GSM Channel Mode Modify和Channel Mode Modify Acknowledge信令
最近研究了下如何通过GSM Channel Mode Modify和Channel Mode Modify Acknowledge信令，获知GSM终端支持的data Rate 思路与原理：
?In an RR connected state, acknowledges a CHANNEL MODE MODIFY message by sending a CHANNEL MODE MODIFY ACKNOWLEDGEMENT message specifying and switching to the correct mode.?- the new mode if that mode is supported.?- the old mode if the new mode is not supported.
相关信令：StepDirectionMessage1SS->MSPAGING REQUEST TYPE 12MS->SSCHANNEL REQUEST3SS->MSIMMEDIATE ASSIGNMENT4MS->SSPAGING RESPONSE5SS->MSCHANNEL MODE MODIFY6MS->SSCHANNEL MODE MODIFY ACKNOWLEDGE7SS->MSCHANNEL MODE MODIFY8MS->SSCHANNEL MODE MODIFY ACKNOWLEDGE9SS->MSCHANNEL MODE MODIFY10MS->SSCHANNEL MODE MODIFY ACKNOWLEDGE11SS->MSCHANNEL MODE MODIFY12MS->SSCHANNEL MODE MODIFY ACKNOWLEDGE13SS->MSCHANNEL MODE MODIFY14MS->SSCHANNEL MODE MODIFY ACKNOWLEDGE15SS->MSCHANNEL RELEASE

在PDU Manager中的channel mode decode如下：
0 - Signalling Only (0x0)1 - Speech Full Rate or Half Rate Version 1 (0x1)33 - Speech Full Rate or Half Rate Version 2 (0x21)65 - Speech Full Rate or Half Rate Version 3 (0x41)129 - Speech Full Rate or Half Rate Version 4 (0x81)130 - Speech Full Rate or Half Rate Version 5 (0x82)131 - Speech Full Rate or Half Rate Version 6 (0x83)3 - Data, 12.0 Kbit/s Radio Interface Rate (0x3) 9600 bps11 - Data, 6.0 Kbit/s Radio Interface Rate (0xB) 4800 bps19 - Data, 3.6 Kbit/s Radio Interface Rate (0x13) 2400 bps
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