無線網路技術的應用(已修改)
2025-02-21 19:53 本頁面
【正文】 校園無線網路技術與應用發(fā)展ShengTzong Cheng 鄭憲宗062757575 ext. 625292/2/2023 1Outlinen 無線區(qū)域網路 ─ IEEE n 無線應用通訊協(xié)定 ─ WAP2/2/2023 2成大資訊 鄭憲宗無線區(qū)域網路通訊協(xié)定Wireless Local Area Network(IEEE )2/2/2023 3成大資訊 鄭憲宗無線區(qū)域網路標準 IEEE n Specifies a single Medium Access Control (MAC) sublayer and 3 Physical Layer Specifications.n Stations can operate in two configurations :n Adhoc moden Infrastructure moden Three PHY specificationsn Frequency Hopping Spread Spectrum (FHSS).n Direct Sequence Spread Spectrum (DSSS).n Infrared PHY. 2/2/2023 4成大資訊 鄭憲宗IEEE n IEEE Project 802 Charter:n Local Metropolitan Area Networkn 1Mbps to 100Mbps and highern 2 lower layers of 7 Layer OSI Reference Modeln IEEE Working Group scope:n Wireless connectivity for fixed, portable and moving stations within a limited arean Appear to higher layer (LLC) the same as existing 802 standardsApplication LayerNetwork LayerMACPhysical Layer...LLCIEEE DataLinkLayer2/2/2023 5成大資訊 鄭憲宗n 1997/6/26通過成為 IEEE 802系列標準IEEE Media Access ControlLogical Link Control InfraredPhysical Layer FHSSPhysical Layer DSSSPhysical Layer2/2/2023 6成大資訊 鄭憲宗Ad Hoc網路?One Basic Service Set?Directed Connection?Limited Coverage Area2/2/2023 7成大資訊 鄭憲宗APBSSInfrastructure網路AP BasicServiceSetExistingWired LANDistribution SystemOtherLANsExtend Service Set2/2/2023 8成大資訊 鄭憲宗Infrastructure網路 (cont.)n Access Point and Mobile Stationn Distributed System Interconnect Multiple Cells via Access Points to form a single workn Extends Wireless Coverage Arean Multiple Basic Service Sets connected together form an Extended Service Setn Allow Mobile Station to access fixed resourcen Support Roaming for Mobile Stations via Access Pointn Point Coordination Function, Power Management, Time Synchronization support through Access Point2/2/2023 9成大資訊 鄭憲宗IEEE Servicesn Provides services with the following functionality: roaming within a ESS, multiple data rates in BSSs and Power Management.n The MAC protocol is Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA)n MAC servicesn Association servicen Authentication servicen Distribution servicen Integration servicen Deauthentication/Deassociation service2/2/2023 10成大資訊 鄭憲宗Spread Spectrum Technologyn DSSS（ Direct Sequence Spread Spectrum）n 11channelsn PNcode長度為 11bitn 展頻寬度為 11MHzn FHSS（ Frequency Hopping Spread Spectrum）n 78 hop sequencesn 頻帶範圍為 1MHz，n 跳頻的頻率為每秒 n Infrared Rayn 發(fā)展趨勢： DHSS往高速無線區(qū)域網路系統(tǒng)發(fā)展，適合辦公室環(huán)境使用； FHSS會往低價網路應用發(fā)展，提供 SOHO及家庭應用、或周邊設備之無線網路連結。2/2/2023 11成大資訊 鄭憲宗直接序列展頻（ DSSS）2/2/2023 12成大資訊 鄭憲宗跳頻展頻（ FHSS）2/2/2023 13成大資訊 鄭憲宗IEEE TGan The TGa is working on the high datarate extension in the 5 GHz band, project , was able to produce a new draft standard that has the support of at least 80 % of the members.n TGa is looking at
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