HARQ-ACK Codebook Management via PDSCH Group Toggle Bits
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Solution Overview
Problem
Current communication systems, particularly in the context of LTE and emerging New Radio (NR) standards, face challenges in efficiently managing and reporting Hybrid Automatic Repeat Request (HARQ) acknowledgments (ACK) information across different scenarios, such as enhanced Mobile BroadBand (eMBB), massive Machine Type Communication (mMTC), and Ultra Reliable and Low Latency Communication (URLLC), due to complexities in scheduling and multiplexing HARQ-ACK information on PUCCH/PUSCH channels.
Innovation Solution
The solution involves a terminal apparatus and base station apparatus configuration that allows for efficient reception and transmission of HARQ-ACK information by scheduling PDCCH and PDSCH using specific values and toggle bits, enabling multiplexing and reporting of HARQ-ACK information on PUCCH/PUSCH channels based on distinct scenarios, and managing HARQ-ACK codebooks dynamically according to PDSCH group IDs and toggle states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If HARQ-ACK information is multiplexed on PUCCH/PUSCH channels for multiple PDSCH groups, then communication efficiency is improved, but the complexity of managing and reporting HARQ-ACK information increases
Solution Approach 1:
The patent divides PDSCH resources into multiple groups (PDSCH group #0 and PDSCH group #1) with separate HARQ-ACK codebooks for each group. This segmentation allows independent management of HARQ-ACK information for different PDSCH groups, reducing the overall complexity while enabling efficient multiplexing on PUCCH/PUSCH channels.
Solution Approach 2:
The patent introduces dynamic toggle bits (e.g., NFI bit) that can switch between different HARQ-ACK codebook configurations. The terminal apparatus dynamically selects between semi-static and dynamic codebook generation modes based on the toggle bit state, allowing flexible adaptation to different communication scenarios and reducing management complexity.
2Adaptability or versatility
If multiple PDCCHs schedule multiple PDSCHs with different values, then scheduling flexibility is improved, but the difficulty of detecting and measuring HARQ-ACK information increases
Solution Approach 1:
The patent assigns different PDSCH group IDs to different PDSCH resources scheduled by multiple PDCCHs. Each PDSCH group has its own local HARQ-ACK codebook with specific detection rules. This local quality approach simplifies detection by allowing the receiver to process HARQ-ACK information for each group separately rather than handling all PDSCHs uniformly.
Solution Approach 2:
The patent introduces PDSCH group ID as an intermediary parameter that links multiple PDCCHs to their corresponding HARQ-ACK codebooks. The group ID acts as a mediator that organizes the relationship between downlink assignments and uplink acknowledgments, making detection and measurement more manageable.
3Productivity
If HARQ-ACK codebook is dynamically updated based on toggle bits, then communication efficiency is improved, but the device complexity increases
Solution Approach 1:
The patent uses periodic toggle bits (NFI bits) that are updated at regular intervals to trigger HARQ-ACK codebook refreshes. This periodic action allows the system to maintain up-to-date codebooks without continuous complex management, as the toggle mechanism automatically initiates codebook updates at predetermined intervals.
Solution Approach 2:
The terminal apparatus automatically manages its own HARQ-ACK codebooks using the toggle bit mechanism. When a toggle bit changes state, the terminal self-service updates the corresponding codebook without requiring external intervention or complex coordination with the base station, reducing overall system complexity while maintaining efficiency.
Data Source
AI summary
A terminal apparatus receives a PDCCH and receive a PDSCH scheduled by the PDCCH, and transmits (reports), via a PUCCH or a PUSCH, HARQ-ACK information corresponding to the PDSCH. Based at least on the PDCCH, a PDSCH group ID and a toggle bit corresponding to the PDSCH group ID are indicated. In a case that the toggle bit is toggled, HARQ-ACK information being already reported (the HARQ-ACK information other than HARQ-ACK information not being reported yet) is deleted from an HARQ-ACK codebook corresponding to the PDSCH group ID. The HARQ-ACK information corresponding to the PDSCH scheduled by the PDCCH is included in the HARQ-ACK codebook.