Devices and methods for D2D synchronization signalling

摘要

Embodiments herein relate to a receiver device; a method therein; a transmitter device and a method therein. The transmitter device is configured to transmit to the receiver device a device-to-device synchronization signal during a time window preceding the start of a resource pool. The transmitter device is further configured to transmit a discovery message during the resource pool. The discovery message includes the identity of the transmitter device for enabling the transmitter device and the receiver device to synchronize to each other.

主权项

1. A method performed by a receiver device for synchronizing with a transmitter device; the method comprising:
receiving from a controller node, a configuration message including information indicating the occurrence of a discovery resource pool within a discovery period; receiving, from the controller node, in a radio resource control message, information on a time window; receiving at least one device-to-device synchronization signal within the time window preceding the start of the discovery resource pool, the time window preceding the start of the discovery resource pool being based on one of (a) a system time and (b) a subframe index indicating a start of a subframe where the discovery resource pool is configured; adjusting synchronization by processing the received at least one device-to-device synchronization signal prior to the receipt of a discovery message from the transmitter device; and receiving, within the discovery resource pool, the discovery message from the transmitter device comprising an identity of the transmitter device.