bts onair procedure_sent alu ic (3)

TMA settingTMA

nh ngha:TMA l thit b khuych i tn hiu v nhiu ng ln, h tr tng vng ph v cht lng tn hiuTMA thng c lp st trn nh ct v st antennaNgun inNgun in cung cp cho TMA l ng in 1 chiu chy trong li cp Feeder t BTS ln AntennaTrong thit b ALU, cn phi khai bo thng s bt ngun in ny ln cung cp cho TMAc tnh TMA s t ng cho tn hiu qua trong trng hp mt ngun cung cp cho TMACch lmChnh sa v khai bo thng s dng phn mm BTS terminal ca Alcaltel BTS 9100, kt ni trc tip vo BTS khai boTnGi tr khai boTMA Threshold=70mATMA Threshold=200mAAntenna Feeder Loss3TMA TX Loss0.5TMA RX Gain12V dKhi no cn lp t TMAYu cuVng ph ca cell tng i xaCng sut pht trung bnh ca MS ti 30dbm, ly thng tin t NPOKim tra Link Unbalance gia ng ln v ng xung, chng ta tnh ton cc gi tr sauGi tr ng ln Uplink =BTS Avg Receive Power-BTS sensitive (gi tr bng 114dbm)Gi tr ng xung Downlink = MS Avg Reveive Power -MS Sensitive (gi tr bng 102dbm)-->do ta c gi tr Link balance value =Downlink value- Uplink value = MS Avg Receive value- BTS Avg Receive Power +12Nu Link balance value