Apparatus and method for providing relay selection in device-to-device communication system

A method of a relay in a communication system, the method comprising:

• transmitting a relay discovery message including a service code used for identifying a connectivity service and a user information identifier (ID) associated with a relay among relays, and
• wherein the relay discovery message is associated with reference signals,
• wherein the connectivity service is discovered in a user equipment (UE), in case that the service code included in the relay discovery message is same as a service code configured to the UE for a connectivity service authorized to be accessed by the UE, and the user information ID included in the relay discovery message is same as a user information ID configured to the UE for the relay providing connectivity service,
• wherein a radio quality between the UE and the relay is measured based on the reference signals,
• wherein the measured radio quality is used in selection of a relay for the UE, and
• wherein the radio quality is a linear average over power contributions of resource elements carrying the reference signals.

A user equipment (UE) in a communication system, the UE comprising:

• at least one processor configured to:
• receive, from relays, relay discovery messages, each relay discovery message including a user information identifier (ID) associated with a relay among the relays and a service code used for identifying a connectivity service,
• identify that the connectivity service is discovered in case that the service code included in the relay discovery message is same as a service code configured to the UE for a connectivity service authorized to be accessed by the UE, and the user information ID included in the relay discovery message is same as a user information ID configured to the UE for the relay providing the connectivity service,
• measure radio qualities between the UE and relays based on a result of the identification, and
• select one of the relays as a relay for the UE based on the measured radio qualities,
• wherein each of the radio qualities is a linear average over power contributions of resource elements carrying reference signals.

A relay in a communication system, the relay comprising:

• at least one processor configured to transmit a relay discovery message including a service code used for identifying a connectivity service and a user information identifier (ID) associated with a relay among relays, and wherein the relay discovery message is associated with reference signals,
• wherein the connectivity service is discovered in a user equipment (UE), in case that the service code included in the relay discovery message is same as a service code configured to the UE for a connectivity service authorized to be accessed by the UE, and the user information ID included in the relay discovery message is same as a user information ID configured to the UE for the relay providing the connectivity service,
• wherein a radio quality between the UE and the relay is to be measured based on the reference signals,
• wherein the measured radio quality is to be used in selection of a relay for the UE, and
• wherein the radio quality is a linear average over power contributions of resource elements carrying the reference signals.