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
• 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.
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
相关PICS
-
GSM FR (TSPC_AddInfo_Full_rate_version_1)
-
GSM FR (TSPC_AddInfo_Full_rate_version_2)
-
GSM FR (TSPC_AddInfo_Full_rate_version_3)
-
GSM FR (TSPC_AddInfo_Full_rate_version_4)
-
GSM FR (TSPC_AddInfo_Full_rate_version_5)
-
GSM FR (TSPC_AddInfo_Full_rate_version_6)
-
9.6 k full rate data mode (TSPC_AddInfo_96Data)data 12 Kb/s
-
4.8 k full rate data mode (TSPC_AddInfo_48DataF)data 6 Kb/s
-
2.4 k full rate data mode (TSPC_AddInfo_24DataF)data 4.8 Kb/s
