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Transcript
PANEL DISCUSSION WoWMoM 2002 ARUP ACHARYA IBM T J WATSON RESEARCH CENTER [email protected] Conventional wisdom : Integration of WLAN and WWAN Integrated WLAN and GPRS cards allow High-speed access indoors (802.11a supports 54Mbps) Wide-area connectivity via emerging wide-area data services (GPRS / 3G) Ongoing research on seamless roaming between LAN/WAN In-building WLAN Wireless WAN (3G / GPRS) Multi-hop wireless LANs in metro areas Emergence of high-speed 802.11a WLANs (108Mbps) WLANs can operate a varying rates (1,2,..,11, ..,22, ..,54, 108) Reception range decreases with rate Given the above, we can think of a cellular-like architecture for multi-hop wireless networks Start with a large cell; as nodes increase split into (higher rate) smaller cells Connect to the Internet via multiple wireless LAN hops 54 22 11 Ongoing research on multi-hop WLAN Enhanced medium access control (MAC) protocol for 802.11 that increases system throughput by supporting parallel transmissions (MACA-P) P P Q Q B A New WLAN card architecture to support packet forwarding within the card “wireless” router (see paper in WoWMoM 2002) Joint work with Archan Misra, IBM Research B A MACA-P : basic idea “Master” sender-receiver pair announces “schedule” “Waiting room”, DATA tx period, ACK tx period A neighboring node of master sender can transmit DATA in parallel A neighbouring node of master receiver can receive in parallel P Q control DATA tx ACK gap RTS CTS B A RTS CTS B A Q P Possible deployment scenarios City-wide multi-hop fixed wireless LAN networks could be run by a service operator, civic government Two-tier mesh networks First tier : access point for user Second tier : access points interconnected via a wireless mesh Backhaul to the Internet from a few points in the second tier mesh Eases deployment and cost Application VoIP gaining strength in the Internet Enterprises switching to VoIP for new installations Internet service providers offering VoIP VoIP over DSL and Cable in trials Can VoIP be extended over multi-hop metro wireless networks? Initial source of revenue Start offering media rich services gradually Location based Build a data network to support voice [wlan / IP based approach] Rather than extending a voice network to support data service