The various embodiments of the present invention disclose a system and method for discovering User Equipment's over side link in device to device (D2D) communication. The present invention discloses new approaches for discovery and communication scheduling enabling optimum system performance with DRX alignment and meeting varied QoS targets. The present invention further addresses congestion handling during system overload situations. Further, the present invention discloses quality of service (QoS) scheduling methods that consider DRX function achieve substantial gains over existing methods.