Integration of QoS and congestion control in multi-hop wireless networks

The layered protocol architecture lacks of flexibility to support granular QoS requirements for multi-hop mobile wireless networks with limited bandwidth. Meanwhile, research indicates that TCP behaves inefficiently in such networks. Recently Differentiated Queueing Service (DQS) and Semi-TCP schemes have been proposed to provide granular QoS and improve the performance of TCP, respectively. However, the impact of their correlation on the overall network performance has not been investigated when they are implemented in the same protocol stack since their implementations cross transport layer, network layer and data link layer. To this end, this paper integrates DQS and Semi-TCP to investigate the performance in multi-hop mobile wireless networks. The study comes up with some new possible schemes to further improve the overall performance. According to our study, we propose a new algorithm to estimate the latest departure time and a novel handling of overdue packets, as well as an ACK scheme to decrease nodes' contention. Furthermore, we also design the cross-layer architecture for the integrated solution. Simulation results show that the integrated scheme can further improve throughput and reduce delay.

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