Hello Everyone.
A classic 2G question: What could cause this issue for two GSM900 cells on the same site?
The site is rural, and all conventional configurations have been checked, including LAC with MSC.
This sudden increase/decrease is significantly affecting CSSR.
Were any actions taken during this time window?
No, not from WL at least.
By the way, the cell in green has been impacted for some time.
Could it be faulty hardware, such as a TRX?
It seems like congestion, doesn’t it?
Do you have any congestion events?
Not according to the counters.
Did the TA increase during the peak?
Probably not, but I’ll check.
I have reduced the TRX power on previous occasions, but there was no obvious impact.
I think it’s a cross-feeder issue.
The time window is fairly large, so I guess a field engineer or quality team might have changed the antenna connections.
Oh! Besides DT, can it be verified through OSS?
Yes, by checking the number of attempts.
Look at the number of attempts for each cell before and during the spike.
You can sum the data over 2 to 3 hours; that should be sufficient.
What should I expect?
Neighbors change.
Open the map and check the neighbors.
They should be swapped before and during the spike.
Hmmm, I see.
Good point! I’ll check it and get back to you.
Thanks again!
Hello, I actually checked onsite, and unfortunately, there was no crossover.
You won’t find it in the field as per your trend the issue is already resolved.
But you want to know the suspected root-cause.
Only NBR attempts will save you.
Actually, the CSSR is still low for the relevant cell.
The sector in use is old, so I advised the transmission team to check it.
This has happened before, but the difference is that there were VSWR spikes previously.
Oh, okay. Please share the full picture once the root cause is identified. Thanks!
This is temporary degradation? Had experience with failure of electric meter with sim)), which spamming and use sdcch, so it may be equipment failure.
