Cross-Carrier Feedback for Sidelink Carrier Aggregation
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently managing cross-carrier feedback for sidelink carrier aggregation, leading to ambiguity and diminished throughput due to misalignment of feedback configurations between user equipment (UEs) in multi-component carrier scenarios.
Innovation Solution
A method and apparatus for wireless communication that involves receiving a configuration indicating component carriers for sidelink carrier aggregation, including a first, second, and third component carrier, and transmitting a physical sidelink feedback channel (PSFCH) on the third component carrier with cross-carrier feedback, which includes ACK/NACK bits and associations with corresponding component carriers and transmission blocks, to ensure clear and reliable feedback reporting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cross-carrier feedback is implemented for sidelink carrier aggregation, then feedback reliability is improved, but configuration alignment complexity increases
Solution Approach 1:
The feedback configuration is segmented into distinct parameters: a first parameter set for the first component carrier and a second parameter set for the second component carrier. Each parameter set independently configures feedback for its respective carrier, allowing flexible and reliable cross-carrier feedback without requiring complete configuration alignment across all carriers.
2Productivity
If multiple component carriers are aggregated for sidelink communication, then system throughput is improved, but feedback ambiguity increases
Solution Approach 1:
Each component carrier is assigned its own dedicated feedback configuration parameters. The first component carrier uses its own parameter set for feedback configuration, while the second component carrier uses its own parameter set. This local quality approach ensures that feedback for each carrier is clearly associated with its specific configuration, eliminating ambiguity even as the number of aggregated carriers increases.
3Measurement precision
If cross-carrier feedback parameters are configured for each component carrier, then feedback accuracy is improved, but configuration overhead increases
Solution Approach 1:
Instead of configuring identical parameter sets for all component carriers, the system applies partial configuration where each carrier receives only the necessary feedback parameters for its specific operation. The first component carrier receives a first parameter set and the second component carrier receives a second parameter set, which may differ based on their specific configurations. This partial action approach provides accurate feedback while reducing unnecessary configuration overhead.
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 configuration. The configuration may indicate component carriers for sidelink carrier aggregation and parameters associated with cross-carrier feedback. The UE may receive a first transmission block on a first component carrier and a second transmission block on a second component carrier. The UE may transmit a physical sidelink feedback channel (PSFCH) on a third component carrier with the cross-carrier feedback. The cross-carrier feedback may include a set of acknowledgement/negative acknowledgement (ACK/NACK) bits and an indication of an association between each ACK/NACK bit and a corresponding one of the first component carrier, the second component carrier, the first transmission block, or the second transmission block. Numerous other aspects are described.