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UTC-based signal transmission timing method

A technology of sending timing and timing error, applied in the field of communication, can solve the problems of large difference in path propagation delay, poor propagation delay, difficult receiving timing, etc., to improve the utilization efficiency of system resources, reduce the time uncertainty range, The effect of satellite reception timing is easy

Inactive Publication Date: 2019-08-20
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, in a mobile satellite communication system, the distance between the mobile station on the ground and the control station, that is, the satellite, is very different. Therefore, the path propagation delay of the uplink signal to the control station is very different, and the uncertainty of the time when the control station receives the uplink signal is also very large. , causing it to receive timing difficulties
In addition, in order to prevent the uplink signal sent by the mobile station from leaking to the next uplink signal and causing interference, a guard interval is usually added between the transmission blocks to absorb the maximum path propagation delay difference between different mobile stations and the control station, and the resource overhead is very large

Method used

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Embodiment Construction

[0017] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0018] Please refer to figure 1 , which shows an architecture diagram of a VDES system provided by an exemplary embodiment of the present invention, the network environment includes several mobile stations and control stations. Among them, the control station of the VDE-SAT system is a low-orbit satellite with an orbital height of 600 km and a moving speed of 8 km / s. The farthest path distance to the mobile station on the ground is 2830 km, and the sho...

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Abstract

The invention provides a UTC-based signal sending timing method, which comprises the following steps: (1) a mobile station and a control station in a system obtaining UTC time through a UTC synchronization process, and (2) the control station sending downlink information to the mobile station according to the synchronized UTC time; (3) detecting downlink information by the mobile station, making adifference value between the synchronized UTC time and the detected downlink time, and the difference value being the timing quantity of uplink transmission of the mobile station; and (4) taking thesynchronized UTC time as a base point, advancing the uplink sending time of the mobile station according to the estimated timing quantity, and sending uplink information to the control station by themobile station. According to the method, the uplink transmission time is obtained by adopting the estimation method, different mobile stations adjust the uplink timing advance of themselves to send uplink signals in advance, the path delay difference of uplink transmission to the control station is eliminated or reduced, the uncertain range of the receiving time of the control station is effectively reduced, the protection interval time reserved between transmission blocks is correspondingly shortened, and the system spectrum utilization efficiency is improved.

Description

technical field [0001] The present invention relates to the communication field, and more specifically, to a UTC-based transmission timing method. Background technique [0002] UTC is the abbreviation of Coordinated Universal Time. The full name is Coordinated Universal Time, also known as Universal Time, Universal Standard Time, and International Coordinated Time. [0003] For a wireless communication system that establishes system timing based on UTC time, if the uplink signal sent by the mobile station to the control station is carried out according to the system timing, the uplink signal sent by the mobile station farther away from the control station will be the same as the uplink signal sent by the mobile station closer to the control station. The propagation time of the transmitted uplink signal to the control station is different. For example, in a mobile satellite communication system, the distance between the mobile station on the ground and the control station, t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/185
CPCH04B7/1853H04B7/18573
Inventor 尤肖虎张菁菁汪茂
Owner SOUTHEAST UNIV
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