Mobility

A Cross-Layer Mechanism for Solving Hidden Device Problem in IEEE 802.15.4 Wireless Sensor Networks

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Executive Summary

IEEE 802.15.4 standard is designed to achieve low-power transmissions in low-rate and short-distance Wireless Personal Area Networks (WPANs). For the sake of reducing the control overheads, the modified CSMA/CA protocol used by 802.15.4 does not have the hidden device protection mechanism, such as RTS/CTS mechanism. Previous studies indicate that the probability of any two devices in a infrastructure network unheard of each other is around 41%. Therefore, the Hidden Device Problem (HDP) results in inefficient data transmission and serious power consumption issues in WPAN. In this paper, the authors propose a Cross-Layer Detection And Allocation (CL-DNA) scheme to solve the HDP in IEEE 802.15.4 without the cost of extra control overhead in data transmissions.

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