US Patent No. 10,694,579

COMMUNICATIONS TERMINALS, INFRASTRUCTURE EQUIPMENT AND METHODS, FOR UE:S ACTING AS RELAYS


Patent No. 10,694,579
Issue Date June 23, 2020
Title Communications Terminals, Infrastructure Equipment And Methods, For Ue:s Acting As Relays
Inventorship Shinichiro Tsuda, Basingstoke (GB)
Brian Alexander Martin, Basingstoke (GB)
Hideji Wakabayashi, Basingstoke (GB)
Assignee SONY CORPORATION, Tokyo (JP)

Claim of US Patent No. 10,694,579

1. A communications terminal forming part of a mobile communications network comprising one or more infrastructure equipment and one or more other communications terminals, the communications terminal comprisinga transmitter configured to transmit signals via a wireless access interface to the infrastructure equipment and to transmit signals via the wireless access interface to one or more of the other communications terminals in accordance with a device-to-device communications protocol,
a receiver configured to receive signals via the wireless access interface from the infrastructure equipment and to receive signals via the wireless access interface from one or more of the other communications terminals in accordance with a device-to-device communications protocol, and
circuitry comprising a controller configured to control the transmitter and the receiver to transmit and to receive data via the wireless access interface when in a connected mode and to select one of the one or more infrastructure equipment from which to receive paging messages for down-link communications when in an idle mode, wherein the controller is configured
to measure, when in the idle mode, signals received by the receiver from any of the one or more infrastructure equipment, and in accordance with predetermined conditions,
to enter the connected mode,
to discover that one or more of the other communications terminals can act as a relay node to transmit signals to one of the one or more infrastructure equipment which represent data having been transmitted by the transmitter and received by the relay node and to receive signals from the relay node which represent data transmitted by the infrastructure equipment for the communications terminal,
to select one of the discovered communications terminals to act as the relay node for the communications terminal,
to establish a connection in the connected mode with the infrastructure equipment via the relay node to register with the mobile communications network that paging messages for the communications terminal should be transmitted to the relay node, for transmission to the communications terminal, and
to switch from the connected mode to a DRX-connected mode that uses an extended discontinuous reception (DRX) communications protocol and that is distinct from the connected mode and operate in accordance with the DRX communications protocol, wherein, in the DRX-connected mode, the controller controls the receiver to monitor only the one of the one or more communications terminals acting as the relay node.