Moving direction DDCA algorithms with violation to the reuse pattern for highway microcellular systems

In this work, moving direction distributed dynamic channel assignment (DDCA) strategies with violation to the reuse pattern (VD-DDCA) for highway microcellular systems are proposed. It is shown that the outage probability degradation caused by one violation to the reuse pattern (VRP) when moving direction (MD) strategies are used in the acquisition channel policy (ACP) is negligible. The local packing (LP) algorithm was modified to allow the use of two different MD strategies with VRP, resulting in the VDLP1 and VDLP2 algorithms. We consider a highway microcellular environment composed of concatenated segments, where each segment is a microcell of 2000 m length. The characteristics of user mobility are considered and a free-flowing vehicular traffic is assumed. Simulation results show that the use of MD strategies with VRP in the ACP of the DDCA algorithms, produce a considerable increase in the system capacity at the expense of an insignificant degradation of the quality of service. For a grade of service (GOS) of 0.1, the VDLP1 and VDLP2 carry 4% and 1.5% more traffic than the maximum packing algorithm, respectively. For the same GOS, the outage probability of the VDLP1 algorithm is, in value, 0.0011 greater than the upper bound of the outage probability without VRP.