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:

I n   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:
Step
Direction
Message
1
SS->MS
PAGING REQUEST TYPE 1
2
MS->SS
CHANNEL REQUEST
3
SS->MS
IMMEDIATE ASSIGNMENT
4
MS->SS
PAGING RESPONSE
5
SS->MS
CHANNEL MODE MODIFY
6
MS->SS
CHANNEL MODE MODIFY ACKNOWLEDGE
7
SS->MS
CHANNEL MODE MODIFY
8
MS->SS
CHANNEL MODE MODIFY ACKNOWLEDGE
9
SS->MS
CHANNEL MODE MODIFY
10
MS->SS
CHANNEL MODE MODIFY ACKNOWLEDGE
11
SS->MS
CHANNEL MODE MODIFY
12
MS->SS
CHANNEL MODE MODIFY ACKNOWLEDGE
13
SS->MS
CHANNEL MODE MODIFY
14
MS->SS
CHANNEL MODE MODIFY ACKNOWLEDGE
15
SS->MS
CHANNEL 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 bps
11 - Data, 6.0 Kbit/s Radio Interface Rate (0xB)      4800 bps
19 - Data, 3.6 Kbit/s Radio Interface Rate (0x13)      2400 bps

 
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             data 12 Kb/s 
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