The New Jersey Institute of Technology's
Electronic Theses & Dissertations Project

Title:	Sub-segment based transport layer protocol for wireless medium
Author:	Sengupta, Som
View Online:	njit-etd2003-060 (xi, 45 pages ~ 2.0 MB pdf)
Department:	Department of Electrical and Computer Engineering
Degree:	Master of Science
Program:	Computer Engineering
Document Type:	Thesis
Advisory Committee:	Ansari, Nirwan (Committee chair) Karvelas, Dionissios (Committee member) Tekinay, Sirin (Committee member)
Date:	2003-05
Keywords:	Split TCP Wireless networks
Availability:	Unrestricted
Abstract:	This thesis discusses the techniques to improve the TCP over wireless. The loss-intensive wireless communication results in high retransmission rates to recover lost packets and bandwidth consumption. In addition, the retransmitted segments have significant chance of being dropped. To make the retransmission process more granular, large segments at the transport layer (540 bytes, by default) can be subdivided into smaller sub-segments. This document introduces a split TCP based solution and describes how to produce a series of smaller-sized segments that share the same transport layer header. A new header format is introduced to support the transmission of smaller segments and to conserve bandwidth during transmission. The NACK-based message exchange method is adopted with a special windowing protocol to achieve reliability, flow-control, and efficient buffer handling. The simulation results indicate that use of sub-segments improves latency, throughput, bandwidth, power and other measurements. In addition to that, an analytical model is developed to study the influence of sub-segmentation over latency and throughput.