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In cellular networks. it is vital to allocate communica­ tion channels efficiently because the bandwidth allocated for cellular communication is limited. When mobile hosts move from one cell to another cell. to provide uninterrupted service. the new cell should have enough channels to sup­ pan the ongoing communication of the mobile hosts that moved into the cell. If channels are statically allocated. as is the case in current cellular networks. a cell may run out of channels when large number of mobile hosts move to a cell. thus degrading the quality of service. To over­ come this problem. dynamic channel allocation approaches have been proposed. Under dynamic channel allocation. channels are allocated to cells on demand. thus increasing channel utilization and hence improving the quality of ser­ vice. Such channel allocation approaches fall under two categories. namely. centralized and distributed. Central­ ized approaches are neither scalable nor reliable. while dis­ lributed approaches have the potential to be both reliable and scalable. In this paper, we present a distributed dy­ namic channel allocation scheme for cellular networks that is fault tolerant. Our approach can tolerate the failure of mobile nodes as well as static nodes and enhance the qual­ ity of service by making efficient reuse of channels.

A Fault-Tolerant Dynamic Channel Allocation Scheme for Enhancing QoS in Cellular Networks