RAP: A Real-Time Communication Architecture for Large-Scale Wireless Sensor Networks
RTAS '02 Proceedings of the Eighth IEEE Real-Time and Embedded Technology and Applications Symposium (RTAS'02)
A MAC Protocol to Reduce Sensor Network Energy Consumption Using a Wakeup Radio
IEEE Transactions on Mobile Computing
A Contention Window Based Differentiation Mechanism for providing QoS in Wireless LANs
ICIT '06 Proceedings of the 9th International Conference on Information Technology
Analysis of the contention access period of IEEE 802.15.4 MAC
ACM Transactions on Sensor Networks (TOSN)
A survey on wireless multimedia sensor networks
Computer Networks: The International Journal of Computer and Telecommunications Networking
MacZ - A Quality-of-Service MAC Layer for Ad-hoc Networks
HIS '07 Proceedings of the 7th International Conference on Hybrid Intelligent Systems
Alert: An Adaptive Low-Latency Event-Driven MAC Protocol for Wireless Sensor Networks
IPSN '08 Proceedings of the 7th international conference on Information processing in sensor networks
Z-MAC: a hybrid MAC for wireless sensor networks
IEEE/ACM Transactions on Networking (TON)
Computer Networks: The International Journal of Computer and Telecommunications Networking
Energy and delay optimized contention for wireless sensor networks
Computer Networks: The International Journal of Computer and Telecommunications Networking
Priority-based QoS MAC protocol for wireless sensor networks
IPDPS '09 Proceedings of the 2009 IEEE International Symposium on Parallel&Distributed Processing
ER-MAC: A Hybrid MAC Protocol for Emergency Response Wireless Sensor Networks
SENSORCOMM '10 Proceedings of the 2010 Fourth International Conference on Sensor Technologies and Applications
Design and implementation of a QoS-aware MAC protocol for Wireless Multimedia Sensor Networks
Computer Communications
WWIC'05 Proceedings of the Third international conference on Wired/Wireless Internet Communications
Sift: a MAC protocol for event-driven wireless sensor networks
EWSN'06 Proceedings of the Third European conference on Wireless Sensor Networks
IEEE Transactions on Wireless Communications
IEEE Network: The Magazine of Global Internetworking
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Emerging multimedia applications for sensor networks require the co-existence of different types of traffic with different QoS provisions in terms of latency and throughput. Prioritization-based service differentiation mechanisms are applied in all layers of communication to satisfy the QoS requirements of each traffic class. The prioritization in the contention is one of these differentiation methods applied in the medium access layer. In this article, we propose an analytical model for the contention latencies and energy expenditures of different classes in a prioritized contention structure with uniform backoff scheme. The contention window is divided into three partitions which are allocated for the use of only high-priority, both priorities, and only low-priority classes. We further generalize the model for binary exponential backoff schemes and for more than two priority classes. In the analysis, we explore the optimum sizes of these partitions in terms of contention latency and the total energy expenditure for each priority class. Our model is also useful for the evaluation of various recent contention prioritization schemes in WSNs.