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Network load dynamic adaptive parameter adjusting method based on priorities

A technology of dynamic self-adaptation and parameter adjustment, applied in advanced technology, electrical components, climate sustainability, etc., can solve problems such as inability to provide differentiated services for data streams, reduce packet loss rate, reduce collisions, and meet high service quality the effect of the request

Active Publication Date: 2014-12-03
HUAQIAO UNIVERSITY
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Problems solved by technology

[0010] The main purpose of the present invention is to propose a dynamic auto-automatic network load based on three priority levels of high, medium and low for the problem that it cannot provide data stream differentiated services based on the research on the IEEE802.15.4MAC protocol CSMA / CA mechanism based on the existing literature. Adaptive parameter adjustment DAPA-CSMA / CA (dynamic adaptive parameter adjusting CSMA / CA) method

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  • Network load dynamic adaptive parameter adjusting method based on priorities
  • Network load dynamic adaptive parameter adjusting method based on priorities
  • Network load dynamic adaptive parameter adjusting method based on priorities

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Embodiment Construction

[0041] The present invention will be further described below through specific embodiments.

[0042] In the priority-based network load dynamic adaptive parameter adjustment DAPA-CSMA / CA (dynamic adaptive parameter adjusting CSMA / CA) improvement method proposed by the present invention, the idea of ​​priority processing includes the priority scheduling strategy (that is, satisfying the requirements of high-priority nodes to send The data packets of the data packets first compete for the channel), the backoff index optimization strategy (high priority nodes can reduce the backoff index in the process of transmitting data), and the parameter adjustment mechanism (different priority nodes perform different CCA detection times or initialize to different backoff index ), specifically, according to the different roles of important protocol parameters in the network (such as fire alarm, industrial process control, temperature and humidity perception, etc.), different priorities are ass...

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Abstract

To solve the problem that data stream differentiated services cannot be provided by a standard time slot carriersense multiple access with collision avoidance (CSMA / CA) mechanism in the IEEE802.15.4MAC protocol, the invention provides a network load dynamic adaptive parameter adjusting (DAPA)-CSMA / CA method based on priorities. According to the method, the different priorities are allocated to different nodes according to the requirement for application timeliness, protocol parameter configuration is optimized so as to achieve the differentiated services, network flow changes are adapted to by dynamically regulating backoff indexes, and on the basis, a channel competition process of the DAPA-CSMA / CA method is theoretically analyzed with the combination of the Markov theory. The method has high network adaptive capability, can reduce the frequency of collision between the nodes, the packet loss probability, time delay and energy consumption, and meets the requirement of a wireless sensor network for high service quality in a real-time monitoring environment better.

Description

technical field [0001] The present invention relates to a wireless sensor network medium access control (MAC, Media Access Control) sublayer processing technology, in particular to a priority-based network load dynamic self-adaptive parameter adjustment method, which is optimized for the CSMA / CA access mechanism in the IEEE802.15.4 standard The method belongs to the technical field of wireless network communication. Background technique [0002] IEEE802.15.4 is an industry standard commonly used in wireless sensor networks. With its energy efficiency and robustness in the physical layer and its flexibility in the media access control (MAC) sublayer, it has become a common underlying communication protocol for wireless sensor networks. The IEEE802.15.4MAC protocol uses the standard time slot CSMA / CA mechanism to compete for channels, which can reduce data collisions to a certain extent, but this algorithm is only suitable for low load situations. With the increase of network...

Claims

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Application Information

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IPC IPC(8): H04W74/08
CPCY02D30/70
Inventor 蒋文贤蔡惠娟
Owner HUAQIAO UNIVERSITY
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