Cooperative distributed scheduling for device-to-device (D2D) communication
In a communication system having a plurality of user equipment (UE) devices that are operating in a contention based mode for device-to-device (D2D) communication, each UE device transmits a preferred transmission indicator when a condition for preferred transmission is met at the UE device. If a UE device receives a preferred transmission indicator, the UE device delays transmission of a D2D scheduling assignment (SA) to contend for communication resources for D2D communication. The length of the delay can be based on a number of preferred transmission indicators that are received. The preferred transmission indicator is based on a buffer size in one example.
1. A method comprising:
selecting, at a first user equipment (UE) device, a transmission preference level from a plurality of transmission preference levels, based on a Quality of Service (QoS) required by the first UE device for transmitting data over direct communication, the plurality of transmission preference levels including at least a low level, a medium level, and a high level; and
transmitting, from the first UE device to a second UE device, a scheduling assignment (SA) message including an indicator indicating the selected transmission preference level.
2. The method of claim 1 , wherein the indicator indicates the selected transmission preference level with a plurality of bits.
3. The method of claim 1 , wherein the indicator indicates the selected transmission preference level with more than two bits.
4. A wireless communication user equipment (UE) device comprising:
a controller configured to select a transmission preference level from a plurality of transmission preference levels, based on a Quality of Service (QoS) required by the first UE device for transmitting data over direct communication, the plurality of transmission preference levels including at least a low level, a medium level, and a high level; and
a transmitter configured to transmit, to a second UE device, a scheduling assignment (SA) message including an indicator indicating the selected transmission preference level.
5. The wireless communication UE device of claim 4 , wherein the indicator indicates the selected transmission preference level with a plurality of bits.
6. The wireless communication UE device of claim 4 , wherein the indicator indicates the selected transmission preference level with more than two bits.
7. An apparatus for controlling a user equipment (UE) device, the apparatus comprising:
a memory; and a processor, the processor configured to:
select a transmission preference level from a plurality of transmission preference levels, based on a Quality of Service (QoS) required by a first UE device for transmitting data over direct communication, the plurality of transmission preference levels including at least a low level, a medium level, and a high level; and
transmit, to a second UE device, a scheduling assignment (SA) message including an indicator indicating the selected transmission preference level.
8. The apparatus of claim 7 , wherein the indicator indicates the selected transmission preference level with a plurality of bits.
9. The apparatus of claim 7 , wherein the indicator indicates the selected transmission preference level with more than two bits.