Self-adaptive low-delay media access control method in WBAN (wireless body area network)

Abstract

The invention discloses a self-adaptive low-delay media access control method in a WBAN (wireless body area network), mainly solving the problem that a GTS (guaranteed time slot) slot can not realize self-adaptive distribution and has long time delay for ensuring time slot service when IEEE (Institute of Electrical and Electronic Engineers) 802.15.4 is applied to the WBAN. The self-adaptive low-delay media access control method comprises the following realization steps: a coordinating point receives the GTS request of a common node in a competitive period, an inactive period is compressed to expand a non-competitive period, and the GTS time slot is dynamically distributed according to amount requested by GTS; the common node of the obtained GTS time slot finishes GTS service transmission with the coordinating point in the non-competitive period; the coordinating point broadcasts and sends a notification frame in a notification frame time slot after the non-competitive period to notifythe common node to expand the time slot distribution of the non-competitive period; and the common node of the obtained GTS time slot finishes GTS service transmission with the coordinating point in the expanding non-competitive period. Compared with the IEEE 802.15.4, the self-adaptive low-delay media access control method can be used to realize the self-adaptive distribution of the GTS time slot, lower the delay of GTS service grouping, reduce the energy consumption of the coordinating point and is suitable for the WBAN.

Description

technical field [0001] The invention belongs to the technical field of communication, and relates to a media access control method, in particular to a media access control method used in a wireless body area network. Reduce packet delay and reduce energy consumption. Background technique [0002] Wireless Body Area Network (WBAN, Wireless Body Area Network) is a wireless communication network that targets devices around the human body, such as portable sensors, watches, PDAs, and mobile phones, as well as implanted devices inside the human body. In the field of short-range wireless communication, although WPAN technology exists, the concept of body area network stipulates that the transmission distance of short-range wireless communication is shorter, and the distance is limited to the surroundings of the human body. Body area network technology has a wide range of applications, from physiological signal collection to human computing interaction, education, and entertainmen...

AI Technical Summary

Problems solved by technology

[0010] (1) In the IEEE 802.15.4 protocol, the maximum number of GTS allocated in a superframe is 7, and the length of the active period and the inactive period in the current superframe are fixed. The disadvantage of this design is: if the current If there is no GTS service request in the superframe CAP period, the competition period occupies the entire activation period, and the coordination point cannot sleep in time, which increases energy consumption; and when there are a large number of GTS service requests in the superframe CAP period, the CFP period cannot accommodate a large number of them at the same time. GTS service, that is, in the IEEE 802.15.4 protocol, the dynamic allocation of GTS time slots cannot be used to achieve flexible support for GTS services

[0011] (2) During the implementation of the IEEE 802.15.4 protocol for sending data in GTS time slots, although the node's GTS request may have successfully competed in the CAP of the current superframe, because the GTS time slot allocation information needs to be sent in the next superframe Broadcasting is performed in the beacon, so in the CFP period of the current superframe, the node cannot transmit the packet in time, but must wait until the CFP period of the next superframe to transmit, which undoubtedly increases the delay of the GTS packet

Images