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RAN955 BTS Power Saving Mode
1 © Nokia Siemens Networks 2012
Outline
General Introduction
Interdependencies
Technical Details
Network Parameters
KPIs and Counters
2 © Nokia Siemens Networks 2012
User scenarios/ Use Cases
General IntroductionRAN955 BTS Power Saving Mode
3 © Nokia Siemens Networks 2012
RAN955 BTS Power Saving Mode
Brief description:• This feature allows operator to shutdown cells to gain power saving in BTS during low traffic periods• When traffic increases, the shutdown cells can be re-activated to handle the traffic
Motivation and benefits:• Opex savings to operator during low traffic periods due to power savings
Brief Introduction & Benefits of RAN955
4 © Nokia Siemens Networks 2012
General Release Information on RAN955
Common O&M Platform Feature No
BSW/ASW ASW
RAS SW Component RAN
WCDMA Release RU20
I-HSPA System
BTS (Flexi) WBTS6.0
Supplementary O&M InformationRelease Information
5 © Nokia Siemens Networks 2012
License ControlLong term
ON/OFF license control
NetAct OSS5.2
HW Requirements Flexi Rel1, Flexi rel.2, Ultra, EUBB
UE Release -
With and Without RAN955
RAN955 Activated
RAN955 Not activated
Power consumption during low load conditions (e.g. nights hours)
Time
Power savings related to switched off cells with low load conditions (e.g. nights hours) Continuous service availability within green area
6 © Nokia Siemens Networks 2012
InterdependenciesRAN955 Power Saving Mode
7 © Nokia Siemens Networks 2012
RAN955 Power Saving Mode
Requirements of RAN955
There are no feature requirements connected with RAN955
RAN955BTS Power Saving
8 © Nokia Siemens Networks 2012
BTS Power Saving Mode
Requirements of RAN955
RAN955BTS Power Saving
The following features are recommended to be in use in the RNC, as they help balancing the traffic between cells after shutdown and after activation:
• Service and Load Based Handover• Direct RRC Connection Setup• HSPA Capability Based Handover
9 © Nokia Siemens Networks 2012
BTS Power Saving Mode
Service and Load Based Handover
Direct RRC Connection
Setup
HSPA Capability Based Handover
Technical DetailsRAN955 Power Saving Mode
10 © Nokia Siemens Networks 2012
RAN955 Power Saving Mode
Technical Details
• RAN955 BTS Power Saving Mode allow operator to define cells that can be shutdown by RNC when the cell traffic is below predefined level.
• There are the following parameters are taken into consideration for cell shout down/activating:
Cells shutdown order
Cells that can be shutdown
RAN955 main configuration
11 © Nokia Siemens Networks 2012
Traffic in the active cell(s)
Traffic in the cell to be shout down and duration of low traffic
Time period (within cell can be shutdown) configuration options
Technical Details
• Cells in one BTS can be grouped for Power Saving Mode (PWSM) purposes. The cells in PWSM group typically have coverage in the same sector.
• Shutdown Order (SO) parameter defines the order in which the cells are shut down within one PWSM group.
• Shutdown Order value 0 is reserved for the remaining cell which is typically the cell not to be shut down. Also, the last remaining cells can be configured to be shut down. Total BTS shut down can be a feasible solution in special cases, for example in the indoor office environment with macro cell coverage from another BTS
12 © Nokia Siemens Networks 2012
coverage from another BTS
Frequency 1
Frequency 2
Frequency 3
Cell1 F1 SO = 1Cell3 F2 SO = 2Cell6 F3 SO = 0
PWSM Cell Group 1
Cell2 F1 SO = 1Cell4 F2 SO = 2Cell7 F3 SO = 0
PWSM Cell Group 2
Cell3 F1 SO = 1Cell5 F2 SO = 2Cell8 F3 SO = 0
PWSM Cell Group 3
BTS
Cell3 F1 SO = 1Cell5 F2 SO = 2Cell8 F3 SO = 0
Shutdown order, “0” – remaining cell
Technical Details
• RNC monitors the load in downlink and uplink directions and triggers the cell shutdown once all the following operator adjustable conditions have been met in a cell:
• time of day• no emergency calls or Wireless Priority Service calls in cell• traffic load in the cell going below the defined threshold• duration of low traffic• remaining cells not in high load• UEs served by another RNC enabled or not present, according to operator definition
13 © Nokia Siemens Networks 2012
• Prior to the cell switch-off in BTS, the cell is barred. The RNC sends NBAP: Cell Deletion -command to the BTS. During cell deletion the existing traffic is moved to other cells.
RNCBTS
NBAP: Cell Deletion
NBAP: Cell Deletion Response
Technical Details
• Cell shutdown procedure• RNC based on criteria's mentioned on previous slide decides to shutdown cell
RNCBTS
Cell is barred
14 © Nokia Siemens Networks 2012
NBAP: Cell Deletion
Removal of all channels in the cell
Gradual CPICH power rump down
New traffic is not accepted in the cell
Handover for UEs in the cell (initiated by UEs due
to low CPCH power)
Forced hard handover for remaining UE is the cell
Cell is shutdown due to Power Saving Mode
NBAP: Cell Deletion Response
Technical Details
• The usage of gradual power ramp-down in Cell Deletion procedure is recommended to be used. • During gradual common pilot channel (CPICH) power ramp-down, the UE initiates a soft handover
branch removal. • Also during or after gradual CPICH power ramp-down the RNC detects a need for handover (inter-
frequency or intersystem handover) and start the inter-frequency or inter-system handover procedure.
• The gradual power ramp-down is the basis of the UE management in Cell Deletion procedure and therefore it is recommended to be used.
• After CPICH power decrease, RNC performs forced inter-frequency handover for the remaining UEs. • When the gradual CPICH power ramp-down is used, the success rate of branch removals and inter-
frequency/inter-system handovers is increased (the number of lost calls during cell shutdown is
15 © Nokia Siemens Networks 2012
frequency/inter-system handovers is increased (the number of lost calls during cell shutdown is smaller because of the RNC capability to handle simultaneous inter-frequency/inter-system handovers). Also the number of remaining UEs in a cell is lower.
CPICH power of the cell to be shutdown
Cell to be removed from Active Set due to low CPICH power
UE remaining in the cell, inter-frequency/inter-system handover needed
ParametersRAN955 Power Saving Mode
16 © Nokia Siemens Networks 2012
RAN955 Power Saving Mode
ParametersRAN955 Power Saving Mode
Parameter name Abbreviated name ObjectThe PWSM usage in BTS PWSMInUse WBTS
PWSM Shutdown Time Begin Hour for remaining cell
PWSMRemCellSDBeginHour WBTS
PWSM Shutdown Time Begin Hour for remaining cell
PWSMRemCellSDBeginMin WBTS
PWSM Shutdown Time End Hour for remaining cell
PWSMRemCellSDEndHour WBTS
PWSM Shutdown Time End Hour for remaining cell
PWSMRemCellSDEndMin WBTS
Hour when the cell shutdownwindow starts
PWSMShutdownBeginHourWBTS
Minute when the cell shutdownwindow starts
PWSMShutdownBeginMin WBTS
17 © Nokia Siemens Networks 2012
window startsPWSMShutdownBeginMin WBTS
Hour when the cell shutdownwindow ends
PWSMShutdownEndHour WBTS
Minute when the cell shutdownwindow ends
PWSMShutdownEndMin WBTS
Weekday for shutdown PWSMWeekday WBTS
The PWSM cell group of a cell PWSMCellGroup WCELThe shutdown order of cells in
one PWSM cell groupPWSMShutdownOrder WCEL
Shutdown of a remaining cell PWSMShutdownRemCell WCELTime limit for traffic to active a
shutdown cellPWSMExceededTrafficDur RNC
Duration of low traffic for cell shutdown
PWSMDuration RNC
Cell shutdown allowed with drifting UE
PWSMDriftAllowed RNC
RAN955 BTS Power Saving Mode related parametersPWSM usage in BTS
Abbreviated name PWSMInUse
Parameter name PWSM usage in BTS
Data type -
Description This parameter defines the PWSM usage in the BTS. Use of Power Saving Modefor BTS is controlled at the BTS level. This parameter sets the PowerSaving Mode (PWSM) feature ON and OFF at the level of the BTS.
Parameter group -
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Classification Radio Resource Utilization
Range and step 0 (OFF), 1 (ON)
Default value 0 (OFF)
BTS Power Saving Mode feature activation/deactivation
RAN955 BTS Power Saving Mode related parametersHour when the cell shutdown window starts
Abbreviated name PWSMShutdownBeginHour
Parameter name Hour when the cell shutdown window starts
Data type -
Description This parameter defines the starting hour for cell shutdown window in Power SavingMode (PWSM)
Parameter group -
Classification Radio Resource Utilization
19 © Nokia Siemens Networks 2012
Classification Radio Resource Utilization
Range and step 0..23, 1
Default value 22
Frequency 1
Frequency 2
Frequency 3Shutdown cells
- Remaining cells
Starting hour for cell shutdown window (PWSM) for remaining cell(s)
RAN955 BTS Power Saving Mode related parametersMinute when the cell shutdown window starts
Abbreviated name PWSMShutdownBeginMin
Parameter name Minute when the cell shutdown window starts
Data type -
Description This parameter defines the starting minute for cell shutdown window in PowerSaving Mode (PWSM)
Parameter group -
Classification Radio Resource Utilization
20 © Nokia Siemens Networks 2012
Classification Radio Resource Utilization
Range and step 0..59, 1
Default value 0
Frequency 1
Frequency 2
Frequency 3Shutdown cells
- Remaining cells
Starting minute for cell shutdown window (PWSM) for remaining cell(s)
RAN955 BTS Power Saving Mode related parametersHour when the cell shutdown window ends
Abbreviated name PWSMShutdownEndHour
Parameter name Hour when the cell shutdown window ends
Data type -
Description This parameter defines the ending hour for cell shutdown window in Power SavingMode (PWSM).
Parameter group -
Classification Radio Resource Utilization
21 © Nokia Siemens Networks 2012
Classification Radio Resource Utilization
Range and step 0..23, 1
Default value 6
Frequency 1
Frequency 2
Frequency 3Shutdown cells
- Remaining cells
Starting hour for cell shutdown window (PWSM) for remaining cell(s)
RAN955 BTS Power Saving Mode related parametersMinute when the cell shutdown window ends
Abbreviated name PWSMShutdownEndMin
Parameter name Minute when the cell shutdown window ends
Data type -
Description This parameter defines the ending minute for cell shutdown window in PowerSaving Mode (PWSM).
Parameter group -
Classification Radio Resource Utilization
22 © Nokia Siemens Networks 2012
Classification Radio Resource Utilization
Range and step 0..59, 1
Default value 0
Frequency 1
Frequency 2
Frequency 3Shutdown cells
- Remaining cells
Starting minute for cell shutdown window (PWSM) for remaining cell(s)
RAN955 BTS Power Saving Mode related parametersWeekend for shutdown
Abbreviated name PWSMWeekday
Parameter name Weekend for shutdown
Data type -
Description This parameter defines the days on which the remaining cells should be shut downat weekend.
Parameter group -
Classification Radio Resource Utilization
23 © Nokia Siemens Networks 2012
Classification Radio Resource Utilization
Range and step 0 (None), 1 (Saturday), 2 (Sunday), (Saturday and Sunday)
Default value 0
Defines whether PWSM should be activated weekend days (Saturday /Sunday)
RAN955 BTS Power Saving Mode related parametersThe PWSM cell group of a cell
Abbreviated name PWSMCellGroup
Parameter name The PWSM cell group of a cell.
Data type -
Description This parameter defines the Power Saving Mode (PWSM) cell group of a cell.
Parameter group -
Classification Radio Resource Utilization
24 © Nokia Siemens Networks 2012
Range and step 0 ...6, 1 / special value 0 – the cell does not belong to any group of cells
Default value 0
Cell1 F1 SO = 1Cell3 F2 SO = 2Cell6 F3 SO = 0
PWSM Cell Group 1
Cell2 F1 SO = 1Cell4 F2 SO = 2Cell7 F3 SO = 0
PWSM Cell Group 2
Cell3 F1 SO = 1Cell5 F2 SO = 2Cell8 F3 SO = 0
PWSM Cell Group 3
BTS
PWSM Cell Group 2
PWSM Cell Group 1
PWSM Cell Group 3
RAN955 BTS Power Saving Mode related parametersThe shutdown order of cells in one PWSM cell group
Abbreviated name PWSMShutdownOrder
Parameter name The shutdown order of cells in one PWSM cell group
Data type -
Description This parameter defines the shutdown and activation order inside one Power SavingMode (PWSM) cell group.
Parameter group -
Classification Radio Resource Utilization
25 © Nokia Siemens Networks 2012
Classification Radio Resource Utilization
Range and step 0 ...3, 1 / special value 0 – the cell is a remaining cell in PWSM
Default value 0
Cell1 F1 SO = 1Cell3 F2 SO = 2Cell6 F3 SO = 0
PWSM Cell Group 1
Cell2 F1 SO = 1Cell4 F2 SO = 2Cell7 F3 SO = 0
PWSM Cell Group 2
Cell3 F1 SO = 1Cell5 F2 SO = 2Cell8 F3 SO = 0
PWSM Cell Group 3
BTS
Frequency 2
Frequency 3
Cells to be shutdown
- Remaining cells
Frequency 1
Shutdown order
RAN955 BTS Power Saving Mode related parametersShutdown of a remaining cell
Abbreviated name PWSMShutdownRemCell
Parameter name Shutdown of a remaining cell
Data type -
Description This parameter determines if a remaining cell can be shutdown or not.
Parameter group -
Classification Radio Resource Utilization
26 © Nokia Siemens Networks 2012
Range and step 0 (No), 1 (Yes)
Default value 0 (No)
Frequency 1
Frequency 2
Frequency 3Shutdown cells
- Remaining cells
RAN955 BTS Power Saving Mode related parametersPWSM Shutdown Time Begin Hour for remaining cell
Abbreviated name PWSMRemCellSDBeginHour
Parameter name PWSM Shutdown Time Begin Hour for remaining cell
Data type -
Description This parameter defines the starting hour for cell shutdown window in Power SavingMode (PWSM) for remaining cell.
Parameter group -
Classification Radio Resource Utilization
27 © Nokia Siemens Networks 2012
Classification Radio Resource Utilization
Range and step 0..23, 1
Default value 22
Frequency 1
Frequency 2
Frequency 3Shutdown cells
- Remaining cells
Starting hour for cell shutdown window (PWSM) for remaining cell(s)
RAN955 BTS Power Saving Mode related parametersPWSM Shutdown Time Begin Minute for remaining cell
Abbreviated name PWSMRemCellSDBeginMin
Parameter name PWSM Shutdown Time Begin Minute for remaining cell
Data type -
Description This parameter defines the starting minute for cell shutdown window in PowerSaving Mode (PWSM) for remaining cell.
Parameter group -
Classification Radio Resource Utilization
28 © Nokia Siemens Networks 2012
Classification Radio Resource Utilization
Range and step 0..59, 1
Default value 0
Frequency 1
Frequency 2
Frequency 3Shutdown cells
- Remaining cells
Starting minute for cell shutdown window (PWSM) for remaining cell(s)
RAN955 BTS Power Saving Mode related parametersPWSM Shutdown Time End Hour for remaining cell
Abbreviated name PWSMRemCellSDEndHour
Parameter name PWSM Shutdown Time End Hour for remaining cell
Data type -
Description This parameter defines the ending hour for the cell shutdown window in PowerSaving Mode (PWSM) for the remaining cell.
Parameter group -
Classification Radio Resource Utilization
29 © Nokia Siemens Networks 2012
Classification Radio Resource Utilization
Range and step 0..23, 1
Default value 6
Frequency 1
Frequency 2
Frequency 3Shutdown cells
- Remaining cells
Starting hour for cell shutdown window (PWSM) for remaining cell(s)
RAN955 BTS Power Saving Mode related parametersPWSM Shutdown Time End Minute for remaining cell
Abbreviated name PWSMRemCellSDEndMin
Parameter name PWSM Shutdown Time End Hour for remaining cell
Data type -
Description This parameter defines the ending minute for the cell shutdown window in PowerSaving Mode (PWSM) for the remaining cell.
Parameter group -
Classification Radio Resource Utilization
30 © Nokia Siemens Networks 2012
Classification Radio Resource Utilization
Range and step 0..59, 1
Default value 0
Frequency 1
Frequency 2
Frequency 3Shutdown cells
- Remaining cells
Starting minute for cell shutdown window (PWSM) for remaining cell(s)
RAN955 BTS Power Saving Mode related parametersTime limit for traffic to activate a shutdown cell
Abbreviated name PWSMExceededTrafficDur
Parameter name Time limit for traffic to activate a shutdown cell
Data type -
Description This parameter defines the time that at least one active cell in one Power SavingMode (PWSM) cell group needs to have traffic criteria fulfilled in order to activate apreviously shutdown cell.
Parameter group -
31 © Nokia Siemens Networks 2012
Classification Radio Resource Utilization
Range and step 10..300, 10
Default value 20
Unit seconds
time
Traffic per cell
Time to active a shutdown cell
Shutdown cell activation
RAN955 BTS Power Saving Mode related parametersDuration of low traffic for cell shutdown
Abbreviated name PWSMDuration
Parameter name Duration of low traffic for cell shutdown
Data type -
Description This parameter defines the time period when the shutdown criteria for low traffichave to be fulfilled in order to shutdown a cell.
Parameter group -
Classification Radio Resource Utilization
32 © Nokia Siemens Networks 2012
Classification Radio Resource Utilization
Range and step 1..30, 1
Default value 1
Unit minutes
time
Traffic per cell
Time to active a shutdown cell Cell shutdown
RAN955 BTS Power Saving Mode related parametersCell shutdown allowed with drifting UE
Abbreviated name PWSMDriftAllowed
Parameter name Cell shutdown allowed with drifting UE
Data type -
Description This parameter determines whether the cell shutdown is allowed with drifting UEsor not. If there are drifting UEs in a cell and the parameter has value NO, then thecell cannot be shutdown.
Parameter group -
33 © Nokia Siemens Networks 2012
Classification Radio Resource Utilization
Range and step 0 (No), 1 (Yes)
Default value 0 (No)
RAN955 BTS Power Saving Mode related parameters RAN955 Power Saving Mode
Parameter name Abbreviated name ObjectLimit for NRT HSDPA PWSMAVLimitNRTHSDPA WCEL
RT DCH power limit for activation
PWSMAVLimitRTDCH WCEL
Limit for RT HSDPA PWSMAVLimitRTHSDPA WCELRT HSDPA power limit for
activationPWSMAVLimitRTHSDPA WCEL
NRT HSDPA power per user limit
PWSMAVPwrNRTHSDPA WCEL
Power limit for virtual AC PWSMEXPwrLimit WCEL
User limit for virtual AC PWSMEXUsrLimit WCELNRT DCH limit for shutdown PWSMSDLimitNRTDCH WCELRT DCH limit for shutdown PWSMSDLimitRTDCH WCEL
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RT DCH limit for shutdown PWSMSDLimitRTDCH WCELLimit for NRT HSDPAa PWSMSDLimitNRTHSDPA WCEL
Limit for RT HSDPAa PWSMSDLimitRTHSDPA WCELNRT HSDPA power per user
marginPWSMSDPwrNRTHSDPA WCEL
RT HSDPA power per user margin
PWSMSDPwrRTHSDPA WCEL
RT DCH power per user margin PWSMSDPwrRTDCH WCEL