Various aspects of the disclosure relate to handoff of a user terminal in communication with a satellite network portal through a satellite. In some aspects, a satellite network portal and a user terminal use a satellite handoff information to determine when to handoff the user terminal from one cell to another and/or from one satellite to another. In some aspects, a user terminal sends capability information, location information, or other information to a satellite network portal whereby, based on this information, the satellite network portal generates the satellite handoff information and/or selects a handoff procedure for the user terminal. In some aspects, handoff of a user terminal to a different satellite involves the user terminal conducting satellite signal measurements and sending a measurement message to the satellite network portal. In some aspects, the satellite network portal generates new satellite handoff information as a result of receiving a measurement message.

Handoff for satellite communication

Embodiments provide in-flight configuration of satellite pathways to flexibly service terra-link and cross-link traffic in a constellation of non-processed satellites, for example, to facilitate flexible forward-channel and return-channel capacity in a satellite communications system. For example, each satellite in the constellation can include one or more dynamically configurable pathway, and switching and/or beamforming can be used to configure each pathway to be a forward-channel pathway or a return-channel pathway in each of a number of timeslots according to a pathway configuration schedule. At least some of the pathways can be further selectively configured, in each timeslot, to carry "terra-link" traffic to and/or from terrestrial terminals and "cross-link" traffic to and/or from one or more other satellites of the constellation.

Flexible capacity satellite constellation

An example system for satellite payload communications includes a digital channelizer and a regenerative communications subsystem (RCS). The digital channelizer includes a plurality of inputs for receiving a plurality of signals from a plurality of uplink beams and a plurality of outputs for outputting the plurality of signals. The RCS includes a plurality of inputs selectably coupled to the digital channelizer outputs to receive signals from selected ones of the digital channelizer outputs and a plurality of outputs selectably coupled to the digital channelizer inputs to transmit the processed signals to selected ones of the digital channelizer inputs. The RCS is configured to process selected ones of the plurality of signals to produce processed signals.

Method and apparatus for routing IP packets in multi-beam satellite networks

The present invention relates to a method, a device and a system for signal synchronization of a satellite communication system. The method comprises: obtaining the first transmission delay of the feed link of a satellite communication system and the second transmission delay of the user link of the satellite communication system, obtaining a time sequence regulation value according to the difference of the first transmission delay and the second transmission delay, transmitting the time sequence regulation value to a communication terminal, and regulating a signal emission time sequence according to the time sequence regulation value through the communication terminal. A LTE downlink transmission channel is ground gateway station-satellite-communication terminal, the TtT uplink transmission channel of the communication terminal is communication terminal-satellite, and for a receiver of the satellite after regulation, the subframe boundaries of the TtT uplink transmission and the LTE downlink transmission are aligned to satisfy the signal synchronization requirement of the TtT and LTE transmission modes with no need for improvement of a TtT physical layer so as to reduce the complexity of the satellite communication system design while realizing signal synchronization.

Method, device and system for signal synchronization of satellite communication system

Star-borne switchboard with distributed mixing structure and implementation method thereof

Satellite mobile communication system based on partial satellite baseband switching

The invention discloses a handover switching method of a user terminal under a single-hop mode in a satellite communication system, belonging to the technical field of satellite communication The method of the invention comprises the following steps: (a) a wireless network controller of a user terminal sends a single-hop resource reconfiguration message to a satellite routing controller and simultaneously starts a double-hop switching process required by signaling; (b) the satellite routing controller judges whether single-hop resources are available or not, wherein if the single-hop resources are available, the wireless network controller indicates the satellite routing controller to execute single-hop resource reallocation and indicates the user terminal to carry out physical channel reconfiguration, and if no single-hop resources are allocated, the wireless network controller indicates the satellite routing controller to release current single-hop resources and indicates the terminal to carry out physical channel reconfiguration according to a double-hop link physical channel message; (c) the satellite routing controller informs the satellite to execute operation; and (d) the wireless network controller completes the ground network operation required by handover switching of the user terminal The invention can be used for satellite mobile communication

Handover switching method of user terminal under single-hop mode in satellite communication system

The invention discloses a satellite mobile communication network multi-machine collaborative simulation system, belonging to the technical field of satellite network simulation The system comprises an interaction control assembly and a user terminal assembly, a mobile satellite assembly, a network assembly and a result display assembly which are in data connection with the interaction control assembly, wherein the interaction control assembly realizes the coordination and the control among the assemblies of the system; the user terminal assembly realizes the acquisition and the transmission control of service information; the mobile satellite assembly realizes the configuration and the simulation of mobile satellite entity functions and controls the execution of a mobile satellite simulation process; the network assembly realizes the configuration and the simulation of mobile satellite network entity functions and controls the execution of a mobile satellite network entity simulationprocess; and the result display assembly realizes the display of predefined simulation results and dynamic simulation data The invention additionally discloses a multi-machine collaborative simulation method corresponding to the system The invention can be used in the satellite mobile communication field

Satellite mobile communication network multi-machine collaborative simulation system and method

User information matching method for satellite mobile communication system

The invention discloses a satellite communication system user information matching method led by a satellite route controller, which belongs to the technical field of satellite communication. A satellite communication system comprises a communication network main body branch and an on-satellite exchange processing unit management control branch, wherein the on-satellite exchange processing unit management control branch comprises the satellite route controller and a satellite control node. The method comprises the following steps that: i, a wireless network controller of a calling party transmits a calling/called identification code of the calling to the satellite route controller; ii, the wireless network controller of the calling party transmits user information of the calling party to the satellite route controller; iii; a wireless network controller of a called party reports user information of the called party to the satellite route controller; and iv, the satellite route controller matches the user information of the calling party and the user information of the called party into a corresponding call connection calling/called pair according to the calling/called identification code. The method can be used for satellite mobile communication.

Zhenxing Gao

Papers

Satellite mobile communication system based on partial satellite baseband switching

Handover switching method of user terminal under single-hop mode in satellite communication system

Satellite mobile communication network multi-machine collaborative simulation system and method

User information matching method for satellite mobile communication system

Satellite communication system user information matching method led by satellite route controller