power control

WCDMA RAN

Power ControlFeature Parameter Description

Copyright © Huawei Technologies Co., Ltd. 2010. All rights reserved.

No part of this document may be reproduced or transmitted in any form or by any means without prior written consent of HuaweiTechnologies Co., Ltd.

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and other Huawei trademarks are the property of Huawei Technologies Co., Ltd. All other trademarks and trade namesmentioned in this document are the property of their respective holders.

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The purchased products, services and features are stipulated by the commercial contract made between Huawei and the customer.All or partial products, services and features described in this document may not be within the purchased scope or the usage scope.Unless otherwise agreed by the contract, all statements, information, and recommendations in this document are provided “AS IS”without warranties, guarantees or representations of any kind, either express or implied.

The information in this document is subject to change without notice. Every effort has been made in the preparation of this documentto ensure accuracy of the contents, but all statements, information, and recommendations in this document do not constitute thewarranty of any kind, express or implied.

11/27/12 RAN Feature Documentation

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Contents1 Introduction

1.1 Scope

1.2 Intended Audience

1.3 Change History

2 Overview of Power Control

3 Common Channel Power Control

3.1 Power Control on Uplink Common Channel

3.2 Power Control on Downlink Common Channels

4 Dedicated Channel Power Control

4.1 Open Loop Power Control

4.1.1 Uplink Open Loop Power Control on DPCH

4.1.2 Downlink Open Loop Power Control on DPCH

4.1.3 Downlink Open Loop Power Control on F-DPCH

4.2 Inner Loop Power Control

4.2.1 Uplink Inner Loop Power Control in Normal Mode on DPCH

4.2.2 Uplink Inner Loop Power Control in Compressed Mode on DPCH

4.2.3 Downlink Inner Loop Power Control in Normal Mode on DPCH/F-DPCH

4.2.4 Downlink Inner Loop Power Control in Compressed Mode on DPCH/F-DPCH

4.3 Outer Loop Power Control

4.3.1 Uplink Outer Loop Power Control Based on BLER

4.3.2 Uplink Outer Loop Power Control Based on BER

4.3.3 Downlink Outer Loop Power Control

5 HSDPA Power Control

5.1 Power Control on HS-DPCCH

5.2 Power Control on HS-SCCH

5.2.1 Power Control on HS-SCCH in CELL_DCH

5.2.2 Power Control on HS-SCCH in Enhanced CELL_FACH

6 HSUPA Power Control

6.1 Power Control on E-DPCCH

6.2 Power Control on E-DPDCH

6.3 E-DCH Outer Loop Power Control

6.4 Power Control on E-AGCH, E-RGCH, and E-HICH

6.4.1 Overview

6.4.2 Power Control Based on Fixed Power

6.4.3 Power Control Based on Downlink DPCH/F-DPCH

6.4.4 HSUPA E-AGCH Power Control (Based on CQI or HS-SCCH)

7 Downlink Power Balance

8 Parameters

9 Counters

10 Glossary

11 Reference Documents

1 Introduction

http://127.0.0.1:52199/hedex/pages/GE11229S/04/GE11229S/04/resources/Power%20Control.htm?ft=0&id=GE11229S_04_10021#_Toc274559576











































1.1 Scope

This document describes the power control feature. It covers common channel power control, dedicated channel powercontrol, and HSPA power control.

1.2 Intended Audience

This document is intended for:

Personnel who are familiar with WCDMA basics

Personnel who need to understand power control

Personnel who work with Huawei products

1.3 Change History

This section provides information on the changes in different document versions.

There are two types of changes, which are defined as follows:

Feature change: refers to the change in the power control feature.

Editorial change: refers to the change in wording or the addition of the information that was not described in the earlierversion.

Document Issues

The document issues are as follows:

01 (2010-03-30)

Draft (2009-12-05)

01 (2010-03-30)

This is the document for the first commercial release of RAN12.0.

Compared with issue Draft (2009-12-05) of RAN12.0, this issue incorporates the changes described in the following table.

Change Type Change Description Parameter Change

Feature changeThe information about power control on E-DPDCH is optimized. For details, see 6.2”Power Control on E-DPDCH”.

The subparameterPC_CFG_ED_POWER_INTERPOLATION_SWITCH of PcSwitch is added.

Editorialchange

None. None.

Draft (2009-12-05)

This is the draft of the document for RAN12.0.

Compared with issue 02 (2009-06-30) of RAN11.0, this issue incorporates the changes described in the following table.

Change Type Change Description Parameter Change

Feature change None. None.

Editorial change The information on power control on HS-SCCH inenhanced CELL_FACH is added. For details, see 5.2“Power Control on HS-SCCH.”

None.

The description of uplink outer loop power control basedon BELR is optimized. For details, see 4.3.1 “Uplink OuterLoop Power Control Based on BLER.”

None.

2 Overview of Power Control

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The WCDMA system is an interference-limited system, and the most important way to restrain system interference is powercontrol. The power control is performed by the UE and UTRAN to adjust and control the power of transmitting signalsaccording to changes of the channel conditions and quality of received signals. The uplink and downlink power isminimized while ensuring Quality of Service (QoS).

Uplink and Downlink Power Control

The main purpose of power control is to decrease interference to other UEs and to lower UE transmit power.

In the uplink, a UE emitting too high power will cause unacceptable competing interference on the NodeB in comparisonto signals coming from UEs at the cell edge. This is called near-far effect. To avoid near-far effect, uplink power controlis required.

In the downlink, the system capacity is determined by the total code power. Therefore, it is necessary to keep thetransmit power at the lowest possible level while still ensuring signal quality at the UE.

Power control is also used to compensate for shadow and fast fading as well as power drift. By using power control tocompensate for power drift, soft handover performance in the downlink is improved. The Downlink Power Balance (DPB)algorithm is introduced to reduce the power drift between links when the UE is in soft or softer handover.

Power Control Types

Power control is classified into the following types:

Open loop power control (WRFD-020501 Open Loop Power Control)

At open loop power control, the initial transmit power is calculated. The UE estimates the power loss of signals on thepropagation path by measuring the downlink channel signals and then calculates the initial transmit power of the uplinkchannel. This method is rather inaccurate and it is only applied at the beginning of a connection setup. Open loop powercontrol is applied on physical channels such as PRACH and DPCH.

Closed loop power control

At closed loop power control, the transmitter dynamically adjusts its transmit power according to the feedback from thereceiver of the other side. Closed loop power control is further classified into the following types:

− Inner loop power control (WRFD-020504 Inner Loop Power Control)

Inner loop power control directly adjusts the transmit power of the transmitter by using power control commands. Innerloop power control is a fast power control method and can be performed 1,500 times per second.

− Outer loop power control (WRFD-020503 Outer Loop Power Control)

SIR target is dynamically adjusted according to the uplink BLER/BER/FER. Outer loop power control indirectly controlsthe transmit power of the transmitter.

This document describes power control of the common channels, dedicated channels, HSDPA channels, and HSUPAchannels. HS-PDSCH power is dynamically allocated by the HSDPA power resource management and thus the HS-PDSCHis not described here.

3 Common Channel Power Control

Common channels consist of the PRACH in the uplink and the P-CPICH, P-SCH, S-SCH, P-CCPCH, S-CCPCH, AICH, andPICH in the downlink. Only open loop power control is used on these common channels.

3.1 Power Control on Uplink Common Channel

The Physical Random Access Channel (PRACH) is the only common channel on which the uplink open loop power controlis applied.

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The process of power control on the PRACH is as follows:

1. The UE transmits the first preamble to the NodeB to start an access process.

The power of the first preamble is computed with the following formula:

Preamble_Initial_Power = PCPICHPower - CPICH_RSCP + UL interference + Constantvalue

Where:

− The PCPICHpower parameter defines the P-CPICH transmit power in a cell.

− CPICH_RSCP is the received signal code power of the P-CPICH.

− UL interference is the uplink Received Total Wideband Power (RTWP).

− The Constantvalue parameter for calculating the initial transmit power compensates for the RACH processing gain. Itis broadcast in SIB 5.

2. If no acquisition indicator is received by the UE, a preamble ramping procedure starts. To avoid collisions, the UE mustwait for a time between two consecutive preambles. The waiting time is configured by AICHTxTiming on the RNC. Thepower of preamble is increased for each retransmission by a power ramp step configured by PowerRampStep on theRNC.

3. If the UE receives a negative acquisition indicator on the AICH, the UE waits for a certain period and then initiates therandom access procedure again. This period is called the back-off delay. The parameters NB01min and NB01maxdefine the lower and upper limits of the back-off delay. If the value of NB01min is equal to that of NB01max, it meansthat the retransmission period of the preamble part is fixed.

A preamble ramping procedure consists of several preamble ramping cycles, which cannot exceed Mmax. In each cycle,the UE retransmits the preamble until the UE receives the acquisition indicator or the number of retransmissions hasreached PreambleRetransMax.

4. If the UE receives a positive acquisition indicator, the UE exits the random access procedure, sets the power for themessage part, and transmits the message part after a period configured by AICHTxTiming.

The message part consists of two parts: the control part and the data part. The power of the control part is the same asthe power of the last transmitted preamble plus a value defined by the PowerOffsetPpm parameter. PowerOffsetPpmmust be set for each instance of PRACH TFC.

It is recommended that the value of PowerOffsetPpm be set to -3 dB corresponding to the TFC for signalingtransmission and be set to -2 dB corresponding to the TFC for service transmission.

If the value of PowerOffsetPpm is set too small, it is likely that the signaling or the service data carried over the RACHcannot be correctly received, which affects the uplink coverage. If the value is set too large, the uplink interference isincreased, and the uplink capacity is affected.

The power of the data part is calculated with the following formula:

Pdata = Pcontrol x (βd/βc)2

Where:

− Pcontrol is the power for the control part.

− βd is the power gain factor for the data part. The value is defined by the GainFactorBetaD parameter.

− βc is the power gain factor for the control part. The value is defined by the GainFactorBetaC parameter.

The transmit power on the PRACH cannot be greater than the maximum allowed uplink transmit power. This maximumpower is limited by the following parameters configured on the RNC:

MaxUlTxPowerforConv (conversational)l



MaxUlTxPowerforBac (background)

MaxUlTxPowerforInt (interactive)

MaxUlTxPowerforStr (streaming)

MaxAllowedUlTxPower

Larger values increase coverage of corresponding service type. If the values of these parameters are too large, there is arisk the uplink and downlink coverage of related service will become unbalanced. If the values of these parameters are toosmall, there is a risk the uplink coverage will become smaller than the downlink coverage of the service. If there is nospecial requirement, use the default values.

3.2 Power Control on Downlink Common Channels

This section describes how much power is allocated to downlink common channels.

The downlink common channels are as follows:

Primary Common Pilot Channel (P-CPICH)

Primary Synchronization Channel (P-SCH)

Secondary Synchronization Channel (S-SCH)

Primary Common Control Physical Channel (P-CCPCH)

Secondary Common Control Physical Channel (S-CCPCH)

Acquisition Indicator Channel (AICH)

Paging Indicator Channel (PICH)

The power of downlink common channels is fixed and can be configured on the RNC by the parameters listed in thefollowing table:

Parameter Description

PCPICHPower The P-CPICH power is set through the PCPICHPower parameter as an absolutevalue in dBm. The transmit power of any other channel is an offset from the P-CPICH power. P-CPICH transmit power is related to the downlink coveragedefined during network planning.

If the value of this parameter is too small, it will directly influence the downlink pilotcoverage range.

If it is too large, the downlink interference will increase, and the transmit powerthat can be distributed to the services will be reduced, which will affect thedownlink capacity.

In addition, the configuration of this parameter has influence on the distribution ofhandover areas.

PSCHPower

SSCHPower

The values of PSCHPower and SSCHPower must not be too large. Theparameter values can be adjusted based on the measurement in the actualenvironment, so that the transmit power of the synchronization channels satisfiesthe UE reception and demodulation requirements.

The transmit power should be just enough to ensure that a UE can implement fastsynchronization in most areas of the cell edge. Neither the P-SCH nor the S-SCHcomes through channel code spectrum spreading, so they produce more seriousinterference than other channels, especially for near-end UEs.

BCHPower The BCHPower parameter is set based on the measurement in the actualenvironment. If the value of this parameter is too small, the UEs at the cell edgewill fail to receive the system information correctly, and the downlink coverage willbe influenced. If the value is too large, other channels are affected and the cellcapacity will be reduced.

MaxFachPower Set the value of the MaxFachPower parameter to a value that is just enough toensure the target BLER. If the value of this parameter is too small, the UEs at thecell edge will fail to receive correctly the services and signaling carried over theFACH, which results in influence on the downlink coverage. If it is too large, otherchannels will be affected and the cell capacity will be reduced.

In addition, when the downlink power is overloaded, MaxFachPower may bechanged. For the related function, see the Load Control Feature ParameterDescription.

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PCHPower If the value of this parameter is too small, the UEs at the cell edge will fail toreceive paging messages correctly, which will influence cell coverage. If it is toolarge, other channels will be affected and the cell capacity will be reduced.

AICHPowerOffsetEnsure that all UEs at the cell edge can receive the access indication. To avoidwasting power, the transmit power should not be too large.

PICHPowerOffset If the value of this parameter is too small, the UEs at the cell edge will fail toreceive paging indicators correctly, which will affect the downlink coverage. If it istoo large, other channels will be affected and the cell capacity will be reduced.

4 Dedicated Channel Power Control

Dedicated channels consist of the DPCH in the uplink and the DPCH and the F-DPCH in the downlink. Uplink DPCHsconsist of the uplink DPCCH and the uplink DPDCH, and they use different OVSF codes. Downlink DPCHs consist of thedownlink DPCCH and DPDCH, and they use the same OVSF code by time division multiplexing.

Dedicated channel power control methods are open loop power control, inner loop power control, and outer loop powercontrol.

Open loop power control provides initial power of channels.

Inner loop power control adjusts channel power by comparing the SIR of the received signal with the SIR target.

Outer loop power control adjusts the SIR target by comparing the BLER target and the BLER of the received DCH.

Figure 4-1 shows an example of uplink dedicated channel power control.

Figure 4-1 Uplink dedicated channel power control

4.1 Open Loop Power Control

Based on the measurement of received downlink signal power, open loop power control attempts to make a coarseestimation of the path loss and based on this provide initial power for the UE and NodeB.

4.1.1 Uplink Open Loop Power Control on DPCH

The uplink open loop power control on the DPCH is to calculate the initial power of the first DPCCH. The initial power of theDPDCH is calculated based on the power offset between the DPCCH and the DPDCH.

Initial power of Uplink DPCCH

The UE calculates the initial power with the following formula:

DPCCH_Initial_Power = DPCCH_Power_Offset - CPICH_RSCP

Where:

DPCCH_Initial_Power is the initial power.

DPCCH_Power_Offset is provided by the RNC and sent to the UE.

CPICH_RSCP is the received signal code power of the P-CPICH.

The DPCCH_Power_Offset is calculated by the RNC with the following formula:

DPCCH_Power_Offset = PCPICHPower + Uplink interference + DefaultConstantValue

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Where:

DPCCH_Power_Offset is the power offset of the DPCCH.

The PCPICHPower parameter defines the P-CPICH transmit power in a cell. This value is broadcast in SIB 5.

Uplink interference is the uplink RTWP measured by the NodeB and sent to the UE through the SIB 7.

The DefaultConstantValue parameter is used to set the power offset of the DPCCH to a conservative level to avoidexcessive uplink interference.

Power of Uplink DPDCH

The power of the uplink DPDCH is set as a power offset (βd/βc) reference to the uplink DPCCH. The uplink DPCCH and

DPDCHs are transmitted through different channel codes. To meet a given QoS requirement on the transport channels,different TFCs use different power offsets.

The RNC has a set of reference values (βc,ref and βd,ref) that are stored for each predefined Radio Access Bearer (RAB)

or Signaling Radio Bearer (SRB). βc,ref and βd,ref can be configured by BETAC and BETAD on the RNC.

The RNC calculates a new power offset for each TFC based on the reference values dynamically and sends the poweroffset to the UE.

In an RAB combination, all the radio bearers use the reference values of the bearer who has the maximum bit rate. Forexample, for the combination of 3.4 kbit/s SRB service, 384 kbit/s background service, and 12.2 kbit/s AMR service, thereference power offset values applied are those belonging to the 384 kbit/s background radio bearer.

Preamble of Uplink DPCCH Power Control

An uplink DPCCH Power Control (PC) preamble is a segment of uplink DPCCH transmission that is sent before the start ofthe uplink DPDCH transmission. The PC preamble is used to ensure that the inner loop power control has convergedbefore the transmission of DPDCH data starts. The RNC transfers the PC preamble parameter (number of DPCCHpreamble timeslots) to the UE by using RRC signaling. The UE does not send any data on SRBs during the frames ofpreambles and frames indicated in the SRB delay IE.

Depending on application scenarios, different values for the length of PC preamble and SRB delay are used as follows:

In the case of RRC connection establishment, the length of PC preamble is zero frames and SRB delay is seven frames.

In the case of hard handover, the length of PC preamble is seven frames and SRB delay is also seven frames.

When the DPCCH PC preamble has been transmitted and the SRB delay passed, the UE starts transmitting data on theDPDCH at initial transmit power.

4.1.2 Downlink Open Loop Power Control on DPCH

Downlink open loop power control on the DPCH is to calculate the DPDCH power based on the measurement results in theRACH IE from the UE. The DPCCH power is set as the power offset reference to the DPDCH.

Initial Power of Downlink DPDCH

The RNC uses the P-CPICH power, the traffic rate requested by the UE, measured Ec/No on CPICH and the downlinktransmitted carrier power as input in calculating the initial power of downlink DPDCH.

During soft handover, the initial power of the new radio link is decreased by a power offset of 15 dB to save downlinkpower. The decrease is valid only when PC_DOWNLINK_POWER_BALANCE_SWITCH of the PcSwitch parameter isselected.

The power of the downlink DPDCH is limited for each radio link through the RlMaxDlPwr and RlMinDlPwr parameters.The values of the RlMaxDlPwr and RlMinDlPwr parameters are different for different data rates of RABs.

Power of Downlink DPCCH

The downlink DPCCH consists of three fields: TFCI, TPC, and pilot. Their power is set as the offset reference to the powerof the downlink DPDCHs.

The downlink power on the DPCCH and its associated DPDCHs is simultaneously regulated. Thus, power control adjuststhe power of the DPCCH and DPDCHs with the same step, and the power offset between the DPCCH and the DPDCHkeeps constant.

Power offsets between the DPCCH and the DPDCH in the downlink are identical for all TFCs in the TFCS, whereas in theuplink the power offsets are TFC-dependent.

The power offsets of TFCI, TPC and pilot fields of the DPCCH reference to the power of DPDCHs are fixed to 0 dB, 3 dB,and 3 dB respectively.

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4.1.3 Downlink Open Loop Power Control on F-DPCH

Open loop power control on the F-DPCH uses the P-CPICH power, the downlink transmitted carrier power, measuredEc/No on CPICH and the Ec/No required for satisfying the TPC symbol error rate of the F-DPCH as input in calculating theinitial power of downlink F-DPCH.

During soft handover, the initial power of the new radio link is decreased by a power offset of 15 dB to save downlinkpower. The decrease is valid only when PC_DOWNLINK_POWER_BALANCE_SWITCH of the PcSwitch parameter isselected.

The power of the downlink F-DPCH is limited by the maximum power (PCPICHPower + FdpchMaxRefPwr + FdpchPO2)and minimum power (PCPICHPower + FdpchMinRefPwr + FdpchPO2).

4.2 Inner Loop Power Control

Inner loop power control is also called fast power control. The UE or NodeB controls the transmit power according to thepower control information returned from the receiver, to compensate for the fading of radio links.

Inner loop power control consists of uplink inner loop power control and downlink inner loop power control, which workindependently. The inner loop power control may work in normal mode or compressed mode.

4.2.1 Uplink Inner Loop Power Control in Normal Mode on DPCH

Uplink inner loop power control is used on the DPCCH. The power of the relative DPDCHs is configured as the poweroffset ((βd/βc) reference to the power of the DPCCH. For details of the DPDCH, see section "Uplink Open Loop Power

Control on DPCH."

The procedure of inner loop power control on the uplink DPCCH is as follows:

1. The RNC sends an SIR target, denoted as SIRtarget, to the cells in the active set.

2. Each cell in the active set estimates the SIR, denoted as SIRest, at each timeslot and compares it with the SIRtarget.

3. The cell in the active set sends a TPC command to the UE based on the comparison result.

− If SIRest is larger than SIRtarget, the cell in the active set sends a TPC command 0 to the UE.

− If SIRest is smaller than or equal to SIRtarget, the cell in the active set sends a TPC command 1 to the UE.

4. The UE adjusts the transmit power according to the TPC command.

There are two types of inner loop power control algorithms: PCA1 and PCA2. The UE uses the algorithms to translate thereceived TPC commands. The RNC can select the algorithm based on the configuration of the PwrCtrlAlg parameter andinform the UE of the selected algorithm.

When using the PCA1, the UE adjusts the uplink transmit power for every timeslot. When using the PCA2, the UE adjuststhe uplink transmit power in a 5-timeslot cycle. The power increment/reduciton is calculated with the following formula:

ΔDPCCH = ΔTPC x TPC_cmd

Where:

ΔDPCCH is power increment/reduction on the DPCCH.

TPC_cmd is calculated by the PCA1 or PCA2 according to the TPC command received by the UE.

ΔTPC is the step of power control. For PCA1, it is determined by UlTpcStepSize . For PCA2, the step is fixed to 1 dB.

4.2.2 Uplink Inner Loop Power Control in Compressed Mode on DPCH

The power control method in compressed mode is similar to that in normal mode, and it aims at restoring the SIR to the SIRtarget as quickly as possible after each transmission gap, to avoid block errors during and after the compressed frames.To achieve this restoration, the power control increases the power and the SIR target used in the UE.

Adjusting SIR Target

During the transmission gap, the cells in the active set does not estimate the SIR and generate TPC commands. The SIRtarget used in compressed mode will be increased to compensate for the interruption due to transmission gaps.

The compressed and non-compressed frames in uplink DPCCH may have a different number of pilots per slot. In thecompressed frame, the number of pilots per slot is decreased. So the SIR target used in compressed mode need take thechange of the number of pilot bits into consideration. The compensated SIR target for the change of the number of pilotbits is calucated by the following formula:

ΔSIRPILOT = 10Log10 (Npilot,N/Npilot,curr_frame)

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Where:

ΔSIRPILOT is the compensated SIR target.

Npilot,curr_frame is the number of pilot bits per timeslot in the current uplink frame.

Npilot,N is the number of pilot bits per timeslot in a normal uplink frame without a transmission gap.

The SIR target in compressed mode equals to the sum of SIR target in normal mode and the compensated SIR target.

Adjusting Power

The UE uses ΔDPCCH to adjust the UE uplink DPCCH transmit power on each timeslot in compressed mode.

ΔDPCCH = ΔTPC x TPC_cmd + ΔPILOT

Where:

ΔDPCCH is power increment/reduction.

ΔTPC is the step of power control.

TPC_cmd is calculated from TPCs by the PCA algorithm

ΔPILOT = 10Log10 (Npilot,prev/Npilot,curr)

Where:

− Npilot,prev is the number of pilot bits in the previous transmitted timeslot.

− Npilot,curr is the number of pilot bits in the current timeslot.

Table 4-1 provides the comparison between uplink inner loop power control in normal and compressed modes.

Table 4-1 Comparison between uplink inner loop power control in normal and compressed modes

Entity Normal Mode Compressed Mode

Cell in theactive set

SIRest > SIRtarget, TPC command = 0

SIRest < SIRtarget, TPC command = 1

SIRest > SIRcm_target, TPC command = 0

SIRest < SIRcm_target, TPC command = 1

UE ΔDPCCH = ΔTPC x TPC_cmd ΔDPCCH = ΔTPC x TPC_cmd + ΔPILOT

ΔPILOT = 10Log10 (Npilot,prev/Npilot,curr)

4.2.3 Downlink Inner Loop Power Control in Normal Mode on DPCH/F-DPCH

The power of the downlink DPDCH is set as the offset reference to the power of the DPCCH. Therefore, downlink innerloop power control regulates the power of the DPCCH and DPDCH together. For details of the offset, see section 4.1.2"Downlink Open Loop Power Control on DPCH."

The procedure of downlink inner loop power control is as follows:

1. The UE obtains the SIR target from the RNC, which is denoted as SIRtarget.

The SIRtarget is determined by outer loop power control. For a downlink F-DPCH, the SIRtarget is set automatically by the

UE based on the error rate target of TPC command sent from the UTRAN .

2. The UE estimates the downlink SIR from the pilot symbols of the downlink DPCH, expressed as SIRest, and comparesthe SIRest with the SIRtarget.

3. Based on the comparison result, the UE transmits a TPC command to the NodeB.

− If SIRest is larger than SIRtarget, the UE sends a TPC command 0 to the NodeB.

− If SIRest is smaller than SIRtarget, the UE sends a TPC command 1 to the NodeB.

The UE sends a TPC command to the NodeB periodically, the interval is decided by the DpcMode parameter. When theDpcMode parameter is set to SINGLE_TPC, the UE sends a TPC command for every timeslot; when DpcModeparameter is set to TPC_TRIPLET_IN_SOFT, the UE sends a TPC command in a 3-timeslot cycle; when DpcModeparameter is set to TPC_AUTO_ADJUST, the interval can be adjusted automatically by sending the ACTIVE SETUPDATE message to the UE.

4. The UTRAN estimates the transmitted TPC and updates the DPCH power every timeslot.

In the case of softer handover, the NodeB uses the Maximum Ratio Combining (MRC) algorithm to derive a combinedTPC command.

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The UTRAN calculates the power adjustment with the following formula:

P(k) = P(k-1) + PTPC(k) + Pbal(k)

Where:

P(k) is the new downlink power.

P(k-1) is the current downlink power.

PTPC(k) is the kth power adjustment due to the received TPC of inner loop power control.

Pbal(k) is a correction due to the downlink power balance. In the scenario of a single radio link, Pbal is equal to 0. For

details, see section 7 "Downlink Power Balance."

The PTPC(k) is calculated as follows:

If PC_INNER_LOOP_LMTED_PWR_INC_SWITCH of the PcSwitch parameter is set to OFF, then the following formulais used:

If the TPC is equal to 1, the power is increased by ΔTPC.

If the TPC is equal to 0, the power is decreased by ΔTPC.

ΔTPC is determined by FddTpcDlStepSize . TPCest is the estimated TPC.

If PC_INNER_LOOP_LMTED_PWR_INC_SWITCH of the PcSwitch parameter is set to ON, then the following formula isused:

If the TPC is equal to 1, and the sum of Δsum(k) and ΔTPC is smaller than Power_Raise_Limit, the power is increased by

ΔTPC.

If the TPC is equal to 1, and the sum of Δsum(k) and ΔTPC is larger than or equal to Power_Raise_Limit, the power is

not adjusted.

If the TPC is equal to 0, the power is decreased by ΔTPC.

Where:

− Δsum(k) is the sum of inner loop power increment/reduction within 20 timeslots.

− Power_Raise_Limit is fixed to 10 dB.

4.2.4 Downlink Inner Loop Power Control in Compressed Mode on DPCH/F-DPCH

The power control method in compressed mode is similar to that in normal mode, and it aims at restoring the SIR to the SIRtarget as quickly as possible after each transmission gap, to avoid block errors during and after the compressed frames.To achieve this restoration, the power control increases the power and the SIR target used in the UE.

Adjusting SIR Target

The calculation method of the downlink SIR target in compressed mode is similar with that of uplink. The RNC usescompression method and the position of transmission timeslot in the current frame as input in calculating SIR target in thecompressed mode.

Adjusting Power

The power of the DPCCH and DPDCH in the first timeslot after the transmission gap should be set to the same value asthat in the timeslot just before the transmission gap.

In compressed mode, the UTRAN estimates the power with the following formula:

P(k) = P(k-1) + PTPC(k) + PSIR(k) + Pbal(k)

Where:

P(k) is the new power.

P(k-1) is the current downlink power.

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PTPC(k) is the kth power adjustment due to the received TPC of the inner loop power control.

PSIR(k) is the kth power adjustment due to the downlink target SIR variation.

For the F-DPCH, the power offset PSIR(k) = 0.

Pbal(k) is a correction due to downlink power balance.

Table 4-2 provides the comparison between downlink inner loop power control in normal and compressed modes.

Table 4-2 Comparison between downlink inner loop power control in normal and compressed modes

Entity Normal Mode Compressed Mode

UE SIRest > SIRtarget, TPCcommand = 0

SIRest < SIRtarget, TPCcommand = 1

SIRest > SIRcm_target, TPC command = 0

SIRest < SIRcm_target, TPC command = 1

NodeB P(k) = P(k-1) + PTPC(k) +Pbal(k)

P(k) = P(k-1) + PTPC(k) + PSIR(k) + Pbal(k)

4.3 Outer Loop Power Control

The outer loop power control (OLPC) is a part of the closed loop power control and the aim is to maintain thecommunication quality at the level required by the service bearer through adjustment of the SIR target. This power controlacts on each DCH belonging to the same RRC connection.

The SIR target needs to be adjusted when the UE speed or the multi-path propagation environment changes, so that thecommunication quality can remain unaffected.

The adjustment of the SIR target is based on the BLER or bit error rate (BER).

When PC_OLPC_SWITCH of the PcSwitch parameter is set to ON, there are two cases:

− If there is data transfer in the uplink, the SRNC adjusts the SIR target based on the BLER.

− If there is no data transfer in the uplink, the SRNC adjusts the SIR target based on the BER.

When PC_OLPC_SWITCH of the PcSwitch parameter is set to OFF, the SIR target is fixed and the uplink outer looppower control for all UEs is deactivated.

Downlink outer loop power control is implemented by the UE. Therefore, downlink outer loop power control is determinedby the UE manufacturer.

4.3.1 Uplink Outer Loop Power Control Based on BLER

The uplink quality is observed after macro diversity selection combining in the RNC. Therefore, uplink outer loop powercontrol is performed in the SRNC.

Figure 4-2 Uplink outer loop power control

The SRNC compares the received BLER with the BLER target. If the received BLER is larger than the BLER target, theSRNC increases the SIR target. Otherwise, the SRNC decreases the SIR target.

SIR target is adjusted per steps. In an outer loop power control adjustment period, the maximum increase/decrease mustnot exceed a specified value, and SIR target must not exceed the upper threshold and lower threshold.

For different traffic classes, the adjustment step, maximum increase, maximum decrease, upper threshold, and lowerthreshold of SIR target vary. Therefore, such variables are automatically configured by the RNC according to the trafficclass.

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In case of multi-service:

The maximum value of the SIR target among multiple services is used for the SIR target adjustment.

If one of the services requires increase in the SIR target, the reconfigured SIR target cannot exceed that maximumvalue.

The maximum value can be decreased only when all the services require decrease in the SIR target.

After adjusting the SIR target, the SRNC sends the new SIR target through Frame Protocol (FP) frames to all NodeBsunder the SRNC for uplink inner loop power control.

The initial SIR target value is service-dependent and is provided by the RNC to the NodeB.

4.3.2 Uplink Outer Loop Power Control Based on BER

The OLPC based on the BER is similar to the OLPC based on the BLER, but the BER is used as the control object. Whenthe UE is in discontinuous transmission (DTX) mode, the RNC cannot receive data or update the BLER. Therefore, theBER is used to solve this problem.

In an optimal condition, the BER target is the average BER after filtering within the adjustment period. The BER target isobtained before the DTX period starts during the outer loop power control period. During soft handover, the BER target isthe minimum value among all the links. When the BLER is a constant, the BER on the DPCCH can vary within a limitedrange.

During the DTX, the MAC measures the BER on the DPCCH, and the RNC compares it with the BER target. If themeasured BER is smaller than the BER target, the OLPC decreases the SIR target. Otherwise, the OLPC increases theSIR target.

4.3.3 Downlink Outer Loop Power Control

Downlink outer loop power control is implemented by the UE. Therefore, this algorithm is UE manufacturer specific.

The information signaled to the UE by the RNC is a quality target for each radio bearer, expressed as a BLER target.Then, depending on the manufacturer specific outer loop power control algorithm, an initial SIR target value can bededuced from this BLER value.

5 HSDPA Power Control

This chapter describes the feature WRFD-01061004 HSDPA Power Control.

Physical channels introduced by HSDPA are the HS-DPCCH in the uplink and the HS-SCCH and HS-PDSCH in thedownlink.

In the following situation, the power of the HS-PDSCH is dynamically allocated by TFRC and does not require the functionof power control.

The UE is in the CELL_DCH state.

The UE is in the enhanced CELL_FACH state and the HS-PDSCH carries the DTCH, DCCH or CCCH.

For detailed information about TFRC, see HSDPA Feature Parameter Description.

When the UE is in the enhanced CELL_FACH state and the HS-PDSCH carries the BCCH, the power of the HS-PDSCH isdetermined by the offset relative to the P-CPICH power. The offset is specified by the parameter BcchHspdschPower.

This section mainly introduces the HS-DPCCH power control and HS-SCCH power control.

5.1 Power Control on HS-DPCCH

Overview

The power of the HS-DPCCH is set by several power offsets between the HS-DPCCH and the associated uplink DPCCH.The power offsets consist of the ACK power offset, NACK power offset, and CQI power offset, as shown in Figure 5-1. Thepower offsets are set at each HS-DPCCH TTI.

Figure 5-1 Power Control on HS-DPCCH

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The HS-DPCCH transmit power is calculated with the following formula:

PHS-DPCCH = PUL DPCCH x 10ΔHS-DPCCH/10

Where:

PUL DPCCH is the transmit power of the associated uplink DPCCH.

ΔHS-DPCCH refers to the power offset of ACK, NACK, or CQI, that is, the power difference between the ACK/NACK/CQIand the uplink DPCCH.

The power offsets of ACK and NACK are related to the ACK/NACK repetition factor and HS-DPCCH preamble transmissionindication. The power offset of CQI is related to the CQI repetition factor and CQI repetition period.

A preamble and a postamble are transmitted before and after the NACK/ACK feedback respectively to improve theACK/NACK decoding reliability. The transmit power of the first timeslot of the HS-DPCCH ACK/NACK can decrease toreduce the interference in the uplink.

ACK/NACK /CQI Power Offset

The power offset is related to the number of RLSs and the repetition factor. DPCCHs have macro diversity gains, but theHS-DPCCH does not have. Therefore, the more links a UE in the soft handover state has, the larger the power offsetshould be set. The greater the repetition factor is, the smaller the power offset should be set.

RNC automatically set ACK/NACK power offset and CQI power set according to the UE capability and the number of RLSsin the active set.

Repetition Factors

Repetition factors of ACK/NACK and CQI are signaled to the UE and NodeB from the RNC. The UE does not attempt toreceive or decode transport blocks from the HS-DSCH subframes during the UE ACK or NACK retransmission.

CQI Feedback Cycle

The CQI feedback cycle is signaled to the UE and NodeB from the RNC.

5.2 Power Control on HS-SCCH

Power control on the HS-SCCH consists of power control on the HS-SCCH in the CELL_DCH state and that in theenhanced CELL_FACH state.

5.2.1 Power Control on HS-SCCH in CELL_DCH

The power control method for the HS-SCCH in CELL_DCH can be fixed (fixed transmit power control) or CQI-based(dynamic transmit power control). The method is specified by the parameter HSSCCHPWRCMINDCH.

Fixed transmit power control: The power of the HS-SCCH is determined by the offset relative to the P-CPICH power. Theoffset is specified by the parameter SCCHPWR. The transmit power of the HS-SCCH is fixed without consideration of thechannel quality but with consideration of the receive quality of UEs at the cell edge.

Dynamic transmit power control based on CQI: The NodeB dynamically adjusts the transmit power of the HS-SCCHbased on the following information to improve the resource usage in the downlink.

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− CQI reported by the UE

− DTX detected by the NodeB

− Target FER of the HS-SCCH, which can be set by the HSSCCHFERTRGTINDCH parameter on the NodeB

5.2.2 Power Control on HS-SCCH in Enhanced CELL_FACH

When the UE is in the enhanced CELL_FACH state, its data and control information can be transmitted through the HS-PDSCH and HS-SCCH. The UE in the enhanced CELL_FACH state has no dedicated connection with the physical layer ofthe NodeB, and the UE does not quickly report the CQI, ACK, or NACK to the NodeB. Therefore, the function for HS-SCCHpower control needs to be modified.

When the UE is in the enhanced CELL_FACH state and the HS-PDSCH carries the BCCH, the power of the HS-SCCH isdetermined by the offset relative to the P-CPICH power. The offset is specified by the parameter BcchHsscchPower.

When the UE is in the enhanced CELL_FACH state and the HS-PDSCH carries the user data, the power control methodfor the HS-SCCH can be fixed (fixed transmit power control) or CQI-based (dynamic transmit power control). The methodis specified by the parameter HsScchPwrCMInEfach.

− Fixed transmit power control: The power of the HS-SCCH is determined by the offset relative to the P-CPICH power.The offset is specified by the parameter BcchHsscchPower.

− Dynamic transmit power control based on CQI: The NodeB converts the measured CPICH Ec/No into CQI, based onwhich the transmit power of the HS-SCCH is estimated.

Because there is no corresponding interface for the UE to report the measured CPICH Ec/No to the NodeB, the UE obtains the measuredCPICH Ec/No and reports the value to the RNC, and then the RNC assigns the measured CPICH Ec/No to the NodeB over the HS-DSCH.

6 HSUPA Power Control

This chapter describes the feature WRFD-01061203 HSUPA Power Control.

6.1 Power Control on E-DPCCH

The transmit power on the E-DPCCH is calculated using a power offset reference to the uplink DPCCH with the followingformula:

PE-DPCCH = PUL DPCCH x A2ec

Where:

PUL DPCCH is the transmit power of the uplink DPCCH.

Aec is the quantized amplitude ratio of the E-DPCCH to the uplink DPCCH, which is set to 15/15 for a 2 ms TTI and 9/15

for a 10 ms TTI.

6.2 Power Control on E-DPDCH

The transmit power on the E-DPDCH is calculated using a power offset reference to the uplink DPCCH with the followingformula:

PE-DPDCH = PUL DPCCH x A2ed

Where:

PUL DPCCH is the transmit power of the uplink DPCCH.

Aed is the power offset of the E-DPDCH reference to the uplink DPCCH. The UE computes the power offset through

power extrapolation formula or power interpolation formula. Compared with extrapolation formula, the interpolationformula can satisfy higher demodulation requirement for high speed services.

The extrapolation formula will be used only when the following conditions are met:

− The parameter PcSwitch: PC_CFG_ED_POWER_INTERPOLATION_SWITCH is set to 1.

− The UE complies with 3GPP Release 7 or later releases.

− The typical variables to support extrapolation formula are configured.

If the previous conditions are not met, the interpolation formula will be used.

For detailed information about power extrapolation formula and power interpolation formula, see 3GPP TS 25.214.

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6.3 E-DCH Outer Loop Power Control

The outer loop power control (OLPC) on the E-DCH is used to adjust the transmit power on the E-DPDCH and to keep theQoS of the E-DCH on the required level.

The QoS on the E-DCH is obtained after the RNC performs a macro diversity combination. Since only the correct packetsare sent to the RNC from the NodeB, the number of HARQ retransmissions is used as the measurement for the E-DCHQoS. The OLPC periodically adjusts the SIR target, related to the service QoS for the E-DCH, in a similar way for the DCH.

The control object of OLPC can be the number of retransmissions (NHR) or the residual BLER (RBLER).

If the service is interactive/background/streaming/SRB, NHR is the control object of OLPC.

If the service is PS conversational, RBLER is the control object of OLPC.

6.4 Power Control on E-AGCH, E-RGCH, and E-HICH

6.4.1 Overview

In the downlink, HSUPA has three additional control channels: E-AGCH, E-RGCH, and E-HICH. The following power controlmethods are used:

Power Control Based on Fixed Power

Power Control Based on Downlink DPCH/F-DPCH , including power control based on TPC and power control based onpilot

HSUPA E-AGCH Power Control (Based on CQI or HS-SCCH), including power control based on CQI and power controlbased on HS-SCCH

The power control methods can be configured on the NodeB for each channel through the following parameters:

EAGCHPCMOD (E-AGCH power control mode)

NSEHICHPCMOD (non-serving E-HICH power control mode)

SEHICHPCMOD (serving E-HICH power control mode)

NSERGCHPCMOD (non-serving E-RGCH power control mode)

SERGCHPCMOD (serving E-RGCH power control mode)

These parameters may have the value of FIXED, FOLLOW_TPC, RNC_BASED, CQI_BASED, or HSSCCH_BASED, aslisted in Table 6-1.

Table 6-1 Parameter values and corresponding power control methods

Parameter Value Power Control Method Channel

FIXED Based on fixed power E-RGCH, E-HICH, and E-AGCH

FOLLOW_TPC Based on downlink DPCH/F-DPCH TPC of the UE E-RGCH, E-HICH, and E-AGCH

RNC_BASED Based on DPCH/F-DPCH pilot of the UE E-RGCH, E-HICH, and E-AGCH

CQI_BASED Based on HSDPA CQI

The method is used when HSUPA and HSDPAare applied at the same time.

E-AGCH

HSSCCH_BASED Based on HSDPA HS-SCCH

The method is used when HSUPA and HSDPAare applied at the same time.

E-AGCH

6.4.2 Power Control Based on Fixed Power

If the power control based on the fixed power is used, the transmit power on the E-AGCH, E-RGCH, and E-HICH iscalculated with the following formula:

P = PP-CPICH + PO

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where:

P is the transmit power on these channels.

PP-CPICH is the transmit power on the P-CPICH.

PO is the power offset of the channel reference to the P-CPICH, used for setting the power on the E-AGCH, E-HICH, orE-RGCH in different situations.

The power offset is configured on the NodeB through the following parameters.

EAGCHPower (E-AGCH power)

SERGCHPower (Serving E-RGCH power)

NSERGCHPower (Non-serving E-RGCH power)

SingleRLEHICHPower (Single RL E-HICH power)

SEHICHPower (Serving E-HICH power)

NSEHICHPower (Non-serving E-HICH power)

6.4.3 Power Control Based on Downlink DPCH/F-DPCH

The demodulation conditions of HSUPA downlink control channels are quite similar to those of the TPC or pilot field of thedownlink DPCH/F-DPCH. Therefore, the power of HSUPA downlink control channels can be controlled based on the TPCor pilot field. The power based on TPC is similar to the power control based on pilot. Thus, only the power control basedon TPC is described in this section.

The HSUPA transmit power is calculated with the following formula:

P = PTPC + FUNC(PowOffset)

Where:

P is the transmit power on the E-AGCH, E-RGCH, or E-HICH.

PTPC is the transmit power in the TPC field on the DL DPCH or F-DPCH.

PowOffset is the power offset of the specific channel reference to the DPCCH TPC field.

− EAGCHPWROFFSET (E-AGCH)

− SERGCHPWROFFSET (E-RGCH of serving RLS

− NSERGCHPWROFFSET (E-RGCH of non-serving RLs)

− SRLEHICHPWROFFSET (E-RGCH of single RL)

− SEHICHPWROFFSET (E-RGCH of serving RLS)

− NSEHICHPWROFFSET (E-RGCH of non-serving RLS)

6.4.4 HSUPA E-AGCH Power Control (Based on CQI or HS-SCCH)

This section describes the feature WRFD-01061401 E-AGCH Power Control (Based on CQI or HS-SCCH).

The HSUPA E-AGCH power control is based on the serving cell. The serving HSUPA cell must be consistent with theserving HSDPA cell. Therefore, the HSDPA information can be used for HSUPA E-AGCH power control.

The available HSDPA information of CQI and HS-SCCH is discontinuous. Therefore, the HSUPA E-AGCH power control stilldepends on the power control based on the downlink DPCH/F-DPCH. When the HSDPA information of CQI or HS-SCCH isavailable, the information can be used to adjust the results of the power control. Otherwise, the power control based onthe DPCH/F-DPDCH is used directly on the E-AGCH.

The procedure of power control based on HSDPA is as follows:

1. The NodeB obtains the power offset of the E-AGCH calculated by the power control based on the downlink DPCH/F-DPCH.

2. If the HS-SCCH is transmitting data and using dynamic power control, the NodeB updates the E-AGCH power offsetbased on the HS-SCCH power.

3. If the HS-SCCH is not available and the NodeB receives CQIs from the UE, the CQIs are used to update the poweroffset of the E-AGCH.

4. The NodeB calculates the E-AGCH power based on the updated power offset. The E-AGCH power is limited by themaximum value of (P-CPICH power + MAXAGCHPOWER) and the minimum value of (P-CPICH power +MINAGCHPOWER).The MAXAGCHPOWER and MINAGCHPOWER parameters are set on the NodeB.

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7 Downlink Power Balance

This chapter describes the feature WRFD-020502 Downlink Power Balance.

Downlink power balance is used to reduce power drift between downlink radio links in macro diversity operation.

During soft handover, the uplink TPC command is demodulated in each radio link set (RLS). Because of demodulationerrors, the downlink transmit power of each branch drifts separately, which causes loss to the macro diversity gain.

During softer handover, the power among all branches may drift because of initial power difference.

The Downlink Power Balance (DPB) algorithm is introduced to reduce the power drift between links when the UE is in softor softer handover.

Figure 7-1 Downlink power balance

The implementation of the DPB algorithm is as follows:

1. Reporting the transmitted code power

According to measurement control from the RNC, the NodeB periodically reports the transmitted code power of eachradio link in soft or softer handover to the RNC.

2. Evaluating the power difference

For UEs in softer handover, the RNC evaluates the power difference of the radio links and decides whether to start orstop downlink power balance. For UEs in soft handover, downlink power balance is always active.

3. Calculating the UE downlink reference power (Pref)

The RNC calculates the downlink reference power Pref and transmits the Pref to the NodeB through the DOWNLINK

POWER CONTROL REQUEST message.

Pref = 0.5 x (Pmax - Pcpich, max) +0.5 x (Pmin - Pcpich, min)

Where:

Pref is the downlink reference power.

Pmax is the maximum downlink transmitted code power of all the UE radio links.

Pcpich, max is the P-CPICH power value of the cell that has the highest downlink transmitted code power among all the

UE radio links.

Pmin is the minimum downlink transmitted code power of all the UE radio links.

Pcpich, min is the P-CPICH power value of the cell that has the lowest downlink transmitted code power among all the UE

radio links.

4. The NodeB calculates and adjusts the transmitted code power of each radio link.

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In a DPB adjustment period of two frames, the total power correction is calculated with the following formula:

åPbal=( 1-r ) x ( Pref + PP-CPICH - Pinit)

Where:

åPbal is the total power correction.

r is fixed to 0.

Pref is the reference power that is calculated in the previous step.

PP-CPICH is the P-CPICH transmit power in a cell, which is defined by the PCPICHPower parameter.

Pinit is the transmit power of a radio link before adjustment.

åPbal determines the total power to be adjusted in a DPB adjustment cycle. In a 4-timeslot cycle, the total power to be

adjusted cannot exceed 1 dB, and the adjustment step of each timeslot is fixed to 0.25 dB.

The transmitted code power is calculated with the following formula:

P(i) = P(i-1) + PTPC(i) + Pbal(i)

Where:

P(i) is the transmitted code power of timeslot i.

P(i-1) is the transmitted code power of timeslot (i-1).

PTPC is the result of inner loop power control.

Pbal is a corrective term introduced by downlink power balance.

8 Parameters

Table 8-1 Parameter description

Parameter ID NE MML Command Meaning

AICHPowerOffset BSC6900ADD UCHPWROFFSET(Optional) Meaning: This parameter specifies the power offsetbetween the transmit power of an AICH and that ofP-CPICH. For details, refer to the 3GPP TS 25.433protocol.

GUI Value Range: -22~5Actual Value Range: -22~5Unit: dBDefault Value: -6

AICHTxTiming BSC6900ADD UAICH(Optional) Meaning: This parameter specifies the transmissiontiming information of an AICH relative to uplinkPRACH. "0" indicates that there are 7680 chips offsetbetween the access preamble of the PRACH andAICH. "1" indicates that there are 12800 chipsoffset between them. For detailed information ofthis parameter, refer to 3GPP TS 25.211.

GUI Value Range: 0~1Actual Value Range: 0~1Unit: NoneDefault Value: 1

BcchHspdschPower BSC6900ADD UCELLEFACH(Optional) Meaning: This parameter specifies the transmissionpower of the HS-PDSCH that sends the data carriedon the BCCH. When UE receive data from the HS-PDSCH in Enhanced CELL_FACH state, the dataon the BCCH is also sent on the HS-PDSCH.

GUI Value Range: -350~150Actual Value Range: -35~15, step:0.1

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Unit: dBDefault Value: 0

BcchHsscchPower BSC6900ADD UCELLEFACH(Optional) Meaning: This parameter specifies the power offsetbetween HS-SCCH and P-CPICH when BCCH ismapped onto the EFACH.When UE is in Enhanced CELL_FACH state, thedata on the BCCH is also sent on the HS-PDSCH.Meanwhile, the HS-SCCH shall send signalingrelated to HS-PDSCH. This parameter specifies thetransmission power of the HS-SCCH at the time.

GUI Value Range: -350~150Actual Value Range: -35~15, step:0.1Unit: dBDefault Value: -30

BCHPower BSC6900ADD UBCH(Optional) Meaning: Offset of the BCH transmit power from thePCPICH transmit power in a cell. For detailedinformation of this parameter, refer to 3GPP TS25.433 and TS 25.331.

GUI Value Range: -350~150Actual Value Range: -35~15, step: 0.1Unit: dBDefault Value: -20

BetaC BSC6900ADD UTYPRABBASIC(Mandatory) Meaning: Power occupancy of the control part ofreference TFC. For details, see 3GPP TS 25.214.

GUI Value Range: 1~15Actual Value Range: 1~15Unit: NoneDefault Value: None

BetaD BSC6900ADD UTYPRABBASIC(Mandatory) Meaning: Power occupancy of the data part ofreference TFC. For details, see 3GPP TS 25.214.


Constantvalue BSC6900ADD UPRACHBASIC(Optional) Meaning: This parameter specifies a constant usedat calculation of the initial transmit power of the firstpreamble, to be used in the random accessprocedure.The formula is as follows: Preamble_Initial_Power =Primary CPICH DL TX power-CPICH_RSCP + ULinterference + Constant Value. Where,Preamble_Initial_Power is the preamble initial TXpower, Primary CPICH DL TX power is the downlinktransmit (TX) power of PCPICH, CPICH_RSCP is thereceive signaling code power of the PCPICHmeasured by UEs, and UL interference is the uplinkinterference. For detailed information of thisparameter, refer to 3GPP TS 25.211.

GUI Value Range: -35~-10Actual Value Range: -35~-10Unit: dBDefault Value: -20

DefaultConstantValue BSC6900SET UFRC(Optional) Meaning: Constant that is used by the RNC tocalculate the DPCCH_Power_Offset which is furtherused by the UE to calculate the ULDPCCH_Initial_Power. The formulas are as follows:



DPCCH_Power_Offset = Primary CPICH DL TXpower + UL interference + Default Constant ValueHere, DPCCH_Power_Offset is the DPCCH initialtransmit (TX) power offset, Primary CPICH DL TXpower is the downlink TX power of the P-CPICH. DPCCH_Initial_Power = DPCCH_Power_offset -CPICH_RSCPHere, CPICH_RSCP is the received signal codepower of the P-CPICH measured by the UE. A small value of DPCCH_Power_Offset might leadto uplink synchronization failure at cell edges duringlink setup, thus affecting the uplink coverage. Alarge value of DPCCH_Power_Offset, however, hasinstantaneous interference on uplink reception,thus affecting the uplink reception performance.For details, see 3GPP TS 25.331.

GUI Value Range: -35~-10Actual Value Range: -35~-10Unit: dBDefault Value: -22

FddTpcDlStepSize BSC6900SET UFRC(Optional) Meaning: Step of the closed-loop power controlperformed on DL DPCH in Frequency DivisionDuplex (FDD) mode. For details, see 3GPP TS25.214.

GUI Value Range: STEPSIZE_0.5DB,STEPSIZE_1DB, STEPSIZE_1.5DB,STEPSIZE_2DBActual Value Range: 0.5, 1, 1.5, 2Unit: dBDefault Value: STEPSIZE_1DB

FdpchMaxRefPwr BSC6900SET UFDPCHRLPWR(Optional) Meaning: This parameter specifies the maximumreference power for the F-DPCH, relative to theassigned P-CPICH power. For details of thisparameter, refer to the 3GPP TS 25.433.


FdpchMinRefPwr BSC6900SET UFDPCHRLPWR(Optional) Meaning: This parameter specifies the minimumreference power for the F-DPCH. This parameterindicates the minimum value of reference F-DPCHTX power, that is, the value of the Minimum DLPower IE. For details of this parameter, refer to the3GPP TS 25.433.


FdpchPO2 BSC6900SET UFDPCHPARA(Optional) Meaning: Offset between TPC command power inF-DPCH channel and reference F-DPCH TX power(represented by the Initial DL Transmission PowerIE).

GUI Value Range: 0~24Actual Value Range: 0~6, step: 0.25Unit: dBDefault Value: 12

GainFactorBetaC BSC6900ADD UPRACHTFC(Mandatory) Meaning: This parameter specifies the powerassignment factor of the control part. For detailed



information of this parameter, refer to 3GPP TS25.214.


GainFactorBetaD BSC6900ADD UPRACHTFC(Optional) Meaning: The power occupancy factor of the datapart. For detailed information of this parameter,refer to 3GPP TS 25.214.


MaxAllowedUlTxPower BSC6900ADD UCELLSELRESEL(Optional) Meaning: The maximum allowed uplink transmitpower of a UE in the cell, which is related to thenetwork planning. For detailed information, refer to3GPP TS 25.304.

GUI Value Range: -50~33Actual Value Range: -50~33Unit: dBmDefault Value: 24

MaxAllowedUlTxPower BSC6900ADD UEXT3GCELL(Mandatory) Meaning: This parameter specifies the maximumallowed uplink TX power of a UE in the cell. Whenthis parameter is not set to any value, the UEadopts the corresponding value of the currentserving cell, added through the ADDUCELLSELRESEL command. Generally, thisparameter is not set to any value.

GUI Value Range: -50~33Actual Value Range: -50~33Unit: dBmDefault Value: None

MaxFachPower BSC6900ADD UFACH(Optional) Meaning: The offset between the FACH transmitpower and P-CPICH transmit power in a cell.

GUI Value Range: -350~150Actual Value Range: -35~15, step: 0.1Unit: dBDefault Value: 10

MAXAGCHPOWER NodeB SET MACEPARA(Optional) Meaning: E-AGCH max power

GUI Value Range: -350~150

Actual Value Range: -35~15, step: 0.1

Unit: dB

Default Value: -

MINAGCHPOWER NodeB SET MACEPARA(Optional) Meaning: E-AGCH min power

GUI Value Range: -350~150

Actual Value Range: -35~15, step: 0.1

Unit: dB

Default Value: -

MaxUlTxPowerforBac BSC6900ADD UCELLCAC(Optional) Meaning: The maximum UL transmit power forbackground service in a specific cell. It is based onthe UL coverage requirement of the backgroundservice designed by the network planning.Fordetailed information of the related IE "Maximum



allowed UL TX power", refer to the 3GPP TS25.331.


MaxUlTxPowerforConv BSC6900ADD UCELLCAC(Optional) Meaning: Maximum UL transmit power forconversational service in a specific cell. It is basedon the UL coverage requirement of theconversational service designed by the networkplanning.For detailed information of the related IE"Maximum allowed UL TX power", refer to the 3GPPTS 25.331.


MaxUlTxPowerforInt BSC6900ADD UCELLCAC(Optional) Meaning: The maximum UL transmit power for theinteractive service in a specific cell. It is based onthe UL coverage requirement of the interactiveservice designed by the network planning.Fordetailed information of the related IE "Maximumallowed UL TX power", refer to the 3GPP TS25.331.


MaxUlTxPowerforStr BSC6900ADD UCELLCAC(Optional) Meaning: Maximum UL transmit power for thestreaming service in a specific cell. It is based onthe UL coverage requirement of the streamingservice designed by the network planning.Fordetailed information of the related IE "Maximumallowed UL TX power", refer to the 3GPP TS25.331.


Mmax BSC6900ADD URACH(Optional) Meaning: The parameter specifies the maximumnumber of preambles to be used in one preambleramping cycle. For detailed information of thisparameter, refer to 3GPP TS 25.331


NB01max BSC6900ADD URACH(Optional) Meaning: Upper limit of random access back-offdelay. For details, refer to the 3GPP TS 25.331 and3GPP TS 25.214 protocols.

GUI Value Range: 0~50Actual Value Range: 0~50Unit: frameDefault Value: 0

NB01min BSC6900ADD URACH(Optional) Meaning: Lower limit of random access back-offdelay. For details, refer to the 3GPP TS 25.331 and3GPP TS 25.214 protocols.



GUI Value Range: 0~50Actual Value Range: 0~50Unit: frameDefault Value: 0

PCHPower BSC6900ADD UPCH(Optional) Meaning: Offset of the PCH transmit power from thePCPICH transmit power in a cell. For detailedinformation of this parameter, refer to 3GPP TS25.433.


PCPICHPower BSC6900ADDUCELLQUICKSETUP(Optional)ADD UPCPICH(Optional)

Meaning: TX power of the PCPICH in a cell. Thisparameter should be set based on the actualsystem environment such as cell coverage (radius)and geographical environment. For the cells to becovered, the downlink coverage should beguaranteed as a premise. For the cells requiringsoft handover area, this parameter should satisfythe proportion of soft handover areas stipulated inthe network planning. For detailed information ofthis parameter, refer to 3GPP TS 25.433.

GUI Value Range: -100~500Actual Value Range: -10~50, step: 0.1Unit: dBmDefault Value: 330

PcSwitch BSC6900SETUCORRMALGOSWITCH(Optional)

Meaning: Power control switch group.1)PC_CFG_ED_POWER_INTERPOLATION_SWITCH:When the switch is on, E-DPDCH powerinterpolation formula is allowed. Otherwise,interpolation formula is not allowed. When theinterpolation formula is used, E-TFCI and PO isinvolved in the calculation of transmit power forblock transmission on the E-DPDCH. In addition,the extrapolation formula is also used. theinterpolation formular is used for high-speedservices, whereas the extrapolation formula is usedfor low-speed services. For details, see the 3GPPTS 25.214.2) PC_DL_INNER_LOOP_PC_ACTIVE_SWITCH:When the switch is on, the status of inner loop DLpower control is set to "Active." When the switch isnot on, the status is set to "Inactive." 3) PC_DOWNLINK_POWER_BALANCE_SWITCH:When the switch is on, the RNC supports DL powerbalancing. During soft handover, TPC bit errorsmay cause DL power drift. DL power balancing isenabled to balance the DL power between links,thus achieving the optimal gain of soft handover. 4) PC_EFACH_ECN0_DYN_ADJ_SWITCH: Whenthe switch is on, the target value of Ec/N0 can bedynamically reconfigured on the E-FACH. When theswitch is disabled, the minimum value of Ec/N0 isdirectly configured for the NodeB.5) PC_FP_MULTI_RLS_IND_SWITCH: When theswitch is on, the RNC informs the NodeB of thecurrent RLS number through the FP inbandsignaling. 6)PC_HSUPA_HARQNUM_AUTO_ADJUST_SWITCH:When the switch is on, the HSUPA service can use



the smaller target number of retransmissions whenthe uplink is not congested. If the uplink iscongested, the HSUPA service can use the typicaltarget number of retransmissions.7) PC_INNER_LOOP_LMTED_PWR_INC_SWITCH:When the switch is on, the limited power increasefunction is used for DL inner loop power control. 8) PC_OLPC_SWITCH: When the switch is on, theRNC updates the UL SIR TARGET of radio links onthe NodeB side through IUB DCH FP inbandsignaling. 9)PC_RL_RECFG_SIR_TARGET_CARRY_SWITCH:When the switch is not on, a new initial SIRTargetvalue, during radio link reconfiguration, is based onthe converged SIRTarget value of current outerloop power control. In addition, the UL SIRTargetvalue is not included in the radio linkreconfiguration messages to the NodeB. This switchis only valid when the OLPC switch is ON. 10) PC_SIG_DCH_OLPC_SWITCH: When theswitch is on, SIG DCH is involved in UL OLPC asservice DCH is. If the current link has only SIG DCH,SIG DCH is always involved in UL OLPC. 11) PC_UL_SIRERR_HIGH_REL_UE_SWITCH:When the switch is on, the UE is unconditionallyreleased if the SIR error is high and the cell isoverloaded. Otherwise, the UE is not released.

GUI Value Range:PC_CFG_ED_POWER_INTERPOLATION_SWITCH,PC_DL_INNER_LOOP_PC_ACTIVE_SWITCH,PC_DOWNLINK_POWER_BALANCE_SWITCH,PC_EFACH_ECN0_DYN_ADJ_SWITCH,PC_FP_MULTI_RLS_IND_SWITCH,PC_HSUPA_HARQNUM_AUTO_ADJUST_SWITCH,PC_INNER_LOOP_LMTED_PWR_INC_SWITCH,PC_OLPC_SWITCH,PC_RL_RECFG_SIR_TARGET_CARRY_SWITCH,PC_SIG_DCH_OLPC_SWITCH,PC_UL_SIRERR_HIGH_REL_UE_SWITCHActual Value Range:PC_CFG_ED_POWER_INTERPOLATION_SWITCH,PC_DL_INNER_LOOP_PC_ACTIVE_SWITCH,PC_DOWNLINK_POWER_BALANCE_SWITCH,PC_EFACH_ECN0_DYN_ADJ_SWITCH,PC_FP_MULTI_RLS_IND_SWITCH,PC_HSUPA_HARQNUM_AUTO_ADJUST_SWITCH,PC_INNER_LOOP_LMTED_PWR_INC_SWITCH,PC_OLPC_SWITCH,PC_RL_RECFG_SIR_TARGET_CARRY_SWITCH,PC_SIG_DCH_OLPC_SWITCH,PC_UL_SIRERR_HIGH_REL_UE_SWITCHUnit: NoneDefault Value: None

PICHPowerOffset BSC6900ADD UCHPWROFFSET(Optional) Meaning: Difference between the transmit power ofPICH and that of PCPICH. For details, refer to the3GPP TS 25.433 protocol.

GUI Value Range: -10~5Actual Value Range: -10~5Unit: dBDefault Value: -7

PowerOffsetPpm BSC6900ADD UPRACHTFC(Mandatory) Meaning: The power offset between the last accesspreamble and the message control part. The powerof the message control part can be obtained by

adding the offset to the access preamble power.For detailed information of this parameter, refer to3GPP TS 25.213.

GUI Value Range: -5~10Actual Value Range: -5~10Unit: dBDefault Value: None

PowerRampStep BSC6900ADD UPRACHBASIC(Optional) Meaning: The power ramp step of the randomaccess preambles transmitted before the UEreceives the acquisition indicator in the randomaccess process. For detailed information of thisparameter, refer to 3GPP TS 25.211.

GUI Value Range: 1~8Actual Value Range: 1~8Unit: dBDefault Value: 2

PreambleRetransMax BSC6900ADD UPRACHBASIC(Optional) Meaning: The maximum number of preamblestransmitted in a preamble ramping cycle. Fordetailed information of this parameter, refer to3GPP TS 25.211.


PSCHPower BSC6900ADD UPSCH(Optional) Meaning: Offset of the PSCH transmit power fromthe PCPICH transmit power in a cell.


PwrCtrlAlg BSC6900SET UFRC(Optional) Meaning: This parameter specifies how the UEinterprets the received Transmit Power Control(TPC) commands, that is, selecting a UL inner-looppower control algorithm. Two different algorithms(denoted ALGORITHM1 and ALGORITHM2) areavailable, related to this parameter. When theparameter is set to ALGORITHM1, the UE adjuststhe uplink transmit power once every timeslot.When the parameter is set to ALGORITHM2, the UEadjusts the uplink transmit power once every fivetimeslots. For details, see 3GPP TS 25.214.

GUI Value Range: ALGORITHM1, ALGORITHM2Actual Value Range: ALGORITHM1, ALGORITHM2Unit: NoneDefault Value: ALGORITHM1

RlMaxDlPwr BSC6900ADD UCELLRLPWR(Mandatory) Meaning: This parameter specifies the maximum DLRL power to be assigned.This parameter should fulfill the coveragerequirement of the network planning, and the valueis relative to [PCPICH transmit power]. For detailedinformation of this parameter, refer to 3GPP TS25.433.

GUI Value Range: -350~150Actual Value Range: -35~15, step:0.1Unit: dBDefault Value: None



RlMinDlPwr BSC6900ADD UCELLRLPWR(Mandatory) Meaning: This parameter specifies the minimum DLRL power to be assigned.This parameter should consider the maximumdownlink transmit power and the dynamic range ofpower control, and the value is relative to [PCPICHtransmit power]. Since the dynamic range of powercontrol is set to 15 dB, this parameter isrecommended as [RL Max DL TX power] - 15 dB. For detailed information of this parameter, refer to3GPP TS 25.433.

GUI Value Range: -350~150Actual Value Range: -35~15, step:0.1Unit: dBDefault Value: None

SSCHPower BSC6900ADD USSCH(Optional) Meaning: Offset of the SSCH transmit power fromthe PCPICH transmit power in a cell.


EAGCHPCMOD NodeB SET MACEPARA(Optional) Meaning: E-AGCH power control policy

GUI Value Range: FIXED(Fixed Transmit Power),RNC_BASED(Dynamic Transmit Power ControlBased on the Pilot of DPCH or F-DPCH),FOLLOW_TPC(Dynamic Transmit Power ControlBased on the TPC of DPCH or F-DPCH),CQI_BASED(Dynamic Transmit Power ControlBased on CQI), HSSCCH_BASED(DynamicTransmit Power Control Based on HS-SCCH)Actual Value Range: FIXED, RNC_BASED,FOLLOW_TPC, CQI_BASED, HSSCCH_BASEDUnit: NoneDefault Value: -

EAGCHPOWER NodeB SET MACEPARA(Optional) Meaning: This parameter specifies the power offsetof the E-AGCH from the power of the common pilotchannel.

GUI Value Range: -350~150Actual Value Range: -35~15, step: 0.1Unit: dBDefault Value: -

EAGCHPWROFFSET NodeB SET MACEPARA(Optional) Meaning: The power offset between the E-AGCHand the TPC. To obtain the power of the current 2ms sub-frame, an offset is added to the power ofthe TPC field power of the corresponding DPCCH.This offset is related to the signal-to-noise ratiodifference.

GUI Value Range: 0~255Actual Value Range: -32~31.75, step: 0.25Unit: dBDefault Value: -

SRLEHICHPWROFFSET NodeB SET MACEPARA(Optional) Meaning: E-HICH power offset for dingle radio linkset




HSSCCHFERTRGTINDCH NodeB SET MACHSPARA(Optional) Meaning: HS-SCCH FER target in CELL DCH state

GUI Value Range: 1~999Actual Value Range: 1~999Unit: per millDefault Value: -

HSSCCHPWRCMINDCH NodeB SET MACHSPARA(Optional) Meaning: HS-SCCH power control method in CELLDCH state

GUI Value Range: CQI(Adaptive Power ContrlBased on CQI), FIXED(Fixed Power)Actual Value Range: CQI, FIXEDUnit: NoneDefault Value: -

HSSCCHPWRCMINEFACHNodeB SET MACHSPARA(Optional) Meaning: CELL FACH HS-SCCH power controlmethod

GUI Value Range: CQI(Adaptive Power ContrlBased on CQI), FIXED(Fixed Power)Actual Value Range: CQI, FIXEDUnit: NoneDefault Value: -

NSEHICHPCMOD NodeB SET MACEPARA(Optional) Meaning: E-HICH power control policy for non-service radio link set

GUI Value Range: FIXED(Fixed Transmit Power),RNC_BASED(Dynamic Transmit Power ControlBased on the Pilot of DPCH or F-DPCH),FOLLOW_TPC(Dynamic Transmit Power ControlBased on the TPC of DPCH or F-DPCH)Actual Value Range: FIXED, RNC_BASED,FOLLOW_TPCUnit: NoneDefault Value: -

NSEHICHPOWER NodeB SET MACEPARA(Optional) Meaning: This parameter specifies the power offsetof the E-HICH non-serving RLS from the power ofthe common pilot channel.


NSEHICHPWROFFSET NodeB SET MACEPARA(Optional) Meaning: E-HICH power offset for non-service radiolink set from associated DPCH_TPC field. To obtainthe power of the current 2 ms sub-frame, an offsetis added to the power of the TPC field power of thecorresponding DPCCH. This offset is related to thesignal-to-noise ratio difference.


NSERGCHPCMOD NodeB SET MACEPARA(Optional) Meaning: E-RGCH power control policy for non-service radio links

GUI Value Range: FIXED(Fixed Transmit Power),RNC_BASED(Dynamic Transmit Power ControlBased on the Pilot of DPCH or F-DPCH),FOLLOW_TPC(Dynamic Transmit Power ControlBased on the TPC of DPCH or F-DPCH)Actual Value Range: FIXED, RNC_BASED,


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FOLLOW_TPCUnit: NoneDefault Value: -

NSERGCHPOWER NodeB SET MACEPARA(Optional) Meaning: This parameter specifies the power offsetof the E-RGCH non-serving RL from the power ofthe common pilot channel.


NSERGCHPWROFFSET NodeB SET MACEPARA(Optional) Meaning: E-RGCH power offset from associatedDPCH_TPC field for non-service radio links. Toobtain the power of the current 2 ms sub-frame, anoffset is added to the power of the TPC field powerof the corresponding DPCCH. This offset is relatedto the signal-to-noise ratio difference.


SCCHPWR NodeB SET MACHSPARA(Optional) Meaning: The power of the HS-SCCH is an offset indB to the transmit power of the PCPICH.

GUI Value Range: 0~80Actual Value Range: -10~10, step: 0.25Unit: dBDefault Value: -

SEHICHPCMOD NodeB SET MACEPARA(Optional) Meaning: E-HICH power control policy for serviceradio link set


SEHICHPOWER NodeB SET MACEPARA(Optional) Meaning: This parameter specifies the power offsetof the E-HICH serving RLS from the power of thecommon pilot channel.


SEHICHPWROFFSET NodeB SET MACEPARA(Optional) Meaning: E-HICH power offset for service radio linkset from associated DPCH_TPC field. To obtain thepower of the current 2 ms sub-frame, an offset isadded to the power of the TPC field power of thecorresponding DPCCH. This offset is related to thesignal-to-noise eatio difference.


SERGCHPCMOD NodeB SET MACEPARA(Optional) Meaning: E-RGCH power control policy for service



radio link set


SERGCHPOWER NodeB SET MACEPARA(Optional) Meaning: This parameter specifies the power offsetof the E-RGCH serving RLS from the power of thecommon pilot channel.


SERGCHPWROFFSET NodeB SET MACEPARA(Optional) Meaning: E-RGCH power offset for service radiolink set from the associated DPCH_TPC field. Toobtain the power of the current 2 ms sub-frame, anoffset is added to the power of the TPC field powerof the corresponding DPCCH. This offset is relatedto the signal-to-noise ratio difference.


SINGLERLEHICHPOWER NodeB SET MACEPARA(Optional) Meaning: E-HICH power for single radio Link set


9 Counters

For details, see the BSC6900 UMTS Performance Counter Reference and NodeB Performance Counter Reference.

10 Glossary

For the acronyms, abbreviations, terms, and definitions, see the Glossary.

11 Reference Documents[1] 3GPP TS 25.211: Physical channels and mapping of transport channels onto physical channels (FDD)

[2] 3GPP TS 25.214: Physical layer procedures (FDD)

[3] 3GPP TS 25.331: RRC Protocol Specification

[4] 3GPP TS 25.433: UTRAN Iub interface NodeB Application Part (NBAP) signaling

[5] HSDPA Feature Parameter Description

power control

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