dremka
2011-11-24, 04:03 AM
Hi.
I've got several WCDMA cells with relatively high interference level (RTWP levels ~ -90 to -85 dBm). The interferer is known but there is no chance to switch it off.
Assumptions:
- changing antenna height or direction is useless - there are several interference sources geographically scattered and located relatively high.
- antenna tilting gives some effect but it ends up with RTWP ~ -90 dBm with tilts 10 deg.
- filters are useless - interference falls directly into receive band.
As high RTWP shrinks uplink cell coverage I think about PCPICH power lowering to balance downlink and uplink coverage (assuming high RTWP as increased noise factor in the BTS receiver), but to achieve this PCPICH needs to be lowered as much as 10 to 15 dBs (only several hundred meters served by these cells [900 MHz] but - served).
Has anyone optimised such kind of problem? What do you think about it? Any suggestions?
Thx in advance,
I've got several WCDMA cells with relatively high interference level (RTWP levels ~ -90 to -85 dBm). The interferer is known but there is no chance to switch it off.
Assumptions:
- changing antenna height or direction is useless - there are several interference sources geographically scattered and located relatively high.
- antenna tilting gives some effect but it ends up with RTWP ~ -90 dBm with tilts 10 deg.
- filters are useless - interference falls directly into receive band.
As high RTWP shrinks uplink cell coverage I think about PCPICH power lowering to balance downlink and uplink coverage (assuming high RTWP as increased noise factor in the BTS receiver), but to achieve this PCPICH needs to be lowered as much as 10 to 15 dBs (only several hundred meters served by these cells [900 MHz] but - served).
Has anyone optimised such kind of problem? What do you think about it? Any suggestions?
Thx in advance,