asifhaider919
2011-11-12, 09:21 AM
I am working NSN S14, with below problem.
Sudden increase of SDCCH REQ, the increased cause is SDCCH_LU_ATTEMPT, SDCCH resources are assigned and then there is no established indication. T3101 expires so I have High SDCCH ABIS FAIL
The problem is random and starts mostly after midnight and automatically resolves after an average of 6-8 hours.
The sites are not on LA border, are present in same BSC and Same MSC.
There is no specific pattern of occurence of this behaviour, it random will appear on any site. I have dual BCCH network the colocated cells are impacted usually together but not always. But geographically the problem is not centered to some particular area, its spread.
There is no problem of C0-BCCH/BSIC
This cannot be a GHOST access as the casue is LU attempt and, GHOST cannot always be an LU but a random distribution over all causes, counter GHOST CCCH is nearly equal to zero.
Also one thing noticed is that although the problem resolves automatically after few hours, if the sector is reset it resolves at the same time.
Nothing could be observed during the drive test, there were no failures in the drive test.
I just surfed the web and saw some people of other vendors talking about the same problem but with no conclusion.
There are no RAJ Rejections, no AGCH overload, no channel activation failures, no Busy Attempt
The difference between SDCCH_LU_ATTEMPT - SDCCH_LOC_UPD = nearly equal to T3101 Timer Expiry
SDCCH_LU_ATTEMPT = no of SD request with casue location update
SDCCH_LOC_UPD = no of successful LOC update
an example case:
SDCCH_REQ = 1000
SDCCH_SEIZURE_ATTEMPTS =1000
SDCCH_LU_ATTEMPT = 900
SDCCH_LOC_UPD = 50
SDCCH_LU_ATTEMPT_FAIL=0
SDCCH ABIS FAIL CALL = 850
T3101 Expiry = 850
Expecting some good replys :)
Sudden increase of SDCCH REQ, the increased cause is SDCCH_LU_ATTEMPT, SDCCH resources are assigned and then there is no established indication. T3101 expires so I have High SDCCH ABIS FAIL
The problem is random and starts mostly after midnight and automatically resolves after an average of 6-8 hours.
The sites are not on LA border, are present in same BSC and Same MSC.
There is no specific pattern of occurence of this behaviour, it random will appear on any site. I have dual BCCH network the colocated cells are impacted usually together but not always. But geographically the problem is not centered to some particular area, its spread.
There is no problem of C0-BCCH/BSIC
This cannot be a GHOST access as the casue is LU attempt and, GHOST cannot always be an LU but a random distribution over all causes, counter GHOST CCCH is nearly equal to zero.
Also one thing noticed is that although the problem resolves automatically after few hours, if the sector is reset it resolves at the same time.
Nothing could be observed during the drive test, there were no failures in the drive test.
I just surfed the web and saw some people of other vendors talking about the same problem but with no conclusion.
There are no RAJ Rejections, no AGCH overload, no channel activation failures, no Busy Attempt
The difference between SDCCH_LU_ATTEMPT - SDCCH_LOC_UPD = nearly equal to T3101 Timer Expiry
SDCCH_LU_ATTEMPT = no of SD request with casue location update
SDCCH_LOC_UPD = no of successful LOC update
an example case:
SDCCH_REQ = 1000
SDCCH_SEIZURE_ATTEMPTS =1000
SDCCH_LU_ATTEMPT = 900
SDCCH_LOC_UPD = 50
SDCCH_LU_ATTEMPT_FAIL=0
SDCCH ABIS FAIL CALL = 850
T3101 Expiry = 850
Expecting some good replys :)