Acronym Ericsson

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TNDROPTFNDROPTFNDROPSUBTHNDROPTHNDROPSUB

TFNCEDROP

TASSALL & TCASSALL

CMSESTABCNDROPCCONGSccongssubCNRELCONGCLUNDROPCLUDISSSCLUDISTACLUDISQATFTRALACCCELTCHF.TFNSCANTHTRALACCTHNSCAN

TFTRALSUB & THTRALSUB


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NECELLREL.HOVERSUCNLLREL.HOVERSUCNLLREL.HOVERCNTNELLREL.HOVERCNTNILASS.HOSUCBCLNILASS.HOSUCWCL

NELASS.HOSUCBCLNELASS.HOSUCWCLCCALLSCMSESTABTDWNACCTDWNSCANERCS_BSS_ITSIB1ERCS_BSS_ITSIB2ERCS_BSS_ITSIB3ERCS_BSS_ITSIB4ERCS_BSS_ITSIB5ITFUSIB1ITFUSIB2ITFUSIB3ITFUSIB4ITFUSIB5ITFOSIB1ITFOSIB2ITFOSIB3ITFOSIB4ITFOSIB5

DMASRTBFSREDGE_Throughput_TSGPRS_Throughput_TSMCS_Coding_Scheme_UtilizationTotal_Payload_MBHard_BlockingFAILDLTBFESTDLTBFESTDLBGEGDATA

ULBGEGDATA

DLBGGDATAULBGGDATA

ERCS_BSS_Total_PayloadERCS_BSS_Total_Payload_DL


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ERCS_BSS_SUMIHOSUCC

ERCS_BSS_SUMEIHOSUCCERCS_BSS_SUMIHOATTERCS_BSS_SUMEIHOATT

RAACCFACNROCNT

PDRAC

CDISSSCDISSSSUB

CDISQACDISQASUBCDISTATAVAACCTAVASCANTNUCHCNTTHV3TRALACCTFV3TRALACCTFV3NSCANTHV3NSCANERCS_BSS_TDISSBLERCS_BSS_TDISSDLERCS_BSS_TDISSULERCS_BSS_TDISQABLERCS_BSS_TDISQADLERCS_BSS_TDISQAULERCS_BSS_TDISTAERCS_BSS_TSUDLOS


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TFNDROP+TFNDROPSUB+THNDROP+THNDROPSUB rate and for overlaid subcells, for example THNDROPSUB

e o a num er o roppe u ra e connec ons n un er a su ce a occur w en asubscriber to subscriber connection has already been established. The counter is incremented whena connection is dropped after any of the three messages 44.018 ASSIGNMENT COMPLETE, 44.018HANDOVER COMPLETE, 44.018 CHANNEL MODE MODIFY ACKNOWLEDGE and before one of theDTAP messages 24.008 RELEASE or 24.008 DISCONNECT is received by the BSC.The assignment success rate covers both change from SDCCH to TCH or changed channel mode on TCH fromsignalling to speech.It should be noted that during the assignment procedure there may be several attempts to allocate a channel indifferent cells, but the attempts counter in this formula (TASSALL) will only be incremented once, if an attemptsucceeds or if all attempts have failed.A low TCH assignment success rate would normally be due to TCH congestion. The KPI shows the subscriberperceived TCH availability at call setup and is impacted by parameter settings for example for the assignmenttime-out (TASSREQ) and assignment to worse or better cell (for example AWOFFSET). The systems aredimensioned to have a certain TCH GoS, so the KPI must be compared to the TCH GoS the system was plannedfor. Please, observe that congestion at handover is not included in this KPI, or any other KPI, as there is no wayto determine the subscriber impact due to a handover that could not be executed due to congestion. As asecond level measurement the channel availability in the cells should be monitored in terms if congestion time,this is though not a KPI as it does not directly translate into a subscriber impact (with features like OL/ULsubcells, Hierarchical Cell Structures, assignment to worse cell and dynamic mode adaptation subscriber impactdue to lack of channels is prevented).

When there is VAMOS traffic using TSC from set 2, STS counters related to MS connection establishments on

SDCCH, for example CMSESTAB, will decrease, and STS counters related to MS connection establishments onThe total number of dropped SDCCH channels in a cell.Congestion counter for underlaid subcell. Stepped each time an allocation attempt fails due to SDCCH congestion.The counter for overlaid subcell is CCONGSSUB .Number of released connection on SDCCH due to TCH and transcoder congestion in underlaid and overlaid sub

The total number of dropped SDCCH channels during location area update in a cell. The counter CLUNDROP is inDropped SDCCH connection during location area update at low signal strength on down or uplink in underlaid sDropped SDCCH connection during location area update at excessive Timing Advance (TA). CLUDISTA works as CDIDropped SDCCH connection during location area update at bad quality down or uplink per cell in underlaid subcTraffic level accumulator for full-rate TCH. The corresponding counter for half-rate is THTRALACCCell tch fr-Number of accumulations of traffic level counter for full-rate TCH. The corresponding counter for half-rTraffic level accumulator for full-rate TCH. The corresponding counter for half-rate is THTRALACCNumber of accumulations of traffic level counter for full-rate TCH. The corresponding counter for half-rate is THNThe value can be calculated for the whole BSC by adding all cells together. The traffic can also be calculated forcells and subcells. In the subcell case there is a specific counter for overlaid subcell TCH traffic, THTRALSUB andTFTRALSUB (half- and full-rate respectively). The values for underlaid cell can be obtained by subtracting thevalue of the overlaid from THTRALACC or TFTRALACC respectively. A similar formula can be used for SDCCHtraffic using the counters CTRALACC and CNSCAN in the object types CLSDCCH (underlaid + overlaid) and


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Channel allocation attempt counter (on SDCCH).Successful MS channel establishments on SDCCHThe counter is stepped every tenth second if there are no TCHs in IDLE or BUSY state in the cell and the cell state iThe counter is stepped every tenth second when the cell state is ACTIVE

Accumulated number of idle TCH/F in the underlaid subcell in interference band 1. The corresponding counter for

FOR OVERLAID

The total number of attempts to establish a downlink TBF that resulted in a failure due to lack of resources. Lack oThe total number of attempts to establish a downlink TBF

Accumulated total LLC data received on the downlink in GPRS mode transfers for QoS class Background.Units: kbit


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The object types RANDOMACC, RNDACCEXT and CELLGPRS contain the counters for Random Access (RA) reasons

and performance. The number of successful and failed random accesses are registered and information aboutthe distribution of the reasons for random access is also available. A failed random access burst does notnecessarily lead to a call setup failure, as the MS sends many RA bursts each time it tries to connect to thenetwork. A high number of RA failures might be caused by bad BSIC planning or interference. Number of FailedNumber of Accepted Random Accesses. This counter is also incremented for TRXT connections.T e counter va ue is incremente w en a 44.058 CHANNEL REQUIRED containing 44.018 CHANNELREQUEST with establishment cause "One Phase Packet Access" or "Single Block Packet Access" isDropped SDCCH connection at low signal strength on down or uplink in underlaid subcell that is belowLOWSSDL and/or LOWSSUL. There is also a counter for overlaid subcell, CDISSSSUB

Dropped SDCCH connection at bad quality down or uplink per cell in underlaid subcell that is worse than

BADQDL and/or BADQUL. There is also a counter for overlaid subcell, CDISQASUB.

Dropped SDCCH connection at excessive Timing Advance (TA).Available Basic Physical Channels (BPCs) for traffic channels accumulator. Also available for overlaidNumber of accumulations of available BPCs for traffic channels counter. Also available for overlaid subcell, TAVASThe channel availability is very difficult to measure despite counters such as TAVAACC, number of available TCHs.TRALACC- TRAFFIC LEVEL ACCUMULATOR , THV3-TCH HALF RATE SPEECH VERSION 1/3TFV3-TCH Full RATE SPEECH VERSION 1/2/3 accumulations of traffic level counter. Tfv3-TCH use for Speech Version 3 FR


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Also available for overlaid subcells, CCONGSSUB.

ell. The counters are stepped when a 48.008 CLEAR COMMAND message with cause "No radio resourcremented for abnormal terminations that occur during location area update.bcell that is below LOWSSDL and/or LOWSSUL. There is also a counter for overlaid subcell, CLUDSSSUB.

ISTA, but is only incremented for drops during location area update.ell that is worse than BADQDL and/or BADQUL. There is also a counter for overlaid subcell, CLUDISQAS

te is THNSCAN

CAN


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s ACTIVE

half-rate and overlaid subcell is ITHOSIB1.Shown below is the percentage of idle channels in interferenc

f resources could mean: no PDCH allocated on which the TBF could be reserved; no TFIs available (that i


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ubcell, TAVAACCSUB .ANSUB

This is due to the fact that TNUCHCNT, number of defined TCHs, depends on whether the number is sys


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available" is received. CNDROP is stepped at the same time. The counters are not incremented if 48.0

CLUDISSS and CLUDISSSSUB works as CDISSS and CDISSSSUB respectively, but are only incremented for

B. CLUDISQA and CLUDISQASUB works as CDISQA and CDISQASUB respectively, but are only increment


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e band 1 out of the total idle channels. The same measure can be calculated for interference band 2 to

is maximum allowed number of TBF reserved on all allocated PDCH); the PDCH was preempted before it


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em defined or operator defined


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8 CLEAR REQUEST has been sent previously. The subset for overlaid subcells is CNRELCONGSUB. The tw

drops during location area update.

ed for drops during location area update.


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. As a help expression, the total number of idle full-rate TCH in underlaid subcell is calculated first.

could be reserved; some other channel fault that prevented the reservation; congestion in MAC (that i


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o counters are located in CLSDCCH and CLSDCCHO respectively.Note: There is an exception when the c


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no frame number could be returned); congestion in the CP prevented the request being processed


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unters are incremented despite that 48.008 CLEAR REQUEST is sent. Namely, when a GSM Priority Con


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nection, queued by the MS Queuing function, is removed from the queue because of time-out of the as


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ignment queuing timer (T11).


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Formulas that include handovers have considered handovers both to BSC internal and externalneighbors. If data is only collected from one BSC it is not possible to obtain the incoming

For formulas handling handovers user defined summation counter have been used. Thesummation counters are not part of the BSC STS counters, but should created on cell level in a

The STS object types that contain counters for BSC internal cell relations are NCELLREL and

NICELASS, and for BSC external cell relations NECELLREL and NECELASS.

Note:For External Cells (that is cells belonging to different BSCs, for example "BSC1" and "BSC2")the Object Type NECELLREL only shows outgoing HO (STS data from a BSC only reportcounters for that particular BSC). Hence, in order to have a proper Summation, one mustcombine the NECELLREL Ob ect T es from "BSC1" and "BSC2" res ectivel in a ost-

ATT= HOVERCNTSUCC=HOVERSUC

REV=HORTTOCHLOST=HOVERCNT-HOVERSUC-HORTTOCHABSUCC=HOSUCBCLAWSUCC=HOSUCWCLThe following summation counters are used for every cell in the BSC as the sum over alSUMOHOSUCC Sum of Successful Internal Handovers (Outgoing Handover)SUMOHOSUCC = NCELLREL.HOVERSUCSUMOABSUCC Sum of Successful Internal Assignment Handovers to Better Cell (Outgoing HandSUMOABSUCC = NICELASS.HOSUCBCLSUMOAWSUCC Sum of Successful Internal Assignment Handovers to Worse Cell (Outgoing HandSUMOAWSUCC = NICELASS.HOSUCWCL

SUMIHOSUCC Sum of Successful Internal Handovers (Incoming Handover)SUMIHOSUCC = NCELLREL.HOVERSUCSUMIABSUCC Sum of Successful Internal Assignment Handovers to Better Cell (Incoming HandoSUMIABSUCC = NICELASS.HOSUCBCLSUMIAWSUCC Sum of Successful Internal Assignment Handovers to Worse Cell (Incoming HandSUMIAWSUCC = NICELASS.HOSUCWCLSUMEIHOSUCC Sum of Successful External Handovers (Incoming Handover)SUMEIHOSUCC = NECELLREL.HOVERSUCSUMEIABSUCC Sum of Successful External Assignment Handovers to Better Cell (Incoming HandSUMEIABSUCC = NECELASS.HOSUCBCL

SUMEIAWSUCC Sum of Successful External Assignment Handovers to Worse Cell (Incoming HanSUMEIAWSUCC = NECELASS.HOSUCWCLSUMEOHOSUCC Sum of Successful External Handovers (Outgoing Handover)SUMEOHOSUCC = NECELLREL.HOVERSUCSUMEOABSUCC Sum of Successful External Assignment Handovers to Better Cell (Outgoing HanSUMEOABSUCC = NECELASS.HOSUCBCLSUMEOAWSUCC Sum of Successful External Assignment Handovers to Worse Cell (Outgoing HanSUMEOAWSUCC = NECELASS.HOSUCWCLSUMOHOATT Sum of Internal Handover Attempts (Outgoing Handover)


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SUMOHOATT = NCELLREL.HOVERCNTSUMEOHOATT Sum of External handover Attempts (Outgoing Handover)SUMEOHOATT = NECELLREL.HOVERCNTSUMOHOLOST Sum of MS Lost Internal Handovers (Outgoing Handover)SUMOHOLOST = NCELLREL.HOVERCNT - NCELLREL.HORTTOCH - NCELLREL.HOVERSUCSUMEOHOLOST Sum of MS Lost External Handovers (Outgoing Handover)

SUMEOHOLOST = NECELLREL.HOVERCNT - NECELLREL.HORTTOCH - NECELLREL.HOVERSUCFor GSM to UTRAN handovers similar summation counters are created on cell level, all countersSUMHOVERCNTUTRAN Sum of the counter HOVERCNTUTRAN over all GSM to UTRAN cell relationSUMHOVERCNTUTRAN = NUCELLREL.HOVERCNTUTRANSUMHOVERSUCUTRAN Sum of the counter HOVERSUCUTRAN over all GSM to UTRAN cell relationSUMHOVERSUCUTRAN = NUCELLREL.HOVERSUCUTRANSUMHOLOSTUTRAN Sum of HOVERCNTUTRAN - HOVERSUCUTRAN - HORTTOCHUTRAN over allSUMHOLOSTUTRAN = NUCELLREL.HOVERCNTUTRAN - NUCELLREL.HORTTOCHUTRAN - NUCELLR


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l internal or external cell relations:

ver)

ver)

er)

ver)

over)

over)

over)

dover)


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re located in the object type NUCELLREL:s (outgoing handover)

s (outgoing handover)

SM to UTRAN cell relations (outgoing handover)EL.HOVERSUCUTRAN


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Cell Availability

Formulae

Equation 1 Cell BCCH Availability (TAVAACC does step if there is available TCHs) [%]

Equation 2 Cell TCH Availability (TAVAACC does not step when TCH is not available) [%]

Description

These formulas shows the percentage of time when BCCH ( Equation 1 ) or TCH ( Equation 2 ) wa

Note:If these metrics are compared to formulas which includes TAVAACC, please remember that TA
http://localhost:9032/alexserv?AC=LINK&ID=16884&FN=212_10056-HSC10312Uen.AF.html&PA=tavaacc&ST=FULLTEXThttp://localhost:9032/alexserv?AC=LINK&ID=16884&FN=212_10056-HSC10312Uen.AF.html&PA=tavaacc&ST=FULLTEXT


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s unavailable when the cell is active.

AACC steps when BCCH is not available but there are available TCHs. If no TCH is available


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TAVAACC does not step.

Acronym Ericsson

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