Antenas supervision-UMTS.pdf

Antenna System SupervisionRBS 6000

DESCRIPTION

3/1551-LZA 701 6008 Uen B

Copyright

© Ericsson AB 2011. All rights reserved. No part of this document may bereproduced in any form without the written permission of the copyright owner.

Disclaimer

The contents of this document are subject to revision without notice due tocontinued progress in methodology, design and manufacturing. Ericsson shallhave no liability for any error or damage of any kind resulting from the useof this document.

Trademark List

All trademarks mentioned herein are the property of their respective owners.These are shown in the document Trademark Information.

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Contents

Contents

1 Overview 1

2 Antenna System Hardware Units 3

2.1 RRU 3

2.2 ASC 4

2.3 TMA 4

2.4 ATMA 4

2.5 RETU 4

2.6 ARETU 5

2.7 RIU 5

3 Antenna System Configuration 7

4 Supervision Methods 9

4.1 Antenna Supervision Activation and Tuning 9

4.2 Antenna Supervision 10

4.3 Auxiliary Units DC Supervision 11

5 Antenna System Configurations and SupervisionOverview 13

5.1 No Auxiliary Units 13

5.2 ASC/ATMA 14

5.3 RRU and ARETU/RETU 15

5.4 ASC/ATMA and ARETU/RETU 17

5.5 RIU and ARETU/RETU 18

5.6 TMA 19

5.7 TMA, RIU and ARETU/RETU 20

5.8 TMA with External Power Supply 21

6 Supervision Overview 23

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Antenna System Supervision

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Overview

1 Overview

This document describes the supervision of cables and antenna systems inRBS 6000, which uses Wideband Code Division Multiple Access (WCDMA)technology.

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Antenna System Hardware Units

2 Antenna System Hardware Units

This section describes the hardware units of the antenna system.

The hardware units are as follows:

• Remote Radio Unit (RRU)

• Antenna System Controller (ASC)

• Tower Mounted Amplifier (TMA)

• Remote Electrical Tilt Unit (RETU)

• Remote electrical tilt Interface Unit (RIU)

• Also supported is the Antenna Interface Standards Group/3rd GenerationPartnership Project (AISG/3GPP) defined components ATMA and ARET.

Note: This document only describes solutions with ASC and the configurationsbased on the AISG 2.0/3GPP specifications are neither described,nor handled or tested by Ericsson.

2.1 RRU

The RRU with ASC support is not a part of the antenna hardware, butcommunicates with it by sending DC through the feeder, which is used for eitherof the following alternatives:

• Supplying auxiliary units such as RETU and TMA with DC power.

• Supervising cables and antennas in the antenna system from a 3 V DCsource.

The RRU without ASC support has the following functions:

• Power supply to the RETU.

• Communication with RETU through the RETU cable.

• Supervising antennas in the antenna system from a 3 V DC source.

For more information on RRU, refer to Technical Product Description, RRUand Remote Radio Unit Description.

Note: VSWR support for RRUs applies to certain models and softwareversions. Refer to Compatibilities for Hardware and Software.

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2.2 ASC

The ASC is an auxiliary unit with the following main functions:

• Amplifying uplink signals

The uplink amplification is set with respect to the feeder attenuation.

• Supplying power to a ARETU/RETU

• Supervising the antenna

ASC communication passes through branch A, branch B, or both. For moreinformation on the ASC, see ASC Description.

2.3 TMA

The TMA has the following characteristics:

• Offers uplink amplification

• Powered by the RU through the feeders

• Can also be powered by an external power source

• Has no communication

2.4 ATMA

The ATMA is an alternative to ASC and TMA and has the followingcharacteristics:

• Amplification of uplink signals

The uplink amplification is set with respect to the feeder attenuation.

• RS 485 interface towards the RBS.

• Power supply to an ARETU.

• No supervision of the antenna.

The ATMA can be used when both TMA and Remote Electrical Tilt (RET)functionalities are needed.

2.5 RETU

The RETU contains a communications interface and a step motor to engagethe tilt mechanism of the antenna.

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Antenna System Hardware Units

For more information on the RETU, see the RETU documentation in the RBSSite Products CPI library.

Using RETU in an RU configuration:

• The RETU is powered by the RU and is supervised by the ASC.

• The RETU is connected to the ASC, and communicates with the RBSthrough antenna branch A.

• In systems with no ASC, the RETU is powered by the RU and is supervisedby the RIU that is connected to antenna branch A, but is however unableto issue alarms.

2.6 ARETU

The ARETU is an alternative to the RETU. As in the case of the RETU, theARETU contains a communication interface and a motor to engage the antennatilt mechanism. The ARETU includes an RS485 interface as specified in theAISG 2.0/3GPP standard. However, from a software point of view there is nodifference between a RIU/ARET configuration and an ARET with includedmodem.

Using ARETU in an RU configuration:

• The ARETU is powered by the RU.

• The ARETU can be connected to the ASC, and communicates with theRBS through antenna branch A.

• The ARETU can also be used without ASC.

� In this case, the ARETU is powered by the RU and is supervisedthrough the RIU that is connected to the antenna branch A, but ishowever unable to generate alarms.

� If the RIU is not present, the supervision is made directly from the RBSthrough the antenna branch A.

• The ARETU is supervised through the ATMA.

2.7 RIU

The RIU is an interface to the RETU used in macro RBS antenna systemswhere ASC is not used. The RIU is used for transfer of DC supply and forcommunication between the RBS and the RETU/ARET.

The RIU is installed close to the antenna and connected to antenna branch A,to the ANT A antenna connector, and to the RETU/ARET.

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The RIU can also be used in antenna systems with a TMA and has a DCsupply switch for transferring DC power supply to the TMA. In this case, theRIU is connected to antenna branch A, to the RBS A TMA connector, and tothe RETU/ARET.

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Antenna System Configuration

3 Antenna System Configuration

The antenna system is configured in Element Manager Wizards – SiteEquipment Wizard.

For information on how to calculate the feeder attenuation and the electricaldelay, see the antenna system test instruction in the RBS Site Products CPIlibrary.

Note: The total attenuation and delay values depend on the values for thefeeder and jumper cables in the antenna systems. See Section 5 onpage 13.

See also Managed Object Model (MOM) RBS, sections Antenna Feeder CableParameters and Antenna Jumper Cable Parameters respectively.

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Supervision Methods

4 Supervision Methods

Depending on antenna system configuration, different supervision methods areused. This is described in Section 4.2 on page 10.

These methods are selected by the system, not by the user.

4.1 Antenna Supervision Activation and Tuning

By default, no antenna supervision is activated and the supervision thresholdparameter is set to 0 (percent).

Antenna supervision on applicable sector is activated by entering antennasupervision threshold values in the antenna branch configuration page whenrunning the Site Equipment wizard. This is usually performed during the SiteEquipment Configuration. See Element Manager Wizards.

Antenna supervision can be deactivated by setting the supervision thresholdto 0.

When activated, supervision on both branch A and branch B are activatedand default value for the attribute is set to 80. The branches are then tunedseparately.

The attribute value for all branches with an ASC must be set to 10.

Change the value in the RBS Element Manager (EM) by modifying theantennaSupervisionThreshold attribute on the AntennaBranchManaged Object (MO) as shown in Figure 1.

Figure 1 Sector Antennas Expanded

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For information on how to calculate the supervision threshold value, seeManaged Object Model (MOM) RBS, section Antenna Branch Parameters.

When a system is master in a mixed mode in multistandard configuration,the configuration on the other system should be consistent. Therefore,theantennaSupervisionThreshold attribute should not be configured inWCDMA if the antenna system is handled by LTE.

For more information about antenna supervision and configuration for mixedmode in multistandard, see Mixed Mode in Multistandard RBS.

4.2 Antenna Supervision

This section describes methods for supervising the antenna.

4.2.1 DC Resistance

3 V DC is sent by the Radio Unit (RU). The resistance must be below thethreshold value, or an alarm is generated. Antenna systems supervised by thismethod require antennas with a DC short between the inner and the outerconductor, that is, tuned coil.

DC resistance is used when there are no auxiliary units between the RBS andthe antenna. The default attribute value can be changed by the user.

For information on how to calculate the threshold value, see Managed ObjectModel (MOM) RBS.

In cases where branch B is not used, the value for branch B is set to 0 bythe user.

4.2.2 Voltage Standing Wave Ratio

Voltage Standing Wave Ratio (VSWR) detection requires a TX signal. A branchwith no TX signal cannot be supervised by VSWR detection.

The ASC supervises the antenna by detecting the VSWR on branch A andbranch B when they are used for TX. The threshold setting is irrelevant for abranch that is not used for TX, and supervision will always be switched off.

The TMA does not have antenna supervision.

The RUs supervise the antenna by detecting the VSWR on branch A only(when there is no ASC). It is recommended to set the attribute value to 10 inthe Site Equipment wizard.

The B branch of the RU with no TMA is recommended to be set at 80 for DCsupervision. Where branch A or branch B, or both is not used for supervision,

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Supervision Methods

the value for branch A or branch B, or both is set to 0 by the user, whichis equivalent to deactivation.

This means that where the RU detects VSWR on branch A and 3 V DC onbranch B, the attribute value for branch A should be changed to 10 by the user.The attribute value for branch B remains at 80.

4.3 Auxiliary Units DC Supervision

This section describes methods used by the RU to supervise the ASC andthe TMA.

4.3.1 DC Current

The RU supervises ASC/TMA DC consumption. An alarm is generated if DCconsumption is too high or too low.

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Antenna System Configurations and Supervision Overview

5 Antenna System Configurations andSupervision Overview

This section describes the different antenna system configurations. How thesupervision of the antenna system is performed depends on whether auxiliaryunits are used.

Note: For configurations with auxiliary units between the RU and the antenna,these units are not mentioned in the tables for the VSWR supervisionmethod. The RU supervises the whole path towards the antenna andthe alarm does not indicate which unit is causing the alarm.

5.1 No Auxiliary Units

This section describes antenna systems with no auxiliary units as shown inFigure 2.

RBS

RU

Branch A

Branch B

Antenna

RRUMU

Alternative Configuration

RBS internal jumper cable

RBS jumper cable

Antenna feeder cable

Feeder jumper cable

Ge1612A

Figure 2 Antenna System with No Auxiliary Units

5.1.1 Supervision

This section describes antenna system supervision with no auxiliary units andpossible supervision methods are described in Table 1.

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Table 1 Possible Supervision Methods

Supervision Type Method Alarm Generated

RU → Antenna(1) DC resistance

RU → Antenna VSWR

RRU → Antenna VSWR(2) on branch ADC resistance on branchB

AntennaSystemProblem

(1) "RU → Antenna" is short for "RU supervision of the antenna(2) When supported by the RRU

5.2 ASC/ATMA

This section describes antenna systems with ASC/ATMA as shown in Figure 3.

RBS

RU

Branch A

Branch B


RBS jumper cable


Feeder jumper cable

Antenna jumper cable

ATMA/ASC

Antenna

RRU MU


Ge1613A

Figure 3 Antenna System with ASC/ATMA

Branch A contains control signalling to the ASC.

5.2.1 Supervision

This section describes antenna systems supervision with ASC/ATMA andpossible supervision methods are described in Table 2.

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– CommunicationLostWithAsc

RU/RRU → ASCDC current

FeederCurrentTooHighBranchA (or B)FeederCurrentTooLowBranchA (or B)(1)

RU → Antenna(2)

ASC → Antenna

RU/RRU → ATMA

VSWR(3) AntennaSystemProblem

ATMA – –

(1) The alarm is controlled by the AntennaBranch::lowCurrentSupervision MO attribute(2) Supervision only when using ATMA(3) When supported by the RRU

5.3 RRU and ARETU/RETU

BB000527B

ARETU/RETU

MU

RRU

Branch A

Branch B

Antenna

RBS internal jumper cableRBS jumper cable


RETU cable

Figure 4 Antenna System with an RRU and an ARETU/RETU

This chapter describes RRU without ASC support.

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5.3.1 Supervision

Table 3 Supervision Methods

Supervision type Method Alarm triggered

RRU → ARETU/RETU – CommunicationLostWithRet

RRU → Antenna VSWR(1)

DC resistanceon branch B

AntennaSystemProblemInBranchA (or B)

(1) On branch A, and when supported by the RRU

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5.4 ASC/ATMA and ARETU/RETU

This section describes antenna systems with ASC/ATMA and ARETU/RETUas shown in Figure 5.

Ge1614A

RBS

RU


RBS jumper cable

Antenna feeder cable Branch A

Branch B

ASC/ATMA

Antenna


RETU cable

ARETU/RETU

RRU MU


Feeder jumper cable

Figure 5 Antenna System with an ASC and an ARETU/RETU

Branch A contains communication signals to the ASC and the RETU.

5.4.1 Supervision

This section describes antenna systems supervision with ASC/ATMA andARETU/RETU and possible supervision methods are described in Table 4.



RU/RRU →ASC/ATMA

CommunicationLostWithAscFeederCurrentTooHighBranchA (or B)FeederCurrentTooLowBranchA (orB)(1)

ASC → ARETU/RETU

DC current

RetPortCurrentTooHigh

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RU→ Antenna(2)

ASC → AntennaVSWR AntennaSystemProblem

RU/RRU →ARETU/RETU

– CommunicationLostWithRet

(1) The alarm is controlled by the AntennaBranch::lowCurrentSupervision MO attribute(2) Supervision only when using ATMA

5.5 RIU and ARETU/RETU

This section describes antenna systems with RIU and ARETU/RETU as shownin Figure 6.

RU

Ge1615A


RBS jumper cable

Antenna feeder cableBranch A

Branch B

Antenna

ARETU/RETU

RIU

RIU jumper cable


RETU cable

RRUMU


Figure 6 Antenna System with RIU and RETU

Branch A contains communication signals to the RIU and the RETU.

5.5.1 Supervision

This section describes antenna systems supervision with RIU and RETU andpossible supervision methods are described in Table 5.

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RU/RRU →Antenna

DC resistance(1) AntennaSystemProblem

DC current FeederCurrentTooHighBranchAFeederCurrentTooLowBranchA(2)

RU → RIU-RETU– CommunicationLostWithRet

RU/RRU →Antenna VSWR(3) AntennaSystemProblem

(1) On branch B only(2) The alarm is controlled by the AntennaBranch::lowCurrentSupervision MO attribute(3) When supported by the RRU

5.6 TMA

This section describes antenna systems with TMA as shown in Figure 7.

RBS

RU

Branch A

Branch B


RBS jumper cable


Feeder jumper cable

ASC/TMA jumper cable

TMA

Antenna

RRUMU


Ge1616A

Figure 7 Antenna System with a TMA

An antenna system with a dual branch TMA, supporting both branches. Asingle-branch TMA supports only one branch per TMA. No branch contains anycommunication.

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5.6.1 Supervision

This section describes antenna systems supervision with TMA and possiblesupervision methods are described in Table 6.



RU/RRU → TMA DC currentFeederCurrentTooHighBranchA (or B)FeederCurrentTooLowBranchA (or B)(1)

RU/RRU →Antenna

VSWR(2) AntennaSystemProblem

(1) The alarm is controlled by the AntennaBranch::lowCurrentSupervision MO attribute(2) On branch A when supported by the RRU

5.7 TMA, RIU and ARETU/RETU

This section describes antenna systems with TMA, RIU, and ARETU/RETUas shown in Figure 8.

ARETU/RETU

RU


RBS jumper cable

Antenna feeder cable Branch A

Branch B

RIU

TMA

RIU jumper cable

TMA jumper cable


RETU cable

Ge1617A

RRUMU


Figure 8 Antenna System with TMA, RIU, and RETU

Branch A contains communication signals to the RIU and the RETU.

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5.7.1 Supervision

This section describes antenna systems supervision with TMA, RIU, and RETUand possible supervision methods are described in Table 7.



RU → RIU-TMA DC current LnaFailureBranchA (or B)FeederCurrentTooHighBranchA (orB)FeederCurrentTooLowBranchA (orB) (1)

RU/RRU → Antenna VSWR(2) AntennaSystemProblem

DC current FeederCurrentTooHighBranchARU/RRU →ARETU/RETU – CommunicationLostWithRet

(1) The alarm is controlled by the AntennaBranch::lowCurrentSupervision MO attribute(2) When supported by the RRU

5.8 TMA with External Power Supply

This section describes antenna systems with TMA and external power supplyas shown in Figure 9.

Antenna

TMA

Branch ABranch B


RBS jumper cable


Feeder jumper cable

ASC/TMA jumper cable

TMA powercable

SK0000479B

RU

Figure 9 Antenna System with TMA and with External Power Supply

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No branch contains communication.

5.8.1 Supervision

This section describes antenna systems supervision with TMA and externalpower supply and possible supervision methods are described in Table 8.



RU → TMA – –

RU → Antenna VSWR AntennaSystemProblem

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Supervision Overview

6 Supervision Overview

Table 9 lists the various supervision methods and when they can be used.

Table 9 Antenna System Supervision Overview

Supervision methodsAuxiliary UnitsUsed DC Resistance VSWR on branch A DC Current Alarms from

Supervision ofCommunication

No UnitsRU → Antenna

RRU → Antenna(1)

RU → Antenna

RRU → Antenna(2)- - -

ASC/ATMA -

ASC → Antenna(3)

RU/RRU →Antenna(2)

RU/RRU → ATMA(2)

RU/RRU → ASC ASC RU/RRU →ASC/ATMA

ARETU/RETU(with RRU) RRU → Antenna(1) RRU → Antenna(2) - ARETU/RETU RRU → ARET

U/RETU

ASC andARETU/RETU

-ASC → Antenna(3)

RU → Antenna

RU/RRU →ASC/ATMA

ASC → ARETU/RETU

ARETU/RETU

ASC

RU → ARETU/RETU

RU → ASC/ATMA

RIU andARETU/RETU

RU → Antenna

RRU → Antenna(1)

RU → Antenna

RRU → Antenna(2)RU → RIU-ARE

TU/RETU ARETU/RETU RU → ARETU/RETU

TMA -RU → Antenna

RRU → Antenna(2)

RU → TMA

RRU → TMATMA -

TMA, RIU andARETU/RETU

-RU → Antenna

RRU → Antenna(2)

RU → TMA

RU → ARETU/RETU

TMA RU → ARETU/RETU

TMA w ExternalPower

- RU → Antenna - - -

(1) On branch B(2) when supported by the RRU(3) ASC supervises both branch A and B, but supervises only the antenna branch where there is an active TX signal.

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