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This specification describes a medium access control (MAC) and physical layer (PHY) specification for wireless connectivity using dedicated short-range communications (DSRC) services. This standard is based on and refers to IEEE Standards 802.11, Wireless LAN Medium Access Control and Physical Layer Specifications, and 802.11a, Wireless LAN Medium Access Control and Physical Layer Specifications High-Speed Physical Layer in the 5 GHz Band, with permission from the IEEE society. This specification is meant to be an extension of IEEE 802.11 technology into the high-speed vehicle environment. The difference between IEEE 802.11 and IEEE 802.11a operating parameters required to implement a mostly high-speed data transfer service in the 5.9-GHz Intelligent Transportation Systems Radio Service (ITS-RS) Band is explained. Potential operations within the Unlicensed National Information Infrastructure (UNII) Band are also addressed, as appropriate.1.1 This specification2 describes a medium access control (MAC) and physical layer (PHY) specification for wireless connectivity using dedicated short-range communications (DSRC) services. This standard is based on and refers to IEEE Standards 802.11, “Wireless LAN Medium Access Control and Physical Layer Specifications,” and 802.11a, “Wireless LAN Medium Access Control and Physical Layer Specifications High-Speed Physical Layer in the 5 GHz Band,” with permission from the IEEE Society. This specification is meant to be an extension of IEEE 802.11 technology into the high-speed vehicle environment. As presented here, this specification contains just enough information to explain the difference between IEEE 802.11 and IEEE 802.11a operating parameters required to implement a mostly high-speed data transfer service in the 5.9-GHz Intelligent Transportation Systems Radio Service (ITS-RS) band. Potential operations within the Unlicensed National Information Infrastructure (UNII) band are also addressed, as appropriate.1.2 Purpose—The purpose of this specification is to provide wireless communications over short distances between information sources and transactions stations on the roadside and mobile radio units, between mobile units, and between portable units and mobile units. The communications generally occur over line-of-sight distances of less than 1000 m between roadside units and mostly high-speed, but occasionally stopped and slow-moving, vehicles or between high-speed vehicles. This specification also offers regulatory bodies a means of standardizing access to the 5.9-GHz frequency band for the purpose of interoperable communications to and between vehicles at line-of-sight distances on the roadway.1.3 Specifically, this specification accomplishes the following:1.3.1 Describes the functions and services required by a DSRC and IEEE 802.11-compliant device to operate in a high-speed mobile environment.1.3.2 Refers to IEEE 802.11 MAC procedures.1.3.3 Defines the 5.9-GHz DSRC signaling technique and interface functions that are controlled by the IEEE 802.11 MAC.1.3.4 Permits the operation of a DSRC-conformant device within a DSRC communications zone that may coexist with multiple overlapping DSRC communication zones.1.3.5 Describes the requirements and procedures to provide privacy of user information being transferred over the wireless medium and authentication of the DSRC or IEEE 802.11-conformant devices.1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

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本规范适用于符合CISPR16-1-6:2014、ANSI C63.5—2006和SAE ARP958D-2003要求的电磁兼容测试用喇叭天线的校准，频率范围为0.2 GHz～40 GHz，其他喇叭天线可参照本规范执行。

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本规范适用于30 MHz～1 GHz频段的偶极子天线、双锥天线、对数周期天线、复合天线、套筒天线以及其他应用于此频段的测量天线（以下简称天线）的校准。

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本规范适用于频率范围250 MHz～110 GHz的标准增益喇叭天线、波纹喇叭天线、双脊喇叭天线等口面天线以及开口波导探头的增益校准，其他频段口面天线增益校准也可参照本规范。

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