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Master-slave synchronization method applicable to multi-hop wireless sensor network

A wireless sensor and network technology, applied in the field of wireless networks, can solve problems such as low synchronization efficiency and intensified node conflicts

Inactive Publication Date: 2016-05-25
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, as the network size increases, the conflict between nodes intensifies, and the synchronization efficiency is low

Method used

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  • Master-slave synchronization method applicable to multi-hop wireless sensor network
  • Master-slave synchronization method applicable to multi-hop wireless sensor network
  • Master-slave synchronization method applicable to multi-hop wireless sensor network

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Embodiment Construction

[0022] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

[0023] In the following description, this specification abbreviates the master-slave synchronization method suitable for multi-hop wireless sensor networks proposed by the present invention as MSSM (Master-slave Synchronization Method for Multi-hop Wireless Sensor Networks). MSSM first set the following network operating conditions:

[0024] 1. The network nodes work in the half-duplex state, that is, at the same time, the nodes can only send or receive signals, but cannot send and receive at the same time. The data transmission rate is 2Mbps, the node transmission radius is 250m, and the physical carrier detection radius is 500m , the backoff slot length is 40us;

[0025] 2. Only one pair of receiving / sending nodes is allowed to transmit data at the same time, otherwise it will cause data transmission conflicts;

[0026] 3. The node crystal...

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Abstract

This invention discloses a master-slave synchronization method applicable to a multi-hop wireless sensor network. In an initialization phase, entire network nodes are required to establish a hierarchical structure in the manner of distributing, and acquire levels each node belonged to, and father node and child node information. In a synchronization phase, each level of the father nodes broadcast a synchronization request frame level by level from a root node of the network to initiate a synchronization process, solve through a two-dimensional discrete Markov chain model to get an optimal value of a contention backoff window under the condition of different numbers of the child nodes, and incidentally notify the child nodes about the optimal value simultaneously. After receiving the synchronization request frame, the child nodes compete to reply a synchronization response frame according to the size of the optimal backoff window. After receiving the synchronization response frame, the father nodes compute a time deviation between the father nodes and the child nodes, and notify the child nodes about the time deviation through a synchronization acknowledgment frame. After receiving the synchronization acknowledgment frame, the child nodes adjust the local time so as to finish the synchronization process. The simulation result in EXata proves the validity of the method.

Description

technical field [0001] The invention belongs to the field of wireless networks, in particular to a master-slave synchronization method suitable for multi-hop wireless sensor networks. Background technique [0002] Wireless Sensor Networks (Wireless Sensor Networks, WSN) is a distributed wireless network formed by a large number of sensor nodes scattered in a certain area through self-organization. The sensor nodes perceive and collect the information of the monitored objects in the monitoring area, and send the collected information to the sink node through multi-hop sharing, and the sink node sends the summarized information to the observer through a wired network or a relay network. Compared with the traditional ways of obtaining information, wireless sensor networks have the advantages of fast deployment, self-organization, low cost, low power consumption, and strong scalability, and the nodes in the network can be used in special environments where human survival is diff...

Claims

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Application Information

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IPC IPC(8): H04W56/00H04W84/20
CPCH04W56/001H04W56/0015H04W84/20
Inventor 雷磊王夏楠蔡圣所徐海楼黄太彬徐亚楠严磊
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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