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Based on the concept of contention reservation and polling transmission, user-dependent perfect-scheduling multiple access (UPMA) protocol for supporting node mobility and multihop architecture in wireless multihop mobile ad hoc network (WMMANET) is described. Based on clustering architecture acquired by self-organizing algorithm, it provides wireless access in a WMMANET with any kinds of topologies. On the other hand, the problem of intercluster traffic relay is sufficiently designed for nodes only having one set of half-duplex transceiver. In the protocol, channel utilization is improved greatly with the help of appropriate arrangement scheme between access period and polling period and any active nodes are guaranteed to access channel rapidly by means of an effective collision avoidance and resolution protocol. Moreover, we provide performance analysis on its throughput, delay and message dropping probability. Finally, the analytical results are shown to validate the effectiveness of the proposed protocol.