Method for transmitting D2D synchronization signal and terminal therefor
AssigneeLG Electronics Inc.
InventorsSeungmin Lee, Byounghoon Kim, Hanbyul Seo
Life of this patent
Estimating the term…
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.
Claims13
A method for transmitting a device-to-device (D2D) synchronization signal by a user equipment (UE) in a wireless communication system, the method comprising:
- receiving, from a base station, a first signal used for a D2D synchronization signal transmission mode including a first transmission mode and a second transmission mode;
- and
- performing transmission of the D2D synchronization signal based on the first or the second transmission mode based on the first signal,
- wherein, in the first transmission mode, the transmission of the D2D synchronization signal is performed based on a signal from the base station, which is used for initiation of the D2D synchronization signal transmission,
- wherein, in the second transmission mode, the transmission of the D2D synchronization signal is performed when a reference signal received power (RSRP) is equal to or smaller than a predetermined first threshold value,
- wherein, despite the RSRP exceeding the first threshold value in the second transmission mode, a modification of the second transmission mode to the first transmission mode is performed when a modification signal is received, and
- wherein the modification signal is used for the modification of the second transmission mode to the first transmission mode.
A user equipment (UE) for transmitting a device-to-device (D2D) synchronization signal, the UE comprising:
- a transceiver configured to transmit and receive radio signals;
- and
- a processor for controlling the transceiver,
- wherein the processor is configured to:
- receive, from a base station, a first signal used for a D2D synchronization signal transmission mode including a first transmission mode and a second transmission mode;
- and
- perform transmission of the D2D synchronization signal based on the first or the second transmission mode based on the first signal,
- wherein, in the first transmission mode, the transmission of the D2D synchronization signal is performed based on a signal from the base station, which is used for initiation of the D2D synchronization signal transmission,
- wherein, in the second transmission mode, the transmission of the D2D synchronization signal is performed when a reference signal received power (RSRP) is equal to or smaller than a predetermined first threshold value,
- wherein, despite the RSRP exceeding the first threshold value in the second transmission mode, a modification of the second transmission mode to the first transmission mode is performed when a modification signal is received, and
- wherein the modification signal is used for the modification of the second transmission mode to the first transmission mode.
Dependencies are inferred from the claim text.