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Clock synchronization method and device for large-scale wireless sensor network

A technology of wireless sensor network and clock synchronization, applied in the direction of synchronization device, wireless communication, network topology, etc., can solve the problem that the routing algorithm cannot meet the needs of smart cities, shocks, etc., and achieve the effect of solving shocks and reducing the failure rate

Active Publication Date: 2013-11-20
SHENZHEN POLYTECHNIC
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the fact that the existing routing algorithm cannot meet the needs of smart cities, this invention proposes a solution, which adopts the concept of dynamic configuration of synchronization period (or life) and effective synchronization range, which can effectively solve the impact of different nodes on the network and reduce time synchronization. The failure rate, solve the problems existing in the existing technology

Method used

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  • Clock synchronization method and device for large-scale wireless sensor network
  • Clock synchronization method and device for large-scale wireless sensor network
  • Clock synchronization method and device for large-scale wireless sensor network

Examples

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no. 1 example

[0032] As shown in accompanying drawing 2 (a), the method flow process of the present invention is as follows:

[0033] Step 1, judging whether to adopt a dynamic configuration synchronization life cycle policy, which allows the synchronization life cycle of each wireless sensor network node in the wireless sensor network to be dynamically changed;

[0034] Step 2, if the dynamic configuration synchronization life cycle policy is adopted, execute the dynamic configuration synchronization life cycle policy; if not, set the synchronization life cycle to the default period T1.

[0035] Specifically, the synchronization cycle of the network is divided into two parameters, T1 > T2, which are used to set time synchronization parameters for different wireless sensor network nodes.

[0036] First, the network coordinator sets the content according to the broadcast time synchronization period required by the network, including node type, node energy threshold, and data fusion requireme...

no. 2 example

[0042] A method for clock synchronization in a large-scale wireless sensor network, comprising: each wireless sensor network node in the wireless sensor network executes a geographical range strategy for dynamic synchronization lifecycle configuration, which allows the wireless sensor network nodes to be divided into Different geographical ranges adopt different time synchronization configuration strategies.

[0043] Specifically, refer to the attachedfigure 1 , according to the second strategy of the present invention, that is, the geographic range strategy of dynamically configuring the synchronization life cycle, the sensor network nodes are divided into different geographic ranges, and different geographic ranges obtain different time synchronization configuration strategies, then within the R4 radius Nodes are configured for a time synchronization cycle T4, and nodes between R4 and R3 are T3.

no. 3 example

[0045] as attached image 3 As shown, another method flow process provided by the present invention is as follows:

[0046] Step 1. Determine whether to adopt the geographical range strategy of dynamic synchronization lifecycle configuration, which allows wireless sensor network nodes to be divided into different geographical ranges;

[0047] Step 2. When it is judged that the geographical scope policy configured by the dynamic synchronization lifecycle is adopted, execute the geographical scope policy configured by the dynamic synchronization lifecycle; when it is judged that the geographical scope policy configured by the dynamic synchronization lifecycle is not adopted, execute the dynamic synchronization lifecycle Periodic configuration strategy.

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Abstract

The invention provides a clock synchronization method for a large-scale wireless sensor network. The method comprises the steps that a synchronization life cycle strategy is dynamically configured, the strategy allows the synchronization life cycle of a sensor network node to be changed dynamically, the life cycle can be permanent or temporary, for example, the life cycle can be one hour, the strategy decides the time synchronization life cycle configured in the network node by taking the basis of the mobility or immobility of the node and the battery level of the node as the criterions; a synchronization geographical range strategy is dynamically configured, the strategy allows the sensor network nodes to be partitioned to different geographical ranges, different geographical ranges obtain different time synchronization configuration strategies, such as synchronous frequency and synchronous life cycle, and the strategy decides the way of partitioning the range of the nodes according to the mobility or immobility of the nodes and the distance of the geographical positions of the nodes. The clock synchronization method for the large-scale wireless sensor network classifies the nodes of the whole network according to the application needs and realizes the synchronization lifetime configuration according to nodes in different types, namely the synchronization service time with different durations is configured, so that the impact of different nodes to the network can be effectively solved, and the fault rate of time synchronization is reduced.

Description

technical field [0001] The invention relates to a clock synchronization method and device in a wireless sensor network, in particular to a clock synchronization method and device in a large-scale wireless sensor network. Background technique [0002] The sensor network time synchronization TPSN (Timing-Sync Protocol for Sensor Networks) algorithm proposed by the Network and Embedded System Laboratory of the University of California uses "sender-receiver" (Sender-Receiver Synchronization, SRS) to perform pairwise synchronization of nodes. work, and extend to the entire network domain. The TPSN algorithm does not estimate the frequency difference of time, which makes it need frequent synchronization and high overhead. In the two lightweight algorithms Tiny-sync and Mini-sync proposed by the researchers, TPSN has been improved, and by exchanging a small amount of messages, it can provide a definite frequency offset and phase offset estimation of the upper bound of the error, w...

Claims

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Application Information

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IPC IPC(8): H04W56/00H04W84/18
Inventor 王洋
Owner SHENZHEN POLYTECHNIC
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