5G wireless edge absolute time synchronization method based on timing message exchange
A timing message and absolute time technology, applied in the direction of synchronization devices, wireless communications, electrical components, etc., can solve problems such as high computational complexity, insufficient precision, and high communication overhead, and achieve low computational complexity, small synchronization overhead, and synchronous high precision effect
Active Publication Date: 2021-07-09
NAT UNIV OF DEFENSE TECH
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[0011] The technical problem to be solved by the present invention is to provide an absolute time synchronization method for 5G wireless edge devices, which can make up for the shortcomings of existing time synchronization methods, such as large communication overhead, high computational complexity and insufficient precision
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[0058] In order to facilitate those skilled in the art to understand and implement the patent of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0059] figure 1 Is the overall flow chart of the present invention. In this implementation, the number of leading repetitions M=12, and the wireless terminal adopts a contention-based random access method ( figure 2 Left) as an example to describe the specific process in detail.
[0060] first step, consider image 3 The local clock C of the terminal UE and the base station gNB shown i (t), C 0 (t), where the local clock frequency offset and phase offset of gNB and UE are uniformly distributed in the range of α ∈ (0.99, 1.01) and β ∈ (-10, 10) ms, respectively.
[0061] In the second step, the UE sends the random access preamble Msg1 to the gNB: the frame structure of Msg1 is as follows Figure 4 As shown, when the U...
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The invention discloses a 5G wireless edge absolute time synchronization method based on timing message exchange, and aims to provide an absolute time synchronization method of a 5G wireless edge device to ensure synchronous cooperation among various industrial devices such as a sensor and an actuator. According to the technical scheme, a base station serves as a master clock source, equipment in a cell serves as a slave clock, and timing message exchange is completed based on the random access process of a 5G network; in order to reduce the synchronization error caused by the interruption delay, selecting a group of timestamps with the minimum interruption delay; calculating propagation time delay according to the time advance, and calculating relative frequency offset and phase offset of a local clock of the terminal according to a relation between timestamps; and a local clock of the terminal is compensated by adopting an FPGA or a voltage-controlled oscillator, so that absolute time synchronization of the wireless terminal is completed. According to the invention, the frequency offset and phase offset problems of the clock are comprehensively considered, the time information is exchanged by using the existing 5G mechanism, and the corresponding timing message frame structure is designed, so that the synchronization precision is high, and the communication overhead and the calculation complexity are low.
Description
technical field [0001] The invention belongs to the field of wireless communication, and in particular relates to a 5G wireless edge absolute time synchronization method based on timing message exchange. Suitable for audio and video production / sharing, motion control systems, drone swarm formations and smart factories and other industrial applications that require synchronous collaboration of different types of equipment. Background technique [0002] With the advent of the Internet of Everything era, the Industrial Internet of Things (IIoT) promotes the transformation of many industrial applications to digitalization and intelligence. Its vision is to quickly and reliably connect people and industrial equipment, and realize the synchronous collaboration of different types of equipment. To this end, the Industrial Internet of Things needs to transition from best-effort communication to deterministic communication, requiring all devices in the network to share a unified time ...
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IPC IPC(8): H04W56/00H04W74/00H04W74/08
CPCH04W56/001H04W56/0035H04W56/0045H04W74/004H04W74/006H04W74/0833
Inventor 刘伟柴子超雷菁朱锦锟赵塑盾李茂范瑞杰王源鑫
Owner NAT UNIV OF DEFENSE TECH