A configuration command that sets the advanced handover parameters of a cell. In this command, the following parameters uniquely identify the cell:
Cell Index or Cell Name
1. The setting of the handover parameters must be consistent with that of the handover control switch parameters, or the configuration of handover parameters fails. The handover control switch parameters can be set by running the SET CELLHOBASIC command.
2. If you modify the parameter UL Expected Level at HO Access, the parameters UL RX_LEV Upper Threshold and AMR UL RX_LEV Upper Threshold are set to the same value automatically.
| ID | Name | Description |
|---|---|---|
| IDXTYPE | Index Type | Meaning:Index Type Value range:BYIDX(By Index),BYNAME(By Name) Explanation: Index Type. Default value:None |
| CELLIDX | Cell Index | Meaning:Cell Index Value range:0~2047 Explanation: This parameter indicates the source cell index. The source cell index must be unique. Default value:None |
| CELLNAME | Cell Name | Meaning:Cell Name Value range:1-32 characters Explanation: This parameter indicates the name of the source cell. The name of each cell under one BSC must be unique. Default value:None |
| HOCTRLSWITCH | Current HO Control Algorithm | Meaning:Current HO Control Algorithm Value range:HOALGORITHM1(HO Algorithm I),HOALGORITHM2(HO Algorithm II) Explanation:This parameter specifies whether HO Algorithm I or HO Algorithm II is valid. Default value:None |
| SYSFLOWLEV | System Flux Threshold for Load HO | Meaning:System Flux Threshold for Load HO Value range:0,8~11 Explanation: System flux thresholds correspond to the system flux obtained based on message packets, CPU load, and FID queuing load. The system flux level is the current flux control level of the system. 0-11: There are 12 flow control levels. Where, 0 indicates the lowest level and 11 indicates the highest 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 the system. Thus, this parameter should not be set to a higher value. 1) The flow control level algorithm for the assigned system messages: [(Average Message Usage - Inner Flow Control Discard Begin Threshold)/(Inner Flow Control Discard All Threshold - Inner Flow Control Discard Begin Threshold) x 100]/10+1 (round-down for division operation). If the value is smaller than Inner Flow Control Discard Begin Threshold, Level 0 is used. If the value is equal to or greater than Inner Flow Control Discard Begin Threshold, the level is calculated. The value range is from 0 to 11. 2) Flow control threshold for the CPU to start to discard the channel access messages and paging messages: 80% . Flow control threshold for the CPU to discard all channel access messages and paging messages: 100% . CPU usage smaller than 80% corresponds to level 0. CPU usage equal to or greater than CPU flow control threshold 80% corresponds to level 2. An increase of 5% means an increase of 2 levels. Level 10 is the highest. The level value can be 0, 2, 4, 6, 8, and 10. Default value:None |
| TRIGTHRES | Load HO Threshold | Meaning:Load HO Threshold Value range:0~100 Explanation: When 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 this parameter. In other words, the load handover is triggered when the ratio of TCHs occupied in a cell reaches the threshold defined for load handover. Default value:None |
| ACCTHRES | Load Req.on Candidate Cell | Meaning:Load Req.on Candidate Cell Value range:0~100 Explanation: If the cell load is smaller than the value of this parameter, the cell can receive the MSs handed over from other cells. Otherwise, the cell rejects the MSs handed over from other cells. Default value:None |
| LOADOFFSET | Load HO Bandwidth | Meaning:Load HO Bandwidth Value range:0~63 Explanation: The 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_LEV Threshold, 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). Default value:None |
| PERIOD | Load HO Step Period[s] | Meaning:Load HO Step Period[s] Value range:1~255 Explanation: When the load of the cell is equal to or greater than the Load HO Threshold, all the calls served by the cell may send handover requests simultaneously, and the load on the CPU will increase rapidly as a consequence. In some cases, call drops may occur due to traffic congestion in the cell. 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. Default value:None |
| STEP | Load HO Step Level | Meaning:Load HO Step Level Value range:1~63 Explanation: In hierarchical load handover, the handover strip increases by one Load HO Step Level for every Load HO Step Period, starting from the Edge HO DL RX_LEV Threshold. The handovers are performed as such until all the calls whose receive levels are within the range of (Edge HO DL RX_LEV Threshold, Edge HO DL RX_LEV Threshold + Load HO Bandwidth) are handed off the current 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). Default value:None |
| QCKSTATCNT | MS Fast-moving Watch Cells | Meaning:MS Fast-moving Watch Cells Value range:1~10 Explanation: According to the P/N criterion, if the MS fast passes N cells among the P micro cells, the BSC starts to trigger a fast-moving micro-to-macro cell handover. This parameter corresponds to P of the P/N criterion. Default value:None |
| QCKTRUECNT | MS Fast-moving Valid Cells | Meaning:MS Fast-moving Valid Cells Value range:1~10 Explanation: According to the P/N criterion, if the MS fast passes N cells among the P micro cells, the BSC starts to trigger a fast-moving micro-to-macro cell handover. This parameter corresponds to N of the P/N criterion. Default value:None |
| QCKTIMETH | MS Fast-moving Time Threshold[s] | Meaning:MS Fast-moving Time Threshold[s] Value range:0~255 Explanation: The time threshold is calculated based on the cell radius (r) and the velocity (v). The threshold equals 2r/v. If the time taken by an MS to pass a cell is smaller than this threshold, the MS is regarded as moving fast. Otherwise, the MS is regarded as moving slow. Default value:None |
| MAXCNTNUM | MAX Consecutive HO Times | Meaning:MAX Consecutive HO Times Value range:1~20 Explanation: This 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 two handovers are regarded as consecutive handovers. If multiple consecutive intra-cell handovers occur, the intra-cell handover is forbidden for a period. Default value:None |
| BANTIME | Forbidden time after MAX Times[s] | Meaning:Forbidden time after MAX Times[s] Value range:1~200 Explanation: When the number of consecutive intra-cell handovers reaches the maximum allowed, a timer is started to forbid the intra-cell handover. Intra-cell handovers are allowed only when the timer expires. Default value:None |
| CONTINTV | Interval for Consecutive HO Jud.[s] | Meaning:Interval for Consecutive HO Jud.[s] Value range:1~200 Explanation: The two intra-cell handovers that occur during the period specified by this parameter are regarded as consecutive handovers. Default value:None |
| SPEEDPUNISH | Penalty on MS Fast Moving HO | Meaning:Penalty on MS Fast Moving HO Value range:0~63 Explanation: If an MS is moving fast, the BSC performs penalty on the adjacent cells of the cell where the MS is located. This parameter specifies the penalty value. Only when the MS is located at the Umbrella layer and the adjacent cells are located at the Macro, Micro, or Pico layer, penalty is performed. 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. Default value:None |
| SPEEDPUNISHT | Penalty Time on Fast Moving HO[s] | Meaning:Penalty Time on Fast Moving HO[s] Value range:0~255 Explanation: This parameter specifies the period in which penalty is performed on the adjacent cells of the cell where a fast-moving MS is located. The adjacent cells must be located at the Macro, Micro, or Pico layer other than the Umbrella layer. Default value:None |
| UPOPTRSVLEV | UL Expected Level at HO Access | Meaning:UL Expected Level at HO Access Value range:0~63 Explanation: This parameter specifies the expected uplink receive level on a new channel after an MS is handed over to a new cell. This parameter is used for the MS Power Prediction after HO. This parameter should be consistent with the UL RX_LEV Upper Threshold in Huawei II power control algorithm, 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 uplink receive level. The value of this parameter ranges from 0 to 63 (corresponding to -110 dBm to -47 dBm). Default value:None |
| KBIAS | K Bias | Meaning:K Bias Value range:0~63 Explanation: 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 actual downlink receive level of the candidate cells before ranking their downlink receive level based on the K principle. Default value:None |
| TIGHTBCCHRXQUALTHRES | RX_QUAL Threshold for TIGHT BCCH HO | Meaning:RX_QUAL Threshold for TIGHT BCCH HO Value range:0~7 Explanation: This parameter specifies the signal quality threshold of the TIGHT BCCH handover. To trigger an intra-cell TIGHT BCCH handover from a TCH to a BCCH, the downlink receive quality should be lower than the RX_QUAL Threshold for TIGHT BCCH HO. Default value:None |
| TIGHTBCCHHOLOADTHRES | Load Threshold for TIGHT BCCH HO | Meaning:Load Threshold for TIGHT BCCH HO Value range:0~100 Explanation: This parameter specifies the load threshold of the TIGHT BCCH handover. To trigger an intra-cell TIGHT BCCH handover, the load of the non-BCCH frequencies should be higher than the Load Threshold for TIGHT BCCH HO. Default value:None |
| MAXRESEND | Max Resend Times of Phy.Info. | Meaning:Max Resend Times of Phy.Info. Value range:1~255 Explanation: This parameter specifies the maximum number of Physical information retransmissions. Assume that the maximum number is Ny1. If the number of retransmissions exceeds Ny1 before the BTS receives any correct SAMB frame from the MS, the BTS sends the BSC a connection failure message, which can also be a handover failure message. After receiving the message, the BSC releases the newly assigned dedicated channel and stops the timer T3105. During asynchronous handover, the MS constantly sends handover access bursts to the BTS. Usually, the Timer T3124 is set to 320 ms. Upon detecting the bursts, the BTS sends a Physical information message to the MS over the main DCCH/FACCH and sends the MSG_ABIS_HO_DETECT message to the BSC. Meanwhile, the timer T3105 starts. The Physical information containing information about different physical layers guarantees correct MS access. If the timer T3105 expires before the BTS receives the SAMB frame from the MS, the BTS resends the Physical information message to the MS. For details, see GSM Rec. 08.58 and 04.08. Default value:None |
| T3105 | T3105<10ms> | Meaning:T3105<10ms> Value range:0~255 Explanation: This parameter specifies the length of timer T3150. For details, see GSM Rec. 08.58 and 04.08. When the BTS sends physical information to the MS, the BTS starts the timer T3105.If the timer T3105 expires before BTS receives the SAMB frame from MS, BTS resends physical information to MS and restarts the timer T3105. The maximum times for resending physical information is Ny1. Default value:None |
| INTERFEREULEVOFF | ULevOffset for interfere HO[dBm] | Meaning:ULevOffset for interfere HO[dBm] Value range:-30~30 Explanation:The UL receive quality, a factor considered in deciding an interference handover, is derived from the sum of the UL level and the value of this parameter. The default value of this parameter is 0. Default value:None |
| INTERFEREDLEVOFF | DLevOffset for interfere HO[dBm] | Meaning:DLevOffset for interfere HO[dBm] Value range:-30~30 Explanation:The DL receive quality, a factor considered in deciding an interference handover, is derived from the sum of the DL level and the value of this parameter. The default value of this parameter is 0. Default value:None |
| INTERFEREUQUALOFF | UQualOffset for interfere HO[Level] | Meaning:UQualOffset for interfere HO[Level] Value range:-30~30 Explanation:This parameter specifies the range of interference handover, which is a factor considered in deciding an interference handover. The default value of this parameter is 0. Default value:None |
| INTERFEREDQUALOFF | DQualOffset for interfere HO[Level] | Meaning:DQualOffset for interfere HO[Level] Value range:-30~30 Explanation:This parameter specifies the range of interference handover, which is a factor considered in deciding an interference handover. The default value of this parameter is 0. Default value:None |
| OUTSYSLOADHOEN | Inter RAN Load Information Allowed | Meaning:Inter RAN Load Information Allowed Value range:NO(NO),YES(YES) Explanation:This parameter specifies whether to use the information about the load of neighboring 3G cells for load handover decision. Default value:None |
| OUTBSCLOADHOEN | Inter BSC Load Information Allowed | Meaning:Inter BSC Load Information Allowed Value range:NO(NO),YES(YES) Explanation:This parameter specifies whether to use the information about the load of external neighboring 2G cells for load handover decision. Default value:None |
Modify the advanced handover parameters of a cell (Index Type = BYIDX(By Index); Cell Index = 0): SET CELLHOAD: IDXTYPE=BYIDX, CELLIDX=0, HOCTRLSWITCH=HOALGORITHM1, SYSFLOWLEV=10, LOADOFFSET=25, PERIOD=10, STEP=5, QCKSTATCNT=3, QCKTRUECNT=2, QCKTIMETH=15, MAXCNTNUM=3, BANTIME=20, CONTINTV=6, SPEEDPUNISH=30, SPEEDPUNISHT=40, UPOPTRSVLEV=35, KBIAS=0, MAXRESEND=30, T3105=7;