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Low-orbit satellite constellation system cell switching method and device based on ephemeris information

A low-orbit satellite and cell switching technology, which is applied in the transmission system, radio transmission system, wireless communication, etc., can solve problems such as less consideration of the actual system requirements and the feasibility of realization, and achieve the effect of strong operability

Active Publication Date: 2020-05-19
XIAN INSTITUE OF SPACE RADIO TECH
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Problems solved by technology

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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  • Low-orbit satellite constellation system cell switching method and device based on ephemeris information
  • Low-orbit satellite constellation system cell switching method and device based on ephemeris information
  • Low-orbit satellite constellation system cell switching method and device based on ephemeris information

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Embodiment Construction

[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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Abstract

The invention discloses a low-orbit satellite constellation system cell switching method and device based on ephemeris information. The method comprises the steps of enabling a mobile terminal to receive the signal intensity of a service satellite; judging a switching triggering moment, then predicting a subsatellite point position of a low-orbit satellite according to a received satellite ephemeris parameter; calculating a coverage satellite set of the switching triggering moment according to the predicted subsatellite point position; and comparing a mobile terminal with a beam feature pointset of all beams of each satellite in the coverage satellite set to obtain an adjacent cell list. The mobile terminal calculates the visual time of each beam in the neighbor cell list, screens out thebeams of which the visual time is less than a beam visual time threshold, selects the beam with the maximum switching weight in the screened neighbor cell list as a target beam, and finally sends a request of switching to the target beam to a source beam. The method has the characteristics that the beam cell switching reliability is improved; the ping-pong switching probability is reduced; the number of system control signaling is reduced; and the network efficiency is improved.

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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
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
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