Discovery signal transmitted in direct communication system, and method of transmitting/receiving the discovery signal
AssigneeElectronics and Telecommunications Research Institute
InventorsSoojung JUNG, Sung Kyung KIM, Seungkwon CHO, Chanho YOON, Hyung Jin KIM, Sung Cheol CHANG, DongSeung KWON
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Abstract
A discovery signal that a first device joining in direct communication broadcasts through a radio channel is provided. The discovery signal includes a first field representing whether the discovery signal is a signal for discovering a device or a signal for discovering a service, and a second field including one of device identifier information of the first device and service information of a service that the first device provides according to a value of the first field.
Claims20
A method in which a first device joining in device to device direct communication transmits a discovery signal, the method comprising:
- transmitting a first discovery signal for discovering a device;
- and
- transmitting a second discovery signal for discovering a service,
- wherein the first discovery signal comprises:
- a first field representing whether the first discovery signal is a signal for discovering a device or a signal for discovering a service;
- and
- a second field comprising one of device identifier information (Device ID) of the first device and service information of a service that the first device provides according to a value of the first field,
- wherein the second discovery signal is formed in the same format as that of the first discovery signal.
A method in which a first device joining in direct communication receives a discovery signal, the method comprising:
- receiving the discovery signal;
- determining whether the received discovery signal is a signal for discovering a device or a signal for discovering a service based on a value that is stored at a first field of the received discovery signal;
- acquiring, when the discovery signal is a signal for discovering a device, device identifier information (Device ID) that is stored at a second field of the discovery signal;
- and
- acquiring, when the discovery signal is a signal for discovering a service, service information that is stored at the second field of the discovery signal,
- wherein the discovery signal comprises:
- the first field representing whether the discovery signal is a signal for discovering a device or a signal for discovering a service;
- and
- the second field comprising one of the Device ID of a device that transmits the discovery signal and the service information of a service that a device that transmits the discovery signal provides according to a value of the first field.
A discovery signal that a first device joining in direct communication broadcasts through a radio channel, the discovery signal comprising:
- a first field representing whether the discovery signal is a signal for discovering a device or a signal for discovering a service;
- and
- a second field comprising one of device identifier information (Device ID) of the first device and service information of a service that the first device provides according to a value of the first field.
Dependencies are inferred from the claim text.