Dynamic bandwidth reservation for multimedia and data applications in mobile wireless cellular networks

In order to meet the ever increase in users' demand, and to accommodate more number of users, the cell size in mobile wireless cellular networks is being reduced. Because of that bandwidth in each cell has become limited. Due to decrease of cell size more number of handovers takes place. If bandwidth allocation to these handover calls is not done properly then dropping probability of handover calls will be increased. Also if sufficient bandwidth is not available to new calls, then blocking probability for newly generated calls will be increased. Dropping of handover calls is less desirable than blocking of new calls. Many schemes have been proposed to solve the problem in resource allocation. Presently available solutions are not enough to provide and maintain QOS (Quality of Service) for multimedia handover calls. In this paper we propose the GPS based handover mechanism which will reserve bandwidth in one cell and unnecessary reservations at many neighboring cells are avoided. Also we propose bandwidth reservation and allocation to handover calls using sliding bandwidth window method. In this method, bandwidth window size will change according to network traffic conditions and it is maintained flexible in changing its size. Based upon the expected number of handover calls, the window size changes its capacity, so that more number of handover calls can be accommodated. In order to maintain QOS (Quality of Service) for multimedia handover calls, our focus, in this paper, is to allocate required bandwidth to this call. For lower priority handover call (data call), at least minimum bandwidth will be allocated in worst case scenario. In the mean time, we maintain the balance with locally generated calls in allocation of bandwidth. In this method dropping probability of handover calls is reduced to minimum and blocking probability of new calls is also maintained to minimum.