Power efficient relay discovery protocol

A method of wireless communication at a user equipment (UE), comprising:

• deriving synchronization information from a macro network;
• receiving at a user equipment (UE) a discovery signal from a relay, wherein the discovery signal comprises at least one of a downlink signal-to-interference-plus-noise ratio (SINR), an uplink interference, or an uplink pathloss, and wherein the discovery signal does not include synchronization information;
• refraining from using a synchronization signal from the relay;
• and
• sending to the relay a request for relaying with a base station based on the discovery signal.

A method of wireless communication at a user equipment (UE), comprising:

• deriving synchronization information from a macro network;
• receiving at a user equipment (UE) a discovery signal from each of a plurality of relays, wherein the discovery signal comprises at least one of a downlink signal-to-interference-plus-noise ratio (SINR), an uplink interference, or an uplink pathloss, and wherein the discovery signal does not include synchronization information;
• refraining from using a synchronization signal from each of the plurality of relays;
• determining to select one of the plurality of relays based on the discovery signal from each relay;
• and
• sending to a selected relay a request for relaying with a base station based on the discovery signal when one of the plurality of relays is determined to be selected.

An apparatus for wireless communication, the apparatus being a user equipment (UE), comprising:

• means for receiving discovery resource information from a base station;
• means for determining at least one of a downlink signal-to-interference-plus-noise ratio (SINR), an uplink interference, or an uplink pathloss;
• means for deriving synchronization information from a macro network;
• means for refraining from sending a synchronization signal;
• means for sending a discovery signal based on the discovery resource information, wherein the discovery signal comprises the determined at least one of the downlink SINR, the uplink interference, or the uplink pathloss, and wherein the discovery signal does not include synchronization information;
• and
• means for receiving from at least one user equipment (UE) a request for relaying with the base station based on the discovery signal.

An apparatus for wireless communication, the apparatus being a user equipment (UE), comprising:

• means for deriving synchronization information from a macro network;
• means for receiving at a user equipment (UE) a discovery signal from a relay, wherein the discovery signal comprises at least one of a downlink signal-to-interference-plus-noise ratio (SINR), an uplink interference, or an uplink pathloss, and wherein the discovery signal does not include synchronization information;
• means for refraining from using a synchronization signal from the relay;
• and
• means for sending to the relay a request for relaying with a base station based on the discovery signal.

An apparatus for wireless communication, the apparatus being a user equipment (UE), comprising:

• means for deriving synchronization information from a macro network;
• means for receiving at a user equipment (UE) a discovery signal from each of a plurality of relays, wherein the discovery signal comprises at least one of a downlink signal-to-interference-plus-noise ratio (SINR), an uplink interference, or an uplink pathloss, and wherein the discovery signal does not include synchronization information;
• means for refraining from using a synchronization signal from each of the plurality of relays;
• means for determining to select one of the plurality of relays based on the discovery signal from each relay;
• and
• means for sending to a selected relay a request for relaying with a base station based on the discovery signal when one of the plurality of relays is determined to be selected.

An apparatus for wireless communication, the apparatus being a user equipment (UE), comprising:

• a processing system including a processor and configured to:
• receive discovery resource information from a base station;
• determine at least one of a downlink signal-to-interference-plus-noise ratio (SINR) an uplink interference, or an uplink pathloss;
• derive synchronization information from a macro network;
• refrain from sending a synchronization signal;
• send a discovery signal based on the discovery resource information, wherein the discovery signal comprises the determined at least one of the downlink SINR, the uplink interference, or the uplink pathloss, and wherein the discovery signal does not include synchronization information;
• and
• receive from at least one user equipment (UE) a request for relaying with the base station based on the discovery signal.

An apparatus for wireless communication, the apparatus being a user equipment (UE), comprising:

• a processing system including a processor and configured to:
• derive synchronization information from a macro network;
• receive at a user equipment (UE) a discovery signal from a relay, wherein the discovery signal comprises at least one of a downlink signal-to-interference-plus-noise ratio (SINR), an uplink interference, or an uplink pathloss, and wherein the discovery signal does not include synchronization information;
• refrain from using a synchronization signal from the relay;
• and
• send to the relay a request for relaying with a base station based on the discovery signal.

An apparatus for wireless communication, the apparatus being a user equipment (UE), comprising:

• a processing system including a processor and configured to:
• derive synchronization information from a macro network;
• receive at a user equipment (UE) a discovery signal from each of a plurality of relays, wherein the discovery signal comprises at least one of a downlink signal-to-interference-plus-noise ratio (SINR), an uplink interference, or an uplink pathloss, and wherein the discovery signal does not include synchronization information;
• refrain from using a synchronization signal from each of the plurality of relays;
• determine to select one of the plurality of relays based on the discovery signal from each relay;
• and
• send to a selected relay a request for relaying with a base station based on the discovery signal when one of the plurality of relays is determined to be selected.

A non-transitory computer-readable medium storing computer executable code for wireless communication at a user equipment (UE), comprising code executed by a processor for:

• deriving synchronization information from a macro network;
• refraining from sending a synchronization signal;
• receiving discovery resource information from a base station;
• determining at least one of a downlink signal-to-interference-plus-noise ratio (SINR);
• sending a discovery signal based on the discovery resource information, wherein the discovery signal comprises the determined at least one of the downlink SINR, the uplink interference, or the uplink pathloss, and wherein the discovery signal does not include synchronization information;
• and
• receiving from at least one user equipment (UE) a request for relaying with the base station based on the discovery signal.

A non-transitory computer-readable medium storing computer executable code for wireless communication at a user equipment (UE), comprising code executed by a processor for:

• deriving synchronization information from a macro network;
• receiving at a user equipment (UE) a discovery signal from a relay, wherein the discovery signal comprises at least one of a downlink signal-to-interference-plus-noise ratio (SINR), an uplink interference, or an uplink pathloss, and wherein the discovery signal does not include synchronization information;
• refraining from using a synchronization signal from the relay;
• and
• sending to the relay a request for relaying with a base station based on the discovery signal.

A non-transitory computer-readable medium storing computer executable code for wireless communication at a user equipment (UE), comprising code executed by a processor for:

• deriving synchronization information from a macro network;
• receiving at a user equipment (UE) a discovery signal from each of a plurality of relays, wherein the discovery signal comprises at least one of a downlink signal-to-interference-plus-noise ratio (SINR), an uplink interference, or an uplink pathloss, and wherein the discovery signal does not include synchronization information;
• refraining from using a synchronization signal from each of the plurality of relays;
• determining to select one of the plurality of relays based on the discovery signal from each relay;
• and
• sending to a selected relay a request for relaying with a base station based on the discovery signal when one of the plurality of relays is determined to be selected.