Table 12-16 Load control parameter description Parameter ID Description
BGNSwitch When the parameter is 'OFF', the auto-adaptive background noise update algorithm is switched off. Otherwise, the algorithm is switched on.
BackgroundNoise If [Auto-Adaptive Background Noise Update Switch] is set to OFF, it is used to set background noise of the cell. If [Auto-Adaptive Background Noise Update Switch]
is set to ON, new background noise is restricted by this parameter and
[PARA]BgnAbnormalThd[/PARA]. For detailed information of this parameter, refer to the 3GPP TS 25.133.
BgnAbnormalThd This parameter is applied when [PARA]BGNSwitch[/PARA] is set to ON. (1) If the difference of measured background noise without filtered and the current background noise is larger than the RTWP threshold, the background noise will not be updated. (2) If the difference of new background noise and the configured value is larger than the RTWP threshold, the background noise will not be updated.
BGNAdjustTimeLen Only when the measured background noise's duration reaches this parameter, the output of the auto-adaptive background noise update filter could be regarded as effect background noise, and the current value is replaced with the new one. At the same time, the auto-adaptive status should be restarted; otherwise, the output could not be regarded as the effective background noise.
BgnEndTime This parameter, along with the [Algorithm start time], is used to limit the validation time of the background noise automatic updata algorithm.
BgnStartTime This parameter, along with the [Algorithm stop time], is used to limit the validation time of the background noise automatic updata algorithm.
BgnUpdateThd The difference of RTWP that trigger the update of background noise. If the difference is larger than the threshold, the background will be updated.
NBMCacAlgoSwitch The above values of the algorithms represent the following information:
CRD_ADCTRL: Control NodeB Credit admission control algorithm Only when IUB_CONG_CAC_SWITCH which is set by the SET
CACALGOSWITCH command and this switch are on,the NodeB Credit admission control algorithm is valid.
Issue Error! Unknown Error! Unknown document property 2 Parameter ID Description
HSDPA_UU_ADCTRL: Control HSDPA UU Load admission control algorithm HSDPA_GBP_MEAS: Control HSDPA HS-DSCH Required Power measurement HSDPA_PBR_MEAS: Control HSDPA HS-DSCH Provided Bit Rate
measurement
HSUPA_UU_ADCTRL: Control HSUPA UU Load admission control algorithm MBMS_UU_ADCTRL: Control MBMS UU Load admission control algorithm DOFFC: Default DPCH offset configuration algorithm
HSUPA_PBR_MEAS: Control HSUPA Provided Bit Rate measurement
HSUPA_EDCH_RSEPS_MEAS: Control HSUPA Provided Received Scheduled EDCH Power Share measurement.
EMC_UU_ADCTRL: Control power admission for emergency user FACH_UU_ADCTRL: Control admission for user over FACH channels If CRD_ADCTRL,HSDPA_UU_ADCTRL,HSDPA_GBP_MEAS,
HSDPA_PBR_MEAS, HSUPA_UU_ADCTRL, MBMS_UU_ADCTRL, DOFFC, HSUPA_PBR_MEAS ,HSUPA_EDCH_RSEPS_MEAS, EMC_UU_ADCTRL and FACH_UU_ADCTRL are selected, the corresponding algorithms will be enabled; otherwise, disabled.
NBMLdcAlgoSwitch The algorithms with the above values represent are as follow:
INTRA_FREQUENCY_LDB: Intra-frequency load balance algorithm. It is also named cell breathing algorithm.Based on the cell load, this algorithm changes the pilot power of the cell to control the load between intra-frequency cells.
PUC: Potential user control algorithm. Based on the cell load, this algorithm changes the selection/reselection parameters of a cell to lead the UE to a lighter loaded cell.
UL_UU_OLC: UL UU overload congestion control algorithm. When the cell is overloaded in UL, this algorithm reduces the cell load in UL by quick TF restriction or UE release.
DL_UU_OLC: DL UU overload congestion control algorithm. When the cell is overloaded in DL, this algorithm reduces the cell load in DL by quick TF restriction or UE release.
UL_UU_LDR: UL UU load reshuffling algorithm. When the cell is heavily loaded in UL, this algorithm reduces the cell load in UL by using inter-frequency load handover, BE service rate reduction, uncontrollable real-time service QoS renegotiation, CS inter-RAT handover, and PS inter-RAT handover.
DL_UU_LDR: DL UU load reshuffling algorithm. When the cell is heavily loaded in DL, this algorithm reduces the cell load in DL by using inter-frequency load handover, BE service rate reduction, uncontrollable real-time service QoS renegotiation, CS inter-RAT handover, and PS inter-RAT handover.
OLC_EVENTMEAS: Control OLC event measurement. This algorithm starts the OLC event measurement.
CELL_CODE_LDR: Code reshuffling algorithm. When the cell CODE is heavily loaded, this algorithm reduces the cell CODE load by using BE service rate reduction and code tree reshuffling.
CELL_CREDIT_LDR:Credit reshuffling algorithm. When the cell credit is heavily loaded, this algorithm reduces the credit load of the cell by using BE service rate reduction, uncontrollable real-time service QoS renegotiation, CS inter-RAT handover, and PS inter-RAT handover.
If INTRA_FREQUENCY_LDB, PUC, ULOLC, DLOLC, ULLDR, UDLLDR, OLC_EVENTMEAS, CELL_CODE_LDR and CELL_CREDIT_LDR are selected, the corresponding algorithms will be enabled; otherwise, disabled.
CellLdrSfResThd Cell SF reserved threshold. The code load reshuffling could be triggered only when the minimum available SF of a cell is higher than this threshold. The lower the
Parameter ID Description
code resource LDR trigger threshold is, the easier the downlink code resource enters the initial congestion status, the easier the LDR action is triggered, and the easier the subscriber perception is affected. But a lower code resource LDR trigger threshold causes a higher admission success rate because the resource is reserved.
CellOverrunThd If the cell downlink load exceeds this threshold, the algorithm will decrease the pilot transmit power of the cell so as to increase the whole system's capacity. This parameter is based on network planning. When the cell breathing algorithm is activated, if the value is too small, the physical coverage of the cell is limited so as to avoid cell capacity waste. If the value is too great, the physical coverage is expanded and interference over other cells is increased.
CellUnderrunThd If the cell downlink load is lower than this threshold, the algorithm will increase the pilot transmit power of the cell so as to share load of other cells. This parameter is based on network planning. When the cell breathing algorithm is activated, if the value is too small, the physical coverage of the cell is limited so as to avoid cell capacity waste. If the value is too great, the physical coverage is expanded and interference over other cells is increased.
HsdpaCMPermissionInd CM permission indicator on HSDPA. If this parameter value is TRUE, CM is permitted on HSDPA and HSDPA can be activated with CM activated. If this parameter value is FALSE, H2D is needed before CM activated when HSDPA exists and HSDPA cannot exist when CM is activated.
This switch is compatible with the old HSDPA terminals that might exist in the network because these terminals do not support the activated compressed mode on the HSDPA service.
HsupaCMPermissionInd CM permission indicator on HSUPA.
If this parameter value is Permit, CM is permitted on HSUPA and HSUPA can be activated with CM activation. If this parameter value is Limited, H2D is needed before CM activation when HSUPA exists and HSUPA cannot exist when CM is activated; when the indicator is BasedonUECap, you can infer that the RNC determines whether to configure and activate the compressed mode on the E-DCH and whether to establish an E-DCH in the compressed mode.
This switch is compatible with the HSUPA terminals that might exist in the network because these terminals do not support the activated compressed mode in the E-DCH channel.
CodeBalancingDrdSwit ch
This parameter specifies whether the code balancing DRD algorithm will be applied.
- ON: The code balancing DRD algorithm will be applied.
- OFF: The code balancing DRD algorithm will not be applied.
CodeCongSelInterFreq HoInd
This switch is valid only when the inter-frequency handover switch is enabled.
TRUE means that inter-frequency handover is selected in code resource congestion. FALSE means that inter-frequency handover is not selected in code resource congestion. This parameter should be set based on network resource usage. In the case of multi-frequency coverage, if code resources present a
bottleneck, such as indoor environment, the parameter is recommended to be set to TRUE. When the value is TRUE, users can be selected for inter-frequency
handover during code resource congestion, which can easily release code
congestion and use multi-frequency resources. However, the risk of inter-frequency blink handover increases.
CodeBalancingDrdCode This parameter specifies one of the triggering conditions of code balancing DRD.
Issue Error! Unknown Error! Unknown document property 4 Parameter ID Description
RateThd (The other condition is the minimum spreading factor.) This condition refers to that the code occupancy in the best cell is not lower than the value of this parameter.
DeltaCodeOccupiedRate This parameter specifies the threshold of code occupancy offset between the current cell and the target cell when code balancing DRD is applied. Only when the cell code occupancy offset reaches this threshold can a neighboring cell be selected to be a candidate cell for DRD.
MinForDlBasicMeas DL basic common measurement report cycle. For detailed information of this parameter, refer to 3GPP TS 25.433.
DlBeTraffInitBitrate DL BE traffic Initial bit rate. When DCCC function is enabled, the downlink initial bit rate will be set to this value if the downlink max bit rate is higher than the initial bit rate.
DlCCHLoadRsrvCoeff Different admission policies are used for dedicated channel and common channel users. For common channel users, resources instead of separate power admission decision are reserved. For dedicated channel users, according to the current load factor and the characteristics of the new call, the CAC algorithm predicts the new TX power with the assumption of admitting the new call, then plus with the premeditated common channel DL load factor to get the predicted DL load factor.
Then, compare it with the DL admission threshold. If the value is not higher than the threshold, the call is admitted; otherwise, rejected.
DlCSInterRatShouldBe HOUeNum
Number of users selected in a DL LDR CS domain inter-RAT SHOULDBE load handover. The target subscribers of this parameter are the CS domain subscribers.
Because the CS domain subscribers are session subscribers in general and they have little impact on load, you can set this parameter to a comparatively high value.
DlCSInterRatShouldNot HOUeNum
Number of users selected in a DL LDR CS domain inter-RAT SHOULDNOTBE load handover. The target subscribers of this parameter are the CS domain subscribers. Because the CS domain subscribers are session subscribers in general and they have little impact on load, you can set this parameter to a comparatively high value.
DlHOThd The percentage of the handover service admission threshold to the 100% downlink load. It is applicable to algorithm 1 and algorithm 2. The parameter is used for controlling the handover admission. That is, when a service is handing over to a cell, the RNC evalutates the measurement value of the downlink load after the service is accessed. If the DL load of a cell is higher than this threshold after the access, this service will be rejected. If the DL load of a cell will not be higher than this threshold, this service will be admitted.
The DL load factor thresholds include parameters of [DL threshold of Conv non_AMR service], [DL handover access threshold] and [DL threshold of other services]. The four parameters can be used to limit the proportion between the non-handover service, non-handover user and other services in a specific cell, and to guarantee the access priority of the handover service. This parameter is related to the cell radius and cell maximum TX power. If the value is too high, the system load after admission may be over large, which impacts system stability and leads to system congestion. If the value is too low, the possibility of user rejects may increase, resulting in waste in idle resources.
DlHoCeCodeResvSf Some cell resources can be reserved for handover UEs to guarantee handover success rate and improve access priority of handover services. This parameter
Parameter ID Description
defines the quantity of downlink code and CE resources reserved for handover.
DlInterFreqHoCellLoad SpaceThd
The inter-frequency neighboring cell could be selected as the destination of load handover only when its load remaining space is larger than this threshold. The lower the parameter is, the easier it is to find a qualified target cell for the blind handover. Excessively small value of the parameter, however makes the target cell easily enter the congestion status. The higher the parameter is, the more difficult it is for the inter-frequency blind handover occurs.
DlInterFreqHoBWThd The UE can be selected to process load handover only when its bandwidth is less than this threshold. The higher the parameter is, the higher the service rate of the user in handover is, and the more obviously the cell load is decreased. However, high value of the parameter gives rise to the fluctuation and congestion of the target cell load. The lower the parameter is, the smaller amplitude of the load decreases as a result of the inter-frequency load handover, and the easier it is to maintain the stability of the target cell load.
DlHSUPARsvdFactor Reserved DL power factor for HSUPA user.
DlLdrCreditSfResThd Reserved SF threshold in downlink credit LDR. The downlink credit LDR could be triggered only when the SF factor corresponding to the downlink reserved credit is higher than the uplink or downlink credit SF reserved threshold. The lower the parameter value is, the easier the credit enters the congestion status, the easier the LDR action is triggered, and the easier the user experience is affected. A lower code resource LDR trigger threshold, however, causes a higher admission success rate because the resource is reserved. The parameter should be set based on the operator's requirement.
DlLdrRelThd If the ratio of DL load of the cell to the downlink capacity is lower than this threshold, the DL load reshuffling function of the cell is stopped. After the basic congestion state of the cell load is released, the system no longer implements the LDR action. Because the load fluctuates, the difference between the LDR release threshold and trigger threshold should be higher than 10%. The ping-pong effect of the preliminary congestion state may occur. The lower the LDR trigger and release thresholds are, the easier the system enters the preliminary congestion status, the harder it is released from this status, the easier the LDR action is triggered, and the more likely the users are affected. But, the admission success rate becomes higher since the resources are preserved. The carrier shall make a trade-off between these factors.
DlLdrTrigThd If the ratio of DL load of the cell to the downlink capacity is not lower than this threshold, the DL load reshuffling function of the cell is triggered. After the basic congestion state of the cell load is released, the system no longer implements the LDR action. Because the load fluctuates, the difference between the LDR release threshold and trigger threshold should be higher than 10%. The ping-pong effect of the preliminary congestion state may occur. The lower the LDR trigger and release thresholds are, the easier the system enters the preliminary congestion status, the harder it is released from this status, the easier the LDR action is triggered, and the more likely the users are affected. But, the admission success rate becomes higher since the resources are preserved. The carrier shall make a trade-off between these factors.
DlLdrPsRTQosRenegRa bNum
Number of RABs selected in a DL LDR uncontrolled real-time traffic QoS renegotiation. The target subscribers of this parameter are the PS domain real-time subscribers. The setting of this parameter is analogous to the setting of BE service
Issue Error! Unknown Error! Unknown document property 6 Parameter ID Description
rate reduction subscriber number. Because the number of subscribers performing QoS renegotiation may be smaller than the value of this parameter, for example, the candidate subscribers selected for downlink LDR do not meet the QoS
renegotiation conditions, you must leave some margin when setting this parameter to ensure the success of load reshuffling.
DlLdrAMRRateReducti onRabNum
The mechanism of the LDR is that an action is performed in each [LDR period]
and some services are selected based on the action rules to perform this action.
This parameter defines the maximum number of RABs selected in executing downlink LDR-AMR voice service rate reduction. If the parameter value is too high, the LDR action may fluctuate greatly and over control may occur (the state of basic congestion turns into another extreme--underload). If the parameter value is too low, the LDR action has a slow response and the effect is not apparent, affecting the LDR performance.
DlLdrBERateReduction RabNum
Number of RABs selected in a DL LDR BE traffic rate reduction. In the actual system, this parameter can be set on the basis of the actual circumstances. If the high-rate subscribers occupy a high proportion, set the parameter to a
comparatively low value. If the high-rate subscribers occupy a low proportion, set the parameter to a comparatively high value. Because the basic congestion control algorithm is designed to slowly decrease cell load, you need to set this parameter to a comparatively low value.
LdbDRDLoadRemainT hdDCH
This parameter specifies the downlink load threshold to trigger load balancing DRD for services carried on DCH. The load balancing DRD will probably be triggered only when the downlink cell remanent non H power or remanent R99 equivalent user number is less than this threshold.
LdbDRDLoadRemainT hdHSDPA
This parameter specifies the downlink load threshold to trigger load balancing DRD for services carried on HS-DSCH. The load balancing DRD will probably be triggered only when the downlink cell remanent HSDPA guarantee power or remanent HSDPA user number is less than this threshold.
DlOlcFTFRstrctRabNu m
DL fast TF restriction refers to a situation where, when the cell is overloaded and congested, the downlink TF can be adjusted to restrict the number of blocks transported in each TTI at the MAC layer and the rate of user data, thus reducing the cell downlink load.
The mechanism of the OLC is that an action is performed in each [OLC period]
and some services are selected based on the action rules to perform this action.
This parameter defines the maximum number of RABs selected in executing downlink OLC fast restriction.
Selection of RABs of the OLC is based on the service priorities and ARP values and bearing priority indication. The RAB of low priority is under control. In the
Selection of RABs of the OLC is based on the service priorities and ARP values and bearing priority indication. The RAB of low priority is under control. In the