UTC-based signal transmission timing method

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...

AI Technical Summary

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

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