Channel access control method for wireless sensor network

Abstract

The invention discloses a method for controlling channel access of a wireless sensor network. A base station node and each sensor node adopt a time frame structure with different lengths of time frame, so that the sensor nodes can reserve different time slots by dispatching to carry out data packet transmission, thereby not only reducing collision probability of forwarding data packets among sensor nodes in a high-density monitoring area and improving the utilization rate of wireless channel, but also effectively avoiding overhearing in the wireless sensor network and frequent status switching of a transceiver; therefore, the sensor nodes can be in dormancy status as fully as possible during idle transmission so as to greatly reduce energy consumption under the high-loading network condition and have good energy efficiency. A path reserve mechanism can reserve a multi-hop time slot in advance along data packet forwarding direction in time slot reservation phase, according to the time frame synchronizing characteristics of the sensor nodes on a forwarding path, thereby effectively avoiding end-to-end transmission delay of single data packet caused by intermittent transmission of data packets on the forwarding path.

Description

technical field [0001] The invention relates to a wireless sensor network technology, in particular to a channel access control method of the wireless sensor network. Background technique [0002] Wireless sensor network is an emerging technology, which can be widely used in environmental monitoring, intelligent space, medical system and robot development and other fields. In wireless sensor networks, MAC (Medium Access Control) protocol is one of the key network protocols to determine the use of wireless channels, allocate limited communication resources between sensor nodes and ensure efficient communication in wireless sensor networks. Due to the limitation of cost and volume, sensor nodes are usually powered by batteries with limited energy. However, when the power supply batteries of sensor nodes are exhausted, due to the large number of sensor nodes in wireless sensor networks, sensor nodes are usually randomly deployed in the monitoring area. , and the working enviro...

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Problems solved by technology

However, the TRAMA protocol has a large data delay, frequent and complex calculations, and requires very precise clock synchronization

[0006] In addition, most of the existing MAC protocols are only suitable for traditional wireless sensor networks with a single application and low network load, which cannot meet the requirements of supporting multiple applications such as the integration of multiple data collection and event monitoring, etc., and require the ability to support large data traffic A wireless sensor network capable of providing low-latency services

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