ps power control

Huawei Proprietary and Confidential

Copyright © Huawei Technologies Co., Ltd.

GSM BSS

PS Power Control Feature Parameter Description

Copyright © Huawei Technologies Co., Ltd. 2011. 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 Huawei Technologies Co., Ltd.

Trademarks and Permissions

and other Huawei trademarks are trademarks of Huawei Technologies Co., Ltd.

All other trademarks and trade names mentioned in this document are the property of their respective holders.

Notice

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 document to ensure accuracy of the contents, but all statements, information, and recommendations in this document do not constitute a warranty of any kind, express or implied.

GSM BSS

PS Power Control Contents

Issue 01 (2011-03-31) Huawei Proprietary and Confidential


i

Contents

1 Introduction ................................................................................................................................ 1-1

1.1 Scope ............................................................................................................................................ 1-1

1.2 Intended Audience......................................................................................................................... 1-1

1.3 Change History .............................................................................................................................. 1-1

2 Overview...................................................................................................................................... 2-1

3 Uplink PS Power Control ........................................................................................................ 3-1

4 Downlink PS Power Control ................................................................................................... 4-1

4.1 Principles ....................................................................................................................................... 4-1

4.2 MR Processing .............................................................................................................................. 4-1

4.3 Decision Algorithms ....................................................................................................................... 4-1

4.4 Coding Scheme Stability Check .................................................................................................... 4-2

4.5 Calculation of the Dynamic Power Attenuation Value ................................................................... 4-3

4.6 Dynamic Power Control ................................................................................................................ 4-3

5 Engineering Guidelines ........................................................................................................... 5-1

6 Parameters.................................................................................................................................. 6-1

7 Counters ...................................................................................................................................... 7-1

8 Glossary ...................................................................................................................................... 8-1

9 Reference Documents ............................................................................................................. 9-1

GSM BSS

PS Power Control 1 Introduction



1-1

1 Introduction

1.1 Scope

This document describes the PS power control feature of Huawei GBSS by providing mainly the functions and technical principles of the PS uplink power control and the PS downlink power control.

The feature involved is GBFD-119504 PS Power Control.

1.2 Intended Audience

It is assumed that users of this document are familiar with GSM basics and have a working knowledge of GSM telecommunication.

This document is intended for:

Personnel working on Huawei GSM products or systems

System operators who need a general understanding of this feature

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 PS power control feature of a specific product version.

Editorial change:

refers to the change in wording or the addition of the information that was not described in the earlier version.

Document Issues

The document issues are as follows:

01 (2011-03-31)

Draft A (2011-01-15)

01 (2011-03-31)

This is the commercial release of GBSS13.0.

Compared with issue Draft A (2011-01-15) of GBSS13.0, this issue incorporates no change.

Draft A (2011-01-15)

This is the draft release of GBSS13.0.

Compared with issue 01 (2010-06-30) of GBSS12.0, issue Draft A (2011-01-15) of GBSS13.0 has no change.

GSM BSS

PS Power Control 2 Overview



2-1

2 Overview

PS power control is a technology based on which the transmit power of the MS or BTS is adjusted according to the quality of the link over the Um interface after setup. In this manner, the transmit power is reduced without affecting the link quality, thus reducing the network interference and expanding the network capacity.

The benefits of PS power control are as follows:

Reducing the network interference

After PS power control is enabled, signals received by the MS or BTS remain stable, adjacent-channel interference is reduced, and carrier interference ratio (CIR) is increased.

Reducing power consumption

When the transit power of the MS and BTS decreases, the maximum standby and speech time of the MS will increase, and less power will be required by the BTS.

Improving voice quality

After downlink PS power control is enabled, the interference to TCHs is reduced, thereby improving the KPIs of CS services.

There are two types of PS power control:

Uplink PS power control

Uplink PS power control is applicable to the MS. Uplink PS power control is used to adjust the transmit power of the MS, so that the receive signal strength of the BTS remains stable, and adjacent-channel interference and MS power consumption are decreased.

Downlink PS power control

Downlink PS power control is applicable to the BTS. Downlink PS power control is used to adjust the transmit power of the BTS, so that the receive signal strength of the MS remains stable, and adjacent-channel interference and BTS power consumption are decreased.

GSM BSS

PS Power Control 3 Uplink PS Power Control



3-1

3 Uplink PS Power Control

Uplink PS power control is classified into uplink open loop power control and uplink closed loop power control. Currently, only uplink open loop power control is supported.

To enable the uplink open loop power control, set the ALPHA parameter to a value except 0(0,0).

Provided that the uplink and the downlink have the same path loss, the uplink open loop power control enables the MS to adjust the output power based on the RX level.

For all the PDCHs allocated to the GPRS/EGPRS MS, the output power is calculated as follows:

PCH = min (Γ0 - ΓCH - α x (C + 48), PMAX)

Here,

ΓCH is sent through the RLC/MAC radio block to the MS. For details, see 3GPP TS 44.060. By default, ΓCH is the value of the GAMMA parameter.

Γ0 is 39 dBm for GSM850 and GSM900, and 36 dBm for DCS1800 and PCS1900.

α is a system-level parameter. It is broadcast on the PBCCH or sent through an RLC/MAC control message to the MS. For details, see 3GPP TS 44.018 and 3GPP TS 44.060. By default, α is the value of ALPHA.

C is the filtered RX signal strength.

PMAX is the maximum transmit power of the MS allowed in the cell. It can be specified by the cell-level parameter FMSMAXOPCC.

The channel on which the MS measures the RX level for uplink power control is specified by PCMEASCHAN, which can be BCCH or PDCH.

On receiving an RLC/MAC control message that contains a new α or ΓCH, the MS performs power control calculation and update after two radio block periods. When an MS moves to a new cell, the MS uses the maximum transmit power PMAX before it receives a new power control parameter.

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GSM BSS

PS Power Control 4 Downlink PS Power Control



4-1

4 Downlink PS Power Control

4.1 Principles

The downlink PS power control is implemented through the collaboration of the BSC, BTS, and MS. Figure 4-1 shows the collaboration between NEs.

Figure 4-1 Collaboration between NEs

The procedure is described as follows:

1. The MS measures the quality of each downlink radio block.

2. The MS sends the downlink quality information (MEAN_BEP or RXQUAL) to the BSC through PS downlink acknowledge messages.

3. The BSC pre-processes (filters) the downlink quality information.

4. The BSC makes the downlink PS power control decision according to the downlink quality and the power control threshold. If power adjustment is needed, the BSC calculates the power attenuation value.

5. The BSC sends the power attenuation value to the BTS.

6. The BTS adjusts the transmit power for the current radio block according to the power attenuation value.

4.2 MR Processing

The bit error probability (BEP) measurement report (MR) from the MS reflects the receive quality. The BEP MR contains the mean bit error probability (MEAN_BEP) and CV bit error probability (CV_BEP). To minimize the effect on the decision due to sudden changes of a specific MR, the BSC filters the BEP MRs from the MS by calculating the MEAN_BEP and CV_BEP of each TBF. MEAN_BEP reflects the mapping between the measured BEP value and the CIR, that is, the CIR of the TBF that carries the MS can be obtained through the downlink BEP MR of the MS.

The BSC calculates the most appropriate coding scheme for the TBF that carries the MS according to the MEAN_BEP.

4.3 Decision Algorithms

To enable the downlink power control decision, set the SUPPSDLPC parameter to YES(Yes).

In the EGPRS, each coding scheme (MCSi) maps to a MEAN_BEP range [BEPi, min, BEPi, max]. Then, based on the MEAN_BEP range and the link adaptation mode, the CIR range can be obtained, as shown in Table 4-1.

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4-2

Each coding scheme maps to one target CIR range [CIRi, min, CIRi, max]. The target CIR (CIRi, target) is the one when the signal quality of the network under that coding scheme is the best. It can be obtained by setting the TGTCIRPOS parameter. CIRi, upper and CIRi, lower are determined by TGTCIRPOS (TGT_LOC) and TGTCIROFFSET (TGT_OFFSET). Here,

CIRi, target = min (CIRi, min + TGT_LOC, CIRi, max)

CIRi, lower = max (CIRi, target – TGT_OFFSET, CIRi, min)

CIRi, upper = min (CIRi, target + TGT_OFFSET, CIRi, max)

Table 4-1 Mapping between CIR range and EGPRS downlink coding scheme

LA/IR Mode LA Mode

Coding Scheme

MEAN_BEP Range

CIR Range (dB) MEAN_BEP Range

CIR Range (dB)

MCS5 5~6 10~1 7~9 11~13

MCS6 11~16 14~19 11~16 14~19

MCS7 17~21 19~27 18~21 21~27

MCS8 22~26 27~34 22~27 27~35

MCS9 27~31 34~40 28~31 35~40

LA/IR mode means that both the link adaption (LA) mode and the incremental redundancy (IR) mode exist in the current link. For details, see of EGPRS Coding Scheme Adjustment Algorithm in the GPRS/EGPRS Link Quality Control Parameter Description.

The triggering conditions of the downlink power control are as follows:

1. The PDCH that carries the current MS is in the same frequency band as the BCCH.

2. The current TBF coding scheme is higher than the coding scheme threshold for triggering the downlink power control.

The coding scheme of EGPRS services is fixed to MCS9.

3. The most appropriate coding scheme of the TBF that carries the MS is stable. For the stability check, see 4.4 Coding Scheme Stability Check.

4. The current CIR is greater than the CIRi, upper corresponding to the most appropriate coding scheme of the TBF that carries the MS, or the current CIR is smaller than the CIRi, lower corresponding to the most appropriate coding scheme of the TBF that carries the MS.

4.4 Coding Scheme Stability Check

To avoid frequent change of the coding scheme in the downlink power control, the coding scheme stability check is required before the downlink power control. The downlink power control can be enabled only when the coding scheme is stable.

P/N criterion is applied in the coding scheme stability check. That is, within the number of times specified by MCSSTATTHR, if the number of times that the coding scheme is used is greater than or equal to MCSSTABTHR, the coding scheme is stable.

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4-3

The BSC obtains and uses the most appropriate coding scheme according to the MEAN_BEP. In this case, the time of using the coding scheme is incremented by one. Within the number of times specified by MCSSTATTHR, if the use time of the coding scheme is greater than or equal to MCSSTABTHR, the coding scheme is stable and thus the downlink power control can be performed on the TBF that carries the MS.

4.5 Calculation of the Dynamic Power Attenuation Value

When the triggering conditions of the downlink power control are met, the BSC starts to perform downlink power control on the TBF that serves the MS. In this step, the BSC calculates the power adjustment value first. Based on the power adjustment value, the BSC calculates the downlink dynamic power attenuation value.

The procedure for calculating the power adjustment value is as follows:

If the current coding scheme that passes the stability check is lower than the previously used coding scheme, the power of the downlink TBF must be increased. The BTS transmits this downlink TBF at the maximum power.

If the current CIR is smaller than the lower threshold of the CIR range corresponding to the current coding scheme, the power of the downlink TBF must be improved by DP. DP is the accumulated attenuation value of the power relative to the (BCCH - P0), where P0 is the value of the DLPCINITPR parameter.

If the current CIR is greater than the upper threshold of the CIR range corresponding to the current coding scheme, the power of the downlink TBF must be decreased. The decreased value is obtained according to the current CIR and the target CIR but cannot exceed the value of MAXPCSTEP. MAXPCSTEP is used to avoid the excessive power adjustment.

PR is the dynamic power attenuation value relative to (BCCH level – P0), where P0 is the value of the DLPCINITPR parameter. PR can be calculated on the basis of power adjustment value. In dynamic power control, the power control step is determined by PSPCPRES. In addition, the power control step must be smaller than or equal to MAXPCSTEP.

The power attenuation value for Dummy control blocks is calculated as follows:

For downlink Dummy control blocks that do not carry USF (USF is equal to 7), a fixed power attenuation granularity is used, which is determined by the DummyPRGran parameter.

For downlink Dummy control blocks that carry USF (USF is not equal to 7), the formula for calculating the power attenuation value is as follows: (Current C/I – CS1 target C/I) x USFDummyPCFactor/10. This power attenuation value is not restricted by MAXPCSTEP but is restricted by the maximum power control value 10 dB.

Where, Current C/I maps the quality of link carrying the downlink TBF that the USF corresponds to. CS1 target C/I maps the CS1 coding scheme.

If the power attenuation value of the downlink Dummy control blocks (including those carry USF and do not carry USF) exceeds 15, which is the maximum value of the Power Reduce (PR) defined in the TRAU/PTRAU frame, multiplied by PSPCPRES, then the power attenuation value for the downlink Dummy control blocks is 15.

4.6 Dynamic Power Control

The BSC does not perform dynamic power control on the PBCCH, PCCCH, and PTCCH. These channels use fixed output power that is specified by the BTS. The BSC performs dynamic power control on the PDTCH and PACCH. That is, the BTS dynamically regulates the output power on the PDTCH and PACCH. The details are as follows:



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4-4

The power attenuation value of the PTCCH is Pb. The output power on the PTCCH equals PBCCH minus Pb. The BTS uses fixed output power on the PTCCH. The PBCCH equals the maximum output power of the BCCH TRX minus power backup. Pb is the value of the PB parameter.

The BTS determines the power attenuation value of other PDCH channels based on the value of the DLPCINITPR parameter and the dynamic power attenuation value PR. The power attenuation value of other PDCH channels equals P0 plus PR. The output power on these channels equals PBCCH minus the sum of P0 and PR. The details are as follows:

− The PR of the PBCCH and PCCCH = max{Pb - P0, 0}. The power attenuation value is P0 or Pb. The BTS uses fixed output power on the PBCCH and PCCCH. The fixed output power equals PBCCH minus P0 or PBCCH minus Pb.

− If the BSC disables PS downlink closed loop power control on the PDTCH and PACCH, the values of P0 and PR are both zero, and the value of power attenuation value is zero. That is, the BTS uses fixed output power, PBCCH, on the PDTCH and PACCH. If the BSC enables PS downlink closed loop power control on the PDTCH and PACCH, the BTS dynamically regulates the output power on these two channels. The power attenuation value of these two channels equals the sum of P0 and PR. The output power on these two channels equals the PBCCH minus the sum of P0 and PR.

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GSM BSS

PS Power Control 5 Engineering Guidelines



5-1

5 Engineering Guidelines

PS power control is applicable in all networking scenarios. The gain of PS power control, however, varies with the frequency reuse pattern and the distance between sites:

When the frequencies are highly reused and the distance between sites is short, the radio interference within the system is great, and thus the gain of PS power control is great.

When the frequencies are loosely reused and the distance between sites is long, the radio interference within the system is small, and thus the gain of PS power control is small.

When PS power control is used together with frequency hopping, the co-channel interference and the adjacent-channel interference in the system can be obviously reduced, however, the use of frequency hopping decreases the gain of the PS power control.

If the BTSs are enabled with transmit diversity, the path loss and shadow attenuation are decreased, and thus the gain of PS power control is improved.

In the case of a concentric cell, the gain of the PS power control in the overlaid subcell is greater than that in the underlaid subcell.

GSM BSS

PS Power Control 6 Parameters



6-1

6 Parameters

Table 6-1 Parameter description

Parameter ID NE MML Command Description

ALPHA BSC6900 SET GCELLPSPWPARA(Optional) Meaning: It is used to perform open loop power control. Alpha parameter is used by the MS to calculate the output power PCH of the uplink PDCH. This parameter is used to set the reduced class of the Tx power of the MS, in correspondence with the path loss, when the GPRS dynamic power control is enabled.

GUI Value Range: 0(0.0), 1(0.1), 2(0.2), 3(0.3), 4(0.4), 5(0.5), 6(0.6), 7(0.7), 8(0.8), 9(0.9), 10(1.0)

Actual Value Range: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10

Default Value: 6

DLPCINITPR BSC6900 SET GCELLPSPWPARA(Optional) Meaning: Initial attenuation value of the transmit power for other channel relative to the maximum BCCH transmit power for PS downlink power control

GUI Value Range: DB0(0dB), DB2(2dB), DB4(4dB), DB6(6dB), DB8(8dB), DB10(10dB), DB12(12dB), DB14(14dB), DB16(16dB), DB18(18dB), DB20(20dB), DB22(22dB), DB24(24dB), DB26(26dB), DB28(28dB), DB30(30dB)

Actual Value Range: DB0, DB2, DB4, DB6, DB8, DB10, DB12, DB14, DB16, DB18, DB20, DB22, DB24, DB26, DB28, DB30

Default Value: DB0



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6-2

DummyPRGran BSC6900 SET GCELLPSPWPARA(Optional) Meaning: Set the power reduce granularity for the Dummy control blocks with reserved Uplink State Flag (USF). When the parameter is set to 0, power control is not performed on the Dummy control blocks with reserved USF.

GUI Value Range: 0~15

Actual Value Range: 0~15

Default Value: 15

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6-3

FMSMAXOPCC BSC6900 SET GCELLCCCH(Optional) Meaning: Maximum transmit power level of MSs. As one of the cell reselection parameters in system message 3, this parameter is used to control the transmit power of MSs. For details, see GSM Rec. 05.05.

In a GSM900 cell, the maximum power control level of an MS ranges from 0 to 19, corresponding respectively to the following values (unit: dBm): 43, 41, 39, 37, 35, 33, 31, 29, 27, 25, 23, 21, 19, 17, 15, 13, 11, 9, 7, and 5.Generally, the maximum transmit power supported by an MS is level 5 (corresponding to 33 dBm). The minimum transmit power supported by an MS is level 19 (corresponding to 5 dBm). Other transmit power levels are reserved for high-power MSs.

In a GSM1800 or GSM1900 cell, the maximum power control level of an MS ranges from 0 to 31, corresponding respectively to the following values (unit: dBm): 30, 28, 26, 24, 22, 20, 18, 16, 14, 12, 10, 8, 6, 4, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 36, 34, and 32. Generally, the maximum transmit power supported by an MS is level 0 (corresponding to 30 dBm). The minimum transmit power supported by an MS is level 15 (corresponding to 0 dBm). Other transmit power levels are reserved for high-power MSs.



Default Value: 5

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6-4

GAMMA BSC6900 SET GCELLPSPWPARA(Optional) Meaning: Expected signal receiving strength on the BTS side when GPRS dynamic power control is implemented



Default Value: 12

MAXPCSTEP BSC6900 SET GCELLPSPWPARA(Optional) Meaning: Maximum step size of power control



Default Value: 1

MCSSTABTHR BSC6900 SET GCELLPSPWPARA(Optional) Meaning: Threshold for the times of using current coding scheme in a measurement period. This parameter is used to determine whether the coding scheme is stable. When the number of using the current coding scheme in a measurement period is equal to this parameter, the coding scheme is stable.



Default Value: 8

MCSSTATTHR BSC6900 SET GCELLPSPWPARA(Optional) Meaning: Threshold for the times of coding scheme adaptation (measurement period in which the stability of a code scheme can be determined). That is, the coding scheme stability can be determined only when the times of coding scheme adaptation is equal to this parameter.



Default Value: 10

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6-5

PB BSC6900 SET GCELLPSPWPARA(Optional) Meaning: BTS power attenuation on the measured PBCCH

GUI Value Range: DB0(0dB), DB2(-2dB), DB4(-4dB), DB6(-6dB), DB8(-8dB), DB10(-10dB), DB12(-12dB), DB14(-14dB), DB16(-16dB), DB18(-18dB), DB20(-20dB), DB22(-22dB), DB24(-24dB), DB26(-26dB), DB28(-28dB), DB30(-30dB)

Actual Value Range: DB0, DB2, DB4, DB6, DB8, DB10, DB12, DB14, DB16, DB18, DB20, DB22, DB24, DB26, DB28, DB30

Default Value: DB2

PCMEASCHAN BSC6900 SET GCELLPSPWPARA(Optional) Meaning: Channel used for the measured receiving power. It is used to set the measured receiving power level of the channel and control the power of the uplink.

GUI Value Range: BCCH(BCCH), PDCH(PDCH)

Actual Value Range: BCCH, PDCH

Default Value: PDCH

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6-6

PSPCPRES BSC6900 SET GCELLPSPWPARA(Optional) Meaning: This parameter indicates the minimum granularity of BTS output power during PS downlink power control.

GUI Value Range: 0.2dB(0.2dB), 0.4dB(0.4dB), 0.6dB(0.6dB), 0.8dB(0.8dB), 1.0dB(1.0dB), 1.2dB(1.2dB), 1.4dB(1.4dB), 1.6dB(1.6dB), 1.8dB(1.8dB), 2.0dB(2.0dB)

Actual Value Range: 0.2dB, 0.4dB, 0.6dB, 0.8dB, 1.0dB, 1.2dB, 1.4dB, 1.6dB, 1.8dB, 2.0dB

Default Value: 0.6

SUPPSDLPC BSC6900 SET GCELLPSPWPARA(Optional) Meaning: Switch for PS downlink closed-loop power control

GUI Value Range: NO(No), YES(Yes)

Actual Value Range: NO, YES

Default Value: NO

TGTCIROFFSET BSC6900 SET GCELLPSPWPARA(Optional) Meaning: Maximum offset of the target CIR. This parameter, together with target CIR, is used to determine the value range of the target CIR.



Default Value: 2


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6-7

TGTCIRPOS BSC6900 SET GCELLPSPWPARA(Optional) Meaning: Position corresponding to the target CIR in the value range for the specified coding scheme, that is, the delta between the target CIR and the minimum value in the value range.



Default Value: 3

USFDummyPCFactor BSC6900 SET GCELLPSPWPARA(Optional) Meaning: Set the power reduce granularity for the Dummy control blocks with valid USF. When the parameter is set to 0, power control is not performed on the Dummy control blocks with valid USF.



Default Value: 3


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PS Power Control 7 Counters



7-1

7 Counters

Table 7-1 Counter description

Counter ID Counter Name Counter Description Feature ID Feature Name

1282449300 POWER.CONTROL.PERCENTAGE.DTX.SUM

R9217:Sum of Power Control Percentages of Untransmitted Packet Downlink Dummy Control Blocks over the PDCH with DTX Enabled

GBFD-119504 PS Power Control

1282449301 POWER.CONTROL.PERCENTAGE.EGPRS.DATA.SUM

R9218:Sum of Power Control Percentages of Transmitted Downlink EGPRS Data Blocks


1282449302 POWER.CONTROL.PERCENTAGE.DUMMY.WITH.VALID.USF.SUM

R9219:Sum of Power Control Percentages of Transmitted Packet Downlink Dummy Control Blocks with Valid USF


1282449303 POWER.CONTROL.PERCENTAGE.DUMMY.WITH.RESERVED.USF.SUM

R9220:Sum of Power Control Percentages of Transmitted Packet Downlink Dummy Control Blocks with Reserved USF


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PS Power Control 8 Glossary



8-1

8 Glossary

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

Glossary.htm

GSM BSS

PS Power Control 9 Reference Documents



9-1

9 Reference Documents

[1] 3GPP TS 45.008: "RF power control"

[2] BSC6900 Feature List

[3] BSC6900 Optional Feature Description

[4] BSC6900 GSM Parameter Reference

[5] BSC6900 GSM MML Command Reference

[6] BSC6900 GSM Performance Counter Reference

ps power control

Documents

rlc mac control message

receive signal strength

bsc6900 set gcellpspwpara

dummy control blocks

ps power control

bts dynamically regulates

power reduce granularity

transmit power levels