Type-1 HARQ-ACK Codebook for Multi-PDSCH Slot Offset Mapping
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing hybrid automatic repeat request-acknowledgment (HARQ-ACK) transmissions for multiple physical downlink shared channels, particularly in 5G systems operating in higher frequency bands, which affect service provision and reliability.
Innovation Solution
A method and device for managing HARQ-ACK transmissions by using a time domain resource allocation (TDRA) table to define slot offsets and extended slot timing values, along with subcarrier spacing configurations, to enhance the HARQ-ACK codebook for physical downlink shared channels (PDSCHs) in 5G systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple PDSCHs are received via single DCI in 5G mmWave systems, then spectrum efficiency is improved, but HARQ-ACK transmission management becomes complex and unreliable
Solution Approach 1:
The patent segments the HARQ-ACK codebook into multiple codebooks, where each codebook corresponds to a specific PDSCH reception occasion. This segmentation allows the UE to manage HARQ-ACK feedback for multiple PDSCHs received via single DCI in an organized manner, reducing the complexity of tracking and transmitting acknowledgments for multiple channels while maintaining improved spectrum efficiency.
Solution Approach 2:
The patent establishes predetermined associations between PDSCH reception occasions and uplink slots for HARQ-ACK transmission before actual data transmission occurs. By pre-configuring the TDRA table and establishing slot offset relationships, the system eliminates the need for complex real-time decisions about which uplink slot to use for each PDSCH acknowledgment, thereby simplifying HARQ-ACK management while enabling efficient multi-PDSCH reception.
2Reliability
If slot timing values are extended to accommodate multiple PDSCHs, then HARQ-ACK reliability is improved, but time resource allocation becomes more complex
Solution Approach 1:
The patent creates a universal extended slot timing value configuration that serves multiple PDSCH reception occasions simultaneously. The TDRA table is configured with slot offsets that can be applied across different PDSCH occasions and corresponding uplink slots, providing a multi-functional time resource allocation mechanism that ensures reliable HARQ-ACK transmission without requiring separate complex scheduling for each occasion.
Solution Approach 2:
The patent modifies the slot timing value parameters in the TDRA table to extend the range of available uplink slots for HARQ-ACK transmission. By changing and expanding the slot offset parameter values, the system provides more time resources for reliable ACK/NACK feedback while maintaining a standardized parameter structure that avoids excessive complexity in time resource management.
3Productivity
If HARQ-ACK codebook is optimized for extended slot timing, then transmission efficiency is improved, but processing requirements increase
Solution Approach 1:
The patent performs preliminary configuration of the HARQ-ACK codebook structure and slot timing associations before actual data transmission. The TDRA table is pre-configured with slot offsets and the associations between PDSCH occasions and uplink slots are established in advance, allowing the UE to efficiently generate and transmit HARQ-ACK codebooks without complex real-time processing, thereby improving transmission efficiency while keeping processing requirements manageable.
Data Source
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AI summary
The disclosure relates to a communication method and system for converging a 5th-Generation (5G) communication system for supporting higher data rates beyond a 4th-Generation (4G) system with a technology for Internet of things (IoT). A method for generating a Type-1 hybrid automatic repeat request-acknowledgement (HARQ-ACK) codebook by gathering HARQ-ACK information of multiple PDSCHs when a terminal is scheduled with the multiple physical downlink shared channels (PDSCHs) from one piece of downlink control information (DCI) in a wireless communication system is provided. The terminal may be configured with an uplink cell and a downlink cell having different subcarrier spacings, and may generate the Type-1 HARQ-ACK codebook, based on the subcarrier spacings.