HARQ-ACK Codebook Segmentation for Wireless Uplink Efficiency
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Solution Overview
Problem
The increasing number of user equipment (UEs) and the growing volume of data and control information in wireless communication systems pose challenges for base stations (BSs) to efficiently manage limited radio resources, particularly in terms of latency, reliability, and the efficient transmission of HARQ-ACK information.
Innovation Solution
A method for a UE to transmit HARQ-ACK information efficiently by receiving configurations for multiple HARQ process-based HARQ-ACK codebooks, generating the indicated codebook based on downlink control information (DCI), and transmitting it accordingly. This method includes options for code block group (CBG) level feedback and new data indicator (NDI) feedback, allowing for flexible adjustment of payload size and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple HARQ process-based HARQ-ACK codebooks are configured for different subsets of HARQ processes, then the efficiency of HARQ-ACK information transmission is improved and latency is reduced, but the device complexity and configuration overhead increase
Solution Approach 1:
The patent divides the HARQ processes into multiple subsets, with each subset associated with a separate HARQ-ACK codebook. This segmentation allows parallel processing of different HARQ processes, improving transmission efficiency while managing complexity through structured organization of codebooks for different process groups.
Solution Approach 2:
The patent introduces dynamic selection mechanisms where the UE and BS can dynamically choose which codebook to use based on current transmission conditions, DCI indications, and HARQ process states. This dynamic approach optimizes performance for varying traffic patterns while maintaining manageable complexity through adaptive rather than static configuration.
2Reliability
If HARQ-ACK codebook payload size is increased to include more HARQ processes, then more comprehensive feedback is provided, but the transmission time and latency increase
Solution Approach 1:
By segmenting HARQ processes into subsets with separate codebooks, the patent enables parallel transmission of feedback for different process groups. This reduces the time required to transmit comprehensive feedback compared to a single large codebook, as multiple smaller codebooks can be processed and transmitted more efficiently.
Solution Approach 2:
The patent allows selective inclusion of HARQ processes in different codebooks based on priority and urgency. Critical or time-sensitive HARQ processes can be placed in codebooks that are transmitted with higher priority or shorter delay, while less urgent processes can be handled in subsequent transmissions, achieving comprehensive feedback without uniform delay for all processes.
3Productivity
If code block group (CBG) level feedback is enabled for precise error identification, then retransmission efficiency is improved, but the payload size and processing complexity increase
Solution Approach 1:
The patent applies CBG-level feedback selectively to specific codebooks or HARQ process subsets rather than uniformly to all processes. This allows precise error identification and targeted retransmission for processes where it provides the most benefit, while maintaining simpler feedback mechanisms for other processes, thus improving overall retransmission efficiency without uniformly increasing complexity across all HARQ processes.
Data Source
AI summary
A UE may: receive a configuration pertaining to a plurality of HARQ process-based HARQ-ACK codebooks, wherein the plurality of HARQ process-based HARQ-ACK codebooks are respectively related to a plurality of subsets of HARQ processes configured in the UE; receive DCI including indication information indicating one of the plurality of HARQ process-based HARQ-ACK codebooks; and transmit the indicated HARQ process-based HARQ-ACK codebook on the basis of the DCI. The configuration may include or exclude CBG level feedback-related parameters for each of the HARQ process-based HARQ-ACK codebooks.