Symptoms:
From the drive test, following symptoms will be observed by using TEMS:
From the drive test, following symptoms will be observed by using TEMS:
• Received Ec/No of the pilot channel is less than –16dB and
• Received RSCP of the pilot channel is high enough to maintain the connection,e.g. >- 100dBm and
• DL RSSI is very high and
• The connection finally drops.
Reason 1 – no dominant cell
Solution:The most direct and effective way to solve this problem is to increase the pilot channel power Primary CPICH power of the desired cell.
Reason 2 – dominant interferer
Solution:The simplest solution to overcome this problem is to include the overshooting cell into the neighboring cell list. This means the interferer now becomes a useful radio link.
Reason 3 – low best serving PPilot/PTot
Solution:The received Ec/No of the best serving pilot channel is very low (near or less than –16dB) even though there is no other cell. It means the pilot power setting is not large enough to fulfill existing downlink load.
Solution 1
The best solution is to add a new site with “good coverage control” at the problematic area.
Solution 2
The direct but ineffective solution is to increase the pilot channel power Primary CPICH power of the problematic cell. With high pilot power, the common channel powers and the required power for the downlink DPCHs will be increased. At the end, the ratio of the PPilot/PTot does not increase much.
Solution:The most direct and effective way to solve this problem is to increase the pilot channel power Primary CPICH power of the desired cell.
Reason 2 – dominant interferer
Solution:The simplest solution to overcome this problem is to include the overshooting cell into the neighboring cell list. This means the interferer now becomes a useful radio link.
Reason 3 – low best serving PPilot/PTot
Solution:The received Ec/No of the best serving pilot channel is very low (near or less than –16dB) even though there is no other cell. It means the pilot power setting is not large enough to fulfill existing downlink load.
Solution 1
The best solution is to add a new site with “good coverage control” at the problematic area.
Solution 2
The direct but ineffective solution is to increase the pilot channel power Primary CPICH power of the problematic cell. With high pilot power, the common channel powers and the required power for the downlink DPCHs will be increased. At the end, the ratio of the PPilot/PTot does not increase much.
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