WCDMA_RAN955 Power Saving Mode.pdf

RAN955 BTS Power Saving Mode

1 © Nokia Siemens Networks 2012

Outline

General Introduction

Interdependencies

Technical Details

Network Parameters

KPIs and Counters


User scenarios/ Use Cases

General IntroductionRAN955 BTS Power Saving Mode


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


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


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


InterdependenciesRAN955 Power Saving Mode


RAN955 Power Saving Mode

Requirements of RAN955

There are no feature requirements connected with RAN955

RAN955BTS Power Saving


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


BTS Power Saving Mode

Service and Load Based Handover

Direct RRC Connection

Setup

HSPA Capability Based Handover

Technical DetailsRAN955 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


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


coverage from another BTS

Frequency 1

Frequency 2

Frequency 3

Cell1 F1 SO = 1Cell3 F2 SO = 2Cell6 F3 SO = 0

PWSM Cell Group 1


PWSM Cell Group 2


PWSM Cell Group 3

BTS


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


• 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


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


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



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


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 -


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 -




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 -





Default value 0

Frequency 1

Frequency 2


- 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 -





Default value 6

Frequency 1

Frequency 2


- Remaining cells


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 -





Default value 0

Frequency 1

Frequency 2


- Remaining cells


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 -




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 -



Range and step 0 ...6, 1 / special value 0 – the cell does not belong to any group of cells

Default value 0


PWSM Cell Group 1


PWSM Cell Group 2


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 -




Range and step 0 ...3, 1 / special value 0 – the cell is a remaining cell in PWSM

Default value 0


PWSM Cell Group 1


PWSM Cell Group 2


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 -



Range and step 0 (No), 1 (Yes)

Default value 0 (No)

Frequency 1

Frequency 2


- 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 -





Default value 22

Frequency 1

Frequency 2


- Remaining cells


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 -





Default value 0

Frequency 1

Frequency 2


- Remaining cells


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 -





Default value 6

Frequency 1

Frequency 2


- Remaining cells


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 -





Default value 0

Frequency 1

Frequency 2


- Remaining cells


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 -




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 -





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 -



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


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

Documents

WCDMA_RAN955 Power Saving Mode.pdf