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A terminal prediction method of uplink timing advance for satellite communication system

A satellite communication system and timing advance technology, applied in the field of satellite communication, can solve problems such as large propagation delay of satellite communication links, and achieve the effects of ensuring uplink synchronization performance, reducing system load, and being easy to implement.

Active Publication Date: 2021-11-23
上海众睿通信科技有限公司
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Problems solved by technology

[0010] In order to solve the problem of uplink synchronous tracking caused by the large propagation delay of the satellite communication link and the high-speed motion of the satellite, the invention proposes a terminal prediction method for the uplink timing advance of the satellite communication system

Method used

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  • A terminal prediction method of uplink timing advance for satellite communication system
  • A terminal prediction method of uplink timing advance for satellite communication system
  • A terminal prediction method of uplink timing advance for satellite communication system

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Embodiment Construction

[0023] The invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0024] The present invention proposes a satellite communication system uplink timing advance terminal prediction method, which is suitable for the scene where the ground terminal communicates with the ground gateway station through the satellite, and realizes the uplink synchronous tracking among multiple terminals within the coverage range of a satellite beam .

[0025] The uplink transmission sequence of the satellite communication system is as follows: figure 2 shown.

[0026] T 0 : The terminal follows the existing timing advance amount TA INT The moment when the uplink signal is sent.

[0027] T 01 : Terminal T 0 The time at which the transmitted signal reaches the satellite.

[0028] T 1 : Terminal T 0 The moment when the signal sent at the moment arrives at the gateway station.

[0029] T 2 : The moment when the terminal updates the local tim...

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Abstract

The invention discloses a method for predicting an uplink timing advance terminal used in a satellite communication system, belonging to the field of satellite communication. It is suitable for the scenario where the ground terminal communicates with the ground gateway station through the satellite, and realizes the uplink synchronous tracking among multiple terminals within the coverage of one beam of the satellite. The terminal acquires the initial uplink timing advance through random access, and sends the uplink signal in a timing advance manner. The terminal uses the method of the invention to predict the variation of the uplink transmission time delay, obtains the correction value of the uplink timing advance, and updates the timing advance according to a certain frequency, thereby obtaining a relatively accurate open-loop uplink timing tracking mechanism. The present invention uses satellite ephemeris to predict the change of terminal uplink timing advance by predicting the satellite position, so as to ensure uplink synchronization performance; the terminal can maintain uplink timing synchronization by itself without gateway station control, which can effectively reduce system load and is easy to implement .

Description

technical field [0001] The invention belongs to the field of satellite communication, and in particular relates to a method for predicting an uplink timing advance terminal of a satellite communication system. [0002] technical background [0003] Satellite communication is an important achievement of the combination of aerospace technology and modern communication technology. It has been widely used in the fields of radio and television, mobile communication and broadband Internet, and is one of the indispensable communication methods today. Compared with terrestrial communication, satellite communication has the advantages of large coverage area, long communication distance, and communication cost has nothing to do with communication distance. At the same time, the establishment of the satellite communication system is not limited by geographical conditions and has a wide range of mobility. [0004] Satellites include spacecraft in low earth orbit (LEO), medium earth orbi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W56/00H04W74/08
CPCH04W56/001H04W56/004H04W74/0833
Inventor 马松刘田张毅谢伟夏斌王瀚
Owner 上海众睿通信科技有限公司
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