Wireless sensor network time synchronization method based on partial timestamp information

A wireless sensor and network time technology, applied in the direction of synchronization devices, network topology, wireless communication, etc., can solve the problems of restricting the application of limited time stamp information synchronization schemes, and the inability to provide clock offset estimates, so as to avoid communication overhead and enrich The effect of the application scene

Pending Publication Date: 2022-07-05
CHONGQING UNIV OF POSTS & TELECOMM
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the existing time-stamp-free synchronization schemes can only provide an estimate of the clock frequency offset, but cannot provide an estimate of the clock phase offset, which restricts the application of the limited time-stamp information synchronization scheme in the actual wireless sensor network to a certain extent.

Method used

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  • Wireless sensor network time synchronization method based on partial timestamp information
  • Wireless sensor network time synchronization method based on partial timestamp information
  • Wireless sensor network time synchronization method based on partial timestamp information

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Experimental program
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Embodiment

[0084] figure 2 This is a flowchart of a method for synchronizing partial timestamp information according to an embodiment of the present invention. The present invention provides a method for estimating clock frequency offset and phase offset based on a partial time stamp information synchronization mechanism, such as figure 2 shown, the specific steps are as follows:

[0085] K1: The synchronization process starts;

[0086] K2: Node A to be synchronized sends ordinary data packets to clock source node B, and records the sent local time as

[0087] K3: After receiving the data packet, the clock source node B records the receiving time as According to the relationship Calculate the local time to return an ack frame, then wait for a while before Time to return confirmation frame;

[0088] K4: record the received local time after the node A to be synchronized receives the acknowledgment frame And calculate the response time interval compensation;

[0089] K5~K7: ...

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Abstract

The invention relates to a wireless sensor network time synchronization method based on partial timestamp information, and belongs to the technical field of wireless sensor networks. According to the method, partial timestamp information and response time interval information are transmitted through the local time of a preset clock source node returning an acknowledgement frame, so that the interaction of timestamps is avoided; and aiming at Gaussian random time delay and exponential random time delay, a maximum likelihood estimation method and an optimal linear unbiased estimation method are respectively adopted to simultaneously estimate clock frequency offset and phase offset so as to realize synchronization between nodes. According to the method, the synchronization information is transmitted without depending on a special synchronization frame, the synchronization function can be embedded into the existing network data flow, and the synchronization energy consumption is effectively reduced.

Description

technical field [0001] The invention belongs to the technical field of wireless sensor networks, and relates to a wireless sensor network time synchronization method based on partial timestamp information. Background technique [0002] In essence, the time synchronization problem in wireless sensor networks is the estimation of the two clock parameters of clock frequency offset and phase offset. However, if the time synchronization method only considers the estimation of the clock frequency offset, although the deviation of the clock operating frequency between nodes can be eliminated, the initial clock phase deviation will always exist, and the nodes cannot achieve true synchronization. On the other hand, if the time synchronization method only considers the estimation of the clock skew, although the local time between nodes can be consistent, the synchronization can only be maintained for a short time. Because the existence of clock frequency deviation will lead to the ra...

Claims

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Application Information

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IPC IPC(8): H04W56/00H04W84/18H04J3/06
CPCH04W56/0035H04W84/18H04J3/0661Y02D30/70
Inventor 王恒彭政岑马文巧
Owner CHONGQING UNIV OF POSTS & TELECOMM
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