HARQ-ACK Bit Deletion for Semi-Static Codebook Processing Delays
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Solution Overview
Problem
In next-generation mobile communication systems, specifically in NR, the configuration of semi-static HARQ-ACK codebooks for transmission on PUSCH is unclear, leading to potential delays in processing time, which can deteriorate communication throughput and frequency use efficiency.
Innovation Solution
A user terminal equipped with a transmitting/receiving section using both Component Carriers with different Sub-Carrier Spacings, and a control section that deletes HARQ-ACK bits corresponding to downlink shared channel candidates not meeting processing time requirements, ensuring timely transmission of semi-static HARQ-ACK codebooks on the uplink shared channel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a semi-static HARQ-ACK codebook is configured for transmission on PUSCH, then the HARQ-ACK transmission structure is simplified and resource allocation is more efficient, but processing time delays occur when downlink shared channel candidates do not meet processing time requirements
Solution Approach 1:
The patent applies dynamics by making the HARQ-ACK codebook configurable between semi-static and dynamic modes. The network can adaptively select the codebook type based on processing time requirements and traffic conditions, allowing the system to switch from semi-static (more efficient but slower processing) to dynamic (less efficient but faster processing) when processing delays occur
Solution Approach 2:
The patent changes the parameter of HARQ-ACK codebook configuration from fixed semi-static to adjustable between semi-static and dynamic modes. By modifying this configuration parameter, the system can optimize the balance between resource efficiency and processing speed according to actual network conditions
2Ease of manufacture
If a semi-static HARQ-ACK codebook is configured, then resource allocation efficiency is improved, but frequency use efficiency deteriorates due to processing time delays
Solution Approach 1:
The system dynamically adjusts the HARQ-ACK codebook configuration based on processing time requirements. When frequency use efficiency deteriorates due to processing delays, the network can switch to dynamic codebook mode or adjust timing parameters to restore efficiency
3Ease of operation
If HARQ-ACK transmission is configured without considering processing time requirements, then configuration simplicity is maintained, but communication reliability deteriorates
Solution Approach 1:
The patent implements feedback mechanisms where the network monitors processing time compliance and HARQ-ACK transmission success. Based on this feedback, the network adjusts the HARQ-ACK codebook configuration and timing parameters to maintain both simplicity and reliability
Data Source
AI summary
A user terminal according to one aspect of the present disclosure includes: a transmitting/receiving section that performs transmission and reception by using a first Component Carrier (CC) that uses a first Sub-Carrier Spacing (SCS), and a second CC that uses a second SCS larger than the first SCS; and a control section that, when a semi-static Hybrid Automatic Repeat reQuest Acknowledgement (HARQ-ACK) codebook related to both of the first CC and the second CC is transmitted on an uplink shared channel of the second CC, deletes an HARQ-ACK bit corresponding to a downlink shared channel candidate that does not satisfy a requirement of processing time. According to one aspect of the present disclosure, it is possible to appropriately transmit HARQ-ACK even when a semi-static HARQ-ACK codebook is configured.