An Investigation On An Efficient Approach Of Improving Quality Of Service Of Voip Over Satellite
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Date
2007-06
Authors
Abdule, Sayid Mohamed
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Abstract
The importance of Voice over Internet Protocol (VoIP) is slowly being
recognized by the telecommunications industry. In the past decade, many VolP
applications have been developed, offering a wide range of benefits to both
telecommunications and network service providers. However, the Quality of
Service currently available in VolP networks is not comparable to traditional
telephone voice quality. The current limitations of VolP include relatively high
bandwidth consumption, packet loss, traffic congestion and excessive delay.
The objective of this study is to improve the performance of VolP over
satellite communication links. This is achieved by implementing satellite VolP
protocol gateways that would reduce the number of transmitted VolP packets
and reduce bandwidth usage by increasing the number of VolP frames sent per
packet. The proposed protocol is called Multiple Frames Single Packet (MFSP).
Network simulator (NS2) version 2.28 was utilized to evaluate different
scenarios to determine the effectiveness of MFSP. Scenarios including
different codecs with different payload sizes, the effect of Variable Bit Rate
(VBR) vs. Constant Bit Rate (CBR) vis-a-vis bandwidth consumption, as well as
the effect of MFSP on packet delay and jitter were studied.
The study found that the MFSP protocol not only reduces the number of
VolP packets sent through the network but it also reduces the overall bandwidth
usage. Moreover, MFSP addresses the problem of smaller packets transmitted
over satellite links with high propagation delays. Based on the results, it could
be seen that MFSP is an effective mechanism through which the overall OoS of
VolP over satellite links can be enhanced.
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Keywords
To improve the performance of VolP , over satellite communication links.