Wireless HARQ-ACK Feedback Segmentation for TB and CBG Transmissions
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Solution Overview
Problem
Existing wireless communication systems face inefficiencies in signal transmission, particularly in cellular networks, and lack effective methods for generating and handling Hybrid Automatic Repeat Request (HARQ-ACK) bit sequences when code block group (CBG)-based transmission is enabled or fails, leading to increased overhead and signaling complexity.
Innovation Solution
A user equipment and method for generating separate HARQ-ACK bit sequences for transport block (TB)-based and CBG-based transmissions, utilizing downlink control information (DCI) through PDCCH to optimize HARQ-ACK bit generation and minimize overhead, with the option to append CBG-based HARQ-ACK to TB-based sequences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If separate HARQ-ACK bit sequences are generated for TB-based and CBG-based transmissions, then transmission efficiency is improved and overhead is minimized, but device complexity increases due to the need to handle multiple transmission schemes
Solution Approach 1:
The patent segments the HARQ-ACK feedback mechanism by creating separate bit sequences for TB-based and CBG-based transmissions. This allows independent optimization of each transmission type's acknowledgment process, improving overall transmission efficiency while managing complexity through structured separation of feedback handling.
Solution Approach 2:
The system dynamically adapts between TB-based and CBG-based transmission schemes based on channel conditions and traffic requirements. The HARQ-ACK generation mechanism flexibly switches between the two approaches, allowing the system to optimize performance for different scenarios without requiring a completely separate system for each mode.
2Productivity
If CBG-based transmission is implemented, then spectral efficiency is improved, but signaling overhead increases for managing the additional transmission parameters
Solution Approach 1:
The patent extracts the CBG-based HARQ-ACK feedback as a separate, dedicated component within the overall control information structure. By isolating the CBG-specific acknowledgment bits from the general control signaling, the system achieves efficient CBG-based retransmission while minimizing the impact on overall signaling overhead through targeted resource allocation.
3Reliability
If HARQ-ACK bit sequences are generated for both TB-based and CBG-based transmissions, then reliability is improved through comprehensive feedback, but the quantity of information to be processed increases
Solution Approach 1:
The patent adds a dimensional structure to the HARQ-ACK feedback by organizing acknowledgments in separate sequences for TB-based and CBG-based transmissions. This dimensional separation allows comprehensive feedback coverage for both transmission types while enabling efficient processing through structured, hierarchical organization of the feedback information.
Data Source
AI summary
Disclosed are a user equipment of a wireless communication system and a wireless communication method using the same. More specifically, disclosed are a user equipment including a processor configured to receive DCI through a PDCCH indicating PDSCH scheduling information of each cell in one or more cell(s), identify a transmission scheme in each cell based on a DCI format of the DCI, receive a PDSCH of each cell in the one or more cell(s) based on the scheduling information of the PDCCH, generate a hybrid automatic repeat request acknowledgment (HARQ-ACK) bit sequence for the one or more cell(s) based on the identified transmission scheme of each cell in response to receiving the PDSCH of each cell, and transmit the generated HARQ-ACK bit sequence and a wireless communication method using the same.