Allocation Scheme for Multi-layer Cellular Network with Integrated Traffic

Next generation wireless technology will support mobility for multimedia applications. In this investigation, we develop analytical models for predicting the blocking probabilities in multi layer cellular network providing integrated services to a population of mobile users. The analytical models are based on continuous time multi-dimensional birth-death approach having double layer cellular architecture. There is a provision of reserved channels to give the priority to handoff calls. By using releasing function (RF), the reserved channels may also be allocated to new calls in case when reserved channels are free. The channel assignment technique optimizes the quality of service (QoS) of low speed moving terminals (LSMT) and high speed moving terminals (HSMT). The lower layer of the proposed architecture is based on microcellular architecture, for absorbing the traffic loads of low speed moving terminals (LSMT). The higher layer is based on a macro-cell umbrella solution, for absorbing the traffic load of HSMT in a congested urban area. The provision of subrating of the guard channels (GC) for handoff calls of LSMT in each microcell has been made. We analyze the performance of channel assignment scheme based on new call bounding, cutoff priority and subrating. To validate the scheme suggested, we provide numerical results. The sensitivity analysis has been carried out to examine the effect of system descriptors on various measures of performance, namely blocking probabilities, carried load, etc.