CHAPTER 7 WiMAX network dimensioning and planning

IntroductionObjectives to be defined in planning:The service area.The cell radius.The minimum number of cell sitesThe antenna height.The type of base stations.The locations of base stations.

When to plan?

When installing new system

When to meet new requirements

When new techniques appear

WiMAX Planning

1.Dimensioning 2.Planning

1.Cell dimensioning of WiMAXIt is the first step of radio network planning

It is used estimate the number of required base stations in accordance with the theoretical approach

It is based on the assumption of uniform distribution of subscribers, homogenous morphology and ideal site distribution

Cell dimensioning process1.Network Requirements

2.Coverage Analysis

3.Capacity Analysis

4.Nominal Cell planning

4.Nominal cell planing

It is a graphical representation of the network

Do not care about the position of the sites

Hexagonal shaped cells are adopted

2.WiMAX network planning processNetwork

dimensioning

1.Site surveys

2. Field measurement

s3. System

design

4. System tuning

5. System growth

1.Site surveySite search.

Checking the validity of each location of the sites

Site location lease agreement.

Carrying out the construction of the civil works.

2.Field measurementsChoosing the frequency point of the

measurementField measurements site choiceThe tools for field measurement

3.System designThe final cell plans used for network

installations provide that no dead zones and the overlap

between sites is small as possible.

4. System diagnosisThe driving test team uses a mobile testing

toolkitThe testing tool includes: i. Mobile test units (MTUs) in cars and fixed test

units geographically distributed. ii. Mobile station with special software, a portable

personal computer (PC) and a global positioning system (GPS) receiver.

iii. Mobile traffic recording (MTR) iv. Cell traffic recording (CTR)

5.System tuningAt the initial network launch it ensures that the network

performs as per the design and is free from configuration and implementation faults

involves finely tuning the network after the configuration faults are eliminated by selecting appropriate network parameters to achieve the set QoS targets

6. System growthif the network needs to be expanded to extend

coverage due to increase in traffic or because of changes in the environment

Uniform solution of WiMAX network planningCase study one Rural environment Area to be covered= 140 km2 The area surroundings are: at north Al Rabwa, at south media production

city, at east desert road, and at west Al Bashayr. Cell radius= 7.4 km All the sites with gain 12dBi, the BTS antenna height is 50 meters

Case study two Dense Urban environment Area to be covered= 79.8 km2 The area surroundings are : at north Elwarrak, at south Giza square , at

east Nile river, and at west Kafr Hakim. Cell radius= 3.2 km All the sites with gain 18dBi, the BTS antenna height is 30 meters

Non uniform solution of WiMAX network planning

Case study one (DU)All BS sites are 3 sector cells, with directional antenna with

narrow HPBW, gain 18 dBi and height 30m.Area to be covered =79.8 km2

Cell radius= 3.2 km

Case study two(UR)All BS sites are 3 sector cells, with directional antenna with

narrow HPBW, gain 17 dBi and height 40m Area to be covered =120 km2

Cell radius= 4.8 km

Case study three(SU)All BS sites are 3 sector cells, with directional antenna with

narrow HPBW, gain 16 dBi and height 50m.Area to be covered =130 km2

Cell radius= 5 km

Case study four(RU)All BS sites are 3 sector cells, with directional antenna with

narrow HPBW, gain 15 dBi and height 60m.Area to be covered =207.15 km2

Cell radius= 8.9 km