Discovery signal transmitted in direct communication system, and method of transmitting/receiving the discovery signal
First Claim
Patent Images
1. A method in which a first mobile device joining in device to device direct communication transmits a discovery signal, the method comprising:
- transmitting a first discovery signal for discovering a device using at least one of a plurality of discovery resources in one of a plurality of discovery frames for device or service discovery included in an ultraframe, each discovery frame including a plurality of discovery resources that belong to a same resource class of a plurality of resource classes, the plurality of resource classes being periodically available with different cycles, each of the cycles being no smaller than a cycle of the ultraframe; and
transmitting a second discovery signal for discovering a service using the ultraframe, whereinthe first and second discovery signals have a same format, and each includea first field representing whether the first discovery signal is a signal for discovering a device or a signal for discovering a service, anda second field comprising one of device identifier information (Device ID) of the first mobile device and service information of a service that the first mobile device provides according to a value of the first field, anda time interval between each of the plurality of discovery frames corresponds to a length of a plurality of superframes.
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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.
8 Citations
16 Claims
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1. A method in which a first mobile device joining in device to device direct communication transmits a discovery signal, the method comprising:
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transmitting a first discovery signal for discovering a device using at least one of a plurality of discovery resources in one of a plurality of discovery frames for device or service discovery included in an ultraframe, each discovery frame including a plurality of discovery resources that belong to a same resource class of a plurality of resource classes, the plurality of resource classes being periodically available with different cycles, each of the cycles being no smaller than a cycle of the ultraframe; and transmitting a second discovery signal for discovering a service using the ultraframe, wherein the first and second discovery signals have a same format, and each include 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 mobile device and service information of a service that the first mobile device provides according to a value of the first field, and a time interval between each of the plurality of discovery frames corresponds to a length of a plurality of superframes. - View Dependent Claims (2, 3, 4, 5, 6, 7, 10, 11, 12, 13, 15)
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8. A method in which a first mobile device joining in direct communication receives a discovery signal, the method comprising:
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receiving the discovery signal transmitted via at least one of a plurality of discovery resources in one of a plurality of discovery frames for device or service discovery included in an ultraframe, each discovery frame including a plurality of discovery resources that belong to a same resource class of a plurality of resource classes, the plurality of resource classes being periodically available with different cycles, each of the cycles being no smaller than a cycle of the ultraframe; determining whether the 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, and a time interval between each of the plurality of discovery frames corresponds to a length of a plurality of superframes. - View Dependent Claims (9, 14, 16)
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Specification