A user switching method in satellite communication

Abstract

According to the user switching method in satellite communication, a to-be-switched area relative to a user terminal is set for the edge of a coverage area of each satellite through a ground network management center; and then satellite switching is performed on the user terminal in the to-be-switched area of the satellite, so that the user terminal is connected to other satellites which are within the visual range of the user terminal and are not in the range relative to the to-be-switched area of the user terminal. The method has the advantages that the flexible to-be-switched area is set inthe satellite coverage area, the satellite switching of the user terminal is realized by adopting the user terminal judgment scheme, the strategy is flexible and reliable, the engineering realizationis simple, and the problem of frequent ping-pong switching is well avoided while the user communication quality is ensured.

Description

technical field [0001] The invention relates to the field of satellite communication, in particular to user switching management in satellite communication, and more specifically, to a user switching method based on an area to be switched in satellite communication. Background technique [0002] In satellite communications, especially low-orbit satellites, in order to avoid the high dynamic characteristics of satellites affecting the communication service quality of user terminals, user terminals need to perform frequent switching. Generally speaking, there are the following aspects: [0003] (1) The coverage time of a satellite to the user terminal on the ground is very short, and the signal strength at the edge of the satellite coverage area is relatively weak. In order not to affect the communication service quality of the user terminal, the user terminal needs to switch to other satellites; [0004] (2) The problem of load imbalance caused by uneven distribution of users...

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Problems solved by technology

[0005] (3) The density of satellites gradually increases from the equator to the two poles, and the coverage overlap becomes more and more serious, which makes it difficult for user terminals to select satellites when switching, and "ping-pong" switching is prone to occur

[0014] Among the above-mentioned current switching strategies, the strategy based on the maximum communication angle has the disadvantage of frequent switching in high-latitude regions, and the strategy based on the longest service time and the most available channels has the disadvantage of poor communication quality. The above strategies are mutually exclusive. Although many researchers have added different weights to the above strategies, comprehensively designed and optimized the objective function, handover technologies are based on antenna and other related equipment design, air interface measurement and judgment, protocol system process, or handover objective function optimization algorithm On the one hand, there is no relatively complete strategy for switching locale settings and combining algorithms

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