Impacted Features
4.4 WRFD-141103 Automatic NodeB and Cell Allocation in the RNC(New/Basic)
4.4.1 Description
When an operator configures NodeBs, cells, NodeB Control Ports (NCPs), and Communication Control Ports (CCPs), the BSC6910 automatically allocates the NodeBs, cells, NCPs, and CCPs to CP
subsystems of the EGPUa boards. Operators no longer need to specify the subrack No., slot No., or subsystem No..
The BSC6910 monitors the traffic load on the EGPUa boards. If the traffic load becomes unbalanced due to heavy traffic, the BSC6910 dynamically redistributes the NodeBs, cells, NCPs, and CCPs among CP subsystems of the EGPUa boards. The BSC6910 implements the dynamic redistribution by means of:
Periodic redistribution
Periodic redistribution applies to NodeBs, cells, NCPs, and CCPs, and balances
NodeB/cell/NCP/CCP resource management load. Periodic redistribution should be performed in the early morning when the traffic is light.
Immediate redistribution
Immediate redistribution applies only to cells and balances cell resource management load when heavy traffic bursts occur in a subsystem.
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4.4.2 Capacity and Performance
System Capacity
This feature allows NodeB/cell/NCP/CCP resource management load to be shared among CP subsystems. This balances CP load and improves system capacity.
Network Performance
This feature automatically allocates NodeBs, cells, NCPs, and CCPs, and dynamically redistributes them based on the load. This reduces manual maintenance and configuration workload. However, load-based dynamic redistribution affects ongoing services as follows:
During immediate redistribution, which takes about 10 seconds, UEs in the cell cannot initiate a call.
NOTE
UEs in the CELL_DCH, CELL_FACH, CELL_PCH, or URA_PCH state do not drop from the network. UEs in idle mode continue to camp on the cell.
During periodic redistribution:
− UEs in the CELL_DCH, CELL_FACH, CELL_PCH, or URA_PCH state drop from the network.
− UEs in idle mode may temporarily drop from the network.
− Cells are automatically reestablished. A NodeB with 12 cells will be out of service for about 20 seconds.
NOTE
During either immediate or periodic redistribution, NodeBs, cells, NCPs, and CCPs will be removed and then reestablished. Therefore, the values of the performance counters for monitoring the NodeBs, cells, NCPs, and CCPs may be inaccurate.
4.4.3 Impact on NEs
This feature is implemented on the RNC and M2000.
4.4.4 Impact on Hardware
Only the BSC6910 supports this feature.
4.4.5 Inter-NE Interface
No impact.
4.4.6 Operation and Maintenance
License
This feature is a basic feature and is not under license control.
Configuration Management
Table 4-5 describes the new RNC MML commands related to this feature.
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Change Type
MML Command Description
New SET
UCELLAUTOHOMING
Use this command to set the following parameters related to load-based dynamic redistribution:
SchedHomingSwitch
ImmdHomingSwitch
SchedAssignOutCpuThd
SchedAssignInCpuThd
SchedAssignInCpuThd
ImmdAssignInCpuThd
SchedHomingMode
New LST
UCELLAUTOHOMING
Use this command to query the parameters related to load-based dynamic
redistribution.
New ACT UNODEB Use this command to activate a NodeB.
Table 4-6 describes the modified RNC parameters related to this feature.
Table 4-6 Modified RNC parameters related to this feature Change
Type
Parameter ID
MML Command Description
Added value
DSPT DSP UCELL A value BYHOMELESSCELL is added to this parameter.
If this parameter is set to BYHOMELESSCELL, the Homeless Cell table is queried.
Added value
DSPT DSP UNODEB A value BYHOMELESSCELL is added to this parameter.
If this parameter is set to BYHOMELESSCELL, the Homeless NodeB table is queried.
Added value
IDTYPE DSP UIUBCP A value BYHOMELESSIUBCP is added to this parameter.
If this parameter is set to BYHOMELESSIUBCP, the Homeless IubCp table is queried.
Performance Management
Table 4-7 describes the new RNC counters related to this feature.
Table 4-7 New RNC counters related to this feature
Change Type Counter Measurement Unit Meaning
New VS.AutoHoming.
AttNodeB
ALGO.RNC This counter measures the number of attempts to dynamically redistribute NodeBs from one subsystem to another.
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New VS.AutoHoming.
SuccNodeB
ALGO.RNC This counter measures the number of successful attempts to dynamically redistribute NodeBs from one subsystem to another.
New VS.AutoHoming.
AttCell
ALGO.RNC This counter measures the number of attempts to dynamically redistribute cells from one subsystem to another.
New VS.AutoHoming.
SuccCell
ALGO.RNC This counter measures the number of successful attempts to dynamically redistribute cells from one subsystem to another.
New VS.AutoHoming.
AttIubcp
ALGO.RNC This counter measures the number of attempts to dynamically redistribute NCPs/CCPs from one subsystem to another.
New VS.AutoHoming.
SuccIubcp
ALGO.RNC This counter measures the number of successful attempts to dynamically redistribute NCPs/CCPs from one subsystem to another.
Fault Management
This feature enables dynamic redistribution of NodeBs, cells, NCPs, and CCPs based on the board status and system resource usage. The Subrack No., slot No., and subsystem No. do not need to be specified. Therefore, alarms related to the NodeBs, cells, NCPs, and CCPs do not provide information about subracks, slots, or subsystems.
The cause value CP Congestion is added to four alarms:
ALM-21511 CCP Faulty
ALM-22202 UMTS Cell Unavailable
ALM-22214 NodeB Unavailable
ALM-21510 NCP Faulty
4.4.7 Impact on Other Features
No impact.