Method and apparatus for device-to-device communication
AssigneeSamsung Electronics Co., Ltd.
InventorsAnil Agiwal, June Hwang, Young-Bin Chang
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Abstract
A device-to-device (D2D) communication method is provided. The D2D communication method includes the operations of receiving, by a first terminal, system information including a threshold value for link quality with a base station (BS) from the BS, measuring, by the first terminal, the strength of a signal from a serving cell, comparing, by the first terminal, the measured strength of the signal with the threshold value, and searching for a second terminal acting as a relay between the first terminal and a network when the measured strength of the signal is less than the threshold value on the basis of the compared result.
Claims16
A method for device-to-device (D2D) communication, by a remote user equipment (UE), the method comprising:
- receiving, from a base station, system information including a threshold of reference signal received power (RSRP) and a hysteresis value;
- measuring RSRP between the base station and the remote UE;
- identifying whether to transmit a discovery solicitation message based on a condition for communicating with a relay UE that serves as a relay between the remote UE and a network;
- and
- transmitting the discovery solicitation message according that the condition is met,
- wherein the condition is met in a case that the RSRP is below the threshold of RSRP by the hysteresis value, and
- wherein the remote UE is in a radio resource control (RRC) idle state or an RRC connected state.
A remote user equipment (UE) for device-to-device (D2D) communication, the remote UE comprising:
- a transceiver;
- and
- at least one processor configured to:
- control the transceiver to receive, from a base station, system information including a threshold of reference signal received power (RSRP) and a hysteresis value,
- measure RSRP between the base station and the remote UE,
- identify whether to transmit a discovery solicitation message based on a condition for communicating with a relay UE that serves as a relay between the remote UE and a network, and
- control the transceiver to transmit the discovery solicitation message according that the condition is met,
- wherein the condition is met in a case that the RSRP is below the threshold of RSRP by the hysteresis value, and
- wherein the remote UE is in a radio resource control (RRC) idle state or an RRC connected state.
Dependencies are inferred from the claim text.