The protocol stack for S1 signalling bearer is shown in figure 4.1 and details on each protocol are described in the following clauses.
图4.1给出了S1信令承载的协议栈，并在下面的章节中详细描述了每个协议。
The protocol stack for S1 signalling bearer is shown in figure 4.1 and details on each protocol are described in the following clauses.
图4.1给出了S1信令承载的协议栈，并在下面的章节中详细描述了每个协议。
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