Ž . Two important issues that need to be addressed when designing medium access control MAC protocols for Wavelength Division Multiplexing networks are message sequencing and channel assignment. Channel assignment addresses the problem of choosing an appropriate data channel via which a message is transmitted. This problem has been addressed extensively in the literature. On the other hand, mes...

The design of a wireless local area network (WLAN) has two major issues: determining the best placement of base stations (BS) and assigning the frequency channels for those stations. The correct BS placement minimizes installation costs. The adequate channel assignment reduces signal interference and improve network throughput. This paper reports a real experience where we applied the concepts ...

This paper analyzes dynamic channel assignment in cellular systems where the base stations are placed at random. Using a simple dynamic channel assignment algorithm, random systems are compared to an ideal hexagonal systems. Under log-normal shadow fading the random system has capacity within 1dB of the hexagonal system. This paper looks at both the uplink and downlink and finds that performanc...

We study in this paper the feed-through pin assignment problem for cell based design that assigns global nets to feed-through cells or implicit feed-through ports. On a single row, for a restricted permutation of global nets, we develop a graph theoretic approach for optimally minimizing the density of the channel above (below) the row subject to the bound on the density of the channel below (a...

To my mother, who has always been by side, during all the ups and downs in my life. iii ACKNOWLEDGEMENTS First, I would like to thank my adviser Prof. Raghupathy Sivakumar for his unwavering guidance and motivation. His high standards in clear thinking and effective communication are inspiring and will always help me stand in good stead. The GNAN research group gave me the opportunity to work w...

In this paper, we propose a distributed congestion-aware channel assignment (DCACA) algorithm for multi-channel wireless mesh networks (MC–WMNs). The frequency channels are assigned according to the congestion measures which indicate the congestion status at each link. Depending on the selected congestion measure (e.g., queueing delay, packet loss probability, and differential backlog), various...

The rapid development of mobile communications has caused a higher demand of radio channel or carrier frequency due to additional mobile subscribers. With a limited frequency bandwidth allocated to mobile operators, good network planning is important to avoid congestion in the network. Some of the methods used to improve congestion in mobile networks is cell splitting and frequency reuse, but w...

Previous studies by the author examined the feasibility of applying channel changing strategies in ad hoc networks, with varying degrees of mobility, as a means to improve total system throughput and individual flow throughput, as well as to reduce network congestion. These studies presented several heuristic methods that allowed a greatly improved performance to be delivered per network flow. ...