Information transmission method of wireless body area network
A wireless body area network and information transmission technology, applied in wireless communication, transmission systems, sensors, etc., can solve the problems of energy waste, affecting the accuracy of methods, and not considering the impact of wireless channels dynamically, so as to prolong the survival time and avoid Failure and retransmission, the effect of ensuring validity
Inactive Publication Date: 2013-04-10
SHANGHAI JIAOTONG UNIV
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However, this method needs to know the relative position information of each node through other methods, and does not dynamically consider the impact of human behavior on the wireless channel
When the posture of the human body changes, the change of the relative position information of the node may affect the accuracy of the method, and when the selected next-hop node is blocked by the human body, the node cannot communicate with it, and the failure and retransmission of information and the next The reselection of jump nodes will cause a waste of energy
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[0040] There are A in the wireless body area network of this embodiment 1 , A 2 ,...,A 7 Seven wireless sensor nodes are located on the neck, chest, left waist, right waist, left wrist, right wrist and back, of which: A 2 It is the central node of the wireless body area network, responsible for the communication between the entire wireless body area network and the external network, A 6 It is an ECG (electrocardiogram) node, which is responsible for measuring the ECG signal of the human body. Since the channel around the human body increases the signal attenuation significantly with the increase of the distance, the distance between the nodes is controlled within 40cm. Non-adjacent nodes can only communicate through multi-hop relay. Adjacent nodes can directly communicate with one-hop when they are not blocked by human body, but they can only communicate through multi-hop relay when they are blocked by human body. In this embodiment, the ECG node A 6 As an example to opera...
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The invention relates to an information transmission method of a wireless body area network in the technical field of wireless communication. The method comprises the following steps: a node A detecting a body to obtain a body physiological signal and diving the body physiological signal into a plurality of signal segments with length equal to signal period; sequentially conducting re-sampling processing, direct current offset elimination processing and amplitude conversion processing to the signal segments; conducting principal component analysis processing to the processed body physiological signal to obtain the current behavior information of the body; conducting judgment processing to the current behavior information of the body to obtain the next hop node candidate set of the node A;and selecting a node C closest to a target node B as a next hop node from the next hop node candidate set of the node A till the physiological information of the body is transmitted to the target node B. By adopting the method, the change of the body posture is monitored in real time, the nodes which cannot be used for communication are eliminated in advance before routing selection, the failed information transmission is avoided and the energy wastage caused by retransmission and the reselection of the next hop node is avoided.
Description
technical field [0001] The present invention relates to a method in the technical field of wireless communication, in particular to an information transmission method of a wireless body area network based on human behavior recognition technology. Background technique [0002] The wireless body area network (Body Area Network) is developed from the wireless sensor network (Wireless Sensor Network). A typical application of wireless body area network is in remote medical monitoring. The wireless sensor nodes attached to the surface of the human body form a network to detect the physiological information of the human body and transmit the interaction. Finally, the health status of the human body is remotely monitored by transmitting it to the medical center through the antenna. . The energy of the wireless sensor is very limited, and it is close to the surface of the human body, so the signal transmission power of the wireless channel, the data transmission bandwidth and other...
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IPC IPC(8): H04W84/18H04L29/08A61B5/11
Inventor 李阳刘伟冯晶凌王炜钱良
Owner SHANGHAI JIAOTONG UNIV