This communication device relays a relay signal to be transmitted to and from a first communication device and a second communication device, and is connected to a first apparatus. The communication device transmits the relay signal using a first transmission slot, and also transmits, using a second transmission slot, a signal having been transmitted from the first apparatus, said signal being transmitted within the transmission period of the first transmission slot in a frequency domain different from that of the first transmission slot.

This communication device relays a relay signal to be transmitted to and from a first communication device and a second communication device, and is connected to a first apparatus. The communication device transmits the relay signal using a first transmission slot, and also transmits, using a second transmission slot, a signal having been transmitted from the first apparatus, said signal being transmitted within the transmission period of the first transmission slot in a frequency domain different from that of the first transmission slot.

A method of transmitting a signal of a base station in a wireless communication system is provided. The method includes transmitting a first signal to the relay station through the transmission period in a subframe including a transmission period and a guard time for transmission/reception switching of a relay station, and transmitting a second signal to a macro user equipment through the guard time. Accordingly, a signal can be effectively transmitted in the wireless communication system employing the relay station.

A method of transmitting a signal of a base station in a wireless communication system is provided. The method includes transmitting a first signal to the relay station through the transmission period in a subframe including a transmission period and a guard time for transmission/reception switching of a relay station, and transmitting a second signal to a macro user equipment through the guard time. Accordingly, a signal can be effectively transmitted in the wireless communication system employing the relay station.

An apparatus is provided which includes a first connection unit configured to provide connection to a user equipment, and a processor configured to detect whether a handover of the user equipment is required, and, if a handover is required, to establish mobility information regarding the mobility state of the apparatus as mobility information of the user equipment, and to send the mobility information to at least one network element involved in the handover of the user equipment.

An apparatus is provided which includes a first connection unit configured to provide connection to a user equipment, and a processor configured to detect whether a handover of the user equipment is required, and, if a handover is required, to establish mobility information regarding the mobility state of the apparatus as mobility information of the user equipment, and to send the mobility information to at least one network element involved in the handover of the user equipment.

A communication device is a communication device that communicates with at least one of a plurality of ground stations via a non-geostationary satellite, and includes: an acquisition unit that acquires predetermined information necessary for switching a connection destination ground station in advance before switching processing; and a communication control unit that switches the connection destination ground station based on the predetermined information.

A communication device is a communication device that communicates with at least one of a plurality of ground stations via a non-geostationary satellite, and includes: an acquisition unit that acquires predetermined information necessary for switching a connection destination ground station in advance before switching processing; and a communication control unit that switches the connection destination ground station based on the predetermined information.

A target communication line defined as a congestion determination target and a client that transmits an ACK signal to a communication partner in a case where a signal is received from the communication partner are relayed to each other. It is determined whether a congestion occurs on a target communication line. A communication of the ACK signal is limited by a capture process that captures the signal communicated by the client in a case where determining that the congestion occurs on the target communication line.

A control unit for controlling wireless data transmissions in a mobile communications system provided on board an aircraft, a mobile communications system having a control unit of this type, an associated method for controlling wireless data transmissions in a mobile communications system provided on board an aircraft, and a computer program for carrying out the method. The control unit comprises a generating component for generating a band-limited masking signal for masking terrestrial mobile communications signals in a first frequency band and a combining component for combining the band-limited masking signal and a service signal for the wireless transmission of data in a second frequency band different from the first frequency band. The combining component is configured to combine the masking signal and the service signal so that terrestrial mobile communications signals in a third frequency band formed by overlapping of the first and the second frequency band are masked.