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Distinct from the existing rate-reliability results, a novel multipath transmission scheme is proposed to enhance the rate-delay performance in multihop networks by employing network coding at the source. This scheme provides new rate-delay tradeoffs with fine granularity for rate maximization and is adaptive to Quality-of-Service (QoS) requirements. With the increasing demand on real-time communications, stringent Quality-of-Service (QoS) requirements have been imposed on end-to-end transmissions for reliable networking operations, especially for wireless networks with scarce and limited spectrum resources. Multipath transmissions are exploited to meet the QoS requirements by introducing redundancy over disjoint paths (i.e, paths do not share congestion nodes or bottlenecks), such as diverse routing in wired networks, coordinated multipoint transmissions in cellular systems, and multipath routing in cognitive radio networks.
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