Multi-CORESET DCI Handling for Low-Latency HARQ Feedback
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently handling multiple downlink control information (DCI) messages across multiple control resource set (CORESET) groups, particularly in scenarios involving multiple transmission and reception points (TRPs), leading to increased processing overhead and latency in HARQ feedback.
Innovation Solution
Implementing a method for a user equipment (UE) to manage multiple DCI messages by configuring separate or joint feedback procedures for different TRPs, using dynamic or semi-static HARQ codebooks, and applying skipping rules to reduce overhead, specifically through separate or joint tracking of downlink assignment indexes (DAIs) and applying skipping rules for accurate HARQ feedback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate or joint feedback procedures are implemented for multiple TRPs with dynamic or semi-static HARQ codebooks, then HARQ feedback accuracy is improved, but processing overhead increases
Solution Approach 1:
The system dynamically selects between dynamic and semi-static HARQ codebook configurations based on operational conditions. The DCI messages include indicators that enable the UE to adaptively choose the appropriate codebook type, allowing the system to optimize between feedback accuracy and processing overhead in real-time different conditions
Solution Approach 2:
The feedback procedure is segmented into separate tracking of downlink assignment indexes (DAIs) for different TRPs. Each TRP can be independently monitored and reported, allowing selective application of feedback procedures to specific TRPs rather than uniformly across all TRPs, thereby reducing overall processing overhead
2Productivity
If multiple DCI messages are handled across multiple CORESET groups, then system capacity is improved, but latency in HARQ feedback increases
Solution Approach 1:
The system performs preliminary configuration of HARQ codebooks and DAI tracking parameters before actual data transmission. By pre-configuring the feedback structure and tracking mechanisms, the UE is prepared to rapidly process multiple DCI messages without incurring additional latency during actual operation
Solution Approach 2:
The patent applies skipping rules that allow the UE to bypass certain feedback steps when conditions permit. For example, when using semi-static codebooks with pre-configured structures, the UE can skip dynamic codebook construction steps, thereby reducing processing time and latency while maintaining system capacity
3Productivity
If skipping rules are applied to reduce overhead, then processing efficiency is improved, but feedback accuracy may deteriorate
Solution Approach 1:
The system changes parameters such as codebook size, DAI tracking granularity, and feedback granularity based on operational conditions. By adjusting these parameters dynamically, the system can apply skipping rules to reduce overhead while maintaining sufficient feedback accuracy for the current operational context
Data Source
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AI summary
This disclosure provides systems, methods, and apparatus, including computer programs encoded on computer storage media, for multiple downlink control information message handling for multiple control resource set (CORESET) groups. In one aspect, user equipment (UE) may provide separate or joint feedback for data messages received from different CORESET groups. In some examples, the UE may be configured with code block group (CBG)-based transmissions for a component carrier (CC) or CORESET group in CC. If implementing a dynamic codebook, the UE may track separate transport block (TB)-based and CBG-based downlink assignment indexes (DAI's) for each CORESET group or may track joint TB-based and CBG-based DAIs across the set of CORESET groups to handle the CBG configuration. Additionally, or alternatively, implementing semi-static codebook, the UE may apply skipping rules across the set of CORESET groups or separately for each CORESET group to reduce signaling overhead.