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In this paper, the authors propose a Location-Aware Relay Selection (LARS) scheme based on geographical information in the distributed Opportunistic Relay (OR) communication system. The scheme aims to limit the contention among potential relays through dividing the whole relay selection region into some small non-overlapping contending torus zones. If a relay lies in the specified contending zone and its local channels are better than the source-destination channel, it becomes a contending relay and will transmit a FLAG packet to signal the presence when its own timer expires. If no relay is selected in the previous contending zone, the current contending torus zone will be extended. The contention is an iterative course until the relay selection process completes.
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