HARQ Feedback Resource Allocation for Sidelink Communication
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Solution Overview
Problem
Current wireless communication systems face inefficiencies in HARQ feedback for sidelink communications, particularly due to overhead from unnecessary symbols and complex resource allocation, which reduces the efficiency of frame structures and increases turnaround overhead.
Innovation Solution
Implementing a method where HARQ feedback resources are allocated only in a subset of slots within a frame structure, partitioning resources into separate sets for NACK and ACK communications, and configuring reporting periods system-wide to reduce overhead and improve efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If HARQ feedback resources are allocated in every slot, then feedback coverage is complete, but overhead increases and efficiency decreases
Solution Approach 1:
The patent segments the frame structure by allocating HARQ feedback resources only in specific slots (e.g., every other slot or in designated feedback slots) rather than every slot. This segmentation reduces the number of feedback opportunities while maintaining adequate coverage, thereby improving frame structure efficiency by reducing overhead from unnecessary feedback symbols.
2Measurement precision
If separate NACK and ACK resources are allocated, then feedback precision is improved, but resource complexity increases
Solution Approach 1:
The patent segments feedback resources into separate NACK and ACK resource sets. This segmentation enables precise indication of feedback type through resource selection, improving feedback precision while managing complexity through structured resource organization rather than random allocation.
Solution Approach 2:
Different resource sets are assigned different functions (NACK vs ACK), creating local quality differentiation. This allows the system to optimize each resource set for its specific purpose while maintaining overall system efficiency, as each resource type can be independently managed and configured.
3Productivity
If multi-slot feedback reporting period is used, then overhead is reduced, but feedback timeliness may be compromised
Solution Approach 1:
The patent implements periodic feedback reporting where HARQ feedback is transmitted at regular intervals defined by a multi-slot feedback reporting period. This periodic structure reduces overhead by consolidating feedback transmissions while maintaining timeliness through appropriately configured period lengths that balance overhead reduction with acceptable delay thresholds.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive one or more sidelink communications on a sidelink between the UE and another UE. The UE may transmit one or more hybrid automatic repeat request (HARQ) feedback communications, associated with the one or more sidelink communications, on the sidelink and in a HARQ feedback resource included in a multi-slot feedback reporting period. The HARQ feedback resource may include a set of negative acknowledgement (NACK) resources or the set of NACK resources and a set of acknowledgement (ACK) resources. Numerous other aspects are provided.