Wimax Network Planning

Objectives design an optimum mobile and internet

network based on WiMAX technology for nablus city

offer high speed internet accessa high quality mobile network based on

VoIP technology.To make us capable to deal with problems

and to solve them with scientific approach and with engineering sense

Contents:Equipments used in the project.

Radio network palnning.

Radio network capacity.

Simulation of network phases.

Equipments used in the project: Airspan hypermax-base station . HyperMax Base station

Towers with different heights Feeders with different sizes Airspan Pro-ST and Easy-ST receivers.

Specifications:HyperMax base station

Mobile wimaxYesFixed wimaxyesFrequency bands2.3GHz, 2.5GHz, 3.3GHz, 3.5GHz, 3.7GHz,

4.9GHzChannel size20MHz, 10MHz, 7MHz, 5MHz, 3.5MHz,

1.75MHzFFT2.48 ,1024 ,512 ,256Tx power(frequency band dependant)

Up to 40 dBm

Maximum EiRP per sector

+63 dBm

Cont.Antennas : the antennas we used for our network are J3301xD00 dualpolarity 3.5 GHz WIMAX sector antenna .

Antenna Specifications

Specifications:Part number : J3301xD00-xxN

Frequency range3300 – 3800 MHz

Gain (dBi) @ 3.5 GHz18( 60o , )16 (90o)

VSWR <1.8 : 1

PolarizationDual : Vertical and Horizantal

Azimuth beamwidth60o or 90o

Elevation beamwidth7o

Null FillDown to -25o

Sidelobe SuperssionFront –to-back RatioDimension

>30 dB >20 dB

28 ”x 11” x 6” (711 x 279 x 152mm)

The radio network design requirements are related to coverage, capacity and services and they are specified for each area type: dense urban, urban, suburban and rural.

Capacity requirementsPhase one 1- Data traffic A – residential subscribers : 9000 residential users eachof 1 Mbps,

with over subscription rate of 1:20. B - Business subscribers: 1000 business users each of 2 Mbps, with

over subscription rate of 1:10. 2–Voice traffic: 40,000 voice subscribersPhase two 1- Data traffic A – residential subscribers : 18000 residential userseach of 1

Mbps, with over subscription rate of 1:20. B - Business subscribers: 2000 business users each of 2 Mbps, with

over subscription rate of 1:10. 2 – Voice traffic: 100,000 voice subscribers .

Radio network palnning.

Cont.coverage requirementsPhase onethe required percentage of the deep indoor and indoor coverage

in this phase will be at least 70 % .Phase twothe required percentage of the deep indoor and indoor coverage

in this phase will be at least 75 % .

Signal strength levelsRequired signal strength = - 95 dBm Estimation of SSdesign

1- Outdoor = -79 dBm.2- Indoor = -73 dBm.3- deep Indoor = -58 dBm.

Radio network capacity

subchannelization

Cont.Capacity of a single base station The bandwidth for each sub-carrier is 10.94 KHz , then,

the bandwidth for each sub-channel will be: 10.94 * 32 = 350.08 KHz . For Airspan equipments, the capacity is simply 3.5 bit/Hz

of the bandwidth, so, for 350 KHz channel the capacity is: 3.5 * 350*10^3 = 1.225 Mbps for each sub-

channel . For three sector base station the total capacity is (16 * 1.225)*3 = 19.6*3 = 58.8 Mbps .

Earlang to bps conversion In order to complete the capacity estimations we needed to

convert the unit earlang to bit per seconed For voice traffic, we have many algorithms for coding and

compression of the voice samples, and here we will use G.729(A) algorithm .

For G.729(A) coding algorithm, the frame duration is 10 ms as shown in the figure below:

Number of frames in one second = 1/ (10 * 10^-3) = 100 Frames,

the following table shows the bandwidth of one complete frame:

Total bandwidth per second of call

Each user should have 25 mErlang of capacity, which are equivalent to 90 seconds, from the table above each second is 84.8 Kbit of traffic, So, 90 seconds equal to :

90 * 84.8 = 7632 Kbit = 7.632 Mbit.

Ethernet protocol overhead per frame

Other overhead per frame

Voice sample size

Frames per second

Total overhead in bits per

second

Voice enconding

Total bandwidth

per call

26 Bytes40 Bytes10 ms100(26+40 =)66 B/frame*100 =6600*8bit/B

=52800bps

G.72932 Kbps84.8 Kbps

Planning of network

Simulation of Phase One

Total traffic of all subscribers has been estimated to be as follows:

For residential users: 9000*1 Mbps / 20 = 450 Mbps.For business users : 1000*2 Mbps / 10 = 200 Mbps.For voice users : 7.632 *40000 = 305280 Mbit

From calculations we found that we need 13 base stations to meet our requirements.

From this map we calculate the percentage of the coverage , the following figure show the results with respect to the area of Nablus which is 25.397 km²

Simulation of the second phase

Total traffic of all subscribers has been estimated to be as follows:

For residential users : 18000*1 Mbps / 20 = 900 Mbps .For business users : 2000*2 Mbps / 10 = 400 Mbps .For voice users : 7.632 * 100,000 = 763200 Mbit.

As a result of increasing number of subscribers in our operator , we need to improve our network in both sides ; capacity and coverage, to be able to serve all needs of subscribers with high quality at all times.From calculations we find that we need 26 BTS’s to serve this phaseSo we add another 13 sites to the original 13 sites from phase one

By this distribution of sites our network meets the coverage and capacity requirements for the second phase,

The chart bellow shows the percentage of deep indoor, indoor, outdoor, and poor signal levels.

And the following chart shows the comparison between phase one and phase two

Why WiMAX network is superior the following shows the difference between our network and the currnt GSM network, and a previous study using GSM tech., the table shows the ability of WiMAX to serve large number of subscribers with minimum number of BS’s, with better quality and new services

Current GSM network

Previous study using GSM

WiMAX network

Number of base staions

802026

Number of subscribers

100,00050,000100,000

Thank you

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