Techniques for motion mitigation for uplink power control are disclosed. In one embodiment, a method for use in a satellite communication system comprises: generating a power margin associated with motion of an antenna of a satellite terminal; and generating a first power limit representing a maximum transmit power for the antenna based, at least in part, on the power margin.

A first communication apparatus obtains first ephemeris information of a second communication apparatus, where the first ephemeris information includes information about m parameters of n parameters in second ephemeris information, n is equal to 6, and m is a positive integer less than n, and the n parameters include a first location parameter, a first location parameter, and a first location parameter in first location information, and a first velocity parameter, a first velocity parameter, and a first velocity parameter in first velocity information. The first communication apparatus determines values of the n parameters in the second ephemeris information based on the first ephemeris information, where the values of the n parameters include values of the m parameters and values of remaining n-m parameters. The first communication apparatus communicates with the second communication apparatus based on the second ephemeris information.

Within a satellite communications system, a base station communicates with standard compliant user equipment (UE) via a satellite having a field of view. The base station has a processor that instructs the satellite to generate a wide beam signal covering a plurality of cells in the field of view, and detects an access request from a user equipment within the plurality of cells over the wide beam signal. The base station, comprising a processing device such as an eNodeB, then generates one or more network broadcast/access signals that is uplink to a satellite and broadcasted via one or more nominal beams generated by the satellite, covering all the inactive cells, one of the plurality of cells having the access request.

Methods and systems are described for providing end-to-end beamforming. For example, an end-to-end beamforming system include a relay satellite and a ground network to provide communications to user terminals located in user beam coverage areas. The ground network includes geographically distributed access nodes and a central processing system (CPS). Beamformers of the ground network generate forward uplink signals from appropriately weighted combinations of user data streams that, after relay by the satellite, produce forward downlink signals that combine to form forward user beams.

Methods and systems are described for providing end-to-end beamforming. For example, an end-to-end beamforming system include a relay satellite and a ground network to provide communications to user terminals located in user beam coverage areas. The ground network includes geographically distributed access nodes and a central processing system (CPS). Beamformers of the ground network generate forward uplink signals from appropriately weighted combinations of user data streams that, after relay by the satellite, produce forward downlink signals that combine to form forward user beams.

A communication control device includes: a selection unit that selects, on the basis of a protection target range which is set to the air above a communication device of a second wireless system on the basis of a position of the communication device of the second wireless system which secondarily uses a frequency resource primarily used by a first wireless system, a communication device of the first wireless system as a target for calculating interference applied by the communication device of the second wireless system.

Systems and methods for communications satellites to switch operating modes are described. A communications satellite may operate according to a first operating mode to provide communications services for user terminals in a first coverage area (e.g., providing the user terminals with forward link communications services using a first communication link with a first polarization) The communications satellite may receive correspondingly polarized forward uplink signals from access node terminals in a second coverage area, and the communications satellite may relay respective forward downlink signals to the user terminals in the first coverage area. In some cases, the first coverage area may geographically overlap the second coverage area. The communications satellite may determine a second operating mode (e.g., to optimize the communications services based on dynamic conditions), and the communications satellite may switch to the second operating mode to provide communications services for the user terminals.

Methods and systems are described for providing end-to-end beamforming. For example, end-to-end beamforming systems include end-to-end relays and ground networks to provide communications to user terminals located in user beam coverage areas. The ground segment can include geographically distributed access nodes and a central processing system. Return uplink signals, transmitted from the user terminals, have multipath induced by a plurality of receive/transmit signal paths in the end to end relay and are relayed to the ground network. The ground network, using beamformers, recovers user data streams transmitted by the user terminals from return downlink signals. The ground network, using beamformers generates forward uplink signals from appropriately weighted combinations of user data streams that, after relay by the end-end-end relay, produce forward downlink signals that combine to form user beams.

Methods and systems are described for providing end-to-end beamforming. For example, end-to-end beamforming systems include end-to-end relays and ground networks to provide communications to user terminals located in user beam coverage areas. The ground segment can include geographically distributed access nodes and a central processing system. Return uplink signals, transmitted from the user terminals, have multipath induced by a plurality of receive/transmit signal paths in the end to end relay and are relayed to the ground network. The ground network, using beamformers, recovers user data streams transmitted by the user terminals from return downlink signals. The ground network, using beamformers generates forward uplink signals from appropriately weighted combinations of user data streams that, after relay by the end-end-end relay, produce forward downlink signals that combine to form user beams.

There is provided methods and apparatuses for enabling satellite communication across an orbital seam thereby at least in part improving network latency. According to embodiments, methods and apparatuses are provided to improve network connectivity of satellite networks, where satellite mobility together with long signal acquisition times reduce reliable communication across an orbital seam in a satellite network. According to embodiments, the methods and apparatuses apply to non-terrestrial, for example satellite, polar constellation networks configured to provide global communications services, wherein these communications services may not be supported by terrestrial networks, for example wire-based or fibre-based networks.