End-to-end delay upper bound assessment method based on retransmission feedback for wireless sensor network

Abstract

The invention relates to an end-to-end delay upper bound assessment method based on retransmission feedback for a wireless sensor network, and belongs to the technical field of wireless sensor networks. The method comprises the following steps: S1, determining a composition form of sensor data streams and a transmission process of the sensor data streams in a network; S2, building a data stream retransmission feedback model according to network link quality, and analyzing the service capability of the network specific to all the data streams; S3, performing priority scheduling on original data streams and retransmitted data streams, and determining a service bandwidth allocated to the original data streams; S4, analyzing delay composition of sensor input data streams in an entire end-to-end network system to obtain components of fixed delay and variable delay; S5, calculating network end-to-end variable delay caused by the network service capability; and S6, acquiring the delay upper bound of an end-to-end network of data streams to be analyzed. Through adoption of the method, the timeliness of industrial wireless communications is ensured; quantitative analysis can be performed on network end-to-end communication delay at the beginning of network construction; and control of the timeliness of the industrial wireless communications is facilitated.

Description

technical field [0001] The invention belongs to the technical field of wireless sensor networks, and relates to a method for evaluating the upper bound of end-to-end time delay of wireless sensor networks based on retransmission feedback. Background technique [0002] In recent years, wireless sensor network (WSN) technology has developed rapidly and has been widely used in various aspects such as military applications, natural environment monitoring, industrial production monitoring, medical care and smart home, and is one of the current research hotspots. However, due to the influence of the environment, the wireless link of the wireless sensor network is relatively unstable, and the wireless link usually needs to transmit data in a multi-hop manner, and because a large number of wireless sensor network applications need to provide real-time guaranteed services, the wireless sensor network The research on the end-to-end delay upper bound has become one of the key issues. ...

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Problems solved by technology

[0004] However, there are still the following problems in the study of deterministic delay in wireless sensor networks: (1) when analyzing the minimum service capability of the network, the impact of the retransmission mechanism on the effective service capability of the network is not considered; (2) when allocating network bandwidth resources, it is relatively Less consideration should be given to the relationship between the data stream input rate of the acquisition terminal and the network service capability

(3) At present, the model established for wireless sensor network calculation is relatively simple, which does not take into account the feedback effect of packet loss and retransmission on the network caused by network link quality, and the delay caused by competition between retransmitted data streams and original data streams. a concrete analysis model

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