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In this paper, utilizing the relay buffers, we propose an opportunistic decode-wait-and-forward relay scheme for a point-to-point communication system with a half-duplexing mobile relay network. The proposed scheme achieves the maximum throughput of &#x0398;(log K) at a cost of O(1) total transmission power and O(K=q) average end-to-end packet delay, where 0 &#x226A; q &#x2264; &#x00BD; measures the speed of relays' mobility. It can be proved that this system throughput is unattainable for the existing designs with low relay mobility. Therefore, the proposed relay scheme can exploit the time diversity and relays' mobility more efficiently.

A new scaling law on throughput and delay performance of wireless mobile relay networks over parallel fading channels