Device-to-device wireless communication method and user equipment
Provided are D2D wireless communication methods and UEs therefor. In one embodiment, the D2D wireless communication method performed by a UE includes continuing D2D transmission by using a resource from a resource pool allocated for mode 2 operation when switching from mode 1 operation to mode 2 operation. In another embodiment, the D2D wireless communication method performed by a UE includes performing D2D transmission by using a resource from a resource pool allocated for mode 2 operation, wherein the resource pool is indicated by a dedicated RRC signaling transmitted by an eNB, a SIB transmitted by an eNB, a PD2DSCH transmitted by other UE(s), and/or pre-configuration, and the dedicated RRC signaling, the SIB, the PD2DSCH and the pre-configuration are in descending order in priority when determining the resource pool.
1. A communication apparatus comprising:
a receiver, which, in operation, receives information of two or more resource pools, a first resource pool of the two or more resource pools being indicated by a dedicated Radio Resource Control (RRC) signaling from an eNode B and a second resource pool of the two or more resource pools being indicated by a System Information Block (SIB) transmitted from the eNode B; and
a transmitter, which, in operation, transmits a device to device (D2D) signal using one of the two or more resource pools;
wherein, the first resource pool is prioritized in an RRC_CONNECTED state and the second resource pool is prioritized in an RRC IDLE state.
2. The communication apparatus according to claim 1 , wherein a third resource pool of the two or more resource pools is a pre-configured resource pool.
3. The communication apparatus according to claim 1 , wherein the communication apparatus is in mode 2, the mode 2 being a transmission mode in which the communication apparatus autonomously schedules resources for D2D communication.
4. The communication apparatus according to claim 1 , wherein the second resource pool is used when the communication apparatus switches from mode 1 to mode 2, the mode 1 being a transmission mode in which the eNode B schedules resources for D2D communication and the mode 2 being a transmission mode in which the communication apparatus autonomously schedules resources for the D2D communication.
5. The communication apparatus according to claim 1 , wherein each of the two or more resource pools includes a plurality of resources, and the transmitter, in operation, transmits the D2D signal that is mapped to one of the plurality of resources.
6. A communication method comprising:
receiving information of two or more resource pools, a first resource pool of the two or more resource pools being indicated by a dedicated Radio Resource Control (RRC) signaling from an eNode B and a second resource pool of the two or more resource pools being indicated by a System Information Block (SIB) transmitted from the eNode B; and
transmitting a device to device (D2D) signal using one of the two or more resource pools;
wherein, the first resource pool is prioritized in an RRC_CONNECTED state and the second resource pool is prioritized in an RRC IDLE state.
7. The communication method according to claim 6 , wherein a third resource pool of the two or more resource pools is a pre-configured resource pool.
8. The communication method according to claim 6 , wherein the communication method is performed by a communication apparatus that is in mode 2, the mode 2 being a transmission mode in which the communication apparatus autonomously schedules resources for D2D communication.
9. The communication method according to claim 6 , wherein the second resource pool is used when a communication apparatus switches from mode 1 to mode 2, the mode 1 being a transmission mode in which the eNode B schedules resources for D2D communication and the mode 2 being a transmission mode in which the communication apparatus autonomously schedules resources for the D2D communication.
10. The communication method according to claim 6 , wherein each of the two or more resource pools includes a plurality of resources, and the communication method includes transmitting the D2D signal that is mapped to one of the plurality of resources.