1、ExampleProblemHigh drop call rateFailing ing and intracell handovers in the cellTaskSolve the problem by finding the reason for the bad performanceYou can ask for additional information or propose actionsTCH Drop Call RatioTCH Drop Call Ratio/dcr_3a93.3%77.1%Drop call ratio components:TCH_RADIO_FAIL

2、/c101325.25%23.96%TCH_ABIS_FAIL_CALL/c10849.0.9%6.25% TCH_A_IF_FAIL_CALL/c10870.00%0.00% TCH_TR_Fail/c10290.08% 0.00% TCH_LAPD_FAIL/c10460.00% 0.00% TCH_BTS_FAIL/c10470.00% 0.00% TCH_USER_ACT/c10480.00% 0.00% TCH_BSCU_RESET/c10490.00% 0.00% TCH_NEWT_ACT/c10500.00% 0.00% TCH_ACT_FAIL_CALL/c10810.00%

3、0.00% TCH_RF_OLD_HO/c101458.92% 46.88% TCH_ABIS_FAI_OLD/c10850.00% 0.00% TCH_A_IF_FAIL_OLD/c10880.38% 0.00% TCH_TR_FAIL_OLD/c10300.00% 0.00% Uplink Interference Average Busy Hour UL interference (time out band 1) ./itf_1 100.00 % 100.00 %. time in band 1 ( -110dBm = B1 = -105dBm ) 0.00 % 0.00 %. tim

4、e in band 2 ( -105dBm B2 = -100dBm ) 0.00 % 0.00 %. time in band 3 ( -100dBm B3 = -95dBm ) 0.00 % 0.00 %. time in band 4 ( -95dBm B4 = -90dBm ) 0.00 % 0.00 %. time in band 5 ( -90dBm B5 -48 9 2 3 6 13 14 22 5 4 -100 0 0 0 0 0 0 0 0 -95 0 0 0 0 0 0 0 0 -90 0 0 0 0 0 0 0 0 -80 0 0 0 0 0 0 0 19 -70 0 0

5、 1 5 11 15 16 5 -48 12 3 6 5 2 0 0 0 Drive Test ResultDrive test with Nokia NMSX tool doneExperience:Close to site call setup possible150m 5 out of 30 attempts successfulLayer 3 messages show there is no response at all from the BTSBTS receiver not able to decode messages from MSConclusionVery high wideband interference level on uplink (both channels affected)Call setups close to BTS possilble C/I level acceptableDistant call setups impossible interference stronger than sig