Consistency clock synchronization method for wireless sensor network event trigger
A wireless sensor and network event technology, applied in synchronization devices, wireless communication, network topology, etc., can solve the problems of unfavorable node energy saving, synchronization energy waste, etc.
Active Publication Date: 2015-03-11
ANHUI UNIV OF SCI & TECH
View PDF4 Cites 3 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
The consistency synchronization method is robust to the scale of the network, but the synchronization information exchange of the existing methods belongs to the continuous transmission method or the time trigger method, even if the synchronization error of the node meets the synchronization accuracy requirement, the node will still send the synchronization data packet; and the time When designing the trigger cycle of the trigger algorithm, it needs to be designed according to the worst synchronization situation of the network, resulting in a waste of synchronization energy, which is not conducive to the saving of node energy
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0031] In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further described below in conjunction with the accompanying drawings and specific examples.
[0032] Before the detailed description, the mathematical symbols and the node clock model used in the present invention will be described first. The notation of mathematical symbols: Use graph G=(V,E) to represent the connection relationship of N nodes (sensors) in WSN, V={1,2,...,N} is the vertex set of graph G, corresponding to N sensors in a WSN, is the edge set of graph G, if node i can receive the information of node j, then {i,j}∈E, and vice versa If {i,j}∈E, then the node i is called the output neighbor node of j, and j is the input neighbor node of i; Denotes the set of input neighbor nodes of node i, Indicates the in-degree of node i; Denotes the output neighbor node set of node i, Indicates the out-d...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention discloses a consistency clock synchronization method for wireless sensor network event trigger, which relates to clock synchronization of a random topology network and takes transmission delay and packet loss among nodes into account. According to the method, synchronization information is broadcast only when a specified event occurs, namely, the difference between current state and sending state of last time of a network node is greater than a trigger threshold value, so that network synchronization information content is small; state updating of the network node only requires input of local time of a neighbor node, and synchronization information broadcast among nodes only comprises an integer representing the local time of the node, so that an information packet is short; in view of the impact of transmission delay and packet loss on synchronization performance, a state updating method in the condition of transmission delay and packet loss is provided; and adjustment parameters of a consistency controller is only related to indegree of the node, and a network topology does not need maintenance. The invention also provides an upper bound of transmission delay and packet loss rate through numerical simulation.
Description
technical field [0001] The invention belongs to the technical field of wireless sensor networks, and relates to a wireless sensor network event trigger consistent clock synchronization method. Background technique [0002] Clock synchronization is a supporting technology of wireless sensor networks. Applications such as data fusion, speed measurement of moving objects, and time-division multiple access technology all require nodes in a local area to have consistent time. Existing clock synchronization methods can be divided into tree / cluster-based clock synchronization and consistent clock synchronization according to whether topology needs to be maintained. The common point of clock synchronization methods based on trees / clusters is that they need to regularly maintain the network topology and select special reference nodes, cluster head nodes, and gateway nodes. The communication volume of network topology maintenance is large, which is not conducive to the saving of wirel...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Applications(China)
IPC IPC(8): H04W56/00H04W84/18
CPCH04W56/002H04W84/18
Inventor 陈珍萍黄友锐李德权曲立国唐超礼凌六一
Owner ANHUI UNIV OF SCI & TECH