Delay-Optimal Back-Pressure Routing Algorithm for Multihop Wireless Networks

Although the back-pressure (BP) algorithm has been proven to be a throughput-optimal policy for traffic scheduling and routing in wireless networks, the optimal control of delays in the BP algorithm remains an open problem, especially for conventional multihop networks. To enhance the delay performa...

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Vydáno v:	IEEE transactions on vehicular technology Ročník 67; číslo 3; s. 2617 - 2630
Hlavní autoři:	Hai, Long, Gao, Qinghua, Wang, Jie, Zhuang, He, Wang, Ping
Médium:	Journal Article
Jazyk:	angličtina
Vydáno:	New York IEEE 01.03.2018 The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Témata:	Algorithms Back-pressure algorithm Computer simulation Delay delay optimal control Delays Heuristic algorithms Knowledge management Markov analysis multi-hop networks Optimal control Optimization Queues Routing Spread spectrum communication Stability analysis Throughput Traffic delay Wireless networks
ISSN:	0018-9545, 1939-9359
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Abstract	Although the back-pressure (BP) algorithm has been proven to be a throughput-optimal policy for traffic scheduling and routing in wireless networks, the optimal control of delays in the BP algorithm remains an open problem, especially for conventional multihop networks. To enhance the delay performance, we proposed an improved BP algorithm called sojourn-time-based BP (STBP) by introducing a novel delay metric called the sojourn time backlog (STB). The STB considers the queue length and accumulated packet delays comprehensively. It provides more pressure to push forward flows suffering from greater delays. Based on this new metric, the calculation of the routing weight for each packet is determined for maximizing the difference of the STB in the routing process. The proposed routing algorithm is robust and distributed, and does not require any prior knowledge of network connections and load conditions. We analyze the network stability with delay considerations and prove the throughput optimality of the STBP in multihop networks. Simulation results reveal that the enhanced algorithm effectively improves the end-to-end delay while ensuring throughput optimality.
AbstractList	Although the back-pressure (BP) algorithm has been proven to be a throughput-optimal policy for traffic scheduling and routing in wireless networks, the optimal control of delays in the BP algorithm remains an open problem, especially for conventional multihop networks. To enhance the delay performance, we proposed an improved BP algorithm called sojourn-time-based BP (STBP) by introducing a novel delay metric called the sojourn time backlog (STB). The STB considers the queue length and accumulated packet delays comprehensively. It provides more pressure to push forward flows suffering from greater delays. Based on this new metric, the calculation of the routing weight for each packet is determined for maximizing the difference of the STB in the routing process. The proposed routing algorithm is robust and distributed, and does not require any prior knowledge of network connections and load conditions. We analyze the network stability with delay considerations and prove the throughput optimality of the STBP in multihop networks. Simulation results reveal that the enhanced algorithm effectively improves the end-to-end delay while ensuring throughput optimality.
Author	Hai, Long Gao, Qinghua Zhuang, He Wang, Ping Wang, Jie
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SubjectTerms	Algorithms Back-pressure algorithm Computer simulation Delay delay optimal control Delays Heuristic algorithms Knowledge management Markov analysis multi-hop networks Optimal control Optimization Queues Routing Spread spectrum communication Stability analysis Throughput Traffic delay Wireless networks
Title	Delay-Optimal Back-Pressure Routing Algorithm for Multihop Wireless Networks
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