Terminal HARQ-ACK Codebook Control for Joint SPS Release
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Solution Overview
Problem
In future radio communication systems, such as New Radio (NR), the configuration and reporting of Hybrid Automatic Repeat Request (HARQ) acknowledgments (ACK) for joint semi-persistent scheduling (SPS) releases are not clearly defined, leading to potential deterioration of communication throughput when multiple SPSs are used.
Innovation Solution
A terminal is equipped with a receiving section to receive downlink control information for releasing multiple SPSs and a control section that performs valid HARQ-ACK control, including HARQ-ACK codebook generation for downlink shared channel reception, ensuring appropriate HARQ-ACK codebook determination even during joint SPS release.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If joint SPS release is used to release multiple SPSs with one SPS release, then control flexibility is improved, but HARQ-ACK configuration becomes unclear leading to communication throughput deterioration
Solution Approach 1:
The patent segments the HARQ-ACK codebook into multiple parts, with each part corresponding to a specific SPS configuration. When joint SPS release is used, the terminal determines which part of the codebook to set based on the SPS release indication, allowing clear configuration even when multiple SPSs are released together.
Solution Approach 2:
The terminal preliminarily determines the HARQ-ACK codebook structure by associating each SPS configuration with a specific codebook part in advance. This preliminary arrangement enables the terminal to quickly and accurately determine the appropriate HARQ-ACK configuration when joint SPS release occurs, without requiring complex real-time analysis.
2Adaptability or versatility
If multiple SPSs are configured in one cell group, then scheduling flexibility is improved, but HARQ-ACK codebook determination becomes complex
Solution Approach 1:
The patent divides the HARQ-ACK codebook into multiple distinct parts, where each part is associated with a specific SPS configuration. This segmentation allows the terminal to handle multiple SPSs independently within a single cell group, determining the appropriate codebook part based on which SPS is being released, thereby managing complexity through structured organization.
Solution Approach 2:
The patent introduces an intermediary mapping relationship between SPS configurations and HARQ-ACK codebook parts. This intermediary structure acts as a bridge, allowing the terminal to translate joint SPS release indications into specific codebook configurations without directly managing the complexity of multiple SPSs simultaneously.
3Productivity
If joint SPS release is implemented, then release efficiency is improved, but HARQ-ACK reporting clarity deteriorates
Solution Approach 1:
The patent segments the HARQ-ACK codebook into multiple parts, each corresponding to a specific SPS configuration. When joint SPS release is used, the terminal can clearly determine which codebook part to set by referencing the segmented structure, ensuring that HARQ-ACK reporting remains clear and unambiguous even when multiple SPSs are released simultaneously.
Solution Approach 2:
The terminal preliminarily establishes the mapping between SPS configurations and codebook parts before joint SPS release occurs. This preliminary action enables the terminal to quickly and accurately determine the appropriate HARQ-ACK configuration when release is commanded, maintaining reporting clarity while benefiting from the efficiency of joint release.
Data Source
AI summary
A terminal according to an aspect of the present disclosure includes: a receiving section that receives downlink control information for releasing a plurality of semi-persistent schedulings (SPSs); and a control section that performs control of including a valid Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK) corresponding to the downlink control information at at least one of a plurality of positions of HARQ-ACKs corresponding to downlink shared channel (Physical Downlink Shared Channel (PDSCH)) reception of the plurality of SPSs in a semi-static HARQ-ACK codebook. According to an aspect of the present disclosure, the HARQ-ACK codebook can be appropriately determined even when joint SPS release is used.