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Wireless communication method and system with collision avoidance protocol

一种无线通信、协议的技术，应用在无线通信、多路复用通信、时分多路复用系统等方向，能够解决WirelessHART不良网络性能等问题，达到周期业务包传输改善、改善性能、重新传输过程改善的效果

Active Publication Date: 2013-04-03
ABB (SCHWEIZ) AG
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  • Summary
  • Abstract
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AI Technical Summary

Problems solved by technology

However, WirelessHART suffers from poor network performance due to its inefficient segmented ALOHA-like operation of shared transaction slots

Method used

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  • Wireless communication method and system with collision avoidance protocol
  • Wireless communication method and system with collision avoidance protocol
  • Wireless communication method and system with collision avoidance protocol

Examples

Experimental program
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Embodiment Construction

[0053] figure 1 A schematic flow diagram of a channel contention method is shown in the form of an algorithm for handling double time slots arranged in a superframe compatible with the WirelessHART protocol. A superframe contains both dedicated transaction slots and shared transaction slots, hence the name double slot or even hybrid slot.

[0054] The figure shows a sequence of actions comprising steps 1-14 of the method. According to the method of the present invention, when transmitting, each WirelessHART node in the wireless network as a source node maintains the following three variables:

[0055] back exponent (BOExp),

[0056] Backoff Count (BOCntr) and

[0057] Number of CCU slots (CCANo).

[0058]Initially, BOExp and BOCntr are initialized to 0 (zero). CCANo is equal to the number of CCA slots in the shared transaction slot, and in the preferred example, it is equal to six as can be seen in step 1 .

[0059] When a node has a burst packet that needs to be transmi...

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Abstract

The invention concerns a method for providing wireless communication between a source node and a destination node in a wireless network wherein said wireless network uses a time division multiple access (TDMA) protocol. One or more dedicated TDMA transaction timeslots (60-71) are arranged in a superframe. The superframe comprises at least one dedicated transaction slot forming a hybrid protocol with two or more shared transaction slots 50 per superframe. The method is of particular advantage when practised with a WirelessHART protocol wireless sensor network and when used for monitoring and control equipment and processes in an industrial installation. A computer program, and a wireless node and a wireless network using the inventive method are also disclosed.

Description

technical field [0001] The present invention relates to wireless communication in environments with risk of colliding wireless signals and / or interference. In particular, the present invention relates to a method and system for slot allocation comprising both dedicated time division multiple access transaction slots and shared transaction slots with a mechanism for contention for collisions . The invention is especially advantageous when used in wireless networks for monitoring and control purposes in the field of industrial process control and automation. Background technique [0002] Wireless technology brings several benefits to industrial automation in terms of productivity and flexibility gains. Industrial sites are often harsh environments with stringent requirements on cable type and quality. Furthermore, large sites often require thousands of cables and it may be difficult to install or engineer additional cabling in an already congested site. Thus, wireless comm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W74/08
CPCH04W84/18H04J3/1694H04W74/085
Inventor M·吉德伦德杨冬申巍徐有志张婷婷
Owner ABB (SCHWEIZ) AG
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