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Optimization method for retransmission time slot allocation of single-channel multi-hop industrial wireless communication link

A technology for industrial wireless communication and time slot allocation, which is applied in wireless communication, error prevention/detection using return channels, electrical components, etc. It can solve problems such as the inability to maximize the utilization of system time slot resources and the difference in the probability of a successful transmission , to achieve the effect of optimizing the allocation of time slot resources and maximizing reliability

Inactive Publication Date: 2017-09-29
SUZHOU UNIV OF SCI & TECH
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Problems solved by technology

In a multi-hop link, the space position of each node is different, and the success probability of a transmission is different, and the average allocation cannot maximize the utilization of system time slot resources.

Method used

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  • Optimization method for retransmission time slot allocation of single-channel multi-hop industrial wireless communication link
  • Optimization method for retransmission time slot allocation of single-channel multi-hop industrial wireless communication link
  • Optimization method for retransmission time slot allocation of single-channel multi-hop industrial wireless communication link

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Embodiment Construction

[0011] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0012] exist figure 1 in, if Indicates the first Probability of successful transmission in one hop, the first The transmission reliability of the hop is denoted as ,but:

[0013] Then the reliability of the whole link is,

[0014] Therefore, the problem of joint allocation of time slots and channels is transformed into the following optimization problem: given the maximum allowable delay of the link and the probability of a successful transmission of each hop on the link, to find the best time slot allocation , so that the reliability of the link is maximized. Expressed mathematically as follows:

[0015]

[0016] In order to solve this problem conveniently, the above problem can be transformed into:

[0017] This optimization problem can be transformed into a traditional resource allocation problem, which can b...

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Abstract

The invention discloses a retransmission time slot allocation optimizing method for single-channel multi-hop industrial wireless communication link. The retransmission time slot allocation optimizing method comprises the following steps: 1) initializing channel parameters and distributing one time slot for each hop; 2) adding one time slot; 3) calculating a marginal increment function; 4) adding one to a counter; 5) going to the step 6 when i is bigger than N, otherwise, going to the step 3, wherein N represents network hops; 6) getting the maximum marginal increment, and storing the hop number n*, wherein n* represents the n*-th hop time delay; and 7) outputting the time slot allocation set d when t is bigger than D-N, otherwise, going to the step 2, wherein D represents the maximum permitted data transmission time delay of the system. According to the retransmission time slot allocation optimizing method, the communication reliability of the whole link is effectively improved.

Description

technical field [0001] The invention relates to a link retransmission time slot allocation optimization method in the wireless communication field, in particular to a single-channel multi-hop industrial wireless communication link retransmission time slot allocation optimization method. Background technique [0002] Following Fieldbus and Industrial Ethernet, industrial wireless technology has become a new research hotspot. Industrial wireless technology has become a representative technology for informatization to promote the development of industrialization, and its wide application in the industrial field is an inevitable trend. On the other hand, industrial data communication has strict requirements such as determinism and real-time performance. "Replacing cables with wireless links" has unparalleled advantages in terms of cost and flexibility, while the reliability and real-time performance of wireless link communication links have become basic and challenging issues. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W72/12H04L1/18
Inventor 许洪华
Owner SUZHOU UNIV OF SCI & TECH
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