Proceedings of the 5th ACM international symposium on Mobile ad hoc networking and computing
Proceedings of the 10th annual international conference on Mobile computing and networking
Starvation mitigation through multi-channel coordination in CSMA multi-hop wireless networks
Proceedings of the 7th ACM international symposium on Mobile ad hoc networking and computing
Practical synchronization techniques for multi-channel MAC
Proceedings of the 12th annual international conference on Mobile computing and networking
Analyzing DISH for multi-channel MAC protocols in wireless networks
Proceedings of the 9th ACM international symposium on Mobile ad hoc networking and computing
Cognitive DISH: virtual spectrum sensing meets cooperation
SECON'09 Proceedings of the 6th Annual IEEE communications society conference on Sensor, Mesh and Ad Hoc Communications and Networks
RCO: a multi-channel MAC protocol with random cooperation for sensor networks
UIC'10 Proceedings of the 7th international conference on Ubiquitous intelligence and computing
Can cooperation improve energy efficiency in ad hoc wireless networks?
Computer Communications
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Recently, a new notion of cooperation was proposed to solve multi-channel coordination problems. When a transmit-receive pair wishes to initiate communication, neighboring nodes share their knowledge of channel usage. This helps to substantially reduce collisions and increases throughput significantly. However, it comes at the cost of increased energy consumption since idle nodes have to stay awake to overhear and acquire channel usage information. In fact this can be as high as 264% of a power-saving protocol without cooperation. In this paper, we propose a strategy called altruistic cooperation for cooperative multi-channel MAC protocols to conserve energy. The core idea is to introduce specialized nodes called altruists in the network whose only role is to acquire and share channel usage information. All other nodes, termed peers, go in to the sleep mode when idle. This strategy seems naive because it needs additional nodes to be deployed. In fact, it is unclear whether a desirable throughput-energy trade-off can be achieved and whether the cost of additional nodes can offset the performance gain. We perform a close study on this strategy in terms of three aspects: network deployment, cost efficiency, and system performance. Our study indicates that only a few additional nodes need to be deployed and cost efficiency is more than doubled in terms of a new metric called bit-price ratio that we propose. By using the strategy, a cooperative protocol is found to save up to 70% energy while not compromising throughput.