Distributed dynamic channel assignment with violation to the reuse pattern for microcellular networks

In this paper, the frequency reuse and the distributed dynamic channel assignment for microcellular networks are studied. We show that it is possible to use carriers with violation to the frequency reuse pattern with an insignificant degradation of the quality of service. As a result, a new family of distributed dynamic channel assignment algorithms is presented: the DDCA with violation to the reuse pattern (DDCA with VRP) strategies. The DDCA with VRP schemes allow to use carriers with at most one violation to the reuse pattern, under the restriction that both cells using simultaneously the same carrier must be the farthest cells of their interference neighborhoods. The results show that the use of carriers with VRP is an effective strategy to increase the system capacity at the expense of an insignificant degradation of the quality of service. This is due to the fact that the carriers are employed with VRP by short time intervals in the least harmful situations. We propose and evaluate five DDCA with VRP schemes and everyone overcomes the performance of the maximum packing (MP) algorithm, with limited carrier usage information and without the need of centralized coordination neither global carrier rearrangements.