Medium access control method for prolonging network lifetime in wireless body area network
A technology of media access control and wireless body area network, which is applied in the field of communication, can solve the problems that the direct communication of transmission power is not necessarily feasible, the path loss is large, etc., and achieve the effect of prolonging the network survival time, quick response and improving the survival time
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[0037] Assuming that under normal communication conditions, all nodes and network coordination points use a superframe structure based on IEEE 802.15.4 star topology to communicate. The superframe structure is as follows figure 1 As shown; and assuming that all nodes in the network can measure their own residual energy value in real time, if a node i finds its measured residual energy value E i Below the energy threshold E specified by the network t , The node starts to request a relay from the network coordination point. In the present invention, the node is called a relay request node.
[0038] Reference figure 2 , The present invention includes three parts: relay request, relay selection and superframe adjustment. The specific steps are as follows:
[0039] 1. Relay request
[0040] Step 1: Relay request node requests relay
[0041] If the relay requesting node happens to have a frame interacting with the network coordination point, the node will pass such as image 3 The shown int...
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