無線局域網(wǎng)技術(shù)走勢(shì)(文件)
【正文】 tery powered ? low power consumptionn Small ? small form factorn Single room range feasible and sufficientn Fixed devices (Set top box, TV, DVD, Media Center)n Line powered ? can have higher power assumptionn Larger ? larger form factorn Whole house range feasible and desiredSatellite, Cable, DSL ConnectionSTB/HomeGatewayTV’sStereo’sPC’sCamcorder 6Wireless LAN Hot SpotsHot Spot growth now driven internationally by tele carriersGreatest growth in Japan with NTT aggressively rolling out and dual mode access points and expanding WLAN to GHzSource: IDC,Corp. Reports 7 Technology Comparison Standard Approved July 1997 Sept 1999 June, 2023 Sept 1999Available Spectrum 125MHzFrequencies of Operation in China NonOverlapping Channels3 3 3 51324 (US)Modulation Technology FHSSDSSSCCK CCK,OFDMOFDMData Rate per Channel 1, 2 1, 2, , 11 1, 2, , 6, 9, 11, 12, 18,24, 36, 48, 546, 9, 12, 18,24, 36, 48, 54Max UDP Throughput(1500 byte) Mbps Mbps Mbps* MbpsMax TCP/IP Throughput (1500 byte) Mbps Mbps Mbps* Mbps* With any station in the work, CTSonly mode. 8Important IEEE Working Groups Quality of Servicen EDCF parameterized QoS and HCF pollingbased QoS Securityn Robust Secure Network: (1) AES Encryption, (2) EAP Authentication DFS/TPCn Radar detection and avoidance for European operation InterAccess Point Protocoln Communication between APs for roaming and handover Radio Resource Managementn Improved physical layer management and reporting High Throughput WLANn Extending WLAN data rates beyond 108 Mbps 9T
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