05. RAN971 HSUPA Downlink Physical Channel Power Control

7/25/2019 05. RAN971 HSUPA Downlink Physical Channel Power Control

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1 Nokia Siemens Networks

RU30 WorkshopRAN971 HSUPA Downlink Physical Channel Power

Control

Krishnan Iyer

Nokia Siemens NetworksT-Mobile RU30 Deep Dive

10/27/2011


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Release Information

Motivation and Benefits

Feature Dependencies

Feature Description

Contents


3/15

RAN971 HSUPA Downlink Physical Channel Power ControlRelease Information

WCDMA Release RU40

BTS (Flexi) WBTS8.0

BSW/ASW BSW

HW Requirements Flexi Rel2


4/15

RAN971 HSUPA Downlink Physical Channel Power ControlMotivation and Benefits

Brief description:

This feature introduce power control for following downlink physical controlchannels:

E-DCH Absolute Grant Channel (E-AGCH)

E-DCH Relative Grant Channel (E-RGCH)

E-DCH Hybrid ARQ Indicator Channel (E-HICH)

Fractional Dedicated Physical Channel (F-DPCH)

Controlling the transmit powers of the HSUPA downlink control channels based onthe feedback received from UE

Motivation and benefits:

Reduction of average downlink power need

The coverage area for 2ms E-DCH TTImay be increased


5/15

RAN971 HSUPA Downlink Physical Channel Power ControlFeature Dependencies(1/2)

Requires:

Applicable if HSUPA is configured and activated:

RAN 826 Basic HSUPA

RAN 968 HSUPA BTS Packet Scheduler

RAN 973 HSUPA Basic RRM

RAN1016Flexi BTS Rel-2 Multimode System Module (Flexi BTS)

RAN 971

RAN 826

RAN 968

RAN 973

RAN 1016


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RAN971 HSUPA Downlink Physical Channel Power ControlFeature Dependencies(2/2)

Recommendation:

Using together with RAN 1644 Continuous Packet ConnectivityInterdependencies:

RAN 2124 HSPA 128 users per cell (scheduler) requires RAN971 otherwise128 users can not be achieved.

RU20 and earlier RAN:

Power in HSUPA Downlink Physical Channel is controlled through PowerOffsets between HSUPA DL channels and CPICH or DPCCH. This approach

assure that channels are properly received by UE.

RAN 1644

RAN 2124

RAN 971


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Feature Description


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RAN971 HSUPA Downlink Physical Channel Power ControlPower Offsets in RU10

Transmitted Power in HSUPA Downlink Physical channels is controlledthrough Power Offsets between HSUPA DL channels and CPICH

Parameter

NameAbbreviated Name 3GPP Name Short Description

Range

and Step

Default

Value

The

transmissionpower offset of

the E-HICH

PtxOffsetEHICH E-HICHPower Offset

This parameter defines the

transmission power of the E-HICH in relation to the

transmission power of the

primary CPICH

-32..31.75dB step

0.25 dB

-11dB

The

transmission

power offset of

the E-AGCH

PtxOffsetEAGCHE-AGCH

Power Offset


transmission power of the E-

AGCH in relation to the


primary CPICH

-32..31.75

dB step

0.25 dB

-5dB

The

transmission

power offset

of the E-

RGCH

PtxOffsetERGCHE-RGCH

Power Offset



E-RGCH in relation to the


primary CPICH

-32..31.75

dB step

0.25 dB

-11dB


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RAN971 HSUPA Downlink Physical Channel Power ControlPower Offsets in RU20

Parameter

NameAbbreviated Name 3GPP name Short Description

Range and

Step

Default

Value

The power

offset of the E-

HICH

PtxOffsetEHICHDPCC

H

E-HICH Power

Offset


transmission power of the E-

DCH HARQ Acknowledgement

Indicator Channel. E-HICHpower is defined in relation to

the pilot bits on the DL DPCCH

-32...31.75

step 0.25-4 dB

The power offset

of the E-AGCH

PtxOffsetEAGCHDPCC

H

E-AGCH

Power Offset


transmission power of the E-DCH

Absolute Grant Channel. E-AGCH

power is defined in relation to the

pilot bits on the DL DPCCH

-32...31.75 step

0.253 dB

The power offsetof the E-RGCH

PtxOffsetERGCHDPCCH

E-RGCHPower Offset


transmission power of the E-DCHRelative Grant Channel. E-RGCH

power is defined in relation to the

pilot bits on the DL DPCCH

-32...31.75 step0.25

-6 dB

F-DPCH

maximum

transmission

power

PtxFDPCHMaxMaximum DL

Power

This parameter defines maximum

power for TPC bits of Fractional

DPCH (F-DPCH). Value of the

parameter is subtracted from RNP

parameter Ptx- PriCPICH

-5...30

Step 0.1dB9dB

Transmitted Power in HSUPA Downlink Physical Channel is controlledthrough Power Offsets between HSUPA DL channels and DL DPCCH


10/15

RAN971 HSUPA Downlink Physical Channel Power ControlPower Offsets

Inner and outer loop algorithms will deliver a

power reference value(Pref) Outer loop on basis of ACK/NACK

provides value of power which is required

to maintain quality of communication

at the required level

Inner loop adjusts value of power to

current radio condition Transmitted power for particular

DL physical control channels is

calculated taking into account as well

power offsets for DL HSUPA channels:

E-RGCH Power Offset

E-AGCH Power Offset

E-HICH Power Offset

CQI

DL TPC

L1 HSPAACKs &

NACKs

Power offsets

Of DL HSPA

Physical control

channels

DL Power

Control

Inner Loop

+

Outer Loop

Tx Power

F-DPCH

Tx Power

E-HICH

Tx Power

E-RGCH

Tx Power

E-AGCH


11/15

RAN971 HSUPA Downlink Physical Channel Power ControlOutput Parameters

As result are obtained values of Tx power

for fol lowing channel: E-DCH Absolute Grant Channel

E-DCH Relative Grant Channel

E-DCH Hybrid ARQ Indicator Channel

Fractional Dedicated Physical Channel

PE-RGCH= Pref+ E-RGCH Power Offset

PE-AGCH= Pref+ E-AGCH Power Offset

PE-HICH= Pref + E-HICH Power Offset

PF-DPCH= Pref

CQI

DL TPC

L1 HSPA

ACKs &

NACKs

Power offsets

Of DL HSPA

Physical control

channels

DL Power

Control

Inner Loop

+

Outer Loop

Tx Power

F-DPCH

Tx Power

E-HICH

Tx Power

E-RGCH

Tx Power

E-AGCH


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NodeB Tx Power

0.00

5.00

10.00

15.00

20.00

25.00

30.00

35.00

Distance from NodeB [km]

Txpower[dBm]

CP ICH E -A GCH E -E GCH/ E-HICH

Power control for HSUPA DL control channels in RU10Performance(1/2) : Power Control

E-AGCH Power Offset E-RGCH Power Offset /

E-HICH Power Offset

Tx power forHSUPA DL

control channels is

constant

Without feature


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RAN971 HSUPA Downlink Physical Channel Power ControlPerformance(2/2) : Power Control

Tx power for

HSUPA DL

control channels

is controlled.

Value of Tx power

is changed and is

incremented for

the UE which are

at a biggerdistance from the

NodeB

With feature

NodeB Tx Power Level

-10.00

-5.00

0.00

5.00

10.00

15.00

20.00

25.00

30.00

35.00

0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 1.1 1.2 1.3 1.369

UE Distance from NodeB [km]

NodeB

TxPowerLev

el[dBm]

CPICH E-AGCH E-RGCH/E-HICH


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RAN971 HSUPA Downlink Physical Channel Power ControlPerformance Monitoring

New KPIs presented by feature:

a) HSUPA DL Power utilization distribution (x% .. y%)= Average HSUPA DL controlchannel power per user utilization in class x

b) Average HSUPA DL power per user = average power of HSUPA DL controlchannels / average number of HSUPA users

Performance improvements could be verified by KPIs and counters

related to:

HSDPA Throughput

DL Power Utilization

Number of CS Voice over HSPA users


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RAN971 HSUPA Downlink Physical Channel Power ControlPerformance Monitoring

Six new counters are proposed for reporting HSUPA DL control power in

BTS: AVG_HSUPA_DL_PWR_RATIO_DIST_CLASS_01 ( 0 ..

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05. RAN971 HSUPA Downlink Physical Channel Power Control