Download - wimax_presentation- Case Study.ppt
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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