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LTE satellite uplink synchronization method based on TA grouping

A technology of satellites and user groups, applied in the field of broadband satellite communication and navigation, can solve the most common problems that affect the integration of satellite communication and LTE systems, and achieve the effect of improving effectiveness and real-time performance

Active Publication Date: 2017-09-22
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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AI Technical Summary

Problems solved by technology

The current improvement scheme does not maintain the invariance of the TA advance range in the existing LTE, which affects the maximum commonality of the integration of satellite communication and LTE systems, and cannot make certain improvements for the large delay characteristics of satellite communication, making real-time better sex

Method used

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  • LTE satellite uplink synchronization method based on TA grouping
  • LTE satellite uplink synchronization method based on TA grouping
  • LTE satellite uplink synchronization method based on TA grouping

Examples

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Embodiment 1

[0042] Embodiment 1: as figure 1 Shown, a kind of LTE satellite uplink synchronization method based on TA advance amount grouping comprises the following steps,

[0043] S1: Generate a random preamble according to the default generation rule of the random preamble in the LTE protocol, and the user terminal UE transmits a signal including the random preamble;

[0044] S2: The satellite calculates the round-trip time delay of link transmission from each user terminal UE to the satellite according to the received random preamble;

[0045] S3: According to the setting range of timing advance (Timing Advance, TA) in the ground LTE system, select a reasonable value L within this range, and this L value should be as close as possible to the maximum value in the range so that the number of groups divided into As little as possible, divide each user terminal UE into at least two user groups according to the round-trip delay from each user terminal UE to the satellite;

[0046] S4: The ...

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Abstract

The invention relates to the field of broadband satellite communication and navigation, in particular to an LTE satellite uplink synchronization method based on TA grouping. The LTE grouped based on TA initial lead is suitable for the satellite uplink synchronization method. Grouping is conducted according to the round-trip delay inequality of user link transmission so as to configure the TA initial lead, the TA setting range in the ground LTE protocol standard is avoided from being modified, and the effectiveness and the practicability of the satellite communication are improved by ensuring that the TA initial lead is within a small range.

Description

technical field [0001] The invention relates to the field of broadband satellite communication and navigation, in particular to a TA packet-based LTE satellite uplink synchronization method. Background technique [0002] With the development of wireless communication, in order to realize the seamless coverage of the global communication system, the system integration of ground communication system and satellite communication system is an inevitable trend. At present, the terrestrial LTE system has entered large-scale commercial use, realizing the applicability of the LTE system in satellite communications, which is of great significance for the integration of space-ground integrated communication networks and improving the data transmission rate and spectrum utilization rate of current satellite communications. [0003] In an LTE system, an important feature of uplink transmission is time-frequency orthogonal multiple access (orthogonal multiple access) of different UEs, tha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W56/00
CPCH04W56/0005H04B7/18513H04W56/0045
Inventor 朱立东廖为城卓永宁刘坤秦思高
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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