A real-time scheduling method for multimedia sensor network

Abstract

The invention requests protection of a real-time scheduling method for a multimedia sensor network. The implementation steps include: specifying that the superframe is a short superframe, and dividing the data transmission phase assigned by the AP to each station (STA) in the beacon frame into a point coordination transmission period (PCTP) and a distributed coordination transmission period (DCTP). and Multimedia Data Acquisition Feedback Period (DAQFP). In the DAQFP stage, the STA applies to the AP for the required transmission time length (TXOPidemand) according to the amount of collected data. The AP allocates the total channel access time length of PCTP and DCTP in the superframe according to the global delay and global packet loss rate of the current multimedia sensor network. The AP allocates the actual TXOP according to the time delay of each STA, the size of the time delay jitter, and the requested transmission time length. Each STA calculates the Arbitration Frame Inter-Frame Space (AIFS) of the STA according to the number of retransmission packets and the number of retransmission times, and transmits the retransmission packets by occupying the channel access time through CSMA / CA. The invention improves the low utilization rate of the channel, improves the real-time performance of each STA, reduces the global network time delay, and distributes channel resources fairly.

Description

technical field [0001] The invention belongs to the technical field of network communication, and in particular relates to a real-time scheduling method for a wireless multimedia sensor network that guarantees global time delay. Background technique [0002] With the advancement of wireless communication technology and image and audio acquisition technology, the wireless multimedia monitoring industry has developed rapidly, playing an important role in security monitoring, traffic management, environmental monitoring, smart home and other fields. As an important part of the information collection source of the Internet of Things, wireless multimedia monitoring enriches the application of the Internet of Things and provides technical support for the multimedia sensor network. [0003] At present, the embedded monitoring system is mostly used for wireless multimedia monitoring. The image data transmission information is fed back through the monitoring terminal, and the image d...

AI Technical Summary

Problems solved by technology

[0005] In the process of wireless multimedia data transmission, due to the large fluctuations in the amount of multimedia data collected by each STA in the network, the channel utilization rate is low, the real-time performance of each STA is poor, the global network delay is deteriorated, and channel resource allocation is unfair. A wireless multimedia transmission scheduling method aimed at both characteristics of wireless communication technology and multimedia information collection technology, the technical solution of the present invention is as follows: a real-time scheduling method for a multimedia sensor network, which includes the following steps:

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