Huawei Technologies Co., Ltd.

Documentation Center of Radio Network System Dept. Product Version Confidentiality Level

R01For internal use only

Product name: CDMA1X43 Pages in Total

Guide to CDMA1X Power Control Planning (V1.0)

(For internal use only)

Drafted by: Chen ZhimingDate: 2002-08-30

Reviewed by: Technical support teamDate:2002-07-30

Reviewed by:Date:yyyy-mm-dd

Approved by: Date:2002-07-30

Huawei Technologies Co., Ltd

All rights reservedRevision Record

DateRevised EditionDescription Author

2002-07-301.00The first transmittalChen Zhiming

Table of Contents

71 About This Document

72 General Description of Power Control Algorithm

82.1 Reverse Power Control Principle

92.1.1 Reverse Open Loop Power Control

122.1.2 Closed Loop Power Control

132.2 Forward Power Control Principle

132.2.1 Measurement Report Power Control

142.2.2 EIB Power Control

152.2.3 Forward Fast Power Control

162.3 Comparison of Power Control Speeds

172.4 Relation between Power Control and Network Performance

172.4.1 Forward Power Allocation

172.4.2 Relations between Power Control and System Capacity and Quality

182.4.3 Conclusion of Criterion for Good Performance of Reverse Power Control

203 Recommendation on Forward Power Allocation Parameters

203.1 Sector Carrier Frequency Gain

203.1.1 PILOT

203.2 Pilot Channel Gain

203.2.1 PILOT_CH

203.3 Synchronous Channel Gain

203.3.1 SYNC_CH

213.4 Paging Channel Gain

213.4.1 P_CH

213.5 Fast Paging Channel Gain

213.5.1 QP_CH

234 Recommendations for Power Control Power Configuration

234.1 About Special Representation Methods

234.1.1 Negative Numbers

234.1.2 Set Value of Reverse Outloop

234.1.3 Transmit Powers of Forward Channels

234.1.4 Set Values of Forward Fast Power Control Eb/Nt

244.1.5 Representation of FER

244.2 Table of Reverse Power Control Parameters (REVPARA)

304.3 Power Control Parameter Configuration Table (PCPARA)

344.4 FMR Power Control Algorithm Configuration Table (PCALG)

354.5 Forward Power Control Configuration Table (FPCPARA)

404.6 EIB Power Control Parameter Table (EIBPCPARA)

414.7 Outloop Algorithm Parameter Table (OLPCALG)

424.8 Target FER Configuration Table

List of Tables

7Table 1 List of mobile phone protocol version:

8Table 2 Relations between forward RCs and rate set

8Table 3 Relations between reverse RCs and rate sets

9Table 4 Open loop power offset

14Table 5 Adjustment method of EIB power control

16Table 6 Reverse power control subchannel configuration table

17Table 7 Comparison of various power control speeds

21Table 5 Fast paging channel power offset

24Table 9 Objective frame error rate

25Table 10 Relation between sector gains and NOM_PWRs

List of Figures

8Figure 1 Start points when reverse open loop and closed loop work

12Figure 2 Schematic diagram of closed loop power control

14Figure 3 Measurement report power control

15Figure 4 Schematic diagram of forward closed loop power control

Recommendation on the Parameter Configuration of CDMA1X Power Control

Key words: CDMA1X, power control, parameter configuration

Abstract: This article gives an introduction of CDMA1X power control process and algorithm and describes in detail the implications of the parameters related with power control and recommendations for their configuration.

List of abbreviations:

CDMA

Code Division Muti Access

BTS

Base Transceiver System

BSC

BTS Controller

MS

MS

FER

Frame Error Ratio

SDU

Selection/Distribution Unit

EIB

Erase Indication Bit

PMRM

Power Measurement Report Message

RV TFC

Reverse Traffic Channel

FW TFC

Forward Traffic Channel

RC

Radio configuration

Ec/Io

Pilot energy accumulated over one PN chip period (Ec) to the total

power spectral density (Io) in the received bandwidth

ECAM

Extended Channel Assignment message

SPU

Signal Processing Unit

FCH

Fundamental Channel

SCH

Supplemental Channel

SCCH

Supplemental Code Channel

NUM_RSCCHNumber of Reverse Supplemental Code channel

FMR

Frame Processing Board

Rx

Received Power

Tx

Transmit Power

List of reference materials:

List of reference materials

NameAuthorNumber

Release dateWhere to get it

Publishing unit

017p1 Physical layer (Part 1) reference standard3GPP2

IS200053GPP2

CDMA1XBSC RRMDB Data Configuration020123RRM algorithm

CDMA Mobile Communication TechnologySun Lixin

A Study Report on Power Control Algorithm Ji Jiagang

CDMA1X TechnologyYang Dacheng

80-V1282-1_X5_param_set.pdfQualcomm document

1 About This Document

BSC version that this article corresponds to: BSC6600V100R001B02D004

There are conversion relationships between several classes of parameters, parameter configuration values and their actual meanings, which are all described in 4.1.

This article is only provided to Huaweis engineers for use.

The parameter configurations are recommended, based on the values currently understood. After more application, tests and verification, modifications will be made in the later versions.

2 General Description of Power Control Algorithm

CDMA1X is interference-restricted system. Interference directly affects the network capacity, coverage and system quality. And in a CDMA network, the interference mainly comes from other users in the system or the transmit power of base transceiver stations (BTSs). So, as long as the transmit power of mobile phones and BTSs in the network is controlled, interference can be controlled. As a result, the network capacity, coverage and quality can reach expected results and network performance can be optimized.

In CDMA1X, power control includes forward power control and reverse power control. Forward power control includes measurement report, EIB and fast power control; Reverse power control consists of open loop power control and closed loop power control. Open loop power control and closed loop power control work at the same time in reverse control of each call. Forward power control adopts one of the above three methods. For a single call, it is not allowed to adopt several forward power control methods at the same time.

For reverse power control algorithm, 95 mobile phones and 2000 mobile phones adopt the same algorithm.

For forward power control algorithm, an algorithm should be chosen according to the mobile phone protocol version and channel RC. For CDMA1X mobile phones (that is, the mobile phone protocol version is higher than or equal to 6), fast power control is adopted as the preference and measurement reporting or EIB power control can also be adopted. If the mobile phone version is 2 to 5, and if RC1 channel is allocated, measurement report power control is adopted for forward power control. If the mobile phone version is 3 to 5 and RC2 channel is allocated, EIB power control is adopted for forward power control and measurement report power control can also be adopted.

Attachment 1: List of mobile phone protocol version:

Table 1 List of mobile phone protocol version:

Version

1IS95

2IS95

3IS95A

4IS95B

5IS95B

620001x

Attachment 2: Relations between RCs and rate sets

Table 2 Relations between forward RCs and rate setForward RCRate set

RC1RATESET1

RC2RATESET2

RC3RATESET1

RC4RATESET1

RC5RATESET2

Table 3 Relations between reverse RCs and rate sets

Reverse RC Rate set

RC1RATESET1

RC2RATESET2

RC3RATESET1

RC4RATESET2

RATESET1 is of 9.6k series and RATESET2 is of 14.4k series. For 95 mobile phones, only RATESET2 has EIB bits, and this is the prerequisite for the adoption of forward EIB.

A detailed parameter description is given below, with respect to different power control modes.

2.2 Reverse Power Control Principle

The object of reverse power control is the transmit power of mobile stations (MSs).

The time points for reverse open loop and closed loop to work are respectively as shown in the figure below:

Figure 2 Start points when reverse open loop and closed loop work

2.2.2 Reverse Open Loop Power Control

Open loop power control means that MSs determine how big the transmit power should be according to received signals. It estimates the reverse transmit power according to the forward receiving power, but radio transmission environments for forward and reverse links are completely different from each other. So, this estimation is not accurate. When an MS has just gained access to the network, only open loop power control works. After a channel is assigned to it, closed loop power control begins to work. On the base of open loop estimation, closed loop power control makes a quick adjustment of the transmit power of the MS, which enables the MS to transmit signals with the minimum power in the condition that FER requirements are met in the whole process of the call session. Thus, the interference to other users is minimized.

As for open loop power control, the calculation methods of open loop power controls of different channels are different. Now, we will describe the calculation methods of open loop power controls in different conditions.

I. The transmit power of each access probing when transmitting signals on access channels

Average output power (dBm) = -average input power (dBm) + offset power + interference correction factor +

NOM_PWRs - 16NOM_PWR_EXTs +

INIT_PWRs+PWR_LVLPWR_STEPs

In the above formula, average input power is the total power of an MS in the working frequency band; offset power is related with spread spectrum rate (SR), frequency band, channel type, etc., see Table 4; interference correction factors differ with channels. The specific descriptions will be given in the following detailed description of the open loop power of each channel; NOM_PWRs are used to compensate the offset of the transmit power of a BTS to the nominal power (See the section of parameter description); NOM_PWR_EXTs are used to correct the offset of the transmit power of a BTS to the nominal power. But when the frequency band type is 0, 2, 3 and 5, this item is 0, and when the frequency band type is 1, 4 and 6, this item is not 0. It is transmitted to MSs through an access parameter message via BSC. INIT_PWRs are used to compensate the differences of the transmit powers of MSs caused by different loads. Its role is to enable the transmit power of an MS to be received by BTSs with the power slightly lower than required power at the first access probing. Thus, after several probing accesses, the signals of the MS can be received by BTSs with the exact power required, enabling the power of the MS to be kept at the maximum level at the time of access and that the interference to other MSs can be minimized; PWR_LVLPWR_STEP is the power to be increased after PWR_STEP+1 times of probing, in which PWR_LVL is the power to be increased between two probing attempts.

Table 4 Open loop power offset

Frequency band typeForward extended rateReverse extended rateReverse channelOffset power

0, 2, 3, 511Access channel

Reverse traffic channel (RC1, RC2)-73

Enhanced access channel

Reverse public control channel

Reverse traffic channel (RC3, RC4)-81.5

31Reverse traffic channel (RC3, RC4)-76.5

3Enhanced access channel

Reverse public control channel

Reverse traffic channel (RC5, RC6)-76.5

1,4,611Access channel

Reverse traffic channel (RC1, RC2)-76

Enhanced access channel

Reverse public control channel

Reverse traffic channel (RC = 3 or 4)-84.5

31Reverse traffic channel (RC = 3 or 4)-79.5

3Enhanced access channel

Reverse public control channel

Reverse traffic channel (RC = 5 or 6)-79.5

The current 800M CDMA1X uses frequency band 0 and the forward and reverse extended rate is SR1. So, the offset power of the access channel is -73 (This is a constant, without unit).

Average input power is the total power received in the working frequency band. The power includes the power sent by the local BTS and the signals sent from other BTS, and it stands at 1.23M frequency band of the local BTS.

The interference correction factor of an access channel is min (max (-7-ECIO,0),7). This is, when Ec/Io SCH forward outloop set difference threshold (FOR_FPC_SET_PT_THRESHOLD), the mobile station will report OLPM, and at the same time update FPC_DELTA_SETPTs to result of FCH set value - SCCH set value of this moment.

If the forward channel contains DCCH and SCH, but no FCH, then FPC_DELTA_SETPTs = DCCH set value SCH set value. For every frames received, if DCCH set value SCH set value - FPC_DELTA_SETPTs > SCH forward outloop set difference threshold (FOR_FPC_SET_PT_THRESHOLD), the mobile station will report OLPM, and at the same time update FPC_DELTA_SETPTs to result of FCH set value - SCCH set value of this moment.

Parameter name: Forward power control sub-channel gain 1 (FOR_FPC_SUB_CHAN_GAIN1)

Definition: Indicating the size of the power of forward power control sub-channel for the forward traffic channel when there is no soft handover branch.

Value range: (0 to 255)

Unit: 0.25dB

Reliable system value range: (0 to 255) Recommended value: 0, i.e. 0dB.

Balance setting: When there is no soft handover branch, just set the forward power control sub-channel to be consistent with the traffic channel.

Remarks: The forward power control sub-channel is composed of the part of bits extracted from forward FCH or DCCH channel, which belongs to part of the forward traffic channel. Where there is no soft handover branch, their power requirement is the same. But in the soft handover state, the service frames is the maximum ratio combination of multi-path energy in MS. But the power control sub-channel gain is to be demodulated separately on every branch (when one branch increases, the MS will increases the power; the MS decreases the power only when all branches require to decrease the power). At this time, it is required that the power control sub-channel energy is higher than the traffic channel transmit power. For the two branches of softer handover, the power control bit is also the maximum ratio combination of multi-path energy, and the processing of power control bit is consistent with that of traffic channel, i.e. combining the energy of two branches, as the power control bits come from the same BTS at this time are the same.

The identification between soft handover and softer handover is implemented by means of the PWR_COMB_IND field of the enhanced handover indication message (EHDM). The function of this field is to identify whether the power control bit of the soft handover branch is consistent with that of the previous branch in the message. If so, it indicates that this branch and the previous branch belong to the same station. The relation between these two branches belong to softer handover, thus this field is set to 1. Otherwise, it indicates that these two branches belong to different BTSs. The relation between them is soft handover, and this field is 0.

Parameter name: Forward power control sub-channel gain 2 (FOR_FPC_SUB_CHAN_GAIN2)

Recommended value: 12, i.e. 3dB

Remarks: The relation between the transmit power of forward power control sub-channel and that of traffic channel in case of soft handover of two branches. For other description, see in the parameter of forward power control sub-channel gain 1.

Parameter name: Forward power control sub-channel gain 3 (FOR_FPC_SUB_CHAN_GAIN3)

Recommended value: 19, i.e. 4.75dB

Remarks: This parameter refers to the relation between transmit power of forward power control sub-channel and that of the traffic channel in case of soft handover of three branches or above. For other description, see in the parameter of forward power control sub-channel gain 1.

Parameter name: Forward transmission initial set value (FOR_INITIAL_GAIN_RATIO)

Definition: The initial transmit power of forward fast power control

Value range: (0 to 255)

Unit: 0.25dB

Recommended value: 193, i.e. 15.5dB, and 2.8% of the sector power.

Balance setting: The adequacy of the setting mainly affects the speed of the power adjustment process. If it is set properly, the system can adjust the required power quickly; if it is set too high, at the beginning, the transmit power of the BTS will be too high, which results in power waste; if it is too low, at the beginning, the network performance cannot reach the designated requirement (e.g. FER