Network Impact
MOD ULOCELL
This new parameter specifies whether to enable the Narrowband Interference Suppression feature.
Performance Management
No impact.
Fault Management
Change Type
Alarm Name Description
Modified Local Cell Capability Decline
The cause value 25 has been added. The alarm with cause value 25 is generated when a cell is enabled with the Narrowband Interference Suppression feature but does not support the feature.
4.36.7 Impact on Other Features
Prerequisite Features
None
Mutually Exclusive Features
None
Impacted Features
After the Narrowband Interference Suppression feature is enabled, all the RTWP values used are those measured after narrowband interference suppression. Therefore, this feature affects all the following features that use RTWP values:
WRFD-020101 Admission Control
WRFD-01061202 HSUPA Admission Control
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WRFD-020136 Anti-Interference Scheduling for HSUPA
WRFD-01061209 HSUPA HARQ and Fast UL Scheduling in Node B
WRFD-01061402 Enhanced Fast UL Scheduling
For details, see section 10.6.1 "System Capacity and Network Performance" in Load Control Feature Parameter Description.
4.37 MRFD-211901/ MRFD-221901 Multi-RAT Carrier Joint Shutdown(Optional/New)
4.37.1 Feature Description
This multi-mode feature is new in SRAN8.0. It includes the following on the GBSS15.0, RAN15.0:
MRFD-211901 Multi-RAT Carrier Joint Shutdown (GBTS)
MRFD-221901 Multi-RAT Carrier Joint Shutdown (NodeB)
With the development of mobile broadband services, areas covered by GSM and UMTS networks are increasing at great speeds. The Multi-RAT Carrier Joint Shutdown feature applies to these areas. With this feature, a UMTS cell can be intelligently shut down or restarted depending on the traffic volume.
When the traffic volumes of both the GSM and UMTS cells are low, the UMTS cell is shut down and GSM cells provide services for all UEs in the area. When the traffic volumes of the GSM cells increase, the UMTS cell is restarted to meet the traffic requirements. By intelligently shutting down the UMTS cell, this feature reduces the overall power consumption of the GSM and UMTS networks and implements energy conservation and emission reduction, reducing the operating expense (OPEX).
4.37.2 System Capacity and Network Performance
System Capacity
No impact.
Network Performance
This feature affects the UE peak rates, call drop rate on the FACH, and service availability to UEs supporting only UMTS as follows:
UE peak rates
If there are multi-mode terminals on the UMTS network, the multi-mode terminals are handed over or reselected to the GSM network after the UMTS cell is shut down. These multi-mode terminals can initiate services only on the GSM network before the UMTS cell is restarted. Therefore, the peak rates of and experience in data services for these multi-mode terminals are negatively affected.
Call drop rate on the FACH
Before shutting down the UMTS cell, the RNC releases the connections of UEs in the CELL_FACH state. This is to enable the UEs to reselect a GSM cell if there are UEs in the CELL_FACH state in the UMTS cell and DynShutDownCchUserSwitch is set to OFF. As a result, the call drop rate on the FACH increases.
Service availability to UEs supporting only UMTSAfter the UMTS cell is shut down, UEs supporting only UMTS cannot initiate services.
This feature may also affect the inter-RAT handover and cell reselection success rates, prolong the access delay, and cause UEs in the idle state to drop from the network. Details are as follows:
Inter-RAT handover and cell reselection success rates
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− Before the UMTS cell is shut down, the online multi-mode UEs on the UMTS network are handed over or reselected to the GSM network.
− After the UMTS cell is restarted, the online multi-mode UEs are reselected to the UMTS network.
As the number of inter-RAT handovers and cell reselections increase, the inter-RAT handover and cell reselection success rates may be affected.
Access delay and UEs in the idle state dropping from the network
After the UMTS cell is shut down, the multi-mode terminals in the idle state are reselected to a GSM cell. After the UMTS cell is restarted, the multi-mode terminals in the idle state are reselected to the UMTS cell. During the cell reselection, the following cases may occur:
− The multi-mode terminals in the idle state may drop from the network after cell reselection.
− The routing areas of GSM and UMTS cells may be different, and the cell reselection triggers LA updates. The multi-mode terminals in the idle state occupy access channel resources during the LA updates, temporarily affecting the access of other UEs.
4.37.3 NEs
This feature is implemented on the BSC, RNC, NodeB, and M2000.
UEs must support both GSM and UMTS.
4.37.4 Hardware
This feature requires information exchange between the GSM and UMTS networks. If the base station controllers are a BSC and an RNC, the physical connections for the Iur-g interface between the BSC and the RNC must be added.
4.37.5 Inter-NE Interfaces
The Iur-g interface must be configured between the BSC and the RNC. The Iur-g interface is a Huawei proprietary interface and enables control information exchange between the BSC and the RNC by Huawei proprietary messages.
4.37.6 Operation and Maintenance
License
A site-level license for this feature is added on the BSC side.
A site-level license for this feature is added on the NodeB side.
Configuration Management
This feature introduces the following RNC-level parameters.
Change Type
Parameter ID MML Command Description
New IRATCommo nMeasSwitch
SET UMBSCCRRM Whether to enable the Multi-RAT Carrier Joint Intelligent Shutdown feature
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Type
Parameter ID MML Command Description
New IRATShutdo
Downlink load threshold for triggering UMTS cell intelligent shutdown
Uplink load threshold for triggering UMTS cell intelligent shutdown
Neighboring GSM load threshold for triggering UMTS cell intelligent shutdown New IRATshutdo
Neighboring GSM load hysteresis for UMTS cell restart
Time latency for UMTS cell restart. A UMTS cell can be restarted only after its
shutdown period is longer than the value specified by this parameter.
Period for cell shutdown decision. When a UMTS cell has met shutdown conditions for a period longer than this parameter value, the UMTS cell is shut down.
New NIRATOverL ap
ADD/MOD U2GNCELL
Overlapping coverage flag.
When this parameter is set to YES, one or multiple
neighboring GSM cells cover the same area as a UMTS cell.
This feature introduces the following BSC-level parameters.
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Type
Parameter ID MML Command Description
New IRATHighPri Switch
SET GCELLSOFT Whether the priorities of data services performed by multi-mode UEs are considered in the Multi-RAT Carrier Joint Intelligent Shutdown feature.
When this switch is turned on, the priorities of data services performed by multi-mode UEs are considered to meet the differentiated service requirements.
New IRATShutdo wnSwitch
SET GCELLSOFT Whether to enable the Multi-RAT Carrier Joint Intelligent Shutdown feature
Performance Management
This feature does not add any new performance counters. The performance of this feature is monitored by existing counters of cell-level cell shutdown duration, cell shutdown times, and cell restart times.
Fault Management
No impact.
4.37.7 Impact on Other Features
Prerequisite Features
When multiple inter-frequency same-coverage UMTS cells cover the same area as GSM cells, the inter-frequency same-coverage UMTS cells of the current UMTS cell must have either of the following features enabled:
WRFD-020117 Multi-Carrier Switch off Based on Traffic Load
WRFD-020122 Multi-Carrier Switch off Based on QoS
If one UMTS cell covers the same area as GSM cells, the Multi-RAT Carrier Joint Intelligent Shutdown feature does not depend on the preceding features.
Mutually Exclusive Features
The Multi-RAT Carrier Joint Intelligent Shutdown feature cannot be used together with the feature MRFD-211802 GSM and UMTS Dynamic Spectrum Sharing.
Impacted Features
Operators are advised to enable this feature together with the following feature and function to achieve superior performance:
WRFD-031000 Intelligently Out of Service
Preferential Allocation of Channels on the BCCH TRX
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GBFD-111602 TRX Power Amplifier Intelligent Shutdown
4.38 WRFD-010612 HSUPA Introduction Package (Enhanced/Optional)
This feature is enhanced due to the enhancement of the sub-feature WRFD-01061209 HSUPA HARQ and Fast UL Scheduling in NodeB. For details, see section 4.39 “WRFD-01061209 HSUPA HARQ and Fast UL Scheduling in NodeB (Enhanced/Optional).”
4.39 WRFD-01061209 HSUPA HARQ and Fast UL Scheduling in NodeB (Enhanced/Optional)
The HSUPA Scheduling Based on UE Location function is introduced in RAN15.0 and this function is the enhancement of the WRFD-01061209 HSUPA HARQ and Fast UL Scheduling in NodeB feature.
This section describes the impact brought by this function.
4.39.1 Feature Description
This function decreases the SPI weight of HSUPA BE UEs in soft handover areas of a cell to reduce the interference from these UEs on other UEs in the same cell and on UEs in neighboring cells and to ultimately expand the uplink cell capacity.