Dynamic Backpressure is a highly desirable family of routing protocols known for their attractive mathematical proprieties. However, these protocols suffer from a high end-to-end delay making them inefficient for real-time traffic with strict endto-end delay requirements. In this paper, we address this issue by proposing a new adjustable and fully distributed Backpressurebased scheme with low queue management complexity, named LifeTime-Aware BackPressure (LTA-BP). The novelty in the proposed scheme consists in introducing the urgency level as a new metric for service differentiation among the competing traffic flows in the network. Our scheme not just significantly improves the quality of service provided for real-time traffic with stringent end-to-end delay constraints, but interestingly protects also the flows with softer delay requirements from being totally starved. The proposed scheme has been evaluated and compared against other state of the art routing protocol, using computer simulation, and the obtained results show its superiority in terms of the achieved end-to-end delay and throughput.
Abstract-This paper analyzes the significant low performance of Backpressure routing protocols when combined with TCPbased flows. The issue is due to a mismatch between i) the congestion control mechanism of TCP and ii) the multi-path nature based on queue backlogs differentiation of the Backpressure algorithms. We aim to address this issue by introducing and evaluating two novel schemes within the Lyapunov drift-pluspenalty framework, namely V-based differentiation and Queuingbased differentiation Backpressure. The proposed schemes allows maximizing link capacity utilization for each node by enhancing interaction between TCP congestion control and Backpressure. Ns-3 simulation experiments confirm the throughput efficiency of our proposed schemes.
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