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 from a base station information of a first resource pool being indicated by a dedicated Radio Resource Control (RRC) signaling and information of a second resource pool being indicated by a System Information Block (SIB); and
a transmitter, which in operation, transmits a device to device (D2D) signal using the first resource pool or the second resource pool,
wherein the first resource pool is utilized among the first resource pool, the second resource pool and a preconfigured resource pool in a case that the first resource pool and the second resource pool are indicated in an RRC_CONNECTED state, and the second resource pool is utilized among the second resource pool and the preconfigured resource pool in a case that the second resource pool is indicated in an RRC IDLE state.
2. The communication apparatus according to claim 1 , wherein a transmission of the D2D signal is in a non-exceptional case.
3. 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 an 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.
4. The communication apparatus according to claim 1 , wherein each of the first resource pool and the second resource pool includes a plurality of resources, and the D2D signal is mapped to one of the plurality of resources.
5. A communication method comprising:
receiving from a base station information of a first resource pool being indicated by a dedicated Radio Resource Control (RRC) signaling and information of a second resource pool being indicated by a System Information Block (SIB); and
transmitting a device to device (D2D) signal using the first resource pool or the second resource pool,
wherein the first resource pool is utilized among the first resource pool, the second resource pool and a preconfigured resource pool in a case that the first resource pool and the second resource pool are indicated in an RRC_CONNECTED state, and the second resource pool is utilized among the second resource pool and the preconfigured resource pool in a case that the second resource pool is indicated in an RRC IDLE state.
6. The communication method according to claim 5 , wherein a transmission of the D2D signal is in a non-exceptional case.
7. The communication method according to claim 5 , 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 a base station 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.
8. The communication method according to claim 5 , wherein each of the first resource pool and the second resource pool includes a plurality of resources, and the D2D signal is transmitted in one of the plurality of resources.