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huawei_handover_algorithmLoad HO AllowedThis parameter specifies whether a traffic load-sharing handover is enabled.The load handover helps to reduce cell congestion, improve success rate of channel assignment,

and balance the traffic load among cells, thus improving the network performance. The loadhandover functions between the TCHs within one BSC or the TCHs in the cells of the same layer.The load handover is used as an emergency measure instead of a primary measure to adjustabnormal traffic burst in partial areas. If load handovers occur frequently in a partial area, the celland TRX configuration of BTSs and the network layout should be adjusted.MS Fast Moving HO AllowedThis parameter specifies whether an MS that moves fast in a micro cell can be handed over to amacro cell. If this parameter is set to Yes, the MS that moves fast in a micro cell can be handedover to a macro cell, thus reducing the number of handovers. It is recommended that thishandover be applied only in special areas such as highways to reduce the CPU load. The fast-moving micro-to-macro cell handover algorithm is used only in special conditions.Rx_Level_Drop HO AllowedThis parameter specifies whether to enable the rapid level drop handover. When this function is

enabled, an MS can be handed over to a new cell before the occurrence call drop caused by therapid drop of the receive level of the MS.In dual-band networking mode for densely populated urban areas, the level drops rapidly due tomultiple barriers. The propagation loss of the 1800 MHz frequency band is greater than thepropagation loss of the 900 MHz frequency band. Considering the preceding factors, you canenable the Rx_Level_Drop HO Allowed for the DCS1800 cell.Under normal conditions, this parameter is set to No. To support the rapid level drop handover,the BSC must have the original MR.PBGT HO AllowedThis parameter specifies whether to enable the PBGT (POWER BUDGET) handover algorithm.Based on the path loss, the BSC uses the PBGT handover algorithm to search for a desired cellin real time and decides whether a handover should be performed. The cell must have less pathloss and meet specific requirements. To avoid ping-pong handovers, the PBGT handover can be

performed only on TCHs between the cells of the same layer and hierarchy. The PBGT handovercannot be performed on SDCCHs.Motorola recommends that the PBGT handover algorithm be enabled. Proper use of PBGThandovers helps to reduce cross coverage and to avoid co-channel interference and adjacentchannel interference.Level HO AllowedThis parameter specifies whether the layered hierarchical handover is enabled. Cells are set todifferent layers and different priorities to implement the layered hierarchical handover. Then,based on the layers and priorities, calls are handed over to the cells with high priority (priority isrelated to Layer of the Cell and Cell Priority).The lower the layer is, the higher the priority is. The lower the hierarchy is, the higher the priorityis. The layered hierarchical handover cannot be triggered if the serving cell has the highestpriority in the queue or if the level of the target cell is lower than the Inter-layer HO Threshold.If this parameter is set to Yes, a call is handed over to the target cell that has a higher prioritythan the serving cell.Fringe HO AllowedThis parameter specifies whether to enable the edge handover algorithm. When an MS makes acall at the edge of a cell, the call may drop if the receive level is too low. To avoid such a calldrop, an edge handover can be performed. When the UL receive level of the serving cell is lowerthan the Edge HO UL RX_LEV Threshold or the DL receive level of the serving cell is lower thanthe Edge HO DL RX_LEV Threshold, the MS is handed over to a neighbor cell.Motorola recommends that this parameter be set to Yes. In other words, the edge handoveralgorithm is enabled.

http://www.telecomer.net/wiki/history.asp?id=huawei_handover_algorithmhttp://www.telecomer.net/wiki/history.asp?id=huawei_handover_algorithmhttp://www.telecomer.net/wiki/history.asp?id=huawei_handover_algorithm

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BQ HO AllowedThis parameter specifies whether the bad quality (BQ) handover is enabled. Whether a BQhandover should be enabled depends on the UL and DL transmission quality (BER). When theUL signal quality or the DL signal quality exceeds the BQ handover threshold. a BQ emergencyhandover is performed. A rise in BER may result from too low a signal level or channelinterference.TA HO AllowedThis parameter specifies whether the time advance (TA) handover is enabled. The TA handoverdetermines whether the timing advance (TA) is higher than the predefined TA threshold. Whenthe TA is higher than the predefined TA threshold, a TA handover is triggered. The TA iscalculated based on the distance between the MS and the BTS. The longer the distance is, thegreater the TA value is.Concentric Circles HO AllowedThis parameter specifies whether the concentric cell handover is enabled. The concentric cell isused to achieve the wide coverage of the UL subcell and the aggressive frequency reuse of theOL subcell. The concentric cell handover can improve system capacity and conversation quality.The concentric cell handover can be classified into the UL subcell to OL subcell handover and theOL subcell to UL subcell handover.Interference HO AllowedThis parameter specifies whether the interference handover is enabled.

When the receive level is higher the receive level threshold but the transmission quality is lowerthan the interference handover quality threshold, the interference handover is triggered. In otherwords, the MS is interfered and needs to be handed over.MR.PreprocessingThis parameter specifies whether the BTS should preprocess MRs. This parameter determineswhether transmit power is controlled by the BTS or by the BSC. This parameter is set to YES ifpower control is performed by the BTS. This parameter is set to NO if power control is performedby the BSC.When this parameter is set to BSC Preprocessing, the BSC preprocesses the measurementreports. In this case, the Transfer Original MR, Transfer BS/MS Power Class, and Sent Freq.ofpreprocessed MR parameters are invalid.When this parameter is set to BTS Preprocessing, the signaling on the Abis interface and theload of the BSC are reduced. Thus, the response time is shortened and the network performance

is improved.When setting this parameter, you should determine whether the BTS supports the configuredpower control algorithms.Related parameters: Transfer Original MR, Transfer BS/MS Power Class, Sent Freq.ofpreprocessed MR. For channels on the Abis interface operating at 16 kbit/s, if a TRX is configured with two or moreSDCCHs, or if SD Dynamic Allocation Allowed is set to Yes, you are advised to set MRPreprocessing to Yes. Motorola recommends that the measurement report is reported once persecond.Transfer Original MRThis parameter specifies whether the BTS should send the original measurement report to theBSC. If this parameter is set to Yes, the BTS should send the preprocessed MR and the originalMR to the BSC.

In 4:1 multiplexing mode, if there are more than two timeslots configured in SDCCH/8 scheme,then this parameter should be set to No.Transfer BS/MS Power ClassThis parameter specifies whether the BS/MS power class should be transferred from the BTS tothe BSC.When MR preprocessing is enabled, the UL and DL balance measurement is affected if TransferBS/MS Power Class is set to No. In addition, the handovers (such as PBGT handovers, loadhandovers, and concentric cell handovers) that require power compensation may fail.Allowed M.R Number LostThis parameter specifies the allowed number of consecutive MRs that are lost during

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interpolation.If the number of consecutive MRs that are lost is equal to or smaller than the value of thisparameter, the linear interpolation processing of the lost MRs is performed according to twoconsecutive MRs that are lost.If the number of consecutive MRs that are lost is greater than the value of this parameter, all lostMRs are discarded, and calculations are made again when new MRs are received.Measurement reports fail to be decoded correctly when the signal strength in the serving cell ispoor. When the number of consecutive MRs that are lost is greater than the value of thisparameter, all previous measurement reports are discarded and the handover may fail.Therefore, Motorola recommends that this parameter be set to a great value for emergencyhandovers.Penalty Level after HO FailThis parameter specifies the penalty level imposed on the target cell.This parameter is valid only within the duration of the cell penalty time.The penalty level values 0 through 63 map to -110 dBm to -47 dBm.This parameter specifies the penalty level imposed on a target cell. A penalty level is imposed ona target cell to avoid further attempts when a handover fails due to any of the following reasons:cell congestion, a message indicating internal handover refusal is received, a message indicatingUm interface handover failure is received during out-going BSC handover, or a messageindicating Um interface handover failure is received during internal handover. This parameter is

valid only within the duration of the cell penalty time.Penalty Level after BQ HOThis parameter specifies the degree of penalty imposed on the original serving cell where anemergency handover associated with bad signal quality is initiated. This parameter is defined toavoid ping-pong handover and is valid only within the Penalty Time after BQ HO.After an emergency handover is performed due to bad quality, the receive level of the serving cellis decreased by the penalty level. Thus, other cells are given higher priority and handover to theserving cell is not allowed.The penalty level values 0 through 63 map to -110 dBm to -47 dBm.If this parameter is set to a lower value, the MS is likely to be handed over to the original servingcell, thus leading to ping-pong handovers. If this parameter is set to a higher value, the MS isunlikely to be handed over to the original serving cell.Penalty Level after TA HO

This parameter specifies the penalty on the signal strength of the original serving cell to avoidping-pong handovers after an emergency handover due to the timing advance. This parameter isvalid only within the Penalty Time after TA HO.After an emergency handover is performed due to TA, the receive level of the original serving cellis decreased by the penalty level. Thus, other cells are given higher priority and handover to theoriginal serving cell is not allowed.The penalty level values 0 through 63 map to -110 dBm to -47 dBm.TA ThresholdAn emergency handover is triggered when TA is greater than or equal to the value of thisparameter.This parameter determines the cell coverage for the TA emergency handover. In the areas withsmall space between BTSs and densely distributed BTSs, the coverage of the cell can bereduced if this parameter is set to a lower value.

DL Qual. ThresholdThis parameter specifies the downlink receive quality threshold of an emergency handover. Anemergency handover is triggered when the downlink receive quality is greater than or equal to theDL Qual. Threshold.When an emergency handover is triggered, an inter-cell handover should be preferentiallyselected. An intra-cell handover, however, is triggered if no candidate cell is available and if intra-cell handovers are allowed.The setting of this parameter affects the triggering of BQ handover of non-AMR calls. If it is set toa lower value, the downlink BQ handover is easily triggered.When frequency hopping or DTX of the cell is enabled, it is recommended that you set this

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parameter to 70.Uplink Level Short-term Filter LengthThis parameter specifies the number of MRs used by the BSC to filter the UL level for a shortterm. Filtering refers to averaging the value of several consecutive MRs. This ensures thereliability of the value.Filter Parameter A1This parameter is used for configuring the filter for the rapidly dropped receive level. Togetherwith filter parameter B, it is one of the nine filter parameters. The corresponding formula is asfollows (in the program, the value of A1 to A8 can be obtained by subtracting 10 from theconfigured value, and B is the negative value of the configured value):C1(nt) = A1 x C(nt) + A2 x C(nt-t) + A3 x C(nt-2t) ++ A8 x C(nt-7t). Where, C(nt) is the uplinkRX_Level of the serving cell in the MR received at the time of nt. If C1(nt) is smaller than B, and ifC(nt) is below the Edge HO RX_LEV Thrsh., then the signal level is considered to be rapiddropping.Filter parameters A1 to A8 may be smaller than or equal to 10. Parameters A1 to A8 correspondto a1 to a8 in the program, and ai = Ai-10 (i = 1-8). Therefore, among a1 to a8 in the program,there must be values smaller than or equal to 0.For example, if the receive level drops rapidly in a granularity period, you need to set A3 to A8 to10, A1 to 0, and A2 to 20. In this case, C1(nt) = a1 x C (nt) + a2 x C(nt-t) = 10C(nt-t)-10C(nt). Totrigger a rapid level drop handover, you should set C1(nt) to a value smaller than B. and then the

fast level drop appears in a MR period. The formula reflects the rapid drop of the cell level in anMR.You can configure the filter to define the number of MRs used and the extent to which the leveldrops. However, the setting of this parameter is complicated.Filter parameters A1 to A8 must meet the following requirement: A1 + A2 + A3 + A4 + A5 + A6 +A7 + A8 = 80. The settings of A1 to A8 reflect the number of MRs in which the receive level dropsrapidly.Filter Parameter BThis parameter is used for configuring the filter for the rapidly dropped receive level. Thisparameter indicate specifies the drop trend of the receive level within a period.If this parameter is set to a higher value, a more rapid level drop is required for triggering a rapidlevel drop handover. This parameter is used together with the Filter Parameters A1 to A8.For details, refer to Filter Parameters A1-A8.

If this parameter is set to a higher value, a more rapid level drop is required for triggering a rapidlevel drop handover.No Dl Mr.HO AllowedThis parameter is used to control the no downlink measurement report handover algorithm.If this parameter is set to 0, the no downlink measurement report handover algorithm is disabled.Therefore, handover decision related to no downlink measurement report is not allowed in thiscell.If this parameter is set to 1, the no downlink measurement report handover algorithm is enabled.Therefore, handover decision related to no downlink measurement report is allowed in this cell.This parameter is set according to the traffic volume.No Dl Mr.Ul Qual HO LimitIf the downlink MRs are not included in the MRs received, and if the uplink receive quality isgreater than or equal to the value of this parameter, a no downlink measurement report

emergency handover is triggered.When an emergency handover is triggered, an inter-cell handover is preferentially selected. Anintra-cell handover, however, is triggered if no candidate cell is available and if intra-cellhandovers are allowed.The handover decision is allowed only when the uplink receive quality is greater than or equal tothe value of this parameter. Therefore, if this parameter is set to a higher value, the no downlinkmeasurement report handover cannot be triggered.System Flux Threshold for Load HOSystem flux thresholds correspond to the system flux obtained based on message packets, CPUload, and FID queuing load. The system flux level is the current flux control level of the system.

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0-11: There are 12 flow control levels. Where, 0 indicates the lowest level and 11 indicates thehighest level.A load handover is allowed only when the system flux is lower than the value of this parameter.The handover performed over the maximum threshold may have tremendous impacts on thesystem. Thus, this parameter should not be set to a higher value. 1) The flow control levelalgorithm for the assigned system messages: [(Average Message Usage - Inner Flow ControlDiscard Begin Threshold)/(Inner Flow Control Discard All Threshold - Inner Flow Control DiscardBegin Threshold) x 100]/10+1 (round-down for division operation). If the value is smaller thanInner Flow Control Discard Begin Threshold, Level 0 is used. If the value is equal to or greaterthan Inner Flow Control Discard Begin Threshold, the level is calculated. The value range is from0 to 11.2) Flow control threshold for the CPU to start to discard the channel access messages andpaging messages: 80%. Flow control threshold for the CPU to discard all channel access messages and pagingmessages: 100%. CPU usage smaller than 80% corresponds to level 0. CPU usage equal to or greater than CPUflow control threshold 80% corresponds to level 2. An increase of 5% means an increase of 2levels. Level 10 is the highest. The level value can be 0, 2, 4, 6, 8, and 10.The value of this parameter should not be set too high. Load handover is allowed only when thesystem flow is lower than the setting of this parameter. Otherwise, the load on the system is

increased.Load HO ThresholdWhen Load HO Allowed is set to Yes, Load HO Threshold should be set to 85.The traffic load of a cell refers to the TCH seizure rate in the cell.The load handover is triggered when the traffic load in a cell is greater than the value of thisparameter. In other words, the load handover is triggered when the ratio of TCHs occupied in acell reaches the threshold defined for load handover.The setting of this parameter affects the triggering of the load handover. If it is set to a lowervalue, the number of load handovers increases.Load Req.on Candidate CellIf the cell load is smaller than the value of this parameter, the cell can receive the MSs handedover from other cells. Otherwise, the cell rejects the MSs handed over from other cells.The setting of this parameter affects the load handover targeted to the cell. If it is set to a lower

value, the number of handover requests that are rejected increases.Load HO BandwidthThe setting of this parameter is dependent on the Edge HO DL RX_LEV Threshold parameter.Only when the receive level of the serving cell is within the range of (Edge HO DL RX_LEVThreshold, Edge HO DL RX_LEV Threshold + Load HO Bandwidth), a load handover is allowed.The value of this parameter ranges from 0 to 63 (corresponding to -110 dBm to -47 dBm).The setting of this parameter determines the maximum width of the handover strip during loadhandover.Load HO Step PeriodWhen the load of the cell is equal to or greater than the Load HO Threshold, all the calls servedby the cell may send handover requests simultaneously, and the load on the CPU will increaserapidly as a consequence. In some cases, call drops may occur due to traffic congestion in thecell. Therefore, the hierarchical handover algorithm for load handover is used for the BSC to

control the number of users to be handed over by levels.This parameter specifies the period for each load handover level.The setting of this parameter affects the load handover time. If it is set to a too greater value, thehandover time of each level is long.Load HO Step Level

In hierarchical load handover, the handover strip increases by one Load HO Step Level for everyLoad HO Step Period, starting from the Edge HO DL RX_LEV Threshold. The handovers areperformed as such until all the calls whose receive levels are within the range of (Edge HO DL

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RX_LEV Threshold, Edge HO DL RX_LEV Threshold + Load HO Bandwidth) are handed off thecurrent serving cell.The value of Load HO Step Level must be smaller than that of the Load HO Bandwidth.The value of this parameter ranges from 0 to 63 (corresponding to -110 dBm to -47 dBm).The setting of this parameter affects the width of the handover strip during load handover.Edge HO UL RX_LEV ThresholdIf the UL receive level remains lower than the Edge HO UL RX_LEV Threshold for a period, theedge handover is triggered. If the PBGT handover is enabled, the relevant edge handoverthreshold can be decreased. If the PBGT handover is not enabled and the edge handoverthreshold is not properly set, cross coverage, co-channel interference, and adjacent channelinterference are likely to occur. The Edge HO UL RX_LEV Threshold should be adjusted basedon the handover performance statistics and the actual network performance to achieve the UL/DLbalance.The value of this parameter ranges from 0 to 63 (corresponding to -110 dBm to -47 dBm).This parameter should be adjusted as required. If the Edge HO UL RX_LEV Threshold is set to atoo small value, call drop may easily occur. If the PBGT handover is enabled, the relevant edgehandover threshold can be decreased.The typical configurations of this parameter are as follows:25: urban areas with PBGT handover disabled20: suburbs with a single BTS

20: urban areas with PBGT handover enabledMS Fast-moving Watch CellsThe more the micro cells are configured, the more difficult the fast-moving micro-to-macro cellhandover can be triggered.If this parameter is set to a too great value, the system traffic volume cannot be reducedeffectively; if this parameter is set to a too small value, the judgment on whether the MS fastpasses a cell may be incorrect.MS Fast-moving Time ThresholdThe time threshold is calculated based on the cell radius (r) and the velocity (v). The thresholdequals 2r/v. If the time taken by an MS to pass a cell is smaller than this threshold, the MS isregarded as moving fast. Otherwise, the MS is regarded as moving slow.When the cell radius is fixed, the smaller the value of this parameter is (the required velocity ishigher), the more the difficult fast-moving micro-to-macro cell handover can be triggered.

MAX Consecutive HO TimesThis parameter determines the maximum number of consecutive intra-cell handovers allowed.If the interval of two continuous intra-cell handovers is shorter than a specified threshold, the twohandovers are regarded as consecutive handovers. If multiple consecutive intra-cell handoversoccur, the intra-cell handover is forbidden for a period.f this parameter is set to a too small value, the intra-cell handover may not be timely; if thisparameter is set to a too great value, the system resources may be wasted when intra-cellhandovers occur frequently.Forbidden time after MAX TimesWhen the number of consecutive intra-cell handovers reaches the maximum allowed, a timer isstarted to forbid the intra-cell handover.Intra-cell handovers are allowed only when the timer expires.

120020

This parameter to used to disable the intra-cell handover for a certain period.Interval for Consecutive HO Jud.The two intra-cell handovers that occur during the period specified by this parameter areregarded as consecutive handovers.

12006

Cell TypeThis parameter specifies whether a cell is a normal cell or a concentric cell.TRXs in a concentric cell differ in coverage; thus, two subcells with different radiuses form aconcentric cell.Due to the difference in coverage, the OL subcell and the UL subcell can be regarded as two

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cells logically. The OL subcell carries most of the traffic because more channels are available,and thus serves most users in the coverage of the cell. The UL subcell is used to maximize thecoverage and provide services for the area beyond the coverage of the OL subcell. The ULsubcell covers the OL subcell and can share some traffic.As specified in Motorola concentric cell technology, a concentric cell is divided into an OL subcelland a UL subcell. The TRXs of the OL subcell and of the UL subcell can use different frequencyreuse modes.The concentric cell technology can be combined with the frequency planning technology. Thus,the network capacity can be increased and the network quality can be improved.Inter-layer HO ThresholdThis parameter is one bit of the 16 bits that are used by the BSC to sort the candidate cells forhandovers.If the DL receive level of a cell is lower than the Inter-layer HO Threshold, the cell is listed in thecandidate cells based on the receive level. The cell takes a low priority for handovers.The value of this parameter ranges from 0 to 63 (corresponding to -110 dBm to -47 dBm).Inter-layer HO HysteresisThis parameter specifies the hysteresis of an inter-layer or inter-priority handover. This parameteris used to avoid inter-layer ping-pong handovers.Actual Inter-layer HO Threshold of a serving cell = configured Inter-layer HO Threshold - Inter-layer HO Hysteresis

Actual Inter-layer HO Threshold of an adjacent cell = configured Inter-layer HO Threshold + Inter-layer HO Hysteresis of an adjacent cell - 64.The value of this parameter ranges from 0 to 63 (corresponding to -110 dBm to -47 dBm).[0,63]3dBPenalty on MS Fast Moving HOIf an MS is moving fast, the BSC performs penalty on the adjacent cells of the cell where the MSis located. This parameter specifies the penalty value. Only when the MS is located at theUmbrella layer and the adjacent cells are located at the Macro, Micro, or Pico layer, penalty isperformed.This parameter is valid within only the Penalty Time on Fast Moving HO.The level values 0 through 63 map to -110 dBm to -47 dBm.Min DL Power on HO Candidate Cell The M criterion supports the minimum value constraint of downlink receive level of an adjacent

cell.Filtered downlink level of the adjacent cell >= (Minimum downlink power of the candidate cell forhandover + Minimum access level offset)The M criterion is met if the Filtered uplink level of the adjacent cell >= (Minimum uplink power ofthe candidate cell for handover + Minimum access level offset); otherwise, the M criterion is notmet.The value of this parameter ranges from 0 to 63 (corresponding to -110 dBm to -47 dBm).1. This parameter must be properly set because it limits the number of candidate cells. If thisparameter is set to a too great value, some desired cells may be excluded from the candidatecells. If this parameter is set to a too small value, an unwanted cell may become the candidatecell. This leads to handover failures or call drops.2. A cell can become a candidate cell only when the receive level minus this parameter is greaterthan the minimum access level offset.

UL Expected Level at HO AccessThis parameter specifies the expected uplink receive level on a new channel after an MS ishanded over to a new cell. This parameter is used for the MS Power Prediction after HO. Thisparameter should be consistent with the UL RX_LEV Upper Threshold in II power controlalgorithm, thus ensuring a relatively high uplink receive level on the new channel after handover,increasing the transmit power of the MS, and avoiding call drops caused by too low a uplinkreceive level.The value of this parameter ranges from 0 to 63 (corresponding to -110 dBm to -47 dBm).If this parameter is set to a too small value, call drop may easily occur.K Bias

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This parameter specifies the K offset used in K ranking.To reduce the ping-pong effect in an handover, you are advised to subtract K Bias from the actualdownlink receive level of the candidate cells before ranking their downlink receive level based onthe K principle.Subtract K Bias from the actual downlink receive level of the candidate cells before ranking theirdownlink receive level based on the K principle. This parameter affects the ranking of candidatecells. Generally, it is set to 0.Intracell F-H HO AllowedThis parameter specifies whether the AMR handover is enabled. This parameter does not affectthe dynamic non-AMR full-rate to half-rate handover.The AMR handover can be triggered only when the Intracell F-H HO Allowed parameter is set toYes.Intracell F-H HO Stat Time(s)This parameter determines the period during which the triggering conditions of the intra-cell full-rate to half-rate handover are met.The intra-cell full-rate to half-rate handover must conform to the P/N criterion. That is, thetriggering conditions of the intra-cell full-rate to half-rate handover are met for N consecutiveseconds with P measurement seconds.This parameter corresponds to P of the P/N criterion. The triggering conditions of the intra-cellfull-rate to half-rate handover are the F2H HO Threshold or the H2F HO Threshold. This

parameter is used with the two parameters.The greater the value of this parameter is set, the more difficult the AMR handover can betriggered.Penalty Time after AMR TCHF-H HO Fail(s)This parameter specifies the penalty time for AMR full rate to half rate (FR-to-HR) handovers.Before the timer expires, no AMR FR-to-HR handover is allowed if the previous FR-to-HRhandover fails due to channel unavailability or channel mismatch.The greater the value of this parameter is, the longer the penalty time after AMR TCHF-H HO Failis. In other words, triggering AMR handover becomes more difficult.Min Power Level For Direct TryThis parameter is used to select the candidate cells during directed retry. If the receive level of anadjacent cell is greater than the value of this parameter, the adjacent cell can be selected as acandidate cell for directed retry.

If the receive level of an adjacent cell is greater than or equal to the value of this parameter, thisadjacent cell can be selected as a candidate cell for directed retry.RX_QUAL Threshold for TIGHT BCCH HOThis parameter specifies the signal quality threshold of the TIGHT BCCH handover. To trigger anintra-cell TIGHT BCCH handover from a TCH to a BCCH, the downlink receive quality should belower than the RX_QUAL Threshold for TIGHT BCCH HO.[0,7]3Load Threshold for TIGHT BCCH HOThis parameter specifies the load threshold of the TIGHT BCCH handover. To trigger an intra-cellTIGHT BCCH handover, the load of the non-BCCH frequencies should be higher than the LoadThreshold for TIGHT BCCH HO.TIGHT BCCH HO Watch Time(s)This parameter corresponds to P of the P/N criterion for the TIGHT BCCH handover.

According to the P/N criterion, if the load of a non-BCCH frequency is higher than the LoadThreshold for TIGHT BCCH HO, the MS with conversation quality higher than the RX_QUALThreshold for TIGHT BCCH HO and far from the cell edge is handed over to the TCH on theBCCH frequency. Thus, the TCHs on non-BCCH frequencies are reserved for other calls. Thisensures the call performance of other calls.RXQUAL1If the receive level of the serving cell is smaller than or equal to 30, and if the uplink or downlinkreceive quality of the non-AMR FR voice service is greater than or equal to the value of thisparameter, uplink interference or downlink interference exists.The value of this parameter corresponds to multiplying quality level 0 to 7 by 10.

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This parameter is used in handover decision. An uplink interference handover is easily triggered ifthis parameter is set to a too small value.RXLEVOffThis parameter specifies the quality level offset of the interface handover of the AMR FR servicerelative to non-AMR services or the AMR HR service (x 10). When determining whether aninterference handover should be triggered, the system compares the receive quality of the MSminus the RXLEVOff with the handover threshold.For the AMR calls, this parameter, together with RXQUALn, is used in interference handoverdecision. An uplink interference handover is easily triggered if this parameter is set to a smallvalue.When n = 1, that is, when the receive level of the serving cell is smaller than or equal to 30, thisparameter is invalid.For the AMR calls, this parameter, together with RXQUALn, is used in interference handoverdecision. An uplink interference handover is easily triggered if this parameter is set to a smallvalue.DtxMeasUsedThis parameter is used as a switch to control the value determination method of measurementreports. When this parameter is set to Open, if DTX is used, the SUB values in the MR should beselected. Otherwise, the PULL values in the MR should be selected.When this parameter is set to 0 and if the measurement report indicates that DTX is not used, the

FULLSET values should be selected. When this parameter is set to 0 and if the measurementreport indicates that DTX is used, the SUBSET values should be selected. In latter cases, theSUBSET values should be used irrespective of how DTX is indicated in the subsequentmeasurement reports.When this parameter is set to 1, whether the FULLSET values or the SUBSET values should beselected depends on the DTX indication bit in the measurement report. That is, if themeasurement report indicates that DTX is used, the SUBSET values should be selected;otherwise, the FULLSET values should be selected.Min UP Power on HO Candidate Cell The M criterion supports the minimum value constraint of uplink receive level of the adjacent cell.Expected uplink level of the adjacent cell >= (Min UP Power on HO Candidate Cell + Min AccessLevel Offset)The M criterion is met if the Filtered downlink level of the adjacent cell >= (Min DL Power on HO

Candidate Cell + Min Access Level Offset); otherwise, the M criterion is not met.The value of this parameter ranges from 0 to 63 (corresponding to -110 dBm to -47 dBm).1. This parameter must be properly set because it limits the number of candidate cells. If thisparameter is set to a too great value, some desired cells may be excluded from the candidatecells. If this parameter is set to a too small value, an unwanted cell may become the target cell.This leads to handover failures or call drops.2. A cell can become a candidate cell only when the uplink receive level minus this parameter isgreater than the minimum access level offset.Quick Handover Up Trigger Level(dB)During a measurement period, if the filtered uplink level of the serving cell is smaller than thevalue of this parameter, a fast handover is triggered.The level values 0 through 63 map to -110 dBm to -47 dBm.Quick Move Speed Threshold(m/s)

During a measurement period, if the MS moves at a speed greater than the value of thisparameter, a fast handover is triggered.Quick Handover Static Time(0.5s)The fast handover must comply with the P/N criterion. That is, the triggering conditions of fasthandover must be met for N consecutive seconds within P seconds.This parameter corresponds to P of the P/N criterion. That is, if the triggering conditions of fasthandover is met for a period longer than or equal to the value of this parameter, a fast handoveris triggered.The greater the value of this parameter is set, the more difficult the fast-moving handover can betriggered.

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Serving Cell Filter Length MR NumberThis parameter specifies the number of measurement reports used for filtering after the BSCreceives the measurement reports of the serving cell from the BTS. This helps to avoid improperhandover decision based on a single inaccurate measurement report.If this parameter is set to a too great value, the filtered value is more accurate, but the time delayis longer. If this parameter is set to a too small value, the filtered value is inaccurate.[1,20]4Ignore Measurement Report NumberThis parameter specifies the allowed number of invalid measurement reports when the BSC usesthe measurement reports for filtering. If the number of received measurement reports is smallerthan or equal to the value of this parameter, no filtering is performed and no fast handoverdecision is made.This parameter can only be applied to the fast-moving handover