Both Signalling and user data may be subject to ciphering.
信令和用户数据都应被加密。
The present document specifies the standards for user data transport protocols and related signalling protocols to establish user plane transport bearers over the S1 interface.
文档对数据传输协议和相关的通过S1接口建立用户平面传输承载的信令协议进行了详细的说明。
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