TCH Congestion Due To Traffic Unbalanced

 

TCH congestion due to traffic unbalanced

 

Date:29/Jun/2018

Author

Saurabh Mishra s00702322

Case Name

TCH congestion due to traffic unbalance unbalanced d

Description

In a country ‘B ‘ for 2G project there was high TCH congeson at one site. The customer informed that the trac was not balanced properly between DCS1800 and GSM900 and so the congeson happened on GSM900 band cell. Finding Root Cause:

Handling Process

Alarm Info: No service aecng alarm

I have have an anal alyz yzed ed th the e tra tracc an and d foun found d th that at th the e GSM9 GSM900 00 ce cell ll was was congested

So inially I have changed the general parameters to improve the KPI. Parameter change info as below, CRO from 2 to 8 (GSM 900 cells) RxMin from 8 to 6 (DCS 1800 cells) Trigger Layer (Pre 3 post 3) no change Lower the value of PBGT thresholds for outgoing handovers for faster handovers to neighboring G900 cells. Values can be set as following or even lower INTERCELLHYST INTERCELL HYST to 56 & PBGTMARGIN to 56 Restrict PBGT handovers to source cell by increasing the PBGT margin of the corresponding G900 neighbors as follows. Value changed to 76 is equal to 12 dB. Aer all these change the KPI is as follows, 2021-6-3

 

TCH congestion due to traffic unbalanced

 

Date:29/Jun/2018

The impr prov ovem emen entt wa wass go good od bu butt s sll ll co cong nges eso on n no re remo move ved d The im completely and there is sll scope of further optmizaon So I again did the analysis and now I found that the actual issue is that there is no TCH HR trac on Gkamboince_b1

I checked the parameters and found that the TCHAJFLAG was set to No. Then I changed it to Yes and TCH HR traffic started as usual and also the congestion removed completely.

2021-6-3

 

TCH congestion due to traffic unbalanced

Result

 

Date:29/Jun/2018

After 

optimization:

Mis hra ! Customer Remark: Well done Mishra Can you do the same on the sites that I have sent to you for balancing traffic please? Thanks!

2021-6-3