Date of Award


Document Type

Master Thesis

Degree Name

Master of Engineering (Research)


Electronic Engineering

First Advisor

Dr. Dirk Pesch


The direction of the global cellular industry is primarily determined by two standardisation bodies, the 3rd Generation Partnership Project (3GPP) (in Europe and Asia) and 3GPP2 (in North America). Both of these standardisation bodies are currently specifying a core network to deliver IP based multimedia services over 3G wireless networks. One of the fundamental building blocks of this IP based multimedia core network is the use of SIP (Session Initiation Protocol) as the control protocol. The radio resource, that is the available frequency spectrum, in wireless communication systems remains a limiting factor in terms of the bandwidth available to an individual user. More than a decade of research, standardisation and development has been spent in bandwidth optimisation of GSM signalling protocols. Because SIP is an ASCII text based protocol, messages are long, up to and over 800 bytes. Therefore, the use of SIP for advanced signalling to support IP based multimedia in cellular networks would reverse the effort that has gone into signalling optimisation. The Session Initiation Protocol initiates interactive communication sessions between users. It also handles termination and modification of sessions. SIP does not actually define what a "session" is, this is described by the content carried within the SIP messages. This study presents a compression technique called Text Based Compression using Cache and Blank approach (TCCB). This technique proposes a means to combat these adverse effects by reducing the size of SIP messages before they are transmitted. The compression scheme presented is efficient and simple employing a variety of features to ensure maximum possible compression of each message can be achieved without sacrificing the integrity of the messages transmitted. The non-invasive implementation of the proposed scheme also makes it an attractive strategy for achieving efficient usage of available radio resources and reducing call set-up delay so that it might be in the acceptable region of GSM.


Submitted to the Higher Education & Training Awards Council, July 2003

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