Device-to-device (D2D) operation method carried out by terminal in RRC connection state in wireless communication system, and terminal using the method
AssigneeLG Electronics Inc.
InventorsSunghoon Jung, Youngdae Lee
Life of this patent
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Abstract
Provided are a device-to-device (D2D) operation method carried out by a terminal in an RRC connection state in a wireless communication system, and a terminal using the method. The method is characterized by: determining whether a communication link with a base station is problematic; and transmitting a D2D signal using an exception resource, when the communication link with the base station is determined to be problematic.
Claims8
A method for performing device-to-device (D2D) operation in a wireless communication system, the method performed by a user equipment (UE) and comprising:
- determining whether a radio link failure is detected while the D2D operation is performed using a first type resource scheduled by a base station (BS);
- performing the D2D operation on a second type resource, which is autonomously selected by the UE in a resource pool, when the radio link failure is detected;
- starting a specific timer when the UE performs the D2D operation on the second type resource;
- determining whether the UE receives a configuration for the D2D operation from the BS while the specific timer is running;
- stopping the specific timer when the UE receives the configuration for the D2D operation from the BS;
- and
- performing the D2D operation on the first type resource scheduled by the BS upon stopping the specific timer,
- wherein the UE determines that the radio link failure is detected when a timer, which is started upon detecting a physical layer problem, expires.
A user equipment (UE) for performing device-to-device (D2D) operation, the UE comprising:
- a radio frequency (RF) transceiver that transmits and receives a radio signal;
- and
- a processor connected to the RF transceiver to operate, wherein the processor is configured to:
- determine whether a radio link failure is detected while the D2D operation is performed using a first type resource scheduled by a base station (BS);
- perform the D2D operation on a second type resource, which is autonomously selected by the UE in a resource pool, when the radio link failure is detected;
- start a specific timer when the UE performs the D2D operation on the second type resource;
- determine whether the UE receives a configuration for the D2D operation from the BS while the specific timer is running;
- stop the specific timer when the UE receives the configuration for the D2D operation from the BS;
- and
- perform the D2D operation on the first type resource scheduled by the BS upon stopping the specific timer,
- wherein the UE determines that the radio link failure is detected when a timer, which is started upon detecting a physical layer problem, expires.
Dependencies are inferred from the claim text.