2004 Pen C. Li, et al, Philips Slide 14 Scenario 4: 30 STA at 5 MCS: 18,24,48,54,108 Mbps

15. doc.: IEEE 802.11-04/xxx Submission November 2004 Pen C. Li, et al, Philips Slide 15 Conclusions Multiple receiver aggregation reduces delay compared to single receiver aggregation Aggregates with different MCS may either be aggregated or sent separately (MMRA versus SMRA) MMRA is much more power efficient than SMRA MMRA can be added on top of TGnSync SMRA For MMRA trade-off between power and throughput efficiency Chosen MMRA is not only more efficient than SMRA in terms of power consumption but also in terms of throughput efficiency in most scenarios MMRA can be merged with WWiSE HTP Burst, and fills the gap in HTP burst by providing power and throughput efficiency  MMRA should be always preferred over SMRA