IEEE Std 802.11™-2012 1. Overview

1. Overview
1概览
1.1 Scope

1.1范围
The scope of this standard is to define one mediumaccess control (MAC) and several physical layer (PHY)
specifications for wireless connectivity for fixed,portable, and moving stations (STAs) within a local area.
这份标准的范围是定义以下内容的规范：在本地内，固定、可移动和正在移动的STAs，无线连接的MAC和PHY。
1.2 Purpose

1.2目的
The purpose of this standard is to provide wirelessconnectivity for fixed, portable, and moving stations
within a local area. This standard also offersregulatory bodies a means of standardizing access to one or
more frequency bands for the purpose of local areacommunication.
这份标准的目的为本地的固定、可移动或者正在移动的STAs提供无线连接。这个标准也为一个或多个为本地通信的频带体哦提供一种标准接入的管理体制。
1.3 Supplementary information on purpose

1.3
目的的详细补充
Specifically, this standard
这份标准详细的目的描述如下：
— Describes the functions and services required by anIEEE 802.11™-compliant device to operate
within independent and infrastructure networks aswell as the aspects of STA mobility (transition)
within those networks.
—
介绍了IEEE 802.11™所需要的功能和服务-在独立和基础设施网络中兼容设备的运转以及在这些网络中设备的移动性（过渡：不同网络之间的切换）特征。
— Describes the functions and services that allow anIEEE 802.11-compliant device to communicate
directly with another such device outside of anindependent or infrastructure network.
—
介绍了IEEE 802.11™所允许的功能和服务-在独立或竞争式网络之外兼容设备之间的直接通信。
— Defines the MAC procedures to support the MACservice data unit (MSDU) delivery services.
—定义了支持MSDU传输服务的步骤
— Defines several PHY signaling techniques andinterface functions that are controlled by the
IEEE 802.11 MAC.
—定义了受控于IEEE802.11 MAC的一些PHY信号技术和接口功能
— Permits the operation of an IEEE 802.11-conformantdevice within a wireless local area network
(WLAN) that may coexist with multiple overlappingIEEE 802.11 WLANs.
—允许操作的IEEE802.11-符合标准设备在一个无线局域网络(WLAN)，可能与多个重叠的
IEEE 802.11 Wlan 共存
— Describes the requirements and procedures toprovide data confidentiality of user information and
MAC management information being transferred over thewireless medium (WM) and
authentication of IEEE 802.11-conformant devices.
—描述了保证用户信息和MAC管理信息在无线介质（WM)和被IEEE
802.11认证的标准设备中传输的安全性所需要求和程序。
— Defines mechanisms for dynamic frequency selection(DFS) and transmit power control (TPC) that
may be used to satisfy regulatory requirements foroperation in any band.
—定义了可能用于保证任何频带不干扰安全性的动态频率选择（DFS）和发射功率控制（TPC）的机制。
— Defines the MAC procedures to support local areanetwork (LAN) applications with quality-of-
service (QoS) requirements, including the transportof voice, audio, and video.
—定义了MAC程序用于支持局域网（LAN）内质量服务（Qos）需求，包括语音、音频、视频的传输。
— Defines mechanisms and services for wirelessnetwork management of STAs that include BSS
transition management, channel usage and coexistence,collocated interference reporting,
diagnostic, multicast diagnostic and event reporting,flexible multicast, efficient beacon
mechanisms, proxy ARP advertisement, location, timingmeasurement, directed multicast, extended
sleep modes, traffic filtering, and managementnotification.
—定义了以下STAs无线网络管理的机制和服务：BSS过渡管理，信道资源利用和共存，并置的干扰报告、
诊断、 多播诊断和事件报告、 灵活的多播、 高效beacon机制、 代理 ARP
广告、位置、 定时测量、 定向的多播、 扩展的睡眠模式、 流量筛选和管理通知。
— Defines functions and procedures aiding networkdiscovery and selection by STAs, information
transfer from external networks using QoS mapping,and a general mechanism for the provision of
emergency services.
—定义了STAs发现和选择网络的功能和程序，外部网络使用Qos映射的消息传递和提供紧急服务的常用机制。
— Defines the MAC procedures that are necessary forwireless multi-hop communication to support
wireless LAN mesh topologies.
—为了支持无线LAN MESH技术，定义了无线多跃点通信所必需的MAC层程序。
1.4 Word Usage
1.4
词语使用
In this document, the word shall is used to indicatea mandatory requirement. The word should is used to
indicate a recommendation. The word may is used toindicate a permissible action. The word can is used for
statements of possibility and capability.
在本文中，shall意味着强制实现的行为。should意味着推荐的行为。may意味着被允许的行为。can意味着量力而行的行为。