Asynchronous wireless sensor network MAC protocol started at sending terminal

Abstract

The invention discloses an asynchronous wireless sensor network MAC protocol started at a sending terminal. The asynchronous wireless sensor network MAC protocol adopts a leading short frame technique, and comprises the following steps: when a sensor node in the network sends data, a channel clearing access mechanism is adopted to confirm whether a channel is idle or not; a certain amount of leading short frames (UF frames) are sent after the channel is confirmed to have no communication task; the channel is monitored periodically by each neighbor node which is in a working condition; after a first UF frame serving as an own goal node is detected, a confirming frame is sent to the sending terminal, and the goal node accesses a receiving condition and waits for receiving data; the sending terminal adopts an 'interval leading' mechanism to wait for the confirming frame at a sending interval of every two UF frames, stops sending UF frames as soon as the confirming frame is received, and accesses a data sending condition. According to the invention, characteristics of the wireless sensor network are fully matched; network energy consumption, network collision, and network delay can be effectively reduced.

Description

technical field [0001] The invention relates to an asynchronous wireless sensor network MAC protocol initiated by a sending end. Background technique [0002] In recent years, wireless sensor network (WSN) has attracted extensive attention from academia and industry due to its broad application prospects. It is one of the most important technologies in the 21st century. In the deployment of wireless sensor networks, when the number of network nodes increases, network collisions are likely to occur; in addition, the communication energy consumption in the network affects the battery life of wireless sensor networks, which is not conducive to the expansion of the network to more nodes. The Medium Access Control (MAC) protocol determines the use of wireless channels and is responsible for allocating limited communication resources between sensor nodes. It has a great impact on the performance of sensor networks and is the key to ensuring efficient communication in wireless sens...

AI Technical Summary

Problems solved by technology

However, there are many problems in the actual application of the traditional MAC protocol activated by the sender, such as: 1. For the low-energy interception mechanism adopted by it, the receiver needs to wait for the sender to send the entire preamble signal before receiving data. It causes a lot of energy consumption to both the sender and the receiver; 2. The sender sends the leading signal without a target node, causing the non-target node to receive and process the data, resulting in crosstalk; 3. The time of the leading signal is fixed, causing unnecessary necessary communication delay

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