UE Feedback for Mixed Grant Types
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Solution Overview
Problem
In wireless communication networks, the existing feedback mechanisms for mixed grant types, such as reduced hybrid automatic repeat request (HARQ)-acknowledgement (ACK) feedback, often result in delayed or stale feedback due to limited uplink communication capacity, leading to inefficiencies and reduced system performance.
Innovation Solution
A method and apparatus for determining a threshold for feedback bits associated with physical downlink shared channel (PDSCH) grant types, allowing for the transmission of feedback messages with a controlled size, prioritizing high-priority PDSCHs, and deferring or dropping low-priority feedback reports to ensure timely and flexible feedback to the base station.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If the UE sends feedback for all received PDSCHs in order of reception, then the feedback is complete and accurate, but the feedback message size exceeds the available uplink communication capacity
Solution Approach 1:
The patent extracts only the most critical feedback information (ACK/NACK for high-priority PDSCHs) from the complete feedback set, excluding less important information (CSI for low-priority PDSCHs) when the feedback message would exceed uplink capacity. This selective extraction ensures the feedback message fits within available resources while preserving essential information for system operation.
Solution Approach 2:
The patent applies different prioritization rules to different types of feedback information based on their importance. ACK/NACK feedback for high-priority PDSCHs (such as those carrying URLLC traffic) is preserved and transmitted first, while CSI feedback for low-priority PDSCHs is deferred or dropped. This local quality differentiation ensures critical information is transmitted while managing overall message size.
2Quantity of substance
If the UE defers sending feedback to a later uplink communication to reduce message size, then the feedback message fits within capacity limits, but the feedback becomes delayed and stale
Solution Approach 1:
The patent segments feedback information into high-priority and low-priority categories, with high-priority feedback (ACK/NACK for critical PDSCHs) transmitted immediately in the current uplink slot, while low-priority feedback (CSI for non-critical PDSCHs) is deferred to later opportunities. This segmentation ensures timely delivery of essential feedback while allowing non-critical feedback to be postponed.
Solution Approach 2:
The patent transmits a partial feedback set containing only the most critical information (ACK/NACK for high-priority PDSCHs) when full feedback would exceed uplink capacity. This partial action ensures the feedback message fits within resource constraints while providing sufficient information for the base station to maintain system operation, with the understanding that complete feedback will be provided when capacity allows.
3Loss of information
If the UE includes all feedback information in the feedback message, then the base station receives comprehensive information, but the overhead cost increases and system efficiency decreases
Solution Approach 1:
The patent dynamically changes the composition and size of the feedback message based on uplink capacity conditions and PDSCH priority levels. When uplink capacity is limited, the feedback message includes only essential parameters (ACK/NACK for high-priority PDSCHs). When capacity is available, more comprehensive feedback (including CSI for multiple PDSCHs) is transmitted. This parameter adaptation optimizes system efficiency by matching feedback detail to actual network conditions.
Data Source
AI summary
This disclosure provides systems, methods, and devices for wireless communication that support feedback for mixed grant types. In a first aspect, a user equipment (UE) is configured to determine a threshold associated with a number of bits for feedback of one or more physical downlink shared channel (PDSCH) grant types. The UE is further configured to transmit a feedback message including feedback information for one or more received PDSCHs associated with the one or more PDSCH grant types. A number of bits of the feedback information included in the feedback message for the one or more received PDSCHs associated with the one or more PDSCH grant types is less than or equal to the threshold. Other aspects and features are also claimed and described.