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Member
Reputation: 72
how to decrease RRC and RAB fail due to NoReply
Dear Expert 3G,
i have problem on 3G huawei network,
bad accessibility cause more RRC and RAB fail due to NoReply (coverage problem).
can you help me to give some solution ?
Many thanks ,
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2012-10-25 05:59 PM
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Re: how to decrease RRC and RAB fail due to NoReply
well, you should try to improve the Uu interface, this mean, improve the coverage
maybe you can start checking the TP distribution to check from the office how is the coverage and the interference of the sites, but the best option should be Drive Test
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Member
Reputation: 47
Re: how to decrease RRC and RAB fail due to NoReply
Originally Posted by
indrarui_costa
Dear Expert 3G,
i have problem on 3G huawei network,
bad accessibility cause more RRC and RAB fail due to NoReply (coverage problem).
can you help me to give some solution ?
Many thanks ,
did you check Rach delays ? it is helpful to know if the people is close to your antenna or not.
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Member
Reputation: 22
Re: how to decrease RRC and RAB fail due to NoReply
You should check your SPU overload, and do some rehoming some sites with big traffic to balance / reduce the board load..
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Member
Reputation: 72
Re: how to decrease RRC and RAB fail due to NoReply
Originally Posted by
The_Rf
well, you should try to improve the Uu interface, this mean, improve the coverage
maybe you can start checking the TP distribution to check from the office how is the coverage and the interference of the sites, but the best option should be Drive Test
Can we adjust some parameter to reduce it ? and what parameter can be do it?
many thanks,
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Member
Reputation: 33
Re: how to decrease RRC and RAB fail due to NoReply
- check distance of user by TP,, adj tilt
- check RTWP
- try to increase parameter T381
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Re: how to decrease RRC and RAB fail due to NoReply
Originally Posted by
indrarui_costa
Can we adjust some parameter to reduce it ? and what parameter can be do it?
many thanks,
first need to check if is coverage, maybe the DL coverage is OK but there is so many noise in the uplink
if need more downlink coverage maybe can add power to the DL channels (pcpich), this can improve the coverage on some cells but if is not enough carefull also will put more Ec/Io in the air, so be carefull
if the RTWP is high (uplink coverage), this is more complicated to reduce, maybe check the propagation of the cells and try to reduce the coverage, the best option to be clear is to do a drive test, but is expensive, other option is to check the TP (or PD dont remember the right name) that is the same thath RACH delay that oswe propossed
BR
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Member
Reputation: 24
Re: how to decrease RRC and RAB fail due to NoReply
Originally Posted by
pongpang
- check distance of user by TP,, adj tilt
- check RTWP
- try to increase parameter T381
What value of T381 we should use, the default value is 600ms.
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Member
Reputation: 33
Re: how to decrease RRC and RAB fail due to NoReply
Originally Posted by
daohuyhp
What value of T381 we should use, the default value is 600ms.
the first, try to set to D800 (800ms)
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Member
Reputation: 24
Re: how to decrease RRC and RAB fail due to NoReply
Originally Posted by
pongpang
the first, try to set to D800 (800ms)
Is there any parameters at cell level can help us fix this problem?
I don't want to change RNC parameters because the RNC KPI is good.
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