5GHz频段ITS接入层规范：ETSI EN 302 663 V1.2.1
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"ETSI EN 302 663 V1.2.1 (2013-07)" 是一个欧洲标准，详细规定了在5 GHz频段运行的智能交通系统（Intelligent Transport Systems, ITS）的接入层规范。这个标准是ITS-G5和C-ITS（ Cooperative Intelligent Transport Systems）框架下的一个重要组成部分，涉及到V2X（Vehicle-to-Everything）通信技术。V2X在2019年后逐渐受到关注，其下载量的增加反映了这一领域的热度。此文档可能包含关于物理层（layer 1）、数据链路层（layer 2）以及媒体访问控制（MAC）协议和配置文件等相关信息。
ETSI（欧洲电信标准协会）是制定和维护该标准的组织，位于法国索菲亚安提波利斯。文档关键词包括ITS、物理层、数据链路层、MAC、配置文件和无线通信。用户可以从ETSI的官方网站下载该标准的PDF版本，但要注意不同版本间可能存在差异，应以特定网络驱动器上ETSI秘书处打印的PDF版本为准。此外，标准可能会有修订或状态变化，因此使用者需关注最新的更新信息。
ETSI EN 302 663 V1.2.1的详细内容可能涵盖以下知识点：
1. **5 GHz频段的使用**：标准详细规定了5 GHz频段内的频率分配和频谱管理，确保不同ITS设备间的互操作性和避免干扰。
2. **接入层规范**：包括物理层和数据链路层的详细定义，如调制解调技术、信道编码和解码、同步机制以及错误检测与纠正等。
3. **媒体访问控制（MAC）**：定义了如何在多个设备之间共享无线资源，包括竞争访问和预约访问机制，以提高通信效率和可靠性。
4. **V2X通信**：V2X技术允许车辆与其他车辆（V2V）、基础设施（V2I）、行人（V2P）以及互联网（V2N）进行通信，涉及安全驾驶、交通优化和信息服务等多个应用场景。
5. **配置文件**：标准可能包含特定场景下的通信配置文件，比如高速公路上的V2V通信或者城市环境中的V2I交互。
6. **安全与隐私**：规定了数据加密和身份认证机制，以保护通信的安全性和用户的隐私。
7. **兼容性与互操作性**：确保不同厂商的设备能够按照同一套规则进行通信，增强整个ITS生态系统的兼容性。
8. **测试与验证**：提供了测试用例和验证方法，以确保设备符合标准要求。
9. **更新与维护**：标准的修订过程和状态变更通知，确保用户始终使用最新和最准确的技术规范。
通过理解并遵循ETSI EN 302 663 V1.2.1，开发者和制造商可以构建符合欧洲标准的智能交通系统解决方案，推动自动驾驶、车联网和智慧交通的发展。
ETSI
ETSI EN 302 663
V1.2.1 (2013
-
07)
5
1 Scope
The scope of the present document is to define the two lowest layers, physical layer and the data link layer, grouped into
the access layer of the ITS station reference architecture EN 302 665 [i.8]. The access layer technology that is specified
in the present document is collectively called ITS-G5. It is part of the communication stack supporting data exchange
between mobile stations without prior network set-up, i.e. ad hoc mode, for the following frequency bands in Europe:
• ITS-G5A: Operation of ITS-G5 in European ITS frequency bands dedicated to ITS for safety related
applications in the frequency range 5,875 GHz to 5,905 GHz.
• ITS-G5B: Operation in European ITS frequency bands dedicated to ITS non-safety applications in the
frequency range 5,855 GHz to 5,875 GHz.
• ITS-G5D: Operation of ITS applications in the frequency range 5,905 GHz to 5,925 GHz.
The ITS-G5 technology is based on IEEE 802.11-2012 [3] and IEEE/ISO/IEC 8802-2-1998 [5]. By setting the MIB
variable dot11OCBActivated to true in IEEE 802.11-2012 [3] communication outside the context of a BSS is
possible. This type of communication allows for immediate exchange of data frames, avoiding the management
overhead used with the establishment of a network. All requirements in IEEE 802.11-2012 [3] associated with
communication "outside the context of a BSS" are also requirements in the present document. All optional functionality
in IEEE 802.11-2012 [3] associated with communication "outside the context of a BSS" is also optional in the present
document.
2 References
References are either specific (identified by date of publication and/or edition number or version number) or
non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the
reference document (including any amendments) applies.
Referenced documents which are not found to be publicly available in the expected location might be found at
http://docbox.etsi.org/Reference
.
NOTE: While any hyperlinks included in this clause were valid at the time of publication, ETSI cannot guarantee
their long term validity.
2.1 Normative references
The following referenced documents are necessary for the application of the present document.
[1] ETSI EN 302 571 (V1.1.1): "Intelligent Transport Systems (ITS); Radiocommunications
equipment operating in the 5 855 MHz to 5 925 MHz frequency band; Harmonized EN covering
the essential requirements of article 3.2 of the R&TTE Directive".
[2] ETSI TS 102 792 (V1.1.1): "Intelligent Transport Systems (ITS); Mitigation techniques to avoid
interference between European CEN Dedicated Short Range Communication (CEN DSRC)
equipment and Intelligent Transport Systems (ITS) operating in the 5 GHz frequency range".
[3] IEEE 802.11-2012: "IEEE Standard for Information technology - Telecommunications and
information exchange between systems - Local and metropolitan area networks-Specific
requirements - Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY)
Specifications".
[4] IEEE 802-2001: "IEEE Standard for Local and Metropolitan Area Networks: Overview and
Architecture".
[5] IEEE/ISO/IEC 8802-2-1998: "Information technology -- Telecommunications and information
exchange between systems -- Local and metropolitan area networks -- Specific requirements --
Part 2: Logical Link Control".
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