A cell handover method and device of a low-orbit satellite constellation system based on ephemeris information
A low-orbit satellite, cell handover technology, applied in transmission systems, radio transmission systems, wireless communications, etc., can solve problems such as less consideration of actual system requirements and feasibility of implementation, and achieve the effect of strong operability
Active Publication Date: 2022-03-04
XIAN INSTITUE OF SPACE RADIO TECH
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Research on these criteria is usually based on ideal cellular beams, less consideration is given to the needs of actual systems and the feasibility of implementation
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[0084] Below in conjunction with accompanying drawing and specific embodiment, further set forth the present invention, should be understood that these embodiments are only for illustrating the present invention and are not intended to limit the scope of the present invention, after having read the present invention, those skilled in the art will understand various aspects of the present invention Modifications of equivalent forms all fall within the scope defined by the appended invention claims of the present application.
[0085] The invention discloses a cell switching method and device of a low-orbit satellite constellation system based on ephemeris information. The mobile terminal determines the handover trigger time according to the signal strength of the receiving service satellite, and then predicts the sub-satellite point position of the low-orbit satellite according to the received satellite ephemeris parameters, and calculates the coverage satellite set at the hando...
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The invention discloses a cell switching method and device of a low-orbit satellite constellation system based on ephemeris information. A mobile terminal judges the switching trigger time according to the received service satellite signal strength, and then predicts the low-orbit satellite according to the received satellite ephemeris parameters. The sub-satellite point position of the satellite is calculated according to the predicted sub-satellite point position to calculate the coverage satellite set at the triggering time of handover, compare the mobile terminal with the beam feature point set of all beams of each satellite in the coverage satellite set, and obtain the neighbor cell list. The mobile terminal calculates the visible time of each beam in the neighboring cell list, screens out the beams whose visible time is less than the beam visible time threshold, selects the beam with the largest switching weight in the filtered neighboring cell list as the target beam, and finally sets A request to switch to the target beam is sent to the source beam. The method has the characteristics of improving the reliability of beam cell switching, reducing the probability of ping-pong switching, reducing the number of system control signaling, and improving network efficiency.
Description
technical field [0001] The invention relates to a cell switching method and device of a low-orbit satellite constellation system based on ephemeris information, and belongs to the field of mobility management in mobile communication systems. Background technique [0002] The low-orbit satellite communication system has the characteristics of low delay, high bandwidth utilization and low power consumption of mobile terminals. It is one of the development directions of mobile communication technology in the future. But at the same time, due to the low altitude of the satellite orbit of the LEO system and the high-speed motion of the satellite relative to the earth, the communication connection is frequently switched between satellites or beams, which greatly increases the overhead of system control signaling, and makes the call drop rate and call termination probability significant. promote. Therefore, the mobility management technology is the focus and focus of research on L...
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IPC IPC(8): H04W36/00H04W36/30H04B7/185
CPCH04W36/00835H04W36/00837H04W36/0085H04W36/30H04B7/18521
Inventor 田洲刘岩惠蕾放孙汉汶赵雨毛一丁
Owner XIAN INSTITUE OF SPACE RADIO TECH