Gsm Bss Swap Guide

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Document number

Product

number GSM BSS

Intended for GBSS engineers and GSM RNO engineers

Product version Edited for GSM Product/RNO GEO Document

number

GSM BSS Swap Guide

Prepared by Chen Xinting, Yang Jie,

Fan Kai, and Yi Hongwei Date 2006-03-02

Reviewed by Si Fazhong, etc. Date

Reviewed by Date

Approved by Date

Huawei Technologies, Co., Ltd.

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Revision Record

Data Revision Version Version Description Author

2006-02-22 V1.0 Initial Version Chen Xinting, Yang Jie, Fan Kai, and

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GSM BSS Swap Solution (Template)

Key words: swap, integration, GBSS, network optimization Abstract:

Compared with the swap documents edited before, this document describes the whole swap procedures based on the swap experience of the current GBSS (the version is BSC32). As with this version, the focuses are on the introduction of the specific swap implementation from the perspective of engineering and the differentiation of the engineering scenarios. In addition, this document also provides the tips on how to control network quality and what should be paid attention to (especially the coverage and parameters) during swap. Furthermore, this document gives the risk analysis and related cases for your reference. In a word, this document can help you improve work efficiency, avoid unexpected problems, reduce technical requirement on engineers, and ensure swap quality.

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Preface

What are the characteristics of this document?

 Whole swap procedures are described in this document and the focuses are given to four aspects, including network information collection and evaluation, network optimization, swap implementation, and risk analysis.

 The differentiation of the original network information is available and the information collected according to the forms provided in this document can meet swap requirement.  Engineering scenarios and detailed swap steps are provided.

 Risk analysis and many cases are available.  Delivery according to contract is appreciated.  Control of network swap quality is emphasized.  Swap cases are updated.

How to use this document?

Network swap is a systematic project, so it must be implemented according to steps. More importantly, good planning and network monitoring are necessary.

 This document consists of several chapters, but the actual swap process can be divided into three parts, including network information collection (Chapter 1, 2, and 3), swap implementation (Chapter 4, 5, and 6), and network monitoring and acceptance (Chapter 7 and 8).

 Collecting and evaluating the information of the original network is the most important for a successful swap. Therefore, the earlier to provide technical service and use this document, the better for the network swap. Generally, this document must be used after contract signature but before network swap so that the network information collection and evaluation can be finished as soon as possible.

 The parts for survey, installation and commissioning, and integration preparation are for the implementation engineers’ reference.

 This document can be used as the template of network swap and integration during the implementation of a swap project.

 The parts for RNP and RNO are for the RNO engineers’ reference.  The parts for risk analysis are for project engineers’ reference.

Note:

In this document, the “original network” refers to the network need to be swapped but has not been swapped.

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Chapter 1 Swap Principle and Strategy

At present, the GSM technology is mature than ever before, and so is the market competition. Therefore, GSM network swap, especially the swap of the base station system, will surely become the trend. The GSM network swap is a complex systematic project for the following considerations:

 Multiple operators’ equipments are involved.  The features of the equipments vary with operators.  The network structure will change after swap.

 The quality of the swap implementation must be ensured.

 The cooperation of different operators’ equipments must be available.  The RNP and RNO level is a great concern during network swap.

 The performance of various equipments may be greatly different in the same geographic environment.

As a leading GSM equipment provider in the world, Huawei has swapped multiple operators’ networks and has acculturated rich experience. Hereunder lists several examples and gives a general description of the swap strategies.

1.1 Huawei Network Swap Experience

Huawei GSM system has been widely used in the worldwide. By December 2005, Huawei has swapped 300, 000 TRXs and more than 50,000 BTSs and the equipments of many world-honored operators are involved, including Motorola, Siemens, Ericsson, Nokia, Bell, Alcatel, Nortel, Lucent, etc. Huawei has accumulated rich experience in network swap through these projects, among which the major projects are listed in Table 1.1.

Table 1.1 Major swap projects implemented by Huawei

Country or region Operator Equipment provider of the original network

Swap scale

Philippines Digitel Alcatel 5893TRX

Nigeria MTN Ericsson 4795TRX

Liaoning Province Unicom Lucent 6241TRX

Indonesia Indosat Siemens 4552TRX

Sichuan Province China Mobile Ericsson 4505TRX

Colombia Movil Siemens 1300TRX

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Zhejiang China Unicom Nortel 870TRX

Fujian Province China Mobile Nokia 3000TRX

Inner Mongolia China Mobile Nokia 1065TRX

 Note:

 Actually, multiple network elements, such as MSC, HLR, and GPRS part, are involved in GSM network swap. In this case, you should swap the core network part, and then swap the base station part.

 If network expansion and construction should be performed during the swap, you should swap the network first so that the smooth transition of the network can be ensured.

 The network indicators must be consistent with that specified in the contract for delivery.

1.2 General Swap Principle

The swap of the GBSS is the same as that of other network elements and the following four principles should be followed:

 Security

 Excellent quality and low cost  Smooth transition

 High efficiency

1.3 Swap Implementation Strategy

From the perspective of the effect against the network, the following strategies can be used for GBSS swap.

 Parallel swap  One-time swap

 Batch swap (recommended)  Mixed swap

1.4 Swap Procedure

This document introduces the whole swap procedures, including network information collection and evaluation, equipment installation and commissioning, network swap planning, integration solution design, swap preparation, integration preparation, after-integration test and optimization, and swap acceptance. The key tasks are network information collection and swap implementation. Figure 1.1 shows the whole network swap procedure.

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Netw ork information collection

Analysis and evaluation of the original netw ork

Project survey and design BSC/PCU/BTS/project design file for

M2000/survey report

Goods preparation, shipment, transportation, customs clearance, storage, goods distribution

Hardware installation

Install BSC/PCU/M2000 Install g temporary Install BTS equipment

BTS Transmission adequate or not ? Allocate temporary transmission resource Cabinet installation space adequate or not? Hardw are installation completed

BSC/PCU hardw are check, acceptance, pow er-on test,

hardw are status

BSC/PCU commissioning

Joint debugging w ith BSC

Acceptance test for various functions, services, and BSC/PCU equipment

N

Y

N

Y Start, contract information

Basic information of the original network/ basic need and function/equipment information/RNP data/core network KPI/

transmission networking/power supply configuration/abnormal network information

and customer complaint/customers' engineering and maintenance capability/

acceptance standards

DT test/KPI evaluation/CQT for VIP area/ GPRSCQT and GPRS DT test/external interference test/CW test/simulation/MOS

test/coverage comparison test

Temporary installation space? N Y Y Y N

Netw ork sw ap implementation Connect to core netw ork Hardw are installation completed BTS transmissio qualified or not? N Constructing new antenna BTS off-line test N Constructing new power supply? Y Communicate with customers, make contract and technical

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Netw ork sw ap implementation

Sw ap solution design General network swap solution/design and review for the swap solutions to network elements/integration plan and customer confirmation

Netw ork sw ap planning

Total netw ork planning/after-sw ap acceptance/sw ap RNP data design/planning data review /interconnection

parameter confirmation

Sw ap preparation

Integration coordiination and affairs needing customers' cooperation/analyzing integration difficulties and making emergency measures for integration failure/ personnel arrangement, vehicle arrangement, test tool, installation tool, spare part

preparation and emergent measures/data preparation

Failure processing

Is each network element normal before

integration？

N

BSC A-interface integration

Y

A-interface dialing test table/netw ork element status check/traffic statistics registration

Pre-integration or not? N Y Pre-integration Test passed or not? Failure processing N Transmission confirmation Y

Shut dow n the original BTS

Remove the original BTS

Install new cabinet, pow er-on check the

hardw are

Transmission system integration

Package the orginal cabinet properly

Focus attention on checking TRX transmit pow er

BTS on-line test Focus attention on testing TRX call and service

Antenna and feeder

system integration Focus attention on testing standing-to-w ave ratio

Does BSC run normally? Failure processing N Y Success or not? Changeback of the data of the original

BSC

End N

Y

The transmission at the A/A-sub/Abis/Pb/Gb interfaces need to be confirmed.

BSC integration

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Netw ork quality monitoring and optimization after sw ap

Meet the requirement specified in contract or not?

End N

Y Process equipment

problems online Equipment failure processing/complaintprocessing/alarm analysis

Netw ork evaluation

KPI analysis: voice KPI analysis/packet service KPI analysis/NSS-side indicator analysis/DT

analysis/CQT analysis Netw ork optimization adjustment Sw ap acceptance/documentation handover Integration completed End Success or not? Failure processing Success

or not? N Change back to the_{original BTS} N

Y

Field DT acceptance The test contents include signal strength, Ec/Io,_{interference indicators, and site distance}

Analyze test results and check BTS

running state

Y

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Chapter 2 Network Information Collection and

Evaluation

Engineering capability is the key to the success of a swap project. To improve work efficiency and thoroughly understand customers’ needs, you should collect the related network information beforehand. This chapter introduces the information needed to be collected before swapping a network. You can obtain the data through contract review, customer communication, field test, etc.

2.1 Network Information Collection

The following information of the original network must be collected:  Basic information of the network

 Basic needs and functions

 Basic information on the operation of online equipment  RNP data

 Transmission and networking information  Information of power supply configuration

 Abnormal network information and customers’ complaints  Customers’ engineering and maintenance capability

2.1.1 Basic Information of the Original Network

I. Network Structure of the Original Network

The network structure of the original network should contain the basic information of the main equipments, such as the MSC, BSC (PCU), and the overall BTS layout. If packet service is available in the original network, the information of the packet equipments, such as SGSN and GGSN, should be included. If the core network needs to be swapped, the basic networking information of the HLR and MSC should be included. In addition, the description of the configuration and capacity of the network should also be provided based on the networking diagram. If possible, you can configure the BTS layout created by MAOINFO.

If you have an all-round understanding of the above information, you can know more about the total network and see more clearly the order and difficulty of the swap project.

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Figure 1.1 Schematic drawing of a GSM network

In the urban area of XX city, the operator S has 2 MSCs. MSC1 can accommodate 270,000 users and has 5 BSCs. They are S BSC2, S BSC5, S BSC 6, S BSC 12, and Huawei BSC2, responsible for the covering eastern XX district, XX district, and XX road. MSC2 can accommodate 300,000 users and has 6 BSCs. They are S BSC4, S BSC7, SBSC8, S BSC11, S BSC20 and SBSC4, responsible for covering XX district and XX road.

In the urban area of XXX city, there is 1 Huawei MSC. MSC4 can accommodate 270,000 users and has 6 BSCs. They are S BSC1, S BSC3, S BSC10, Huawei BSC1, Huawei BSC5, and Huawei BSC6, responsible for covering XX district and XX road.

II. Configuration Information of the Original Network

The configuration information of the original network includes equipment configuration information, capacity information, provider information, BSC home information, BTS number under BSC, TRX number, etc. For details, see the following two tables.

Table 1.1 MSC information in XXX city

No.

Equipment Name

Original

Capacity Operator Version BSC Carried

1 MSC1 270,000 S SR9 BSC2, 5, 6, 12, HWBSC12

2 MSC2 300,000 N SR9 BSC4, 7, 8, 11, 20, HWBSC4

3 MSC4 270,000 Huawei G6 BSC1, 3, 10, HWBSC1, 5, 6

4 MSC3 220,000 E R12 BSC9, 13, 14, 18, 19, HWBSC3

Table 1.2 BSC information in XXX city

No. BSC

Name Operator BTS number

TRX

number Coverage area

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1 SBSC12 S 44 197

2 HWBSC2 Huawei 47 317

3 HWBSC4 Huawei 30 220

III. OMC Networking Diagram and Network Management System Information

For the networks large in size and the network elements are distributed in vast areas, the OMC networking is often complex. In this case, multiple routers and switches are needed for communication. Sometimes the original semi-permanent connection equipment or timeslot insertion equipment can be used for the networking. Therefore, you are suggested to collect the OMC networking diagram of the original network. If the original OMC networking is simple and all the equipments are concentrated in a place, you can use simple local area network for TCP/IP communication. But before that, you should understand the composition of the local area network. In a word, it is a must for you to understand the original network management information and the accessibility of the third party’s equipments.

Before swapping a network, you should have an overall understanding of the following contents:  The topology of the network

 The accessibility of the third party’s equipments for alarming and traffic statistics

 The formats and interface standards of the original traffic statistics and alarming data (Generally, TCP/IP is used for data connection and FTP is used for data transmission)  The types of the wide area network, including ISDN, DDN, X.25, frame relay, etc.

 The components of the network, including HUB, exchange, router, ATM exchange, WAN exchange, access server, timeslot integration equipment, etc.

 The performance of the network, especially the indicators about bandwidth and delay. Figure 1.1 shows the OMC networking diagram used in XXX area.

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IV. Traffic Model of the Original Network

The traffic model of the original network should be collected.

Traffic model is the basic data for network capacity planning. Generally, the total network capacity is predicted according to mathematic models. First the traffic model is used to calculate the traffic volume of the system, and then the structure of the PLMN can be used to estimate the traffic volume present of interface, while the traffic volume of each interface can be used to decide the configuration of the voice circuits and signaling links at the interfaces. Finally, the TRX channel configuration of the base station can be decided.

Traffic model will be greatly affected by social environment, economy, and main user groups and will change with the growth of user number. Customers’ RNP departments are responsible for providing the traffic model, so there is no unified standard. At present, the traffic model for voice service is mostly emphasized.

Table 1.1 introduces the traffic model for the voice service of a domestic GSM network. Table 1.1 Traffic model for GSM voice service (a domestic GSM network)

Item Traffic model-1 Traffic model-2

Busy-hour Erlang per subscriber 0.018 0.018

Average call hold time 48 48

Calling mobile subscribers 39 39

Called mobile subscribers 57 57

Calls made by each mobile subscriber at busy

hour 1.35 1.35

Call connected ratio 80% 80%

Mobile subscriber location update at busy hour 1.21 2.61 Secondary page ratio caused by called mobile

subscriber 20% 20%

Handovers for each call made by mobile

subscriber 1 1.7

Short messages send by each mobile subscriber

at busy hour 128 100

Short messages received by each mobile

subscriber at busy hour 384 211

Ratio of mobile subscribers roaming inside to

total mobile subscribers 10% 10%

Ratio of mobile subscribers roaming outside to

total mobile subscribers 10% 10%

Mobile subscriber activation ratio 100% 100%

Traffic distribution

Mobile-Mobile 40% 40%

Fix-Mobile 36% 36%

Mobile-Fix 24% 24%

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Table 1.2 Traffic model for GSM voice service (a foreign GSM network)

Parameters Value Remark

Average Call Hold Time 72s –

Erlang per Subscriber 0.02 –

BHCA 0.5MO+0.5MT – Mmobile to Mobile 60% – Mobile to Other PLMN – – Mobile to PSTN 20% – PSTN to Mobile – – SMS Numbers/BH/SUB(MO) 1 – SMS Numbers/BH/SUB(MT) 1 – Ratio of IN subscribers 95% –

location update numbers/BH/SUB 1.5 –

location update numbers/BH/SUB(to HLR) 0.3 –

Authentication numbers/BH/SUB 0.3 –

Table 1.3 introduces the traffic model for packet data service. Table 1.3 Traffic model for packet data service

Item Value Remark

GOS of circuit service 2% For reference

Busy-hour Erlang per subscriber for circuit service 0.03 For reference

GPRS user penetration rate 50.00%

IP layer bandwidth for each (BYTE/s) 2500

Bandwidth for each GPRS channel (BYTE/s) 2000 Busy-hour bandwidth for each GPRS subscriber (bps) 400

GoS of GPRS service 2%

 Note:

The increase of the SMS will raise the load on the NO.7 signaling link. Therefore, if the SMS takes a larger ratio, the configuration of the NO.7 signaling link should be adjusted accordingly; otherwise the SDCCH and NO.7 signaling link will be congested.

V. Customers’ Charging Setting Information

Generally, you can collect the customers’ charging setting information from their market departments. There information to be collected includes the followings:

 Time for free of charge

Some operators set the time for free call. Generally, in this period of time, the traffic volume will grow rapidly and thus network congestion may be caused.

 Monthly fee policies, including monthly fee for the calls made within the same network, monthly fee for called services, and monthly fee for packet data service.

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2.1.2 Basic Needs and Functions of the Original Network

You should analyze the basic needs and functions of the network according to the technical proposals made in contracts, especially you should check if the needs and functions that have been realized in the original network can be realized by Huawei BSS and if they are supported by Huawei software. If you find any problem, contact the technical supports as quickly as possible. Table 1.1 lists the basic services and functions of the original network.

Table 1.1 Basic services and functions of the original network

Item Content Remark

Voice version FR EFR HR AMR –

Encryption setting No A50 A51 A52 –

Circuited data service Not support 2.4K 4.8K 9.6K –

TFO Support Not support –

Cell broadcast Support Not support Cell name,

advertisement, whether reports

LCS Support Not support –

SDCCH dynamic allocation Support Not support –

Mutual aid between main BCCHs

Support Not support –

MNC digit extension function

Support Not support –

Concentric cell Support Not support –

CO-BCCH Support Not support –

GS interface Support Not support –

Extended cell Support Not support –

GPRS/EDGE Support Not support –

BSC/BTS intra-exchange Support Not support –

Authentication – – –

Paging mechanism LAC paging LAC and CI

paging

Other paging

2G/3G handover Support Not support –

Acoustic Echo Canceller Support Not support

Noise Suppression Support Not support

2.1.3 Basic Equipment Information of the Original Network

I. GSM Protocol Standard Phase Version

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 Note:

To avoid that some functions cannot be realized normally after interconnection, you should check the protocol phase version supported by the original equipment if the original network has been there for a long time. You are suggested to use singling analyzer to collect the messages sent across the A-interface and Abis interface at busy hour and send them to technical supports for verification.

II. Software Version Information

Table 1.1 lists the software version information of some network elements. Table 1.1 Software version information of MSC, BSC, and BTS

No. Equipment Operator Type Software version Remark

1 MSC1 S – SR9 –

2 MSC4 Huawei G6 R003 –

3 BSC2 S – SR9 –

4 BSC1 N – R10 –

5 BTS N ULTRASITE DE21 –

III. BSC Configuration Information

Table 1.1 lists the BSC configuration information Table 1.1 BSC configuration information

BSC Location Operator BTS number TRX number Half rate TRX number EDGE TRX number Coverage area Slave MSC SBSC12 – S 44 197 100 90 Urban area 1 MSC3 HWBSC2 – Huawei 47 317 231 123 Urban area 2 MSC2 HWBSC4 – Huawei 30 220 125 46 Suburban area MSC3

IV. BTS Configuration Information

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Table 1.1 BTS configuration information

BTS Location Operator Type Cell configuratio n TRX number Transmission mode E1 number Slave BSC BFM

K XX city S R11 S222 6 Micro wave 1 MSC3

KPR

I XX island Huawei 3002C O1 1 Satellite 1 MSC2

CBI

O XXX Huawei 312 S3443 14 Optical fibre 2 MSC3

V. TRX Configuration, Combiner Information, Set-top Power

Table 1.1 TRX configuration, combiner information, set-top power BTS

Type Operator

Configurati

on Combiner Type

Combination

Mode Combiner loss

Set-top Power

A9100 A S666 ANC+ANY 4-to-1 8dB 7.1W

BTS30 Huawei S222 CDU 2-to-1 4.5 dB 21.4W

BTS312 Huawei S666 2CDU+SCU Concentric cell Overlay:8dB;

underlay:4.5dB Underlay :21.4W; Overlay: 9.5W  Note:

You are suggested to select the BTSs with typical configuration and perform field verification of the set-top power. In addition, you should check if the partner has installed the lightening protector.

VI. Tower Amplifier Information

If the tower amplifier is configured for the original BTS, you should collect the tower amplifier information, as listed in Table 1.1.

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Table 1.1 Tower amplifier information

Specification Operator Type Frequency band Receiver gain Working voltage Working current Power supply mode – – Triplex 900 12dB 12DC 100-200mA CDU feeder – – Duplex 1800 – – – – – – Simplex – – – – –

VII. Feeder Configuration Principle

The feeders 7/8 and 5/4 are most commonly used. Some operators also use the feeder 18/8. VIII. BTS Grounding Principle and Feeder Grounding Principle

The BTS grounding principle and feeder grounding principle vary with operators. For example, the operators in Indonesia have no requirement on feeder grounding, but the operators in Iran do not allow the feeder to be connected with the tower directly.

IX. Indoor Coverage Distribution System Information

Indoor coverage is used to improve the mobile communication quality for indoor users. The principle of the indoor coverage system is to use the indoor antenna distribution system to evenly distribute the signals from the BTS in an indoor environment. At present, the following solutions are used for indoor coverage.

 Repeater + distribution antenna  Macro cell + distribution antenna  Micro cell + distribution antenna  Mini-micro cell + distribution antenna  Mini-micro cell only

You should pay attention to collect the indoor coverage solution used in the original network. If distribution antenna system is used, you should especially know the feeder configuration principle of the distribution antenna system and check if there is diversity reception.

X. Repeater Information

The repeater is used in vast areas to cover the indoor dead zones and is the coverage extension of the surrounding BTSs. The types of repeaters include wireless frequency selection repeater, optical frequency selection repeater, wireless wide band repeater, and optical wide band repeater. You should have an overall understanding of the repeaters in the original network and pay special attention to the repeater location, transmit power, channel number setting, antenna configuration, etc.

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Table 1.1 Repeater information Provider and specification Type Band or Channel Selective Power Downli nk (Uplink ) Gain /dB Downli nk (Uplink ) Noise Figure /dB Downli nk (Uplink ) Order Intercep t /dBm Downli nk (Uplink ) No. of Channe ls Size /mm AFL GSM 900 Band 1,5,10,20 ,25 W 30,50,80, 95 (30,50,8 0,95) 4.5 (4.5) 40,47,50, 54 (40,47,5 0,54) N/A 460 x 550 x 220 (10W) Allgon AR 120 GSM 900 Channel 24 (20) dBm 40-60 <6 2 230 (W) 285 (H) 120 (D) Mikom MR 340 Channel 32 dBm (2channe l) 28 dBm (4channe l) 85-89 (2channe l) 82-86 (4channe l) 6-8 2 channel modules per cabinet [2] 425 (W) 255 (H) 110 (D)

XI. Movable BTS Information

Movable BTSs are often installed in the cars or in the containers that can be easily moved. The satellite or micro wave is used to transmit the signals for movable BTSs, so movable BTSs are often used in emergent communication situations. You should have an overall understanding of the configuration information of the movable BTSs in the original network and pay special attention to the TRX configuration, transmission mode, and antenna configuration.

2.1.4 RNP Data of the Original Network

I. Proejct Parameters

Hereunder lists the project parameter information

 BTS information: BTS name, BTS number, BTS configuration, equipment specification  Cell information: cell number, longitude, latitude, CGI, BSIC, frequency band, channel

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 Antenna and feeder system: antenna type, antenna gain, polarization mode, half-power angle, electrical tilt, frequency scope, mechanical tilt, antenna height, azimuth, down tilt, feeder length, diversity mode.

 Environment information: city, height above sea level, collocation site, coverage area (urban area or suburban area)

For more information, see RPO201-05 project parameter table (G).

II. Radio Parameters of the Original Network Providers and Special Functions

The radio parameters of the original network providers include cell parameter, system parameter, handover, power control, access parameter, frequency hopping, adjacent cell, etc.

First you should obtain the RNP parameter configuration files used by the original network providers from the customer, and then use the parameter conversion tool to convert these parameters into the ones used by Huawei.

For more information, you can consult technical support engineers and related operation guides. III. Original Network Traffic Statistical Data and KPI Formula

The original traffic statistical files vary with equipment providers, but they can be converted into excel documents by corresponding conversion tools. Therefore, you can obtain such files from customer. For cell-level indicators, the busy-hour data in 7 days should be collected. For total network indicators, you can use the data reported on the customer maintenance day (one month of data is needed).

Generally, the following KPIs will be contained in a contract:  TCH drop rate

 SDCCH drop rate  TCH congestion rate  SDCCH congestion rate  Handover success rate  TCH assignment success rate  Call setup success rate  Call success rate  Paging success rate  Radio quality

These KPIs are obtained from some basic indicators through certain calculations and they reflect the statistical points used by the original equipment provider. You are suggested to collect the remark files of the KPI formulas from customers.

IV. Network Planning Principle

For frequency planning principle, you should understand the frequency resource, frequency reuse pattern, reserved channel numbers, etc.

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For cell naming principle, you should understand the composition of cell name, the matching relationship between cell sequence and azimuth.

For CGI numbering principle, you should understand the matching relationship between the MCC, MNC, LAC and the areas, and the CI numbering scheme as well.

For BSIC naming principle, you should know the optional scope of the BCC and NCC.

For VIP area, such as the coverage hot-spots, capacity hot-spots, and key organizations, you should know the related agreements.

For more information, obtain the related documents from the technical support engineers. V. Channel Configuration

You should know the principles used to configure the CCCH, SDCCH, and PDCH in the original network. In addition, you should also know the usage of half rate and AMR.

VI. MSC and RNP-related Information You should collect the following information:

 MSC paging modes (paging according to LAC or CGI; TMSI paging, IMSI paging, or mixed paging; paging times, paging interval; or total network page)

 Location update time at the network side  Voice support version

 Encryption algorithm selection

 Location update success rata and paging success rate

The settings of T305 and T308 have a great effect on call drop rate.

2.1.5 Core Network KPI of the Original Network

I. MSC KPI of the Original Network

The MSC KPI of the original network should be checked. Generally, you can check the following items:

 Subscriber number ratio and intelligent subscriber ratio of the local VLR  Connective rate between MSCs

 CPU seizure rate  Traffic volume per line  Traffic load per link  Paging success rate  Location update rate

 Inter-MSC handover success rate  Short message sending success rate  Average duration

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II. PS KPI of the Original Network

The PS KPI of the original network should be checked. Generally, you can check the following items:

 ATTACH success rate  PDP activation rate  Packet paging success rate  Attached subscriber number  Average attach time

 Average PDP activation time

III. Maximum Rate for User Subscription

The maximum rate for user subscription is the most important user subscription parameters in HLR. If the peak throughput for the SIM subscription is incorrectly set, the EDGE rate will be slow. Hereunder gives an example.

A user complained that the data service of the PCU MSC9 was unstable and the MSC9 rate ranged from 60 to 70 Kbps (the rate is far slower than the theoretical value) when 3 PDCHs were activated simultaneously. It is found later that the peak throughput was set to only 8000 octets/s (64Kbps) for SIM subscription. Therefore, the peak throughput the user can enjoy is 64Kbps during data transmission. After changing the peak throughput to 64000 Octets/s in the subscription information, engineers found that the average download rate was increased to 150Kb. Thus, this problem was solved.

2.1.6 Transmission Networking Information of the Original Network

I. BTS Transmission Networking Information

You should collect the following BTS transmission networking information:

 The networking modes in common use, including star networking, tree networking, chain networking, ring networking, and mixed networking, in which the chain networking and ring networking should be paid special attention to.

 If the operators are responsible for maintaining the transmission network by their own or they rent other operators’ transmission network.

 If the original transmission network has adequate capacity and if another one transmission line can be added to the original site.

II. E1 Reuse Ratio of the Typically-configured BTS

You should pay attention to the E1 configuration of the BTSs with big configuration and the maximum TRXs that one E1 can support. Generally, the modes include 10:1, 12:1, and 15:1. III. E1 Types

Twisted pair (120 Ω) and coaxial cable (75 Ω) are in common use. For the later one, its connector types include SMB and BNC.

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IV. Microwave Transmission Equipment

If microwave transmission equipments are wilily used in the original network, you should focus attention on checking the bit error and synchronization function of the equipment, the transmission alarm, and the alarm for clock out-of-synchronization.

V. Optical Fiber Information

Check if the optical fiber is directly connected to the BTS. If yes, the type of the optical fiber and the type of the connector should be paid special attention to.

VI. Satellite Transmission Equipment

The information about satellite transmission equipment needs to be collected is listed below:  Specifications and types of the satellite transmission equipment (VSAT or satellite

MODEM)

 Leased according to bandwidth or timeslot  Interfaces supported (Abis, Pb, Gb, A, Asub)

 Stability requirement of transmission (BTS and satellite), average failure time and interruption time per year)

 Circuit accuracy of satellite transmission (bit error rate) VII. HDSL and SDSL Transmission Equipment

With the help of twisted pair and digital modulation, HDSL and SDSL transmission technologies can be used to transmit 2M signals. The disadvantage is that the transmission may be easily interrupted, and thus the BTS cannot necessarily run normally. Considering the cost, some operators will use this transmission mode. When swapping a network, therefore, you should check the stability of the transmission equipment used in the original network.

VIII. Timeslot Consolidation Equipment

The timeslot consolidation equipment can enhance the utilization rate of E1. That is, several BTSs can share 1 E1, or they can also use the E1 of the other network. For a swap project, you should especially check the allocation of the timeslots.

IX. Transmission Compression Equipment

To save transmission cost, some operators will use transmission compression equipment to compress the data flow transmitted through E1. Therefore, to ensure that Huawei equipment can work normally after swap, you need to collect the compression theory, performance restriction, and compatibility of the compression equipment and send the information to the technical support engineers. Whether the equipment is compatible with Huawei BSS should be confirmed as early as possible.

X. BTS Concatention and Transmission Concatention

The information about BTS concatenation and transmission concatenation should be collected, because the information is used to design concatenation data and decide the BTS swap order.

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2.1.7 Power Supply Configuration of the Original Network

Table 1.1 lists the information about the power supply configuration of the original network, and all the information should be collected.

Table 1.1 Information about the power supply configuration of the original network

Item Content Remark

Voltage of AC power supply – 110V, 220V, 110V (double live line) Frequency of AC power

supply – 50HZ, 60HZ

AC phase – 3-phase, single-phase

Type of AC socket – English system, European system, American system

Mains supply –

If the power supply always breaks, the battery discharge will frequently occur. In this case, the life expectancy of the battery will be shortened and the BTS will be out of service.

Diesel configuration – The power is twice that of the load, in the unit of KW.

Working hours of the diesel – In the unit of hour, depending on the fuel configuration.

Capacity of AC power

distribution box – In the unit of KW.

Voltage of DC power – +24V.-48V

Capacity of rectifier – In the unit of KW

Capacity of battery – In the unit of Ah

Feeding duration of battery – In the unit of hour, depending on battery capacity.

Colour of power cable –

Pay attention to customers’ special requirements, especially the grounding cable.

Diameter of power cable – Pay attention to the diameters of the DC power cables of BSC and BTS equipment. Lightning requirement on

power supply – Often 50KA

Lightning requirement on

transmission – Often 5KA

Grounding requirement – Joint grounding; BTS < 5Ω; exchange room < 1Ω

Whether to use solar energy

for power supply –

Pay attention to the solar radiation, the total power supply of battery array, and the capacity of the battery.

UPS configuration –

Pay attention to the capacity of UPR (in the unit of KVA).

Types: in and out; three-in and one-out; three-in and three-out.

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Inverter configuration – Pay attention to the rated power Power supply mode of

outdoor BTS – Mains, diesel, and solar energy

2.1.8 Abnormal Network Information and Customer Complaints

I. Network Failures and Alarming Information

The following failures and alarms should be paid special attention to:  A-interface/Abs interface transmission alarm

 BTS power supply alarm  No.7 signaling break alarm II. Customer Complaints

The complaints made by the customers in the latest month should be recorded and categorized; especially the problems concerning the coverage in hot areas and the problems that are mostly complained by customers should be checked. Generally, the following aspects deserve your attention:

 The signals received by MS are weak and fluctuate greatly.  The subscriber is not in the service area.

 The voice quality is poor. There are noise and one-way audio.  Call drop occurs easily.

 The complaints about service failures, such as one-way audio, cross talking, call drop, incoming call failure, outgoing call failure, are made frequently.

 There are complaints about PS service.

2.1.9 Customers’ Engineering and Maintenance Capability

The following capabilities should be paid attention to, because they are references for the design of network integration solutions.

 Capability to adjust the transmission ports  Capability to adjust the core network data  Capability to adjust BSS network data  Capability to maintain BSS network

 Capability to implement projects and maintain organizational structure

2.1.10 Acceptance Information

The acceptance should be performed according to contract. If there are vague descriptions or the committed indicators are abnormally high in the contract, you need to communicate with the customer for the confirmation of the acceptance mode and procedures in advance. The agreement

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on acceptance time, place, personnel, standard, cases, documentation, and equipment should be reached with the customer.

2.2 Analysis and Evaluation of the Original Network

2.2.1 DT Evaluation

I. Principle

The DT deserves special attention, because the DT results can be used to understand the operation of the network and decide the DT line after the swap of the network. In addition, the DT results of the original network can work as comparative references for the swap. The roads covered by the major lobes of the cells should be chosen as DT lines and the DT lines should cover all the cells of the network. Note that the test should be performed at the busy hours during daytime.

II. Area DT

The area DT aims to obtain the coverage signal level, conversation quality, handover, and call drop in the swap areas. In addition, the BTS distribution and coverage weakness of the original network should be obtained through area DT.

III. DT for Main Roads and VIP Areas

The main roads and VIP areas should be specially tested, especially the handovers occurred on main roads should be tested, because the test results will be the references for coverage comparison and network optimization after swap.

IV. DT Data Analysis

The DT data should be carefully analyzed. For example, you should verify the longitude and latitude of the BTS, the direction of antenna, and the cell parameters. In addition, you should also check if the antenna feeder is inversely connected and if there is cross coverage. Also the reasons for call drop and abnormal handover should be analyzed.

V. DT for Indoor Distribution System

If the Bess to be swapped are connected to an indoor distribution system, you need to use the corresponding software that supports indoor test. Generally, you should get the permission for entrance before the indoor coverage test. It is better to obtain the plan view of the building beforehand.

All parts of the building, including upper floors, middle floors, and lower floors, should be tested. Wrap test should be applied to corridor, meeting room, and offices during pace test. Note that the outer walls of offices and the areas near windows should be tested.

The test items include signal level, conversation quality, cell reselection at the entrance and exit, and handover.

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A test analysis report is required after the completion of whole test.

In addition, you can also obtain the related references from the technical support engineers.

2.2.2 Network KPI Evaluation

I. Difference of KPI Formulas

The KPI formulas used by Huawei are different from that used by the original network equipment provider in some aspects. At present, each equipment provider has the ability to design the traffic statistics and KPI formulas according to customer need, so the statistical points of other providers’ Kips may be different from that of Huawei Kips. Therefore, a full understanding of the original network (especially the KPI formulas and actual indicators) is quite necessary.

Take the replies made by various equipment providers in an operator’s GSM statistical system for example; the calculation results of each provider are almost the same. For details, seek help from the technical support engineers.

You are recommended to measure the paging success rate at MSC side and that measured at the BSS side should work as a reference only. Before selecting the corresponding Huawei statistical indicators, you should analyze the actual statistical scope of the Kips of the original network based on the evaluation of the definition of the statistical points used by the original network equipment provider. If no corresponding indicator is found, you need to communicate with the customer for other ones according to the interests of Huawei.

II. Evaluation Principle

The traffic statistics exported by the original network should be used for evaluation. The evaluation aims to verify if the indicators provided by the customer are real. And the evaluation results are used as a comparative reference after swap. You can use the customer’s network maintenance report. If necessary, you can use related test analyzer for the evaluation.

III. Evaluation of Indicators about Voice, Signaling, and Capacity

The traffic volume, SDCCH congestion rate, TCH congestion rate, paging times during busy hours, and call setup success rate should be evaluated for the understanding of the traffic distribution of the network. You should pay special attention to the signaling flow at the edges of location areas. And the pages made during busy hours also deserve your attention.

IV. Evaluation of Quality Indicators

The quality indicators, including call drop, handover, immediate assignment, interference, RQ, etc, should be evaluated. You need to find out the Bess that have great effect against the total network indicators and the areas where the network quality is quite poor.

V. NSS-related Indicators

The indicators related to NSS, including one-time paging success rate, location update success rate, A-interface signaling load, and inter-MSC module handover success rate should be analyzed, because these indicators may affect the radio network.

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2.2.3 Other Evaluations

I. CQT for VIP Areas

CQT is the best method to check if the network quality is good or bad. It includes indoor COT and outdoor CQT. The spots for CQT are co-decided by the customer and Huawei RNO engineers. According to principle, it is better to choose important organizations, buildings, and prosperous areas as the test spots. Note that the spots chosen for the test should be consistent and the test instruments must be the same before and after the swap, otherwise the coverage quality cannot be effectively compared after the swap.

Table 1.1 lists the main CQT items Table 1.1 Main CQT items

Item name Test value Remark

Seized channel number Average signal strength LAC+CI

Call times

Call connected times Call drop times Voice break times Background noise One-way audio times Echo times

Cross talking times

You can perform CQT by using MS for spot dialing test. Through analyzing the CQT results, you can see the network change.

II. GPRS Evaluation

GPRS evaluation includes CQT evaluation, DT evaluation, and traffic statistics evaluation. GPRS CQT evaluation is used to reflect the network access ability, transmission delay, transmission rate, and service implementation. The test methods include attach test, WAP browse, Ping test, FTP test, WWW browse, etc. The test indicators include power, activation time, average delay, throughput, rate, etc.

GPRS DT evaluation is similar to GPRS CQT evaluation. Besides the indicators tested according to GPRS CQT, the GPRS DT test indicators include location update, cell reselection, coverage, call drop, etc.

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For the related references, seek help from technical support engineers. III. External Interference Test

The external interference sources include TV station, big-power station, micro wave, radar, high voltage cable, analog BTS, CDMA network, meeting secrecy equipment, interference unit of gas station, etc. The interference from some sources is present at certain time. Generally, you can find out the interference through connecting the spectrum analyzer to the antenna.

The Omni-directional antenna is beneficial for interference measurement. If you intend to locate the interference, you should use directional antenna. The commonly used directional antennas include plane antenna, 8-shaped antenna, and digital periodical antenna.

The commonly used spectrum analyzers include HP85XX series and YBT250. The low-noise amplifier can be used to enhance the receiving sensibility of the test analyzer. For YBT250, the low-noise amplifier is installed in it.

If the customer requires external inference test, you can refer to the related guides about interference problem handling.

IV. CW Test

To obtain the radio propagation model fitting the local environment, enhance the accuracy of coverage prediction, and make a good preparation for network planning, some customers require the propagation model to be adjusted. CW test stands for continuous wave test and is an important step for propagation model adjustment. The brief steps of CW test are as follows:

1) Select a suitable site to establish the test platform. 2) Install signal source and antenna.

3) Perform DT using the corresponding software.

4) Process and analyze the DT data through corresponding software For details, see the related guides about continuous wave test.

V. Simulation

Some customers require coverage and quality simulation before and after the swap of the network and have certain requirements on DT data and simulation results. Generally, they require the schematic drawings of the coverage and C/I. Simulation software and 3-D digital maps are needed for simulation. And the adjusted propagation model is recommended. If the propagation has not been adjusted, you can use the ones provided by the customer. At present, Huawei uses ASSET and U-NET for simulation.

VI. MOS Test

At present, the QoS of voice quality is evaluated subjectively, and the MOS (mean opinion score) is the most widely used. However, many objective measures have been used, and the basic ideas are similar. That is, different measurement technologies are used to simulate people’s auditory and

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the equivalent MOS value is provided accordingly. Currently, the PESQ is a mature standard. Figure 1.1 shows the process.

Figure 1.1 Processing performed in PESQ

As far as the PESQ is concerned, first the input signals and the signals that have been processed by the system are sent to the test instrument or related software for further processing, and the test instrument or the software will give the MOS classes.

The value of PESQ ranges from -0.5 to 4.5. The greater the value is, the better the quality is. Generally, the value ranges from 1 to 4.5. For the matching relationship between the MOS score and voice quality, see Table 1.1.

Table 1.1 Matching relationship between MOS score and voice quality

MOS score Voice quality

5 Excellent

4 Good

3 Fair

2 Poor

1 Bad

At present, many test instruments support MOS test. In many cities, the MOS test is a must now. Therefore, you should check the contract carefully to see if the MOS test is required and if the test instrument supports Huawei product.

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2.2.4 Confirmation of the Acceptance Indicators after Network Swap

I. Coverage Comparison

If the customer requires coverage comparison test in the contract, you should pay attention to the following points:

 Understanding the customer’s real intention.

 Understanding the test environment and the coverage of the original network.  Designing the solutions to the interest of Huawei.

 Protecting malicious interference.

For details, see the related operation guides about GSM BTS coverage. II. Statement of Compliance

You should check the RNP&RNO parts for which Huawei is responsible. If there is any vague point, communicate with the customer for clarification.

III. KPI Formulas and Other Test Methods

You should communicate with the customer for the confirmation of each KPI and traffic statistical point. In addition, the test methods, such as DT, CQT, and the related test instruments must also be confirmed. Note that you should better guide the customer to use the methods and instruments recommended by Huawei.

IV. KPI Commitment Evaluation and Guidance

You should evaluate the network after swap reasonably according to the information of the original network. If you find that the customer’s requirements on some indicators cannot be met, you should send the information to the project teams and the staff concerned as early as possible. In this case, all the departments or engineers concerned should take measures to make sure the pass of the acceptance test.

Chapter 3 Project Survey, Equipment Installation and

Test

This chapter describes the project survey and design, equipment installation and test. The engineering duration for this part is the longest and this part is quite important for the success of the network integration.

3.1 Survey and Design

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3.1.1 Survey of BSC/PCU Room

You can survey the BSC/PCU room according to the related survey guide. The key points are listed in Table 1.1.

Table 1.1 Key points for BSC/PCU room survey

Item Sub-item Result Remark

Conditions of equipment room Installation position of cabinet

The distance between the face of one cabinet and the face of the opposite cabinet must be equal to or larger than 1.5m. The distance between the sides of the cabinet and the wall must be equal to or greater than 0.8m. The distance between the commissioning side and the wall must be equal to or greater than 1m.

Load-bearing capability

The load-bearing capability of the equipment room must be greater than 50kg/m2_.

The weight of the PCU is 183kg.

The weight of a BSC with full configuration is 280kg.

The weight of the front door and back door is 45kg.

The weight of the two side doors is 42kg. Temperature and

humidity

The suitable temperature ranges from 15℃ to 30℃. The relative humidity ranges from 40% to 75%.

Net height

The net height of the equipment room is the distance between the installation plane and the girder or the ventilation pipe. Generally, the net height should be greater than 3m. When downward cable is used, the net height cannot be smaller than 2.7m.

Size The equipment room should be 2m or more in height and 1m or more in width.

Power supply

Capacity of the rectifier

Generally, power suppliers with high-frequency switch are required and they should be “N+1” backup. Each module of the power supplier must be installed with current equalization output device.

The total power consumption of a single PCU must be smaller than 1200W.

The maximum power consumption of a full-configuration BM is 350W.

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full-configuration AM/CM is 500W.

DC power

distribution box

You should check if the installation position is suitable and if the wiring terminal configured by Huawei is normally configured.

Battery capacity Does the battery capacity meet the design requirement?

Colour of power cable

Does the customer have special requirement? Some customers require that the grounding cable should be red.

Diameter of power cable

At present, three specifications are available in Huawei. They are 240, 120, and 95 mm^2. You should check if the diameter of the power cable meets the requirement.

Layout of power cable

If the power cable delivered can be installed on the cable rack normally? And if the cable rack is fixedly stand? Transmission Impedance of trunk 75Ω; 120Ω. Types of connectors used for the trunks (75Ω) at the DDF side BNC, SMB, L9 Diameter of trunks (120Ω) at the DDF side

Generally, it is 0.4MM. If the customer has special requirement, the specification of 0.5MM can also be used.

Lightning protection

External alarm The BSC supports external alarm, but the PCU does not support external alarm.

Outdoor cable lightning

protection.

You should check if there is outdoor transmission cable or power supply cable. If yes, check if the lightning protection measures meet the requirement. Others Responsibility matrix for hardware installation;

You need to confirm the responsibility matrix of the installation of transmission equipment and power supplier.

Clock

Clock extraction modes (BITS, MCS, or others)

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3.1.2 BTS Survey

Table 1.1 lists the key points for BTS survey Table 1.1 Key points for BTS survey

Item Sub-item Result Remark

Conditions of equipment room

Location of the equipment room

If there is special procedures for entry; If there is restrictions for night entry;

If special tools such as the ladder are needed for entry;

If the transportation of the equipment is convenient; If installation conditions are needed for advanced installation.

Load-bearing capability

The load-bearing capability of the equipment room should be greater than 400kg/m2. _{Since battery free of}

maintenance should be installed in the equipment and if the specification of the battery is 500Ah or lower, the load-bearing capability of the equipment room must be greater than 450kg/m2. _{If the}

specification of the battery is 800Ah or higher, the load-bearing capability must be greater than 600kg/m2.

Communication method used at the equipment room

You should check if the equipment room can receive the signals from other networks and if there is available fixed phone.

Temperature and humidity

You should check if the environment of the equipment room can support long-time operation of the equipment and if the air conditioner installed for the equipment room can work normally. Generally, if temperature in the equipment room can ranges from 15℃ to 30℃, and the relative humidity can ranges from 40% to 65%.

Net height The net height of the equipment room should be equal to or greater than 2.7m.

Size of the door of the equipment room

It should be 2m or more in height and 1m or more in width.

Installation position

For the convenience of maintenance, you should leave a distance between the BTS and the wall. Installation

conditions of outdoor BTS

The load-bearing capability, transmission condition, installation position of the mount set, and grounding system should meet requirement.

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supply

distribution box meet the requirement of Huawei BTS?

Capacity of the rectifier

Generally, power suppliers with high-frequency switch are required and they should be “N+1” backup. Each module of the power supplier must be installed with current equalization output device. If the power supply voltage is -48V and +24V, the charge current of the battery should be additionally considered (according to 12 TRXs, 2800W). If the power supply voltage is 220V, you need to check if the DC power supply cable is installed at the proper position and the wiring terminal is normally installed (according to 12 TRXs, 3200W, including the charge current of the battery).

DC power

distribution box

You should check if the installation position is suitable and if the wiring terminal configured by Huawei is normally configured.

Battery capacity Does the battery capacity meet the design requirement?

Colour of power cable

Does the customer have special requirement? Some customers require that the grounding cable should be red.

Power supply of transmission equipment

If the power supply equipment cannot be reused, you should check if the power supply cable of the transmission equipment of the original network is long enough to be connected to Huawei equipment and if the diameter of the cable is suitable?

Transmission Impedance of

trunk 75Ω; 120Ω.

Types of

connectors used for the trunks (75Ω) at the DDF side BNC, SMB, L9 Diameter of trunks (120Ω) at the DDF side

Generally, it is 0.4MM. If the customer has special requirement, the specification of 0.5MM can also be used.

Timeslots allocated for E1 at the Abis interface

Monitor the equipment timeslot occupancy, the timeslots of the related integration equipment, and timeslots used for G/C transmission.

Transmission line and the label

for DDF

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transmission port Transmission concatenation relationship

It will affect the swap order.

Lightning protection and grounding system Outdoor lightning protection cable

Check if there is outdoor lightning protection cable for the transmission line and power cable. If yes, check if the lightning protection measures meet the requirement.

Grounding system

Check if the grounding cable is present, if there is adequate room for the grounding bar, and if the grounding terminal can be normally connected.

Antenna feeder lightning

protector

Check the installation position, frequency band, types of the connectors used for the antenna and related equipment, and the standing wave ratio. The problems concerning connectors are main factors affecting the swap progress, so the survey engineers should check them carefully in advance.

Feeder grounding rule

Check if the grounding point can be connected to the feeder grounding clip.

Antenna

feeder Diversity

distance between antennas

The distance of the 900M antennas should be equal to or greater than 4m, and the distance between the 1800M antennas should be equal to or greater than 2m.

Project

parameters Antenna azimuth and tilt angel.

Feeder layout

Check if the connection of the feeder and antenna is correct. Use test MS to check if the cell configuration is correct and if the feeder label is correct and complete.

Tower amplifier

Check the installation position, working band, power supply mode, and alarming mode of the tower amplifier.

Feeder window and thru-wall plane

If other antennas need to be added, you should check if there is adequate room available in the feeder window.

Filter and

combiner of common antenna

If an antenna is shared by other equipment, you need to check if the filter and combiner meet the requirement?

Feeder connector in the equipment room

If the antenna feeder of the network to be swapped can be reused, you need to know the specifications and quality of other equipment providers’ antenna feeders and check if they can match Huawei equipment.

Gsm Bss Swap Guide

GSM BSS Swap Guide

Huawei Technologies, Co., Ltd.

Revision Record

Table of Contents

GSM BSS Swap Solution (Template)

Preface

What are the characteristics of this document?

How to use this document?

Note:

Chapter 1 Swap Principle and Strategy

1.1 Huawei Network Swap Experience

1.2 General Swap Principle

1.3 Swap Implementation Strategy

1.4 Swap Procedure

Chapter 2 Network Information Collection and

Evaluation

2.1 Network Information Collection

2.1.1 Basic Information of the Original Network

2.1.2 Basic Needs and Functions of the Original Network

2.1.3 Basic Equipment Information of the Original Network

2.1.4 RNP Data of the Original Network

2.1.5 Core Network KPI of the Original Network

2.1.6 Transmission Networking Information of the Original Network

2.1.7 Power Supply Configuration of the Original Network

2.1.8 Abnormal Network Information and Customer Complaints

2.1.9 Customers’ Engineering and Maintenance Capability

2.1.10 Acceptance Information

2.2 Analysis and Evaluation of the Original Network

2.2.1 DT Evaluation

2.2.2 Network KPI Evaluation

2.2.3 Other Evaluations

2.2.4 Confirmation of the Acceptance Indicators after Network Swap

Chapter 3 Project Survey, Equipment Installation and

Test

3.1 Survey and Design

3.1.1 Survey of BSC/PCU Room

3.1.2 BTS Survey