radio access network statistics

23-09-2003 1/68 Pedro Cameirão

Radio Access Network Statistics

Rogers ATT Wireless

23-09-2002 Pedro Cameirão2/68

Summary

• GSM Radio Access Network Counters and Indicators• Creating Business Objects Reports• Examples of Reports


Random Access Channel Statistics

OBJECT TYPES: RANDOMACC, RNDACCEXT

Counters:

– CNROCNT: Number of accepted random accesses

– RAACCFA: Failed random access (too high TA, illegal cause values, software file congestion)

– RAANPAG: Number of Answer to paging random accesses

– RAAPAG1: Number of random accesses, Answer to paging. Channel needed = TCH/F MS capability = Dual rate

– RAAPAG2: Number of random accesses, Answer to paging. Channel needed = TCH/H or TCH/F MS capability = Dual rate

– RAAPOPS: Number of random accesses, Answer to paging or other procedures that can be completed with an SDCCH

– RAOSREQ: Number of random accesses, Other service request

– RAORSPE: Number of random accesses, Originating speech call from dual rate MS when TCH/H is sufficient

– RAORDAT: Number of random accesses, Originating data call from dual rate MS when TCH/H is sufficient



• Counters (cont.):

– RAOTHER: Number of random accesses, All other cases (i.e. Location Update, Attach, Detach)

– RAEMCAL: Number of random accesses, Emergency call

– RACALRE: Number of random accesses, Call reestablishment

– RACALR1: Number of random accesses, Call reestablishment. TCH/H was in use

– RACALR2: Number of random accesses, Call reestablishment TCH/H+TCH/H was in use



• Indicators:

– Total Number of Random Access Attemps : CNROCNT + RAACCFA

– Failed Random Access out of Total Attempts: RAACCFA/(CNROCNT + RAACCFA)

– Answer_To_Paging%: (RAANPAG+RAAPAG1+RAAPAG2+RAAPOPS)/ (RAANPAG+RAAPAG1+RAAPAG2+RAAPOPS+RAOSREQ+RAORSPE+RAORDAT+RAOTHER+RAEMCAL+RACALRE+RACALR1+RACALR2)

– Request_For_Service%: (RAOSREQ+RAORSPE+RAORDAT)/ (RAANPAG+RAAPAG1+RAAPAG2+RAAPOPS+RAOSREQ+RAORSPE+RAORDAT+RAOTHER+RAEMCAL+RACALRE+RACALR1+RACALR2)

– Other_Causes%: RAOTHER/ (RAANPAG+RAAPAG1+RAAPAG2+RAAPOPS+RAOSREQ+RAORSPE+RAORDAT+RAOTHER+RAEMCAL+RACALRE+RACALR1+RACALR2)

– Emergency_Calls%: RAEMCAL/ (RAANPAG+RAAPAG1+RAAPAG2+RAAPOPS+RAOSREQ+RAORSPE+RAORDAT+RAOTHER+RAEMCAL+RACALRE+RACALR1+RACALR2)

– Call_Reestablishments%: (RACALRE+RACALR1+RACALR2)/ (RAANPAG+RAAPAG1+RAAPAG2+RAAPOPS+RAOSREQ+RAORSPE+RAORDAT+RAOTHER+RAEMCAL+RACALRE+RACALR1+RACALR2)


SDCCH Statistics• Counters (OBJECT TYPES – CLSDCCH, CELLCONF)

– CCALLS: Allocation attempt counters (incremented at signaling connection setup, at handover and at assignment).

– CCONGS: incremented when an allocation attempt fails due to no idle channels.

– CTCONGS: When the last available channel is allocated, the counter is incremented each second until a channel becomes idle.

– CTRALACC: Traffic level accumulator.

– CNSCAN: Scaning counter. Incremented one by one at each time CTRALACC is updated.

– CNDROP: Number of abnormally terminated SDCCH connections.

– CNUCHCNT: Number of SDCCH channels defined (adaptive configuration of logical channels is not considered).

– CAVAACC: Every tenth second the number of available channels is scanned and the value is added to CAVAACC.

– CAVASSCAN: Scaning counter. Counts the number of times CAVAACC is updated.

– CMSESTAB: successful connection establishments on the SDCCH (incremented at signalling connection setup, at handover and at assignment).

– CNRELCONG: Incremented when a connection on SDCCH is released due to radio resource congestion, that is when there is congestion on TCH or congestion on transcoder resources (CNDROP is incremented at the same time).

– CONFATTC: Number of reconfiguration attempts from SDCCH to TCH.

– CONFATTT: Number of reconfiguration attempts from TCH to SDCCH.


SDCCH Statistics

• Counters (OBJECT TYPES – CELLCCHDR)

– CDISTA: dropped SDCCH connection when TA is higher than or equal to the cell parameter TALIM

– CDISSS: Steped for dropped SDCCH connections when the signal strength is less than the BSC exchange properties LOWSSUL and LOWSSDL in uplink or downlink respectively, or in both the uplink and downlink (and TA < TALIM).

– CDISQA/CDISQASUB: Steped for dropped SDCCH connections with Bad quality in downlink and/or uplink (CDISQA or CDISQASUB), that is if the radio link quality is less than the BSC exchange properties BADQUL and BADQDL in uplink or downlink respectively, or in both the uplink and downlink (TA < TALIM, SSDL>=LOWSSDL and SSUL >= LOWSSUL)


SDCCH Statistics• Indicators (only underlaid counters are considered):

– SDCCH_Drops% = 100*CNDROP/CMSESTAB

– SDCCH_RF_Losses% = 100 * (CDISSS + CDISQA + CDISTA) / CMSESTAB

– SDCCH_Quality_Drops% = 100 * CDISQA / CNDROP

– SDCCH_SS_SS_Drops% = 100 * CDISSS / CNDROP

– SDCCH_TA_Drops% = 100 * CDISTA / CNDROP

– SDCCH_Drops_Due_to_TCH_Congestion% = 100 * CNRELCONG / CNDROP

– SDCCH_Other_Drops% = 100 * (CNDROP - CNRELCONG-CDISSS – CDISQA - CDISTA) / CNDROP

– SDCCH_Drops_Without_TCH_Congestion% = 100 * (CNDROP – CNRELCONG) / CMSESTAB

– SDCCH_Traffic [Erl] = CTRALACC / CNSCAN


SDCCH Statistics• Indicators (only underlaid counters are considered):

– SDCCH_Blocks% = 100 * CCONGS / CCALLS

– SDCCH_Time_Congestion_[sec] = CTCONGS

– SDCCH_Time_Congestion% = 100 * CTCONGS / 3600 (Hour Resolution) Or 100 * CTCONGS / (24 * 3600) (Daliy Total)

– SDCCH_Success% = 100 * (1 – CCONGS / CCALLS)*(1 – CNDROP/CMSESTB)

– SDCCH_Mean_Holding_Time_[s] = 3600 * CTRALACC / (CNSCAN * CMSESTB)

– Average_Number_of_Available_SDCCHs = CAVAACC / CAVASCAN

– Average_Number_of_Available_SDCCHs% = 100 * CAVAACC / (CAVASCAN * CNUCHNT) – Note that can be higher than 100% due to the adtaptive configuration of logical channels

– Number_of_Reconfiguration_Attempts_From_TCH_to_SDCCH = CONFATTC

– Number_of_Reconfiguration_Attempts_From_SDCCH_to_TCH = CONFATTT


TCH Statistics• Counters (OBJECT TYPES – CELTCHF, CELTCHH, CLTCH)

– TxTRALAC/TxTRALSUB: Traffic level accumulators. Every tenth second the counters are incremented with the number of channels in seizured state. The underlaid subcell counter includes the results of the overlaid subcell counter.

– TxNSCAN: Incremented by one each tenth second (at the same time of the traffic level acumulators).

– TxNRELCONG/TxNRELCONGSUB: Incremented when a TCH connection used for signaling and allocated as a result of immediate assignment is released when there is congestion on transcoder resources . Underlaid and Overlaid sub-cell counters are independent.

– TNUCHNT/TNUCHSUB: Number of defined channels calculated using the number of defined BPC minus the number of configured SDCCHs. Adaptive configuration of logical channels is not taken in account. Underlaid subcell counters includes the results of the overlaid subcell counter.

– TxMSESTB/TxMSESTBSUB: Number of successfuly established connections on TCH (includes imidiate assignment, assignment and handover). Underlaid subcell counter includes the results of the overlaid subcell counter.

– TxCASSAL/TxCASSALSUB: Successful assignment attempts. This counter only considers the connections that are change from signalling mode to speech or data (no handovers are considered). Underlaid and Overlaid sub-cell counters are independent.

– TASSALL: Assignment attempt counter. Is incremente for the first attempt to change a connection from signalling to speech or data. In case of Directed Retry the counter is incremented in the target cell if the attempt was successful or in the serving cell if the attempt was insuccessful.

Note: x must be replaced with F for Full Rate Traffic Channels and H for Half Rate Traffic Channels


TCH Statistics• Counters (OBJECT TYPES – CELTCHF, CELTCHH, CLTCH,DOWNTIME)

– TxCALLS/TxCALLSSUB: Counts the number of TCH allocation attempts for signalling, data or speech. The counter is incremmented at immediate assignment, assignment and handover. The underlaid subcell counter includes the results of the overlaid subcell counter.

– TxCONGSAS/TxCONGSASSUB: Incremented each time an allocation attempt at assignment or imediate assignment fails due to no idle ressources. Note that these counters can be incremented several times for the same connection. For instance in case of congestion for TCH/F SV2 another attempt is made for TCH/F SV1 thal will also lead to congestion. Underlaid and overlaid counters are independent.

– TxCONGSHO/TxCONGHOSUB: Incremented at each time and allocation for handover fails due to non idle TCH resources. Underlaid and overlaid counters are independent.

– TxTCONGS/TxTCONSUB: Incremeted each second elapsed between the moment when the last idle TCH is allocated until a new TCH becomes idle.

– TAVAACC/TAVASUB: Every tenth second the number of available TCHs is added to TAVAACC. Underlaid subcell counter includes the results of the overlaid subcell counter.

– TAVASCAN/TAVASCANSUB: Incremented by one each tenth second (at the same time of TAVASCAN and TAVASCANSUB).

– TDWNACC: Incremented every tenth second when the cell state is active and there are no available traffic channels (ie. TCHs in idle or busy state).

– TDWNSCAN: Incremented by one every tenth second when the cell state is active



TCH Statistics• Counters (OBJECT TYPES – CLTCHDRF, CLTCHDRH, CELEVENTI)

– TxNDROP/TxNDROPSUB: Incremented for all the droped connections in a cell. Underlaid and Overlaid sub-cell counters are independent.

– TxDISSDL/TxDISSDLSUB: Incremented for all the dropped connections due to an urgency condition where the Signal Strenght Downlink <= LOWSSDL, Signal Strenght Uplink > LOWSSUL, TA < TALIM. Underlaid and Overlaid sub-cell counters are independent.

– TxDISSUL/TDISSULSUB: Incremented for all the dropped connections due to an urgency condition where the Signal Strenght Uplink <= LOWSSUL, Signal Strenght Downlink > LOWSSDL, TA < TALIM. Underlaid and Overlaid sub-cell counters are independent.

– TxDISSBL/TxDISSBLSUB: Incremented for all the dropped connections due to an urgency condition where the Signal Strenght Uplink <= LOWSSUL, Signal Strenght Downlink <= LOWSSDL, TA < TALIM. Underlaid and Overlaid sub-cell counters are independent.

– TxDISQADL/TxDISQADLSUB: Incremented for all the dropped connections due to an urgency condition where the Quality in the Downlink >= BADQDL, Quality in the Uplink < BADQUL, Signal Strenght Uplink > LOWSSUL, Signal Strenght Downlink > LOWSSDL and TA < TALIM. Underlaid and Overlaid sub-cell counters are independent.

– TxDISQAUL/TxDISQAULSUB: Incremented for all the dropped connections due to an urgency condition where the Quality in the Uplink >= BADQUL, Quality in the Downlink < BADQDL, Signal Strenght Uplink > LOWSSUL, Signal Strenght Downlink > LOWSSDL and TA < TALIM. Underlaid and Overlaid sub-cell counters are independent.

– TxDISQABL/TxDISQABLSUB: Incremented for all the dropped connections due to an urgency condition where the Quality in the Uplink >= BADQUL, Quality in the Downlink >= BADQDL, Signal Strenght Uplink > LOWSSUL, Signal Strenght Downlink > LOWSSDL and TA < TALIM. Underlaid and Overlaid sub-cell counters are independent.



TCH Statistics• Counters (OBJECT TYPES – CLTCHDRF, CLTCHDRH, CELEVENTI, CELEVENTS, NCELLREL, NECELLREL,

CELLCCHHO)

– TxSUDLOS/TxSUDLOSSUB: Incremented for all the dropped connections due to an urgency conditions non classified as Signal Streght, Quality or Timing Advance and for wich there are missing measurement results. Underlaid and Overlaid sub-cell counters are independent.

– TxDISTA/TxDISTASUB: Incremented for all the dropped connections due to an urgency condition when TA >= TALIM.

– HOINSUC: Number of successful intra-cell handovers.

– HOSUCOL: Number of successful handovers from the Underlaid to the Overlaid sub-cell.

– HOSUCOLMAXIHO: Number of successful handovers from the Underlaid to the Overlaid sub-cell when maximum number of consecutive intra-cell handovers has been exceeded (MAXIHO). HOSUCOL is not incremented when HOSUCOLMAXIHO is incremented.

– HOSUCUL: Number of successful handovers from the Overlaid to the Underlaid sub-cell.

– HOSUCULMAXIHO: Number of successful handovers from the Overlaid to the Underlaid sub-cell when maximum number of consecutive intra-cell handovers has been exceeded (MAXIHO). HOSUCUL is not incremented when HOSUCULMAXIHO is incremented.

– HOVERSUC: Number of successful inter-cell handovers.

– CCHHOSUC: Number of successful inter-cell handovers on SDCCH.



TCH Statistics – Traffic Load UL/OL Subcells• Indicators:

– TCH_Traffic_[Erl] = (TFTRALACC / TFNSCAN) + (THTRALACC / THNSCAN)

– TCH_Subcriber_Perceived_Congestion% = 100 * [CNRELCONG + (TFNRELCONG + THNRELCONG + TFNRELCONGSUB + THNRELCONGSUB)]/ TASSALL

– Average_TCH_Traffic_per_defined_TCH = [(TFTRALACC / TFNSCAN) + (THTRALACC / THNSCAN)] /TNUCHCNT

– TCH_Mean_Holding_Time_[s] = 3600* [(TFTRALACC / TFNSCAN) + (THTRALACC / THNSCAN)] /(TFMSESTB+THMSESTB) (Hour Resolution) or 24* 3600* [(TFTRALACC / TFNSCAN) + (THTRALACC / THNSCAN)] /(TFMSESTB+THMSESTB) (Day Resolution)

– TCH_Call_Mean_Holding_Time_[s] = 3600*[(TFTRALACC / TFNSCAN) + (THTRALACC / THNSCAN)]/ [(TFCASSALL + THCASSALL + TFCASSALLSUB + THCASSALLSUB)] (Hour Resolution) or 24*3600*[(TFTRALACC / TFNSCAN) + (THTRALACC / THNSCAN)]/ [(TFCASSALL + THCASSALL + TFCASSALLSUB + THCASSALLSUB)] (Daily Total)

– TCH_Assignment_Success% = 100 * (TFCASSALL + THCASSALL + TFCASSALLSUB + THCASSALLSUB) / TASSALL

– Call_Setup_Success_Rate% = 100*(1- CCONGS/CCALLS)*(1-CNDROP/CMSESTB)* (TFCASSALL + THCASSALL + TFCASSALLSUB + THCASSALLSUB) / TASSALL

Note: Half Rate counters can be removed if half rate is not used


TCH Statistics – Traffic Load UL/OL Subcells

• Indicators:

– TCH_Congestion% = 100 * [(TFCONGSAS + THCONGSAS + TFCONGSASSUB + THCONGSASSUB) + (TFCONGSHO + THCONGSHO + TFCONGSHOSUB + THCONGSHOSUB)] / (TFCALLS + THCALLS)

– TCH_Congestion_at_Assignment% = 100*(TFCONGSAS+ TFCONGSASSUB + THCONGSAS + THCONGSASSUB)/ (TFCALLS+THCALLS)

– TCH_Congestion_at_Handover% = 100 (TFCONGSHO + THCONGSHO + TFCONGSHOSUB + THCONGSHOSUB)/(TFCALLS+THCALLS)

– TCH_Time_Congestion% = 100*(TFTCONGS+TFTCONSUB+THTCONGS+ THTCONSUB)/3600 (Hour Resolution) or 100*(TFTCONGS+TFTCONSUB+THTCONGS+ THTCONSUB)/(24*3600) (Daily Total)

– TCH_Connections_Used_For_Signaling% = 100*TCHSIG/TCASSALL

– Average_Number_of_Available_TCHs = 100*TAVAACC/TAVASCAN

– Downtime% = 100 * TDWNACC / TDWNSCAN

– Downtime [hours] = TDWNACC / 360



TCH Statistics – Traffic Load UL Subcell• Indicators:

– TCH_Traffic_UL[Erl] = [(TFTRALACC / TFNSCAN) + (THTRALACC / THNSCAN)] – [(TFTRALSUB/TFNSCAN) + (THTRALSUB/THSCAN)]

– Average_TCH_Traffic_per_defined_TCH_UL = [(TFTRALACC / TFNSCAN) + (THTRALACC / THNSCAN)] – [(TFTRALSUB/TFNSCAN) + (THTRALSUB/THSCAN)] / (TNUCHCNT – TNUCHSUB)

– TCH_Mean_Holding_Time_UL[s] = 3600* [(TFTRALACC / TFNSCAN) + (THTRALACC / THNSCAN)] – [(TFTRALSUB/TFNSCAN) + (THTRALSUB/THSCAN)]/[(TFMSESTB + THMSESTB) – (TFMSESTBSUB- THMSESTBSUB)]

– TCH_Call_Mean_Holding_Time_UL[s] = 3600*[(TFTRALACC / TFNSCAN) + (THTRALACC / THNSCAN)] – [(TFTRALSUB/TFNSCAN) + (THTRALSUB/THSCAN)]/(TFCASSALL + THCASSALL)

– TCH_Congestion_UL% = 100*[(TFCONGSAS + THCONGSAS) + (TFCONGSHO + THCONGSHO)] / [(TFCALLS + THCALLS) -(TFCALLSSUB+THCALLSSUB)]

– TCH_Congestion_at_Assignment_UL% = 100*(TFCONGSAS + THCONGSAS)/ [(TFCALLS + THCALLS) -(TFCALLSSUB+THCALLSSUB)]

– TCH_Congestion_at_Handover_UL% = 100 (TFCONGSHO + THCONGSHO)/[(TFCALLS + THCALLS) -(TFCALLSSUB+THCALLSSUB)]

– TCH_Time_Congestion_UL% = 100*(TFTCONGS+THTCONGS)/3600 (Hour Resolution) or

100*(TFTCONGS+THTCONGS)/(24*3600) (Day Resolution)

– Average_Number_of_Available_TCHs_UL% = 100*[(TAVAACC/TAVASCAN) – (TAVASUB/TAVASCANSUB)]



TCH Statistics – Traffic Load OL Subcell• Indicators:

– TCH_Traffic_OL[Erl] = (TFTRALSUB/TFNSCAN) + (THTRALSUB/THSCAN)

– Average_TCH_Traffic_per_defined_TCH_OL = [(TFTRALSUB/TFNSCAN) + (THTRALSUB/THSCAN)]/ TNUCHSUB

– TCH_Mean_Holding_Time_OL[s] = 3600* [(TFTRALSUB/TFNSCAN) + (THTRALSUB/THSCAN)]/(TFMSESTBSUB- THMSESTBSUB)

– TCH_Call_Mean_Holding_Time_OL[s] = 3600[(TFTRALSUB/TFNSCAN) + (THTRALSUB/THSCAN)]/(TFCASSALLSUB + THCASSALLSUB)

– TCH_Congestion_OL% = 100 * [(TFCONGSASSUB + THCONGSASSUB) + (TFCONGSHOSUB + THCONGSHOSUB)] / (TFCALLSSUB + THCALLSSUB)

– TCH_Congestion_at_Assignment_OL% = 100*(TFCONGSASSUB + THCONGSASSUB)/ (TFCALLSSUB+THCALLSSUB)

– TCH_Congestion_at_Handover_OL% = 100 (TFCONGSHOSUB + THCONGSHOSUB)/(TFCALLSSUB+THCALLSSUB)

– TCH_Time_Congestion_OL% = 100*(TFTCONSUB + THTCONSUB)/3600 (Hour Resolution) or

100*(TFTCONSUB+ THTCONSUB)/(24*3600) (Daily Total)

– Average_Number_of_Available_TCHs_OL% = 100*TAVASUB/TAVASCANSUB



TCH Statistics – Drop TCH UL/OL Subcells• Indicators:

– Total_Number_of_TCH_Drops = TFNDROP+THNDROP+TFNDROPSUB+THNDROPSUB

– Total_Number_of_RF_TCH_Drops = (TFDISSDL + TFDISSDLSUB + THDISSDL + THDISSDLSUB) + (TFDISSUL + TFDISSULSUB + THDISSUL + THDISSULSUB) + (TFDISSBL + TFDISSBLSUB + THDISSBL + THDISSBLSUB) + (TFDISQADL + TFDISQADLSUB + THDISQADL + THDISQADLSUB) + (TFDISQAUL + TFDISQAULSUB + THDISQAUL + THDISQAULSUB) + (TFDISQABL + TFDISQABLSUB + THDISQABL + THDISQABLSUB) + (TFSUDLOS + TFSUDLOSSUB + THSUDLOS + THSUDLOSSUB) + (TFDISTA + THDISTA)

– TCH_Drops_at_BSC_Level% = 100*Total_Number_of_TCH_Drops / [(TFMSESTB + THMSESTB) – HOINSUC – (HOSUCOL+HOSUCOLMAXIHO) – (HOSUCUL+ HOSUCULMAXIHO) – (HOVERSUC-CCHHOSUC)]

– TCH_Subscriber_Perceived_Drops% = 100*Total_Number_of_TCH_Drops / [(TFMSESTB + THMSESTB) – HOINSUC – (HOSUCOL+HOSUCOLMAXIHO) – (HOSUCUL+ HOSUCULMAXIHO) – (HOVERSUC-CCHHOSUC)]

– TCH_Drops_Without_Handover% = 100*Total_Number_of_TCH_Drops / [(TFMSESTB + THMSESTB) – HOINSUC – (HOSUCOL+HOSUCOLMAXIHO) – (HOSUCUL+ HOSUCULMAXIHO)] (the successful outgoing handovers are considered as normal terminations in the serving cell)

– TCH_Subscriber_Perceived_RF_Drops% = 100*Total_Number_of_RF_TCH_Drops / [(TFMSESTB + THMSESTB) – HOINSUC – (HOSUCOL+HOSUCOLMAXIHO) – (HOSUCUL+ HOSUCULMAXIHO) – (HOVERSUC-CCHHOSUC)]

– TCH_RF_Drops_Without_Handover% = 100*Total_Number_of_RF_TCH_Drops / [(TFMSESTB + THMSESTB) – HOINSUC – (HOSUCOL+HOSUCOLMAXIHO) – (HOSUCUL+ HOSUCULMAXIHO)] (the successful outgoing handovers are considered as normal terminations in the serving cell)



TCH Statistics – Drop TCH UL/OL Subcells• Indicators (cont.):

– SS_DL_Drops% = 100* (TFDISSDL + TFDISSDLSUB + THDISSDL + THDISSDLSUB) / Total_Number_of_TCH_Drops

– SS_UL_Drops% = 100* (TFDISSUL + TFDISSULSUB + THDISSUL + THDISSULSUB) / Total_Number_of_TCH_Drops

– SS_BL_Drops% = 100* (TFDISSBL + TFDISSBLSUB + THDISSBL + THDISSBLSUB) / Total_Number_of_TCH_Drops

– QA_DL_Drops% = 100* (TFDISQADL + TFDISQADLSUB + THDISQADL + THDISQADLSUB) / Total_Number_of_TCH_Drops

– QA_UL_Drops% = 100* (TFDISQAUL + TFDISQAULSUB + THDISQAUL + THDISQAULSUB) / Total_Number_of_TCH_Drops

– QA_BL_Drops% = 100* (TFDISQABL + TFDISQABLSUB + THDISQABL + THDISQABLSUB) / Total_Number_of_TCH_Drops

– Sudden_Drops% = 100* (TFSUDLOS + TFSUDLOSSUB + THSUDLOS + THSUDLOSSUB) / Total_Number_of_TCH_Drops

– Transcoder_Congestion_TCH_Drops% =100*(TFNRELCONG + TFNRELCONGSUB + THNRELCONG + THNRELCONGSUB) / Total_Number_of_TCH_Drops

– TA_Drops%= 100*(TFDISTA + THDISTA)/ Total_Number_of_TCH_Drops

– Other_Drops% = 100*[Total_Number_of_TCH_Drops - Total_Number_of_RF_TCH_Drops – (TFNRELCONG + TFNRELCONGSUB + THNRELCONG + THNRELCONGSUB) ]/ Total_Number_of_TCH_Drops

– TCH_Drops_per_Erl = Total_Number_of_TCH_Drops / [(TFTRALACC / TFNSCAN) + (THTRALACC / THNSCAN)]



TCH Statistics – Drop TCH UL Subcell• Indicators:

– Total_Number_of_TCH_Drops_UL = TFNDROP+THNDROP

– Underlaid_TCH_Drops_Out_Total_Drops% = (TFNDROP+THNDROP) / Total_Number_of_TCH_Drops

– SS_DL_Drops_UL% = 100* (TFDISSDL + THDISSDL) / Total_Number_of_TCH_Drops_UL

– SS_UL_Drops_UL% = 100* (TFDISSUL + THDISSUL) / Total_Number_of_TCH_Drops_UL

– SS_BL_Drops_UL% = 100* (TFDISSBL + THDISSBL) / Total_Number_of_TCH_Drops_UL

– QA_DL_Drops_UL% = 100* (TFDISQADL + THDISQADL) / Total_Number_of_TCH_Drops_UL

– QA_UL_Drops_UL% = 100* (TFDISQAUL + THDISQAUL) / Total_Number_of_TCH_Drops_UL

– QA_BL_Drops_UL% = 100* (TFDISQABL + THDISQABL) / Total_Number_of_TCH_Drops_UL

– Sudden_Drops_UL% = 100* (TFSUDLOS + THSUDLOS) / Total_Number_of_TCH_Drops_UL

– Transcoder_Congestion_TCH_Drops_UL% =100*(TFNRELCONG + THNRELCONG) / Total_Number_of_TCH_Drops_UL

– Other_Drops_UL% = 100*[Total_Number_of_TCH_Drops_UL - (TFDISSDL + THDISSDL) - (TFDISSUL + THDISSUL) - (TFDISSBL + THDISSBL) - (TFDISQADL + THDISQADL) - (TFDISQAUL + THDISQAUL) - (TFDISQABL + THDISQABL) - (TFSUDLOS + THSUDLOS)]/ Total_Number_of_TCH_Drops_UL (drops due to TA are included in the other drop reasons for the underlaid subcell)

– TCH_Drops_per_Erl = Total_Number_of_TCH_Drops_UL / [(TFTRALACC / TFNSCAN) + (THTRALACC / THNSCAN)] – [(TFTRALSUB/TFNSCAN) + (THTRALSUB/THSCAN)]


TCH Statistics – Drop TCH OL Subcell• Indicators:

– Total_Number_of_TCH_Drops_OL = TFNDROPSUB+THNDROPSUB

– Overlaid_TCH_Drops_Out_Total_Drops = (TFNDROPSUB+THNDROPSUB) / Total_Number_of_TCH_Drops

– SS_DL_Drops% = 100* (TFDISSDLSUB + THDISSDLSUB) / Total_Number_of_TCH_Drops_OL

– SS_UL_Drops% = 100* (TFDISSULSUB + THDISSULSUB) / Total_Number_of_TCH_Drops_OL

– SS_BL_Drops% = 100* (TFDISSBLSUB + THDISSBLSUB) / Total_Number_of_TCH_Drops_OL

– QA_DL_Drops% = 100* (TFDISQADLSUB + THDISQADLSUB) / Total_Number_of_TCH_Drops_OL

– QA_UL_Drops% = 100* (TFDISQAULSUB + THDISQAULSUB) / Total_Number_of_TCH_Drops_OL

– QA_BL_Drops% = 100* (TFDISQABLSUB + THDISQABLSUB) / Total_Number_of_TCH_Drops_OL

– Sudden_Drops% = 100* (TFSUDLOSSUB + THSUDLOSSUB) / Total_Number_of_TCH_Drops_OL

– Transcoder_Congestion_TCH_Drops% =100*(TFNRELCONGSUB + THNRELCONGSUB) / Total_Number_of_TCH_Drops_OL

– Other_Drops% = 100*[Total_Number_of_TCH_Drops_OL – (TFDISSDLSUB + THDISSDLSUB) - (TFDISSULSUB + THDISSULSUB) - (TFDISSBLSUB + THDISSBLSUB) - (TFDISQADLSUB + THDISQADLSUB) - (TFDISQAULSUB + THDISQAULSUB) - (TFDISQABLSUB + THDISQABLSUB) - (TFSUDLOSSUB + THSUDLOSSUB)] / Total_Number_of_TCH_Drops_OL (drops due to TA are included in the other drop reasons for the underlaid subcell)

– TCH_Drops_per_Erl = Total_Number_of_TCH_Drops_UL/ [(TFTRALSUB/TFNSCAN) + (THTRALSUB/THSCAN)]


TCH Statistics – SQI• Counters (OBJECT TYPE – CELLSQI)

– TSQIGOOD/TSQIGOODSUB: Incremented for every measurement with good speech quality. Underlaid and Overlaid sub-cell counters are independent.

– TSQIACCPT/TSQIACCPTSUB: Incremented for every measurement with acceptable specch quality. Underlaid and Overlaid sub-cell counters are independent.

– TSQIBAD/TSQIBADSUB: Incremented for every measurement with bad specch quality. Underlaid and Overlaid sub-cell counters are independent.

• Indicators (Underlaid/Overlaid Subcells):

– Voice_Quality_Good% = (TSQIGOOD + TSQIGOODSUB) / [ (TSQIGOOGD + TSQIGOODSUB) + (TSQIACCPT + TSQIACCPTSUB) + (TSQIBAD + TSQIBADSUB)]

– Voice_Quality_Acceptable% = (TSQIACCPT + TSQIACCPTSUB) / [ (TSQIGOOGD + TSQIGOODSUB) + (TSQIACCPT + TSQIACCPTSUB) + (TSQIBAD + TSQIBADSUB)]

– Voice_Quality_Bad% = (TSQIBAD + TSQIBADSUB) / [ (TSQIGOOGD + TSQIGOODSUB) + (TSQIACCPT + TSQIACCPTSUB) + (TSQIBAD + TSQIBADSUB)]


TCH Statistics – SQI

• Indicators (Underlaid Subcell):

– Voice_Quality_Good% = TSQIGOOD / (TSQIGOOGD + TSQIACCPT + TSQIBAD)

– Voice_Quality_Acceptable% = TSQIACCPT / (TSQIGOOGD + TSQIACCPT + TSQIBAD)

– Voice_Quality_Bad% = TSQIBAD / (TSQIGOOGD + TSQIACCPT + TSQIBAD)

• Indicators (Overlaid Subcell):

– Voice_Quality_Good% = TSQIGOODSUB / (TSQIGOODSUB + TSQIACCPTSUB + TSQIBADSUB)

– Voice_Quality_Acceptable% = TSQIACCPTSUB / (TSQIGOODSUB + TSQIACCPTSUB + TSQIBADSUB)

– Voice_Quality_Bad% = TSQIBADSUB / (TSQIGOODSUB + TSQIACCPTSUB + TSQIBADSUB)


HO Statistics – Intra-cell• Counters (OBJECT TYPE – CELEVENTI)

– HOINDQA: Incremented for all the intra-cell handover allocation attempts due to bad quality only in the downlink.

– HOINUQA: Incremented for all the intra-cell handover allocation attempts due to bad quality only in the uplink.

– HOINBQA: Incremented for all the intra-cell handover allocation attempts due to bad quality in both links.

– HOINSUC: Successful intra-cell handovers.

• Indicators:

– Total_Number_of_Intra-cell_HO_Decisions = HOINDQA + HOINUQA + HOINBQA

– Intra-cell_HO_Decisions_out_of_Total_Number_of_TCH_Connections% = 100*(HOINDQA + HOINUQA + HOINBQA)/(TFMSESTB + THMSESTB)

– Successful_Intra-cell_HO_out_of_Total_Number_of_Intra-cell_HO_Decisions% = 100* HOINSUC / (HOINDQA + HOINUQA + HOINBQA)

– Bad_Quality_Downlink_Intra-cell_HO_Decisions% = HOINDQA / (HOINDQA + HOINUQA + HOINBQA)

– Bad_Quality_Uplink_Intra-cell_HO_Decisions% = HOINUQA / (HOINDQA + HOINUQA + HOINBQA)

– Bad_Quality_Both_Links_Intra-cell_HO_Decisions% = HOINBQA / (HOINDQA + HOINUQA + HOINBQA)


HO Statistics – Sub-cell change• Counters (OBJECT TYPE – CELEVENTS)

– HOAATOL: Incremented when a channel allocation attempt, due to handover from underlaid sub-cell, is made in an overlaid sub-cell.

– HOATTOLMAXIHO: Incremented when a channel allocation attempt, due to handover from underlaid sub-cell, is made in an overlaid sub-cell and number of consecutive intra-cell handovers has exceeded the parameter MAXIHO. HOAATOL is not incremented in this case.

– HOAATUL: Incremented when a channel allocation attempt, due to handover from overlaid sub-cell, is made in an underlaid sub-cell.

– HOATTULMAXIHO: Incremented when a channel allocation attempt, due to handover from overlaid sub-cell, is made in an underlaid sub-cell and number of consecutive intra-cell handovers has exceeded the parameter MAXIHO. HOAATUL is not incremented in this case.

– HOSUCOL: Number of successful handovers from the Underlaid to the Overlaid sub-cell.

– HOSUCOLMAXIHO: Successful handovers from an underlaid sub-cell to an overlaid sub-cell and number of consecutive intra-cell handovers has exceeded the parameter MAXIHO. HOSUCOL in not incremented in this case.

– HOSUCUL: Number of successful handovers from the Overlaid to the Underlaid sub-cell.

– HOSUCULMAXIHO: Successful handovers from an overlaid sub-cell to an underlaid sub-cell and number of consecutive intra-cell handovers has exceeded the parameter MAXIHO. HOSUCOL in not incremented in this case.


HO Statistics – Sub-cell change

• Indicators:

– Total_Number_of_HO_Decisions_from_UL_to_OL = HOAATOL + HOATTOLMAXIHO

– Total_Number_of_HO_Decisions_from_OL_to_UL = HOAATUL + HOATTULMAXIHO

– Successful_HO_from_UL_to_OL% = 100 * (HOSUCOL + HOSUCOLMAXIHO) / (HOAATOL + HOATTOLMAXIHO)

– Successful_HO_from_OL_to_UL% = 100 * (HOSUCUL + HOSUCULMAXIHO) / (HOAATUL + HOATTULMAXIHO)


HO Statistics (CLS and HCS)• Counters (OBJECT TYPE – CELEVENTH, CELLHCS):

– CLSTIME: the total time in seconds cell load sharing evaluations are performed in the cell.

– TOTCLSTIME: the total time in seconds the feature CLS is active in the cell.

– HOATTLS: Number of attempts to allocate resources on a neighboring cell due to Cell Load Sharing.

– HOSUCLS: Number of successful handovers due to Cell Load Sharing.

– LOCEVAL: Number of location evaluations performed in a cell.

– BRHILAYER: Number of location evaluations where ranking differes from basic ranking due to Hierarchical Cell Structure.


HO Statistics (CLS and HCS)

• Indicators (Cell Load Sharing – CLS):

– CLS_Time% = 100 * CLSTIME / TOTCLSTIME

– Total_Number_of_CLS_HO_Decisions = HOATTLS

– CLS_HO_Success% = 100 * HOSUCLS / HOATTLS

– Successful_CLS_Handovers_out_Total_Successful_Handovers% = 100 * HOSUCLS / HOVERSUC

• Indicators (Hierarchical Cell Structure - HCS):

– Total_Number_of_Location_Evaluations = LOCEVAL

– Number_of_Location_Evaluations_Where_Ranking_Differs_From_Basic_Ranking_due_to_HCS% = 100*BRHILAYER/LOCEVAL


HO Statistics (Cell Level) • Parameters calculated for every cell as the sum of the handover counters for all the internal and external neighboring

relations:

– SUMOHOATT: Sum of the outgoing handover attempts for all the internal neighbors.

– SUMOHOSUC: Sum of the successful outgoing handovers for all the internal neighbors.

– SUMOHOREV: Sum of all the outgoing failed handovers (MS returns to old channel) for all the internal neighbors.

– SUMOHOLOST: Sum of all the dropped connections during outgoing handover for all the internal neighbors.

– SUMEOHOATT:Sum of the outgoing handover attempts for all the external neighbors.

– SUMEOHOSUC: Sum of the successful outgoing handovers for all the external neighbors.

– SUMEOHOREV: Sum of all the outgoing failed handovers (MS returns to old channel) for all the external neighbors.

– SUMEOHOLOST: Sum of all the dropped connections during outgoing handover for all the external neighbors.


HO Statistics (Cell Level)

• Indicators (Outgoing Handovers):

– Outgoing_HO_Success% = 100*(SUMOHOSUCC + SUMEOHOSUCC) / ( SUMOHOATT + SUMEOHOATT)

– Outgoing_HO_Drops% = 100*(SUMOHOLOST + SUMEOHOLOST) / ( SUMOHOATT + SUMEOHOATT)

– Outgoing_HO_Failure% = 100*(SUMOHOREV + SUMEOHOREV) / ( SUMOHOATT + SUMEOHOATT) (MS returns to old channel)

– Outgoing_HO_Success_to_Internal_Cells% = 100*SUMOHOSUCC/SUMOHOATT

– Outgoing_HO_Drops_to_Internal_Cells% = 100*SUMOHOLOST/SUMOHOATT

– Outgoing_HO_Failure_to_Internal_Cells% = 100*SUMOHOREV/SUMOHOATT (MS returns to old channel)

– Outgoing_HO_Success_to_External_Cells% = 100*SUMEOHOSUCC/SUMEOHOATT

– Outgoing_HO_Drops_to_External_Cells% = 100*SUMEOHOLOST/SUMEOHOATT

– Outgoing_HO_Failure_to_External_Cells% = 100*SUMEOHOREV/SUMEOHOATT (MS returns to old channel)


HO Statistics (Cell Level) • Parameters calculated for every cell as the sum of the handover counters for all the internal and external neighboring

relations:

– SUMIHOATT: Sum of the incoming handover attempts for all the internal neighbors.

– SUMIHOSUC: Sum of the successful incoming handovers for all the internal neighbors.

– SUMIHOREV: Sum of all the incoming failed handovers (MS returns to old channel) for all the internal neighbors.

– SUMIHOLOST: Sum of all the dropped connections during incoming handover for all the internal neighbors.

– SUMEIHOATT:Sum of the incoming handover attempts for all the external neighbors.

– SUMEIHOSUC: Sum of the successful incoming handovers for all the external neighbors.

– SUMEIHOREV: Sum of all the incoming failed handovers (MS returns to old channel) for all the external neighbors.

– SUMEIHOLOST: Sum of all the dropped connections during incoming handover for all the external neighbors.


HO Statistics (Cell Level) • Indicators (Incoming Handovers):

– Incoming_HO_Success% = 100*(SUMIHOSUCC + SUMEIHOSUCC) / ( SUMIHOATT + SUMEIHOATT)

– Incoming_HO_Drops% = 100*(SUMIHOLOST + SUMEIHOLOST) / ( SUMIHOATT + SUMEIHOATT)

– Incoming_HO_Failure% = 100*(SUMIHOREV + SUMEIHOREV) / ( SUMIHOATT + SUMEIHOATT) (MS returns to old channel)

– Incoming_HO_Success_to_Internal_Cells% = 100*SUMIHOSUCC/SUMIHOATT

– Incoming_HO_Drops_to_Internal_Cells% = 100*SUMIHOLOST/SUMIHOATT

– Incoming_HO_Failure_to_Internal_Cells% = 100*SUMIHOREV/SUMIHOATT (MS returns to old channel)

– Incoming_HO_Success_to_External_Cells% = 100*SUMEIHOSUCC/SUMEIHOATT

– Incoming_HO_Drops_to_External_Cells% = 100*SUMEIHOLOST/SUMEIHOATT

– Incoming_HO_Failure_to_External_Cells% = 100*SUMEIHOREV/SUMEIHOATT (MS returns to old channel)


HO Statistics (Cell Level) • Counters (OBJECT TYPE – CELLCCHHO):

– CCHHOCNT: number of handover commands sent to MSs on SDCCH.

– CCHHOSUC : number of successful handovers on SDCCH.

– CCHHOTOCH : number of failed handovers on SDCCH (MS returns to the old channel).

• Indicators (Handovers on SDCCH):

– SDCCH_HO_Success% = 100* CCHHOSUC / CCHHOCNT

– SDCCH_HO_Drops% = 100* (CCHHOCNT – CCHHOSUC – CCHHOTOCH) / CCHHOCNT

– SDCCH_HO_Failure% = 100* CCHHOTOCH / CCHHOCNT (MS returns to old channel)

• Indicators (Handovers on TCH):

– TCH_HO_Success% = 100*(SUMOHOSUCC + SUMEOHOSUCC - CCHHOSUC) / ( SUMOHOATT + SUMEOHOATT - CCHHOCNT)

– TCH_HO_Drops% = 100*[SUMOHOLOST + SUMEOHOLOST- (CCHHOCNT – CCHHOSUC – CCHHOTOCH) ] / ( SUMOHOATT + SUMEOHOATT -CCHHOCNT)

– TCH_HO_Failure% = 100*(SUMOHOREV + SUMEOHOREV - CCHHOTOCH) / ( SUMOHOATT + SUMEOHOATT -CCHHOCNT) (MS returns to old channel)

– TCH_HO_Drops_out_of_Total_TCH_Drops% = 100*[SUMOHOLOST+SUMEOHOLOST-(CCHHOCNT–CCHHOSUC–CCHHOTOCH)]/ Total_Number_of_TCH_Drops


HO Statistics (CellR Level) • Counters (OBJECT TYPES – NCELLREL, NECELLREL, NECELASS, NICELASS, NECELHO, NICELHO,

NECELHOEX, NICELHOEX):

Note: All the counters in this sections are incremented independently for each neigboring cell relation.

– HOVERCNT: Number of Handover Commands sent to the MS.

– HOVERSUC: Number of successful handovers.

– HORTTOCH: Number of failed handovers (MS returns to the old channel).

– HOATTHSS: Incremented for every handover decision when the serving cell is a high signal strength cell (SS >= HYSTSEP)

– HOATTLSS: Incremented for every handover decision when the serving cell is a low signal strength cell (SS < HYSTSEP)

– HOUPQA: Incremented for every handover decision with bad quality in the uplink (with or without bad quality in the downlink).

– HOEXCTA: Incremented for every handover decision with bad quality in the downlink.

– HOASWCL: Number of handover decisions at assignment when serving cell is congested (directed retry).

– HOSUCWCL: Number of successful handovers during assignment to worst cell.

– HOSUCBCL: Number of handover decisions due to assignment to better cell.

– HOSUCBCL: Number of successful hadovers due to assignment to better cell.

– HODUPFT: Incremented in the target cell for all the connections that are moved back successfully to the source cell within 10 seconds after the handover.


HO Statistics (CellR Level) • Indicators:

– HO_Success% = 100 * HOVERSUC / HOVERCNT

– HO_Drops% = 100 * (HOVERCNT – HOVERSUC – HORTTOCH) / HOVERCNT

– HO_Failure% = 100 * HORTTOCH / HOVERCNT

– TCH_HO_Success% = 100 * (HOVERSUC – CCHHOSUC) / (HOVERCNT – CCHHOCNT)

– TCH_HO_Drops% = 100 * [HOVERCNT – HOVERSUC – HORTTOCH - (CCHHOCNT – CCHHOSUC – CCHHOTOCH) ] / (HOVERCNT – CCHHOCNT)

– TCH_HO_Failure% = 100 * (HORTTOCH – CCHHOTOCH) / (HOVERCNT – CCHHOCNT)

– TCH_HO_Drops_Out_of_Total_Number_Drops% = 100 * [HOVERCNT – HOVERSUC – HORTTOCH- (CCHHOCNT – CCHHOSUC – CCHHOTOCH) ] / (TFNDROP+THNDROP+TFNDROPSUB+THNDROPSUB)

If the counters form all the internal and external neighboring cells are agregated then:

– Sum (HOVERCNT) = SUMOHOATT + SUMEOHOATT

– Sum (HOVERSUC) = SUMOHOSUCC + SUMEOHOSUCC

– Sum (HORTTOCH) = SUMOHOREV + SUMEOHOREV

– Sum (HOVERCNT) – Sum (HOVERSUC) – Sum (HORTTOCH) = SUMIHOLOST + SUMEIHOLOST


HO Statistics (CellR Level) • Indicators (Outgoing Handovers – cont.):

– Number_of_Ericsson3_HO_Decisions = HOATTHSS + HOATTLSS + HODWNQA + HOUPLQA + HOEXCTA + HOASWCL

– Handover_Decisions_Due_to_Power_Budget% = 100 * (HOATTHSS + HOATTLSS) / Number_of_Ericsson3_HO_Decisions

– Handover_Decisions_Due_to_Bad_Quality_Downlink% = 100 * HODWNQA / Number_of_Ericsson3_HO_Decisions

– Handover_Decisions_Due_to_Bad_Quality_Uplink% = 100 * HOUPLQA / Number_of_Ericsson3_HO_Decisions

– Handover_Decisions_Due_to_TA% = 100 * HOEXCTA / Number_of_Ericsson3_HO_Decisions

– Handover_Decisions_Due_to_Congestion% = 100 * HOASWCL / Number_of_Ericsson3_HO_Decisions (Assignment to Worst Cell)

– Ping_Pong_Handovers% = 100* HODUPFT / HOVERSUC

– Successful_Assignments_to_Worst_Cell% = 100 * HOSUCWCL / HOASWCL

– Successful_Assignments_to_Better_Cell% = 100 * HOSUCBCL / HOASBCL


Idle Channel Measurement (ICM) Statistics• Counters (OBJECT TYPES – IDLEOTCHF, IDLEOTCHH):

– ITxUSIB1/ITxOSIB1: Accumulated number of traffic channels in band 1 for the underlaid and overlaid sub-cells. The underlaid and overlaid sub-cell counters are independent.





– NOACCUx/NOACCOx: Total number of accumulations for the underlaid and overlaid idle channel measurement counters. The underlaid and overlaid counters are independent.

Note: x must be replaced by F for full rate traffic channels or H for half rate traffic channels


Idle Channel Measurement (ICM) Statistics• Indicators (Underlaid/Overlaid Sub-cells):

– Total_Number_of_Measurements = NOACCUF + NOACCOF + NOACCUH + NOACCOH

– Band1% = 100 *(ITFUSIB1 + ITFOSIB1 + ITHUSIB1 + ITHOSIB1) / Total_Number_of_Measurements





• Indicators (Underlaid Sub-cell):

– Total_Number_of_Measurements_UL = NOACCUF + NOACCOH

– Band1_UL% = 100 *(ITFUSIB1 + ITHUSIB1) / Total_Number_of_Measurements_UL






Idle Channel Measurement (ICM) Statistics• Indicators (Overlaid Sub-cell):

– Total_Number_of_Measurements_OL = NOACCOF + NOACCOH

– Band1_OL% = 100 *(ITFOSIB1 + ITHOSIB1) / Total_Number_of_Measurements_OL






GPRS Statistics• Counters (OBJECT TYPES – CELLGPRS):

– PCHALLFAIL: Incremented when there are no channels available in the circuit switched domain to be allocated for dedicated or on-demand PDCHs.

– PCHALLATT: Incremented at each request to allocate dedicated or on-demand PDCHs from the circuit switched domain.

– PREEMPTPDCH: Counts the number of pre-empted PDCHs carrying packet traffic.

– ALLPDCHACTACC: Counts the number of PDCHs carrying packet traffic.

– FAILDLTBFEST: Counts the number of DL TBF establishment attempts failed due to one or several of the following reasons: Channel fault, Channel preemption, No channels available, Lack of TFIs, Lack of MS individuals, Congestion in MAC, Congestion due to CP load regulation.

– DLTBFEST: Counts both successful and unsuccessful DL TBF establishment attempts.


GPRS Statistics• Counters (OBJECT TYPES – CELLGPRS):

– PREEMPTTBF: is incremeted each time a TBF is released due to PDCH preemption.

– ALLPDCHACC: Incremeted every second with the number of number of allocated PDCHs.

– ALLPDCHSCAN: Incremented by one each time ALLPDCHACC is updated (every second).

– RBCDL: Counts both transmitted and re-transmited RLC data blocks in the downlink (using CS-2 at most)

– RETRANSDL: Number of retransmitted RLC data blocks in the downlink.

– RBCUL: Counts both transmitted and re-trasmitted RLC data blocks in the uplink.

– RETRANSUL: Estimation on the number of re-transmitted RLC data blocks in the uplink.


GPRS Statistics• Indicators:

– PDCH_Allocation_Failure% = 100 * PCHALLFAIL / PCHALLATT

– Preempted_PDCHs% = 100 * PREEMPTPDCH / ALLPDCHACTACC

– TBF_Establishment_Failure% = 100 * FAILDLTBFEST / DLTBFEST

– Preempted_TBFs% = 100 * PREEMPTTBF / (DLTBFEST – FAILDLTBFEST)

– Average_Number_of_Allocated_PDCHs = ALLPDCHACC / ALLPDCHSCAN

– Downlink_GPRS_Traffic_Erl = 0.02*RBCDL/3600 (includes retransmissions)

– Downlink_Retransmissions% = 100 * RETRANSDL / RBCDL

– Uplink_GPRS_Traffic_Erl = 0.2*RBCUL/3600 (includes retransmissions)

– Uplink_Retransmissions% = 100 * RETRANSUL / RBCUL

– Average_Number_of_Used_PDCHs = 100 * ALLPDCHACTACC / ALLPDCHSCAN

– Average_RL_Throughput_DL_[kbit/s] = 240 * ( RBCDL – RETRANSDL) / (20 * RBCDL)

– Average_RL_Throughput_UL_[kbit/s] = 240 * RBCUL / [ 20 * (RBCUL + RETRANSUL) ]


How to Create a BO Report ?

• Example - How to Create a Report with the Drop Call Rate for all the cells in one BSC?

1. In Business Objects Click the File Menu and Select “New...”

2. On the New Report Wizard Select:

• Generate a standard report• Universe• Network Inteligence (GSM)

3. On the Query Panel select all the necessary User Objects and apply the neccessary conditions:

• Necessary Objects:– BSC (Net Element BSC Level)– Cell_Normal (Net Element Cell Level)– Normal (Normal_Peak)– Resolution – Time (Date)– Counters (TNDROP, TMSESTB, HOINSUC, HOVERSUC)

• Necessary Conditions:– Resolution Equal to ‘Day’– BSC Equal to ‘TORBSC0’– Time (Date) = LastWeek


How to Create a BO Report ?

• Define the query...


How to Create a BO Report ?• Query Results...


How to Create a BO Report ?• Create a new variable...


How to Create a BO Report ?• Give the name to the new variable...


How to Create a BO Report ?• Define the formula for the Drop Call Rate...


How to Create a BO Report ?• Create Table with the Results...


How to Create a BO Report ?• Modify the Level of Detail...


How to Create a BO Report ?• Insert Chart...


How to Create a BO Report ?• Select data to Display in the Chart...


How to Create a BO Report ?• Results...


BO Reports (Worst Offenders Report)• Cell TCH Performance:

– Shows only the cells for which:• The TCH dropped call rate increased more than 2% absolute or 150% relative.• The TCH dropped call rate is greater than 1%.• The number of TCH_drops_per_Erl is greater than 0.625.

– Notes: • The Evaluation period reflects the average data for the last 7 days.• The Reference Period reflects the average data for the past month (the last 7 days are excluded).• The TCH Drops% formula in the report does not include handovers• All the filter thresholds can be changed by editing the Filter Variables (Filter_TCH_Drop_Variance, Filter_TCH_Drops and

Filter_TCH_Drops_Per_Erl).• When calculated at Network level the TCH call mean holding time is approximately 1.9 minutes (0.032 hours). This means

that on average 1 Erl of traffic translates to 31.25 calls and a 2% drop call rate is on average 0.625 drops per Erl.• The cells are sorted first by descending number of dropped calls and then by descending TCH Drops%


BO Reports (Worst Offenders Report)• Cell TCH Congestion:

– Shows only the cells for which:

• Had more than 5% subcriber perceived blocks in the past 5 days

– Notes:

• The Filter threshold can be changed by editing the Filter Variable (Filter_Subscriber_Perceived_Blocks).


BO Reports (Worst Offenders Report)• Traffic Variance:


• The average TCH Traffic in the past 5 days decreased by more than half when compared with the previous 15 days.

– Notes:

• The Filter threshold can be changed by editing the Filter Variable (Filter_Traffic_Variance).


BO Reports (Worst Offenders Report)• Cell SDCCH Performance:

– Shows only the cells for which:• Had more than 2% SDCCH drops without TCH congestion in the last 7 days.• The Call Setup Success Rate was lower than 95% for the last 7 days.

– Notes: • The Evaluation period reflects the average data for the last 7 days.• The Reference Period reflects the average data for the past month (the last 7 days are excluded).• The Filter thresholds can be changed by editing the Filter Variables (Filter_SDCCH_Drops_Without_TCH_Cong,

Filter_Call_Setup_Succ1).


BO Reports (Worst Offenders Report)• Cell SDCCH Congestion:


• Had SDCCH blocking rate greater than 2% in the past 5 days.• The Call Setup Success Rate was lower than 95% for the last 5 days

– Notes:

• The Filter thresholds can be changed by editing the Filter Variables (Filter_SD_Blocks% and Filter_Call_Setup_Success2).


BO Reports (Worst Offenders Report)• Cell Outgoing Handover Performance:

– Shows only the cells for which:• The Outgoing Handover Success Rate was lower than 95% in the past 7 days.• The Number of Outgoing Handover Drops out of the Total TCH Drops was greater than 30% in the past 7 days.• The number of Outgoing Handover Drops per Erlang of carried Traffic was greater than 0.125 (20% of the value used in the

TCH performance filter) in the past 7 days.

– Notes:

• The Filter thresholds can be changed by editing the Filter Variables (Filter_Outgoing_HO_Success, Filter_Outgoing_HO_Drops_out_Drops, Filter_Outgoing_HO_Drops_per_Erl).


BO Reports (Worst Offenders Report)• Cell Incoming Handover Performance:


• The Incoming Handover Success Rate was lower than 90% in the past 7 days.

– Notes:

• The Filter threshold can be changed by editing the Filter Variable (Filter_Incoming_HO_Success).


BO Reports (Worst Offenders Report)• Cell SQI:


• The number of samples with SQI bad was greater than 10% in the past 5 days.

– Notes:

• The Filter threshold can be changed by editing the Filter Variable (Filter_SQI_Bad).


BO Reports (Worst Offenders Report)• Cell ICM:


• The sum of ICM samples in Band3, Band4 and Band5 was greater than 15% in the past 5 days.

– Notes:

• The Filter threshold can be changed by editing the Filter Variable (Filter_ICM_Bands%).• With the current parameter settings:

-106 dBm < Band3 <= -98 dBm, -98 dBm < Band4 <= -80dBm, Band5> -80 dBm


BO Reports (Worst Offenders Report)• Cell Downtime:


• The downtime was greater than 0 in the past 5 days.

– Notes:

• The Filter threshold can be changed by editing the Filter Variable (Filter_Cell_Downtime).


BO Reports (Variance Report)

• The Variance Report presents the same data as the Worst Offernders Report

• For the sub-reports that show variances (Cell TCH Performance, Cell SDCCH Performance, Cell Outgoing Handover Performance and Cell Incoming Handover Performance):

– The Evaluation Period is the last day of data

– The Reference Period is the last month of data (excluding the last day)

• The sub-reports Cell TCH Congestion, Traffic Variance, Cell SDCCH Congestion, Cell SQI, Cell ICM and Cell Downtime reflect the same periods of data as the Worst Offenders Report


BO Reports (Cell & BSC Health Reports)

• The Cell & BSC Health Report presents the trends in chart format for all the relevant indicators of performance.

• The BSC Health Report can be used to track the performance of the network after major parameter changes.

• The Cell Health Report can be used to dig in to the problems of isolated cells

• The Cell Health Report can be used to monitor the changes on performance of a cell after hardware or parameter changes

radio access network statistics

Documents