7/26/2019 IRAT Improvement
1/2
CS & PS IRAT Improvement
Steps to improve & parameter tuning for CS & PS IRAT
sucess rate improvement.
Kindly let me know the reasons for INTERRATPHYCHFAILNUM. Is it
only Physical channel not available in GSM system
*********************************
Following are some of the key parameters that can be tuned to
improve CS and PS IRAT HOSR;
1. gsmAmountPropRepeat
2. gsmPropRepeatInterval
3. gsmThresh3A
4. tCellChange
5. serviceOffset2d
6. fachMeasOccaCyclenCoeff
Return To Old Channel due to Physical Channel Failure in CS IRAT
is mostly caused due to high ICM band, BSIC/BCCH
issues etc on 2G network. For PS IRAT it is mostly due to lack
of data slots either due to preemption by speech calls or po
7/26/2019 IRAT Improvement
2/2
CS & PS IRAT Improvement
Steps to improve & parameter tuning for CS & PS IRAT
sucess rate improvement.
Kindly let me know the reasons for INTERRATPHYCHFAILNUM. Is it
only Physical channel not available in GSM system
*********************************
Starting With basic level:-
1. GSM cells definitions in RNC (All GSM cell information must
be updated & correct i.e BCCH , CI , LAC , BSIC etc)
2. If a lot of GSM neighbors defined to a single UTRANCELL
reduce it to sum less amount (6-8 GSM nbrs are enough pe
3. Chk GSM nbrs (removing duplicacy regarding same BCCH/BSIC
cells)
4. Thresholds & time to trigger for 2d & 3a.
5. change Qoffset1sn to a higher value (default is 0 make it to
5 for worst performing IRAT relations)
Physical channel fail is coz of bad coverage of GSM also , or
congestion in GSM network.
