A configuration command that modifies the concentric cell handover parameters of a cell. In this command, the following parameters uniquely identify the cell:
Cell Index or Cell Name
| ID | Name | Description |
|---|---|---|
| IDXTYPE | Index Type | Meaning:Index Type Value range:BYNAME(By Name),BYIDX(By Index) 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 |
| ULTOOLHOALLOW | UL to OL HO Allowed | Meaning:UL to OL HO Allowed Value range:NO(NO),YES(YES) Explanation: This parameter specifies whether the handover from the UL subcell to the OL subcell is enabled. Default value:None |
| OLTOULHOALLOW | OL to UL HO Allowed | Meaning:OL to UL HO Allowed Value range:NO(NO),YES(YES) Explanation: This parameter specifies whether the handover from the OL subcell to the UL subcell is enabled. Default value:None |
| RECLEVUOHOALLOW | RX_LEV for UO HO Allowed | Meaning:RX_LEV for UO HO Allowed Value range:NO(NO),YES(YES) Explanation: This parameter specifies whether the downlink receive level is used as a decisive condition for the concentric cell handover. Default value:None |
| RECQUALUOHOALLOW | RX_QUAL for UO HO Allowed | Meaning:RX_QUAL for UO HO Allowed Value range:NO(NO),YES(YES) Explanation: This parameter specifies whether the downlink receive quality is used as a decisive condition for the concentric cell handover. Default value:None |
| TAFORUOHOALLOW | TA for UO HO Allowed | Meaning:TA for UO HO Allowed Value range:NO(NO),YES(YES) Explanation: This parameter specifies whether the TA is used as a decisive condition for the concentric cell handover. Default value:None |
| SIGAMPTDIFF | UO Signal 0Intensity Difference | Meaning:UO Signal 0Intensity Difference Value range:0~63 Explanation: UO Signal Intensity Difference = UO Amplifier Power Difference + Combiner Insertion Loss Difference + Path Loss Difference of Different Antennas + Pass Loss Difference of Different Frequencies. Measure the receive level of the UL subcell and OL subcell at several different places if the UL subcell and OL subcell use different antennas. The recommended number of places is five. The OL subcell and the UL subcell have different transmit power. Therefore, the receive level of the MS in the UL subcell is different from that in the OL subcell. This parameter specifies the power that should be compensated for the OL subcell. The value of this parameter should be the sum of these items: UO Amplifier Power Difference, Combiner Insertion Loss Difference, Path Loss Difference of Different Antennas, and Pass Loss Difference of Different Frequencies. This value is measured at the site. Multiple-point measurements should be performed when different antennas are used for the OL subcell and UL subcell. If the Enhanced Concentric Allowed parameter is set to Yes, this parameter is invalid. In other words, the power of the OL subcell is not compensated. The level values 0 through 63 map to -110 dBm to -47 dBm. Default value:None |
| RECLEVTHRES | RX_LEV Threshold | Meaning:RX_LEV Threshold Value range:0~63 Explanation: This parameter is one of the parameters that determine the coverage of the OL subcell and UL subcell. When the Enhanced Concentric Allowed parameter is set to No, the coverage of the OL subcell and UL subcell is determined by RX_LEV Threshold, RX_LEV Hysteresis, RX_QUAL Threshold, TA Threshold, and TA Hysteresis. If the Enhanced Concentric Allowed parameter is set to Yes, this parameter is invalid. The RX_LEV Threshold parameter refers to the threshold of the downlink receive level. The level values 0 through 63 map to -110 dBm to -47 dBm. Default value:None |
| RECLEVHYST | RX_LEV Hysteresis | Meaning:RX_LEV Hysteresis Value range:0~63 Explanation: This parameter is one of the parameters that determine the coverage of the OL subcell and UL subcell. When the Enhanced Concentric Allowed parameter is set to No, the coverage of the OL subcell and UL subcell is determined by RX_LEV Threshold, RX_LEV Hysteresis, RX_QUAL Threshold, TA Threshold, and TA Hysteresis. If the Enhanced Concentric Allowed parameter is set to Yes, this parameter is invalid. The level values 0 through 63 map to -110 dBm to -47 dBm. Default value:None |
| RECQUALTH | RX_QUAL Threshold | Meaning:RX_QUAL Threshold Value range:0~70 Explanation: One of the parameters that determine the coverage of the OL subcell and of the UL subcell. RX_QUAL Threshold = RQ (ranging from level 0 to level 7) x 10. If the Enhanced Concentric Allowed parameter is set to No, the coverage of the OL subcell and UL subcell is determined by RX_LEV Threshold, RX_LEV Hysteresis, RX_QUAL Threshold, TA Threshold, and TA Hysteresis. If the Enhanced Concentric Allowed parameter is set to Yes, the coverage of the OL subcell and UL subcell is determined by RX_QUAL Threshold, UtoO HO Received Level Threshold, OtoU HO Received Level Threshold, TA Threshold, and TA Hysteresis. Default value:None |
| TATHRES | TA Threshold | Meaning:TA Threshold Value range:0~255 Explanation: This parameter is one of the parameters that determine the coverage of the OL subcell and UL subcell. If the Enhanced Concentric Allowed parameter is set to No, the coverage of the OL subcell and UL subcell is determined by TA Threshold, RX_LEV Threshold, RX_LEV Hysteresis, RX_QUAL Threshold, and TA Hysteresis. If the Enhanced Concentric Allowed parameter is set to Yes, the coverage of the OL subcell and UL subcell is determined by TA Threshold, UtoO HO Received Level Threshold, OtoU HO Received Level Threshold, RX_QUAL Threshold, and TA Hysteresis. TA threshold must be smaller than TA emergency handover threshold. Default value:None |
| TAHYST | TA Hysteresis | Meaning:TA Hysteresis Value range:0~255 Explanation: This parameter is one of the parameters that determine the coverage of the OL subcell and UL subcell. If the Enhanced Concentric Allowed parameter is set to No, the coverage of the OL subcell and UL subcell is determined by TA Hysteresis, RX_LEV Threshold, RX_LEV Hysteresis, RX_QUAL Threshold, and TA Threshold. If the Enhanced Concentric Allowed parameter is set to Yes, the coverage of the OL subcell and UL subcell is determined by TA Hysteresis, UtoO HO Received Level Threshold, OtoU HO Received Level Threshold, RX_QUAL Threshold, and TA Threshold. Default value:None |
| IUOHOSTATIME | UO HO Watch Time[s] | Meaning:UO HO Watch Time[s] Value range:0~16 Explanation: According to the P/N criterion, if the triggering conditions of concentric cell handover are met for N consecutive seconds within P seconds, a concentric cell handover is triggered. This parameter corresponds to P of the P/N criterion. Default value:None |
| IUOHODURATIME | UO HO Valid Time[s] | Meaning:UO HO Valid Time[s] Value range:0~16 Explanation: According to the P/N criterion, if the triggering conditions of concentric cell handover are met for N consecutive seconds within P seconds, a concentric cell handover is triggered. This parameter corresponds to N of the P/N criterion. Default value:None |
| OPTILAYER | Assign Optimum Layer | Meaning:Assign Optimum Layer Value range:SysOpt(System Optimization),OSubcell(Overlaid Subcell),USubcell(Underlaid Subcell),NoPrefer(No Preference) Explanation: In a concentric cell, the TCH can be assigned in the following modes: System Optimization: Based on the measurement reports sent on the SDCCH, the BSC determines which service layer should be preferentially selected. Underlaid Subcell: The TCH in the UL subcell are preferentially assigned to an MS. Overlaid Subcell: The TCH in the OL subcell are preferentially assigned to an MS. No preference: A channel is assigned according to general channel assignment algorithms. Default value:None |
| OPTILEVTHRES | Assign-optimum-level Threshold | Meaning:Assign-optimum-level Threshold Value range:0~63 Explanation: If the Assign Optimum Layer parameter is set to System Optimization, the current receive level on the SDCCH can be estimated (by interpolating and filtering) based on the uplink measurement value in the measurement reports sent on the SDCCH. Then, the BSC determines whether a TCH in the UL subcell or in the OL subcell should be assigned based on the result of comparing the uplink receive level on the SDCCH and Assign-optimum-level Threshold, and the result of comparing the TA and TA Threshold of Assignment Pref. Only when the uplink receive level on the SDCCH is greater than or equal to Assign-optimum-level Threshold and the TA is lower than TA Threshold of Assignment Pref., a TCH in the OL subcell is preferentially assigned to the MS. Otherwise, a TCH in the UL subcell is preferentially assigned to ensure successful assignment. The level values 0 through 63 map to -110 dBm to -47 dBm. Default value:None |
| OPTITATHRES | TA Threshold of Assignment Pref | Meaning:TA Threshold of Assignment Pref Value range:0~255 Explanation: If the Assign Optimum Layer parameter is set to System Optimization, the current receive level on the SDCCH can be estimated (by interpolating and filtering) based on the uplink measurement value in the measurement reports sent on the SDCCH. Then, the BSC determines whether a TCH in the UL subcell or in the OL subcell should be assigned based on the result of comparing the receive level on the SDCCH and Assign-optimum-level Threshold, and the result of comparing the TA and TA Threshold of Assignment Pref. Only when the receive level on the SDCCH is greater than or equal to Assign-optimum-level Threshold and the TA is lower than TA Threshold of Assignment Pref., a TCH in the OL subcell is preferentially assigned to the MS. Otherwise, a TCH in the UL subcell is preferentially assigned to ensure successful assignment. Default value:None |
| IMMASSTAALLOW | TA Pref. of Imme-Assign Allowed | Meaning:TA Pref. of Imme-Assign Allowed Value range:NO(NO),YES(YES) Explanation: This parameter specifies whether a channel is assigned based on the access_delay in the channel request message during an immediate assignment. If TA Pref. of Imme-Assign Allowed is set to No, a channel in the UL subcell is preferentially assigned during the immediate assignment. If TA Pref. of Imme-Assign Allowed is set to Yes and the access_delay in the channel request message is lower than TA Threshold of Imme-Assign Pref., a channel in the OL subcell is preferentially assigned during the immediate assignment. Otherwise, a channel in the UL subcell is preferentially assigned. Default value:None |
| IMMASSTATHRES | TA Threshold of Imme-Assign Pref | Meaning:TA Threshold of Imme-Assign Pref Value range:0~255 Explanation: If TA Pref. of Imme-Assign Allowed is set to Yes and the access_delay in the channel request message is lower than TA Threshold of Imme-Assign Pref., a channel in the OL subcell is preferentially assigned during the immediate assignment. Otherwise, a channel in the UL subcell is preferentially assigned. Default value:None |
| HOALGOPERMLAY | Pref. Subcell in HO of Intra-BSC | Meaning:Pref. Subcell in HO of Intra-BSC Value range:SysOpt(System Optimization),OSubcell(Overlaid Subcell),USubcell(Underlaid Subcell),NoPrefer(No Preference) Explanation: In a concentric cell, an intra-BSC incoming cell handover request can be processed in one of the following modes: System Optimization: The measurement level on the BCCH of the target cell is added to the intra-BSC inter-cell handover request messages. Then, the BSC compares the measurement value with RX_LEV Threshold, and determines the preferred service layer. During the comparison and determination, the BSC does not take the RX_LEV Hysteresis into consideration. Overlaid Subcell: A channel in the OL subcell is preferentially assigned. Underlaid Subcell: A channel in the UL subcell is preferentially assigned. No Preference: A channel is assigned according to general channel assignment algorithms. Default value:None |
| ACCESSOPTILAY | Incoming-to-BSC HO Optimum Layer | Meaning:Incoming-to-BSC HO Optimum Layer Value range:OSubcell(Overlaid Subcell),USubcell(Underlaid Subcell),NoPrefer(No Preference) Explanation: In a concentric cell, the channel assignment for an incoming-BSC handover can be processed in one of the following modes: Overlaid Subcell: A channel in the OL subcell is preferentially assigned. Underlaid Subcell: A channel in the UL subcell is preferentially assigned. No Preference: A channel is assigned according to general channel assignment algorithms. Default value:None |
| OTOURECEIVETH | OtoU HO Received Level Threshold | Meaning:OtoU HO Received Level Threshold Value range:0~63 Explanation: This parameter is one of the parameters that determine the coverage of the OL subcell and UL subcell of an enhanced concentric cell. If the Enhanced Concentric Allowed parameter is set to Yes, the coverage of the OL subcell and UL subcell is determined by OtoU HO Received Level Threshold, UtoO HO Received Level Threshold, RX_QUAL Threshold, TA Threshold, and TA Hysteresis. The level values 0 through 63 map to -110 dBm to -47 dBm. Default value:None |
| UTOORECTH | UtoO HO Received Level Threshold | Meaning:UtoO HO Received Level Threshold Value range:0~63 Explanation: This parameter is one of the parameters that determine the coverage of the OL subcell and UL subcell of an enhanced concentric cell. If the Enhanced Concentric Allowed parameter is set to Yes, the coverage of the OL subcell and UL subcell is determined by UtoO HO Received Level Threshold, OtoU HO Received Level Threshold, RX_QUAL Threshold, TA Threshold, and TA Hysteresis. The level values 0 through 63 map to -110 dBm to -47 dBm. Default value:None |
| UTOOTRAFHOALLOW | UtoO Traffic HO Allowed | Meaning:UtoO Traffic HO Allowed Value range:NO(NO),YES(YES) Explanation: This parameter determines whether the traffic load in the UL subcell determines the UL subcell to OL subcell handover or the OL subcell to UL subcell handover in an enhanced concentric cell. When this parameter is set to Yes, If the call is in the OL subcell and if the OL to UL HO Allowed parameter is set to Yes, the OL subcell to UL subcell handover is triggered when the traffic load in the UL subcell is lower than En Iuo Out Cell Low Load Threshold. If the call is in the UL subcell and the UL subcell to OL subcell handover is triggered, and if the UL to OL HO Allowed parameter is set to Yes, a timer is started when the traffic load in the UL subcell is greater than En Iuo Out Cell General OverLoad Threshold, thus handing over the MSs in the UL subcell to the OL subcell. If the traffic load in the UL subcell is lower than En Iuo Out Cell General OverLoad Threshold, the related timer is stopped, and the MSs in the UL subcell are not handed over to the OL subcell. When this parameter is set to No, the traffic load in the UL subcell is not taken into account for triggering the UL subcell to OL subcell handover or the OL subcell to UL subcell handover in an enhanced concentric cell. Default value:None |
| UTRAFHOPERIOD | Underlay HO Step Period[s] | Meaning:Underlay HO Step Period[s] Value range:1~255 Explanation: When multiple requests for the UL-to-OL handover are sent simultaneously, calls with lower level may be handed over first. This does not conform to the principle that the call of the best quality should be handed over preferentially. Therefore, the hierarchy handover algorithm is adopted to hand over the calls with higher RX level from the UL subcell to OL subcell. The value of this parameter is the time taken in subtracting Underlay HO Step Level from the signal level of the handover strip. Default value:None |
| UTOOHOPENTIME | Penalty Time of UtoO HO[s] | Meaning:Penalty Time of UtoO HO[s] Value range:0~255 Explanation: If handover penalty is enabled, when a call is handed over from the OL subcell to the UL subcell, it cannot be handed over back to the OL subcell during Penalty Time of UtoO HO to avoid ping-pong handovers. If this parameter is set to 0, handover penalty is not performed on the OL subcell to the UL subcell handover. Default value:None |
| TIMEUTOOFAILPUN | Penalty Time after UtoO HO Fail[s] | Meaning:Penalty Time after UtoO HO Fail[s] Value range:10~255 Explanation: After a UL subcell to OL subcell handover fails, the call cannot be handed over from the UL subcell to the OL subcell during the Penalty Time after UtoO HO Fail. Default value:None |
| TIMEOTOUFAILPUN | Penalty Time after OtoU HO Fail[s] | Meaning:Penalty Time after OtoU HO Fail[s] Value range:0~255 Explanation: After an OL subcell to UL subcell handover fails, the call cannot be handed over from the OL subcell to the UL subcell during the Penalty Time after OtoU HO Fail. Default value:None |
| UTOOFAILMAXTIME | MaxRetry Time after UtoO Fail | Meaning:MaxRetry Time after UtoO Fail Value range:0~8 Explanation: When deciding whether a call can be handed over from the UL subcell to the OL subcell, the BSC determines whether the number of handover failures reaches the MaxRetry Time after UtoO Fail. If the number reaches the MaxRetry Time after UtoO Fail, the UL subcell to OL subcell handover is prohibited during the Penalty Time after UtoO HO Fail. Otherwise, the UL subcell to OL subcell handover is allowed. Default value:None |
| ENLOWLDTHRSH | En Iuo Out Cell Low Load Thred | Meaning:En Iuo Out Cell Low Load Thred Value range:0~100 Explanation: If the channel seizure ratio of the UL subcell is smaller than the value of this parameter, some calls in the OL subcell are handed over to the UL subcell. Default value:None |
| ENGOVERLDTHRSH | En Iuo Out Cell General OverLoad Thred | Meaning:En Iuo Out Cell General OverLoad Thred Value range:0~100 Explanation: If the channel seizure ratio of the UL subcell is greater than the value of this parameter, some calls in the UL subcell are handed over to the OL subcell. Default value:None |
| ENSOVERLDTHRSH | En Iuo Out Cell Serious OverLoad Thred | Meaning:En Iuo Out Cell Serious OverLoad Thred Value range:0~100 Explanation: If the channel seizure ratio of the UL subcell is greater than the value of this parameter, the load handover period from the UL subcell to the OL subcell is decreased by the value of Modified step length of UL load HO period per second on the basis of UL subcell load hierarchical HO period, thus speeding up the load handover from the UL subcell to the OL subcell. Default value:None |
| ENLDHOPRD | Load classification HO Period | Meaning:Load classification HO Period Value range:1~255 Explanation: If the channel seizure ratio of the OL subcell is higher than the En Iuo Out Cell General OverLoad Threshold, all the calls in the cell send handover requests at the same time and the load on the BSC increases in a short time. Thus, congestion may occur in the target cell and call drops may be caused. Through the hierarchical load handover algorithm, the calls in the cell are handed over to the target cell by level. This parameter specifies the period of load handover for each level. Default value:None |
| ENLDHOSTP | Load classification HO Step | Meaning:Load classification HO Step Value range:0~63 Explanation: This parameter specifies the hierarchical level step of the load handover from the UL subcell to the OL subcell. Default value:None |
| RECEIVEQUALTHRSHAMRFR | ReceiveQualThrshAMRFR | Meaning:ReceiveQualThrshAMRFR Value range:0~70 Explanation: This parameter specifies the receive quality threshold of the AMR FR voice service. It is used in concentric cell handover decision. The value of this parameter ranges from 0 to 70, corresponding to RQ (receive quality level 0-7) x 10. Default value:None |
| RECEIVEQUALTHRSHAMRHR | ReceiveQualThrshAMRHR | Meaning:ReceiveQualThrshAMRHR Value range:0~70 Explanation: This parameter specifies the receive quality threshold of the AMR HR voice service. It is used in concentric cell handover decision. The value of this parameter ranges from 0 to 70, corresponding to RQ (receive quality level 0-7) x 10. Default value:None |
| UTRAFHOSTEP | Underlay HO Step Level | Meaning:Underlay HO Step Level Value range:1~63 Explanation: During the handover from the UL subcell to the OL subcell, the calls are hierarchically handled from level 63 to 0. Therefore, the calls with higher receive level can be handed over to the OL subcell first. The handover strip is decreased by Underlay HO Step Level every Underlay HO Step Period. This parameter, together with Underlay HO Step Period, controls the level strip of the handover from the UL subcell to the OL subcell. In other words, the time taken in subtracting Underlay HO Step Level from the handover strip is Underlay HO Step Period. Default value:None |
| ENUTOOLOADINILEV | IniLev for EnUtoO load HO | Meaning:IniLev for EnUtoO load HO Value range:0~63 Explanation:This parameter specifies an initial level for calculating the handover zone of an MS. In an enhanced concentric cell, a handover from the underlaid subcell to the overlaid subcell is performed level by level. Default value:None |
Modify the concentric cell handover parameters of a cell (Index Type = BYIDX(By Index); Cell Index = 0): SET CELLHOIUO: IDXTYPE=BYIDX, CELLIDX=0, HOCTRLSWITCH=HOALGORITHM1, ULTOOLHOALLOW=YES, OLTOULHOALLOW=YES, RECLEVUOHOALLOW=YES, RECQUALUOHOALLOW=NO, TAFORUOHOALLOW=YES, SIGAMPTDIFF=0, RECLEVTHRES=35, RECLEVHYST=5, RECQUALTH=60, TATHRES=63, TAHYST=0, IUOHOSTATIME=5, IUOHODURATIME=4, OPTILAYER=SysOpt, OPTILEVTHRES=35, OPTITATHRES=63, IMMASSTAALLOW=NO, IMMASSTATHRES=0, HOALGOPERMLAY=SysOpt, ACCESSOPTILAY=USubcell, TIMEUTOOFAILPUN=40, TIMEOTOUFAILPUN=10, UTOOFAILMAXTIME=3, ENLOWLDTHRSH=20, ENGOVERLDTHRSH=85, ENSOVERLDTHRSH=90, ENLDHOPRD=5, ENLDHOSTP=5;