Communication device and wireless communication method
A communication device supports a D2D (Device-to-Device) communication and includes a storage, a scheduler and a transmitter. The storage stores a first resource pool information that indicates first resource pool including control resources allocated to control information for transmitting data and a second resource pool information that indicates second resource pool including data resources allocated to data. The scheduler selects a first resource for transmitting control information from the first resource pool and selects a second resource for transmitting data from the second resource pool. The transmitter transmits the control information by using the first resource and transmit the data by using the second resource. The scheduler selects the second resource from the second resource pool according to a received signal intensity in at least one of resources included in the first resource pool and the second resource pool.
1. A communication device that supports a D2D (Device-to-Device) communication, the communication device comprising:
a storage configured to store a first resource pool information that indicates first resource pool including control resources allocated to control information for transmitting data and a second resource pool information that indicates second resource pool including data resources allocated to data, the data is a first type or a second type;
a scheduler configured to select a first resource for transmitting control information from the first resource pool and select a second resource for transmitting data from the second resource pool;
a transmitter configured to transmit the control information by using the first resource and transmit the data by using the second resource, and
a processor circuit configured to control to perform a carrier sense in a first range when the transmitter transmits data of the first type, and to control to perform a carrier sense in a second range when the transmitter transmits data of the second type, the first range being larger than the second range and the second range being a portion of the first range, wherein
the scheduler selects the second resource from the second resource pool according to a received signal intensity in at least one of resources included in the first resource pool and the second resource pool.
2. The communication device according to claim 1 , further comprising
a detector configured to detect a resource that is used by another communication device, wherein
the scheduler selects the second resource from resources other than a resource that is used by another communication device when the detector detects a resource that is used by another communication device.
3. The communication device according to claim 2 , wherein,
the detector decodes a control signal of the other communication device, and detects the resource based on the decoded control signal.
4. The communication device according to claim 1 , further comprising
a measurement unit configured to measure a received signal intensity.
5. The communication device according to claim 4 , wherein
the measurement unit determines a target resource in which a received signal intensity is measured according to a level of priority of the data.
6. The communication device according to claim 1 , wherein
the transmitter determines a transmission power of the data according to a level of priority of the data.
7. The communication device according to claim 1 , wherein
the scheduler selects the second resource from resources in which a received signal intensity is lower than a specified threshold.
8. The communication device according to claim 1 , wherein
the scheduler selects, as the second resource, a resource in which a possibility that another communication device uses the resource is low from the second resource pool according to a received signal intensity.
9. The communication device according to claim 1 , further comprising
a receiver configured to receive information relating to the first resource pool and the second resource pool.
10. The communication device according to claim 1 , wherein
the scheduler selects the first resource from the first resource pool including a plurality of first resource elements that are respectively able to transmit the control information.
11. The communication device according to claim 1 , wherein
the scheduler selects the second resource from the second resource pool including a plurality of second resource elements that are respectively able to transmit the data.
12. The communication device according to claim 1 , wherein
the transmitter transmits the control information and the data by using an identical subframe.
13. The communication device according to claim 1 , wherein
the scheduler selects the second resource from the second resource pool including a plurality of second resource elements that are respectively able to transmit the data, and
the transmitter determines a transmission power of the data according to a level of priority of the data.
14. A communication method in a communication device that supports a D2D (Device-to-Device) communication, the communication method comprising:
storing a first resource pool information that indicates first resource pool including control resources allocated to control information for transmitting data and a second resource pool information that indicates second resource pool including data resources allocated to data in a memory, the data is a first type or a second type;
selecting a first resource for transmitting control information from the first resource pool and selecting a second resource for transmitting data from the second resource pool according to a received signal intensity in at least one of resources included in the first resource pool and the second resource pool;
performing a carrier sense in a first range when the communication device transmits data of the first type;
performing a carrier sense in a second range when the communication device transmits data of the second type, the first range being larger than the second range and the second range being a portion of the first range; and
transmitting the control information by using the first resource and transmitting the data by using the second resource after the carrier sense.
15. A wireless communication system that includes a first communication device and a second communication device that respectively support a D2D (Device-to-Device) communication, wherein
the first communication device includes:
a storage configured to store a first resource pool information that indicates first resource pool including control resources allocated to control information for transmitting data and a second resource pool information that indicates second resource pool including data resources allocated to data, the data is a first type or a second type;
a scheduler configured to select a first resource for transmitting control information from the first resource pool and select a second resource for transmitting data from the second resource pool according to a received signal intensity in at least one of resources included in the first resource pool and the second resource pool;
a transmitter configured to transmit the control information by using the first resource and transmit the data by using the second resource; and
a processor circuit configured to control to perform a carrier sense in a first range when the transmitter transmits data of the first type, and to control to perform a carrier sense in a second range when the transmitter transmits data of the second type, the first range being larger than the second range and the second range being a portion of the first range, and wherein
the second communication device includes
a receiver that receives the control information transmitted by using the first resource and the data transmitted by using the second resource.