WUWNet '06 Proceedings of the 1st ACM international workshop on Underwater networks
A MAC protocol for ad-hoc underwater acoustic sensor networks
WUWNet '06 Proceedings of the 1st ACM international workshop on Underwater networks
Proceedings of the 12th annual international conference on Mobile computing and networking
Managing delay and jitter in mesh networks through path-aware distributed transmission scheduling
ACM SIGMOBILE Mobile Computing and Communications Review
Distributed CDMA-based MAC Protocol for Underwater Sensor Networks
LCN '07 Proceedings of the 32nd IEEE Conference on Local Computer Networks
A CDMA-based medium access control for underwater acoustic sensor networks
IEEE Transactions on Wireless Communications
ROSS: receiver oriented sleep scheduling for underwater sensor networks
Proceedings of the Eighth ACM International Conference on Underwater Networks and Systems
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Time-based medium access control (MAC) has potential advantages over FDMA and CDMA approaches in terms of hardware simplicity, energy efficiency, and delay. Unfortunately, the channel utilization of existing TDMA and CSMA acoustic MAC protocols is generally low due to the long propagation delays of acoustic signals. In this work, we argue that several ideas taken from RF protocols, including exclusive channel access, are either unnecessary in acoustic networks or must be redefined. We present and evaluate UW-FLASHR, a time-based MAC protocol which does not require centralized control, tight clock synchronization, or accurate propagation delay estimation. We demonstrate that UW-FLASHR can achieve significantly higher channel utilization than the maximum utilization possible with existing time-based exclusive access MAC protocols, particularly when the ratio of propagation delay to transmission delay is high or data payloads are small.