Synchronization signal receiving method and user apparatus, and synchronization signal transmission method and base station

A method for transmitting, by a base station, a discovery signal, the method comprising:

• transmitting, by the base station, a synchronization signal of a licensed cell operating in a licensed spectrum;
• transmitting, by the base station, discovery signal configuration information for a unlicensed cell configured as a serving cell for a user equipment through the licensed cell;
• and
• transmitting, by the base station, a discovery signal of the unlicensed cell on the unlicensed cell based on the discovery signal configuration information,
• wherein the discovery signal configuration information includes information indicating a discovery signal configuration periodicity at which a discovery signal configuration duration occurs,
• wherein the discovery signal of the unlicensed cell is transmitted in any one of subframes within the discovery signal configuration duration,
• wherein the synchronization signal of the licensed cell is present on 6 center resource blocks of the licensed cell, and
• wherein the discovery signal of the unlicensed cell includes a synchronization signal of the unlicensed cell, and the synchronization signal of the unlicensed cell is present on a wider frequency resource region than 6 center resource blocks of the unlicensed cell.

A user equipment for receiving a discovery signal, the user equipment comprising:

• a transceiver, and
• a processor configured to control the transceiver, the processor configured to:
• control the transceiver to receive a synchronization signal of a licensed cell operating in a licensed spectrum;
• acquire time and frequency synchronization with the licensed cell based on the synchronization signal of the licensed cell;
• control the transceiver to receive discovery signal configuration information for a unlicensed cell configured as a serving cell for the user equipment through the licensed cell;
• and
• control the transceiver to receive a discovery signal of the unlicensed cell on the unlicensed cell based on the discovery signal configuration information,
• wherein the discovery signal configuration information includes information indicating a discovery signal configuration periodicity at which a discovery signal configuration duration occurs,
• wherein the processor is configured to assume that the discovery signal of the unlicensed cell may occur at any one of subframes within the discovery signal configuration duration,
• wherein the synchronization signal of the licensed cell is present on 6 center resource blocks of the licensed cell, and
• wherein the discovery signal of the unlicensed cell includes a synchronization signal of the unlicensed cell, and the synchronization signal of the unlicensed cell is present on a wider frequency resource region than 6 center resource blocks of the unlicensed cell.

A base station for transmitting a discovery signal, the base station comprising:

• a transceiver, and
• a processor configured to control the transceiver, the processor configured to:
• control the transceiver to transmit a synchronization signal of a licensed cell operating in a licensed spectrum;
• control the transceiver to transmit discovery signal configuration information for a unlicensed cell configured as a serving cell for a user equipment through the licensed cell;
• and
• control the transceiver to transmit a discovery signal of the unlicensed cell on the unlicensed cell based on the discovery signal configuration information,
• wherein the discovery signal configuration information includes information indicating a discovery signal configuration periodicity at which a discovery signal configuration duration occurs,
• wherein the discovery signal of the unlicensed cell is transmitted in any one of subframes within the discovery signal configuration duration,
• wherein the synchronization signal of the licensed cell is present on 6 center resource blocks of the licensed cell, and
• wherein the discovery signal of the unlicensed cell includes a synchronization signal of the unlicensed cell, and the synchronization signal of the unlicensed cell is present on a wider frequency resource region than 6 center resource blocks of the unlicensed cell.