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MAC Modification Targets for 11s Mesh Network

Explore prioritization of MAC modifications for 11s mesh networks based on performance, timeline, and implementation aspects, including parameter reconsideration and technology enhancements.

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MAC Modification 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 v.s. 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 v.s. 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 • 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 flow control, scheduling, channelization, 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 v.s. 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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