WCDMA_RAN955 Power Saving Mode.pdf

RAN955 BTS Power Saving Mode

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Outline General Introduction Interdependencies Technical Details Network Parameters KPIs and Counters User scenarios/ Use Cases

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General Introduction RAN955 BTS Power Saving Mode

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Brief Introduction & Benefits of RAN955 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: •

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Opex savings to operator during low traffic periods due to power savings

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General Release Information on RAN955 Release Information WCDMA Release

Supplementary O&M Information

RU20

I-HSPA System BTS (Flexi) NetAct HW Requirements UE Release

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WBTS6.0 OSS5.2 Flexi Rel1, Flexi rel.2, Ultra, EUBB -

Common O&M Platform Feature

No

BSW/ASW

ASW

RAS SW Component

RAN

License Control

Long term ON/OFF license control

With and Without RAN955 RAN955

RAN955

Not activated

Activated

Power savings related to switched off cells with low load conditions (e.g. nights hours) Continuous service availability within green area

Power consumption during low load conditions (e.g. nights hours)

Time

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Interdependencies RAN955 Power Saving Mode

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Requirements of RAN955 There are no feature requirements connected with RAN955

RAN955 BTS Power Saving Mode

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Requirements of RAN955 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

RAN955 BTS Power Saving Mode

Service and Load Based Handover

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Direct RRC Connection Setup

HSPA Capability Based Handover

Technical Details RAN955 Power Saving Mode

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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 that can be shutdown Cells shutdown order Time period (within cell can be shutdown) Traffic in the cell to be shout down and duration of low traffic Traffic in the active cell(s)

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RAN955 main 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.

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Shutdown Order (SO) parameter defines the order in which the cells are shut down within one PWSM group.

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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 Frequency 1

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

Cell2 F1 SO = 1 Cell4 F2 SO = 2 Cell7 F3 SO = 0

Cell3 F1 SO = 1 Cell5 F2 SO = 2 Cell8 F3 SO = 0

Frequency 2 Frequency 3

PWSM Cell Group 1

PWSM Cell Group 2

PWSM Cell Group 3

BTS Cell3 F1 SO = 1 Cell5 F2 SO = 2 Cell8 F3 SO = 0 12

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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

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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.

NBAP: Cell Deletion NBAP: Cell Deletion Response BTS

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RNC

Technical Details •

Cell shutdown procedure • RNC based on criteria's mentioned on previous slide decides to shutdown cell

RNC

BTS

Cell is barred New traffic is not accepted in the cell

NBAP: Cell Deletion Handover for UEs in the cell (initiated by UEs due to low CPCH power)

Gradual CPICH power rump down

Forced hard handover for remaining UE is the cell Removal of all channels in the cell

NBAP: Cell Deletion Response 14

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Cell is shutdown due to Power Saving Mode

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 (interfrequency 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 interfrequency/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 15

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UE remaining in the cell, inter-frequency/intersystem handover needed

Parameters RAN955 Power Saving Mode

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Parameters RAN955 Power Saving Mode Parameter name The PWSM usage in BTS PWSM Shutdown Time Begin Hour for remaining cell PWSM Shutdown Time Begin Hour for remaining cell PWSM Shutdown Time End Hour for remaining cell PWSM Shutdown Time End Hour for remaining cell Hour when the cell shutdown window starts Minute when the cell shutdown window starts Hour when the cell shutdown window ends Minute when the cell shutdown window ends Weekday for shutdown The PWSM cell group of a cell The shutdown order of cells in one PWSM cell group Shutdown of a remaining cell Time limit for traffic to active a shutdown cell Duration of low traffic for cell shutdown Cell shutdown allowed with drifting UE

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Abbreviated name PWSMInUse

Object WBTS

PWSMRemCellSDBeginHour

WBTS

PWSMRemCellSDBeginMin

WBTS

PWSMRemCellSDEndHour

WBTS

PWSMRemCellSDEndMin

WBTS

PWSMShutdownBeginHour

WBTS

PWSMShutdownBeginMin

WBTS

PWSMShutdownEndHour

WBTS

PWSMShutdownEndMin

WBTS

PWSMWeekday PWSMCellGroup

WBTS WCEL

PWSMShutdownOrder

WCEL

PWSMShutdownRemCell

WCEL

PWSMExceededTrafficDur

RNC

PWSMDuration

RNC

PWSMDriftAllowed

RNC

RAN955 BTS Power Saving Mode related parameters PWSM 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 Mode for BTS is controlled at the BTS level. This parameter sets the Power Saving 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

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RAN955 BTS Power Saving Mode related parameters Hour 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 Saving Mode (PWSM)

Parameter group

-

Classification

Radio Resource Utilization

Range and step

0..23, 1

Default value

22 Frequency 1

- Remaining cells

Frequency 2 Frequency 3

Shutdown cells

Starting hour for cell shutdown window (PWSM) for remaining cell(s) 19

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RAN955 BTS Power Saving Mode related parameters Minute 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 Power Saving Mode (PWSM)

Parameter group

-

Classification

Radio Resource Utilization

Range and step

0..59, 1

Default value

0 Frequency 1

- Remaining cells

Frequency 2 Frequency 3

Shutdown cells

Starting minute for cell shutdown window (PWSM) for remaining cell(s) 20

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RAN955 BTS Power Saving Mode related parameters Hour 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 Saving Mode (PWSM).

Parameter group

-

Classification

Radio Resource Utilization

Range and step

0..23, 1

Default value

6 Frequency 1

- Remaining cells

Frequency 2 Frequency 3

Shutdown cells

Starting hour for cell shutdown window (PWSM) for remaining cell(s) 21

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RAN955 BTS Power Saving Mode related parameters Minute 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 Power Saving Mode (PWSM).

Parameter group

-

Classification

Radio Resource Utilization

Range and step

0..59, 1

Default value

0 Frequency 1

- Remaining cells

Frequency 2 Frequency 3

Shutdown cells

Starting minute for cell shutdown window (PWSM) for remaining cell(s) 22

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RAN955 BTS Power Saving Mode related parameters Weekend 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 down at weekend.

Parameter group

-

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)

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RAN955 BTS Power Saving Mode related parameters The 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

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 2

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

Cell2 F1 SO = 1 Cell4 F2 SO = 2 Cell7 F3 SO = 0

Cell3 F1 SO = 1 Cell5 F2 SO = 2 Cell8 F3 SO = 0

PWSM Cell Group 1

PWSM Cell Group 2

PWSM Cell Group 3

PWSM Cell Group 3

BTS PWSM Cell Group 1 24

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RAN955 BTS Power Saving Mode related parameters The 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 Saving Mode (PWSM) cell group.

Parameter group

-

Classification

Radio Resource Utilization

Range and step

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

Default value

0 Shutdown order

Cell1 F1 SO = 1 Cell3 F2 SO = 2 Cell6 F3 SO = 0 PWSM Cell Group 1

Cell2 F1 SO = 1 Cell4 F2 SO = 2 Cell7 F3 SO = 0 PWSM Cell Group 2

Cell3 F1 SO = 1 Cell5 F2 SO = 2 Cell8 F3 SO = 0

Frequency 1 Frequency 2

PWSM Cell Group 3 Frequency 3

BTS 25

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Cells to be shutdown - Remaining cells

RAN955 BTS Power Saving Mode related parameters Shutdown 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

Range and step

0 (No), 1 (Yes)

Default value

0 (No)

Frequency 1

- Remaining cells

Frequency 2 Frequency 3

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Shutdown cells

RAN955 BTS Power Saving Mode related parameters PWSM 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 Saving Mode (PWSM) for remaining cell.

Parameter group

-

Classification

Radio Resource Utilization

Range and step

0..23, 1

Default value

22 Frequency 1

- Remaining cells

Frequency 2 Frequency 3

Shutdown cells

Starting hour for cell shutdown window (PWSM) for remaining cell(s) 27

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RAN955 BTS Power Saving Mode related parameters PWSM 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 Power Saving Mode (PWSM) for remaining cell.

Parameter group

-

Classification

Radio Resource Utilization

Range and step

0..59, 1

Default value

0 Frequency 1

- Remaining cells

Frequency 2 Frequency 3

Shutdown cells

Starting minute for cell shutdown window (PWSM) for remaining cell(s) 28

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RAN955 BTS Power Saving Mode related parameters PWSM 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 Power Saving Mode (PWSM) for the remaining cell.

Parameter group

-

Classification

Radio Resource Utilization

Range and step

0..23, 1

Default value

6 Frequency 1

- Remaining cells

Frequency 2 Frequency 3

Shutdown cells

Starting hour for cell shutdown window (PWSM) for remaining cell(s) 29

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RAN955 BTS Power Saving Mode related parameters PWSM 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 Power Saving Mode (PWSM) for the remaining cell.

Parameter group

-

Classification

Radio Resource Utilization

Range and step

0..59, 1

Default value

0 Frequency 1

- Remaining cells

Frequency 2 Frequency 3

Shutdown cells

Starting minute for cell shutdown window (PWSM) for remaining cell(s) 30

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RAN955 BTS Power Saving Mode related parameters Time 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 Saving Mode (PWSM) cell group needs to have traffic criteria fulfilled in order to activate a previously shutdown cell.

Parameter group

-

Classification

Radio Resource Utilization

Range and step

10..300, 10

Default value

20

Unit

seconds

Traffic per cell

Time to active a shutdown cell 31

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Shutdown cell activation

time

RAN955 BTS Power Saving Mode related parameters Duration 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 traffic have to be fulfilled in order to shutdown a cell.

Parameter group

-

Classification

Radio Resource Utilization

Range and step

1..30, 1

Default value

1

Unit

minutes

Traffic per cell

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Time to active a shutdown cell

Cell shutdown

time

RAN955 BTS Power Saving Mode related parameters Cell 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 UEs or not. If there are drifting UEs in a cell and the parameter has value NO, then the cell cannot be shutdown.

Parameter group

-

Classification

Radio Resource Utilization

Range and step

0 (No), 1 (Yes)

Default value

0 (No)

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RAN955 BTS Power Saving Mode related parameters RAN955 Power Saving Mode Parameter name Limit for NRT HSDPA RT DCH power limit for activation Limit for RT HSDPA RT HSDPA power limit for activation NRT HSDPA power per user limit Power limit for virtual AC User limit for virtual AC NRT DCH limit for shutdown RT DCH limit for shutdown Limit for NRT HSDPAa Limit for RT HSDPAa NRT HSDPA power per user margin RT HSDPA power per user margin RT DCH power per user margin

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Abbreviated name PWSMAVLimitNRTHSDPA

Object WCEL

PWSMAVLimitRTDCH

WCEL

PWSMAVLimitRTHSDPA

WCEL

PWSMAVLimitRTHSDPA

WCEL

PWSMAVPwrNRTHSDPA

WCEL

PWSMEXPwrLimit PWSMEXUsrLimit PWSMSDLimitNRTDCH PWSMSDLimitRTDCH PWSMSDLimitNRTHSDPA PWSMSDLimitRTHSDPA

WCEL WCEL WCEL WCEL WCEL WCEL

PWSMSDPwrNRTHSDPA

WCEL

PWSMSDPwrRTHSDPA

WCEL

PWSMSDPwrRTDCH

WCEL