End to End Delay of VoIP over WiMax - International Journal of …ijeam.com/Published Paper/Volume...

International Journal of Engineering, Applied and Management Sciences Paradigms, Vol. 35, Issue 01

Publishing Month: May 2016

An Indexed and Referred Journal

ISSN (Online): 2320-6608

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End to End Delay of VoIP over WiMax

Hiba Osman Mohammed Osman1, Dr. Khalid Hamid Bilal2 and Dr. Amin Babiker A/nabi Mustafa3

1,2,3Al-Neelain University, Faculty of Engineering, Khartoum, Sudan

Publishing Date: May 30, 2016

Abstract

The aim of this paper is to evaluate the end to end delay

performance of VOIP over WIMAX for fixed and mobile

WIMAX networks using OPNET software for different types

of nodes. Keyword: WIMAX, VOIP, OPNET, QoS.

I. Introduction

The development of wireless communication

systems and networks in last years has been become an

important part of modern life style requirements. The

demand of high speed data transfer with high quality is

being the main factor for the development of

technology. WIMAX is a standard for wireless

communication which supports higher number of users

with higher data rates, coverage and availability. This

technology is based on IEEE 801.16 standards and it has

two versions Fixed WIMAX, based on IEEE 801.16d,

and the mobile WIMAX, based on IEEE 802.16e [1].

VOIP or internet telephony .It uses the Internet as a

telephone network with some additional capabilities.

Instead of communicating over a circuit-switched

network, this application allows communication

between sender and receiver over the packet-switched

Internet. Two protocols have been designed to handle

this type of communication: SIP and H.323.The Session

Initiation Protocol (SIP) was designed by IETE it is an

application layer Protocol that establishes, manages, and

terminates a multimedia session (call).H.323 is a

standard designed by (ITV) to allow telephones on the

public telephone Network to talk to computers (called

terminals in H.323) connected to the Internet [2].

There have been recent studies focusing on performance

evaluation of VOIP in WIMAX network.

Ahmed Hassan M.Hassan and Elrashed Ismail M.Zayid

made paper to examine VOIP over WIMAX network

and evaluated the performance for QoS Using OPNET

modeler. They made different scenarios to calculate the

performance for different number of node. They found

that when nodes increase the delay will increase [3].

Ojasvichhaniwal and MS minakshiHalder used NS2

network simulator to evaluate the performance of VOIP

over WIMAX, by creating WIMAX network scenario

with different routing protocols like DSDV, MADV and

AODV with different number of node, they found that

amount of delay in ADVD is less than DSDV [4].

M.A.Mohamed, F.W. Zaki and A.M. Elfeki evaluated

the performance of different VOIP codes over the

WIMAX network using OPNET modeler such as G711,

G.7231, and G729.they found that the G.723 is the best

one because it has lower delay [5].

Sheetal Jalendry, Shradha Verma examined VoIP in

WIMAX network with different codes (G.711, G.722,

G.723, G.726, G.727, G.728, G.729) OPNET modeler

16.0.A was selected as the simulation tool. The Packet

End-to-End delay for the voice code G.723.1 was the

highest. This is due to G 723.1 utilizes coding rate of 6.3

Kbps [6]

Anita Mishra, Neha Marria, Harsukhpreet Singh made

general simulation to estimate the performance of

WIMAX for supporting VOIP traffic using OPNET

modeler ,they made comparison between QoS classes

BE, ERTPS, NRPTS, RTPS, optimized ERTPS .they

found that ERTPS is the best one due to lower delay

performance [7].

The objective of this paper is to study analyse,

plan and design software program to simulate and

evaluate the performance of voice over IP over WIMAX

using OPNET software , the delay was considered as

QoS performance in this paper.

2. Description Analysis

The performance of VOIP over WIMAX

networks was planned and designed by OPNET

software for campus area of 400km2 with different

number of node varies between 5, 10, and 15 with

different transmitted power for fixed and mobile nodes.

3. Mathematical Modelling

The delay of a network is the time that packet

takes to travel from one node to another in the network.

There is accepted limited delay value a few milliseconds

to transmit a packet through a link from source to

destination. This delay occur result to congestion in the





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network. The delay can be calculated using the

following formula:

The Arrival Time is the time when the packet arrives to

the source node, the Delivery Time is the time when the

packet delivered to the destination node, Received

Packets is the total number of packets received between

the start time, tn of frame n and the start time, tn+1 of

the next frame n+1[8]

4. Computer Modelling

NO

Yes

Figure 1: Computer Modelling

Simulation time= simulation+20s

Simulation time = 0s

0se0sarea=20tkm2=20*20km^^

^^^^^^^^^=

Average

delay=

Configure network

No of node, No of cell, transmitted power

End

Simulation time ≥

180s

Simulation area=20*20km2

Generate packet

Select type of WIMAX network

Plot delay via

simulator

Start





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5. Simulation Parameter

Table 1: Simulation Parameter

Value Parameter Fixed ,mobility Type of WIMAX Network

VoIP Application 5,10,15 Nodes

3 minutes Simulation time

3,5 Number of cell

G7.11 Coding

0.5,1w Transmitted Power

6. Simulation

OPNET software used to simulate and evaluate the performance of VOIP over fixed and mobile WIMAX network. It was

showed different scenarios.

Figure 2 : Three Cells with Mobile Nodes





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Figure 3 : Three Cells with Fixed Nodes

Figure 4 : Five Cells with Mobile Nodes





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Figure 5 : Five Cells with Fixed Nodes

7. Results

The simulation was implemented and we get the following results:

Figure 6: Average Delay for Mobile Nodes with Power Value 0.5w and Variable Number of Node (5, 10, 15)





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Figure 7: Average Delay for Fixed Nodes with Power Value 0.5w and Variable Number of Node (5, 10, 15)

Figure 8: Average Delay for Mobile Nodes with Variable Power (0.5, 1) w and 5 Nodes





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Figure 9: Average Delay for Fixed Nodes with Variable Power (0.5, 1) w and 5 Nodes

8. Result Analysis

If we look into the figures above we find that in

mobile and fixed network when number of node

increase the delay will increase, result to the congestion

that occur between nodes, When number of node was 5

the average end to end delay for three cells with mobile

nodes was 0.002 while it was 0.007 for fixed nodes and

it was 0.002 for five cells with mobile nodes while it

was 0.008 for fixed nodes. When number of node was

10 the average end to end delay for three cells with

mobile nodes was 0.002 while it was 0.008 for fixed

nodes and it was 0.003 for five cells with mobile nodes

while it was 0.009 for fixed nodes.

When transmitted power increase the end to end delay

increase in mobile nods but it was constant in fixed

nodes, when the power was o.5w the average end to end

delay for three cells with mobile nodes was 0.007, while

it was 0.008 for three cells when the power was 1w and

it was 0.002 for three cells with fixed nodes for both

transmitted power values.

9. Conclusion

The performance analyses of VOIP over fixed and

mobile WIMAX networks have been done by measuring

and calculating the end to end Delay for different

scenarios using OPNET software.

References

[1] Preetinder Singh, Ravneet Kaur "VOIP Over

WIMAX: A Comprehensive Review" 2014

[2] Behrouza. Forouzan "Data communication and

networking" 2007

[3] Ahmed Hassan M.Hassan, ELrasheed Ismail

M.Zayid "performance evaluation of QoS in

WIMAX network" May 2015

[4] Ojasvichhaniwal and MS minakshiHalder "Design

and Implementation of QoS in WIMAX module

using two –ray ground and shadowing mobility

model under NS-2" April 2015

[5] M.A.Mohamed, F.W.Zaki and A.M. Elfeki

"performance Analysis of VOIP codecs over

WIMAX networks" November 2012

[6] Sheetal Jalendry, Shradha Verma "Performance

Analysis of various Codecs Schemes of VOIP over

WiMAX" June 2015

[7] Anita Mishra, Neha Marria , Harsukhpreet singh"

performance Evaluation of WIMAX network with

High QoS services incorporating Different physical

and Mac layer slanders" April 2015

[8] Ibrahim A. Lawal, Abas Md Said and Abubakar

Aminu Mu’azu "Simulation Model to Improve QoS

Performance over Fixed WiMAX using OPNET"

February 2013.

End to End Delay of VoIP over WiMax - International Journal of …ijeam.com/Published Paper/Volume...

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