Cooperative communication and switching method and system in low-orbit broadband satellite system

Abstract

The invention belongs to the technical field of low-earth-orbit satellite communication, and particularly discloses a cooperative communication and switching method and system in a low-earth-orbit broadband satellite system. In the method, a terminal carries out service data receiving and sending with a source main satellite and a source auxiliary satellite in a cooperative communication mode, and two cooperative satellites dynamically adjust transmitting power according to attenuation to a user, the terminal carries out power measurement according to network configuration information, generates a measurement report and sends the measurement report to the network controller, the network controller executes switching judgment, if switching needs to be carried out, the network controller stops sending data to the source main satellite and continues to send data to the source auxiliary satellite, then terminal position and time-frequency resource configuration is initiated to a target satellite, and channel resources are allocated to the terminal at the target satellite. According to the method, the problem that the distances between the cooperative satellites and the users are different is solved, it is guaranteed that user signals are not submerged in noise, meanwhile, transmission delay is shortened, and seamless switching of the users in the rapid movement process of the satellites is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of low-orbit satellite communication, and relates to a cooperative communication and switching method and system in a low-orbit broadband satellite system. Background technique [0002] The development of global low-orbit satellite mobile communication and space Internet is in full swing. my country has also incorporated satellite Internet into the scope of new infrastructure. The development of low-orbit satellite Internet has risen to a national strategic project. However, low-orbit satellites move faster relative to the ground and the distance between the satellite and the ground is close, resulting in frequent switching between satellites and users. At the same time, low-orbit broadband communications use high-frequency bands and large-bandwidth frequency bands, such as Ka frequency bands, to provide user speed. The satellite beams are narrow. Make switching more frequent, resulting in system performance...

AI Technical Summary

Problems solved by technology

However, due to the rapid movement of satellites, frequent switching is caused, and there are few researches on the switching method in the cooperative scenario. In addition, because the distance between the cooperative satellite and the user reaches hundreds of kilometers or even thousands of kilometers compared with the ground base station, the distance between two cooperative satellites and the user The distance is also quite different, so that when the collaborative satellite signal reaches the user, the weaker signal may be submerged in the noise, and the expected collaborative effect cannot be achieved; during the frequent switching process, the collaborative data is transmitted from the ground network to the collaborative satellite, and the long-distance caused Transmission delay will also greatly reduce system performance

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