A transmission control scheme for media access in sensor networks
Proceedings of the 7th annual international conference on Mobile computing and networking
Versatile low power media access for wireless sensor networks
SenSys '04 Proceedings of the 2nd international conference on Embedded networked sensor systems
WiseMAC: an ultra low power MAC protocol for the downlink of infrastructure wireless sensor networks
ISCC '04 Proceedings of the Ninth International Symposium on Computers and Communications 2004 Volume 2 (ISCC"04) - Volume 02
X-MAC: a short preamble MAC protocol for duty-cycled wireless sensor networks
Proceedings of the 4th international conference on Embedded networked sensor systems
Ultra-low duty cycle MAC with scheduled channel polling
Proceedings of the 4th international conference on Embedded networked sensor systems
Medium access control in wireless sensor networks
Computer Networks: The International Journal of Computer and Telecommunications Networking
Adaptive Low Power Listening for Wireless Sensor Networks
IEEE Transactions on Mobile Computing
Z-MAC: a hybrid MAC for wireless sensor networks
IEEE/ACM Transactions on Networking (TON)
Proceedings of the 6th ACM conference on Embedded network sensor systems
A Novel MAC Protocol for Event-Based Wireless Sensor Networks: Improving the Collective QoS
WWIC 2009 Proceedings of the 7th International Conference on Wired/Wireless Internet Communications
A low power listening MAC with scheduled wake up after transmissions for WSNs
IEEE Communications Letters
Mobile Networks and Applications
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The hidden terminal problem is a well-known problem in wireless networks that degrades the network performance due to collisions between nodes unable to sense each other. Preamble sampling WSNs are more sensitive to that problem than wireless local area networks due to the high vulnerability time caused by the long preamble transmission. This is specially important when the traffic load is high, for instance due to event detection and query dissemination or in regions closer to the sink. Typical mechanisms to reduce the negative effects of hidden terminals, like the use of RTS/CTS messages, cannot alleviate the problem in preamble sampling WSNs as the long preamble is still needed, thus not reducing the high vulnerability time. To alleviate the hidden terminal problem in this kind of networks the LWT-MAC, a new preamble sampling MAC protocol, is presented. The LWT-MAC protocol adapts to the sporadic increases in the network load by waking up sensor nodes at the end of a transmission. At the same time, it reduces the channel contention by implementing a non-aggressive retransmission procedure. In this work, the ability of the LWT-MAC protocol to reduce hidden terminal problems is evaluated and compared to the basic preamble sampling technique. Results show that the LWT-MAC protocol is able to significantly lighten the hidden terminal problem, thus improving the overall system performance.