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;
wherein the length of the sliding window is determined from the allocated set of subframes, 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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Accused Products
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
20 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; wherein the length of the sliding window is determined from the allocated set of subframes, 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)
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6. 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 acknowledgement 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 aggregating the ACK/NACK feedback comprises identifying subframes that comprise the sliding window, and wherein the subframes that comprise the sliding window comprise subframes from the allocation of the first set of subframes, and 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 (7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. 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 length of the sliding window is determined from the allocated set of subframes, and 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. - View Dependent Claims (20)
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17. A user equipment (UE), 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 UE to; generate acknowledgement and negative acknowledgement (ACK/NACK) feedback for a group of HARQ processes over a DMC link, aggregate 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 aggregating the ACK/NACK feedback comprises identifying subframes that comprise the sliding window, and wherein the subframes that comprise the sliding window comprise subframes from the allocation of the first set of subframes, and wherein the aggregated ACK/NACK feedback retains individual ACK and NACK information, and transmit the aggregated ACK/NACK feedback to other UEs in a 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 (18, 19)
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Specification