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善于提问，勤于回答，你也是专家
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被叫位置区更新完不释放，直接收SETUP消息，振铃后自动路测设备不接听
在使用鼎利自动路测设备测试中，被叫在跨LAC或者从G网重选回TD，位置区更新完没有进行释放，而是直接收到SETUP、RAB建立、振铃，测试设备振铃后不进行接听。
这种情况在LAC边界出现非常频繁，有人见过这种情况吗？这是核心网开的什么功能吗？
这种情况在LAC边界出现非常频繁，有人见过这种情况吗？这是核心网开的什么功能吗？
我要回答
问题答案
有一种情况阿，i你查查location updating里面有没有一项Follow on proceed啊？
如果有就是msc有意要保留rrc or rr连接，为后续的mm操作做铺垫（不需要重建AS层连接了），就是这个：
If the network wishes to prolong the RR connection to allow the mobile station to initiate MM connection establishment (for example if the mobile station has indicated in the LOCATION UPDATING REQUEST that it has a follow-on request pending) the network shall send "follow on proceed" in the LOCATION UPDATING ACCEPT and start timer T3255.
LOCATION UPDATING ACCEPT message content
如果有就是msc有意要保留rrc or rr连接，为后续的mm操作做铺垫（不需要重建AS层连接了），就是这个：
If the network wishes to prolong the RR connection to allow the mobile station to initiate MM connection establishment (for example if the mobile station has indicated in the LOCATION UPDATING REQUEST that it has a follow-on request pending) the network shall send "follow on proceed" in the LOCATION UPDATING ACCEPT and start timer T3255.
LOCATION UPDATING ACCEPT message content
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IEI |
Information element |
Type/Reference |
Presence |
Format |
Length |
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Mobility management |
Protocol discriminator |
M |
V |
½ |
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protocol discriminator |
10.2 |
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Skip Indicator |
Skip Indicator |
M |
V |
½ |
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10.3.1 |
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Location Updating |
Message type |
M |
V |
1 |
|
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Accept message type |
10.4 |
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|
|
Location area |
Location area |
M |
V |
5 |
|
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identification |
identification |
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|
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10.5.1.3 |
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|
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|
17 |
Mobile identity |
Mobile identity |
O |
TLV |
3-10 |
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10.5.1.4 |
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|
A1 |
Follow on proceed |
Follow on proceed |
O |
T |
1 |
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10.5.3.7 |
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A2 |
CTS permission |
CTS permission |
O |
T |
1 |
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10.5.3.10 |
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|
4A |
Equivalent PLMNs |
PLMN list |
O |
TLV |
5-47 |
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10.5.1.13 |
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|
34 |
Emergency Number List |
Emergency Number List 10.5.3.13 |
O |
TLV |
5-50 |
|
35 |
Per MS T3212 |
GPRS Timer 3 10.5.7.4a |
O |
TLV |
3 |
回答者：ebrain68 回答时间：2014-07-30 12:26
15
16你好，我看了下，位置区更新后不释放和释放的信令中都带有 No Follow-on request pending,意思是没有后续业务要进行，但是为什么后续没有释放而是直接进行了被叫呼叫呢？
location updating信令如下
Title：UL MM Location Updating Request
Time：15:06:33.309
Location Updating Type:
LUT: Normal Location Updating
For: No Follow-on request pending
Ciphering Key Sequence Number: 3
Location Area Identification:
MCC: 460
MNC: 00
LAC: 46432
Mobile station class mark:
RF Power capability: Reserved
A5/1 Algorithm supported: Available
Revision level: Used by phase 2 mobile stations
Controlled early classmark sending option: Implemented in the MS
Mobile Identity:
Type of Identity: TMSI/P-TMSI
ODD/EVEN Indication: Even Number of Identity Digits And Also When The TMSI/P-TMSI Is Used
Identity Digits: 1403173670(0x53a2bb26)
location updating信令如下
Title：UL MM Location Updating Request
Time：15:06:33.309
Location Updating Type:
LUT: Normal Location Updating
For: No Follow-on request pending
Ciphering Key Sequence Number: 3
Location Area Identification:
MCC: 460
MNC: 00
LAC: 46432
Mobile station class mark:
RF Power capability: Reserved
A5/1 Algorithm supported: Available
Revision level: Used by phase 2 mobile stations
Controlled early classmark sending option: Implemented in the MS
Mobile Identity:
Type of Identity: TMSI/P-TMSI
ODD/EVEN Indication: Even Number of Identity Digits And Also When The TMSI/P-TMSI Is Used
Identity Digits: 1403173670(0x53a2bb26)
那可能就不是这个情况，你可以再看看location update accept中的这个的设定
