scholarly journals End-to-End Performance Evaluation of Selected TCP Variants across a Hybrid Wireless Network

10.28945/3022 ◽  
2006 ◽  
Author(s):  
Ayodeji Oluwatope ◽  
Biodun Obabire ◽  
G. Adesola Aderounmu ◽  
Matthew Adigun
Keyword(s):  
Wireless Network ◽  
Communication Networks ◽  
Network Simulator ◽  
Lossy Networks ◽  
Packet Losses ◽  
Computer Communication ◽  
Tcp Protocol ◽  
Hybrid Wireless Network ◽  
Tcp Westwood ◽  
End To End

Reliable transport protocols such as TCP are tuned to perform well in traditional networks where packet losses occur mostly because of congestion. TCP is intended for use as a highly reliable end-to-end transport protocol for transporting applications such as World-Wide Web (WWW) between hosts in packet-switched computer communication networks. TCP was originally designed for wired links where the error rate is really low and actually assumed that packet losses are due to congestion in the network. However, the increasing popularity of wireless networks indicates that wireless links will play more important role in future internetworks but TCP performance in such networks suffers from significant throughput degradation and very high interactive delays. TCP responds to all losses by invoking congestion control and avoidance algorithms, resulting in degraded end-to-end performance in wireless and lossy systems. Thus, in a bid to show and determine the possibility of adapting TCP protocol for optimal performance on the wireless link, this paper reviews and models the behaviors of TCP variants with a view to evaluate the end-to-end performance analysis of TCP versions: TCP Reno, TCP SACK and TCP Westwood (TCPW), which are designed to improve the performance of TCP in lossy networks. A wireless network model was developed using NS-2 network simulator which and the model was simulated. The results were analyzed in MATLAB 6.5 using throughput as a metric for comparison. The overall results indicate that TCP Westwood (TCPW) demonstrates better performance indices over other versions in a hybrid wireless network environment.

HWN* Framework Towards 4G Mobile Communication Networks

2010 ◽  
pp. 100-124
Author(s):  
Chong Shen ◽  
Dirk Pesch ◽  
Robert Atkinson ◽  
Wencai Du
Keyword(s):  
Wireless Network ◽  
Communication Networks ◽  
Resource Sharing ◽  
Relay Node ◽  
System Capacity ◽  
Spatial Reuse ◽  
Medium Access ◽  
Relay Nodes ◽  
Radio Access ◽  
Hybrid Wireless Network

The objective of the Hybrid Wireless Network with dedicated Relay Nodes (HWN*) proposal is to interface the Base Station (BS) Oriented Mobile Network (BSON) and the 802.11X assisted Mobile Ad hoc Wireless Network (MANET) so that one system can be utilised as an alternative radio access network for data transmissions, while the incorporation of the Relay Node (RN) is to extend the communication coverage, optimise medium resource sharing, increase spatial reuse opportunity, stabilise MANET link and create more micro-cells. The HWN* keeps the existing cellular infrastructure and a end-user Mobile Terminal (MT) can borrow radio resources from other cells through secured multi-hop RN relaying, where RNs are placed at pre-engineered locations. The main contribution of this work is the development of a HWN* system framework and related medium access and routing protocols/algorithms. The framework dedicatedly addresses the transparent multiple interface traffic handover management, cross layer routing, RN positioning and network topology issues to increase communication system capacity, improve Quality of Service (QoS), optimise transmission delay and reduce packet delivery delay.

scholarly journals End-to-End Performance Evaluation of Selected TCP Variants across a Hybrid Wireless Network 

10.28945/908 ◽  
2006 ◽  
Vol 3 ◽  
pp. 479-487 ◽  
Author(s):  
A.O. Oluwatope ◽  
A. B. Obabire ◽  
G. Adesola Aderounmu ◽  
Michael Adigun
Keyword(s):  
Performance Evaluation ◽  
Wireless Network ◽  
Hybrid Wireless Network ◽  
End To End

Hybrid Wireless Networks for E-Learning and Digital Literacy

2013 ◽  
pp. 233-245 ◽  
Author(s):  
Munir Abbasi ◽  
Lampros K. Stergioulas
Keyword(s):  
Wireless Network ◽  
Communication Networks ◽  
Network Architecture ◽  
Satellite Communication ◽  
High Capacity ◽  
Educational Content ◽  
Remote Communities ◽  
Wireless Technologies ◽  
Hybrid Wireless Network ◽  
E Learning

Today, satellite communication networks are being integrated into the infrastructure of modern Terrestrial communication networks and becoming popular for the delivery of educational content and data, as well as education-centric services, including information, tele-conferencing, entertainment, or “edutainment” services. With fresh demand for new services and applications, it is becoming essential that wireless network architecture seamlessly interoperate with new and existing technologies, protocols and standards. This paper presents recent work on the use of hybrid wireless network infrastructures for delivering tele-education and e-learning applications to remote communities by combining a variety of satellite, terrestrial and wireless technologies, and provides the results from live scenarios carried out employing various methods of interoperability testing. The analysis of the results examines a number of different issues such as delay, jitter, packet loss, latency, throughput measurement, and bandwidth. By combining satellite and terrestrial (wireless) technologies, full coverage and high capacity can be achieved for true broadband services for delivering educational content. The interoperability among such diverse networks imposes a number of challenges regarding service provision and management.

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