Grouping Strategy for Solving Hidden Node Problem in IEEE 802.15.4 LR-WPAN
WICON '05 Proceedings of the First International Conference on Wireless Internet
Performance Degradation of IEEE 802.15.4 Slotted CSMA/CA due to Hidden Nodes
LCN '07 Proceedings of the 32nd IEEE Conference on Local Computer Networks
An Adaptive GTS Allocation Scheme for IEEE 802.15.4
IEEE Transactions on Parallel and Distributed Systems
Adaptive Storage Policy Switching for Wireless Sensor Networks
Wireless Personal Communications: An International Journal
Wireless Personal Communications: An International Journal
An Adaptive Beacon Scheduling Mechanism Using Power Control in Cluster-Tree WPANs
Wireless Personal Communications: An International Journal
An accurate and scalable analytical model for IEEE 802.15.4 slotted CSMA/CA networks
IEEE Transactions on Wireless Communications
Transdisciplinarity of Smart Health Care: Transmedical E-volution
Wireless Personal Communications: An International Journal
A Study on Greenhouse Automatic Control System Based on Wireless Sensor Network
Wireless Personal Communications: An International Journal
Performance analysis of the IEEE 802.11 distributed coordination function
IEEE Journal on Selected Areas in Communications
Performance Evaluation of IEEE 802.15.4 CSMA/CA Scheme Adopting a Modified LIB Model
Wireless Personal Communications: An International Journal
Performance Analysis of IEEE 802.15.4 MAC Protocol with ACK Frame Transmission
Wireless Personal Communications: An International Journal
Wireless USB Cluster Tree based on Distributed Reservation Protocol for Mobility Support
Wireless Personal Communications: An International Journal
Wireless Personal Communications: An International Journal
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The release of IEEE 802.15.4 medium access control (MAC) and physical layer specifications represents a significant milestone in promoting deployment of wireless sensor networks. This paper first analyzes the performance of the contention access period (CAP) specified in the IEEE 802.15.4 standard by integrating the discrete-time Markov chain models of the node states and the channel states. Then a modified CAP is analyzed, which could significantly improve the performance of the system. Based on the theoretical analysis of the CAP and the effect of the modification, we have that in the saturated network of IEEE 802.15.4, the collision probability is large, and the throughput is small. The main reasons are the employment of slotted carrier sense multiple access-collision avoidance and the mechanism that if a frame transmission cannot be completed before the end of the CAP, it has to wait until the start of the next CAP. Thus an enhanced collision-avoidance MAC protocol, which achieves a better performance and is compatible with the IEEE 802.15.4 standard, is proposed to improve the performance of the system. Extensive simulations validate our conclusions.