部分信令CAUSE参考
Channel Relea信令里面的Cau（事件号）对应的网络发生的事情，在这里我们可以看到很多网络释放的原因，例如：我们平时测试时，在被叫手机没有人接听或者正在通话的情况下，就会统计成一次连接失败，如果我们在报告里面仅仅用文字表达的话，说服力不强，但是要是在报告里面能说明Cau是17、19的话就很容易说服别人，还有拥塞也可以在信令里面看到Cau是34，除次以外还有很多Cau，可以看下表：
2、CM SERVICE REJECT
If the rvice request cannot be accepted, the network returns a CM SERVICE REJECT message to the mobile station.
The reject cau information element (e 10.5.3.6 and Annex G) indicates the reason for rejection. The following cau values may apply:
If no other MM connection is active, the network may start the RR connection relea
3、ATTACH REJECT
GPRS attach not accepted by the network
If the attach request cannot be accepted by the network, an ATT ACH REJECT message is transferred to the MS. The MS receiving the A TTACH REJECT message stops timer T3310 and takes one of the following actions depending upon the reject cau:
# 2(IMS I unknown in HLR)
# 3 (Illegal MS);
# 6 (Illegal ME)
The MS shall t the GPRS update status to GU3 ROAMING NOT A LLOWED (and shall store it according to ction 4.1.3.2) and shall delete any P-TMSI, P-TMSI signature, RAI and GPRS
ciphering key quence number. The new GMM state is GMM-DEREGISTERED. The SIM
shall be considered as invalid for GPRS rvices until switching off or the SIM is removed.
If the MS is IMSI attached via MM procedures, the MS shall in addition t the update status to U3 ROAMING NOT A LLOW ED, shall delete any TMSI, LAI and ciphering key quence number.
The new MM state is MM idle. The SIM shall be considered as invalid also for non-GPRS
rvices until switching off or the SIM is removed.
# 7 (GPRS rvices not allowed)
# 8 (GPRS rvices and non-GPRS rvices not allowed)
The MS shall t the GPRS update status to GU3 ROAMING NOT A LLOWED (and shall store it according to ction 4.1.3.2) and shall delete any P-TMSI, P-TMSI signature, RAI and GPRS ciphering key quence number. The SIM shall be considered as invalid for GPRS rvices until switching off or the SIM is removed. The new state is GMM-DEREGISTERED.
# 11 (PLMN not allowed)
# 12 (Location area not allowed);
# 13 (Roaming not allowed in this location area)
# 16 (MSC temporarily not reachable)
# 17 (Network failure);
# 22 (Congestion)
The MS shall delete any RAI, P-TMSI, P-TMSI signature, and GPRS ciphering key quence number stored, shall t the GPRS update status to GU3 ROAMING NOT A LLOW ED (and
shall store it according to ction 4.1.3.2) and shall change to state GMM-DEREGISTERED.
If the MS is IMSI attached via MM procedures, the MS shall in addition t the update status to U3 ROAMING NOT ALLOWED and shall delete any TMSI, LAI and ciphering key quence number. The new MM state is MM IDLE.
4、ROUTING AREA UPDATE REJECT
If the routing area updating cannot be accepted, the network nds a ROUTING AREA
UPDATE RE JECT message to the MS. An MS that receives a ROUTING A REA UPDATE
REJECT message stops timer T3330 . The MS shall then take different actions depending on
the received reject cau value:
5、ACTIV ATE PDP CONTEXT REJECT
Upon receipt of an ACTIV A TE PDP CONTEXT REQUEST message the network may reject the MS initiated PDP context activation by nding an ACTIV ATE PDP CONTEXT REJECT message to the MS. The message shall contain a cau code that typically indicates one of the following caus:
Upon receipt of the ACTIV A TE AA PDP CONTEXT REQUEST message the network may indicate the failure of the MS initiated AA PDP context activation by nding the ACTIV ATE AA PDP CONTEXT REJECT message to the MS. The message contains a cau code that typically indicates one of the following caus:
# 32: rvice option not supported # 90 - 111: protocol errors.
# 34: rvice option temporarily out of order The MS shall stop the timer T3380.
7、DISCONNECT
呼叫建立失败，BTS通常会向MS发信令DISCONNECT以指示呼叫建立失败的原因，从参考号中，我们可以推导出呼叫建立的失败原因。根据经验列出以下表格以供参考
