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Research Highlights Power-Saving Issues

Research Highlights Power-Saving Issues. Outline. E. S. Jung and N. Vaidya, “ An Energy Efficient MAC Protocol for Wireless LANs ” , INFOCOM 2002.

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Research Highlights Power-Saving Issues

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  1. Research HighlightsPower-Saving Issues

  2. Outline • E. S. Jung and N. Vaidya, “An Energy Efficient MAC Protocol for Wireless LANs”, INFOCOM 2002. • Eun-Sun Jung and Nitin Vaidya, “A Power Control MAC Protocol for Ad Hoc Networks,” ACM International Conference on Mobile Computing and Networking (MobiCom), September 2002. • Y.-C. Tseng, C.-S. Hsu, and T.-Y. Hsieh, “Power-Saving Protocols for IEEE 802.11-Based Multi-Hop Ad Hoc Networks,” IEEE INFOCOM, 2002.

  3. Research Highlight:ATIM window length adjustment • ATIM window length has performance impact on an ad hoc network. • How to choose a proper size of ATIM window? • Ref: E. S. Jung and N. Vaidya, “An Energy Efficient MAC Protocol for Wireless LANs”, INFOCOM 2002.

  4. Research Highlight:Asynchronous PS for multi-hop MANET • Y.-C. Tseng, C.-S. Hsu, and T.-Y. Hsieh, “Power-Saving Protocols for IEEE 802.11-Based Multi-Hop Ad Hoc Networks,” IEEE INFOCOM, 2002. • Problem statement: • clock drift (asynchronous) • network partitioning • Example: • Proposed solutions: • dominating: over ½ of awake time • periodical: wake up fully from time to time • quorum: from quorum concept in distributed systems

  5. Research Highlight:Soft handover by PS mode • for soft handover: • 802.11 only allows hard handover • searching for new AP only after a STA loses its previous AP • thus, causing long delay (e.g., VoIP services are delay-sensitive) • to support soft handover, a STA must frequently scan new AP’s • approach: • using PS mode as an excuse to search for neighboring APs (through such as an full frame with PS bit = 1) • the old AP will buffer frames during the PS period.

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