System and Method for Message Acknowledgment Feedback for Device-to-Device Communication Overlaid on a Cellular Network
First Claim
1. A method of operating a communications controller for a direct mobile communication (DMC) link for a group of user equipments (UEs), the method comprising:
- allocating a set of subframes to the group of UEs for the DMC link;
signaling the set of allocated subframes to the group of UEs; and
indicating a length of a sliding window to the group of UEs for UEs of the group of UEs to aggregate acknowledgment and negative acknowledgement (ACK/NACK) feedback for communications over the DMC link according to the length of the sliding window, wherein the aggregated ACK/NACK feedback retains individual ACK and NACK information, andwherein the ACK/NACK feedback for the communications over the DMC link is determined independently from ACK/NACK feedback for cellular transmission between the communication controller and the group of UEs.
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Abstract
An embodiment of a system for operating a communications controller for a group of user equipments engaged in a direct mobile communication (“DMC”) link in a wireless communications system is provided. The communications controller is configured to allocate a set of subframes to the group of UEs for the DMC link, signal the set of allocated subframes to the group of UEs, and signal a length of a sliding window to the group of UEs. In an embodiment, ACK/NACK feedback for communications over the DMC link is aggregated according to the length of the sliding window, and the ACK/NACK feedback for the communications over the DMC link is determined independently from ACK/NACK feedback for cellular transmission between the communication controller and the group of UEs. In an embodiment, the length of the sliding window is a number of subframes.
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Citations
19 Claims
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1. A method of operating a communications controller for a direct mobile communication (DMC) link for a group of user equipments (UEs), the method comprising:
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allocating a set of subframes to the group of UEs for the DMC link; signaling the set of allocated subframes to the group of UEs; and indicating a length of a sliding window to the group of UEs for UEs of the group of UEs to aggregate acknowledgment and negative acknowledgement (ACK/NACK) feedback for communications over the DMC link according to the length of the sliding window, wherein the aggregated ACK/NACK feedback retains individual ACK and NACK information, and wherein the ACK/NACK feedback for the communications over the DMC link is determined independently from ACK/NACK feedback for cellular transmission between the communication controller and the group of UEs. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of operating a user equipment in a group of user equipments (UEs) of a direct mobile communication (DMC) link, comprising:
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generating acknowledgment and negative acknowledgement (ACK/NACK) feedback for a group of HARQ processes over the DMC link; aggregating the ACK/NACK feedback according to a length of a sliding window and an allocation of a first set of subframes for the DMC link received from a communication controller, wherein the aggregated ACK/NACK feedback retains individual ACK and NACK information; and transmitting the aggregated ACK/NACK feedback to other UEs in the group of UEs of the DMC link on a subframe from an allocation of a second set of subframes received from the communications controller, wherein the allocation of the second set of subframes is a subset of the allocation of the first set of subframes. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A communications controller, comprising:
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a transceiver; and a processor unit coupled to the transceiver, the processor unit, in conjunction with the transceiver, configured to cause the communications controller to; allocate a set of subframes to a group of user equipments (UEs) for a direct mobile communication (DMC) link, signal the set of allocated subframes to the group of UEs, and indicate a length of a sliding window to the group of UEs to; enable UEs in the group of UEs to aggregate acknowledgment and negative acknowledgement (ACK/NACK) feedback for communications over the DMC link according to the length of the sliding window, wherein the aggregated ACK/NACK feedback retains individual ACK and NACK information, and enable the ACK/NACK feedback for the communications over the DMC link to be determined independently from ACK/NACK feedback for cellular transmission between the communication controller and the group of UEs.
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Specification