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CS Drop after IRAT HO
Hi,
Currently am experiencing a problem, after 3G (operator 1) to 2G (operator 2) handover occurs the call drops in about 3-4 seconds. Experienced this problem while drive testing using W995 and also while using my personal phone Xperia X1. Operator 1 and 2 share 3G network among them. Any Idea what could be the cause?
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2011-07-27 11:55 PM
# ADS
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Member
Reputation: 39
Re: CS Drop after IRAT HO
Originally Posted by
fon909
Hi,
Currently am experiencing a problem, after 3G (operator 1) to 2G (operator 2) handover occurs the call drops in about 3-4 seconds. Experienced this problem while drive testing using W995 and also while using my personal phone Xperia X1. Operator 1 and 2 share 3G network among them. Any Idea what could be the cause?
If it is not in one place, if course core parts of operators
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Member
Reputation: 101
Re: CS Drop after IRAT HO
Could be due to inapprpriate inter-system neighbouring lists
are you sure you have the most optimum gsm candidates?
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Member
Reputation: 39
Re: CS Drop after IRAT HO
Originally Posted by
boring
Could be due to inapprpriate inter-system neighbouring lists
are you sure you have the most optimum gsm candidates?
As i understand from explanation this problem exists on all Network. I hope he doesn't have so huge inter-system neighbouring problem
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Member
Reputation: 154
Re: CS Drop after IRAT HO
Originally Posted by
fon909
Hi,
Currently am experiencing a problem, after 3G (operator 1) to 2G (operator 2) handover occurs the call drops in about 3-4 seconds. Experienced this problem while drive testing using W995 and also while using my personal phone Xperia X1. Operator 1 and 2 share 3G network among them. Any Idea what could be the cause?
Hello there,
This is a HHO problem. First you need to determine if it is a global problem in the whol enetwork or if it is specific to few cells.
Second determine the problematic cells by looking into KPIs specific to both 3G and 2G vendors.
To start with you need to check if neighbors are well defined in MSC, BSC, and RNC. After completing this check,
The following solution can be followed,
a. Increasing CIO (Cell Individual Offset)
b. Increasing threshold for initiating and stopping compressing mode.
c. Increasing the threshold to handover to GSM.
I hope this could help you to solve the problem.
Regards,
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Re: CS Drop after IRAT HO
Thanks for your replies.
@jimjim: this is a global problem persistent throughout the network.
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Member
Reputation: 39
Re: CS Drop after IRAT HO
Originally Posted by
fon909
Thanks for your replies.
@jimjim: this is a global problem persistent throughout the network.
It means only core-core problem. Possible to run trace and find the reason of problem.
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Member
Reputation: 29
Re: CS Drop after IRAT HO
IRAT handover parameters are not defined correctly
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