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Immediate Assignment failure
Hi all ,
What is the reason of Immediate Assignment failure in idle mode?
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2009-06-24 05:26 PM
# ADS
Circuit advertisement
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Users Awaiting Email Confirmation
Reputation: 47
Reasons of immediate assignment failure
Dear,
Reasons below:
- SDCCH Congestion
- Phantom or dummy RACH,
- H/W (TRX, Combiner, diplexers, VSWR)
- Radio (Coverage, Interference, DL/UL unbalance, ...)
I hope can help,
Regards
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Member
Reputation: 91
also we have expired timers and co bcch and co bsic === phantom rach
(T10 < T_MSRFPCI),
FR call: (T_MSRFPCI Expiry)
FR call: (T10 Expiry)
Unsuccessful TCH assignment procedure LAPDm I-Frame
with ASSIGNMENT COMMAND not acknowledged by MS
(T200 Expiry), FR call
Last edited by ghassen; 2009-06-24 at 08:12 PM
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Senior Member
Reputation: 502
Totally all the mentioned reasons posted are causes and if you want to be sure why you have this fail it is beteer to check what the requirement for channel request(MOC,MTC,location update,ememrgency,,,,,,,) ao when you find your request is high for one of them you can understand what is causes.
BR
RF
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Dear friend thanks for your help
Finally i found the problem!
Problem was in radio link LOS!! after radio realignment problem solved
Regards
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Member
Reputation: 91
Originally Posted by
electron
Dear friend thanks for your help
Finally i found the problem!
Problem was in radio link LOS!! after radio realignment problem solved
Regards
then it was T_MSRFPCI counter EXPIRED???
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Originally Posted by
ghassen
then it was T_MSRFPCI counter EXPIRED???
N200 Expired !
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Senior Member
Reputation: 491
Friends, can you give me some information about Phantom RACH
and how to optimize it?
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Senior Member
Reputation: 502
Originally Posted by
justdream
Friends, can you give me some information about Phantom RACH
and how to optimize it?
Phantom RACH is kind of non real channel request some time BTS decode noise as channel request and you can reduce it by change Parameter related to RACH and RX leve access min or RACH access min
BR
RF
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Senior Member
Reputation: 491
Originally Posted by
RF engineer
Phantom RACH is kind of non real channel request some time BTS decode noise as channel request
BR
RF
Thanks but in this way, can subcounters count the total number of Phantom RACH
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