ETSI TS 103 175规定了驻留在网络中的分散拥塞控制（DCC）实体的功能 ITS-G5A、ITS-G5B和ITS-G5D无线电接口的管理平面，统称为5 GHz ITS 频带。DCC操作的目的是评估活动无线信道的负载并优化无线信道 通过管理ITS-S DCC参数来使用。另一个目的是跟踪和帮助DCC的交换 无法通过数据平面在不同层之间传输的参数。 本文件规定:DCC需要在管理层面上的必要支持功能，即跨层DCC 操作。DCC管理实体和设施中DCC实体之间所需的接口参数， 网络和传输以及访问层。测试程序和相应的测试用例。

ETSI TS 103 175 specifies the functionality of the decentralized congestion control (DCC) entity residing in the management plane for the ITS-G5A, ITS-G5B, and ITS-G5D radio interfaces, collectively known as the 5 GHz ITS frequency band.The purpose of the DCC operation is to evaluate the load of the active radio channels and to optimize the radio channel usage by managing the ITS-S DCC parameters. Another purpose is to keep track and help the exchange of DCC parameters which cannot be conveyed via the data plane between the different layers.The present document specifies:The necessary support functions of DCC that needs to be in the management plane, i.e. cross-layer DCC operations.The required interface parameters between the DCC management entity and the DCC entities in the facilities, the networking & transport and the access layers.The testing procedures and corresponding test cases.