Intelligent Shutdown of TRX Due to PSU Failure

Intelligent Shutdown of TRX Due to PSU Failure Feature Parameter Description

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

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BSS Intelligent Shutdown of TRX Due to PSU Failure Contents

Issue 01 (2010-01-12) Huawei Proprietary and Confidential Copyright Huawei Technologies Co., Ltd

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

1.1 Scope ............................................................................................................................................ 1-1 1.2 Intended Audience ........................................................................................................................ 1-1 1.3 Change History.............................................................................................................................. 1-1

2 Overview of Intelligent Shutdown of TRX Due to PSU Failure .....................................2-1

3 Technical Description ..............................................................................................................3-1

4 Parameters .................................................................................................................................4-1

5 Counters......................................................................................................................................5-1

6 Glossary ......................................................................................................................................6-1

7 Reference Documents .............................................................................................................7-1

BSS Intelligent Shutdown of TRX Due to PSU Failure 1 Introduction


1-1

1 Introduction 1.1 Scope This document describes the feature of the intelligent shutdown of TRX due to PSU failure.This feature applies to only the scenario where the BTS uses the AC power input.

1.2 Intended Audience This document is intended for:

z Personnel who need to understand radio bearer services z Personnel who work with Huawei products z Personnel who have a certain understanding of the electric power

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:

z Feature change: refers to the change in the intelligent shutdown of TRX due to PSU failure feature of a specific product version.

z 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:

z 01 (2010-01-12)

01 (2010-01-12) This is the initial issue of GBSS9.0.

BSS Intelligent Shutdown of TRX Due to PSU Failure

2 Overview of Intelligent Shutdown of TRX Due to PSU Failure


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2 Overview of Intelligent Shutdown of TRX Due to PSU Failure In the scenario where the BTS uses the AC power input, the power supply unit (PSU) converts the AC power into the DC power to provide power supply for the boards of a BTS. Generally, multiple PSUs are required to provide sufficient electricity for a BTS. The PSUs work in the parallel connection. If one or several PSUs are faulty, the load of the PSUs that work properly increases. As a result, all PSUs may stop working due to overcurrent protection, and thus all the services processed on the BTS are disrupted.

To prevent such a problem, the function of the intelligent shutdown of TRX due to PSU failure is introduced to Huawei GSM BSS. With this function, when one or several PSUs are faulty, the BTS shuts down the power amplifiers of the TRXs that consume excessive electricity, based on the power supply capability of the PSUs that work properly. In this manner, the rest of TRXs continue to work normally, thus minimizing the impact of service disruption

BSS Intelligent Shutdown of TRX Due to PSU Failure 3 Technical Description


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3 Technical Description When some PSUs are faulty, the PSUs that work properly cannot provide the BTS with sufficient power. In this case, the BTS shuts down the power amplifiers of some TRXs to reduce the power consumption of a site. Thus, the TRXs whose power amplifiers are still powered on can work normally.

When an alarm regarding the PSU fault is reported, the BTS calculates the number of TRXs whose power amplifiers need to be shut down on the basis of the power supply capability of the PSUs that work properly. This ensures that the power consumption of the BTS does not exceed the power supply capability supported by the remaining PSUs after the power amplifiers of some TRXs are shut down.

The principle of the intelligent shutdown of TRX due to PSU failure is described as follows: The BTS calculates the power supply capability of the PSUs that work properly according to the PSU type and quantity and calculates the power consumption of the BTS according to the TRX type and quantity. Then, the BTS shuts down the power amplifiers of some TRXs by comparing the difference between the power supply capability and the power consumption. When Tran. Cabinet Configured is set to CONFIG, the power consumption of the transmission cabinet needs to be considered for the calculation of BTS power consumption. After the power amplifiers of some TRXs are shut down, the power consumption of the BTS is expected not to exceed the power supply capability of the PSUs that work properly.

When the BTS determines the TRXs whose power amplifiers need to be shut down, the following factors are considered:

1. The TRX whose Is Main BCCH TRX is set to NO is preferentially selected.

2. The TRX whose TRX Board Type is set to a multi-carrier TRX board type is preferentially selected.

The multi-carrier TRX boards consist of the MRRU, MRFU, GRRU, and GRFU.

3. The operation of the TRX processing the GSM services is preferentially ensured by setting Service Priority Policy to GSM_PRIOR.

After determining the TRXs whose power amplifiers need to be shut down, the BTS reports the information to the BSC. On receipt of the information, the BSC does not assign new services to the TRXs whose power amplifiers are to be shut down. After all the services carried on these TRXs are released normally, the BTS shuts down the power amplifiers of the TRXs.

When the faulty PSUs recover, the BTS immediately reports the information to the BSC. Then, the BSC powers on the TRXs whose power amplifiers are shut down

BSS Intelligent Shutdown of TRX Due to PSU Failure 4 Parameters


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4 Parameters This chapter describes the parameters related to intelligent shutdown of TRX due to PSU failure.

For the description of each parameter, see Table 4-1. For the default value, value ranges, and MML commands of each parameter, see 0

Table 4-1 Parameter description (1)

Parameter Description

Is Main BCCH TRX Whether to enable the TRX to carry the main BCCH in the cell

Service Priority Policy The parameter specifies which type of service TRXs should be preferentially processed when the PSU is faulty.

Tran. Cabinet Configured Whether to configure the transmission cabinet. The BTS uses this parameter to calculate the number of TRXs to be shut down.

TRX Board Type Type of the TRX board bound to the TRX

Table 4-2 Parameter description (2)

Parameter Default Value

GUI Value Range

Actual Value Range

Unit MML Command Impact

Is Main BCCH TRX NO

NO(No), YES(Yes) NO, YES None ADD GTRX TRX

Service Priority Policy

GSM_PRIOR

GSM_PRIOR(GSM Traffic Prior), UMTS_PRIOR(UMTS Traffic Prior)

GSM_PRIOR, UMTS_PRIOR None SET BTSPSUFP BTS

Tran. Cabinet Configured

NOT_CONFIG

NOT_CONFIG(NOT CONFIGURED), CONFIG(CONFIGURED)

NOT_CONFIG, CONFIG None SET BTSPSUFP BTS

TRX Board Type None

TRX(TRX), TRU(TRU/DTRU), QTRU(QTRU), DRRU(DRRU), DRFU(DRFU), MRRU(MRRU), MRFU(MRFU), GRFU(GRFU), GRRU(GRRU), BTS3900B(BTS3900B), BTS3900E(BTS3900E)

TRX, TRU, QTRU, DRRU, DRFU, MRRU, MRFU, GRFU, GRRU, BTS3900B, BTS3900E None

ADD TRXBIND2PHYBRD TRX

BSS Intelligent Shutdown of TRX Due to PSU Failure 5 Counters


5-1

5 Counters For the counters,see the BSC6900 GSM Performance Counter Reference.

BSS Intelligent Shutdown of TRX Due to PSU Failure 6 Glossary


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

BSS Intelligent Shutdown of TRX Due to PSU Failure 7 Reference Documents


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7 Reference Documents z BSC6900 Feature List z BSC6900 Basic Feature Description z BSC6900 GSM Parameter Reference z BSC6900 GSM MML Command Reference z BSC6900 Performance Counter Reference

1 Introduction 1.1 Scope 1.2 Intended Audience 1.3 Change History 2 Overview of Intelligent Shutdown of TRX Due to PSU Failure 3 Technical Description 4 Parameters 5 Counters 6 Glossary 7 Reference Documents