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Cross-layer routing and rate control strategies for datagram-based wireless multi-hop CSMA/CA networks

We investigate multi-hop wireless ad hoc networks in which nodes use 802.11-based MAC and PHY. Each node independently selects its cross-layer parameter vector for each packet that it forwards. The latter consists of the setting of the transmission data rate and the identification of the neighboring node to which the packet is forwarded (and thus the selection of the route). We present an analytical model to calculate, for each candidate parameter vector, the corresponding attainable throughput and transport throughput capacity rates. To enable the network to transport traffic in a throughput-effective manner, we present cross-layer schemes under which each node configures its parameter vector by using the corresponding link transport capacity measure as a key metric. We present two such datagram-based cross-layer parameter vector selection schemes. We compare the throughput performance behavior attained through these schemes, as well as with that of schemes that do not use the link transport capacity as a metric. Our results confirm the precision of our analysis and demonstrate the distinct effectiveness of schemes that employ the link transport capacity measure.