Patent ID: 9699826
Date: 2017-07-04
CPC Classifications: H04W

Claim:
1. A method for a device-to-device (D2D) operation performed by a user equipment (UE) in a radio resource control (RRC) idle state in a wireless communication system, the method comprising: determining whether a serving cell of the UE is a suitable cell among an acceptable cell, a suitable cell, a barred cell and a reserved cell, wherein the acceptable cell is a cell on which the UE camps to obtain limited service, the suitable cell is a cell on which the UE camps to obtain normal service, the barred cell is a cell on which the UE is not allowed to camp and the reserved cell is a cell reserved by system information; determining whether the serving cell provides resource pool information; and transmitting a D2D signal within a resource indicated by the resource pool information if the serving cell is the suitable cell and if the serving cell provides the resource pool information, wherein the resource pool information indicates a plurality of resource pools, and wherein the UE selects a resource pool among the plurality of resource pools and transmits the D2D signal using the selected resource pool.