Determined communication scheduling method of industrial wireless network

An industrial wireless network and communication scheduling technology, applied in the field of industrial wireless network scheduling, can solve problems such as unsuitable scheduling, limited duty cycle, and inability to communicate, achieve channel access mechanism specifications, meet real-time performance, and have low reliability Effect

Inactive Publication Date: 2008-12-10
CHONGQING UNIV OF POSTS & TELECOMM
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Problems solved by technology

The TDMA scheme limits the duty cycle, and two adjacent cluster heads cannot communicate; although the Beacon-Only scheme solves the collision problem of beacon frames, data will still be generated when the guaranteed time slot is used. Frame collision, so not suitable for scheduling
In addition, the competition stage in the IEEE 802.15.4 standard does not distinguish between priorities, and there are only 7 guaranteed time slots at most in the non-competition stage, which limits the expansion of the network

Method used

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  • Determined communication scheduling method of industrial wireless network
  • Determined communication scheduling method of industrial wireless network
  • Determined communication scheduling method of industrial wireless network

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Embodiment Construction

[0014] On the basis of following the IEEE 802.15.4 standard, the present invention defines a competition stage, a dedicated stage, a temporary dedicated stage and a sleep stage in the superframe structure by modifying the superframe structure of the IEEE 802.15.4. The combination of scheduling and channel hopping effectively solves the problem of interference between clusters with overlapping coverage areas in the tree network, and optimizes the tree network scheduling, so that the data transmitted in the network can be transmitted in the shortest time. reach the destination node.

[0015] 1. Superframe structure

[0016] The present invention specifies the channel access control in the cluster through the MAC sublayer superframe (Superframe) structure. The superframe structure of the present invention will be described in detail below. like figure 1 Shown is the superframe structure modified from the IEEE 802.15.4 standard. A superframe consists of 24 time slots, starting...

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Abstract

The invention requests a certainty communication scheduling method for protecting industrial wireless network, relating to the field of industrial automatic control. Aiming at the problem that the existing industrial wireless network is unable to basically solve the beacon collision problem of multi-hop network, the invention redefines super-frame structure according to IEEE 820.15.4 standard. Competition stage, dedicated stage and dormant stage are defined in the super-frame structure. The communication scheduling between nodes is controlled according to the super-frame structure. The channel is changed once at the beginning of every super-frame by adopting the channel hopping technology, so that the channel sequence of the whole network is different and the take-off points of every cluster are different. The invention which solves the beacon collision problem of multi-hop network can be widely applied to the industrial wireless control network.

Description

technical field [0001] The invention relates to the field of automatic control, in particular to a scheduling technology of an industrial wireless network. Background technique [0002] With the rapid development of wireless communication technology, 802.11b, ZigBee, Bluetooth, IEEE 802.15.4 and other technologies have been gradually applied to industrial sites. The introduction of these wireless communication technologies solves the problems of difficult industrial field wiring, high installation and maintenance costs, but cannot adapt to the complex industrial field environment, and cannot meet the real-time, deterministic, reliable and low power consumption requirements of the industrial field. [0003] The IEEE 802.15.4 standard, as a low-power, low-rate PHY / MAC standard, is adopted as the underlying standard by ISA100.11a, Wireless Hart, etc. due to its own advantages. The beacon of the time slot defined by IEEE 802.15.4 enables the network to have the characteristics ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L12/56H04L29/06H04W72/12H04W74/08
Inventor 王平王恒李增波李同波
Owner CHONGQING UNIV OF POSTS & TELECOMM
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