ABSTRACT
In IEEE 802.15.4 wireless personal area networks (WPANs), the reliable data transmission is one of important issues such as the body information for medical treatments. Some handshaking mechanisms in literatures were studied and proposed to guarantee successful frame transmission. One of handshaking mechanisms adopts ACK frame, which is replied by the receiver back to the sender when the data frame is correctly received. This is a popular mechanism. However, there are many different reasons causing data frames which cannot be correctly received on the receiver such as the fading channel, data frame collision and hidden terminal problem and so on. Therefore, a sender should have different data retransmission policies and procedures. Neglecting these reasons of failed transmission, the retransmission frame may fail again, and the transmission efficiency will be degraded. In this paper, we propose a cross-layer judgment scheme to solve the retransmission problem. It does not require the cost of extra control overhead, but it can judge correctly the reasons of failed transmission from overlapped signals. Thus, the sender can adjust adaptive system parameters to handle the retransmission procedure. Simulation results demonstrate that the proposed scheme can effectively improve the transmission efficiency.
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Index Terms
- A cross-layer judgment scheme for solving retransmission problem in IEEE 802.15.4 wireless sensor networks
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