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Preemptive Wi-Fi (Wireless Fidelity) TDMA (Time Division Multiple Access) control method

An access control and preemptive technology, applied in network control applications, Wi-Fi network adopts time division multiple access at the data link layer, Wi-Fi network access access control field, can solve the problem of continuous retransmission without discussion The number of times and the success rate of sending, etc., to achieve the effect of taking into account the coexistence of the network

Active Publication Date: 2017-02-22
WUHAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the literature does not discuss the relationship between the number of consecutive retransmissions and the success rate of transmission, that is, the problem of reliability assurance, and also does not involve the coexistence of TDMA and CSMA mechanisms in the same system

Method used

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Embodiment Construction

[0041] In order to facilitate those of ordinary skill in the art to understand and implement the present invention, the present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the implementation examples described here are only for illustration and explanation of the present invention, and are not intended to limit this invention.

[0042] Wi-Fi TDMA is implemented on the basis of the 802.11 physical layer (hardware and software) by modifying the driver program of the data link layer. Therefore, the new protocol stack design includes both the CSMA mechanism of the original IEEE 802.11 protocol and the introduction of The TDMA mechanism and so on.

[0043] 1. Partial modification of IEEE802.11MAC driver

[0044] Modifying CSMA / CA-related functions is the basis for implementing the TDMA protocol. The main modifications are as follows:

[0045] (1) Disable carrier sense, including vi...

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Abstract

The invention discloses a preemptive Wi-Fi (Wireless Fidelity) TDMA (Time Division Multiple Access) control method. On the basis of a realistic environment that different service Wi-Fi networks cover crossly, a preemptive time division multiple access mechanism is employed for control service, and a carrier monitoring conflict avoiding mechanism is employed for Internet access service. The TDMA transport timeliness is ensured in a preemptive mode of not monitoring a channel and not backing off. The TDMA transport reliability is ensured in a continuous repeated preemptive mode. Hybrid working modes of two mechanisms of TDMA and CSMA are realized by sending TDMA frames preferentially.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and relates to an IEEE802.11-based Wi-Fi (Wireless Fidelity) network access control method, in particular to a network control application with high requirements for real-time performance and reliability. The Wi-Fi network adopts a time division multiple access (Time Division Multiple Access, TDMA) method at the data link layer. Background technique [0002] Wireless control networks are increasingly being used in industrial process control, intelligent robots, and the Internet of Things. Germany's "Industry 4.0", the United States' "Industrial Internet", my country's "Made in China 2025" and "Internet +" plans all regard network control technology based on the Internet of Things / Internet as the future industrial foundation. The existing wireless industrial field network standards are mainly based on IEEE802.15.4 WirelessHart (document [1]), ISA100 (document [2]), and my country's...

Claims

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Application Information

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IPC IPC(8): H04W74/02H04L1/16H04L1/18
CPCH04L1/1607H04L1/1867H04W74/02
Inventor 郭成城徐俊凌永清崔佳琦
Owner WUHAN UNIV