Communication control method and user terminal for selecting synchronization reference of device-to-device (D2D)
First Claim
1. A first user terminal comprising:
- a controller containing at least one processor and at least one memory, whereinin case that the first user terminal is out of coverage area of a communication network including a plurality of base stations, the controller is configured to execute processes of;
directly receiving device-to-device (D2D) synchronization information from a second user terminal being in the coverage area, the D2D synchronization information including coverage information that indicates that the second user terminal is in the coverage area;
determining, based on the coverage information, that the second user terminal is in the coverage area;
selecting the second user terminal as a synchronization reference of the first user terminal in response to determining that the second user terminal is in the coverage area; and
receiving usable resource information broadcasted from the second user terminal that becomes the synchronization reference, the usable resource information indicating D2D usable resources notified from a base station to the second user terminal by broadcast signaling.
1 Assignment
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Accused Products
Abstract
D2D communication is appropriately controlled even in an environment in which a second user terminal inside the coverage and a first user terminal outside the coverage both exist. The first user terminal directly receives from the second user terminal device-to-device (D2D) synchronization information including coverage information that indicates that the second user terminal is in the coverage area, determines, based on the coverage information, whether the second user terminal is in the coverage area, selects the second user terminal as a synchronization reference of the first user terminal in response to determining that the second user terminal is in the coverage area, and receives usable resource information broadcasted from the second user terminal that becomes the synchronization reference, the usable resource information indicating D2D usable resources notified from a base station to the second user terminal by broadcast signaling.
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Citations
6 Claims
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1. A first user terminal comprising:
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a controller containing at least one processor and at least one memory, wherein in case that the first user terminal is out of coverage area of a communication network including a plurality of base stations, the controller is configured to execute processes of; directly receiving device-to-device (D2D) synchronization information from a second user terminal being in the coverage area, the D2D synchronization information including coverage information that indicates that the second user terminal is in the coverage area; determining, based on the coverage information, that the second user terminal is in the coverage area; selecting the second user terminal as a synchronization reference of the first user terminal in response to determining that the second user terminal is in the coverage area; and receiving usable resource information broadcasted from the second user terminal that becomes the synchronization reference, the usable resource information indicating D2D usable resources notified from a base station to the second user terminal by broadcast signaling. - View Dependent Claims (2)
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3. A method for performing by a first user terminal, comprising:
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in case that the first user terminal is out of coverage area of a communication network including a plurality of base stations, directly receiving device-to-device (D2D) synchronization information from a second user terminal being in the coverage area, the D2D synchronization information including coverage information that indicates that the second user terminal is in the coverage area; determining, based on the coverage information, that the second user terminal is in the coverage area; selecting the second user terminal as a synchronization reference of the first user terminal in response to determining that the second user terminal is in the coverage area; and receiving usable resource information broadcasted from the second user terminal that becomes the synchronization reference, the usable resource information indicating D2D usable resources notified from a base station to the second user terminal by broadcast signaling. - View Dependent Claims (4)
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5. A device for controlling a first user terminal, comprising:
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at least one processor and at least one memory, wherein in case that the first user terminal is out of coverage area of a communication network including a plurality of base stations, the at least one processor is configured to execute processes of; directly receiving device-to-device (D2D) synchronization information from a second user terminal being in the coverage area, the D2D synchronization information including coverage information that indicates that the second user terminal is in the coverage area; determining, based on the coverage information, that the second user terminal is in the coverage area; selecting the second user terminal as a synchronization reference of the first user terminal in response to determining that the second user terminal is in the coverage area; and receiving usable resource information broadcasted from the second user terminal that becomes the synchronization reference, the usable resource information indicating D2D usable resources notified from a base station to the second user terminal by broadcast signaling. - View Dependent Claims (6)
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Specification