Wireless sensor networks for habitat monitoring
WSNA '02 Proceedings of the 1st ACM international workshop on Wireless sensor networks and applications
Timing-sync protocol for sensor networks
Proceedings of the 1st international conference on Embedded networked sensor systems
Versatile low power media access for wireless sensor networks
SenSys '04 Proceedings of the 2nd international conference on Embedded networked sensor systems
Simulating the power consumption of large-scale sensor network applications
SenSys '04 Proceedings of the 2nd international conference on Embedded networked sensor systems
Countersniper system for urban warfare
ACM Transactions on Sensor Networks (TOSN)
Ultra-low duty cycle MAC with scheduled channel polling
Proceedings of the 4th international conference on Embedded networked sensor systems
Collaborative in-network processing for target tracking
EURASIP Journal on Applied Signal Processing
DW-MAC: a low latency, energy efficient demand-wakeup MAC protocol for wireless sensor networks
Proceedings of the 9th ACM international symposium on Mobile ad hoc networking and computing
Proceedings of the 6th ACM conference on Embedded network sensor systems
Proceedings of the 8th ACM Conference on Embedded Networked Sensor Systems
| Hi-index | 0.00 |
The MAC protocol in wireless sensor networks (WSNs) plays an important role in conserving energy and it generally adopts a duty cycling mechanism to eliminate idle listing energy at the cost of high delivery latency. The most effective method of bypassing the latency disadvantage is forwarding a packet over multiple hops in an operational cycle. The combination of duty cycling and multi-hop forwarding creates a new class of MAC protocol called multi-hop MAC, which has been proven to outperform other single-hop duty cycling protocols both in term of energy efficiency and latency. A packet in such a protocol is always relayed via multiple hops toward a sink in a cycle. The flow from a source node to the sink is affected by contention because of the sharing characteristic of wireless channels. We investigated what effect contention had on the flow capacity of Demand Wakeup MAC (DW-MAC), which is a state-of-the-art multi-hop MAC protocol. We also found that instead of using the original large contention window (CW), a DW-MAC's flow using a smaller CW could avoid unnecessary contention and use channels more efficiently. The analysis and resulting ns-2 simulation revealed that DW-MAC with the new values for CW achieves higher throughput, lower end-to-end latency, and greater energy efficiency.