Superframe-based low-energy-consumption media access control method in wireless body area network

Abstract

The invention discloses a superframe-based low-energy-consumption media access control method in a wireless body area network, mainly solving the problems of high energy consumption and failure in adaption to data heterogeneity of a competitive mechanism of the current protocol in the wireless body area network. The superframe-based low-energy-consumption media access control method comprises the steps of: dividing a superframe into three stages: a WBAN (Wireless Body Area Network) intranet data period, a period of communication between an individual terminal and a public network, and a WBAN reserved alarm period; setting three priority levels including high priority, secondary-high priority and common priority for each node by a coordinator node by means of monitoring abnormal data and calculating cache and time delay of each sensor node in the intranet data period; and allocating different time slot lengths and sequences according to three priorities. Under the condition that that cache and time delay meet the condition that, time delay is fully utilized, and the characteristic of the data heterogeneity in the wireless body area network is better adapted. Due to synchronism of data, without data interaction, all sensor nodes can judge whether to enter into a sleep mode or not just according to the local cache and the emission rate, thus reducing communication loss.

Description

technical field [0001] The invention belongs to the technical field of communications, and relates to a method for media access control, in particular to a method for media access control that can be used in a wireless body area network. Use time slots. Background technique [0002] Wireless Body Area Network (WBAN, Wireless Body Area Network) is a branch of Wireless Sensor Network (WSN, Wireless Sensor Network). It is a communication network composed of various nodes and personal terminals distributed on the surface of the human body and inside the body. It is not only a new solution for pervasive healthcare, disease monitoring and prevention, but also an important perception and component of the Internet of Things. [0003] A typical application of WBAN is in remote medical monitoring. Through the sensor nodes around the human body, the physical signs (ECG, blood pressure, body temperature, blood sugar, etc.) of the human body can be synchronized to the personal termina...

AI Technical Summary

Problems solved by technology

[0005] The wireless body area network mainly has the following characteristics: First, because the sensor nodes are wearable or implantable biosensors, the volume of the WBAN nodes is very high, which limits the energy and energy of the sensor nodes. cache

Second, the communication distance is short and the network topology is relatively fixed

Third, due to the heterogeneity of sensor nodes, the data rate difference between different sensors is large

However, the solution still uses the IEEE802.15.4 superframe structure, and the competition mechanism introduces additional energy consumption

[0007] After searching, it was found that S.J.Marinkovic, E.M.Popovici, C.Spagnol, S.Faul, and W.P.Marnane, "Energy-Efficient Low Duty Cycle MAC Protocol for Wireless Body AreaNetworks," Ieee Transactions on Information Technology in Biomedicine, vol.13, pp.915-925, Nov 2009, proposed a full TDMA structure, but this structure cannot guarantee the utilization of time slots

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