PDSCH Reference Signal Segmentation for HARQ Feedback
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Solution Overview
Problem
In wireless communication systems, there is a need for efficient methods to transmit and receive signals, particularly for hybrid automatic repeat request (HARQ) feedback in scenarios involving multiple physical downlink shared channels (PDSCHs) and reference signals, where existing technologies face challenges in optimizing resource allocation and feedback mechanisms for reliable communication.
Innovation Solution
A method for a user equipment (UE) to determine and use specific reference signals and physical downlink shared channels for signal reception and to transmit HARQ feedback based on associated physical uplink control channel resources, allowing for efficient resource allocation and feedback configuration, including ACK/NACK-based schemes and shared PUCCH resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple PDSCHs are configured to carry the same transport block with multiple reference signals, then the reliability of signal reception is improved, but the device complexity and resource allocation complexity increase
Solution Approach 1:
The patent segments the reference signals into different types (first reference signal and second reference signal) and associates each PDSCH configuration with specific reference signals. This segmentation allows the UE to selectively use appropriate reference signals for different PDSCHs, improving reception reliability while managing complexity through structured organization of multiple configurations
Solution Approach 2:
The patent enables dynamic selection of reference signals and PDSCH configurations based on UE capability and network conditions. The system can adaptively choose which reference signal to use for TB reception and which PUCCH resource to use for HARQ feedback, allowing flexibility to optimize performance while managing complexity based on actual operational requirements
2Reliability
If multiple PUCCH resources are configured for HARQ feedback, then the reliability of feedback transmission is improved, but the loss of time for resource determination increases
Solution Approach 1:
The patent performs preliminary configuration of multiple PUCCH resources and their associations with PDSCH-reference signal combinations before actual data transmission. By pre-establishing these mappings and configuring them in advance, the UE can quickly determine the appropriate PUCCH resource for HARQ feedback without performing complex real-time analysis, thus improving reliability while minimizing time loss
Solution Approach 2:
The patent introduces an intermediary mapping relationship between PDSCH configurations, reference signals, and PUCCH resources. This intermediary structure allows the system to manage multiple PUCCH resources efficiently by establishing predetermined associations, enabling fast resource determination while maintaining multiple options for reliable feedback transmission
Data Source
AI summary
According to an embodiment of the present the UE may receive configuration information regarding a plurality of physical downlink shared channels (PDSCHs) which are configured to carry a same transport block (TB); receive the TB through at least one of the plurality of PDSCHs, based on at least one of a plurality of reference signals (RSs) related to the plurality of PDSCHs; and transmit hybrid automatic repeat request (HARQ) feedback information for the TB based on at least one of a plurality of physical uplink control channel (PUCCH) resources.