Channel access method based on intelligent time slot selection

Abstract

The invention discloses a channel access method and apparatus based on intelligent time slot selection. The problem that the dynamic topology of the network in a wireless sensor network and the efficient utilization of a channel cannot exist at the same time is mainly solved. The method comprises the following steps: establishing a model of the wireless sensor network, and combining a wireless sensor network environment with a reinforcement learning method; determining a customized frame structure and the number of time slots; initializing a state value vector V(s) and a time slot selection probability Pi; selecting a time slot according to the time slot selection probability Pi for transmission, and updating a reward value of each time slot according to the feedback condition of the channel access; then updating a state value v of the corresponding time slot and a qualification trace delta according to the reward of each node; after the update is completed, evaluating the state of each node, when Vi is greater than Vth, deeming that the node is in a stable state at the ith time slot, finally adjusting a temperature factor parameter of a Boltzmann strategy according to the above state evaluation state and the state value, and selecting an optimal time slot of the node for sending. By adoption of the channel access method and apparatus disclosed by the embodiment of the invention, the channel utilization rate of the wireless sensor network is not only ensured, the reliability of the wireless sensor network is also improved, and the application value is wide.

Description

technical field [0001] The invention belongs to the technical field of wireless sensor networks, in particular to a channel access method based on intelligent time slot selection. Background technique [0002] In recent years, wireless sensor network has become one of the research hotspots in the current information field, which can be used in special environments to realize signal collection, processing and transmission. As a new information acquisition and processing technology, wireless sensor network has been more and more widely used in real life due to its small scale and low energy consumption. [0003] At present, there are two main channel access methods adopted by the MAC (Medium Access Control) layer protocol in wireless sensor networks: one is CSMA / CA (Carrier Sense Multiple Access with Collision Avoidance, carrier sense multiple access / collision avoidance). Avoidance) mechanism, one is TDMA (Time Division Multiple Access, Time Division Multiple Access) mechanis...

AI Technical Summary

Problems solved by technology

It is mainly used in scenarios where control nodes schedule other nodes. This mechanism requires strict time synchronization, so a large amount of interactive information is required between nodes. Since the superframe information and time slot information included in the beacon frame are fixed Unchanged, so there is no processing capacity for burst time, and the dynamic topology is poor

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