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The back-pressure algorithm is a well-known throughput-optimal algorithm.However, its delay performance may be quite poor even when the traffic load isnot close to network capacity due to the following two reasons. First, eachnode has to maintain a separate queue for each commodity in the network, andonly one queue is served at a time. Second, the back-pressure routing algorithmmay route some packets along very long routes. In this paper, we presentsolutions to address both of the above issues, and hence, improve the delayperformance of the back-pressure algorithm. One of the suggested solutions alsodecreases the complexity of the queueing data structures to be maintained ateach node.

Novel Architectures and Algorithms for Delay Reduction in Back-pressure Scheduling and Routing