Quasi-static channel assignment algorithms for wireless communications networks

Quasi-static channel assignment algorithms for wireless communications networks are proposed and examined in this paper, More specifically, for (i) a given number of available channels (ii) locations of the cells and co-channel interference relations among the cells and (iii) channel requirement of each cell, we attempt to find a feasible channel assignment policy on a quasi-static basis to satisfy the channel requirement for each cell without using the same channel for any adjacent cell pair to avoid co-channel interference. This satisfiability algorithm can also be applied with the concept of bisecting search to minimize the number of total channels required. This channel assignment problem can be considered as a multi-coloring problem. We specify an integer programming formulation of the problem, which leads to the development of an efficient and effective channel assignment heuristic. In the computational experiments, the proposed algorithm calculates optimal solutions for test networks with up to 100 cells in minutes of CPU time on a PC.