Real-time scheduling method for multimedia sensing network

Abstract

The invention claims a real-time scheduling method for a multimedia sensing network. The real-time scheduling method includes the implementing steps of: stipulating that superframes are short superframes, and dividing a data transmission phase allocated to each station (STA) by an AP in a beacon frame into a point coordination transmission phase (PCTP), a distributed coordination transmission phase (DCTP) and a multimedia data acquisition feedback phase (DAQFP). The STA applies for a transmission demand time length TXOPidemand with the AP in the DAQFP according to the size of acquired data volume. The AP allocates total channel access time length of the PCTP and the DCTP of the superframes according to the overall delay and overall packet loss probability of the current multimedia sensing network. The AP allocates the actual TXOP according to the delay, the size of delay variation and the applied transmission demand time length of each STA. Each STA calculates the arbitration interframe space (AIFS) of the corresponding STA according to the quantity of retransmission packets and retransmission times, and occupies the channel for the channel access time to transmit the retransmission packets in a manner of CSMA/CA. According to the real-time scheduling method for the multimedia sensing network, the low channel utilization is improved, the timeliness of each STA is enhanced, the overall network delay is reduced, and the channel resources are fairly allocated.

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.

Images