Implementation method for ACT-MAC (Asynchronous Concurrent Transmission MAC) protocol for intensive wireless sensor

Abstract

The invention discloses an implementation method for an ACT-MAC (Asynchronous Concurrent Transmission MAC) protocol for an intensive wireless sensor. The method comprises the following steps of adopting an asynchronous communication mechanism which is initiated based on a receiver while utilizing a dynamic prediction awakening mechanism on a sender to reduce the idle listening time of the receiver and the sender and the occupied time of the sender about a channel in a communication process; adopting a multi-channel dynamic switching mechanism to shunt the network load to realize simultaneous transmission of data at different nodes and eliminate the transmission delay and the power consumption increase which are caused by a hidden terminal; and adopting a constructive interference technology to realize concurrent transmission of the same data packet and effectively broadcasting the data in an intensive network in a multi-hop way. The ACT-MAC protocol for the intensive wireless sensor, which is provided by the invention, is not only suitable for a burst traffic load scene but also for a low traffic load scene.

Description

technical field [0001] The invention discloses an implementation method of the dense wireless sensor ACT-MAC (Asynchronous Concurrent Transmission MAC) protocol. It belongs to the MAC protocol design in the field of wireless communication technology, and realizes the multi-hop broadcast transmission of dense sensor network data. Background technique [0002] The wireless sensor network is a self-organizing network system formed by a large number of micro sensor nodes deployed in the monitoring area through short-distance wireless communication. Collectors converge to the data center. As a software technology, the wireless sensor network protocol cooperates with the hardware technology to support the wireless sensor network. The wireless sensor network protocol stack adopts a layered structure, in which the MAC protocol is responsible for channel access, message transmission of control nodes, and more effective, orderly and fair use of shared media through a set of rules an...

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Problems solved by technology

[0004] In a dense sensor network, when the node density increases, the number of nodes awakened in the same time period will increase greatly, which will cause a large number of conflicts between request frames, data frames, and response frames, resulting in channel saturation; based on the way the receiver initiates, the sender needs to deal with With the increase of data, the idle listening time is also extended accordingly, resulting in a huge increase in the power consumption of the sending node; at the same time, the increase in the number of communication nodes also makes the problem of hidden terminals in the network more prominent, resulting in a decrease in network data delay and power consumption performance; due to The number of nodes participating in forwarding increases, and the data collision caused by the exposed terminal problem is more serious. However, existing protocols mostly use conflict avoidance to resolve conflicts. The limitations of backoff and retransmission mechanisms make it difficult for existing asynchronous MAC protocols to efficiently support dense WSNs. Commonly used multi-hop broadcast applications in

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