Sdcch drop improvement

1. SDCCH Drop improvement
RBS2202 Cabinet sites
Chennai - Bharti (Airtel) Network

2. OVER VIEW
› High SD Drop found in most of the RBS2202 Cabinet
(Master Cabinet – 900 Band) in combination with
Other Slave Cabinets (1800 Band) Expansion Sites
(MBC Site)
›All the Drops (Cndrop) are Other reason drops
Ericsson Internal | 2011-11-21 | Page 2

3. Action taken
 SD Shifting
drop
SD carrying time slot shifted
SD carrying TRX shifted
SD SD carrying Channel group shifted (like CHGR-high 0 to CHGR-1).
still actions the After all Ericsson Internal | 2011-11-21 | Page 3
Physical Audit
Cable Swap verified
Jumper to feeder cable Connection verified
Antenna faulty verified
Re Loading
TRX Swap and Replaced
TG Restart given
Hard Reset given
Site delete and recreation done.
Drive Test
Multiple calls initiated

4. Solutions
› Chennai Network Drop1% improved from 95.5 to 96.
Drop1% improved from 95.5 to 96.
› After above all the actions still high SD drop was observed.
› Trail basis two cells taken and SCLDSC settings Changed
from OL to UL.
› SD Drop was improved and no other reason drop found.
› All the RBS2202 cabinet with expansion sites dump taken
and changed the SCLDSC setting.
Ericsson Internal | 2011-11-21 | Page 4

5. KPI TREND
Ericsson Internal | 2011-11-21 | Page 5
Chennai BBH D1%
96.50
96.00
95.50
95.00
94.50
94.00
93.50
93.00
92.50
3.00
2.50
2.00
1.50
1.00
0.50
1-Nov
3-Nov
5-Nov
7-Nov
9-Nov
26-Oct
28-Oct
30-Oct
1-Dec
11-Nov
13-Nov
15-Nov
17-Nov
19-Nov
21-Nov
23-Nov
25-Nov
27-Nov
29-Nov
Drop1%
Linear
2202 Sites KPI Trend
100
90
80
70
60
50
40
30
20
10
0
14-Nov
15-Nov
16-Nov
17-Nov
18-Nov
19-Nov
20-Nov
21-Nov
22-Nov
23-Nov
24-Nov
25-Nov
26-Nov
27-Nov
28-Nov
29-Nov
30-Nov
1-Dec
2-Dec
3-Dec
4-Dec
5-Dec
6-Dec
0.00
CN drop Other reason Drop TCH Blk% D1% D3% Sd Blk%

6. Observation
› Problem due to Sync issue between 2202 cabinet to some other
cabinet (MBC cabinet).
› Sync issue problem analysis under progress.
Ericsson Internal | 2011-11-21 | Page 6