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Conflict-free transmission method and system of sensor network

A sensor network and transmission method technology, which is applied in the field of sensor network conflict-free transmission, can solve problems such as difficult recovery of synchronization, low transmission efficiency, congestion and packet loss, etc., to reduce the number of protection time slot allocation requests, improve transmission efficiency, The effect of reducing congestion

Active Publication Date: 2012-02-01
SHENZHEN INST OF ADVANCED TECH CHINESE ACAD OF SCI
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Problems solved by technology

Therefore, when a large number of general nodes request the coordinator to allocate protection slots at the same time, it will cause congestion and packet loss
And when the beacon interval (the time interval between two adjacent beacon frames sent) is very large, the consumption of keeping beacon synchronization is large, and it is difficult to restore synchronization after synchronization is lost
Therefore, the traditional conflict-free transmission method for sensor networks has the problem of low transmission efficiency

Method used

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  • Conflict-free transmission method and system of sensor network
  • Conflict-free transmission method and system of sensor network
  • Conflict-free transmission method and system of sensor network

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Embodiment Construction

[0039] In one embodiment, such as figure 1 As shown, a collision-free transmission method for a sensor network includes the following steps:

[0040] Step S102: Divide the working period of the coordinator into a time slot sequence composed of consecutive time slots, and number the time slots in the time slot sequence, and the number sequence composed of the numbers of the time slots has periodicity.

[0041] In this embodiment, the wireless network is a wireless sensor network based on the IEEE 802.15.4 protocol, and the topological structure is star-shaped, including a coordinator and general nodes connected to the coordinator. General nodes are sensors used to detect environmental changes, and the coordinator is the central node of the star network, connected to other general nodes, not only for detecting environmental changes, but also as a relay node for data transmission.

[0042] In this embodiment, the working period of the coordinator is divided into a time slot sequence wit...

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Abstract

The invention relates to a conflict-free transmission method of a sensor network, which comprises the following steps that: the working period of a coordinator is divided into a time slot sequence which consists of continuous time slots, the time slots in the time slot sequence are numbered and a number sequence which consists of the numbers of the time slots is periodic; the coordinator which works in the time slots in the time slot sequence is virtualized to be virtual coordinators corresponding to the time slots and the time slots with the same number correspond to the same virtual coordinator; general nodes connect with the virtual coordinators; the general nodes send guard time slot allocation requests to the virtual coordinators; the virtual coordinators transmit reply information to the general nodes according to the guard time slot allocation requests; and the general nodes transmit data to the virtual coordinators according to the reply information. By adopting the conflict-free transmission method of the sensor network, the transmission efficiency can be effectively improved.

Description

【Technical Field】 [0001] The present invention relates to the technical field of wireless communication, in particular to a collision-free transmission method and system for a sensor network. 【Background technique】 [0002] In many wireless sensor network applications, such as environmental monitoring, people plan to deploy a large number of sensor nodes in the target area. These nodes can work for months or years without maintenance. In these environments, battery replacement and manual charging are almost impossible. Therefore, energy efficiency is the key. In many practical applications, sensor measurement data is generally collected every few hours or even days. Therefore, the measurement data itself, such as temperature and humidity, can be represented by only one number, usually with a very low data rate. [0003] In order to meet the above requirements, the IEEE 802.15.4 protocol in the traditional technology specifies a medium access control sublayer and a physical layer...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W28/02H04W84/18
Inventor 李晓云苏士娟徐扬生
Owner SHENZHEN INST OF ADVANCED TECH CHINESE ACAD OF SCI
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