Use this URL to cite or link to this record in EThOS:
Title: Header complression for next generation wireless links
Author: Tye, Ching Shen
ISNI:       0000 0004 2668 3006
Awarding Body: University of Aberdeen
Current Institution: University of Aberdeen
Date of Award: 2009
Availability of Full Text:
Access from EThOS:
This thesis reviews the subject of compression for wireless links, where additional processing at the sender and receiver can dramatically improve the transmission capacity of a communication link. The placement of compression functions within the OSI reference model is discussed. Applying compression at the appropriate layers is important, simulation results show that there is seldom benefit from compressing the same data twice. The efficiency of link-layer compression methods consequently also depends on whether (and at what level) encryption and/or higher-layer compression are applied. The thesis therefore investigates issues that impact link performance, relating these to application requirements, and the characteristics of the communication channel. The focus of the thesis is on packet header compression, which operates only on the protocol control information carried in packet headers. The behaviour of packet header compression algorithms are related to the IETF-defined Robust Header Compression (ROHC) framework. Where the packet headers form a large proportion of the total packet size, such as Voice-over-IP, such methods significantly improve the link compression efficiency. This thesis evaluates these algorithms in terms of compression efficiency and the reliability requirements of the link. The issue of compression IPv6 headers is also discussed. Several important issues in implementing ROHC are described, such as a lack of public domain information concerning algorithms, design choices, and source code, which make the current specifications complicated and difficult to understand. Despite this, the work concludes that these ore similar methods could have significant benefits for wireless links. To illustrate the feasibility of this approach, a satellite Independent Header Compression scheme is introduced. This proposes a basic framework for robust header compression suited to a satellite environment. This is intended to form a basis for development of methods that will be found in future satellites links.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available