A database-assisted spectrum sharing method between satellite systems and terrestrial cellular networks

Abstract

The invention provides a database-assisted satellite system and ground cellular network spectrum sharing method. The method comprises the steps that firstly, a satellite broadcasts the beam coverage range and the overhead time of the satellite to a ground station through a downlink, and beam coverage range information and overhead time information form a satellite trajectory database; then the ground station and the ground cellular network share a satellite trajectory database; and finally, when the cellular base station needs to access the millimeter wave frequency band for spectrum sharing,the cellular base station sends own position information to the satellite trajectory database, and the satellite trajectory database feeds back the maximum available transmitting power to the cellularbase station. The method is simple, the time delay is controllable, the outage probability of the satellite link is reduced, the utilization rate of the frequency spectrum opportunity is improved, and the throughput of the ground cellular network is improved.

Description

technical field [0001] The invention belongs to the technical field of spectrum sharing, in particular to a database-assisted satellite system and ground cellular network spectrum sharing method. Background technique [0002] At present, the radio system mainly uses 3MHz-3GHz spectrum resources to work. Due to the use of many radio systems, the 3MHz-3GHz spectrum resources are already close to saturation, and it is difficult to further improve the spectrum utilization of this frequency band in the short term. Above 3GHz, a large number of spectrum resources are allocated to satellite systems. On the one hand, the spectrum resources allocated to satellite systems have not been fully utilized; The communication capacity is increased dozens of times. In the early days, due to relatively high frequencies, such as K-band (18-27GHz) and Ka-band (27-40GHz), other radio service systems were rarely deployed in satellite frequency bands. Currently, the 5th generation (5G) broadband ...

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Problems solved by technology

[0004] However, the satellite signal is weak and susceptible to interference. When there is no dedicated satellite antenna for high-gain reception of the satellite signal, the ground cellular network cannot determine whether the satellite signal exists through spectrum sensing, that is, whether the satellite is overhead

If the terrestrial cellular network users fail to detect satellite signals during the satellite over-top period and still use the same frequency as the satellite system to reuse millimeter-wave spectrum resources, it will cause serious interference to the satellite link and even cause the satellite link to be interrupted

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