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The impact of relaying on the latency of communication in a relay channel isstudied. Both decode-forward (DF) and amplify-forward (AF) are considered, andare compared with the point-to-point (P2P) scheme which does not use the relay.The question as to whether DF and AF can decrease the latency of communicatinga number of bits with a given reliability requirement is addressed. Latencyexpressions for the three schemes are derived. Although both DF and AF use ablock-transmission structure which sends the information over multipletransmission blocks, they can both achieve latencies lower that P2P. Conditionsunder which this occurs are obtained. Interestingly, these conditions are morestrict when compared to the conditions under which DF and AF achieve higherinformation-theoretic rates than P2P.

When Can a Relay Reduce End-to-End Communication Delay?