The invention discloses a
trunking communication method of a low-
orbit constellation satellite communication
system, which comprises the following steps of: setting a low-
orbit trunking communication frame structure: aiming at a
trunking communication service of the low-
orbit constellation satellite communication
system, adding
channel associated signaling on a service channel or an uplink shared channel, controlling a
communication link, and setting a low-orbit trunking communication frame structure; synchronization between the
satellite terminal and the satellite is realized; a low-orbit trunking communication switching process: satellite terminals are switched in the base stations under the same gateway
station or among the base stations under the same gateway
station; in the switching process, the cluster controller selects the matched frequency resources from the overall situation for allocation, and
resource allocation and switching negotiation between the cluster controller and the
base station are achieved. According to the invention, the frame structure meeting the rapid synchronization requirement is added on the service channel, the link is controlled, and rapid synchronization is realized; and a communication flow between the cluster controller and the
base station is also designed, so that the functions of
resource allocation, switching negotiation and the like between the cluster controller and the
base station during the cluster service are realized.