Patent ID: 9736817
Date: 2017-08-15
CPC Classifications: H04W

Claim:
1. A method in a first user equipment (UE) for sending beacon signals, which beacon signals are to be received by a second UE to discover the first UE for Device to Device (D2D) communication, which first UE is comprised in a wireless network, the method comprising: receiving from a network node information about a set of available peer discovery resources to be used in a peer discovery frame by the first UE for sending beacon signals, which beacon signals are to be detected by the second UE, obtaining, from the network node, information about a number of registered first UEs within a cell or tracking area associated with the network node, obtaining a beacon transmission probability, which beacon transmission probability is the probability that the first UE transmits a beacon signal in a specific peer discovery frame, and wherein obtaining the beacon transmission probability comprises determining the beacon transmission probability based on a number of available peer discovery resources in the set of available peer discovery resources and a number of active first UEs, at each specific peer discovery frame determining according to the beacon transmission probability, whether or not a beacon signal shall be transmitted during that specific peer discovery frame, and when determining to transmit a beacon signal during that specific peer discovery frame, sending the beacon signal by choosing one of the peer discovery resources out of the received set of available peer discovery resources.