Non-SHO Area
4.12 WRFD-15020103 Micro Cell Dynamic Rx Sensitivity Control (New/Optional)
4.12.1 Feature Description
With this feature enabled, the micro cell adjusts its receive sensitivity by implementing desensitization.
Desensitization is a process in which the micro NodeB fills in the white noise to the RRU receive channel. The micro NodeB makes the uplink boundary coincide with the downlink boundary by
adjusting desensitization intensity to eliminate the difference in the uplink between the macro and micro cells.
Reducing the receive sensitivity of the micro cell raises the uplink transmit power for all UEs in the micro cell. Therefore, worst users in the micro cell, which are close to the macro cell, cause more interference to the macro cell. To minimize the interference, the receive sensitivity for the micro cell is reduced only if there are UEs in the macro-micro problem area. If a UE is detected in the macro-micro problem area, the RNC instructs the micro cell to implement desensitization to reduce the receive
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4-30 sensitivity. If all UEs move out of the macro-micro problem area or their RRC connections are released, the micro cell cancels desensitization to restore the receive sensitivity.
4.12.2 System Capacity and Network Performance
Independent use of WRFD-15020103 Micro Cell Dynamic Rx Sensitivity Control will affect the system capacity and network performance as follows.
System Capacity
For details, see section 4.9.3 "System Capacity and Network Performance (for Scenarios Where All Cells Operate at the Same Frequency Band)."
Network Performance
For details, see section 4.9.3 "System Capacity and Network Performance (for Scenarios Where All Cells Operate at the Same Frequency Band)."
4.12.3 NEs
This feature is implemented on the RNC, NodeB, M2000, and Configuration Management Express (CME).
4.12.4 Hardware
No impact.
4.12.5 Inter-NE Interface
An information element (IE) has been added for this feature.
A private IE DesensPower has been added in the Physical Shared Channel Reconfiguration Request IE.
The DesensPower IE indicates the absolute value of the current desensitization power in the unit of dBm.
4.12.6 Operation and Maintenance
License
A new license item has been introduced on the RNC to control this feature at the cell level.
Feature ID Feature Name License Control Item NE Sales Unit
WRFD-150201 WRFD-150201 Macro &
Micro Co-carrier Uplink Interference Control
Macro & Micro Co-carrier Uplink Interference Control (Per Cell)
RNC per cell
Configuration Management
The following table lists the parameter that has been added on the RNC for this feature.
Change Type Parameter ID MML Command Description
New COMacroMicro DesenseSwitch
ADD/RMV/MOD/L ST
Specifies whether the current cell supports macro-micro correlative
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4-31 Change Type Parameter ID MML Command Description
UCELLDESENSE desensitization. When this parameter is set to ON, the current cell supports macro-micro correlative desensitization.
When this parameter is set to OFF, the current cell does not support macro-micro correlative desensitization.
Only BTS3902E of RAN15.0 or later allows this parameter setting to ON.
Otherwise the throughput rate in the micro cell is abnormal.
New ReportIntervalf or1APre
SET/LST UHOCOMM
Specifies the interval between the reports that are triggered by event 1A' in macro-micro problem areas.
New TotalDesensCa ncelTimeLen
ADD/RMV/MOD/L ST
UCELLDESENSE
Specifies the length of a timer for periodically canceling global
desensitization. Each time when this timer expires, the RNC determines whether to cancel the global desensitization on the current micro cell. After the global desensitization cancelation, the current micro cell enters the partial
desensitization state.
New MicroCellFlag ADD/RMV/MOD/L ST
UCELLDESENSE
Specifies whether to set the current cell as a micro cell. If this parameter is set to True, the current cell is a micro cell.
Otherwise, it is a macro cell.
New Macro2MicroUl Diff
ADD/RMV/MOD/L ST
UCELLDESENSE
Specifies the uplink receiving capacity different between the macro cell and micro cell. The value of this parameter depends on the number of antennas in the macro and micro cells and tower mounted amplifier (TMA). For example, this
parameter is set to 3 dB in the following conditions:
The macro cell uses four antennas.
The micro cell uses two antennas.
The micro cell uses two antennas.
New Total2PartDese nseDiff
ADD/RMV/MOD/L ST
UCELLDESENSE
Specifies the difference between global desensitization intensity and partial desensitization intensity of a micro cell.
Partial desensitization intensity = Full desensitization intensity –
Total2PartDesenseDiff.
Specifies whether to send the event 1A' measurement control message. If the parameter is set to ON, the RNC sends the event 1A' measurement control
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4-32 Change Type Parameter ID MML Command Description
UCELLHOCOMM message to identify users in the macro-micro problem areas 1A'-1A. If the parameter is set to OFF, the RNC does not send the event 1A' measurement control message.
When a user whose best cell is the macro cell moves to an area near to the micro cell and its link to the micro cell has not been added to the active set, the user causes large interference to the micro cell in the uplink. This type of area is referred to as the macro-micro problem area and event 1A' is added to identify this type of users. Event 1A' is reported when a user moves to the macro-micro problem area and ReportIntervalfor1APre specifies the interval of periodic reports.
Events 1A and 1APre have the same measurement reports and their only difference lies in measurement IDs. That is, the RNC differentiates between event 1A and event 1A' only by the
measurement ID.
When the Micro Cell Dynamic Rx Sensitivity Control feature is enabled in the micro cell, the event 1APre threshold is the value of Total2PartDesenseDiff in the ADD UCELLDESENSE command.
Otherwise, the event 1A' threshold is equal to the global desensitization intensity.
Performance Management
This feature has an impact on the following RNC counters:
Change Type Counter Name Measurement Unit
Description
New VS.TotalDesense.Num ALGO.Cell Specifies the total number of times a micro cell transits to the total desensitization state.
New VS.TotalDesense.Time ALGO.Cell Specifies the duration of the total desensitization state for a micro cell.
New VS.MeanDesensePwr ALGO.Cell Specifies the average
desensitization intensity for a micro cell.
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4-33 This feature has no impact on the NodeB counters.
Fault Management
No impact.
4.12.7 Impact on Other Features
Prerequisite Features
WRFD-150201 Macro & Micro Co-carrier Uplink Interference Control
Mutually Exclusive Features
None
Impacted Features
Working with WRFD-020136 Anti-Interference Scheduling for HSUPA, the Micro Cell Dynamic Rx Sensitivity Control feature can raise the received total wideband power (RTWP) and reduce uplink coverage of the micro cell.
Working with WRFD-140211 Dynamic Target RoT Adjustment, the Micro Cell Dynamic Rx Sensitivity Control feature can reduce uplink capacity gains generated by the WRFD-140211 Dynamic Target RoT Adjustment feature for the micro cell.
Working with Auto-Adaptive Background Noise Update Switch, the Micro Cell Dynamic Rx Sensitivity Control feature can reduce the number of times for which the switch takes effect.
When enabled, the Micro Cell Dynamic Rx Sensitivity Control feature disables the static desensitization function and annuls the configured desensitization intensity. When this feature is disabled, the static desensitization function needs to be reconfigured before it is available again.
NOTE
To specify a desensitization intensity, run SET ULOCELLDESENS: DI on the NodeB. Once specified, the intensity will not change.