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TCP performance Enhancement in IEEE 802.16j MMR WiMAX Networks

FATH ELRAHMAN ISMAEL KHALIFA AHMED

 

Ph.D. Student

UTM MIMOS CoE Telecommunication Technology

Faculty of Electrical Engineering

Universiti Teknologi Malaysia

81310, Johor Bahru

Johor Darul Ta`zim

Malaysia

 

Tel.: 0177367681

 

E-mail: fathi_sml@yahoo.com

 

Abstract

 

The IEEE 802.16 standard, also known as Worldwide Interoperability for Microwave Access (WiMAX), is viewed as one alternative to provide last mile access to the internet users. Since almost WiMAX networks pose many problems, including poor QoS for the indoor users and users in the cell boundary, IEEE802.16j Mobile Multi-hop Relay (MMR) Task Group proposes a new relay station (RS) which can be used as an extension to the base station (BS) and relay traffic between the BS and the mobile station (MS). Although the improvement in channel quality, the use of RS in MMR WiMAX networks introduces much delay due to relaying packets through multiple hops. The Transmission Control Protocol (TCP) is the most commonly used transport protocol on the Internet. The delay of relaying both TCP packets and ACK in MMR WiMAX Networks causes the Retransmission Time Out (RTO) in the transport layer to expire and trigger the TCP retransmission which degrades the throughput of TCP connection. In this project a new bandwidth grant algorithm will be proposed to decrease the delay of the bandwidth request in MMR WiMAX networks. Furthermore, the regular TCP is not suitable for wireless networks because packet losses will occur more often due to unreliable wireless links than due to congestion, and the error recovery mechanism in the Transport Layer and MAC Layer are not aware of each other. So, the cross-layer design is proposed to improve TCP performance on wireless network, specifically, over the IEEE 802.16j WiMAX. The key features of the proposed solution are that the feedback information about channel state and the TCP parameters will be used to adaptively control the ARQ parameters, and retransmission decision between sender and receiver. The cross-layer design is a new paradigm to provide better performance gain. The simulation using Network Simulator will be used to show the performance enhancements of TCP connection over the IEEE 802.16j WiMAX networks.

PUBLICATIONS

1. Fath Elrahman Ismael, Sharifah K. Syed-Yusof, and Norsheila Faisal, Bandwidth Grant Algorithm for Delay Reduction in IEEE 802.16j MMR WiMAX Networks, International Review on Computers and Software (I.RE.CO.S), Vol. 5,N. 2, March 2010.(pdf)

2. Fath Elrahman Ismael, Sharifah K. Syed Yusof, and Norsheila Faisal, An Efficient Bandwidth Demand Estimation for Delay Reduction in IEEE 802.16j MMR WiMAX Networks, International Journal of Engineering (IJE), Vol.3 Issue 6, Jan. 2010.(pdf)

3. Fath Elrahman Ismael, Sharifah K. Syed-Yusof, and Norsheila Faisal, Reduction of the Bandwidth Request Delay in IEEE 802.16j MMR WiMAX Networks , ICACSIS 2009, Jakarta 7 to 8 December 2009, ISSN:2006-1796, p 295-299.(pdf)

4. Fath Elrahman Ismael, Sharifah K. Syed Yusof, Mazlan Abbas, Adnan Shahid Khan, and Norshiela Fisal "Throughput Enhancement in MMR WiMAX IEEE 802.16j Networks", 3^rd International Graduate Conference on Engineering, Science, and Humanities, Johor Bahru, 2-5 Nov. 2010.(pdf)

5.  Fath Elrahman Ismael, Sharifah K. Syed Yusof, Mazlan Abbas, Adnan Shahid Khan, and Norshiela Fisal "TCP Packet Loss Reduction for MMR WiMAX Networks using Cross Layer Design", 3^rd International Graduate Conference on Engineering, Science, and Humanities, Johor Bahru, 2-5 Nov. 2010.(pdf)

6. Adnan Shahid Khan, N. Fisal, N.N.M.I. Ma`arof, Fath E.I. Khalifa, M. Abbas, and Hashim E.A. Elshafei, "Security Zone and Key Derivation Management in Centeralized Security Control in WiMAX Multihop Relay System", 3^rd International Graduate Conference on Engineering, Science, and Humanities, Johor Bahru, 2-5 Nov. 2010.(pdf)

7.  Adnan Shahid Khan, N. Fisal, Hashim E.A. Elshafei, Fath E.I. Khalifa, M. Abbas, and Masoumeh Shaneshin, "An Overview of Security challenges of Next Generation Mobile WiMAX IEEE 802.16m Technology", 3^rd International Graduate Conference on Engineering, Science, and Humanities, Johor Bahru, 2-5 Nov. 2010.(pdf)

8. Adnan Shahid Khan, N. Fisal, Hashim E.A. Elshafei, Fath E.I. Khalifa, M. Abbas, and N.N.M.I. Ma`arof,"Provisioning of Public Key Infrastructure (PKI) and Security Issues in IEEE 802.16m Networks", 3^rd International Graduate Conference on Engineering, Science, and Humanities, Johor Bahru, 2-5 Nov. 2010.(pdf)

EDUCATION & WORK EXPERIENCE

i. MEng, Electronics Engineering (Communications),Sudan University of Science and Technology (SUST), Sudan,2006.

ii. Bsc, Electronics Engineering (Communications),Sudan University of Science and Technology (SUST), Sudan, 2002.

Currently, he is doing his PhD in Electrical Engineering at the Faculty of Electrical Engineering, Universiti Teknologi Malaysia, Skudai, 81310, Johor, Malaysia under the supervision of Ass. Prof. Dr. Sharifah Kamilah Bt. Syed Yusof and Prof. Mazlan Abbas. His current research interests are in the area of resource allocation, WiMAX networks, Multi-hop Networks, and TCP performance optimization.