Media access control protocol for radio physiological information sensor network

Abstract

A media access control protocol of radio physiological information transducer network is featured as making each measurement node carry out one for one communication with central node in sequence after each measurement node is initialized and making the other measurement node be on sleep state with low power consumption when data is emitted to central node by a measurement node and confirmation signal of data-received is emitted to said measurement node by central node.

Description

technical field [0001] The invention relates to a media access control protocol in network communication, in particular to a media access control protocol in a wireless physiological information sensor network for monitoring various physiological information of patients. Background technique [0002] The wireless physiological information sensor network is mainly used to monitor various physiological information of patients and send them to the medical center through the long-distance wireless communication network. It includes multiple measurement nodes and a central node, each part of which is worn on the patient, and each measurement node detects the patient's body temperature, ECG, blood pressure, respiration and other physiological information, and sends them wirelessly to the central node. Points are sent to the medical center after being processed by the central node, and the central node also distributes the commands sent by the medical center to each node. Compared...

AI Technical Summary

Problems solved by technology

[0010] (2) Collision (collision): When two nodes in the network access the same channel at the same time, they will interfere with each other and cause the data packets to be destroyed, so that these data packets can only be resent, and these nodes are consumed in sending and receiving data. energy is wasted

[0011] (3) Eavesdropping (overhearing): When using a shared channel for communication, a node may receive data that is not in the channel assigned to it. These data are meaningless to this node, so the energy consumed in receiving data wasted

[0012] (4) Control packet overhead: The MAC layer protocol header and control message packets do not contain valid data and are only used to exchange control information between nodes. The exchange of these information will also consume energy

[0014] These two types of MAC layer protocols have their own characteristics. The TDMA and FDMA methods in the former are suitable for networks with little change in network topology. Although CDMA can adapt to changes in network topology, the complex structure makes it suitable for use in wireless sensor nodes. The application is limited; the latter has better scalability and adaptability, because it assumes that the network traffic generated by the nodes is random, intermittent and bursty, so it is suitable for situations where there are many sensor nodes and large changes, However, since multiple nodes will compete for the channel at the same time, causing collisions and retransmissions, more energy will be wasted