LTE system-based satellite mobile communication uplink transmitting terminal timing adjustment method

A satellite mobile communication and timing adjustment technology, which is applied in the field of broadband satellite communication and navigation, can solve the problems of high first-time success rate requirements for users, easy to be affected by Doppler frequency shift, increase resource consumption of communication system, etc., so as to solve the problem of preamble sequence Design and detect problems, improve the first-time success rate, and improve the effect of signal transmission efficiency

Active Publication Date: 2017-11-07
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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AI Technical Summary

Problems solved by technology

However, the beam cell range of satellite mobile communication is larger than that of ground cells, and the transmission delay difference between users in a satellite beam is relatively large. Therefore, it is necessary to redesign the random access signal format, which generally increases the communication system. Resource consumption, easily affected by Doppler frequency shift, and high requirements for the success rate of user access once

Method used

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  • LTE system-based satellite mobile communication uplink transmitting terminal timing adjustment method
  • LTE system-based satellite mobile communication uplink transmitting terminal timing adjustment method
  • LTE system-based satellite mobile communication uplink transmitting terminal timing adjustment method

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Embodiment 1

[0025] Embodiment 1: as figure 1 As shown, this embodiment provides a timing adjustment method for a multi-beam satellite LTE uplink transmitting end, including the following steps,

[0026] S1: In a beam projected by a satellite to the ground, a certain first ground terminal UE determines its own position information through its own satellite positioning function (such as GPS, Beidou, Galileo, this embodiment takes GPS as an example), the position Information includes, but is not limited to, longitude, latitude, and altitude. Specifically, the ground terminal refers to a processing device for communicating with the satellite within the coverage beam range of the satellite, the several ground terminals access the satellite with improved LTE, and the first ground terminal A terminal UE refers to any one of several ground terminals.

[0027] S2: The first ground terminal UE acquires data such as the latest satellite ephemeris by receiving the pilot signal transmitted by the sa...

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Abstract

The invention relates to the field of broadband satellite communication and navigation, in particular to an LTE system-based satellite mobile communication uplink transmitting terminal timing adjustment method. According to the LTE system-based satellite mobile communication uplink transmitting terminal timing adjustment method, the satellite LTE uplink timing synchronization problem is solved, and the process that in LTE, receiving terminal timing synchronization is conducted by means of TA (timing advance) is omitted; and meanwhile, the leader sequence design and detection problems caused by large user transmission time delay differences in satellite beams are solved, the one-time success rate of user access is increased, the influences of Doppler frequency shift on uplink timing synchronization are reduced, and the signal transmission efficiency is improved.

Description

technical field [0001] The invention relates to the field of broadband satellite communication and navigation, in particular to a timing adjustment method for an uplink transmitter of satellite mobile communication based on the LTE system. Background technique [0002] As the supplement and extension of the terrestrial cellular system, satellite mobile communication has a series of advantages such as large coverage area, long communication distance, and large communication capacity. It is an indispensable communication method to achieve seamless global network coverage. Existing satellite mobile communication systems adopt FDMA, TDMA or CDMA multiple access methods, mainly supporting services at relatively low rates such as text and voice, and are difficult to adapt to the transmission of multimedia information such as video and images. Applying LTE technology to satellite mobile communications can greatly improve data transmission rate, spectrum utilization and cell capacit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W4/02H04W56/00H04B7/185
CPCH04B7/1855H04B7/18554H04W4/023H04W56/0005
Inventor 朱立东刘坤卓永宁廖为城秦思高
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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