LUMBUTRBKSMD_ND196 | Interference (Wave Propagation)

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nd196
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  Execution of 196 started.Collecting data from objects table... Wait.Collecting data from p_nbsc_power table... Wait.Analyzing frequency changes from p_nbsc_power table... Wait.Collecting data from p_nbsc_rx_qual table... Wait.Collecting the min call samples per trx for each cell... Wait.Collecting the max call samples per trx for each cell... Wait.Joining the max call values and min call values... Wait.Combining data... Wait.Collecting data from p_nbsc_power on hourly level... Wait.================================================================================= UL AND DL QUALITY, UL INTERFERENCE PER TRX,= 24-HOUR/10-DAY BREAKDOWNS== Network: PLMN= Area: BCF: N_LUMBUTRBKSMD (91)= Period: from 20091107 to 20091107= Thresholds: call time >= 1(min) and= (UL or DL q5 < 98 %) and= Avg. interf. band > 1)= Sorting (part 1): by ul_5 asc== Output selections:= Interference profiles (part 2): Not generated= Frequency profiles (part 3): Not generated================================================================================. **********************. Background information. Quality classes. **********************The quality classes are as defined in GSM recommendation GSM 05.08 (8.2).The calls are sampled every 480 ms for the quality class. Quality class info isused on Abis but BSC converts the quality classes into BER % figuresusing the default values. (Power control measurement shows BER figures).Class BER (GSM 05.08)***** ******************qua 0 (BER < 0.2%)qua 1 (BER 0.2 - 0.4%)qua 2 (BER 0.4 - 0.8%)qua 3 (BER 0.8 - 1.6%)qua 4 (BER 1.6 - 3.2%)qua 5 (BER 3.2 - 6.4%)qua 6 (BER 6.4 - 12.8%)qua 7 (BER >12.8%)The rule of thumb is that in quality classes 0-5 the MS user does not yet feelthat the quality is bad.. **********************. Background information. UL Interference. **********************  Band indicates the average interference band of TCH (idle).If there is no interference (uplink), average band should be 1.The band limits are defined in cell parameters by setting the boundaries inthe interference averaging parameter set.------------------ boundary 0 (value fixed: -110dBm)band 1------------------ boundary 1 (value eg.: -105dBm)band 2------------------ boundary 2 (value e.g.: -100dBm)band 3------------------ boundary 3 (value e.g.: -95dBm)band 4------------------ boundary 4 (value e.g.: -90dBm)band 5------------------ boundary 5 (value fixed: -47dBm). PART 1: TRX HIT LIST. ********************For each TRX reported:======================q0..7 (%) UL /ulq_2 Cumulative % of uplink call samples.. Target value example: q5 over 98 %.q0..7 (%) DL /dlq_2 Cumulative % of downlink call samples.. Target value example: q5 over 98 %.Call min /trf_32a Call time in minutes counted from samples.Call dif /trf_21a The ratio of call samples of the most loaded TRX. to that of the least loaded TRX in the same BTS.. Sorting the report by using this value may help to. detect abnormal traffic distribution in a cell.Intrf /itf_4 Average interference band (1-5, 5 being the worst)Freq Frequency of TRX. 'chgd' = frequency has been. changed during the period. Blank means. that there has been no calls.. PART 2, INTERFERENCE PROFILE. ****************************For each TRX exceeding the thresholds and having interferencea 10day/24h breakdown is shown.- Check the 10-day/24-hour breakdown charts to find out what the pattern is.- If you suspect that the interference is from the BS itself (constantband 5 interference e.g. in all sectors) you may setthe power to minimum for a while (this means that calls cannot be made!)and check from the BSC MML with ZERO command if the interference level hasgone down in idle time slots. Then put the power back to the initial level.- After you have found the cells with obvious external UL interferenceyou maya) mark the cells having a similar interference pattern on the map withthe same colour and see if the antenna directions point to a certain place- It is also a good idea to check whether the cell is not reported by report 062,which could mean interference from an own adjacent cell.b) use Undefined Adjacent Cell measurement (possibly with the idle state BAlist to define what are the strongest frequencies in the band that are notadjacent cells.  c) You may also run the report 210 to get more details about the cell.. PART 3: FREQUENCY PROFILE. *************************For all TRXs exceeding the thresholds and having frequency changed during thegiven time period a 10day/24h breakdown is shown. The value of zero means thatthere are no calls. Frequency changes must be considered when analysinginterference behaviour.Measurement used: p_nbsc_rx_qual, p_nbsc_power (mandatory)NOTE: Running this report takes a while. Patience please.NOTE: This report processed data on TRX and hourly level and can therefore. cause a very heavy load if a large BTS area is used.. USE THE SMALLEST APPLICABLE BTS AREA!NOTE: For S10 and later use report 246 or 244 to see the AMR part separately.=============================================================================================================================================================== END OF REPORT===============================================================================
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