HARQ-ACK Codebook Segmentation for Multi-Cell Wireless Scheduling
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing wireless communication systems face inefficiencies in transmitting and receiving data channels and control channels, particularly in the context of code block group (CBG)-based transmissions, leading to increased overhead and suboptimal retransmission processes.
Innovation Solution
A method for generating a HARQ-ACK bit sequence in user equipment configured for CBG-based transmission, minimizing downlink control information overhead and optimizing retransmission signaling through efficient signaling in fallback modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple downlink component carriers are aggregated to increase data transmission capacity, then system throughput is improved, but the complexity of HARQ-ACK signal generation and transmission increases
Solution Approach 1:
The patent segments the HARQ-ACK codebook into multiple parts (first HARQ-ACK codebook and second HARQ-ACK codebook) based on different transmission schemes (e.g., spatial multiplexing vs. other schemes). Each segment is generated and transmitted separately, reducing the complexity of generating and managing a single large codebook for all component carriers.
Solution Approach 2:
The patent introduces a new dimension for organizing HARQ-ACK information by creating separate codebooks for different transmission schemes rather than using a single flat codebook structure. This dimensional organization allows the system to handle multiple component carriers more efficiently by grouping ACK/NACK bits according to their transmission scheme characteristics.
2Reliability
If HARQ-ACK bits for all component carriers are included in a single codebook, then acknowledgment coverage is improved, but the size of the codebook increases leading to higher overhead
Solution Approach 1:
The patent divides the HARQ-ACK codebook into multiple segments (first and second codebooks) corresponding to different transmission schemes. This segmentation reduces the size of each individual codebook while ensuring that all component carriers are still acknowledged across the segmented structure, thereby maintaining coverage while reducing overhead.
Solution Approach 2:
The patent applies partial action by creating separate codebooks only for specific transmission schemes that require them, rather than creating a single comprehensive codebook for all schemes. This allows the system to optimize the codebook size for each transmission scheme independently, reducing overall overhead while maintaining necessary acknowledgment coverage.
3Adaptability or versatility
If different transmission schemes are used across component carriers to optimize performance, then system adaptability is improved, but the complexity of identifying and managing transmission schemes increases
Solution Approach 1:
The patent segments the HARQ-ACK codebook generation process according to transmission scheme types. The UE identifies transmission schemes for each component carrier and generates separate codebook segments for different schemes (e.g., spatial multiplexing vs. other schemes). This segmentation simplifies the management of multiple transmission schemes by treating each scheme type independently.
Solution Approach 2:
The patent applies local quality by allowing different parts of the system (different codebook segments) to have different properties optimized for their specific transmission schemes. Each codebook segment is generated with characteristics suited to its corresponding transmission scheme, enabling optimized performance for each scheme while simplifying overall management through localized handling.
Data Source
Figure 1
Figure 2
Figure 3
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.