Modify Cell PDCCH Algorithm Configuration (MOD CELLPDCCHALGO) CELLPDCCHALGO) Network Element: BTS3900, BTS3900 LTE
Function Use this command to modify the configuration of the PDCCH resource allocation algorithm.
Note This is a high-risk MML command. Pay attention to the following precautions before running this command: Ensure that the antenna weight is valid. Otherwise, it will cause a cell activation failure during the modification of the SplitBeamPdcchSdmaSw::MASSIVE_MIMO_PDCCH_SDMA_SW option.
Parameters ID
Name
Description
LocalCellId
Local cell ID
Meaning: Indicates the Local ID of the cell. It uniquely identifies a cell within a BS. This parameter applies only to LTE FDD and LTE TDD. GUI Value Range: 0~255 Unit: None Actual Value Range: 0~255 MML Default Value: None Recommended Value: None Parameter Relationship: None Service Interrupted After Modification: N/A Impact on Radio Network Performance: None Applicable Mode: L
ComSigCongregLv
SignalCongreg Meaning: Indicates the CCE aggregation level for ateLevel common control signaling. If the HOSuccRateBoostOptSwitch option of the HoSignalingOptSwitch parameter is selected, the PDCCH CCE aggregation level is changed to level 8 when an RAR message for a handover h andover is retransmitted. This parameter applies only to LTE FDD and LTE TDD. GUI Value Range: CONGREG_LV4, CONGREG_LV8 Unit: None Actual Value Range: CONGREG_LV4, CONGREG_LV8 MML Default Value: None Recommended Value: CONGREG_LV4 Parameter Relationship: None Service Interrupted After Modification: No (And no impact on the UE in idle mode) Impact on Radio Network Performance: A smaller value results in lower PDCCH demodulation performance, but it leads to a larger number of UEs that can be scheduled and a lower probability of CCE allocation congestion for common control signaling. A larger value leads to the opposite effects. Applicable Mode: L
CceRatioAdjSwitch
Cce Ratio Adjust Switch
Meaning: Indicates the CCE ratio adjustment switch for the PDCCH. If this switch is turned on, the resource allocation algorithm of the PDCCH dynamically adjusts the UL and DL CCE ratios within each transmission time interval (TTI) based on CCE usages in UL and DL. If this switch is turned off, the UL and DL C CE ratios are not dynamically adjusted. This parameter applies only to LTE FDD and LTE TDD. GUI Value Range: OFF(Off), ON(On)
Unit: None Actual Value Range: OFF, ON MML Default Value: None Recommended Value: ON(On) Parameter Relationship: None Service Interrupted After Modification: No (And no impact on the UE in idle mode) mod e) Impact on Radio Network Performance: If this switch is turned off, the throughput decreases when the uplink and downlink loads are not balanced. If this switch is turned on, the adjusted CCE ratios meet uplink and downlink service requirements, and therefore user experience improves. Applicable Mode: L SfnPdcchDcsThd
SFN Pdcch DCS Threshold
Meaning: Indicates the threshold of isolation for determining whether to enable PDCCH selective transmission in adaptive SFN/SDMA scenarios. For a UE, if the ratio of the RSRP of signals collaboratively received from RRUs providing strong signals to that from RRUs providing weak signals is greater than or equal to this threshold, the eNodeB does not allocate power to RRUs providing weak signals. This parameter applies only to LTE TDD. GUI Value Range: 1~100 Unit: 0.5dB Actual Value Range: 1~50 MML Default Value: None Recommended Value: 40 Parameter Relationship: None
Service Interrupted After Modification: No (And no impact on the UE in idle mode) mod e) Impact on Radio Network Performance: Indicates the threshold of isolation for deciding whether to enable PDCCH selective transmission in adaptive SFN/SDMA scenarios. A larger value of this parameter leads to more interference among SFN cells but higher PDCCH demodulation reliability. A smaller value of this parameter leads to less interference among SFN cells but low PDCCH demodulation reliability. A proper value of this parameter balances the PDCCH interference among SFN cells and the PDCCH demodulation reliability, and therefore improves the PDCCH coverage and capacity in SFN cells. Applicable Mode: L InitPdcchSymNum
PDCCH Initial Meaning: Indicates the number of OFDM symbols Symbol initially occupied by the PDCCH. If the switch for Number dynamic adjustment of the number of OFDM symbols occupied by the PDCCH is turned off, this parameter indicates the number of OFDM symbols that are always occupied by the PDCCH. For LTE TDD cells, this parameter indicates the number of OFDM symbols initially occupied by PDCCH where only the downlink scheduling and controlling information is transmitted in downlink subframes. If the switch for dynamic adjustment of the number of OFDM symbols occupied occup ied by the PDCCH is turned on and the bandwidth is 1.4 MHz or 3 MHz, the PDCCH occupies 4 or 3 OFDM symbols, respectively, and this parameter is invalid. If the switch is turned on and the bandwidth is 5 MHz, 10 MHz, 15 MHz, or 20 MHz, the eNodeB adjusts the number of OFDM symbols in the range of 1, 2, and 3 when this parameter is set to the default value 1, or in the range of 2 and 3 when this parameter is set to 2 or 3. For LTE TDD cells, if the switch is turned on and the bandwidth is 5 MHz, the eNodeB adjusts the number of OFDM symbols in the range of 2 and 3 by default, and this parameter is invalid. If the EMTC_SWITCH option of the EmtcAlgoSwitch parameter in a CellEmtcAlgo MO is selected and the value of this parameter is changed, the value of the startSymbolBR IE is changed, and eMTC UEs that already accessed the cell will be
proactively released. This parameter applies only to LTE FDD and LTE TDD. GUI Value Range: 1~4 Unit: None Actual Value Range: 1~4 MML Default Value: None Recommended Value: If the PdcchSymNumSwitch parameter is set to ON(On) or ECFIADAPTIONON(Enhanced CFI Adaption On), this parameter does not take effect for the bandwi dths of 1.4 MHz and 3 MHz, and the recommended parameter value is 1 for the bandwidths larger than 5 MHz. If the PdcchSymNumSwitch parameter is set to OFF(Off), the recommended value for the bandwidth of 1.4 MHz is 4 and for other bandwidths is 3. In addition, if the PdcchSymNumSwitch parameter is set to OFF(Off) for a small-bandwidth cell, PDCCH resources may be insufficient due to the smaller number of occupied OFDM symbols, and accordingly acco rdingly UEs cannot access the cell. In this scenario, the minimum recommended value for the bandwidth of 1.4 MHz is 3 and for the bandwidths of 3 MHz, 5 MHz, and 10 MHz is 2. Parameter Relationship: None Service Interrupted After Modification: No (And no impact on the UE in idle mode) mod e) Impact on Radio Network Performance: A small value of this parameter increases the possibility that the cell supports dynamic adjustment on the number of OFDM symbols occupied by the PDCCH and increases the downlink throughput in unlimited CCE scenarios. However, the low PDCCH capacity may decrease the downlink throughput in limited CCE scenarios. A large value of this parameter decreases the possibility that the cell supports dynamic adjustment on the number of OFDM symbols occupied by the PDCCH. In addition,
the high PDCCH capacity may decrease the downlink throughput. Applicable Mode: L VirtualLoadPro
PDCCH Virtual Loading Proportion
Meaning: Indicates the percentage of the numbe r of virtually loaded PDCCH CCEs when the PDCC H power control switch is turned off, or indicates the percentage of the power of virtually loaded PDCCH CCEs when the PDCCH power control switch is t urned on. This parameter is used to analyze the impact of the parameter values on PDCCH demodulation performance and provide reference to intra-frequency networking in LTE. This parameter applies only to LTE FDD and LTE TDD. GUI Value Range: 0~100 Unit: % Actual Value Range: 0~100 MML Default Value: None Recommended Value: 0 Parameter Relationship: None Service Interrupted After Modification: No (And no impact on the UE in idle mode) mod e) Impact on Radio Network Performance: A larger value results in higher interference to the PDCCH from neighboring cells. A smaller value leads to lower interference. Applicable Mode: L
PdcchInitialCceAdju PDCCH Initial Meaning: Indicates the PDCCH initial aggregation stValue Cce level adjustment. This parameter applies only to LTE Adjustment FDD. Value GUI Value Range: -10~5 Unit: None
Actual Value Range: -10~5 MML Default Value: None Recommended Value: 0 for heavily loaded networks Parameter Relationship: None Service Interrupted After Modification: No (And no impact on the UE in idle mode) mod e) Impact on Radio Network Performance: A smaller parameter value leads to a higher PDCCH aggregation level, better coverage performance, and smaller capacity. A larger parameter value results in the opposite effects. Applicable Mode: L PdcchSymNumSwit ch
PDCCH Symbol Number Adjust Switch
Meaning: Indicates whether to enable dynamic adjustment on the number of orthogonal frequenc y division multiplexing (OFDM) symbols occupied by the physical downlink control channel (PDCCH). If this parameter is set to OFF(Off), OFF(Off), the number of OFDM symbols occupied by the PDCCH is fixed and cannot be dynamically adjusted. If this parameter is set to ON(On), the number of OFDM symbols occupied b y the PDCCH is dynamically adjusted based on the required number of PDCCH control channel elements (CCEs). The OFDM symbol adjustment range can be determined by referring to the MML reference of the InitPdcchSymNum parameter. If this parameter is set to ECFIADAPTIONON(Enhanced CFI Adaption On), the number of OFDM symbols occupied by the PDCCH is dynamically adjusted based on the cell downlink do wnlink throughput, and the adjustment performance is the best among the three methods. The OFDM symbol adjustment range can be determined by b y referring to the MML reference of the InitPdcchSymNum parameter. If the EMTC_SWITCH option of the EmtcAlgoSwitch parameter in a CellEmtcAlgo MO is selected and the value of this parameter is changed, the value v alue of the startSymbolBR IE is changed, and eMTC UEs that already accessed the cell will be proactively p roactively released.
This parameter applies only to LTE FDD and LTE TDD. GUI Value Range: OFF(Off), ON(On), ECFIADAPTIONON(Enhanced CFI Adaption On) Unit: None Actual Value Range: OFF, ON, ECFIADAPTIONON MML Default Value: None Recommended Value: ECFIADAPTIONON(Enhanced CFI Adaption On) Parameter Relationship: None Service Interrupted After Modification: No (And no impact on the UE in idle mode) mod e) Impact on Radio Network Performance: If this parameter is set to OFF, the number of OFDM symbols occupied by the PDCCH is fixed and cannot be dynamically adjusted. If this parameter is set to ON, the number of OFDM symbols occupied by the PDCCH is dynamically adjusted based on the number of required CCEs, and therefore cell downlink throughput increases. If this parameter is set to ECFIADAPTIONON, the dynamic adjustment of the number of OFDM symbols occupied by the PDCCH considers cell downlink throughput, and therefore can reach higher throughput when downlink frequency selective scheduling is enabled. Applicable Mode: L CceUseRatio
CCE use ratio
Meaning: Indicates the upper limit limit of the CCE usage within each transmission time interval (TTI). When the PdcchSymNumSwitch parameter in the CellPdcchAlgo MO is set to ON(On), the parameter setting is invalid, that is, the CCE usage cannot be limited within each TTI. This parameter applies only to LTE TDD. GUI Value Range: 1~100
Unit: % Actual Value Range: 1~100 MML Default Value: None Recommended Value: If the value of this parameter p arameter is relatively small, the PDCCH has insufficient CCE resources, which will affect the access success rate of cell edge UEs (CEUs), handover success rate, CCE assignment success rate for DL scheduling, and especially that for UL scheduling. Therefore, at least 24 available CCEs are required within each TTI. The lower limits for the CCE usage within each TTI are described as follows for cells with different configurations(If the actual CCE usage within each TTI is less than the specified lower limits for the CCE usage within each TTI, access success rate of CEUs and handover success rate are affected): (1) If the cell bandwidth and the number of PDCCH symbols are 10 MHz and 1, respectively, the lower limit is 100 when the eNodeB uses either two or four physical antenna ports; (2) If the cell bandwidth and the number of PDCCH symbols are 10 MHz and 2, respectively, the lower limit is 100 when the eNodeB uses either two or four physical antenna ports; (3) If the cell bandwidth and the number of PDCCH symbols are 10 MHz and 3, respectively, the lower limit is 65 when the eNodeB uses four ph ysical antenna ports and is 58 when the eNodeB uses two physical antenna ports; (4) If the cell bandwidth and the number of PDCCH symbols are 15 MHz and 1, respectively, the lower limit is 100 when the eNodeB uses either two or four physical antenna ports; (5) If the cell bandwidth and the number of PDCCH symbols are 15 MHz and 2, respectively, the lower limit is 80 when the eNodeB uses four ph ysical antenna
ports and is 63 when the eNodeB uses two physical antenna ports; (6) If the cell bandwidth and the number of PDCCH symbols are 15 MHz and 3, respectively, the lower limit is 44 when the eNodeB uses four ph ysical antenna ports and is 38 when the eNodeB uses two physical antenna ports; (7) If the cell bandwidth and the number of PDCCH symbols are 20 MHz and 1, respectively, the lower limit is 100 when the eNodeB uses either two or four physical antenna ports; (8) If the cell bandwidth and the number of PDCCH symbols are 20 MHz and 2, respectively, the lower limit is 60 when the eNodeB uses four ph ysical antenna ports and is 50 when the eNodeB uses two physical antenna ports; (9) If the cell bandwidth and the number of PDCCH symbols are 20 MHz and 3, respectively, the lower limit is 32 when the eNodeB uses four ph ysical antenna ports and is 28 when the eNodeB uses two physical antenna ports; If multi-user MIMO (MU-MIMO) and multi-user beamforming (MUBF) are enabled, you are advised not to apply restrictions on the CCE usage within each TTI. The purpose is to ensure successful CCE assignment for paired UEs and maintain the MU-MIMO and MUBF performance. Parameter Relationship: None Service Interrupted After Modification: No (And no impact on the UE in idle mode) mod e) Impact on Radio Network Performance: If dynamic adjustment on the number of PDCCH OFDM symbols s ymbols is disabled and this parameter is set too small, the number of available CCEs is small, resulting in low access and handover success rates and a low CCE assignment success rate for uplink and downlink scheduling per TTI for cell edge users (CEUs).
If the adjustment is disabled and this parameter is set too large, CCE waste occurs when the load is low. Applicable Mode: L PdcchAggLvlCLAdj PDCCH ustSwitch Aggregation Level CL Switch
Meaning: Indicates the switch used to enable o r disable closed-loop adjustment to the PDCCH aggregation level. If this switch is turned on, PDCCH aggregation level is adjusted based on the block error rate (BLER) of the PDCCH. If this switch is turned off, PDCCH aggregation level is not adjusted based on the BLER of the PDCCH. This parameter applies only to LTE FDD and LTE TDD. GUI Value Range: OFF(Off), ON(On) Unit: None Actual Value Range: OFF, ON MML Default Value: None Recommended Value: ON(On) Parameter Relationship: None Service Interrupted After Modification: No (And no impact on the UE in idle mode) mod e) Impact on Radio Network Performance: If this switch is turned on, the BLER converges on the target value and the uplink and downlink throughput increases. If this switch is turned off, the PDCCH demodulation performance deteriorates and the uplink and downlink throughput decreases. Applicable Mode: L
DPDVirtualLoadSwi DPD Virtual tch Load Switch
Meaning: Indicates whether to enable virtual loading for digital predistortion (DPD). This parameter applies only to LTE TDD. GUI Value Range: OFF(Off), ON(On) Unit: None
Actual Value Range: OFF, ON MML Default Value: None Recommended Value: OFF(Off) Parameter Relationship: None Service Interrupted After Modification: No (And no impact on the UE in idle mode) mod e) Impact on Radio Network Performance: This parameter is used to optimize the method of creating a DPD model, meet the requirement for DPD dynamic performance, reduce scenario restrictions, and mitigate the interference (which is caused by shortened guard intervals) to other base stations. Applicable Mode: L DPDVirtualLoadTy pe
DPD Virtual Load Type
Meaning: Indicates the virtual loading type for digital predistortion (DPD). This parameter applies only to LTE TDD. GUI Value Range: AVERAGE(AVERAGE), MINUS_3DB_FIXED(MINUS_3DB_FIXED), MINUS_6DB_FIXED(MINUS_6DB_FIXED) Unit: None Actual Value Range: AVERAGE, MINUS_3DB_FIXED, MINUS_6DB_FIXED MML Default Value: None Recommended Value: AVERAGE(AVERAGE) Parameter Relationship: None Service Interrupted After Modification: No (And no impact on the UE in idle mode) mod e) Impact on Radio Network Performance: This parameter is used to provide multiple data choices for creating a
DPD model and help reduce the adjacent channel power ratio (ACPR) of an RF channel. Applicable Mode: L AggLvlSelStrageFor Aggregation DualCW Level Strategy for Dual Codewords
Meaning: Indicates the policy for control channel element (CCE) aggregation level selection of the physical downlink control channel (PDCCH) in dualcodeword scenarios. In capacity-based CCE aggregation level selection of the PDCCH, set this parameter to the default value STRATEGYBASEDONCAPACITY. In this situation, the average CCE aggregation level of the PDCCH in dual-codeword scenarios decreases, and more UEs can be supported on the PDCCH. In coverage-based CCE aggregation level selection of the PDCCH, set this parameter to STRATEGYBASEDONCOVERAGE. In this situation, both the average CCE aggregation level of the PDCCH in dual-codeword scenarios and cell coverage performance increase. This parameter applies only to LTE FDD. GUI Value Range: STRATEGYBASEDONCAPACITY(Capacity-based Selection Strategy), STRATEGYBASEDONCOVERAGE(Coverage-based Selection Strategy) Unit: None Actual Value Range: STRATEGYBASEDONCAPACITY, STRATEGYBASEDONCOVERAGE MML Default Value: None Recommended Value: STRATEGYBASEDONCAPACITY(Capacity-based Selection Strategy) Parameter Relationship: None Service Interrupted After Modification: No (And no impact on the UE in idle mode) mod e)
Impact on Radio Network Performance: In the scenario of dual codewords, if this parameter is set to STRATEGYBASEDONCAPACITY, the average CCE aggregation level of the PDCCH decreases, and more UEs can be supported in the PDCCH, but the PDCCH block error rate (BLER) of severe noise-afflicted noise-afflicted UEs increases. In this situation, the PDCCH BLER cannot converge on the target value even when closed-loop adjustment on the CCE aggregation level of the PDCCH is enabled. If this parameter is set to STRATEGYBASEDONCOVERAGE, both the average CCE aggregation level of the PDCCH and the demodulation performance in the PDCCH increase, but fewer UEs can be supported in the PDCCH. Applicable Mode: L PdcchCapacityImpro PDCCH veSwitch Capacity Improve Switch
Meaning: Indicates whether to enable optimization on PDCCH capacity expansion. For LTE FDD n etworks, if this parameter is set to ON(On), (1) the initial value for closed-loop adjustment on PDCCH aggregation level applies only to SRBs; (2) if a UE fails to be allocated with CCEs, the eNodeB reallocates CCEs to the UE by increasing the PDCCH power and decreasing the PDCCH aggregation level for the UE. If this parameter is set to OFF(Off), (1) the initial value for closed-loop adjustment on PDCCH aggregation level applies to both SRBs and DRBs; (2) if a UE fails to be allocated with CCEs, the eNodeB does not reallocate CCEs to the UE by increasing the PDCCH power and decreasing the PDCCH aggregation level for the UE. For LTE TDD networks, if this parameter is set to ON(On), the eNodeB reallocates CCEs to a UE, if the UE fails to be allocated with CCEs, by increasing the PDCCH transmit power and decreasing the PDCCH aggregation level for the UE. If this parameter is set to OFF(Off), the eNodeB does not reallocate CCEs to a UE, if the UE fails to be allocated with CCEs, by increasing the PDCCH power and decreasing the PDCCH aggregation level for the UE. This parameter applies only to LTE FDD and LTE TDD. GUI Value Range: OFF(Off), ON(On) Unit: None
Actual Value Range: OFF, ON MML Default Value: None Recommended Value: ON(On) Parameter Relationship: None Service Interrupted After Modification: No (And no impact on the UE in idle mode) mod e) Impact on Radio Network Performance: When this parameter is set to ON in an FDD network, the initial value for closed-loop adjustment on PDCCH aggregation level decreases, the PDCCH capacity and CCE allocation success rate increase, and therefore cell throughput also increases. When this parameter is set to ON in a TDD network, the CCE allocation success rate increases, and therefore cell throughput also increases. Applicable Mode: L PdcchMaxCodeRate PDCCH Max Code Rate
Meaning: Indicates the maximum coding rate on the PDCCH. The coding rate on the PDCCH cannot exceed this parameter value. Otherwise the PDCCH aggregation level must be increase. This parameter applies only to LTE FDD and LTE TDD. GUI Value Range: 75~120 Unit: None Actual Value Range: 0.75~1.2, step:0.01 MML Default Value: None Recommended Value: 75 Parameter Relationship: None Service Interrupted After Modification: No (And no impact on the UE in idle mode) mod e) Impact on Radio Network Performance: If this parameter is set to a smaller value, the maximum coding rate on the PDCCH is smaller, and the PDCCH
aggregation level will be higher. In this case, the PDCCH coverage is better, but the system s ystem capacity is smaller. A larger value of this parameter results in the opposite effects. Applicable Mode: L ULDLPdcchSymNu Uplink and m Downlink PDCCH Symbols Configuration
Meaning: Indicates the number of OFDM symbols initially occupied by the PDCCH where the downlink subframe indicating the uplink and downlink scheduling and controlling information is transmitted. If the PDCCH Symbol Number Adjust Switch parameter is set to OFF, this parameter indicates the number of OFDM symbols occupied by the PDCCH where the downlink subframe indicating the uplink and downlink scheduling and controlling information is transmitted. For downlink subframes indicating both uplink and downlink scheduling and controlling information, if the PDCCH Symbol Number Adjust Switch parameter is set to ON, the number of OFDM symbols s ymbols occupied by the PDCCH is as follows: On the bandwidth of 5 MHz, the PDCCH occupies 2 or 3 OFDM symbols. (In this case, the configuration of this parameter is invalid.) On the bandwidth of 10 MHz, 15 MHz, or 20 MHz, the PDCCH occupies 1, 2, or 3 OFDM symbols when this parameter is set to 1, and the PDCCH occupies 2 or 3 OFDM symbols when this parameter is set to 2 or 3. If the EMTC_SWITCH option of the EmtcAlgoSwitch parameter in a CellEmtcAlgo MO is selected and the value of this parameter is changed, the value v alue of the startSymbolBR IE is changed, and eMTC UEs that already accessed the cell will be proactively p roactively released. This parameter applies only to LTE TDD.When the PhichDuration parameter in the PHICHCfg MO is set to EXTENDED and the cell bandwidth is not 1.4 MHz, this parameter must be set to 3(3) according to 3GPP specifications. Therefore, value 3(3) takes effect automatically even if this parameter is set to another value. GUI Value Range: 1(1), 2(2), 3(3) Unit: None Actual Value Range: 1, 2, 3
MML Default Value: None Recommended Value: If the PDCCH Symbol S ymbol Number Adjust Switch parameter is set to OFF, you are advised to set this parameter to 3. If the PDCCH Symbol Number Adjust Switch parameter is set to ON, you are advised to set this parameter to 1. Parameter Relationship: None Service Interrupted After Modification: No (And no impact on the UE in idle mode) mod e) Impact on Radio Network Performance: For downlink subframes in which both uplink and downlink scheduling and controlling information is transmitted, a small value of this parameter increases the possibility that the cell supports dynamic adjustment on the number of OFDM symbols occupied by the PDCCH and increases the downlink throughput in unlimited CCE scenarios. However, the low PDCCH capacity may decrease the downlink throughput in limited CCE scenarios. A large value of this parameter decreases the possibility that the cell supports dynamic dynamic adjustment on the number of OFDM symbols occupied by the PDCCH. In addition, the high PDCCH capacity may decrease the downlink throughput. Applicable Mode: L PDCCHAggLvlAda ptStrage
The Strategy Of PDCCH Aggregation Level Adaptation
Meaning: Indicates the adaptive strategy of the PDCC H aggregation level. The STRATEGYBASEDONCOVERAGE check box is selected for this parameter by default. In this case, a higher aggregation level is applied, and therefore the cell that the control channel serves has better coverage. However, the number of scheduling UEs carried ca rried by the control channel decreases. If the STRATEGYBASEDONCAPACITY check box is selected, a lower aggregation level is applied, and the control channel carries more scheduling UEs. This parameter applies only to LTE TDD.
GUI Value Range: STRATEGYBASEDONCOVERAGE(Coverage-based Selection Strategy), STRATEGYBASEDONCAPACITY(Capacity-based Selection Strategy) Unit: None Actual Value Range: STRATEGYBASEDONCOVERAGE, STRATEGYBASEDONCAPACITY MML Default Value: None Recommended Value: STRATEGYBASEDONCOVERAGE(Coverage-based Selection Strategy) Parameter Relationship: None Service Interrupted After Modification: No (And no impact on the UE in idle mode) Impact on Radio Network Performance: If the STRATEGYBASEDONCOVERAGE check box is selected, the PDCCH aggregation level rises and t he demodulation performance is improved, while the number of scheduling UEs supported by the PDCCH decreases. If the STRATEGYBASEDONCAPACITY check box is selected, the PDCCH aggregation level is decreased and more scheduling UEs can be supported by the PDCCH. However, some severely interfered UEs may have more PDCCH bit errors. Applicable Mode: L HysForCfiBasedPre Sch
Hysteresis for CFI increase based on PreSch
Meaning: Indicates the hysteresis of control format indicator (CFI) number increase caused by uplink preallocation failures when the PdcchSymNumSwitch parameter is set to ECFIADAPTIONON. If If the HysForCfiBasedPreSch parameter is set to 0, preallocation failures do not trigger CFI number increase. This parameter applies only to LTE FDD and LTE TDD.
GUI Value Range: 0~1 Unit: None Actual Value Range: 0~1 MML Default Value: None Recommended Value: 1 Parameter Relationship: None Service Interrupted After Modification: No (And no impact on the UE in idle mode) mod e) Impact on Radio Network Performance: Setting this parameter to 1 results in a higher probability of successful control channel element (CCE) allocation during preallocation, more UEs that are selected in preallocation, a shorter delay of both uplink and downlink scheduling, but a larger increase in the downlink CFI number. As a result, the MCS index decreases in downlink scheduling and downlink throughput decreases when the downlink traffic is heavy. Setting this parameter to 0 results in the opposite effects. Applicable Mode: L SfnPdcchSdmaThd
SFN PDCCH SDMA Threshold
Meaning: Indicates the threshold of isolation for determining whether to enable PDCCH SDMA in adaptive SFN/SDMA scenarios. For a UE, if the ratio between the RSRP of RRUs with strong signals and that of RRUs with weak signals in an SFN cell is equal to or greater than the value of this parameter, the UE only use resources of RRUs with strong signals while RRUs with weak signals can be reused by b y other UEs. This parameter applies only to LTE FDD and LTE TDD. GUI Value Range: 0~100 Unit: 0.5dB Actual Value Range: 0~50
MML Default Value: None Recommended Value: 24 Parameter Relationship: None Service Interrupted After Modification: No (And no impact on the UE in idle mode) mod e) Impact on Radio Network Performance: Indicates the threshold of isolation for determining whether to enable PDCCH SDMA in adaptive SFN/SDMA scenarios.If this parameter is set to a large value, the PDCCH average aggregation level is low and the PDCCH spatial multiplexing percentage is also low. If this parameter is set to a small value, the PDCCH average aggregation level is high and the PDCCH spatial multiplexing percentage is also high. This parameter must be set properly to guarantee a balance between PDCCH overhead and RRU resource reuse percentage so that the PDCCH capacity can be improved in SFN cells. Applicable Mode: L UlPdcchAllocImpro veSwitch
UL PDCCH Meaning: Indicates whether to enable the mechanism of Alloc Improve increasing the control channel element (CCE) resource Switch allocation success rate in the uplink. ReserveCommonCCESwitch: Indicates whether to reserve CCE resources in the common search space for the uplink. CCE resources in the common search space are reserved for the uplink only when this switch is on. This parameter applies only to LTE FDD and LTE TDD. GUI Value Range: ReserveCommonCCESwitch(ReserveCommonCCESwi tch) Unit: None Actual Value Range: ReserveCommonCCESwitch
MML Default Value: None Recommended Value: ReserveCommonCCESwitch:Off Parameter Relationship: None Service Interrupted After Modification: No (And no impact on the UE in idle mode) mod e) Impact on Radio Network Performance: ReserveCommonCCESwitch: If this switch is on, CCE resources in common search space are reserved for the uplink during CCE resource allocation, which increases the CCE allocation success rate in the uplink when the CCE resources in the uplink are insufficient. Therefore, the access success rate, network capacity for VoIP services, and uplink throughput increase, but the scheduling delay for some UEs in the downlink d ownlink prolongs. If this switch is off, off, CCE resource allocation in the uplink is not affected. Applicable Mode: L CceMaxInitialRatio
CCE Max Initial Ratio
Meaning: Indicates the maximum ratio of the uplink and downlink initial CCEs on the PDCCH. If this parameter is set to 1_2, the maximum uplink-downlink initial CCE ratio is 1:2. If this parameter is set to a value greater than 1_2, the maximum uplink-downlink initial CCE ratio can be dynamically changed to any value ranging from 1_2 to the configured value based on the load in the uplink and downlink. If subframe configuration 2 is adopted for a TDD cell, it is recommended that the SubframeSchDiffSwitch check box be selected to ensure the PRB usage on subframes 3 and 8. This parameter applies only to LTE FDD and LTE TDD. GUI Value Range: 1_2(1:2), 1_1(1:1), 2_1(2:1), 3_1(3:1), 4_1(4:1), 5_1(5:1), 6_1(6:1), 7_1(7:1), 8_1(8:1), 9_1(9:1), 10_1(10:1) Unit: None
Actual Value Range: 1_2, 1_1, 2_1, 3_1, 4_1, 5_1, 6_1, 7_1, 8_1, 9_1, 10_1 MML Default Value: None Recommended Value: 1_2(1:2) Parameter Relationship: None Service Interrupted After Modification: No (And no impact on the UE in idle mode) mod e) Impact on Radio Network Performance: If this parameter is set to 1_2, the uplink service experience is poor when the uplink load is heavy and the downlink load is light. If this parameter is set to a value greater than 1_ 2, the uplink service experience improves but the PRB usage of some subframes slightly decreases when the uplink load is heavy and the downlink load is light. Applicable Mode: L PdcchPowerEnhance PDCCH dSwitch Power Enhanced Switch
Meaning: Indicates whether to enable enhanced PDCCH power control. If this switch is turned on, the eNodeB selects appropriate PDCCH transmit power based on channel quality to increase PDCCH capacity. This parameter applies only to LTE FDD and LTE TDD massive MIMO cells for which the policy of selecting the aggregation level based on coverage is adopted. GUI Value Range: OFF(Off), ON(On) Unit: None Actual Value Range: OFF, ON MML Default Value: None Recommended Value: OFF(Off) Parameter Relationship: None
Service Interrupted After Modification: No (And no impact on the UE in idle mode) mod e) Impact on Radio Network Performance: If this switch is turned on, the eNodeB selects a lower aggregation level and increases the transmit power to ensure the PDCCH demodulation performance, allow the PDCCH to support more UEs, and increase the uplink and downlink throughput. If this switch is turned off, the eNodeB selects a hi gher aggregation level and the operator needs to configure the transmit power manually. This results in the opposite effects. Applicable Mode: L PdcchBlerTarget
PDCCH BLER Target
Meaning: Indicates the target BLER in PDCCH link adaptation. The PDCCH BLER must converge on this target BLER. This parameter applies only to LTE FDD and LTE TDD. GUI Value Range: 0~1000 Unit: None Actual Value Range: 0~1, step:0.001 MML Default Value: None Recommended Value: For FDD: 15. Do not change this value unless necessary. For TDD: 5; 15 if the PDCCH is heavily loaded Parameter Relationship: None Service Interrupted After Modification: N/A Impact on Radio Network Performance: A smaller value of this parameter results in a lower PDCCH BLER. A larger value of this parameter results in the opposite effect. A high BLER reduces uplink and downlink throughput. A low BLER increases PDCCH resource consumption, reducing the system capacity and number of UEs that can be scheduled.
Applicable Mode: L HLNetAccSigAggL vlSelEnhSw
HL Net Access Signal Aggregation Lvl Select Enhance Switch
Meaning: Indicates whether to enable enhanced aggregation level selection of access signaling on high load networks. If this parameter is set to ON(On), the eNodeB accurately estimates the channel conditions when a UE accesses a high load network where PDCCH resources are insufficient, and selects a PDCCH aggregation level for the UE that better matches the UE's actual signal quality. It is recommended that this parameter be set to ON(On) and the PuschDtxSchOptSwitch option of the UlSchSwitch parameter in the CellAlgoSwitch MO be selected. If this parameter is set to OFF(Off), the eNodeB selects a high aggregation level for all access signaling to ensure the PDCCH reliability. This parameter applies only to LTE FDD and LTE TDD. GUI Value Range: OFF(Off), ON(On) Unit: None Actual Value Range: OFF, ON MML Default Value: None Recommended Value: OFF(Off) Parameter Relationship: None Service Interrupted After Modification: No (And no impact on the UE in idle mode) mod e) Impact on Radio Network Performance: If this parameter is set to ON, the selected PDCCH aggregation level better matches the actual signal quality of the UE that accesses the high load network where PDCCH resources are insufficient. This prevents PDCCH resource exhaustion and improves the PDCCH capacity and cell throughput on high load networks. However, PDCCH bit errors may increase for UEs experiencing strong interference, which increases the access delay of these UEs and may reduce the E-RAB setup success rate.
If this parameter is set to OFF, the high aggregation level selected for the access signaling ensures the PDCCH reliability. However, PDCCH resources may be insufficient on high load networks, which reduces the number of scheduled UEs supported by the PDCCH and the cell throughput. Applicable Mode: L EpdcchAlgoSwitch
EPDCCH Algorithm Switch
Meaning: Indicates whether to enable algorithms related to the EPDCCH. EpdcchFunctionSwitch: Indicates whether to support EPDCCH. If this option is selected, EPDCCH is supported. This option applies only to LTE FDD and LTE TDD. GUI Value Range: EpdcchFunctionSwitch(EpdcchFunctionSwitch) Unit: None Actual Value Range: EpdcchFunctionSwitch MML Default Value: None Recommended Value: EpdcchFunctionSwitch:Off Parameter Relationship: None Service Interrupted After Modification: No (And no impact on the UE in idle mode) mod e) Impact on Radio Network Performance: EpdcchFunctionSwitch: If this option is selected, the eNodeB configures EPDCCH resources for newly accessed UEs when the PDCCH resources are insufficient and RB resources are not used up. In this way, both uplink and downlink do wnlink RB usages increase. If this option is deselected, the eNodeB does not configure EPDCCH resources for newly accessed UEs when the PDCCH resources are insufficient and RB resources are not used up. As a result, both uplink and downlink RBs cannot be fully utilized. Applicable Mode: L
CceThdtoEnableEpd CCE Usage cch Threshold To
Meaning: Indicates the CCE usage threshold for configuring the EPDCCH. If the CCE usage is greater
Enable EPDCCH
than this parameter value, the eNodeB configures EPDCCH resources for newly accessed UEs. This parameter applies only to LTE FDD and LTE TDD. GUI Value Range: 0~100 Unit: None Actual Value Range: 0~100 MML Default Value: None Recommended Value: 80 Parameter Relationship: -Configuration constraints: In a CellPdcchAlgo MO, the value of CceThdtoEnableEpdcch must be larger than CceThdtoDisableEpdcch. Service Interrupted After Modification: No (And no impact on the UE in idle mode) mod e) Impact on Radio Network Performance: A greater value of this parameter results in a lower probability of configuring the EPDCCH. As a result, RB resources cannot be fully utilized, and the network throughput decreases. A smaller value of this parameter results in a higher probability of configuring the EPDCCH, which wastes RB resources and decreases the network throughput. Applicable Mode: L
RbThdtoEnableEpdc RB Usage ch Threshold To Enable EPDCCH
Meaning: Indicates the downlink RB usage threshold for configuring EPDCCH. If the downlink RB usage is less than this parameter value, the eNodeB con figures EPDCCH resources for newly accessed UEs. This parameter applies only to LTE FDD and LTE TDD. GUI Value Range: 0~100
Unit: None Actual Value Range: 0~100 MML Default Value: None Recommended Value: 60 Parameter Relationship: -Configuration constraints: In a CellPdcchAlgo MO, the value of RbThdtoEnableEpdcch must be smaller than RbThdtoDisableEpdcch. Service Interrupted After Modification: No (And no impact on the UE in idle mode) mod e) Impact on Radio Network Performance: A larger v alue of this parameter results in a higher probability of configuring the EPDCCH, fewer available RBs after the EPDCCH is configured, and a smaller downlink throughput gain. A smaller value of this parameter results in the opposite effects. Applicable Mode: L CceThdtoDisableEp dcch
CCE Usage Threshold To Disable EPDCCH
Meaning: Indicates the CCE usage threshold for disabling EPDCCH. If the CCE usage is lower than this parameter value, the eNodeB disables the EPDCCH. This parameter applies only to LTE FDD and LTE TDD. GUI Value Range: 0~100 Unit: None Actual Value Range: 0~100 MML Default Value: None Recommended Value: 60
Parameter Relationship: -Configuration constraints: In a CellPdcchAlgo MO, the value of CceThdtoEnableEpdcch must be larger than CceThdtoDisableEpdcch. Service Interrupted After Modification: No (And no impact on the UE in idle mode) mod e) Impact on Radio Network Performance: A smaller value of this parameter results in a lower probability of disabling the EPDCCH. As a result, RB resources cannot be fully utilized, and the network throughput decreases. A larger value of this parameter results in a higher probability of disabling the EPDCCH, which wastes RB resources and decreases the network throughput. Applicable Mode: L EcceThdtoDisableE pdcch
ECCE Usage Threshold To Disable EPDCCH
Meaning: Indicates the ECCE usage threshold for disabling EPDCCH. If the ECCE usage is lower than this parameter value, the eNodeB disables the EPDCCH. This parameter applies only to LTE FDD and LTE TDD. GUI Value Range: 0~100 Unit: None Actual Value Range: 0~100 MML Default Value: None Recommended Value: 5 Parameter Relationship: None Service Interrupted After Modification: No (And no impact on the UE in idle mode) mod e) Impact on Radio Network Performance: A smaller value of this parameter results in a lower probability of
disabling the EPDCCH. As a result, RB resources cannot be fully utilized, and the network throughput decreases. A larger value of this parameter results in a higher probability of disabling the EPDCCH, which wastes RB resources and decreases the network throughput. Applicable Mode: L RbThdtoDisableEpd RB Usage cch Threshold To Disable EPDCCH
Meaning: Indicates the downlink RB usage threshold for disabling EPDCCH. If the downlink RB usage is greater than this parameter value, the eNodeB disables the EPDCCH. This parameter applies only to LTE FDD and LTE TDD. GUI Value Range: 0~100 Unit: None Actual Value Range: 0~100 MML Default Value: None Recommended Value: 80 Parameter Relationship: -Configuration constraints: In a CellPdcchAlgo MO, the value of RbThdtoEnableEpdcch must be smaller than RbThdtoDisableEpdcch. Service Interrupted After Modification: No (And no impact on the UE in idle mode) mod e) Impact on Radio Network Performance: A larger value of this parameter results in a lower probability of disabling the EPDCCH, which wastes RB resources and decreases the network throughput. A smaller value of this parameter results in a higher probability of disabling the EPDCCH. As a result, RB
resources cannot be fully utilized, and the network throughput decreases. Applicable Mode: L HLNetAccSigAttem High Load Net Meaning: Indicates whether to enable functions related pt Access Signal to enhanced aggregation level selection for access Attempt signaling on high load networks. MSG5Attempt: Indicates whether to enable enhanced aggregation level selection for MSG5. If this option is selected, enhanced aggregation level selection is enabled for MSG5. If this option is deselected, enhanced aggregation level selection is disabled for MSG5. This option applies only to LTE TDD. GUI Value Range: MSG5Attempt(MSG5Attempt) Unit: None Actual Value Range: MSG5Attempt MML Default Value: None Recommended Value: 0 Parameter Relationship: None Service Interrupted After Modification: No (And no impact on the UE in idle mode) mod e) Impact on Radio Network Performance: If the MSG5Attempt option is selected, enhanced aggregation level selection of access signaling is attempted on high load networks where PDCCH resources are insufficient, to reduce the CCE signaling overheads. The reduction can improve the PDCCH capacity in high load networks and increase the cell throughput. However, PDCCH bit errors may increase for UEs experiencing strong interference. As a result, the access delay of these UEs may increase, and the E-RAB setup success rate may decrease. If the MSG5Attempt option is deselected, a high aggregation level is selected for access signaling to ensure the PDCCH reliability. However, PDCCH resources may be insufficient on high load networks, which reduces the number of
scheduled UEs supported by the PDCCH and the cell throughput. Applicable Mode: L EpdcchSfCfg
EPDCCH Subframe Configuration
Meaning: Indicates whether to configure the ePDCCH in all downlink subframes or in only downlink subframes dedicated to uplink or downlink grant. This parameter takes effect only on LTE TDD cells that use uplink-downlink subframe configuration 2. This parameter applies only to LTE FDD and LTE TDD. GUI Value Range: AllDlSfCfgEpdcch(AllDlSfCfgEpdcch), UlDlGrantSfCfgEpdcch(UlDlGrantSfCfgEpdcch) Unit: None Actual Value Range: AllDlSfCfgEpdcch, UlDlGrantSfCfgEpdcch MML Default Value: None Recommended Value: AllDlSfCfgEpdcch(AllDlSfCfgEpdcch) Parameter Relationship: None Service Interrupted After Modification: No (And no impact on the UE in idle mode) mod e) Impact on Radio Network Performance: If this parameter is set to AllDlSfCfgEpdcch, AllDlSfCfgEpdcch, the ePDCCH is configured in all downlink subframes after the ePDCCH is enabled. This configuration mode can increase uplink or downlink PRB usage if the PRB usage is low because PDCCH resources are insufficient for carrying uplink or downlink grant. If this parameter is set to UlDlGrantSfCfgEpdcch, the ePDCCH is configured only in downlink subframes dedicated to uplink or downlink grant after the ePDCCH is enabled. This configuration mode can solve the problem that PDCCH resources are insufficient for carrying uplink grant and reduce PUCCH overhead. However, this configuration mode cannot solve the
problem that PDCCH resources are insufficient for carrying downlink grant in downlink subframes dedicated to only downlink grant. Applicable Mode: L UlDlEcceInitialRati oAdjSw
UL DL ECCE Initial Ratio Adjustment Switch
Meaning: Indicates whether to enable adaptive adjustment of the initial ratios of the uplink and downlink enhanced control channel elements (eCCEs). If this parameter is set to ON(On), the initial ratios of uplink and downlink eCCEs can be dynamically adjusted in the range from 1 to Max(CceMaxInitialRatio,1) based on the uplink and downlink loads. If this parameter is set to OFF(Off), the initial ratios of uplink and downlink eCCEs is fixed to be Max(CceMaxInitialRatio,1). This parameter applies only to LTE TDD cells. GUI Value Range: OFF(Off), ON(On) Unit: None Actual Value Range: OFF, ON MML Default Value: None Recommended Value: OFF(Off) Parameter Relationship: None Service Interrupted After Modification: No (And no impact on the UE in idle mode) mod e) Impact on Radio Network Performance: If this parameter is set to ON(On), the initial ratios of uplink and downlink eCCEs are dynamically adjusted based on the uplink and downlink eCCE allocation, to meet uplink and downlink service requirements and ensure the required user experience. If this parameter is set to OFF(Off), the initial ratios of uplink and downlink eCCEs are not dynamically adjusted. In this case, the throughput may de crease if allocated eCCEs in the uplink or downlink cannot meet service requirements.
Applicable Mode: L CapacityBfOpt
BF Opt for Capacity based PDCCH Aggregation
Meaning: Indicates whether to optimize the calculation of the beamforming gain for capacity-based PDCCH aggregation level adaptation. This parameter applies only to LTE TDD cells. GUI Value Range: CAPACITY_BFOPT_OFF(CAPACITY_BFOPT_OFF ), CAPACITY_BFOPT_ON(CAPACITY_BFOPT_ON) Unit: None Actual Value Range: CAPACITY_BFOPT_OFF, CAPACITY_BFOPT_ON MML Default Value: None Recommended Value: If the PDCCH aggregation level adaptation strategy is based on capacity, it is recommended that this parameter be set to ON(On). Parameter Relationship: None Service Interrupted After Modification: No (And no impact on the UE in idle mode) mod e) Impact on Radio Network Performance: If this parameter is set to ON(On), the PDCCH SINR is is more accurately calculated when the capacity-based PDCCH aggregation level adaptation strategy is used in beamforming mode, reducing missing detections of UEs for downlink scheduling. If this parameter is set to OFF(Off), the eNodeB is more likely to miss detecting UEs with a smaller beamforming gain when the capacity-based PDCCH aggregation level adaptation strategy is used in beamforming mode. Applicable Mode: L
CCEThdEnableFlow Flow Control Ctrl Enable CCE Threshold
Meaning: Indicates the upper threshold of CCE usage. If the number of CCEs consumed by SRBs is larger
than this threshold, the eNodeB triggers MSG3 flow control. This parameter applies only to LTE TDD. GUI Value Range: 0~100 Unit: % Actual Value Range: 0~100 MML Default Value: None Recommended Value: 65 Parameter Relationship: None Service Interrupted After Modification: N/A Impact on Radio Network Performance: If this parameter is set to a large value, the eNodeB is less likely to trigger MSG3 flow control, increasing the probability that a large proportion of CCEs are consumed by SRBs. In this case, the impact on the experience of online UEs is great. If this parameter is set to a small value, the eNodeB is more likely to trigger MSG3 flow control, lowering the probability that a large proportion of CCEs are consumed by SRBs. In this case, the impact on the experience of online UEs is small, but the impact on the experience exp erience of UEs accessing the network is great. Applicable Mode: L CCEThdDisableFlo wCtrl
Flow Control Disable CCE Threshold
Meaning: Indicates the lower threshold of CCE usage. If the number of CCEs consumed by SRBs is smaller than this threshold, the eNodeB cancels MSG3 flow control, or does not trigger MSG3 flow control. This parameter applies only to LTE TDD. GUI Value Range: 0~100 Unit: % Actual Value Range: 0~100 MML Default Value: None
Recommended Value: 45 Parameter Relationship: None Service Interrupted After Modification: N/A Impact on Radio Network Performance: If this parameter is set to a large value, the eNodeB is more likely to cancel MSG3 flow control, increasing the probability that a large proportion of CCEs are consumed by SRBs. In this case, the impact on the experience of online UEs is great. If this parameter is set to a small value, the eNodeB is less likely to cancel MSG3 flow control, lowering the probability that a large proportion of CCEs are consumed b y SRBs. In this case, the impact on the experience ex perience of online UEs is small, but the impact on the experience of UEs accessing the network is great. Applicable Mode: L PDCCHPwrUpperLi PDCCH mitOptSw Power Upper Limit Optimization Switch
Meaning: Indicates whether to raise the PDCCH power increase limit. If this parameter is set to ON(On), the eNodeB raises the PDCCH power increase limit in the uplink and downlink subframes used to allocate CCEs when the CceMaxInitialRatio parameter in the CellPdcchAlgo is set to a large value. If this parameter is set to OFF(Off), the eNodeB does not raise the PDCCH power increase limit both in the uplink and downlink subframes used to allocate CCEs when the CceMaxInitialRatio parameter in the CellPdcchAlgo MO is set to a large value. This parameter pa rameter applies only to LTE TDD. GUI Value Range: OFF(Off), ON(On) Unit: None Actual Value Range: OFF, ON MML Default Value: None Recommended Value: OFF(Off) Parameter Relationship: None
Service Interrupted After Modification: N/A Impact on Radio Network Performance: If this parameter is set to ON(On), the PDCCH reliability reliability increases in the uplink and downlink subframes used to allocate CCEs when the CceMaxInitialRatio parameter in the CellPdcchAlgo is set to a large value. v alue. However, the scheduling delay may increase. If this parameter is set to OFF(Off), the eNodeB does not raise the P DCCH power increase limit both in the uplink and downlink subframes used to allocate CCEs when the CceMaxInitialRatio parameter in the CellPdcchAlgo MO is set to a large value. In this case, the PDCCH reliability decreases. Applicable Mode: L PdcchSparePowerAl PDCCH Spare locStrage Power Allocation Strategy
Meaning: Indicates the spare PDCCH power allocation strategy. When this parameter is set to NONE, spare PDCCH power is not allocated. When this parameter is set to WEAKCOVERAGEUSER, spare power of the PDCCH with the current CFI is allocated to UEs with weak coverage. When this parameter is set to BIGPKTUSER, spare power of the PDCCH with the current CFI is allocated to UEs with large-packet transmission. This parameter applies only to LTE FDD and LTE TDD. GUI Value Range: NONE(NONE), WEAKCOVERAGEUSER(WEAKCOVERAGEUSER ), BIGPKTUSER(BIGPKTUSER) Unit: None Actual Value Range: NONE, WEAKCOVERAGEUSER, BIGPKTUSER MML Default Value: None Recommended Value: NONE(NONE) Parameter Relationship: None Service Interrupted After Modification: N/A
Impact on Radio Network Performance: When this parameter is set to NONE, network performance is not affected. When this parameter is set to WEAKCOVERAGEUSER, the PDCCH demodulation performance of the UEs with weak coverage improves; however, the interference to neighboring cells' PDCCH increases. When this parameter is set to BIGPKTUSER, the PDCCH demodulation performance of the UEs with large-packet transmission improves; however, the interference to neighboring cells' PDCCH increases. Applicable Mode: L VoltePdcchSinrOffs et
Volte PDCCH SINR Offset
Meaning: Indicates the PDCCH SINR offset of voice UEs. This parameter is used to adjust the PDCCH aggregation level and PDCCH power po wer for such UEs. If this parameter is set to 0, adjustment of the PDCC H aggregation level and PDCCH power does not take effect. It is recommended that this parameter be set to 30 for cells with few voice UEs to improve the transmission reliability of the control channel occupied by voice UEs. This parameter applies only to LTE TDD. GUI Value Range: 0~150 Unit: 0.1dB Actual Value Range: 0~15 MML Default Value: None Recommended Value: If CCEs are not restricted in the uplink, set this parameter to 30 to improve the transmission reliability of the control channel occupied by voice UEs. If CCEs are restricted in the uplink, set this parameter to 0 to shorten the scheduling delay of voice UEs caused by limited control channel resources. Parameter Relationship: None Service Interrupted After Modification: N/A Impact on Radio Network Performance: If this parameter is set to a large value, the PDCCH aggregation level and the PDCCH power for voice UEs
increase. In this case, PDCCH resources are wasted, but the PDCCH demodulation success rate is high. If this parameter is set to a small value, the PDCCH aggregation level and the PDCCH power for voice UEs decrease. In this case, PDCCH resources are saved, but the PDCCH demodulation success rate is low. Applicable Mode: L PdcchDlAggLvlSlcE Enhanced hnSwitch PDCCH DL Agg Lev Selection
Meaning: Indicates whether to optimize PDCCH aggregation level selection. The PDCCH BLER caused due to no responses from the UE is used as a reference for PDCCH aggregation level selection only when this parameter is set to ON. This parameter applies only to LTE FDD. GUI Value Range: OFF(Off), ON(On) Unit: None Actual Value Range: OFF, ON MML Default Value: None Recommended Value: OFF(Off) Parameter Relationship: None Service Interrupted After Modification: No (And no impact on the UE in idle mode) mod e) Impact on Radio Network Performance: When this parameter is set to ON, a high PDCCH aggregation level is selected if the PDCCH BLER caused due to no responses from the UE is high. Applicable Mode: L
PdcchOutLoopAdjB PDCCH Out aseStep Loop Adjustment Baseline Step
Meaning: Indicates the baseline step used for outer-loop adjustment of the PDCCH. The selection of an appropriate step for the adjustment is dependent on this baseline step. This parameter applies only to LTE FDD and LTE TDD. GUI Value Range: 0~10
Unit: 0.1dB Actual Value Range: 0~1 MML Default Value: None Recommended Value: 2 Parameter Relationship: None Service Interrupted After Modification: No (And no impact on the UE in idle mode) mod e) Impact on Radio Network Performance: If this parameter is set to a small value, DTX-based outer-loop adjustment of the PDCCH is slow. As a result, the aggregation level adjustment is slow and cannot effectively adapt to drastic channel condition changes. If this parameter is set to a large value, DTX-based outer-loop adjustment of the PDCCH is fast. As a result, the aggregation level adjustment is fast and can quickly adapt to drastic channel condition changes. It is recommended that this parameter be set to 5 if uplink interference is not severe. In the case c ase of severe uplink interference, uplink non-DTX transmissions are incorrectly decoded as DTX in most cases. In this situation, setting this parameter to a non-default value results in excessive aggregation level adjustment, causing the capacity to decrease. Applicable Mode: L PdcchOutLoopAdjL PDCCH Out owerLimit Loop Adjustment Value Lower Thld
Meaning: For FDD: indicates the lower limit of the adjustment amount for outer-loop adjustment of the PDCCH. For TDD: indicates the lower limit of the initial adjustment amount for outer-loop adjustment of the PDCCH. This parameter applies only to LTE FDD and LTE TDD. GUI Value Range: -20~0
Unit: dB Actual Value Range: -20~0 MML Default Value: None Recommended Value: The value -5 is recommended for FDD. The value -2 is recommended for TDD. Parameter Relationship: None Service Interrupted After Modification: No (And no impact on the UE in idle mode) mod e) Impact on Radio Network Performance: A smaller value of this parameter results in a larger range for DTX-based outer-loop adjustment of the PDCCH and therefore looser restriction on aggregation level selection, ensuring normal DTX-based PDCCH aggregation level adjustment in special scenarios. A larger value of this parameter results in a smaller range for DTX-based outer-loop adjustment of the PDCCH and therefore stricter restriction on aggregation level adjustment, causing the failure to increase the aggregation level in case of a larger number n umber of DTX transmissions in special scenarios. In the case of severe uplink interference, uplink nonDTX transmissions are incorrectly decoded as DTX in most cases. In this situation, setting this parameter to a non-default value results in excessive aggregation level adjustment, causing the capacity to decrease. Applicable Mode: L PdcchAdjAlgoSwitc PDCCH h Adjust Algorithm Switch
Meaning: Indicates whether to optimize PDCCH adjustment algorithms. This parameter applies only to LTE TDD. CCE8PcOptSwitch: Indicates the basis of performing dynamic power control for UEs with a CCE aggregation level of 8 when the CCE aggregation level is adjusted based on capacity. If this option is selected, the PDCCH power for UEs with a CCE aggregation
level of 8 is dynamically adjusted based on PDCCH quality. This option applies only to LTE TDD. GUI Value Range: CCE8PcOptSwitch(CCE8PcOptSwitch) Unit: None Actual Value Range: CCE8PcOptSwitch MML Default Value: None Recommended Value: If the adaptation policy of the CCE aggregation level for the PDCCH is based on capacity, it is recommended that the CCE8PcOptSwitch CCE8P cOptSwitch option be selected. Parameter Relationship: None Service Interrupted After Modification: No (And no impact on the UE in idle mode) mod e) Impact on Radio Network Performance: CCE8PcOptSwitch: If this option is selected, the cell throughput increases when the PDCCH is restricted, and the user-perceived rate in weak coverage scenarios decreases. If this option is deselected, the eNodeB selects a high CCE aggregation level for UEs in weak coverage scenarios, consuming more PDCCH resources but lowering the probability of missing detecting the PDCCH in weak coverage scenarios. Applicable Mode: L SplitBeamPdcchSd maThd
PDCCH Split Beam SDMA Threshold
Meaning: Indicates the threshold of isolation for deciding whether to perform SDMA for PDCCH transmission in beam splitting scenarios. For a UE, if the ratio of the RSRP of obtained from combined beams providing strong signals to that of providing weak signals in an SFN cell is greater than or equal to this threshold when PDCCH data is transmitted in beam splitting scenarios, the UE uses the resources allocated to transmit beams providing strong signals, and resources allocated for weak signals can be used by
other UEs. This parameter applies only to 64T64R LTE TDD cells. GUI Value Range: 0~100 Unit: 0.5dB Actual Value Range: 0~50 MML Default Value: None Recommended Value: 24 Parameter Relationship: None Service Interrupted After Modification: No (And no impact on the UE in idle mode) mod e) Impact on Radio Network Performance: If this parameter is set to a large value, the average PDCCH aggregation level and PDCCH SDMA ratio are low. If this parameter is set to a small value, the average PDCCH aggregation level is high, but the PDCCH SDMA ratio is also high. Set this parameter to an appropriate value so that the resource usage for the PDCCH and SDMA S DMA ratio can be balanced, increasing PDCCH capacity of the cell. Applicable Mode: L NackDtxRatioThd
NACK and DTX Ratio Threshold
Meaning: Indicates the threshold of the proportion of the sum of NACKs and DTXs to all the uplink HARQ feedback for downlink scheduling. If the proportion of the sum of NACKs and DTXs to all the uplink HARQ feedback of a UE is higher than this threshold, the eNodeB stops scheduling the UE in a certain period. If this parameter is set to 0, the eNodeB does do es not stop scheduling UEs based on the proportion of the sum of NACKs and DTXs to all the uplink HARQ feedback. This parameter applies only to LTE TDD. GUI Value Range: 0~100
Unit: % Actual Value Range: 0~100 MML Default Value: None Recommended Value: 50 Parameter Relationship: None Service Interrupted After Modification: No (And no impact on the UE in idle mode) mod e) Impact on Radio Network Performance: If this parameter is set to 0, network performance is not affected. If this parameter is set to a large value, the cell throughput increases by a small margin when strong uplink interference occurs and air interface resources are limited in heavy-load scenarios. If this parameter is set to a small value other than 0, the cell throughput increases by a large margin when strong uplink interference occurs and air interface resources are limited in heavy-load scenarios. In this case, UEs suffering from strong uplink interference have to wait longer for scheduling, and the perceived rate decreases. Applicable Mode: L SplitBeamPdcchSd maSw
PDCCH Split Beam SDMA Switch
Meaning: Indicates whether to perform SDMA for PDCCH transmission in beam splitting scenarios. MASSIVE_MIMO_PDCCH_SDMA_SW: If this option is selected, SDMA is performed for PDCCH transmission in beam splitting scenarios. If this option is deselected, full joint transmission is always performed for PDCCH transmission in beam splitting splitting scenarios. This option applies only to LTE TDD. GUI Value Range: MASSIVE_MIMO_PDCCH_SDMA_SW(MASSIVE_ MIMO_PDCCH_SDMA_SW) Unit: None Actual Value Range: MASSIVE_MIMO_PDCCH_SDMA_SW
MML Default Value: None Recommended Value: MASSIVE_MIMO_PDCCH_SDMA_SW:OFF Parameter Relationship: None Service Interrupted After Modification: No (And no impact on the UE in idle mode) mod e) Impact on Radio Network Performance: MASSIVE_MIMO_PDCCH_SDMA_SW: If this option is selected, SDMA can be performed for PDCCH transmission in scenarios of beam splitting for massive MIMO, increasing PDCCH capacity. If this option is deselected, SDMA is not performed for PDCCH transmission in scenarios of beam splitting for massive MIMO. Applicable Mode: L PdcchPwrCtrlUserN PDCCH umThd Power Control User Num Threshold
Meaning: Indicates whether to perform PDCCH power optimization for heavy-load networks, and specifies the threshold of the number of UEs for triggering the optimization. If this parameter is set to 65535, PDCCH power optimization is disabled for heavy-load networks. If this parameter is set to a value ranging from 0 to 1050, PDCCH power p ower optimization is enabled for heavy-load networks, and the eNodeB uses this threshold to determine whether to perform the optimization. This parameter applies only to LTE TDD. GUI Value Range: 0~1050,65535 Unit: None Actual Value Range: 0~1050,65535 MML Default Value: None Recommended Value: It is recommended that this parameter be set to 280 for heavy-load massive MIMO networks and to 150 for heavy-load heav y-load non-massive MIMO networks.
Parameter Relationship: None Service Interrupted After Modification: No (And no impact on the UE in idle mode) mod e) Impact on Radio Network Performance: A small value of this parameter leads to strict PDCCH power control for heavy-load networks and a high DTX proportion, affecting user experience. A large value of this parameter leads to loose PDCCH power control for heavy-load networks and a low DTX proportion, improving user experience. A too large value of this parameter, however, leads to extremely loose PDCCH power control for heavy-load networks and a limited DTX proportion, affecting user experience. Set this parameter based on the number of UEs used as the criterion for heavy load. Applicable Mode: L PdcchBfGainOffset
PDCCH Beamforming Gain Offset
Meaning: Indicates the PDCCH beamforming gain offset for DMIMO cells when the PDCCH aggregation level is selected based on coverage. If this parameter is set to -127, optimization of PDCCH beamforming gain offset is disabled. If this parameter is set to a value ranging from -10 to 10, optimization of PDCCH P DCCH beamforming gain offset is enabled, and the offset is specified by this parameter. This parameter applies only to LTE TDD. GUI Value Range: -127,-10~10 Unit: None Actual Value Range: -127,-10~10 MML Default Value: None Recommended Value: 0 Parameter Relationship: None Service Interrupted After Modification: No (And no impact on the UE in idle mode) mod e)
Impact on Radio Network Performance: A large value of this parameter leads to a high PDCCH aggregation level in DMIMO scenarios and low DTX proportion, but a high probability that uplink and downlink CCEs are restricted and allocation of these CCEs fails. A small value of this parameter leads to a low PDCCH aggregation level in DMIMO scenarios and high DTX proportion, but a low probability of failures of uplink and downlink CCE allocation. Applicable Mode: L
Example To modify the configuration of the PDCCH resource allocation algorithm with the parameters as follows: Local cell ID: 0, SignalCongregateLevel: CONGREG_LV4,Cce Ratio Adjust Switch: ON, PDCCH Initial Symbol Number: 3,PDCCH Virtual Loading Proportion: 0,PDCCH Symbol Number Adjust Switch: ON,CCE use ratio: 100, run the following command: MOD CELLPDCCHALGO:LocalCellId=0, ComSigCongregLv=CONGREG_LV4, CceRatioAdjSwitch=ON, InitPdcchSymNum=3, VirtualLoadPro=0, PdcchSymNumSwitch=ON, CceUseRatio=100;
Parent topic: eNodeBFunction MML Commands
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