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Satellite terminal beam selection method based on position information and motion trend

A technology of position information and movement trend, applied in the field of satellite mobile communication, can solve the problems of not considering the influence of terminal residence time, only considering the quality of beam signal, and the existence of ping-pong effect, so as to reduce the number of times of beam reselection and position update, Effect of reducing power consumption and prolonging operating time

Active Publication Date: 2021-06-01
军事科学院系统工程研究院网络信息研究所
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In Chinese patent CN111371486A, a method, system, equipment and storage medium for beam switching based on low-orbit satellites are proposed. By judging the beam signal quality, the beam with the strongest signal quality is selected for switching. This patent is mainly aimed at low-orbit satellite communications. The system is designed and only considers the beam signal quality, there is a risk of ping-pong effect
In the Chinese patent CN107852227B, a satellite communication position report and paging method based on distance threshold control is proposed, and whether to trigger a position report is determined by judging whether the difference between the current position of the user terminal and the expected position exceeds the distance threshold. The patent uses a fixed The distance threshold does not consider the influence of the direction of motion on the terminal's stay time in the beam

Method used

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  • Satellite terminal beam selection method based on position information and motion trend
  • Satellite terminal beam selection method based on position information and motion trend
  • Satellite terminal beam selection method based on position information and motion trend

Examples

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Embodiment 1

[0029] Suppose the satellite terminal is covered by 3 beams at the same time, such as figure 2 As shown, the beam center points of the three beams are respectively recorded as beam center point 1, beam center point 2, beam center point 3, L 1 , L 2 and L 3 are the distances between the satellite terminal and beam center point 1, beam center point 2, and beam center point 3, which can be calculated by the following formula:

[0030]

[0031] Among them, i=1,2,3, R is the radius of the earth, α u , are the longitude coordinates of the satellite terminal and the beam center point i, respectively, β u , are the latitude coordinates of the satellite terminal and the beam center point i, respectively.

[0032] Then, for L 1 , L 2 and L 3 For comparison, let's say L 1 minimum, and L 2 and L 3 are greater than L 1 +ΔL, the satellite terminal selects beam 1 for camping, and then performs the normal location update process.

Embodiment 2

[0034] Suppose the satellite terminal is covered by 3 beams at the same time, such as image 3 As shown, the distance L between the satellite terminal and the beam center point 1, the beam center point 2 and the beam center point 3 1 , L 2 and L 3 Medium L 1 Minimum, L 2 Satisfy L 2 ≤L 1 +ΔL condition.

[0035] The satellite terminal obtains its own motion direction from the integrated angular accelerometer and accelerometer, that is, the angle θ between the velocity vector and true northu , calculate the angle θ between the satellite terminal and the beam center point 1, the beam center point 2 and the satellite terminal velocity vector 1 , θ 2 , calculated as follows:

[0036]

[0037] where m=1,2.

[0038] Subsequently, the satellite terminal compares θ 1 with theta 2 the size of. Suppose θ 2 1 , it can be considered that the satellite terminal will move for a longer time on the beam (beam 2) to which the beam center point with a small included angle belongs...

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Abstract

The invention discloses a satellite terminal beam selection method based on position information and a motion trend, which comprises the following steps that: firstly, a satellite terminal receives longitude and latitude information of each beam center point from a broadcast message, and calculates the distance between the satellite terminal and each beam center point in combination with the position of the satellite terminal; then, selecting the beam with the minimum distance, and judging whether other beams with close distances exist or not; if yes, selecting the beam with the minimum included angle with the movement direction of the satellite terminal from the beams meeting the conditions as a selected beam; if not, assigning the beam with the minimum distance as the selected beam; and finally, enabling the satellite terminal to initiate a normal position updating process. The method provided by the invention can overcome the problem that beam selection is difficult to perform according to channel quality due to small signal strength change from the center to the edge of a satellite beam; thus, the ping-pong effect can be relieved, the frequency of satellite terminal beam reselection and position updating is reduced, the use power consumption is reduced, and the working time is prolonged.

Description

technical field [0001] The present invention relates to the technical field of satellite mobile communications, in particular to a method for selecting a satellite terminal beam based on position information and motion trends. Background technique [0002] As an extension and supplement of terrestrial cellular mobile communication, satellite mobile communication system is mostly used for communication and emergency communication in remote areas, which better solves the problem of limited coverage of terrestrial cellular mobile communication systems in remote areas and sea areas. In the multi-beam satellite mobile communication system, the gateway station will store the information of the paging area where each satellite terminal is located. When the satellite terminal is paged, the gateway station will search for it in the paging area where the satellite terminal is located. Therefore, the satellite terminal needs to inform the gateway station of the paging area where it is ...

Claims

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Application Information

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IPC IPC(8): H04B7/185H04W72/04
CPCH04B7/18541H04B7/18513H04W72/046H04W72/51Y02D30/70
Inventor 何元智鲍峰刘韵
Owner 军事科学院系统工程研究院网络信息研究所