Method for transmitting D2D synchronization signal and terminal therefor
AssigneeLG Electronics Inc.
InventorsSeungmin Lee, Byounghoon Kim, Hanbyul Seo
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Abstract
Disclosed is a method for transmitting a synchronization signal of device-to-device (D2D) communication. The method for transmitting a D2D synchronization signal of the present application may comprise a step for transmitting a D2D synchronization signal according to one of transmission modes predetermined on the basis of an instruction of a base station. In addition, a transmission mode for D2D transmission may comprise a transmission mode on the basis of a signaling from the base station and a transmission mode on the basis of a reference signal reception power.
Claims10
A method for transmitting a device-to-device (D2D) synchronization signal (SS) by a user equipment (UE), the method comprising:
- receiving, from a base station (BS), D2D SS configuration including first information regarding an in-coverage signal measurement threshold and second information regarding an out-of-coverage signal measurement threshold;
- while the UE is outside of a coverage of the BS, performing a D2D demodulation reference signal (DMRS) measurement for a D2D SS source;
- while the UE is outside of the coverage of the BS, configuring a D2D SS transmission mode based on a result of the D2D DMRS measurement and the out-of-coverage signal measurement threshold received through the second information;
- and
- while the UE is outside of the coverage of the BS, performing a D2D SS transmission based on the configured D2D SS transmission mode,
- wherein performing the D2D SS transmission comprises:
- based on the D2D DMRS measurement being smaller than the out-of-coverage signal measurement threshold received through the D2D SS configuration, transmitting a D2D SS that is different from the measured D2D DMRS.
A user equipment (UE) for transmitting a device-to-device (D2D) synchronization signal (SS), the UE comprising:
- a transceiver configured to transmit and receive radio signals;
- and
- at least one processor for controlling the transceiver,
- wherein the at least one processor is configured to:
- receive from a base station (BS), D2D SS configuration including first information regarding an in-coverage signal measurement threshold and second information regarding an out-of-coverage signal measurement threshold;
- while the UE is outside of a coverage of the BS, perform a D2D demodulation reference signal (DMRS) measurement for a D2D SS source;
- while the UE is outside of the coverage of the BS, configure a D2D SS transmission mode, based on a result of the D2D DMRS measurement and the out-of-coverage signal measurement threshold received through the second information;
- and
- while the UE is outside of the coverage of the BS, perform a D2D SS transmission based on the configured D2D SS transmission mode,
- wherein in performing the D2D SS transmission:
- based on the D2D DMRS measurement being smaller than the out-of-coverage signal measurement threshold received through the D2D SS configuration, the at least one processor transmits a D2D SS that is different from the measured D2D DMRS.
Dependencies are inferred from the claim text.