Gugrajah_Yuvaan_ Ramesh_2003.pdf
Gugrajah_Yuvaan_ Ramesh_2003.pdf
Gugrajah_Yuvaan_ Ramesh_2003.pdf
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Introduction Chapter I<br />
load approximation can be adapted to evaluate the blocking probability in ad hoc<br />
networks. Analytical methods of solving blocking probability can potentially<br />
generate results orders of magnitude faster than simulation and can be used for<br />
network sensitivity analysis, design and optimisation.<br />
1.4. Dissertation Outline<br />
This dissertation focuses on the routing aspects of ad hoc networking. Chapter 1 has<br />
introduced the concept of ad hoc networking and described the application areas and<br />
technologies that have been associated with the expected deployment of ad hoc<br />
networks. The problems facing the development of ad hoc networks as well as the<br />
genealogy of the routing protocols for ad hoc networks have been discussed. The<br />
general methods for evaluating the blocking probability in wired and wireless<br />
networks were briefly mentioned.<br />
In Chapter 2, the routing protocols that have been proposed in the literature are<br />
reviewed. The different types of proactive and reactive routing protocols are<br />
described together with the hybrid, multiscope and hierarchical routing protocols.<br />
Some of the comparative simulations that have been published are examined. The<br />
concept of multicasting is also discussed.<br />
Chapter 3 is a description of a load balancing routing protocol and the modifications<br />
made in order to reduce traffic congestion and improve signal quality. The protocol<br />
is compared to other protocols using a custom built simulator. The physical layer<br />
model, medium access control model and mobility model used in the simulator are<br />
described. Results for packet delivery ratio and average end-to-end delay are<br />
presented. The results obtained show that the implementation of load balancing in the<br />
routing protocols for ad hoc networks is beneficial when the offered traffic is high.<br />
Chapter 4 is a review of the methods used to evaluate blocking probability in wired<br />
networks and wireless networks employing CDMA. The Erlang Loss Formula is first<br />
discussed which introduces fundamental concepts in loss network modelling. Loss<br />
1-7
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