Introduction to the RAN14.0 Feature–Multi-Sector Solution

8/10/2019 Introduction to the RAN14.0 FeatureMulti-Sector Solution

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

INTERNAL

Introduction to theRAN14.0 Feature

Multi-Sector Solution

Wireless Product Rollout Department


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Copyright 2010 Huawei Technologies Co., Ltd. All rights reserved. Page2

About This Training

This course is based on RAN14.0.


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Training Objects

After this training, you are supposed to:

Understand the value and application scenario of the multi-

sector solution.

Understand the specifications of the solution.

Explain basic principles of the solution.

Be able to activate and verify the solution according to the

manual.


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Contents


1 Solution Introduction

2 Solution Planning

3 Solution Deployment

4 Solution Optimization

5 O&M and Troubleshooting

6 References Terms


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Copyright 2010 Huawei Technologies Co., Ltd. All rights reserved. Page 5

DefinitionMulti-sector solution: It uses the sector splitting technology to select a proper split antenna or

narrow beam antenna for reengineering a traditional three-sector network into a network

consisting of four, five, six, or even higher order sectors. This solution provides operators

with considerable gain in air interface capacity.

Notes:

For the sake of convenience, this document assumes that a multi-sector network adoptssix sectors.

Two types of six sectors are available: general six sectors and split six sectors. General

six sectors are obtained by using a 33-degree narrow beam antenna to split a sector,

and split six sectors are obtained by using a split antenna to split a sector.

3 Sectors 6 Sectors


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Copyright 2010 Huawei Technologies Co., Ltd. All rights reserved. Page 6

FunctionsHuawei's multi-sector solution adopts the sector splitting technology for network expansion.

When air interface resources such as code resources and power resources are limited, themulti-sector solution can increase the capacity of single sites and areas if network key

performance indicators (KPIs), complexity of engineering, network planning and network

optimization, and cost are controlled . Therefore, the multi-sector solution becomes an

important means for solving the network capacity bottleneck.

In addition to scenarios with a requirement for air interface capacity , the multi-sector solutioncan also be used in the following scenarios:

Frequency resources are limited and expansion cannot be implemented by adding carriers.

No proper site can be deployed to cover hot spots. It is difficult to acquire the site, the period of

expansion by adding sites is long, or the cost is high.

For a legacy network with large sites or sites distantly distributed, the multi-sector solution

can increase both capacity and coverage . For new and swapped networks, the multi-sector

solution can increase the coverage by 30% to 40% or decrease the number of sites by 25%,

and therefore decreases comprehensive network costs.


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Main Technical PointsScenario selection

Antenna selection

Radio frequency (RF) module selection

NodeB selection and baseband board expansion

Site engineering

Network planning and optimization

Note: This document just describes the summary and important information about thepreceding technical points. For details, see the RAN14.0 Multi-Sector Technical WhitePaper , RAN14.0 Multi-Sector Deployment Guide , RAN14.0 Multi-Sector RNP & RNOGuide , and RAN14.0 Multi-Sector Network Impact Report .


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OMStar (Evaluation report)

(Secondary platform) (CHR browse)

(Data collection)

Deployment Scenario

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The multi-sector solution applies to almost all scenarios with a capacity or coverage expansion requirement.

Only few scenarios do not support sector splitting or sector splitting using split antennas, for example, certain regionsin HongKong.

When the antenna is wall mounted or the antenna is installed against a high building (that is, only twosectors are available), it is likely that only the common narrow beam antenna can be used for sectorsplitting.

When horizontal power splitting is adopted to keep away the buildings with the indoor distribution systemfrom left to right for covering two streets or vertical power splitting is adopted to provide indoor coverageand street coverage, multiple sectors are not supported because interference cannot be controlled aftersector splitting.

Note: Deploy SmallCells if it is forecasted that 50% to 70% capacity gain in the case of multiple sectorscannot meet capacity requirements in a region within a short time and there are capacity expansionrequirements in edge regions or there are coverage holes to be covered.

During deployment, the result of resource capacity evaluation can be analyzed by using the Mainex. Collect data fromthe M2000 and use the OMStar to obtain the network evaluation report.

Capaci tybalancing

Expans ion


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Antenna Selection

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In the multi-sector solution, you can select the following common antennas based on

performance, cost, and installation dimensions: split antenna, dual-beam integrated

antenna, and 33-degree antenna.

At present, Andrew's split antenna is recommended by default in this solution. In

certain scenarios, you can select high-performance 33-degree antennas. For details,

see the RAN14.0 Multi-Sector Technical White Paper .

A high-performance antenna can minimize the interference introduced by the multi-

sector solution, and therefore meets the network planning and optimization complexity

requirements and performance optimization requirements.


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RF Module Selection

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New deployment

In principle, the multi-sector solution applies to all RF modules that support the universal mobile

telecommunications system (UMTS). In actual projects, select the proper RF module based on the module

type of the existing site and the customer requirements for the multi-sector carrier, bandwidth, power, and

frequency band.

Expansion of existing sites

In principle, the RF module type must be the same in various sectors . In general, the module type configuredfor the existing three-sector network is adopted by default unless the modules of the NodeB on the existing

three-sector network are replaced with new modules. For example, the existing radio frequency unit (RFU) is

retained for macro NodeBs and the existing remote radio unit (RRU) is retained for distributed NodeBs.

Notes

For RF modules that are backward compatible, the existing three sectors continue to use the modules of

the original model and the new sectors adopt the modules of the new model when multi-sector expansion

is performed on existing sites.

For existing sites, if the existing NodeB is a macro NodeB, the macro+distributed multi-sector networking

mode is allowed to facilitate multi-sector expansion. That is, the RRU is adopted for new sectors.


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NodeB Selection and Baseband Board Expansion

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NodeB

Due to specifications and evolution limitations, it is recommended that 3900 series NodeBs are used to replace the existing BTS3812Es, BTS3812AEs, and DBS3800s to support

multiple sectors.

Baseband board

For NodeBs on which sector splitting is performed, perform analysis and evaluation based onthe traffic measurement, traffic model forecast, number of cells after expansion, credit

resource (CE) consumption, number of users, and signaling processing capabilities of the livenetwork. In addition, determine the final baseband board expansion scheme for the NodeBbased on the board configuration of the live network and the radio access network (RAN)version. That is, determine the baseband board expansion scheme ( baseband unit (BBU)-based baseband board expansion, site division, or BBU interconnection ) and the boardconfiguration scheme .

For a small network adopting multiple sectors, one BBU can meet the requirements.If the baseband specification cannot meet project requirements when one BBU in full configuration isconfigured in existing sites, divide the site or adopt BBU interconnection. In RAN14.0, BBUinterconnection can be adopted to support the super NodeB configuration (6 sectors x 8 carriers x 2antennas per site). For details, see the RAN14.0 Multi-Sector Technical White Paper .


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Site Engineering

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Site survey involves the new deployment of six-sector sites and the expansion to six-

sector sites.Six-sector site survey in new deployment scenarios is similar to common three-sector sitesurvey except that the RF module and antenna support six sectors from three sectors. Duringsurvey, determine the following items in the six-sector site:

Installation space of the cabinet, baseband board, and RF module

Power supply

Installation position and length of feeders in the six sectors

Installation position of antennas in the six sectors (three dual-beam split antennas or six commonnarrow-lobe single-beam antennas)

Installation position

For the detailed survey procedure and method, see the survey specification on three-sector

macro NodeBs.Based on baseband board expansion, the expansion to six-sector sites is further classifiedinto expansion by dividing the site, expansion by adding baseband boards, and expansionwithout adding baseband boards. Site survey involves preparations, on-site survey, andoutput.

In site engineering, pay attention to the minimum service interruption delay. Fordetails about the " 0 DownTime " scheme, see the following descriptions.


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Essentially, the network planning and optimization procedure is the same formultiple sectors and traditional three sectors.

Key and difficult points of network planning and optimization for multiple sectors:Planning and optimization of neighboring cells: In RAN13.0 and earlier versions, the number ofneighboring cells may be insufficient, and therefore it is difficult to plan and optimizeneighboring cells. RAN 14.0 supports the 63 neighboring cells feature, which is not verified atpresent, and it is estimated that this feature can ensure sufficient neighboring cells.

RF optimization: key to interference control

Informationcollection

Six-sector network planning

Six-sector cell planning

Area planning Neighboring cellplanningScrambling

code planningParameterplanning

Six-sector network commissioningand optimization

Neighboringcell optimization

RFoptimization

Parameteroptimization

VIP userassurance

Six-sector network planning andoptimization report

Network Planning and Optimization

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Related Features

Required features

None

Mutually exclusive features

Based on the decision of the product line, the "multi-sector + 4

Rx" scheme is not recommended in RAN14.0 .

Affected features

None

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Impacts

Impact on equipmentIt is required to replace antennas and add RF modules and baseband boards. For details,

see "Solution Deployment".

Impact on resource consumption

More and more CEs and Iub interfaces are consumed when the system capacity increases

after this solution is deployed.

Impact on networking

The network topology changes.

Impact on network KPIs

Theoretically, the main network KPIs such as accessibility, retainability, and mobility are

slightly worsened because the self interference of the system becomes stronger. In fact,

however, only the call drop rate slightly decreases based on the results of Beta tests.

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Application Scenario and Solution Gain

For application scenarios, see "Deployment Scenario".

The coverage gain of this solution is as follows:Comparison of coverage emulation between dense urban (DU) areas and urban (U) areas

Compared with three sectors, the average RSCPof general and split six sectors increases by 2 to3 dB.

In DU areas, compared with three sectors, theaverage Ec/Io of general and split six sectorsdecreases by 1.4 dB and 0.8 dB respectively.

RSCP Comparison of 3-sector vs. 6-sector

0102030405060708090100

-120-110-100-90-80-70-60-50-40RSCP (dBm)

C D F

(

% )

3-sectorGeneral 6-sectorSplit 6-sector

EcIo Comparison of 3-sector vs. 6-sector

0102030405060708090100

-20-18-16-14-12-10-8EcIo (dB)

C D F

(

% )

3-sectorSplit 6-sectorGeneral 6-sector

EcIo Comparison of 3-sector vs. 6-sector

010

2030405060708090100

-20-18-16-14-12-10-8EcIo (dB)

C D F

(

% )

3-sectorSplit 6-sectorGeneral 6-sector

DU DU

U

The ne twork capac ityinc reases by 19% to 49%.

RSCP Comparison of 3-sector vs. 6-sector

0102030405060708090100

-120-110-100-90-80-70-60-50-40RSCP (dBm)

C D F

(

% )

3-sectorGeneral 6-sectorSplit 6-sector

U

RSCP is short for received signal code power.


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Application Scenarios and Solution Gain (Continued)The capacity gain of this solution is as follows:

Comparison of capacity emulation between DU areas and U areas

With better-performance split antennas, inter-cell interference control of split six sectors is better thanthat of general six sectors. Therefore, split six sectors have higher capacity gain than general sixsectors.

DU area:Gain of general six sectors compared with threesectors: 19%Gain of split six sectors compared with three sectors:49%

U areas:Gain of general six sectors compared with three sectors:39%Gain of general six sectors compared with three sectors:72%


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Contents



2 Solution Planning




6 References and Terms


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When to Use the Multi-Sector Solution andInformation to Be Collected

For the application scenarios of the multi-sector solution,see "Application Scenario".

In addition to the information required for expansion

evaluation, collect the following information:Operators' market strategies and network evolution information

Operators' capacity increase expectations and expansion

tendency

Operators' capacity expansion bottlenecks (including the

frequency, site, transmission, and investment)

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Solution Activation Planning Version/LicensePlanning

Matching versionsIn principle, this solution is not recommended for old sites, independent

of the versions of the M2000, configure management express (CME),

base station controller (BSC), and BTS.

License control

None

Mutually exclusive features

The "multi-sector + 4 Rx" scheme is not recommended in RAN14.0.

Required features

None


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This solution does not affect the networking and still adopts the networking mode of the original

macro network.

Essentially, RF planning is the same for multiple sectors and common three sectors. That is,

use the U-net to simulate the coverage to obtain the optimal coverage level (indicated by the

RSCP), optimal coverage quality (indicated by Ec/Io), and minimum interference (indicated by

pilot pollution). In addition, the measurement report (MR)-based engineering parameter design

tool for reengineering from three sectors to six sectors is developed for multiple sectors. For

details, see the RAN14.0 Multi-Sector RNP & RNO Guide .

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Network Planning Networking Planningand RF Planning

FTP Server

GGSN SGSN

HLR RNC

MSC UMG

BBU 3/6 sector


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Network Planning Hardware Planning

This solution aims to meet capacity requirements.Therefore, in addition to adding or replacing RF modules,

baseband boards need to be added in most cases. For

details, see the RAN14.0 Multi-Sector Technical White

Paper .


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Network Planning Acceptance Planning

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The normal acceptance mode in this solution is the same as that for

traditional three sectors, for example:

Engineering acceptance

Network KPI acceptance

In terms of acceptance, the multi-sector solution is different from

traditional three sectors in the following aspects:

Do not actively recommend performance acceptance for operators. If there

are acceptance requirements for DT and statistics KPIs, perform

acceptance based on the contract. The acceptance method and tool are

the same as those for three sectors.

If operators require gain acceptance, perform acceptance based on the

method recommended by Huawei. For details, see the DT and statistics

methods defined in the RAN14.0 Multi-Sector Network Impact Report .


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Contents



2 Solution Planning





D l G l Fl h


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Deployment General Flowchart

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Start

Traffic measurementanalysis

MR analysis

Adding carriers

Site splitting

Sector splitting

Site selection

Survey for antennareconstruction

RNC

NodeB

Antenna parameters

Scrambling codes ofneighboring cells

Location areas

Cell parameters

Antenna installation

Installation of NodeB

modules

Data preparation

Verification

Engineeringoptimization

Traffic balancing

Performanceimprovement

End

SBOM SBOMMain steps, inputs, and outputs

1. Collect traffic measurement data ->perform evaluation and analysis ->forecast the development -> masterexpansion requirements (for example,determine the RNC resources, sites,and sectors to be expanded)

2. Collect MR data -> performlocation and presentation -> analyzecoverage -> obtain coverageevaluation results (hot-spot areasand non-covered areas)

1. Master expansion requirements -> select an expansion method:increase soft capacity, add carriers,add macro NodeBs, add microNodeBs, and split sectors

1. Determine the expansion method,hot-spot areas, and out-of-serviceareas -> perform on-site survey ->select a site (macro NodeB and microNodeB) and meet sector splittingconditions

1. Master expansion requirements ->add RNC resources (boards andtransmission resources) -> add NodeBresources (boards and transmissionresources) 2. Master expansion requirements ->perform network design for RNCexpansion (boards and transmissionresources) -> perform network designfor NodeB expansion (boards,transmission resources, and resourcegroups)

1. Determine the site expansion scheme andsector splitting scheme -> perform analogemulation and plan antenna parameters ->plan neighboring cells for the computing nodeagent (CAN) -> plan scrambling codes for theservice control point (SCP) -> plan locationareas 2. Determine the networking strategy -> plan cellparameters

1. Create a site project -> install equipment 2. Perform sector splitting and sitereengineering -> reengineer NodeBequipment -> reengineer the antenna

system

1. Plan data -> prepare network elementplanner (NEP) data -> M2000 Download ->activate the cell -> verify on-site services

1. Perform a DT -> analyze DT data -> perform

RF optimization such as antenna parameters,scrambling codes, and neighboring cells

2. Collect traffic measurement data -> analyzetraffic measurement data -> adjust parametersand balance traffic -> adjust parameters andimprove KPIs

RNC expansion

Increasing softcapacity

Main steps, inputs, and outputs

Civil engineering

Network

evaluation

Networkdesign

Sitedeployment

Optimizationand

improvement

Siteengineering

Networkplanning

Selectionof the

expansionmethod

Sitesurvey


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Deployment RequirementsThis presentation does not provide details about each deployment step. For details, see the RAN14.0Multi-Sector Deployment Guide , RAN14.0 Multi-Sector RNP & RNO Guide , and RAN14.0 Multi-SectorTechnical White Paper .

Key points in each deployment step:Network evaluation and selection of the expansion method : Determine whether to performexpansion or capacity balancing. To perform expansion, determine whether multi-sector deploymentcan or need be used by considering multiple factors such as the market strategy, scenario, expectedcapacity increase, and limitation on expansion, and provide guidance in using multi-sector deployment ifrequired.

Survey and network design : In new deployment scenarios, site survey and network design for multi-sector sites are similar to those for common three-sector macro sites except that the RF module andantenna support six sectors instead of three sectors. In expansion scenarios, the expansion is furtherclassified into expansion by dividing the site, expansion by adding baseband boards, and expansionwithout adding baseband boards based on baseband board expansion.

Network planning : Plan neighboring cells. The multi-sector solution can use the automatic neighboring

cell/scrambling code planning function of the U-net.Site engineering and deployment : Minimize the service interruption delay. The CME one-keyconfiguration tool is configured. For details, see the RAN14.0 Multi-Sector Deployment Guide .

Network optimization : Perform RF optimization and neighboring cell optimization. The multi-sectorsolution can use the automatic neighboring cell optimization tool of the Npmaster. The matchingneighboring cell replacement algorithm is under discussion.

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Deployment 0 DownTime Temporary SectorSector 1:Service verification sector

Antenna in the temporary sector:The temporary sector uses thecommon Andrew's antenna ofsector 3 for which six-sectorreengineering has been completed.

In addition, the temporary sectoruses the original pole to ensurethat the coverage area is thesame as that of sector 1 throughrotation.

RRU in thetemporary sector

BBU DBS3900

Impact on services:1. During the first fiber relocation (from sector 1 to the temporary sector), calls are dropped. The temporarysector is surrounded by many cells so that users can be handed over to other cells at once and AMR callsare maintained. Several seconds later, you can see the scrambling codes of the temporary cell from themonitor set.2. During the second fiber relocation (from the temporary sector to sector 6), the impact is similar to theimpact during the first fiber relocation.

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Deployment 0 DownTime Site Rotation

Rotate the original antenna by60 to 90 degrees

Install the split antenna on the pole afterthe original antenna is rotated

Feeder

Connecting the jumper to thesplit antenna

Scheme 1: Rotate the original antennas by 60 to 90 degrees clockwise orcounterclockwise.Step 1: Rotate the three original antennas in the site at the same time.Step 2: Configure and install the split antenna on the pole based on the plan.Step 3: Connect the RRUs for new sectors to the split antenna and activate newcells.Step 4: Disconnect the jumper of the original antenna from the feeder andconnect the feeder to the jumper of the split antenna quickly.

Scheme 2: Rotate the original antennas by 120 degrees clockwise orcounterclockwise.The steps are similar to those in scheme 1 except that the fibers connected toports 0 to 2 of the BBU need to be exchanged to retain neighbor relationship afterthe original antennas are rotated by 120 degrees: 0->1, 1->2, and 2->0.

After that, exchange the fibers again.

Scheme 3: Based on scheme 1, change the order of operations, that is, performstep 1 after step 4, and rotate all new antennas properly at a time.

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Schem e 1

Schem e 1


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Contents



2 Solution Planning






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Performance MonitoringThe following table compares traffic-related KPIs before and

after sector splitting.


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Performance Monitoring (Continued)

The following table compares coverage-related KPIs before

and after sector splitting.


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Performance Monitoring (Continued)

The following table compares main traffic measurement

indexes before and after sector splitting.


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RF OptimizationTo properly use the energy radiated by antennas and

reduce inter-sector interference and coverage holes due toinappropriate sector planning , it is recommended that the

six-sector network topology should observe the following

principles (adjust related parameters such as the antenna

azimuth, downtilt, and height based on application

scenarios):

The antenna in a sector should point to the overlapped area of

two sectors in the adjacent NodeB.

Do not make the main lobes of the sectors in the adjacent

NodeB to be mutually opposite.

Avoid forming overlapping coverage in important areas.Page33


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Performance Parameter OptimizationIn RAN13.0 and earlier versions, key and difficult points of parameter optimization are neighboring

cell configuration. At present, the neighboring cell replacement algorithm when the neighboring cells

of the original network are in full configuration is under discussion. For details, see the RAN14.0Multi-Sector RNP & RNO Guide . You are advised to enable the function of reporting the detect set,

the function of adding cells in the detect set to the active set (for decreasing the call drop rate due to

missing neighboring cells), and the algorithm for missing neighboring cells (for facilitate the automatic

running of the tool for neighboring cell optimization).

In RAN14.0, the 63 neighboring cells feature can ensure sufficient neighboring cells. The specificscheme will be supplemented after the 63 neighboring cells feature is verified.

In particular, a multi-sector network can properly change the power allocation ratio of channels by

using the following methods to obtain better network performance at the cost of a little capacity gain:

Increase the pilot transmit power at the cost of a little capacity to ensure Ec/Io coverage and edge coverage

of the network.

Modify the power allocation ratio of public channels to ensure that KPIs such as access and paging do not

decrease obviously.

Essentially, the parameter optimization method is the same for the multi-sector network and the

common three-sector network, focusing on abnormal KPIs.

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Contents

Multi-Sector Solution1 Solution Introduction

2 Solution Planning



5 O&M and Troubleshoot ing



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At present, no special O&M contents are planned forRAN14.0 multi-sector solution. After this solution isdeployed, perform O&M based on the common three-sector network. O&M information unique to the multi-sector

solution will be supplemented.

O&M


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Troubleshooting

None

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Contents

Multi-Sector Solution1 Solution Introduction

2 Solution Planning

3 Solution Deployment4 Solution Optimization




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References

1. RAN14.0 Multi-Sector Technical White Paper

2. RAN14.0 Multi-Sector Deployment Guide

3. RAN14.0 Multi-Sector RNP & RNO Guide

4. RAN14.0 Multi-Sector Network Impact Report

5. RAN14.0 Multi-Sector Test Guide


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Documents

Introduction to the RAN14.0 Feature–Multi-Sector Solution