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Reply To: TRX

#46125
pix
Guest

mirza,

call drop on the TCH channels and SDCCH congestion are different issues, therefore adding SDCCH capacity won’t help.

sammi,

are you having SDCCH drops or TCH drops ? I guess it is TCH drops (= call drops)

The last trx of the cell is usually the one that carries the highest amount of traffic. Because you lock the TRX #4, the traffic is now being mostly carried by TRX #3. Therefore, check interferences…

You says “there are more intracell HO”. Well, maybe it is because the TRX3 is interfered, therefore most of the traffic is interfered. It leads to a higher amount of interference HO than before. For instance, before locking, there was 80% of calls on TRX4, with good quality. And 20% on TRX3, with poor quality due to interference.

After locking : 0% on trx4, 80% on trx3 and 20% on trx2. Maybe there is interference on trx3, or possibly trx2. You need to check indicators per TRX. I can’t tell you where you can find them in Siemens because i work with a different vendor, but you’re supposed to know 😉

To conclude, i’d say you really need to investigate more into details your problem : more indicators (tch mean duration, per trx, tch assignment failure, sdcch drops), more drive-tests, and try to lock other TRX instead of TRX4.

And finally, check your frequencies !! are you using frequency hopping ?

good luck…