Multicast HARQ-ACK Codebook Configuration for Reliable PDSCH Reception
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Solution Overview
Problem
Existing wireless communication systems face challenges in supporting reliable Hybrid Automatic Repeat Request (HARQ)-Acknowledgement (ACK) feedback for multicast services, particularly in scenarios where HARQ-ACK feedback for multicast is disabled or not configured appropriately, leading to inefficiencies in multicast physical downlink shared channel reception.
Innovation Solution
A user equipment (UE) device is configured to receive RRC signaling indicating a semi-static codebook for both multicast and unicast HARQ-ACK feedback, and generate a HARQ-ACK feedback report that excludes or includes ACK/NACK bits for multicast based on time domain resource assignment or DCI indications, enabling flexible HARQ-ACK feedback mechanisms for multicast services.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If HARQ-ACK feedback for multicast is disabled to simplify the feedback mechanism, then device complexity is reduced, but multicast PDSCH reception reliability deteriorates
Solution Approach 1:
The patent implements dynamic HARQ-ACK feedback for multicast by enabling the UE to generate and transmit HARQ-ACK feedback reports for multicast PDSCH receptions. The feedback mechanism dynamically adapts to multicast service requirements, allowing the system to switch between enabled and disabled states based on configuration parameters received from the base station. This dynamic approach resolves the contradiction by providing reliability when needed while maintaining the capability to simplify when not required.
Solution Approach 2:
The patent changes the configuration parameter state by introducing specific parameters (e.g., first parameter indicating semi-static codebook configuration, second parameter indicating HARQ-ACK feedback enablement) that control the HARQ-ACK feedback behavior. By modifying these parameters based on service requirements, the system can adjust the feedback mechanism to achieve both simplicity and reliability as needed, resolving the fundamental contradiction between these two attributes.
2Device complexity
If a semi-static codebook is configured for both multicast and unicast HARQ-ACK feedback to unify the feedback structure, then device complexity is reduced, but feedback precision for multicast deteriorates when HARQ-ACK feedback for multicast is disabled
Solution Approach 1:
The patent segments the HARQ-ACK feedback codebook into separate configurations for unicast and multicast services. While a unified semi-static codebook structure is maintained for overall simplicity, the feedback precision for multicast is preserved through separate parameter configurations and distinct feedback reporting mechanisms. This segmentation allows the system to maintain low device complexity while achieving high feedback precision for multicast when required.
Solution Approach 2:
The patent implements a universal semi-static codebook configuration that serves both unicast and multicast HARQ-ACK feedback purposes. The codebook structure is designed to be multi-functional, accommodating different service types through parameter configurations. This universality resolves the contradiction by providing a single unified structure that maintains simplicity while adapting to deliver precise feedback for specific services like multicast when needed.
3Reliability
If HARQ-ACK feedback for multicast is enabled to improve reception reliability, then multicast PDSCH reception reliability is improved, but device complexity increases due to additional feedback processing
Solution Approach 1:
The patent merges the HARQ-ACK feedback processing for multicast with the existing unicast feedback mechanisms. By combining these functions into a unified processing framework, the system achieves improved multicast reception reliability through enabled HARQ-ACK feedback while minimizing the increase in device complexity. The merged approach allows shared processing resources and common configuration management, reducing the overall complexity burden.
4Measurement precision
If separate codebook configurations are used for unicast and multicast HARQ-ACK feedback to optimize each service, then feedback precision for each service is improved, but device complexity increases
Solution Approach 1:
The patent implements a dynamic codebook configuration system that adapts between unified and separate configurations based on service requirements. The codebook structure dynamically adjusts its level of segmentation, allowing the system to achieve high feedback precision for both unicast and multicast when needed while maintaining lower complexity through unified configurations when appropriate. This dynamic adaptability resolves the contradiction between precision and complexity.
Data Source
AI summary
The disclosure relates to apparatus and method for supporting Hybrid Automatic Repeat request (HARQ)-Acknowledgement (ACK) feedback for multicast service. In some aspects, a user equipment (UE) device may comprise at least one antenna; at least one radio, coupled to the at least one antenna and configured to perform wireless communication using at least one radio access technology; and one or more processors coupled to the at least one radio, wherein the one or more processors are configured to cause the UE device to: receive, from a base station, a Radio Resource Control (RRC) signaling which indicates that a semi-static codebook is configured for a Hybrid Automatic Repeat Request (HARQ)-Acknowledgement (ACK) feedback for both multicast and unicast and that a HARQ-ACK feedback for multicast is disabled; and generate a HARQ-ACK feedback report which excludes a HARQ-ACK bit for the multicast by using a time domain resource assignment (TDRA) for the unicast to configure the semi-static codebook.