  In this paper, we propose an opportunistic buffered decode-wait-and-forward
(OBDWF) protocol to exploit both relay buffering and relay mobility to enhance
the system throughput and the end-to-end packet delay under bursty arrivals. We
consider a point-to-point communication link assisted by K mobile relays. We
illustrate that the OBDWF protocol could achieve a better throughput and delay
performance compared with existing baseline systems such as the conventional
dynamic decode-and-forward (DDF) and amplified-and-forward (AF) protocol. In
addition to simulation performance, we also derived closed-form asymptotic
throughput and delay expressions of the OBDWF protocol. Specifically, the
proposed OBDWF protocol achieves an asymptotic throughput O(logK) with O(1)
total transmit power in the relay network. This is a significant gain compared
with the best known performance in conventional protocols (O(logK) throughput
with O(K) total transmit power). With bursty arrivals, we show that both the
stability region and average delay of the proposed OBDWF protocol can achieve
order-wise performance gain O(K) compared with conventional DDF protocol.
