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Member
Reputation: 119
The cause code is : IMSI unknown in VLR
Hi all,
I faced a call rejection on a site 6 successive times !!
all of them are noted as "Call was released by the network via CM Service Reject Message"The cause code is : IMSI unknown in VLR
could any one help me resolving this issue ?
please note that the call was successfully established in the 7th attempt.
CPICH RSCP = -68, Ec/No = -5
Thanks a lot helpful friends
Eri
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2011-04-19 11:14 PM
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Member
Reputation: 109
Re: The cause code is : IMSI unknown in VLR
Hi,
You should chekc the Charging systesm (are you using pre-Paid sim card for drive testing?)
also check the TMSI allocation limits in core,you migh not have enought TMSI to be allocated to all subscribers.
BR
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Member
Reputation: 73
Re: The cause code is : IMSI unknown in VLR
What's the exact call sequence?
Was the mobile in a location area border?
Which vendor's MSC-VLR?
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Member
Reputation: 149
Re: The cause code is : IMSI unknown in VLR
1. What number do you call? Mobile phone to Mobile phone or spesific number to make test call (operator served some number in MSS to make DT longcall)
2. Using post or pre (some operator using postpaid connected to IN like Prepaid)
3. handset/UE for Anum and Bnum on good condition?
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Member
Reputation: 73
Re: The cause code is : IMSI unknown in VLR
Is your RAN system using MSC pool function? If the MSCs in the pool malfunction, you may face this scenario in certain cells until your mobile does a location update successfully with one of MSC, then you can make call again.
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Member
Reputation: 69
Re: The cause code is : IMSI unknown in VLR
Hi
You need to see the IMSI Series , Is it belong to your own Network or Roamers. If Roamers might not be open in your MSC/VLR.
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Senior Member
Reputation: 379
Re: The cause code is : IMSI unknown in VLR
I did encountered this issue at Inter-RNC border(Lets say i am crossing from RNCA to RNCB) where my IMSI was registered to VLR of RNCA, but call attempting was did on RNCB where my IMSI was not yet registered to its VLR yet and this leads to call attempt failure. I did perform idleQoffset2sn tuning to fasten the cell reselection at those area but it seems not much help for this issue to be resolve.
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Senior Member
Reputation: 379
Re: The cause code is : IMSI unknown in VLR
Anyone can suggest on action for the resolve of this issue?
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Member
Reputation: 53
Re: The cause code is : IMSI unknown in VLR
HI kentck86
Could you give me more detail, Are these two RNC belong to two different MSC? and which vendor of RNC and MSC, Because i've face the problem before when i cross the border of 2 MSC.
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Senior Member
Reputation: 379
Re: The cause code is : IMSI unknown in VLR
Originally Posted by
takeiteasy612
HI kentck86
Could you give me more detail, Are these two RNC belong to two different MSC? and which vendor of RNC and MSC, Because i've face the problem before when i cross the border of 2 MSC.
It is in same MSC under Huawei network. Any advice?
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