An industrial wireless network deterministic scheduling method considering link retransmission

A technology of industrial wireless network and scheduling method, which is applied in the field of industrial wireless network communication, to achieve the effect of meeting certainty requirements, simple and effective scheduling method, and alleviating the problem of packet loss

Active Publication Date: 2019-05-21
CHONGQING UNIV OF POSTS & TELECOMM
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Problems solved by technology

The existing deterministic scheduling optimization methods for industrial wireless networks mainly focus on solving the problem of whether the scheduling is solvable and how to improve the scheduling success rate, but rarely consider the impact on packet retransmission in the scheduling process

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  • An industrial wireless network deterministic scheduling method considering link retransmission
  • An industrial wireless network deterministic scheduling method considering link retransmission
  • An industrial wireless network deterministic scheduling method considering link retransmission

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Embodiment Construction

[0040] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0041] figure 1 Described is the working process of a deterministic scheduling method for industrial wireless networks considering continuous retransmission. The method first obtains the parameters of the network to be scheduled, including the number of network nodes N, the transmission path, period and relative deadline of the data flow, the network superframe period T, and the number of available channels M in the network and the number of retransmissions K. Then, the method first schedules the retransmission link in each time slot, and calculates the link time slot margin for the released state link, and the calculation method is d k -t+1-C k . The smaller the link time slot margin, the higher the current urgency. The link should be scheduled first, and judge whether it meets the deadline requirement. For the retransmission link, it s...

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Abstract

The invention relates to an industrial wireless network deterministic scheduling method considering link retransmission, and belongs to the technical field of industrial networks. The invention aims at the high-reliability and high-real-time requirements of industrial wireless network data transmission, aims at the problem of packet loss in an industrial wireless network, considers retransmissionin the scheduling process, and provides a deterministic scheduling method supporting two strategies of continuous retransmission and intra-window retransmission respectively. The method is based on the link time slot margin and the dynamic priority, communication resources are distributed to a retransmission link in each time slot according to a scheduling rule, the influence of packet loss on data transmission is relieved, corresponding time slot and channel resource optimization distribution is carried out around two retransmission strategies, and end-to-end arrival of data is guaranteed. According to the scheduling method provided by the invention, on the premise that the data transmission certainty is met, the data transmission reliability is further improved, and effective balance between real-time data transmission and reliability is realized.

Description

technical field [0001] The invention belongs to the technical field of industrial wireless network communication, and relates to an industrial wireless network deterministic scheduling method considering link retransmission. Background technique [0002] Industrial wireless network is a wireless communication network used for information exchange between industrial field devices. It has the characteristics of self-organization, low power consumption, easy upgrade and deployment, etc. It has practical significance for improving the production efficiency and saving costs of industrial field. Periodic data in industrial wireless networks usually have high real-time, high reliability requirements, and deadline constraints, while industrial field network equipment has limited computing power and available communication resources, and there are many uncertain factors, so research on how to provide network It is of great significance to allocate time slots and channel resources rea...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W72/04H04W72/12
CPCH04W72/04H04W72/12Y02D30/70
Inventor 王恒刘清华李霄哲
Owner CHONGQING UNIV OF POSTS & TELECOMM
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