Uplink HARQ-ACK Codebook Handling for SPS PDSCH Feedback
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Solution Overview
Problem
The existing mobile communication systems face challenges in managing the explosive data traffic, high transmission rates, large numbers of connected devices, low latency, and energy efficiency, particularly in determining Hybrid Automatic Repeat and reQuest-Acknowledgment (HARQ-ACK) codebooks for semi-persistent scheduling (SPS) Physical Downlink Shared Channels (PDSCHs).
Innovation Solution
A method and apparatus for uplink transmission and reception in wireless communication systems that determine HARQ-ACK information by excluding SPS PDSCHs with disabled HARQ processes, clarifying the HARQ-ACK codebook configuration based on the activation status of HARQ processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If HARQ-ACK information for all SPS PDSCHs is multiplexed by appending to pre-configured HARQ-ACK information, then the completeness of HARQ-ACK feedback is improved, but the complexity of HARQ-ACK codebook determination increases due to ambiguity when HARQ processes are disabled
Solution Approach 1:
The patent extracts and excludes SPS PDSCHs associated with disabled HARQ processes from the HARQ-ACK codebook. When determining the HARQ-ACK codebook, the terminal identifies which HARQ processes are disabled and removes the corresponding SPS PDSCH entries, preventing ambiguity while maintaining feedback for active processes.
Solution Approach 2:
The patent introduces dynamic adjustment of the HARQ-ACK codebook based on the activation status of HARQ processes. The codebook configuration changes dynamically according to which HARQ processes are currently enabled or disabled, allowing flexible adaptation to different operational states without fixed complexity.
2Productivity
If HARQ-ACK codebook configuration is optimized by excluding disabled HARQ processes, then the efficiency of uplink control information transmission is improved, but the risk of incomplete feedback for all received PDSCHs increases
Solution Approach 1:
The patent selectively extracts only the necessary HARQ-ACK feedback elements corresponding to enabled HARQ processes. By removing disabled process entries from the codebook configuration, it reduces overhead and improves transmission efficiency while preserving all necessary feedback for actually received and processed PDSCHs.
Solution Approach 2:
The patent changes the parameters of the HARQ-ACK codebook configuration based on the operational state of HARQ processes. When HARQ processes are disabled, the codebook parameters are adjusted to reflect only the active processes, optimizing the feedback mechanism for current system conditions without compromising necessary coverage.
Data Source
AI summary
A method and an apparatus of uplink transmission and reception in a wireless communication system is disclosed. A method of transmitting uplink control information by a terminal in a wireless communication system according to an embodiment of the present disclosure may include receiving, from a base station, a plurality of physical downlink shared channels (PDSCHs); and transmitting, to the base station, the uplink control information including Hybrid Automatic Repeat and reQuest-Acknowledgment (HARQ-ACK) information based on the plurality of PDSCHs. Here, the plurality of PDSCHs include a plurality of semi-persistent scheduling (SPS) PDSCHs, and based on HARQ-ACK information for the plurality of SPS PDSCHs being multiplexed by appending to pre-configured HARQ-ACK information, the HARQ-ACK information included in the uplink control information is determined by excluding at least one SPS PDSCH associated with a disabled HARQ process among the plurality of SPS PDSCHs.