tasr kpi.pptx
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TA SR 1) N o dom inantserving cell: The serving cell cannotcope w ith the TCH traffic. 2)Severe congestion on TCH : Failing TCH allocation forassignm entorhandover due to congestion 3)Low signal strength forcallaccess: The signalstrength m ightbe higheron the BCCH than on the TCH . 4)Interference: D isturbance on SD CCH ortargetTCH 5)Faulty transceiver: Faulty equipm ent The follow ing procedure should be perform ed forTCH Assignm entanalysis: ForTCH assignm entsuccess rate, the firstthing,check the TCH Tim e Congestion. Ifthere is congestion on TCH , itis recom m end doing the dim ensioning and adding TRU based on carried TCH traffic dem and. Ifthere is no congestion on TCH , check the outputpow erofthe BTS. Ifthe output pow erislow , increase the outputpow er. Ifthe outputpow erisok, check the faulty BTS by extracting BTS errorlog. Ifhardw are faultfound, sw ap orrepairH W . Perform drivetests to check the coverage and received RxLEV. Ifno dom inantcellorsim ilarsignal strengths ofa few cells found during drivetests, itisrecom m ended to add BTS. Ifthere is no problem on the dom inantcell, check the interference w hetherco- channeloradjacentchannel. Check the disturbance w hetheritison SD CCH ortargetTCH . Ifdisturbance found, im prove the frequency plan. M ostly, the problem soflow TCH assignm entare TCH availability and interference.
Transcript of tasr kpi.pptx
TASR
1) No dominant serving cell: The serving cell cannot cope with the TCH traffic. 2) Severe congestion on TCH: Failing TCH allocation for assignment or handover due to congestion 3) Low signal strength for call access: The signal strength might be higher on the BCCH than on the TCH. 4) Interference: Disturbance on SDCCH or target TCH 5) Faulty transceiver: Faulty equipment The following procedure should be performed for TCH Assignment analysis: For TCH assignment success rate, the first thing, check the TCH Time Congestion. If there is congestion on TCH, it is recommend doing the dimensioning and adding TRU based on carried TCH traffic demand. If there is no congestion on TCH, check the output power of the BTS. If the output power is low, increase the output power. If the output power is ok, check the faulty BTS by extracting BTS error log. If hardware fault found, swap or repair HW. Perform drivetests to check the coverage and received RxLEV. If no dominant cell or similar signal strengths of a few cells found during drivetests, it is recommended to add BTS. If there is no problem on the dominant cell, check the interference whether co-channel or adjacent channel. Check the disturbance whether it is on SDCCH or target TCH. If disturbance found, improve the frequency plan. Mostly, the problems of low TCH assignment are TCH availability and interference.
