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MAC Modification Possible Technical Targets for 11s Mesh Network

This paper discusses possible MAC modifications for the 11s mesh network, including default parameter reconsideration, building on existing 11e techniques, and introducing new technologies.

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MAC Modification Possible Technical Targets for 11s Mesh Network

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  1. MAC ModificationPossible Technical Targetsfor 11s Mesh Network Akira Yamada (NTT DoCoMo) Yoichi Matsumoto (NTT DoCoMo) Hidenori Aoki (NTT DoCoMo) yamadaakir@nttdocomo.co.jp (yamadaakira@nifty.com) matsumotoyou@nttdocomo.co.jp aokihid@nttdocomo.co.jp Akira Yamada, Yoichi Matsumoto, Hidenori Aoki

  2. Background • Issues for mesh media access coordination components in 11s are raised[1] • Necessary to clarify prioritization for 11s MAC modifications • Dependent on performance vs. timeline • Describe our idea of possible next step [1] 11-04-0968-01-000s-issues-for-mesh-media-access-coordination-component-in-11s.doc Akira Yamada, Yoichi Matsumoto, Hidenori Aoki

  3. Three levels of MAC modifications for 11s • Two items for impact level considerations • Performance vs. timeline • Implementation difficulty • Default parameter reconsideration • Parameters (e.g. CW/IFS) • Building on top of current 11e techniques or mandatory use of currently optional 11 standard technology • Header format modifications (e.g. hop-count?) • Optional functions to mandatory (e.g. Block Ack) • Introducing new technologies for 11s • New sequences ? (e.g. RTS/CTS modification) • 11n technologies ? (e.g. Frame aggregation) Akira Yamada, Yoichi Matsumoto, Hidenori Aoki

  4. (1) Default parameter reconsideration Simulation Results • Parameter tuning • e.g. • CWmin • CWmax • AIFSN • TXOPLimit • Parameter granularity tuning • e.g. • CW Default TXOPlimit for VI w/o TXOP 5hop mesh with bidirectional traffic Akira Yamada, Yoichi Matsumoto, Hidenori Aoki

  5. Architecture Example (1) Point Coordination Function (PCF: optional) HCF Controlled Access (HCCA) Mesh Coordination Function 11n MAC MAC EDCA Parameter change Parameter change Distributed Coordination Function (DCF) 11a/11b/11g/11j PHY 11n PHY Akira Yamada, Yoichi Matsumoto, Hidenori Aoki

  6. (2) Build on Current 11e techniques or mandatory use of optional technology • Header format modifications • e.g. Mesh control field for Hop-Count, etc… Mesh Control • Optional functions to mandatory • e.g. Block Acknowledgement Akira Yamada, Yoichi Matsumoto, Hidenori Aoki

  7. Architecture Example (2) Point Coordination Function (PCF: optional) HCF Controlled Access (HCCA) Mesh Coordination Function 11n MAC Block Ack Support MAC EDCA New header support Distributed Coordination Function (DCF) 11a/11b/11g/11j PHY 11n PHY Akira Yamada, Yoichi Matsumoto, Hidenori Aoki

  8. (3) Introducing new technologies for 11s • New sequences • e.g. RTS/CTS modifications for hidden/exposed terminal problems ? • 11n technologies ? • e.g. Aggregation Framing [2] [2] 11-04-0888-00-000n-tgnsync-proposal-presentation.ppt Akira Yamada, Yoichi Matsumoto, Hidenori Aoki

  9. Architecture Example (3) ? New Technologies Point Coordination Function (PCF: optional) HCF Controlled Access (HCCA) Mesh Coordination Function 11n MAC Frame Aggregation MAC EDCA Distributed Coordination Function(DCF) New Sequences 11a/11b/11g/11j PHY 11n PHY Akira Yamada, Yoichi Matsumoto, Hidenori Aoki

  10. Suggested Next Step • Our view : • (1), (2) : Necessary to introduce • (3) : Performance vs. timeline • Discussions for MAC • Prioritize and discussions (1), (2) related techniques Akira Yamada, Yoichi Matsumoto, Hidenori Aoki

  11. BackUp Akira Yamada, Yoichi Matsumoto, Hidenori Aoki

  12. Effect of Block Acknowledgement • BSS : AP - STA • Frame aggregation for a single user • Effective only when a STA with heavy load • ESS-Mesh : MP - MP • Frame aggregation for multiple users Akira Yamada, Yoichi Matsumoto, Hidenori Aoki

  13. Effect of Block Acknowledgement (Cont.) Theoretical Throughput [1] 35% [1] Shu Lin, et al, “Automatic-Repeat-Request Error Control Schemes,” IEEE Trans. Commun., pp.5-17, Dec, 1984. Akira Yamada, Yoichi Matsumoto, Hidenori Aoki

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