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标题: [求助]Channel Mode Modify信道模式修改是干什么的？  [查看完整版帖子] [打印本页]

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时间:  2010-8-31 22:32

作者: liuk_cn     标题: [求助]Channel Mode Modify信道模式修改是干什么的？

Abis接口中有一个Channel Mode Modify信令
资料上面说信道模式修改,包括信道描述、信道所采用的新模式3G，
哪位大侠能上来解释一下啊？

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时间:  2010-9-2 19:57

作者: Legendo

Channel Mode Modify——信道模式改变，是协议中定义的一个流程。就是在网络SD信道拥塞的情况，而网络又允许起呼走FACCH的时候，网络就会把一条TCH激活用来传输本来应该在SD上传输的信令，在原本要在SD传输的信令流程完成之后，利用“Channel Mode Modify”将信道的传输模式由信令模式更改为语音模式，用于传输语音。这个过程就是Channel Mode Modify。详细可以查一下协议3GPP TS 48.058


协议中的原文如下：
4.2
Channel MODE MODIFY
This procedure is used by BSC to request a change of the channel mode and/or a change between uni‑directional and bi-directional channel types of an active channel. In addition, for secondary channels in a multislot configuration, the procedure can be used by BSC to request a change in the encryption information of an active channel.
BSC initiates the procedure by sending a MODE MODIFY message to BTS. The message contains the new mode to be used. After having changed to the new mode, BTS responds with a MODE MODIFY ACKnowledge message to BSC.

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