01-07 handover

7 Handover

About This Chapter

7.1 OverviewThis topic describes handover. Controlled by the network, handover is a basic function of themobile communications system. Handover ensures the continuity of mobile services.

7.2 AvailabilityThis lists the NEs and software required for the implementation of handover.

7.3 Technical DescriptionThis describes the technical aspects of the Huawei handover algorithm. As a whole, the Huaweihandover algorithm is composed of handover preprocessing and handover decision.

7.4 ImplementationThis describes how to configure the handover and the power boost before handover.

7.5 Maintenance InformationThis lists the performance counters related to handover.

7.6 References

HUAWEI BSC6000 Base Station SubsystemBSS Feature Description 7 Handover

Issue 03 (2008-01-25) Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd

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7.1 OverviewThis topic describes handover. Controlled by the network, handover is a basic function of themobile communications system. Handover ensures the continuity of mobile services.

DefinitionHandover is a process in which a conversation can be sustained when an MS moves from onecell to another in order to meet the requirement of network management.

PurposesAs a method of radio link control, handover enables an MS to keep an conversation sustainablewhen the MS travels across different cells. In addition, handover can optimize the overallperformance of the system through the adjustment of traffic volume by means of parameters.

TermsTerms Definition

Ping-ponghandover

Ping-pong handover occurs when an MS is switched back and forth betweentwo cells due to the changes in signal quality or the improper settings of theparameters.

Co-siteneighborcells

Neighbor cells under the same BTS.

Raileighfading

In radio propagation, signals inevitably suffer from short-period amplitudechanges. Raileigh fading relates to frequency. In other words, signal fading isfrequency-specific.

ChainNeighborCell

Chain Neighbor Cell is a parameter of the neighbor cell relation property. Duringthe fast movement handover, the MS can be handed over to only the neighborcells of the serving cell. In addition, the neighbor cells and the serving cell mustbe configured in chain mode. Generally, the two neighbor cells in the directionof the fast movement of the MS are configured as chain neighbor cells. Theconfigurations depend on the actual conditions.

DTCBhandover

DTCB handover is a special method of determining the boundary between anoverlaid subcell and an underlaid subcell for the enhanced dual-band network.The coverage area of the overlaid subcell is determined through the DTCBthreshold, the DTCB hysteresis, and the difference between the signal strengthof the serving cell and that of the neighbor cell.

7 HandoverHUAWEI BSC6000 Base Station Subsystem

BSS Feature Description

7-2 Huawei Proprietary and ConfidentialCopyright © Huawei Technologies Co., Ltd

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Terms Definition

Frequencyoffset

When the transmit source of the radio wave is far from the receive party, thewavelength is long and the frequency is low. When the transmit source is closeto the receive party, the wavelength is short and the frequency is high. The BTScarrying the serving cell can calculate the frequency offset (indicated by Δf)through the signals trasmitted by the moving MS. If the absolute value of Δf isgreat, you can infer that the MS is moving fast. If Δf is a positive number, youcan infer that the MS is moving toward the BTS. If Δf is a negative number, youcan infer that the MS is moving away from the BTS.

Acronyms and AbbreviationsAcronymsandAbbreviations Full Spelling

MS Mobile Station

BSC Base Station Controller

MR Measure report

BQ Bad Quality

TA Timing Advance

BSIC Base Station Identity Code

BCCH Broadcast Control CHannel

AMR Adaptive Multi Rate

RQI Radio Quality Indication

7.2 AvailabilityThis lists the NEs and software required for the implementation of handover.

Network Elements InvolvedTable 7-1 lists the network elements involved in handover.

Table 7-1 NEs involved in handover

MS BTS BSC MSC MGW SGSN GGSN HLR

√ √ √ √ – – – –



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MS BTS BSC MSC MGW SGSN GGSN HLR

NOTE

l –: not involved

l √: involved

Software Releases

Table 7-2 describes the software versions of GBSS products that support handover.

Table 7-2 GBSS products and related versions

Product Version

BSC BSC6000 V900R003C01 and laterreleases

BTS BTS3X All releases

BTS2X All releases

Double-transceiver BTS All releases

Miscellaneous

None.

7.3 Technical DescriptionThis describes the technical aspects of the Huawei handover algorithm. As a whole, the Huaweihandover algorithm is composed of handover preprocessing and handover decision.

Handover Preprocessing

Handover preprocessing consists of the following contents:

l Handover preparation

l Handover penalty

l Neighbor cell sorting

l Network characteristic adjustment

l Forced handover processing

l Power boost before handover

Handover Decision

Handover decision is categorized into the following types.




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l Fast movement handover (consisting of fast PBGT handover and frequency offsethandover): Good services can be provided when the speech quality deteriorates during thefast movement of an MS.

l Emergency handover: A call can be kept sustainable when the radio environment severelydeteriorates.

l Load handover: The load of the system traffic can be shared so that the deterioration oflocal counters is minimized.

l General handover: Good services can be provided when an MS is moving.

7.3.1 Handover PreprocessingThis describes the handover preprocessing. Based on the neighbor cell information andconfigured parameters in the measurement report, the system performs handover preprocessingand adjusts the priority of a neighbor cell.

7.3.2 Handover Decision AlgorithmThis describes the handover decision algorithm. After measurement reports are preprocessed,the handover decision procedure starts. According to the emergency condition of an MS on thenetwork and the handover decision algorithm, the BSC performs handover decision in thefollowing order: fast movement handover, emergency handover, load handover, and then generalhandover.

7.3.1 Handover PreprocessingThis describes the handover preprocessing. Based on the neighbor cell information andconfigured parameters in the measurement report, the system performs handover preprocessingand adjusts the priority of a neighbor cell.

Handover Preparation

Neighbor cell information is decoded from the measurement report.

According to the BCCH frequencies and cell BSIC reported by an MS, the correspondingneighbor cell index is detected. Then the uplink part and downlink part of the measurementreport is read.

l If measurement reports are issued continuously, they are directly interposed in themeasurement report queue.

l If measurement reports are issued discontinuously and the number of lost measurementreports is smaller than the allowed number, measurement reports are interpolated beforebeing interposed in the measurement report queue.

l If measurement reports are issued discontinuously and the number of lost measurementreports is greater than the allowed number, the previous measurement reports are discarded.When new measurement reports arrive, calculation is performed again.

Filtering treatment is performed on measurement reports. Then a number of consecutivemeasurement reports are obtained from the queue. The number depends on the dataconfiguration. Averaging treatment is performed on uplink/downlink RX level, uplink/downlinkRX quality, timing advance, neighbor cell level, and BTS power. The averaging treatmentminimizes the effect of abrupt changes in individual measurement report values on the result ofhandover decision.

If consecutive measurement reports are insufficient, you can infer that filtering fails. Thenhandover decision is not performed.



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Fast Movement Handover PreparationThe fast movement handover preparation consists of the following:

l Frequency offset information is decoded from the measurement report.The BSC reads the frequency offset information on the MS from the measurement reportdelivered by the BTS.

l The α filtering treatment is performed on the measurement report.

Handover PenaltyThe handover penalty is performed in the following cases: success of the fast movementhandover, success of the TA emergency handover, success of the BQ emergency handover,success of the fast movement handover from a micro cell to a macro cell, success of the enhancedconcentric cell handover from an overlaid subcell to an underlaid subcell, and failure of theenhanced concentric cell handover from an overlaid subcell to an underlaid subcell.

l After the fast movement handover, TA emergency handover, or BQ emergency handoveris successful, penalty is performed on the originating cell during the penalty period.

l After the fast movement handover from a micro cell to a macro cell is successful, penaltyis performed on all the neighbor micro cells.

l After the enhanced concentric cell handover from an overlaid subcell to an underlaid subcellis successful, calls cannot be handed over from the underlaid subcell to the overlaid subcell.

l After the handover fails, penalty is performed on the target cell during the penalty period.

The penalty time and penalty level of the previous handovers can be configured.

Neighbor Cell SortingThe serving cell and all the neighbor cells are sorted according to the level. Then, a list ofcandidate cells is obtained on the basis of level.

l Determine whether the downlink RX level of a neighbor cell is greater than the minimumRX level. At the same time, the uplink/downlink balancing offset is taken intoconsideration. Only the cell whose level is greater than the minimum RX level can beenlisted in the list of candidate cells. In other words, only the cell that meets the followingformula (RxLev > MS RxMIN + MAX (0,Pa)) can be enlisted in the list of candidate cells.Where, Pa = MS TXPWR MAX – P.– RxLev indicates the downlink RX level of the cell.

– MS Rx MIN indicates the minimum downlink RX level that is required for the cell.

– MS TXPWR MAX indicates the maximum MS TX power allowed by the BSS.

– P indicates the maximum TX power of an MS.

l Calculate the difference between the downlink RX level of the neighbor cells and thedownlink RX level of the serving cell. Based on the difference, sort the neighbor cells indescending order.

Network Characteristic AdjustmentNetwork characteristic adjustment is a process in which the position of each cell is determinedin the queue of candidate cells based on the related network information. Network characteristicadjustment provides the final list of candidate cells for handover decision.




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After the network characteristic adjustment, the candidate cells (consisting of neighbor cells andserving cell) are sorted in ascending order by priority. Then the handover decision procedurestarts.

Power Boost Before HandoverIn some scenarios, for example, the user is in a corner, the level may drop fast. In this case,trigger is probably triggered. According to the power control algorithm, however, the power ofthe MS and BTS may not be adjusted in time. Thus, the MS cannot receive the handovercommand and call drops occur.

Before the handover command is sent to the MS, the transmit power of the BTS is adjusted tothe maximum. In addition, the BTS power control function is disabled during the handover. Inother words, if the transmit power of the BTS is set to the maximum value during the handover,the possibility of handover success is maximized.

The power boost before handover is controlled through the setting of the Handover PowerBoost Switch parameter.

7.3.2 Handover Decision AlgorithmThis describes the handover decision algorithm. After measurement reports are preprocessed,the handover decision procedure starts. According to the emergency condition of an MS on thenetwork and the handover decision algorithm, the BSC performs handover decision in thefollowing order: fast movement handover, emergency handover, load handover, and then generalhandover.

7.3.2.1 Fast Movement HandoverThis describes fast movement handover. The handover aims to increase the handover successrate of an MS moving at a high speed and to ensure the call continuity and low call drop rate.

7.3.2.2 TA HandoverThis describes TA handover, which is a kind of emergency handover. TA handover decision isperformed according to the TA value reported by an MS.

7.3.2.3 BQ HandoverThis describes BQ handover, which is a kind of emergency handover. BQ handover decision isperformed according to the uplink/downlink RX quality on the Um interface.

7.3.2.4 Rapid Level Drop HandoverThis describes rapid level drop handover, which is a kind of emergency handover.

7.3.2.5 Interference HandoverThis describes interference handover, which is a kind of emergency handover.

7.3.2.6 No Downlink Measurement Report HandoverThis describes no downlink measurement report handover. The handover is generally caused bypoor radio environment on the uplink. In this case, the requirements of the filtering algorithmcannot be met, so other handover algorithms cannot be triggered. Then no downlinkmeasurement report handover performs handover decision based on the uplink quality to keepa call sustainable and to minimize the possibility of call drops.

7.3.2.7 Enhanced Dual-Band Network HandoverThis describes enhance dual-band network handover, which is a handover decision based on thetraffic volume of the overlaid and underlaid subcells and on the level quality.

7.3.2.8 Load Handover



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This describes load handover. On the network, some cells have heavy loads, but the overlappedupper-layer cells and the neighbor cells have light loads. To balance the loads of these cells, loadhandover is required.

7.3.2.9 Edge HandoverThis describes edge handover. Based on level, edge handover is a kind of general handover.

7.3.2.10 Fast Movement Handover from a Micro Cell to a Macro CellThis describes the fast movement handover from a micro cell to a macro cell. The fast movementhandover is performed according to the relative speed of an MS so that the number of handoverscan be minimized.

7.3.2.11 Inter-Layer (Better Cell) HandoverThis describes inter-layer (better cell) handover. To balance the traffic volume flexibly and tomeet the requirements of different topology modes, the GSM network is divided into severallayers. If inter-layer handover is used, the cells with lower layer level and lower hierarchy levelare possibly enabled to absorb traffic. If the layer level or hierarchy level is low, the value ofthe layer level or hierarchy level is great.

7.3.2.12 PBGT HandoverThis describes power budget (PBGT) handover, which is based on path loss.

7.3.2.13 Other HandoversThis describes other handovers, which consist of AMR handover and better 3G cell handover.

Fast Movement HandoverThis describes fast movement handover. The handover aims to increase the handover successrate of an MS moving at a high speed and to ensure the call continuity and low call drop rate.

Fast movement handover consists of frequency offset handover and fast PBGT handover.

l Frequency offset handoverAccording to the frequency offset information reported by an MS moving at a high speed,whether the MS is far from the serving cell is determined. Frequency offset handoverdecision is performed according to the uplink/downlink level of the serving cell and thepath loss of the neighbor cell.

l Fast PBGT handoverFast PBGT handover decision is performed according to the path loss of the neighbor cell.

For fast movement handover, the handover response speed is enhanced through the followingways:

l Accurately calculating the moving speed of the MS

l Derestricting the interval between handover precisions

l Reducing the number of measurement reports for the handover decision

l Introducing the α filtering

Fast movement handover applies to the urban backbone roads, selected routes, and high-speedrailroads.

Triggering ConditionsWhether the conditions of frequency offset handover are met is determined during handoverdecision. When the BTS cannot report the frequency offset information or the reported frequency




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offset information is invalid, fast PBGT handover is triggered if the other conditions of frequencyoffset handover are met.

The triggering conditions of fast movement handover are as follows:

l The MS is far from the serving cell (the frequency offset in the measurement result messageis a negative value) and the moving speed of the MS is higher than Quick Move SpeedThres.

l The uplink level of the serving cell after filtering is lower than Quick Handover UpTrigger Level.

l The downlink level of the serving cell after compensation is lower than Quick HandoverDown Trigger Level.

l The path loss of the configured chain neighbor cell is smaller than a certain threshold ofthe path loss of the serving cell. In other words, PBGT(n) is equal to or greater than 0.

The triggering decisions of fast movement handover are as follows:

l If the last three conditions are met, the decision is performed as follows:– If the first condition is met, a frequency offset handover is performed.

– If the first condition is not met, a fast PBGT handover is performed.

l If not all the last three conditions are met, fast movement handover is not triggered.

Target Cell SelectionThe target cell must be a chain neighbor cell of the serving cell. The target cell can be obtainedthrough the setting of Chain Neighbor Cell.

LimitationsThe limitations on fast movement handover are as follows:

l The target cell cannot serve as the serving cell.

l The candidate cells for fast movement handover must be chain neighbor cells of the servingcell. Each cell can be configured with a maximum of three chain neighbor cells.

l After fast movement handover is successful, penalty is performed on the originating cellduring the penalty time to prevent an immediate switchback to the cell. The penalty timeand penalty value depend on Quick Handover Punish Time and Quick Handover PunishValue respectively.

TA HandoverThis describes TA handover, which is a kind of emergency handover. TA handover decision isperformed according to the TA value reported by an MS.

The TA value of an ordinary cell ranges from 0 to 63. The TA value of the underlaid subcell ina double-timeslot cell ranges from 0 to 229. The step of each bit is 553.5 m. If the TA value isset to 63, you can infer that the distance is 35 km.

Triggering ConditionThe triggering condition of TA handover is as follows: TA value reported by the MS throughmeasurement reports > TA Threshold. Where, the TA value is obtained after filtering treatmentand the length of the filter is controlled through parameters.



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Target Cell Selection

A target cell should be a cell with the highest priority among the sorted candidate cells. Inaddition, the target cell should meet the following limitations.

Limitations

The limitations on TA handover are as follows:

l The target cell cannot serve as the serving cell.

l If the TA Threshold of a co-site neighbor cell < the TA Threshold of the serving cell, ahandover to the cell is forbidden.

l After the TA handover is successful, penalty is performed on the originating cell. Duringthe penalty, the penalty level is subtracted from the level of the originating cell to preventan immediate handover back to the originating cell. The penalty time and penalty level areconfigured through parameters.

From the perspective of the triggering condition for TA handover, TA can be regarded as acriterion for limiting the size of a cell.

BQ Handover

This describes BQ handover, which is a kind of emergency handover. BQ handover decision isperformed according to the uplink/downlink RX quality on the Um interface.

The RX quality is measured in bit error ratio (BER). The BSC measures the quality of a radiolink based on the quality class in the measurement report. The probable reason for an increasein BER is that the signal power is too low or the channel interference becomes great.

Triggering Condition

BQ handover is triggered if either of the following conditions are met:

l The uplink RX quality is equal to or greater than the uplink RX quality threshold of theserving cell, where the uplink RX quality is obtained after filtering treatment and the lengthof the filter is controlled through parameters.

l The downlink RX quality is equal to or greater than the downlink RX quality threshold ofthe serving cell, where the downlink RX quality is obtained after filtering treatment andthe length of the filter is controlled through parameters. Ensure that the MS can sustainappropriate communication quality.


A target cell should be the cell with the highest priority among the queue of sorted candidatecells after the preprocessing procedure. In addition, the target cell should meet the followinglimitations.

Limitations

The limitations on BQ handover are as follows:




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l If neighbor cells are available, the MS is handed over to the neighbor cell with the highestpriority. If neighbor cells are unavailable, the MS is handed over to a serving cell. Theserving cell of a different TRX is preferred.

l After BQ handover is successful, penalty is performed on the originating cell. During thepenalty, the penalty level is subtracted from the level of the originating cell to prevent animmediate handover back to the originating cell. The penalty time and penalty level areconfigured through parameters.

Rapid Level Drop Handover

This describes rapid level drop handover, which is a kind of emergency handover.

If the mean value filtering and P/N decision methods are used in edge handover and PBGThandover, responses to short-period rapid level drop are insensitive. Therefore, targeting therapid level drop, you can perform finite impact response (FIR) filtering on the original RX levelsignals. This filtering method is responsive to the rapid level drop based on the drop slope ofthe original RX level signals.


Among the sorted candidate cells after the preprocessing procedures, the target cell has thehighest priority.

Limitations

The limitations on rapid level drop handover are as follows:

l The target cell has a higher priority than the serving cell.

l The MS cannot be handed over to the serving cell.

Interference Handover

This describes interference handover, which is a kind of emergency handover.

When the RX level of the serving cell is good, the network initiates interference handover forthe MS to maintain proper communication quality if the RX quality deteriorates. The differencebetween interference handover and BQ handover is that the deterioration of RX quality ininterference handover does not affect conversations and that the RX level is good.

If interference handover is triggered, the quality of the channel that is seized by the serving cellis slightly affected. Conversations, however, can be maintained. At the same time, the RX levelof the serving cell is good and other channels in the serving cell may be affected slightly.Therefore, performing intra-cell handover can be considered.

Triggering Conditions

Uplink RX quality after filtering treatment ≥ Uplink RX quality threshold of the serving cell,and Uplink RX level after filtering treatment ≥ Uplink RX level threshold of the serving cell

Downlink RX quality after filtering treatment ≥ Downlink RX quality threshold of the servingcell, and Downlink RX level after filtering treatment ≥ Downlink RX level threshold of theserving cell



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The quality threshold (Qual_Thr) and level threshold (Lev_Thr) determine whether interferencehandover is triggered. If RxLev > Lev_Thr and RxQual > Qual_Thr, interference handover istriggered. Figure 7-1 shows the interference handover.

Figure 7-1 Interference handover

0 Rx_LevLev_Thr

Qual_Thr

Rx_Qual(dtqu)

NOTE

The blue rectangle highlighted in oblique lines shown in Figure 7-1 indicates the area where interferencehandover is triggered.


A target cell should have the highest priority among the candidate cells. In addition, a target cellshould meet the following conditions:

l When the serving cell is beyond the intra-cell handover penalty, it can serve as a target cell.

l If the filtered level of a neighbor cell is greater than the Inter-layer HO Threshold of theneighbor cell, the neighbor cell can serve as a target cell.

No Downlink Measurement Report Handover

This describes no downlink measurement report handover. The handover is generally caused bypoor radio environment on the uplink. In this case, the requirements of the filtering algorithmcannot be met, so other handover algorithms cannot be triggered. Then no downlinkmeasurement report handover performs handover decision based on the uplink quality to keepa call sustainable and to minimize the possibility of call drops.

Triggering Conditions

The triggering conditions of no downlink measurement report handover are as follows:

l The measurement report of the call once had downlink part.

l The measurement report of the call does not have downlink part currently.

l The value of the uplink quality after filtering treatment is smaller than the uplink qualitythreshold of no downlink measurement report handover.




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l The number of successive measurement reports without downlink part is smaller than thethreshold of the allowed no downlink measurement reports.

Target Cell Selectionl The sorted neighbor cells recorded in the last complete measurement report are saves as

candidate cells.l The MS is preferably handed over to a neighbor cell.

l If there is no neighbor cell, the MS is handed over to the serving cell.

LimitationsThe limitations on no downlink measurement report handover are as follows:

l The measurement report of the call once had downlink part.

l The number of successive measurement reports without downlink part does not exceed thelimitation.

Enhanced Dual-Band Network HandoverThis describes enhance dual-band network handover, which is a handover decision based on thetraffic volume of the overlaid and underlaid subcells and on the level quality.

Enhanced dual-band network handover is classified into the following:

l Handover due to high underlaid subcell load

l Handover due to low underlaid subcell load

l Call movement handover in the overlaid subcell

Triggering ConditionsThe triggering conditions of the handover due to high underlaid subcell load are as follows:

l The load of the underlaid subcell in the cell is higher than En Iuo Out Cell GeneralOverLoad Thred.

l The load of the overlaid subcell in the cell is lower than En Iuo Out Cell Serious OverLoadThred.

l The system flow is not higher than Allow Inn Out Cell HO System Flow Level.

l The current call is within the handover margin that allows handover.

The triggering conditions of the handover due to low underlaid subcell load are as follows:

l The load of the underlaid subcell in the cell is lower than En Iuo Out Cell Low LoadThred.

l The system flow is not higher than Allow Inn Out Cell HO System Flow Level.

l The current call is within the handover margin that allows handover.

The triggering conditions of the call movement handover in the overlaid subcell are as follows:

NOTE

The call movement handover in the overlaid subcell is triggered if either of the following conditions is met.



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l SS(u) < Thdouter

l SS(u) – SS(n) < DTCB_THRD – DTCB_HYST– Thdouter: indicates HO Out Inn Cell Rexlev Thred.

– SS(u): indicates the downlink level (power compensation is performed on the downlinklevel based on measurement) of the underlaid subcell where the call is originated. If theSS(u) value cannot be obtained, you can infer that the decision of enhanced dual-bandnetwork handover is not performed and the decision condition is met by default.

– SS(n): The optimum neighbor cell is a cell, the measured value of whose BCCH levelis the greatest, among the neighbor cells. The optimum neighbor cell is on the samefrequency band, layer, and level with the underlaid subcell. The cell, however, is notco-sited with the underlaid subcell. SS(n) is the value of such a cell. If such a cell isunavailable, the value of SS(n) is –110 dBm.

– DTCB_THRD: indicates the distance between the boundary of the overlaid subcell andthat of the underlaid subcell. DTCB_THRD is a relative threshold. DTCB_THRDindicates the size of the blank zone between the overlaid subcell and the underlaidsubcell. If the value of DTCB_THRD is great, the black zone between is large.

– DTCB_HYST: indicates the boundary protection hysteresis of the overlaid andunderlaid subcells to prevent ping-pong handover.

NOTE

l For the DTCB handover algorithm, the boundaries of the overlaid and underlaid subcells are determinedaccording to the relative value between the signal strength of serving cell and that of the neighbor cell.When SS(s) = SS(n), the system considers that it is the boundary point of the underlaid subcell. WhenSS(s) - SS(n) > DTCB_THRD, it is the coverage area of the overlaid subcell. The coverage area of theoverlaid subcell is determined according to the different networking and coverage conditions of theexisting network. In addition, the overlaid subcell of the serving cell and the overlaid of the neighborcell will never overlap no matter how the distance between the BTSs changes.

l The handover zone indicates the level range. In the case of overlaid/underlaid load handover on theenhanced dual-band network, the handover is performed level by level and the MS whose downlinklevel is within the handover zone is handed over.


The target cell selection has the following restrictions:

l For the handover due to high underlaid subcell load, the MS can be handed over to onlythe overlaid subcell.

l For the handover due to low underlaid subcell load, the MS can be handed over to only theunderlaid subcell.

l For the call movement handover in the overlaid subcell, the MS is handed over to theneighbor cell that ranks first among the neighbor cells. The MS cannot be handed over tothe cell that ranks behind the serving cell. The target cell is generally the underlaid subcell.It can also be other neighbor cells.

Limitations

The limitations on the handover due to high underlaid subcell load are as follows:

l The cell where the call is located is on the enhanced dual-band network. TheHW_Concentric Attribute is set to Underlay cell.

l The Out Cell Load HO To Inn Cell Enable parameter is set.




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l The maximum range of the handover zone is (63-HO Into Inn Cell Rexlev Thred). Thehandover starts from the high level.

The limitations on the handover due to low underlaid subcell load are as follows:

l The cell where the call is located is on the enhanced dual-band network. TheHW_Concentric Attribute is set to Overlay cell.

l The Inn Cell Load HO To Out Cell Enable parameter is set.

l The maximum range of the handover zone is (63-HO Out Inn Cell Rexlev Thred). Thehandover starts from the low level.

The limitations on call movement handover in the overlaid subcell are as follows:

l The cell where the call is located is on the enhanced dual-band network. TheHW_Concentric Attribute is set to Overlay cell.

Effect of the Enhanced Dual-Band Network Handover on the Existing AlgorithmThe effect of the enhanced dual-band network handover on the existing algorithm is as follows:

l On the enhanced dual-band network, to prevent the common load handover from collidingwith the handover between OL subcell and UL subcell on the network, for the commonload handover of the cells on the network, the MS cannot be handed over to the cell in thesame group when the load handover switch between the overlaid subcell and the underlaidsubcell on the network is enabled.

l Because the PBGT handover algorithm may cause inter-cell handover, the MS cannot behanded over the cell in the same group in the case of PBGT handover between the cells onthe enhanced dual-band network.

Load HandoverThis describes load handover. On the network, some cells have heavy loads, but the overlappedupper-layer cells and the neighbor cells have light loads. To balance the loads of these cells, loadhandover is required.

In a load handover procedure, some loads in heavy-load cells are handed over to light-load cells.In addition, the loads in neighbor cells should not be handed over to heavy-load cells.

Load handover can be performed in cells at different layers. Load sharing, however, can beperformed in only one BSC. Figure 7-2 shows the load handover.

Figure 7-2 Load handover

A cell witha heavy load



A cell witha light load






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To perform load sharing, increase the edge handover threshold so that the traffic on the edge ofa cell is handed over to a neighbor cell with light load.

The traffic load of a cell can be determined through the ratio of the traffic flow (generally TCHusage) of the cell to the preset threshold. If the traffic flow of a cell is greater than the Load HOThreshold, you can infer that the traffic load of this cell is heavy. The load handover algorithmneeds to be enabled. If the traffic flow of a cell is smaller than the Load Req. on CandidateCell, you can infer that the traffic load of this cell is light and the cell can receive loads from theheavy-load cells.

Load handover may trigger many handovers, so you should consider the load of the system CPUbefore triggering load handover. In other words, you should consider the system traffic levelbefore triggering load handover. In addition, to prevent too many MSs from being handed overat a time, load handover is performed step by step. In other words, the edge handover thresholdincreases based on CLS_Ramp and CLS_Period. The increase stops until the increased volumeequals CLS_Offset, as shown in Figure 7-3.

Figure 7-3 Load handover

CONF_HO_RXLEV

CONF_HO_RXLEV+CLS_Ramp

CONF_HO_RXLEV+CLS_Offset

Cell A Cell B

Border of normal handoverLoad handover band

Triggering ConditionsThe triggering conditions of load handover are as follows:

l The signaling traffic of the system is smaller than the System Flux Threshold for LoadHO.

l The load of the cell where the to-be-handed-over MS is located is greater than the LoadHO Threshold.

l The load of the cell that receives the handover is smaller than the Load Req. on CandidateCell so that ping-pong handover can be avoided.

Choice of a Target Celll RX level > Inter-layer HO Threshold + Inter-layer HO Hysteresisl The target cell is ranked ahead but it cannot be ranked ahead of the serving cell.

The system assigns MSs to different load handover bands based on the downlink RX level. Theload handover algorithm performs handover on the cell so that the MS is handed over out of thecell step by step.

For example, the MSs in load handover band 1 are handed over to the neighbor cells first. Afterthe period of one load handover step, the MSs in load handover band 2 are handed over to the




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neighbor cells until the traffic flow of the cell is equal to or smaller than the cell load handoverthreshold. Load handover band 1 refers to the area where the downlink level ranges from EdgeHO DL RX_LEV Threshold to Edge HO DL RX_LEV Threshold + step level. Loadhandover band 2 refers to the area where the downlink level ranges from Edge HO DL RX_LEVThreshold to Edge HO DL RX_LEV Threshold + (2 x step level).

Load handover uses the step-by-step outgoing handover mode so that the possibility of a sharpincrease in CPU load is eliminated and the occurrence of call drops due to congested target cellis avoided. The handover procedure can be controlled through parameters.

Edge HandoverThis describes edge handover. Based on level, edge handover is a kind of general handover.

If edge handover is triggered, the level of the target cell should be at least one hysteresis value(Inter-cell HO Hysteresis) higher than the level of the serving cell.

Triggering ConditionsIf the downlink RX level of the serving cell after filtering treatment is smaller than the EdgeHO DL RX_LEV Threshold for P seconds within successive N seconds (P/N criterion), edgehandover is triggered. Figure 7-4 shows the edge handover.

Figure 7-4 Edge handover

Cell 2Cell 1

-97 dBm -85 dBm

Choice of a Target CellThe serving cell cannot serve as the target cell.

Among the sorted candidate cells after the preprocessing procedures, the target cell has thehighest priority.

LimitationsThe limitations on edge handover are as follows:

l The MS cannot be handed over to the serving cell.

l After the sorting, the target cell must have a higher priority than the serving cell.

Fast Movement Handover from a Micro Cell to a Macro CellThis describes the fast movement handover from a micro cell to a macro cell. The fast movementhandover is performed according to the relative speed of an MS so that the number of handoverscan be minimized.



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The fast movement handover from a micro cell to a macro cell applies to the following scenarios:

l In comparison with a micro cell, an MS in the cell moves fast. Then, the MS is handed overto a macro cell.

l To prevent a fast-moving MS in a macro cell from entering a micro cell, time penalty isperformed on the micro cell so that the MS camps on the macro cell.

Figure 7-5 shows the fast movement handover from a micro cell to a macro cell.

Figure 7-5 Fast movement handover from a micro cell to a macro cell

Umbrella cell

Micro cell

Triggering Condition

Within the observation period (T) of fast movement, an MS travels across Q cells out of P cellsthrough handover. Where, T, P, and Q are configured through parameters. The number of thelayer where the Q cells are located must be smaller than four. In other words, the Q cells mustbe non-Umbrella cells.

l P indicates the number of observed cells for fast movement.

l Q indicates the number of valid cells for fast movement.


A target cell should meet the following conditions:

l The number of the layer where a target cell is located must be equal to or greater than four.In other words, a target cell must be an Umbrella cell.

l The RX level of a target cell is equal to or greater than the sum of the Inter-layer HOThreshold of the cell and the Inter-layer HO Hysteresis of the cell. A good level conditionis met.

l The neighbor cell with the highest priority after the sorting should be preprocessed.

Limitations

After the fast movement handover from a micro cell to a macro cell is successful, penalty isperformed on all the neighbor cells. During the penalty, penalty level is subtracted from the levelof all the neighbor cells. The penalty time and penalty level are configured through parameters.




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Cell Layer and Cell Hierarchy

Through the multiband handover algorithm developed by Huawei, a proper traffic volumedistribution can be realized among multiple frequency bands.

Huawei multiband handover algorithm divides cells into four layers with 16 hierarchies in eachlayer. Thus, the cells are grouped by Cell Layer and are applicable for complex networkingmodes. Figure 7-6 shows the cell layers.

Figure 7-6 Cell layer

Layer 4

Layer 3

Layer 2

Layer 1

Macro Cell

Micro Cell

Pico Cell

Umbrella CellGSM900

GSM900GSM900

DCS1800DCS1800

GSM900GSM900 GSM900GSM900

DCS1800DCS1800

DCS1800DCS1800DCS1800

GSM900

In the multiband handover algorithm developed by Huawei, a GSM network covering a certainarea is divided into four layers, which are described as follows.

l Layer 4: Umbrella cell. The umbrella cell is generally a GSM900 cell with wide coverage.This type of cell is used for coverage and fast MS connection.

l Layer 3: Macro cell. The macro cell is generally composed of GSM900 cells. This type ofcell is most commonly used in the current GSM system, serving the majority of users.

l Layer 2: Micro cell. The micro cell is generally composed of DCS1800 cells with smallcoverage. This type of cell is used for capacity expansion, relieving the insufficiency offrequency resources.

l Layer 1: Pico cell. The pico cell is generally composed of DCS1800 cells. This type of cellis used in hot spots and blind spots.

The cell in the low layer has a high priority.

Inter-Layer (Better Cell) Handover

This describes inter-layer (better cell) handover. To balance the traffic volume flexibly and tomeet the requirements of different topology modes, the GSM network is divided into severallayers. If inter-layer handover is used, the cells with lower layer level and lower hierarchy levelare possibly enabled to absorb traffic. If the layer level or hierarchy level is low, the value ofthe layer level or hierarchy level is great.



7-19

Triggering ConditionsThe triggering conditions of inter-layer handover are as follows:

l The layer level of the target cell is lower than the layer level of the serving cell. In otherwords, the absolute value of the layer level for the target cell is greater than the absolutevalue of the layer level for the serving cell.

l The downlink level of the target cell is greater than the Inter-layer HO Threshold.

l P/N criterion is met. In other words, within N seconds, the previous conditions are met forP seconds.

Target Cell SelectionA target cell should meet the following conditions:

l The triggering conditions are met.

l The serving cell cannot serve as the target cell.

l Among the sorted candidate cells after the preprocessing procedures, the target cell has thehighest priority.

LimitationsThe limitations on inter-layer handover are as follows:

l The layer level of the target cell is lower than the layer level of the serving cell.

l The downlink level of the target cell is greater than the inter-layer handover threshold.



l P/N criterion is met.

PBGT HandoverThis describes power budget (PBGT) handover, which is based on path loss.

In PBGT handover, the system performs real-time searches for a cell with less path loss and incompliance with the system requirements. Then, the system determines whether a handover isrequired. Compared with other handover algorithms, the greatest difference lies in that the PBGThandover is triggered based on path loss instead of receiver level.

Triggering ConditionsThe triggering conditions of the PBGT handover are as follows:

l The target cell and the serving cell are at the same layer and in the same hierarchy.

l The downlink level meets the following formula:(MIN(MS_TXPWR_MAX,P) – RXLEV_DL – PWR_DIFF) – (MIN(MS_TXPWR_MAX(n),P) – RXLEV_NCELL(n)) > PBGT_HO_MARGINThe parameters are described as follows:– RXLEV_DL: It indicates the downlink receive level in the serving cell after the filtering

treatment. If the enhanced concentric cell function is enabled in the serving cell, the




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value indicates the downlink receive level in the serving cell that serves as the neighborcell, that is, the downlink receive level of BCCH TRXs.

– MS_TXPWR_MAX: It indicates the maximum transmit power of an MS permitted inthe serving cell.

– MS_TXPWR_MAX (n): It indicates the maximum transmit power of an MS permittedin neighbor cell n.

– RxLev_NCELL (n): It indicates the downlink receive level in neighbor cell n.

– PWR_DIFF: It indicates the difference between the maximum downlink transmit powerin the serving cell due to power control and the actual downlink transmit power in theserving cell.

– P: It indicates the maximum transmit power capability of an MS.

– PBGT_HO_MARGIN: It is the difference between the PBGT handover threshold ofthe serving cell and 64.

– The difference between the path loss of the downlink level in the serving cell and thepath loss of the downlink level in the neighbor cell is greater than the threshold.

l P/N criterion is met. In other words, within N seconds, the previous conditions are met forP seconds.


A target cell should meet the following conditions:

l The target cell and the serving cell are at the same layer and in the same hierarchy.


l Among the sorted candidate cells after the preprocessing procedures, the target cell has thehighest priority.

Limitations

The limitations on the PBGT handover are as follows:


l An SDCCH handover is forbidden.

l The target cell and the serving cell must be at the same layer and in the same hierarchy.

Other Handovers

This describes other handovers, which consist of AMR handover and better 3G cell handover.

AMR Handover

Refer to 11 AMR.

Better 3G cell handover

Refer to 8 2G/3G Interoperability.



7-21

7.4 ImplementationThis describes how to configure the handover and the power boost before handover.

7.4.1 Configuring the HandoverConfigure handover through the BSC6000 Local Maintenance Terminal.

7.4.2 Configuring Power Boost Before HandoverThis describes how to configure power boost before handover on the BSC6000 LocalMaintenance Terminal.

7.4.1 Configuring the HandoverConfigure handover through the BSC6000 Local Maintenance Terminal.

ContextBefore configuring the parameters related to the handover decision algorithm, you need toconfigure the relation between neighbor cells.

On the BSC6000 Local Maintenance Terminal, right-click a cell on the Management Treetab page. Then, choose Set Adjacent Relation Property on the shortcut menu. A dialog box isdisplayed, as shown in Figure 7-7.

Figure 7-7 Data configuration in a neighbor cell




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Procedure

Step 1 On the BSC6000 Local Maintenance Terminal, right-click a cell on the Management Treetab page. Then, choose Configure Cell Attributes on the shortcut menu, as shown in Figure7-8.

Figure 7-8 Configuring Cells Attributes dialog box (1)

Step 2 Double-click the target cell in the Cell view list box to add it to the Selected cells list box.

Step 3 Click Next. A dialog box is displayed, as shown in Figure 7-9.



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Figure 7-9 Configuring Cells Attributes dialog box (2)

Step 4 In the Cells to be set area, select the target cell, and then click Set Cell Properties. A dialogbox is displayed, as shown in Figure 7-10.




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Figure 7-10 Set Cell Attributes tab page

Step 5 Click Handover Data. A dialog box is displayed, as shown in Figure 7-11.



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Figure 7-11 Browse Handover Parameter[Cell: Cell1] dialog box

Step 6 Click Advanced. A dialog box is displayed. You can set corresponding parameters, as shownin Figure 7-12.




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Figure 7-12 Set Handover Parameter[Cell: Cell1] dialog box

l Measurement report preprocessingPreprocessing of a measurement report consists of interpolation and filtering. Figure 7-13shows the parameter configuration.

Figure 7-13 Filter/Penalty Data tab page

The parameters are as follows:– Allowed MR Number Lost

– Filter Length for TCH Level

– Filter Length for TCH Qual



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– Filter Length for SDCCH Level

– Filter Length for SDCCH Qual

– Filter Length for Ncell RX_LEV

– Filter Length for TA

l Handover Penalty

The handover penalty consists of handover failure penalty, BQ handover penalty, TAhandover penalty, fast movement handover penalty, penalty of fast movement handover froma micro cell to a macro cell, and concentric cell handover penalty. Figure 7-13 and Figure7-12 show the parameter configuration.

The parameters are as follows:

– Penalty Allowed

– Penalty Level after HO Fail

– Penalty Time after HO Fail(s)

– Penalty Level after BQ HO

– Penalty Time after BQ HO (s)

– Penalty Level after TA HO

– Penalty Time after TA HO(s)

– Penalty Time after AMR TCHF-H HO Fails(s)

l Neighbor cell queuing

The neighbor cell queuing consists of basic cell queuing and adjustment based on networkcharacteristics. Figure 7-12, Figure 7-7, and Figure 7-14 show the parameter configuration.

Figure 7-14 Cell HO Data tab page

The parameters are as follows:

– Min DL Level on Candidate Cell




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– Inter-cell Handover Hysteresis

– Layer of the Cell

– Cell Priority

– Load HO Threshold

– Load Req. on Candidate Cell

– Inter-layer HO Threshold

– Inter-layer HO Hysteresis

l TA HandoverFigure 7-15 shows the configuration of TA handover parameters.

Figure 7-15 Emergency HO Data tab page

The parameters are as follows:TA Threshold

l BQ HandoverFigure 7-15 shows the configuration of BQ handover parameters.The parameters are as follows:DL Qual. Threshold

l Rapid level drop handoverFigure 7-11 and Figure 7-15 show the configuration of rapid level drop handoverparameters.The parameters are as follows:– Rx_Level_Drop HO Allowed

– Filter Parameter A1–A8

– Filter Parameter B

l Interference handover



7-29

Figure 7-11 and Figure 7-15 show the configuration of interference handover parameters.The parameters are as follows:– Interference HO Allowed

– UL Qual. Threshold for Interf HO

– DL Qual. Threshold for Interf HO

– UL RX_LEV Threshold for Interf HO

– DL RX_LEV Threshold for Interf HO

l No Downlink Measurement Report HandoverFigure 7-11 and Figure 7-15 show the configuration of no downlink measurement reporthandover parameters.The parameters are as follows:– No Dl Mr. HO Allowed

– No Dl Mr. Ul Qual HO Limit

– Cons. No Dl Mr. HO Allowed Limit

l Load HandoverFigure 7-11 and Figure 7-14 show the configuration of load handover parameters.The parameters are as follows:– Load HO Allowed

– System Flux Threshold for Load HO

– Load HO Threshold

– Load Req. on Candidate Cell

– Load HO Bandwidth

– Load HO Step Period

– Load HO Step Level

l Edge HandoverFigure 7-11 shows the configuration of edge handover parameters.The parameters are as follows:– Edge HO UL RX_LEV Threshold

– Edge HO DL RX_LEV Threshold

– Edge HO Watch Time(s)

– Edge HO Valid Time(s)

l Fast Movement Handover from a Micro Cell to a Macro CellFigure 7-11 and Figure 7-14 show the configurations of the parameters of the fast movementhandover from a micro cell to a macro cell.The parameters are as follows:– MS Fast Moving HO Allowed

– MS Fast-moving Watch Cells

– MS Fast-moving Valid Cells

– MS Fast-moving Time Threshold




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l Inter-layer handoverFigure 7-7 and Figure 7-14 show the configuration of inter-layer handover parameters. Theparameters in the previous dialog boxes are listed in Neighbor cell queuing.

l PBGT HandoverFigure 7-11 shows the configuration of PBGT handover parameters.The parameters are as follows:– PBGT HO Allowed– PBGT Watch Time(s)– PBGT Valid Time(s)

l Fast Movement HandoverFigure 7-16 shows the configuration of fast movement handover parameters.– Quick Handover Enable– Quick Handover Up Triger Level– Quick Handover Down Triger Level– Quick Move Speed Thres– Quick Handover Static Time– Quick Handover Last Time– Serving Cell Filter Length– Neighbor Cell Filter Length– Quick Handover Punish Time– Ignore Measurement Report Number– Quick Handover Offset– Quick Handover Punish Value– Chain Neighbor Cell

NOTE

For the setting of Chain Neighbor Cell, refer to Figure 7-7.



7-31

Figure 7-16 Emergency HO Data tab page

l AMR HandoverRefer to 11 AMR.

l Better 3G cell handoverRefer to 8 2G/3G Interoperability.

l Data configuration in a neighbor cellFigure 7-7 shows the data configuration in a neighbor cell.The parameters are as follows:– Min Access Level Offset– PBGT HO Threshold

----End

7.4.2 Configuring Power Boost Before HandoverThis describes how to configure power boost before handover on the BSC6000 LocalMaintenance Terminal.

Procedure

Step 1 On the BSC6000 Local Maintenance Terminal, right-click a cell on the Management Treetab page. Then, choose Configure Cell Attributes on the shortcut menu, as shown in Figure7-17.




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Figure 7-17 Selecting a cell

Step 2 Double-click the target cell in the Cell view list box to add it to the Selected cells list box.

Step 3 Click Next. A dialog box is displayed, as shown in Figure 7-18.

Figure 7-18 Configuring Cell Attributes dialog box

Step 4 In the Cells to be set area, select the target cell, and then click Set Cell Properties. A dialogbox is displayed, as shown in Figure 7-19.



7-33

Figure 7-19 Setting cell attributes

Step 5 Click Other Attributes. A dialog box is displayed, as shown in Figure 7-20.

Set Handover Power Boost Switch.




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Figure 7-20 Setting cell attributes

Step 6 Click OK. The configuration is complete.

----End

7.5 Maintenance InformationThis lists the performance counters related to handover.

AlarmsNone

CountersTable 7-3 lists the counters related to handover.



7-35

Table 7-3 Counters related to handover

Counter Description

H3000 Internal Intra-Cell Handover Requests (SDCCH)

H3009 Internal Intra-Cell Handover Requests (TCH)

H3010 Internal Intra-Cell Handover Commands(SDCCH)

H3017 Internal Intra-Cell Handover Commands(TCHF)

H3018 Internal Intra-Cell Handover Commands(TCHH)

H3020 Failed Internal Intra-Cell Handovers (SDCCH)

H3029 Failed Internal Intra-Cell Handovers (TCH)

H3020A Failed Internal Intra-Cell Handovers (ChannelUnavailable) (SDCCH)

H3029A Failed Internal Intra-Cell Handovers (ChannelUnavailable) (TCH)

H302B Failed Internal Intra-Cell Handovers (TerrestrialResource Request Failed)

H302G Failed Internal Intra-Cell Handovers (A InterfaceFailure)

H3020C Failed Internal Intra-Cell Handovers (TimerExpired) (SDCCH)

H3027Cb Failed Internal Intra-Cell Handovers (TimerExpired) (TCHF) (Signaling Channel)

H3028Cb Failed Internal Intra-Cell Handovers (TimerExpired) (TCHH) (Signaling Channel)

H3027Ca Failed Internal Intra-Cell Handovers (TimerExpired) (TCHF) (Traffic Channel)

H3028Ca Failed Internal Intra-Cell Handovers (TimerExpired) (TCHH) (Traffic Channel)

H302Da Failed Internal Intra-Cell Handovers(Reconnection to Old Channels) (AbnormalRelease, Unspecified)

H302Db Failed Internal Intra-Cell Handovers(Reconnection to Old Channels) (AbnormalRelease, Channel Unacceptable)

H302Dc Failed Internal Intra-Cell Handovers(Reconnection to Old Channels) (AbnormalRelease, Timer Expired)




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Counter Description

H302Dd Failed Internal Intra-Cell Handovers(Reconnection to Old Channels) (AbnormalRelease, No Activity on the Radio Path)

H302De Failed Internal Intra-Cell Handovers(Reconnection to Old Channels) (PreemptiveRelease)

H302Df Failed Internal Intra-Cell Handovers(Reconnection to Old Channels) (HandoverFailed, Timing Advance out of Range)

H302Dg Failed Internal Intra-Cell Handovers(Reconnection to Old Channels) (Channel ModeUnavailable)

H302Dh Failed Internal Intra-Cell Handovers(Reconnection to Old Channels) (FrequencyUnavailable)

H302Di Failed Internal Intra-Cell Handovers(Reconnection to Old Channels) (Call AlreadyCleared)

H302Dj Failed Internal Intra-Cell Handovers(Reconnection to Old Channels) (SemanticallyIncorrect Message)

H302Dk Failed Internal Intra-Cell Handovers(Reconnection to Old Channels) (InvalidMandatory Information)

H302Dl Failed Internal Intra-Cell Handovers(Reconnection to Old Channels) (Message TypeNon-existent or Not Implemented)

H302Dm Failed Internal Intra-Cell Handovers(Reconnection to Old Channels) (Message TypeNot Compatible with Protocol State)

H302Dn Failed Internal Intra-Cell Handovers(Reconnection to Old Channels) (Conditional IEError)

H302Do Failed Internal Intra-Cell Handovers(Reconnection to Old Channels) (No CellAllocation Available)

H302Dp Failed Internal Intra-Cell Handovers(Reconnection to Old Channels) (Protocol ErrorUnspecified)

H302Dq Failed Internal Intra-Cell Handovers(Reconnection to Old Channels) (Other Causes)



7-37

Counter Description

H3002 Internal Intra-Cell Handover Requests (Underlayto Overlay)

H3001 Internal Intra-Cell Handover Requests (Overlayto Underlay)

H3012 Internal Intra-Cell Handover Commands(Underlay to Overlay)

H3011 Internal Intra-Cell Handover Commands(Overlay to Underlay)

H3022A Failed Internal Intra-Cell Handovers (ChannelUnavailable) (Underlay to Overlay)

H3021A Failed Internal Intra-Cell Handovers (ChannelUnavailable) (Overlay to Underlay)

H3022M Failed Internal Intra-Cell Handovers (OtherCauses) (Underlay to Overlay)

H3021M Failed Internal Intra-Cell Handovers (OtherCauses) (Overlay to Underlay)

H3003A Internal Intra-Cell Handover Requests (DynamicConversion, TCHF-TCHH)

H3003B Internal Intra-Cell Handover Requests (DynamicConversion, TCHH-TCHF)

H3004A Internal Intra-Cell Handover Requests (DynamicConversion, TCH-SDCCH)

H3004B Internal Intra-Cell Handover Requests (DynamicConversion, SDCCH-TCH)

H3013A Internal Intra-Cell Handover Commands(Dynamic Conversion, TCHF-TCHH)

H3013B Internal Intra-Cell Handover Commands(Dynamic Conversion, TCHH-TCHF)

H3014A Internal Intra-Cell Handover Commands(Dynamic Conversion, TCH-SDCCH)

H3014B Internal Intra-Cell Handover Commands(Dynamic Conversion, SDCCH-TCH)

H3023A Failed Internal Intra-Cell Handovers (DynamicConversion, TCHF-TCHH)

H3023B Failed Internal Intra-Cell Handovers (DynamicConversion, TCHH-TCHF)

H3024A Failed Internal Intra-Cell Handovers (DynamicConversion, TCH-SDCCH)




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Counter Description

H3024B Failed Internal Intra-Cell Handovers (DynamicConversion, SDCCH-TCH)

H3055A Internal Intra-Cell Handovers Not Initiated(AMR) (TCHF-TCHH)

H3055B Internal Intra-Cell Handovers Not Initiated(AMR) (TCHH-TCHF)

H3005A Internal Intra-Cell Handover Requests (AMR)(TCHF-TCHH)

H3005B Internal Intra-Cell Handover Requests (AMR)(TCHH-TCHF)

H3015A Internal Intra-Cell Handover Commands (AMR)(TCHF-TCHH)

H3015B Internal Intra-Cell Handover Commands (AMR)(TCHH-TCHF)

H3025A Failed Internal Intra-Cell Handovers (AMR)(TCHF-TCHH)

H3025B Failed Internal Intra-Cell Handovers (AMR)(TCHH-TCHF)

H3040 Internal Intra-Cell Handover Detection MessagesReceived by BSC (SDCCH)

H3047 Internal Intra-Cell Handover Detection MessagesReceived by BSC (TCHF)

H3048 Internal Intra-Cell Handover Detection MessagesReceived by BSC (TCHH)

H3200W Incoming Internal Inter-Cell Handover Requests(SDCCH) (900/850-900/850)

H3200X Incoming Internal Inter-Cell Handover Requests(SDCCH) (1800/1900-1800/1900)

H3200Y Incoming Internal Inter-Cell Handover Requests(SDCCH) (900/850-1800/1900)

H3200Z Incoming Internal Inter-Cell Handover Requests(SDCCH) (1800/1900-900/850)

H3209W Incoming Internal Inter-Cell Handover Requests(TCH) (900/850-900/850)

H3209X Incoming Internal Inter-Cell Handover Requests(TCH) (1800/1900-1800/1900)

H3209Y Incoming Internal Inter-Cell Handover Requests(TCH) (900/850-1800/1900)



7-39

Counter Description

H3209Z Incoming Internal Inter-Cell Handover Requests(TCH) (1800/1900-900/850)

H3210W Incoming Internal Inter-Cell HandoverResponses (SDCCH) (900/850-900/850)

H3210X Incoming Internal Inter-Cell HandoverResponses (SDCCH) (1800/1900-1800/1900)

H3210Y Incoming Internal Inter-Cell HandoverResponses (SDCCH) (900/850-1800/1900)

H3210Z Incoming Internal Inter-Cell HandoverResponses (SDCCH) (1800/1900-900/850)

H3217W Incoming Internal Inter-Cell HandoverResponses (TCHF) (900/850-900/850)

H3217X Incoming Internal Inter-Cell HandoverResponses (TCHF) (1800/1900-1800/1900)

H3217Y Incoming Internal Inter-Cell HandoverResponses (TCHF) (900/850-1800/1900)

H3217Z Incoming Internal Inter-Cell HandoverResponses (TCHF) (1800/1900-900/850)

H3218W Incoming Internal Inter-Cell HandoverResponses (TCHH) (900/850-900/850)

H3218X Incoming Internal Inter-Cell HandoverResponses (TCHH) (1800/1900-1800/1900)

H3218Y Incoming Internal Inter-Cell HandoverResponses (TCHH) (900/850-1800/1900)

H3218Z Incoming Internal Inter-Cell HandoverResponses (TCHH) (1800/1900-900/850)

H3220W (Failed Incoming Internal Inter-Cell Handovers(SDCCH) (900/850-900/850)

H3220X (Failed Incoming Internal Inter-Cell Handovers(SDCCH) (1800/1900-1800/1900)

H3220Y (Failed Incoming Internal Inter-Cell Handovers(SDCCH) (900/850-1800/1900)

H3220Z (Failed Incoming Internal Inter-Cell Handovers(SDCCH) (1800/1900-900/850)

H3229W (Failed Incoming Internal Inter-Cell Handovers(TCH) (900/850-900/850)

H3229X (Failed Incoming Internal Inter-Cell Handovers(TCH) (1800/1900-1800/1900)




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Counter Description

H3229Y (Failed Incoming Internal Inter-Cell Handovers(TCH) (900/850-1800/1900)

H3229Z (Failed Incoming Internal Inter-Cell Handovers(TCH) (1800/1900-900/850)

H3220A Failed Incoming Internal Inter-Cell Handovers(No Channel Available) (SDCCH)

H3229A Failed Incoming Internal Inter-Cell Handovers(No Channel Available) (TCH)

H322B Failed Incoming Internal Inter-Cell Handovers(Terrestrial Resource Request Failed)

H322D Failed Incoming Internal Inter-Cell Handovers(Reconnection to Old Channels)

H322G Failed Incoming Internal Inter-Cell Handovers(A Interface Failure)

H3220C Failed Incoming Internal Inter-Cell Handovers(Timer Expired) (SDCCH)

H3227Cb Failed Incoming Internal Inter-Cell Handovers(Timer Expired) (TCHF) (Signaling Channel)

H3228Cb Failed Incoming Internal Inter-Cell Handovers(Timer Expired) (TCHH) (Signaling Channel)

H3227Ca Failed Incoming Internal Inter-Cell Handovers(Timer Expired) (TCHF) (Traffic Channel)

H3228Ca Failed Incoming Internal Inter-Cell Handovers(Timer Expired) (TCHH) (Traffic Channel)

H3240 Incoming Internal Inter-Cell Handover DetectionMessages Received by BSC (SDCCH)

H3247 Incoming Internal Inter-Cell Handover DetectionMessages Received by BSC (TCHF)

H3248 Incoming Internal Inter-Cell Handover DetectionMessages Received by BSC (TCHH)

H3100W Outgoing Internal Inter-Cell Handover Requests(SDCCH) (Excluding Directed Retry)(900/850-900/850)

H3100X Outgoing Internal Inter-Cell Handover Requests(SDCCH) (Excluding Directed Retry)(1800/1900-1800/1900)

H3100Y Outgoing Internal Inter-Cell Handover Requests(SDCCH) (Excluding Directed Retry)(900/850-1800/1900)



7-41

Counter Description

H3100Z Outgoing Internal Inter-Cell Handover Requests(SDCCH) (Excluding Directed Retry)(1800/1900-900/850)

H3107W Outgoing Internal Inter-Cell Handover Requests(TCHF) (Excluding Directed Retry)(900/850-900/850)

H3107X Outgoing Internal Inter-Cell Handover Requests(TCHF) (Excluding Directed Retry)(1800/1900-1800/1900)

H3107Y Outgoing Internal Inter-Cell Handover Requests(TCHF) (Excluding Directed Retry)(900/850-1800/1900)

H3107Z Outgoing Internal Inter-Cell Handover Requests(TCHF) (Excluding Directed Retry)(1800/1900-900/850)

H3108W Outgoing Internal Inter-Cell Handover Requests(TCHH) (Excluding Directed Retry)(900/850-900/850)

H3108X Outgoing Internal Inter-Cell Handover Requests(TCHH) (Excluding Directed Retry)(1800/1900-1800/1900)

H3108Y Outgoing Internal Inter-Cell Handover Requests(TCHH) (Excluding Directed Retry)(900/850-1800/1900)

H3108Z Outgoing Internal Inter-Cell Handover Requests(TCHH) (Excluding Directed Retry)(1800/1900-900/850)

H3101W Outgoing Internal Inter-Cell Handover Requests(Directed Retry) (900/850-900/850)

H3101X Outgoing Internal Inter-Cell Handover Requests(Directed Retry) (1800/1900-1800/1900)

H3101Y Outgoing Internal Inter-Cell Handover Requests(Directed Retry) (900/850-1800/1900)

H3101Z Outgoing Internal Inter-Cell Handover Requests(Directed Retry) (1800/1900-900/850)

H3110W Outgoing Internal Inter-Cell HandoverCommands (SDCCH) (Excluding Directed Retry)(900/850-900/850)

H3110X Outgoing Internal Inter-Cell HandoverCommands (SDCCH) (Excluding Directed Retry)(1800/1900-1800/1900)




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Counter Description

H3110Y Outgoing Internal Inter-Cell HandoverCommands (SDCCH) (Excluding Directed Retry)(900/850-1800/1900)

H3110Z Outgoing Internal Inter-Cell HandoverCommands (SDCCH) (Excluding Directed Retry)(1800/1900-900/850)

H3117W Outgoing Internal Inter-Cell HandoverCommand (TCHF) (Excluding Directed Retry)(900/850-900/850)

H3117X Outgoing Internal Inter-Cell HandoverCommand (TCHF) (Excluding Directed Retry)(1800/1900-1800/1900)

H3117Y Outgoing Internal Inter-Cell HandoverCommand (TCHF) (Excluding Directed Retry)(900/850-1800/1900)

H3117Z Outgoing Internal Inter-Cell HandoverCommand (TCHF) (Excluding Directed Retry)(1800/1900-900/850)

H3118W Outgoing Internal Inter-Cell HandoverCommand (TCHH) (Excluding Directed Retry)(900/850-900/850)

H3118X Outgoing Internal Inter-Cell HandoverCommand (TCHH) (Excluding Directed Retry)(1800/1900-1800/1900)

H3118Y Outgoing Internal Inter-Cell HandoverCommand (TCHH) (Excluding Directed Retry)(900/850-1800/1900)

H3118Z Outgoing Internal Inter-Cell HandoverCommand (TCHH) (Excluding Directed Retry)(1800/1900-900/850)

H3111W Outgoing Internal Inter-Cell HandoverCommands (Directed Retry) (900/850-900/850)

H3111X Outgoing Internal Inter-Cell HandoverCommands (Directed Retry)(1800/1900-1800/1900)

H3111Y Outgoing Internal Inter-Cell HandoverCommands (Directed Retry) (900/850-1800/1900)

H3111Z Outgoing Internal Inter-Cell HandoverCommands (Directed Retry) (1800/1900-900/850)



7-43

Counter Description

H3120W Failed Outgoing Internal Inter-Cell Handovers(SDCCH) (Excluding Directed Retry)(900/850-900/850)

H3120X Failed Outgoing Internal Inter-Cell Handovers(SDCCH) (Excluding Directed Retry)(1800/1900-1800/1900)

H3120Y Failed Outgoing Internal Inter-Cell Handovers(SDCCH) (Excluding Directed Retry)(900/850-1800/1900)

H3120Z Failed Outgoing Internal Inter-Cell Handovers(SDCCH) (Excluding Directed Retry)(1800/1900-900/850)

H3127W Failed Outgoing Internal Inter-Cell Handovers(TCHF) (Excluding Directed Retry)(900/850-900/850)

H3127X Failed Outgoing Internal Inter-Cell Handovers(TCHF) (Excluding Directed Retry)(1800/1900-1800/1900)

H3127Y Failed Outgoing Internal Inter-Cell Handovers(TCHF) (Excluding Directed Retry)(900/850-1800/1900)

H3127Z Failed Outgoing Internal Inter-Cell Handovers(TCHF) (Excluding Directed Retry)(1800/1900-900/850)

H3128W Failed Outgoing Internal Inter-Cell Handovers(TCHH) (Excluding Directed Retry)(900/850-900/850)

H3128X Failed Outgoing Internal Inter-Cell Handovers(TCHH) (Excluding Directed Retry)(1800/1900-1800/1900)

H3128Y Failed Outgoing Internal Inter-Cell Handovers(TCHH) (Excluding Directed Retry)(900/850-1800/1900)

H3128Z Failed Outgoing Internal Inter-Cell Handovers(TCHH) (Excluding Directed Retry)(1800/1900-900/850)

H3121W Failed Outgoing Internal Inter-Cell Handovers(Directed Retry) (900/850-900/850)

H3121X Failed Outgoing Internal Inter-Cell Handovers(Directed Retry) (1800/1900-1800/1900)




Issue 03 (2008-01-25)

Counter Description

H3121Y Failed Outgoing Internal Inter-Cell Handovers(Directed Retry) (900/850-1800/1900)

H3121Z Failed Outgoing Internal Inter-Cell Handovers(Directed Retry) (1800/1900-900/850)

H312A Failed Outgoing Internal Inter-Cell Handovers(No Channel Available)

H312B Failed Outgoing Internal Inter-Cell Handovers(Terrestrial Resource Request Failed)

H312G Failed Outgoing Internal Inter-Cell Handovers (AInterface Failure)

H3120C Failed Outgoing Internal Inter-Cell Handovers(Timer Expired) (SDCCH) (Excluding DirectedRetry)

H3127Cb Failed Outgoing Internal Inter-Cell Handovers(Timer Expired) (TCHF) (Signaling Channel)

H3128Cb Failed Outgoing Internal Inter-Cell Handovers(Timer Expired) (TCHH) (Signaling Channel)

H3127Ca Failed Outgoing Internal Inter-Cell Handovers(Timer Expired) (TCHF) (Traffic Channel)

H3128Ca Failed Outgoing Internal Inter-Cell Handovers(Timer Expired) (TCHH) (Traffic Channel)

H3121C Failed Outgoing Internal Inter-Cell Handovers(Timer Expired) (Directed Retry)

H312Da Failed Outgoing Internal Inter-Cell Handovers(Reconnection to Old Channels) (AbnormalRelease, Unspecified)

H312Db Failed Outgoing Internal Inter-Cell Handovers(Reconnection to Old Channels) (AbnormalRelease, Channel Unacceptable)

H312Dc Failed Outgoing Internal Inter-Cell Handovers(Reconnection to Old Channels) (AbnormalRelease, Timer Expired)

H312Dd Failed Outgoing Internal Inter-Cell Handovers(Reconnection to Old Channels) (AbnormalRelease, No Activity on the Radio Path)

H312De Failed Outgoing Internal Inter-Cell Handovers(Reconnection to Old Channels) (PreemptiveRelease)



7-45

Counter Description

H312Df Failed Outgoing Internal Inter-Cell Handovers(Reconnection to Old Channels) (HandoverFailed, Timing Advance out of Range)

H312Dg Failed Outgoing Internal Inter-Cell Handovers(Reconnection to Old Channels) (Channel ModeUnavailable)

H312Dh Failed Outgoing Internal Inter-Cell Handovers(Reconnection to Old Channels) (FrequencyUnavailable)

H312Di Failed Outgoing Internal Inter-Cell Handovers(Reconnection to Old Channels) (Call AlreadyCleared)

H312Dj Failed Outgoing Internal Inter-Cell Handovers(Reconnection to Old Channels) (SemanticallyIncorrect Message)

H312Dk Failed Outgoing Internal Inter-Cell Handovers(Reconnection to Old Channels) (InvalidMandatory Information)

H312Dl Failed Outgoing Internal Inter-Cell Handovers(Reconnection to Old Channels) (Message TypeNon-existent or Not Implemented)

H312Dm Failed Outgoing Internal Inter-Cell Handovers(Reconnection to Old Channels) (Message TypeNot Compatible with Protocol State)

H312Dn Failed Outgoing Internal Inter-Cell Handovers(Reconnection to Old Channels) (Conditional IEError)

H312Do Failed Outgoing Internal Inter-Cell Handovers(Reconnection to Old Channels) (No CellAllocation Available)

H312Dp Failed Outgoing Internal Inter-Cell Handovers(Reconnection to Old Channels) (Protocol ErrorUnspecified)

H312Dq Failed Outgoing Internal Inter-Cell Handovers(Reconnection to Old Channels) (Other Causes)

H310A Outgoing Internal Inter-Cell Handover Requests(Uplink Quality)

H310B Outgoing Internal Inter-Cell Handover Requests(Downlink Quality)

H310C Outgoing Internal Inter-Cell Handover Requests(Uplink Strength)




Issue 03 (2008-01-25)

Counter Description

H310D Outgoing Internal Inter-Cell Handover Requests(Downlink Strength)

H310E Outgoing External Inter-Cell Handover Requests(Timing Advance)

H310F Outgoing Internal Inter-Cell Handover Requests(Better Cell)

H310G Outgoing Internal Inter-Cell Handover Requests(Load)

H310H Outgoing Internal Inter-Cell Handover Requests(Rapid Level Drop)

H310I Outgoing Internal Inter-Cell Handover Requests(MSC Intervention)

H310J Outgoing Internal Inter-Cell Handover Requests(OM Intervention)

H310L Outgoing Internal Inter-Cell Handover Requests(Other Causes)

H311A Outgoing Internal Inter-Cell HandoverCommands (Uplink Quality)

H311B Outgoing Internal Inter-Cell HandoverCommands (Downlink Quality)

H311C Outgoing Internal Inter-Cell HandoverCommands (Uplink Strength)

H311D Outgoing Internal Inter-Cell HandoverCommands (Downlink Strength)

H311E Outgoing External Inter-Cell HandoverCommands (Timing Advance)

H311F Outgoing Internal Inter-Cell HandoverCommands (Better Cell)

H311G Outgoing Internal Inter-Cell HandoverCommands (Load)

H311H Outgoing Internal Inter-Cell HandoverCommands (Rapid Level Drop)

H311I Outgoing Internal Inter-Cell HandoverCommands (MSC Intervention)

H311J Outgoing Internal Inter-Cell HandoverCommands (OM Intervention)

H311L Outgoing Internal Inter-Cell HandoverCommands (Other Causes)



7-47

Counter Description

H3122A Failed Outgoing Internal Inter-Cell Handovers(Uplink Quality)

H3122B Failed Outgoing Internal Inter-Cell Handovers(Downlink Quality)

H3122C Failed Outgoing Internal Inter-Cell Handovers(Uplink Strength)

H3122D Failed Outgoing Internal Inter-Cell Handovers(Downlink Strength)

H3122E Failed Outgoing Internal Inter-Cell Handovers(Timing Advance)

H3122F Failed Outgoing Internal Inter-Cell Handovers(Better Cell)

H3122G Failed Outgoing Internal Inter-Cell Handovers(Load)

H3122H Failed Outgoing Internal Inter-Cell Handovers(Rapid Level Drop)

H3122I Failed Outgoing Internal Inter-Cell Handovers(MSC Intervention)

H3122J Failed Outgoing Internal Inter-Cell Handovers(OM Intervention)

H3122L Failed Outgoing Internal Inter-Cell Handovers(Other Causes)

H3400W Incoming External Inter-Cell Handover Requests(SDCCH) (900/850-900/850)

H3400X Incoming External Inter-Cell Handover Requests(SDCCH) (1800/1900-1800/1900)

H3400Y Incoming External Inter-Cell Handover Requests(SDCCH) (900/850-1800/1900)

H3400Z Incoming External Inter-Cell Handover Requests(SDCCH) (1800/1900-900/850)

H3409W Incoming External Inter-Cell Handover Requests(TCH) (900/850-900/850)

H3409X Incoming External Inter-Cell Handover Requests(TCH) (1800/1900-1800/1900)

H3409Y Incoming External Inter-Cell Handover Requests(TCH) (900/850-1800/1900)

H3409Z Incoming External Inter-Cell Handover Requests(TCH) (1800/1900-900/850)




Issue 03 (2008-01-25)

Counter Description

H3410W Incoming External Inter-Cell HandoverResponses (SDCCH) (900/850-900/850)

H3410X Incoming External Inter-Cell HandoverResponses (SDCCH) (1800/1900-1800/1900)

H3410Y Incoming External Inter-Cell HandoverResponses (SDCCH) (900/850-1800/1900)

H3410Z Incoming External Inter-Cell HandoverResponses (SDCCH) (1800/1900-900/850)

H3417W Incoming External Inter-Cell HandoverResponses (TCHF) (900/850-900/850)

H3417X Incoming External Inter-Cell HandoverResponses (TCHF) (1800/1900-1800/1900)

H3417Y Incoming External Inter-Cell HandoverResponses (TCHF) (900/850-1800/1900)

H3417Z Incoming External Inter-Cell HandoverResponses (TCHF) (1800/1900-900/850)

H3418W Incoming External Inter-Cell HandoverResponses (TCHH) (900/850-900/850)

H3418X Incoming External Inter-Cell HandoverResponses (TCHH) (1800/1900-1800/1900)

H3418Y Incoming External Inter-Cell HandoverResponses (TCHH) (900/850-1800/1900)

H3418Z Incoming External Inter-Cell HandoverResponses (TCHH) (1800/1900-900/850)

H3420W Failed Incoming External Inter-Cell Handovers(SDCCH) (900/850-900/850)

H3420X Failed Incoming External Inter-Cell Handovers(SDCCH) (1800/1900-1800/1900)

H3420Y Failed Incoming External Inter-Cell Handovers(SDCCH) (900/850-1800/1900)

H3420Z Failed Incoming External Inter-Cell Handovers(SDCCH) (1800/1900-900/850)

H3429W Failed Incoming External Inter-Cell Handovers(TCH) (900/850-900/850)

H3429X Failed Incoming External Inter-Cell Handovers(TCH) (1800/1900-1800/1900)

H3429Y Failed Incoming External Inter-Cell Handovers(TCH) (900/850-1800/1900)



7-49

Counter Description

H3429Z Failed Incoming External Inter-Cell Handovers(TCH) (1800/1900-900/850)

H3401B Incoming External Inter-Cell Handover TCHRequests (TCHF Only)

H3401C Incoming External Inter-Cell Handover TCHRequests (TCHH Only)

H3401D Incoming External Inter-Cell Handover TCHRequests (TCHF Preferred, Channel TypeUnchangeable)

H3401E Incoming External Inter-Cell Handover TCHRequests (TCHH Preferred, Channel TypeUnchangeable)

H3401G Incoming External Inter-Cell Handover TCHRequests (TCHF Preferred, Channel TypeChangeable)

H3401H Incoming External Inter-Cell Handover TCHRequests (TCHH Preferred, Channel TypeChangeable)

H3401F Incoming External Inter-Cell Handover TCHRequests (TCHF or TCHH, Channel TypeUnchangeable)

H3401I Incoming External Inter-Cell Handover TCHRequests (TCHF or TCHH, Channel TypeChangeable)

H342I Failed Incoming External Inter-Cell Handovers(Invalid Message)

H3420A Failed Incoming External Inter-Cell Handovers(No Channel Available) (SDCCH)

H3429A Failed Incoming External Inter-Cell Handovers(No Channel Available) (TCH)

H342E Failed Incoming External Inter-Cell Handovers(CIC Unavailable)

H342F Failed Incoming External Inter-Cell Handovers(CIC Allocated)

H342B Failed Incoming External Inter-Cell Handovers(Terrestrial Resource Request Failed)

H342H Failed Incoming External Inter-Cell Handovers(Clear Commands Sent By MSC)




Issue 03 (2008-01-25)

Counter Description

H3420C Failed Incoming External Inter-Cell Handovers(Timer Expired) (SDCCH)

H3429Cb Failed Incoming External Inter-Cell Handovers(Timer Expired) (TCH) (Signaling Channel)

H3429Ca Failed Incoming External Inter-Cell Handovers(Timer Expired) (TCH) (Traffic Channel)

H3440 Incoming External Inter-Cell HandoverDetection Messages Received by BSC (SDCCH)

H3447 Incoming External Inter-Cell HandoverDetection Messages Received by BSC (TCHF)

H3448 Incoming External Inter-Cell HandoverDetection Messages Received by BSC (TCHH)

H3300W Outgoing External Inter-Cell Handover Requests(SDCCH) (Excluding Directed Retry)(900/850-900/850)

H3300X Outgoing External Inter-Cell Handover Requests(SDCCH) (Excluding Directed Retry)(1800/1900-1800/1900)

H3300Y Outgoing External Inter-Cell Handover Requests(SDCCH) (Excluding Directed Retry)(900/850-1800/1900)

H3300Z Outgoing External Inter-Cell Handover Requests(SDCCH) (Excluding Directed Retry)(1800/1900-900/850)

H3310W Outgoing External Inter-Cell HandoverCommands (SDCCH) (Excluding Directed Retry)(900/850-900/850)

H3310X Outgoing External Inter-Cell HandoverCommands (SDCCH) (Excluding Directed Retry)(1800/1900-1800/1900)

H3310Y Outgoing External Inter-Cell HandoverCommands (SDCCH) (Excluding Directed Retry)(900/850-1800/1900)

H3310Z Outgoing External Inter-Cell HandoverCommands (SDCCH) (Excluding Directed Retry)(1800/1900-900/850)

H3317W Outgoing External Inter-Cell HandoverCommands (TCHF) (Excluding Directed Retry)(900/850-900/850)



7-51

Counter Description

H3317X Outgoing External Inter-Cell HandoverCommands (TCHF) (Excluding Directed Retry)(1800/1900-1800/1900)

H3317Y Outgoing External Inter-Cell HandoverCommands (TCHF) (Excluding Directed Retry)(900/850-1800/1900)

H3317Z Outgoing External Inter-Cell HandoverCommands (TCHF) (Excluding Directed Retry)(1800/1900-900/850)

H3318W Outgoing External Inter-Cell HandoverCommands (TCHH) (Excluding Directed Retry)(900/850-900/850)

H3318X Outgoing External Inter-Cell HandoverCommands (TCHH) (Excluding Directed Retry)(1800/1900-1800/1900)

H3318Y Outgoing External Inter-Cell HandoverCommands (TCHH) (Excluding Directed Retry)(900/850-1800/1900)

H3318Z Outgoing External Inter-Cell HandoverCommands (TCHH) (Excluding Directed Retry)(1800/1900-900/850)

H3311W Outgoing External Inter-Cell HandoverCommands (Directed Retry) (900/850-900/850)

H3311X Outgoing External Inter-Cell HandoverCommands (Directed Retry)(1800/1900-1800/1900)

H3311Y Outgoing External Inter-Cell HandoverCommands (Directed Retry) (900/850-1800/1900)

H3311Z Outgoing External Inter-Cell HandoverCommands (Directed Retry) (1800/1900-900/850)

H3320W Failed Outgoing External Inter-Cell Handovers(SDCCH) (Excluding Directed Retry)(900/850-900/850)

H3320X Failed Outgoing External Inter-Cell Handovers(SDCCH) (Excluding Directed Retry)(1800/1900-1800/1900)

H3320Y Failed Outgoing External Inter-Cell Handovers(SDCCH) (Excluding Directed Retry)(900/850-1800/1900)




Issue 03 (2008-01-25)

Counter Description

H3320Z Failed Outgoing External Inter-Cell Handovers(SDCCH) (Excluding Directed Retry)(1800/1900-900/850)

H3327W Failed Outgoing External Inter-Cell Handovers(TCHF) (Excluding Directed Retry)(900/850-900/850)

H3327X Failed Outgoing External Inter-Cell Handovers(TCHF) (Excluding Directed Retry)(1800/1900-1800/1900)

H3327Y Failed Outgoing External Inter-Cell Handovers(TCHF) (Excluding Directed Retry)(900/850-1800/1900)

H3327Z Failed Outgoing External Inter-Cell Handovers(TCHF) (Excluding Directed Retry)(1800/1900-900/850)

H3328W Failed Outgoing External Inter-Cell Handovers(TCHH) (Excluding Directed Retry)(900/850-900/850)

H3328X Failed Outgoing External Inter-Cell Handovers(TCHH) (Excluding Directed Retry)(1800/1900-1800/1900)

H3328Y Failed Outgoing External Inter-Cell Handovers(TCHH) (Excluding Directed Retry)(900/850-1800/1900)

H3328Z Failed Outgoing External Inter-Cell Handovers(TCHH) (Excluding Directed Retry)(1800/1900-900/850)

H3321W Failed Outgoing External Inter-Cell Handovers(Directed Retry) (900/850-900/850)

H3321X Failed Outgoing External Inter-Cell Handovers(Directed Retry) (1800/1900-1800/1900)

H3321Y Failed Outgoing External Inter-Cell Handovers(Directed Retry) (900/850-1800/1900)

H3321Z Failed Outgoing External Inter-Cell Handovers(Directed Retry) (1800/1900-900/850)

H330A Outgoing Internal Inter-Cell Handover Requests(Uplink Quality)

H330B Outgoing External Inter-Cell Handover Requests(Downlink Quality)



7-53

Counter Description

H330C Outgoing External Inter-Cell Handover Requests(Uplink Strength)

H330D Outgoing External Inter-Cell Handover Requests(Downlink Strength)

H330E Outgoing External Inter-Cell Handover Requests(Timing Advance)

H330F Outgoing External Inter-Cell Handover Requests(Better Cell)

H330G Outgoing External Inter-Cell Handover Requests(Load)

H330H Outgoing External Inter-Cell Handover Requests(Rapid Level Drop)

H330I Outgoing External Inter-Cell Handover Requests(MSC Intervention)

H330J Outgoing External Inter-Cell Handover Requests(OM Intervention)

H330L Outgoing External Inter-Cell Handover Requests(Other Causes)

H331A Outgoing External Inter-Cell HandoverCommands (Uplink Quality)

H331B Outgoing External Inter-Cell HandoverCommands (Downlink Quality)

H331C Outgoing External Inter-Cell HandoverCommands (Uplink Strength)

H331D Outgoing External Inter-Cell HandoverCommands (Downlink Strength)

H331E Outgoing External Inter-Cell HandoverCommands (Timing Advance)

H331F Outgoing External Inter-Cell HandoverCommands (Better Cell)

H331G Outgoing External Inter-Cell HandoverCommands (Load)

H331H Outgoing External Inter-Cell HandoverCommands (Rapid Level Drop)

H331I Outgoing External Inter-Cell HandoverCommands (MSC Intervention)

H331J Outgoing External Inter-Cell HandoverCommands (OM Intervention)




Issue 03 (2008-01-25)

Counter Description

H331L Outgoing External Inter-Cell HandoverCommands (Other Causes)

H3322A Failed Outgoing External Inter-Cell Handovers(Uplink Quality)

H3322B Failed Outgoing External Inter-Cell Handovers(Downlink Quality)

H3322C Failed Outgoing External Inter-Cell Handovers(Uplink Strength)

H3322D Failed Outgoing External Inter-Cell Handovers(Downlink Strength)

H3322E Failed Outgoing External Inter-Cell Handovers(Timing Advance)

H3322F Failed Outgoing External Inter-Cell Handovers(Better Cell)

H3322G Failed Outgoing External Inter-Cell Handovers(Load)

H3322H Failed Outgoing External Inter-Cell Handovers(Rapid Level Drop)

H3322I Failed Outgoing External Inter-Cell Handovers(MSC Intervention)

H3322J Failed Outgoing External Inter-Cell Handovers(OM Intervention)

H3322L Failed Outgoing External Inter-Cell Handovers(Other Causes)

H332Ka Failed Outgoing External Inter-Cell Handovers(Handover Request Rejected) (OM Intervention)

H332Kb Failed Outgoing External Inter-Cell Handovers(Handover Request Rejected) (EquipmentFailure)

H332Kc Failed Outgoing External Inter-Cell Handovers(Handover Request Rejected) (No RadioResource Available)

H332Kd Failed Outgoing External Inter-Cell Handovers(Handover Request Rejected) (RequestedTerrestrial Resource Unavailable)

H332Ke Failed Outgoing External Inter-Cell Handovers(Handover Request Rejected) (BSS not Equipped)

H332Kf Failed Outgoing External Inter-Cell Handovers(Handover Request Rejected) (Invalid Cell)



7-55

Counter Description

H332Kg Failed Outgoing External Inter-Cell Handovers(Handover Request Rejected) (RequestedTranscoding/Rate Adaption Unavailable)

H332Kh Failed Outgoing External Inter-Cell Handovers(Handover Request Rejected) (Circuit PoolMismatch)

H332Ki Failed Outgoing External Inter-Cell Handovers(Handover Request Rejected) (Requested SpeechVersion Unavailable)

H332Kj Failed Outgoing External Inter-Cell Handovers(Handover Request Rejected) (CipheringAlgorithm not Supported)

H332Kk Failed Outgoing External Inter-Cell Handovers(Handover Request Rejected) (Terrestrial circuitalready allocated)

H332Kl Failed Outgoing External Inter-Cell Handovers(Handover Request Rejected) (Invalid Message)

H332Km Failed Outgoing External Inter-Cell Handovers(Handover Request Rejected) (Protocol Errorbetween BSS and MSC)

H332Kn Failed Outgoing External Inter-Cell Handovers(Handover Request Rejected) (Other Causes)

H332Da Failed Outgoing External Inter-Cell Handovers(Reconnection to Old Channels) (AbnormalRelease, Unspecified)

H332Db Failed Outgoing External Inter-Cell Handovers(Reconnection to Old Channels) (AbnormalRelease, Channel Unacceptable)

H332Dc Failed Outgoing External Inter-Cell Handovers(Reconnection to Old Channels) (AbnormalRelease, Timer Expired)

H332Dd Failed Outgoing External Inter-Cell Handovers(Reconnection to Old Channels) (AbnormalRelease, No Activity on the Radio Path)

H332De Failed Outgoing External Inter-Cell Handovers(Reconnection to Old Channels) (PreemptiveRelease)

H332Df Failed Outgoing External Inter-Cell Handovers(Reconnection to Old Channels) (HandoverFailed, Timing Advance out of Range)




Issue 03 (2008-01-25)

Counter Description

H332Dg Failed Outgoing External Inter-Cell Handovers(Reconnection to Old Channels) (Channel ModeUnavailable)

H332Dh Failed Outgoing External Inter-Cell Handovers(Reconnection to Old Channels) (FrequencyUnavailable)

H332Di Failed Outgoing External Inter-Cell Handovers(Reconnection to Old Channels) (Call AlreadyCleared)

H332Dj Failed Outgoing External Inter-Cell Handovers(Reconnection to Old Channels) (SemanticallyIncorrect Message)

H332Dk Failed Outgoing External Inter-Cell Handovers(Reconnection to Old Channels) (InvalidMandatory Information)

H332Dl Failed Outgoing External Inter-Cell Handovers(Reconnection to Old Channels) (Message TypeNon-existent or Not Implemented)

H332Dm Failed Outgoing External Inter-Cell Handovers(Reconnection to Old Channels) (Message TypeNot Compatible with Protocol State)

H332Dn Failed Outgoing External Inter-Cell Handovers(Reconnection to Old Channels) (Conditional IEError)

H332Do Failed Outgoing External Inter-Cell Handovers(Reconnection to Old Channels) (No CellAllocation Available)

H332Dp Failed Outgoing External Inter-Cell Handovers(Reconnection to Old Channels) (Protocol ErrorUnspecified)

H332Dq Failed Outgoing External Inter-Cell Handovers(Reconnection to Old Channels) (Other Causes)

H332Ha Failed Outgoing External Inter-Cell Handovers(Clear Commands Sent By MSC) (Radio InterfaceMessage Failure)

H332Hb Failed Outgoing External Inter-Cell Handovers(Clear Commands Sent By MSC) (Radio InterfaceFailure)

H332Hc Failed Outgoing External Inter-Cell Handovers(Clear Commands Sent By MSC) (OMIntervention)



7-57

Counter Description

H332Hd Failed Outgoing External Inter-Cell Handovers(Clear Commands Sent By MSC) (EquipmentFailure)

H332He Failed Outgoing External Inter-Cell Handovers(Clear Commands Sent By MSC) (Preemption)

H332Hf Failed Outgoing External Inter-Cell Handovers(Clear Commands Sent By MSC) (InvalidMessage)

H332Hg Failed Outgoing External Inter-Cell Handovers(Clear Commands Sent By MSC) (Protocol Errorbetween BSS and MSC)

H332Hh Failed Outgoing External Inter-Cell Handovers(Clear Commands Sent By MSC) (Other Causes)

H332G Failed Outgoing External Inter-Cell Handovers(A Interface Failure)

H3320L Failed Outgoing External Inter-Cell Handovers(T7 Expiry) (SDCCH) (Excluding Directed Retry)

H3327Lb Failed Outgoing External Inter-Cell Handovers(T7 Expiry) (TCHF) (Signaling Channel)

H3328Lb Failed Outgoing External Inter-Cell Handovers(T7 Expiry) (TCHH) (Signaling Channel)

H3327La Failed Outgoing External Inter-Cell Handovers(T7 Expired) (TCHF) (Traffic Channel)

H3328La Failed Outgoing External Inter-Cell Handovers(T7 Expired) (TCHH) (Traffic Channel)

H3321L Failed Outgoing External Inter-Cell Handovers(T7 Expired) (Directed Retry)

H3320C Failed Outgoing External Inter-Cell Handovers(T8 Expiry) (SDCCH) (Excluding Directed Retry)

H3327Cb Failed Outgoing External Inter-Cell Handovers(T8 Expiry) (TCHF) (Signaling Channel)

H3328Cb Failed Outgoing External Inter-Cell Handovers(T8 Expiry) (TCHH) (Signaling Channel)

H3327Ca Failed Outgoing External Inter-Cell Handovers(T8 Expired) (TCHF) (Traffic Channel)

H3328Ca Failed Outgoing External Inter-Cell Handovers(T8 Expired) (TCHH) (Traffic Channel)

H3321C Failed Outgoing External Inter-Cell Handovers(T8 Expired) (Directed Retry)




Issue 03 (2008-01-25)

Counter Description

H3303 Outgoing External Inter-Cell Handover Requests(Different Signaling Points)

H3313 Outgoing External Inter-Cell HandoverCommands (Different Signaling Points)

H3323 Failed Outgoing External Inter-Cell Handovers(Different Signaling Points)

H3307W Outgoing External Inter-Cell Handover Requests(TCHF) (Excluding Directed Retry)(900/850-900/850)

H3307X Outgoing External Inter-Cell Handover Requests(TCHF) (Excluding Directed Retry)(1800/1900-1800/1900)

H3307Y Outgoing External Inter-Cell Handover Requests(TCHF) (Excluding Directed Retry)(900/850-1800/1900)

H3307Z Outgoing External Inter-Cell Handover Requests(TCHF) (Excluding Directed Retry)(1800/1900-900/850)

H3308W Outgoing External Inter-Cell Handover Requests(TCHH) (Excluding Directed Retry)(900/850-900/850)

H3308X Outgoing External Inter-Cell Handover Requests(TCHH) (Excluding Directed Retry)(1800/1900-1800/1900)

H3308Y Outgoing External Inter-Cell Handover Requests(TCHH) (Excluding Directed Retry)(900/850-1800/1900)

H3308Z Outgoing External Inter-Cell Handover Requests(TCHH) (Excluding Directed Retry)(1800/1900-900/850)

H3301W Outgoing External Inter-Cell Handover Requests(Directed Retry) (900/850-900/850)

H3301X Outgoing External Inter-Cell Handover Requests(Directed Retry) (1800/1900-1800/1900)

H3301Y Outgoing External Inter-Cell Handover Requests(Directed Retry) (900/850-1800/1900)

H3301Z Outgoing External Inter-Cell Handover Requests(Directed Retry) (1800/1900-900/850)

H380 Cell Incoming Handover Requests



7-59

Counter Description

H382A Failed Cell Incoming Handovers (Congestion)

H382M Failed Cell Incoming Handovers (Other Causes)

H371A Cell Outgoing Handover Commands (UplinkQuality)

H371B Cell Outgoing Handover Commands (DownlinkQuality)

H371C Cell Outgoing Handover Commands (UplinkStrength)

H371D Cell Outgoing Handover Commands (DownlinkStrength)

H371E Cell Outgoing Handover Commands (TimingAdvance)

H371F Cell Outgoing Handover Commands (Better Cell)

H371G Cell Outgoing Handover Commands (Load)

H371H Cell Outgoing Handover Commands (RapidLevel Drop)

H371I Cell Outgoing Handover Commands (MSCIntervention)

H371J Cell Outgoing Handover Commands (OMIntervention)

H371L Cell Outgoing Handover Commands (OtherCauses)

H372A Failed Cell Outgoing Handovers (Uplink Quality)

H372B Failed Cell Outgoing Handovers (DownlinkQuality)

H372C Failed Cell Outgoing Handovers (UplinkStrength)

H372D Failed Cell Outgoing Handovers (DownlinkStrength)

H372E Failed Cell Outgoing Handovers (TimingAdvance)

H372F Failed Cell Outgoing Handovers (Better Cell)

H372G Failed Cell Outgoing Handovers (Load)

H372H Failed Cell Outgoing Handovers (Rapid LevelDrop)




Issue 03 (2008-01-25)

Counter Description

H372I Failed Cell Outgoing Handovers (MSCIntervention)

H372J Failed Cell Outgoing Handovers (OMIntervention)

H372L Failed Cell Outgoing Handovers (Other Causes)

S3300C Number of MRs during Handover Initiation(Uplink Receive Level Rank = 0)








S3310C Number of MRs during Handover Initiation(Uplink Receive Quality Rank = 0)










7-61

Counter Description

AS330C Mean Uplink Receiving Level during HandoverInitiation

AS331C Mean Uplink Receive Quality during HandoverInitiation

AS330A Mean Uplink Receive Level during ConcentricCell Handover Initiation (Overlay to Underlay)

AS332A Mean Downlink Receive Level during ConcentricCell Handover Initiation (Overlay to Underlay)

AS330B Mean Uplink Receive Level during ConcentricCell Handover Initiation (Underlay to Overlay)

AS332B Mean Downlink Receive Level during ConcentricCell Handover Initiation (Underlay to Overlay)

AS334A Mean Timing Advance during Concentric CellHandover Initiation (Overlay to Underlay)

AS334B Mean Timing Advance during Concentric CellHandover Initiation (Underlay to Overlay)

7.6 References

l GSM 08.58

l GSM 04.08




Issue 03 (2008-01-25)

01-07 handover

Documents

outgoing external inter

incoming external inter

incoming internal inter

outgoing internal inter

excluding directed retry

poor radio environment

handover request rejected

failed internal intra