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802.11b网络标准

已有 711 次阅读2014-6-6 23:22 |个人分类:Wi-Fi| 关键词: Wi-Fi, 嵌入式系统

价格便宜的便携式计算机、移动电话和手持式嵌入式系统设备的日趋流行,以及Internet应用程序和电子商务的快速发展,使用户需要随时进行网络连接。为满足这些需求,可以使用两种方法将便携式设备连接到网络,而没有电缆所带来的不便。这两种标准就是802.11b和Bluetooth。802.11b是一种11Mb/s 无线标准,可为笔记本电脑或桌面电脑用户提供完全的网络服务。
以往,无线局域网发展缓慢,推广应用困难,主要是由于传输速率低、成本高、产品系列有限,且很多产品不能相互兼容。如以前无线局域网的速率只有1~2Mb/s,而许多应用也是根据10Mb/s以太网速率设计的,限制了无线产品的应用种类。针对目前高速增长的数据业务和多媒体业务,无线局域网取得进展的关键就在于高速新标准的制定,以及基于该标准的10Mb/s甚至更高速率产品的出现。IEEE 802.11b从根本上改变了无线局域网的设计和应用现状,满足了人们在一定区域内实现不间断移动办公的需求,为我们创造了一个自由的空间。

Contents
3.8 Basic service set (BSS) basic rate set..........................................................................................1
4. Abbreviations and acronyms................................................................................................................2
7.2.3.1 Beacon frame format................................................................................................................2
7.2.3.9 Probe Response frame format..................................................................................................3
7.3.1.4 Capability Information field....................................................................................................3
7.3.1.9 Status Code field......................................................................................................................5
7.3.2.2 Supported Rates element..........................................................................................................5
9.2 DCF..............................................................................................................................................5
9.6 Multirate support..........................................................................................................................6
10.3.2.2 MLME_scan.confirm.............................................................................................................6
10.3.2.2.2 Semantics of the service primitive......................................................................................7
10.3.3.1.2 Semantics of the service primitive......................................................................................8
10.3.10 Start.........................................................................................................................................8
10.3.10.1.2 Semantics of the service primitive....................................................................................9
10.4.4 PLME_DSSSTESTMODE.....................................................................................................10
18. High Rate, direct sequence spread spectrum PHY specification.......................................................11
18.1Overview....................................................................................................................................11
18.2High Rate PLCP sublayer..........................................................................................................12
18.3High Rate PLME........................................................................................................................27
18.4High Rate PMD sublayer...........................................................................................................30
Annex A (normative), Protocol implementation conformance statement (PICS) proforma.........................59
Annex C (normative), Formal description of MAC operation......................................................................64
Annex D (normative), ASN.1 encoding of the MAC and PHY MIB............................................................88
Annex F (informative), High Rate PHY/frequency-hopping interoperability...............................................89


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