Sidelink HARQ Feedback Resource Determination
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Solution Overview
Problem
Current wireless communication systems face challenges in reliably determining resources for sidelink hybrid automatic repeat request (HARQ) feedback, particularly in sidelink carrier aggregation configurations, leading to ambiguity and inefficient throughput.
Innovation Solution
The solution involves determining resources for sidelink HARQ feedback based on a physical sidelink feedback channel (PSFCH) format, using either explicit or implicit indications, to ensure accurate alignment and reliable interpretation of HARQ feedback across multiple sidelink component carriers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If sidelink HARQ feedback is transmitted on multiple component carriers, then the throughput is improved, but the resource determination becomes ambiguous and complex
Solution Approach 1:
The patent combines HARQ feedback from multiple component carriers into a single component carrier for transmission. The receiving UE aggregates HARQ-ACK information from multiple PSSCH transmissions on different component carriers and transmits consolidated feedback on one designated PSFCH resource, simplifying resource management while maintaining throughput benefits
Solution Approach 2:
The patent introduces a designated component carrier as an intermediary for HARQ feedback transmission. This intermediary carrier serves as a central point for consolidating and transmitting feedback information from multiple component carriers, resolving the ambiguity in resource determination while preserving the throughput advantages of multi-carrier operations
2Reliability
If explicit resource indication is used for PSFCH, then the reliability of resource determination is improved, but the signaling overhead increases
Solution Approach 1:
The patent performs preliminary configuration of PSFCH resources through higher-layer signaling (RRC or MAC-CE) before actual HARQ feedback transmission. This preliminary action establishes the resource mapping rules in advance, ensuring reliable resource determination without requiring repeated explicit indications in each HARQ feedback message, thus reducing ongoing signaling overhead
3Quantity of substance
If implicit resource determination is used for PSFCH, then the signaling overhead is reduced, but the measurement precision of resource allocation decreases
Solution Approach 1:
The patent changes the parameters used for implicit resource determination by establishing precise mapping relationships between component carrier indices and PSFCH resources through higher-layer configuration. This allows implicit determination to achieve precision comparable to explicit indication, reducing signaling overhead while maintaining accurate resource allocation through pre-defined parameter mappings
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive a plurality of physical sidelink shared channel (PSSCH) communications on a plurality of sidelink component carriers. The UE may transmit, using a set of resources on a single component carrier of the plurality of sidelink component carriers and based at least in part on a determination of the set of resources, a plurality of hybrid automatic repeat request acknowledgement (HARQ-ACK) feedback indications corresponding to the plurality of PSSCH communications, wherein the determination of the set of resources is based at least in part on a physical sidelink feedback channel (PSFCH) format. Numerous other aspects are provided.