2011 ETSI TS 102 687 V1.1.1: 5GHz V2X Congestion Control for ITS

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ETSI TS 102 687 V1.1.1 (2011-07) 是一份由欧洲电信标准化协会(ETSI)发布的关于智能交通系统(ITS)的技术规范。这份标准主要关注的是在5 GHz频段运行的C-ITS（Connected and Cooperative Intelligent Transportation Systems）中的分散式拥塞控制机制，专注于接入层部分。它为车联网(V2X)通信提供了关键指导，特别是在车辆到一切(V2X)通信的兴起时期，如2019年以后，该标准的下载量的增长显示了其在行业中的重要地位。该标准旨在促进智能交通系统的高效运作，通过定义无线电传输和通信协议，确保道路安全、交通效率和信息共享。关键词包括ITS（Intelligent Transport Systems）、无线通信以及传输技术。文档引用了DTS/ITS-0040014作为参考，并强调了对于用户而言， Portable Document Format (PDF) 版本是权威的，所有版本间的差异应以该格式为准。 ETSI TS 102 687 V1.1.1不仅适用于欧洲，而且其下载服务可供个人用户从ETSI官方网站获取，地址为 <http://www.etsi.org>。任何可能存在的电子版与印刷版之间的差异，均以保存在特定网络驱动器上的PDF版本为准，以解决可能的争议。此标准对那些参与或计划在ITS领域工作，尤其是涉及到5 GHz频段无线通信的开发者、制造商和运营商来说，具有重要的参考价值。它的实施有助于推动全球范围内的C-ITS技术发展，为实现智能交通系统的无缝连接和协同优化提供标准化框架。

ETSI

ETSI TS 102 687 V1.1.1 (2011

07)

number of OFDM symbols in the preamble

DPMS

data bits per OFDM

symbol

pow(p, x) exponentiation: x

S signal power level

signal level threshold

AIR

packet air time

average time for channel access

measuring interval

probing interval

txQ number of DCC_access transmit queues

3.3 Abbreviations

For the purposes of the present document, the abbreviations given in [1], [2], [3], [5] and the following apply:

DCC Decentralized Congestion Control

DCC_access DCC component of the access layer

DCC_app DCC component of the facility layer

DCC_mgmt DCC component of the management layer

DCC_net DCC component of the network layer

D-CCA CCA sensitivity for DCC

DPSK Digital Phase Shift Keying

DSC DCC sensitivity control

NDL Network Design Limits

SM State Machine

SNR Signal to Noise Ratio

TAC Transmit Access Control

TDC Transmit Datarate Control

TPC Transmit Power Control

TRC Transmit Rate Control

VANET Vehicular Ad-hoc NETwork

4 Decentralized congestion control overview

4.1 DCC operational requirements

"Decentralized congestion control" (DCC) is a mandatory component of ITS-G5 stations operating in ITS-G5A and

ITS-G5B frequency bands to maintain network stability, throughput efficiency and fair resource allocation to ITS-G5

stations. DCC requires components on several layers of the protocol stack and these components jointly work together

to fulfil the following operational requirements:

• Provide fair allocation of resources and fair channel access among all ITS stations in the same communication

zone.

• Keep channel load caused by periodic messages below pre-defined thresholds.

• Reserve communication resources for the dissemination of event driven high priority messages.

• Provide fast adoption to a changing environment (busy / free radio channel).

• Keep oscillations in the control loops within well-defined limits.

• Comply to specific system requirements, e.g. reliability.

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