A deterministic scheduling method for industrial wireless networks considering link retransmission

An industrial wireless network and scheduling method technology, which is applied in the field of industrial wireless network communication to achieve the effects of satisfying deterministic requirements, realizing reliability and real-time, and alleviating the problem of packet loss

Active Publication Date: 2021-07-20
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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  • A deterministic scheduling method for industrial wireless networks considering link retransmission
  • A deterministic scheduling method for industrial wireless networks considering link retransmission
  • A deterministic scheduling method for industrial wireless networks 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 a deterministic scheduling method for industrial wireless networks considering link retransmission, and belongs to the technical field of industrial networks. The present invention faces the high reliability and high real-time requirements of industrial wireless network data transmission, aims at the packet loss problem in industrial wireless network, considers retransmission in the scheduling process, and proposes two strategies supporting continuous retransmission and intra-window retransmission respectively deterministic scheduling method. The proposed method is based on the link time slot margin and dynamic priority, by allocating communication resources for the retransmission link in each time slot according to the scheduling rules, alleviating the impact of packet loss on data transmission, and based on two retransmission strategies Corresponding time slots and channel resources are optimally allocated to ensure end-to-end data arrival on time. The scheduling method proposed by the present invention further improves the reliability of data transmission on the premise of satisfying the certainty of data transmission, and realizes an effective balance between real-time and reliable data transmission.

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...

Claims

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Application Information

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Patent Type & Authority Patents(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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