DCI-Based HARQ Feedback Control for Flexible Terminal Scheduling
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Solution Overview
Problem
Current communication systems inflexibly mandate HARQ feedback based on RRC configuration, failing to accommodate varying data transmission reliability requirements of different services.
Innovation Solution
A method and apparatus that allow a terminal device to determine HARQ feedback flexibility by parsing DCI for specific instructions, enabling independent control of HARQ feedback without constant reliance on RRC configuration, using predefined or indicated information to parse DCI for flexible HARQ feedback management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal device constantly performs HARQ feedback based on RRC configuration message, then data transmission reliability is improved, but flexibility is worsened
Solution Approach 1:
The patent applies dynamics by transitioning from a static RRC configuration-based HARQ feedback mechanism to a dynamic DCI-based control mechanism. The network can dynamically adjust HARQ feedback requirements on a per-scheduling basis through DCI fields, allowing the system to adapt between high reliability modes (when feedback is required) and flexible modes (when feedback can be omitted), thus resolving the contradiction between reliability and flexibility.
Solution Approach 2:
The patent changes the control parameter from RRC configuration messages to DCI fields. By introducing a new field in the DCI that indicates whether HARQ feedback is required, the system can change the feedback parameter dynamically based on service requirements. This parameter change enables the terminal to adjust its behavior from constant feedback to conditional feedback, improving both reliability when needed and flexibility when not required.
2Adaptability or versatility
If the terminal device constantly does not perform HARQ feedback, then flexibility is improved, but data transmission reliability is worsened
Solution Approach 1:
The patent changes the control parameter from RRC configuration messages to DCI fields. By introducing a new field in the DCI that indicates whether HARQ feedback is required, the system can change the feedback parameter dynamically based on service requirements. This parameter change enables the terminal to adjust its behavior from constant feedback to conditional feedback, improving both reliability when needed and flexibility when not required.
3Ease of manufacture
If RRC configuration message is used to indicate HARQ feedback requirement, then configuration simplicity is improved, but signaling overhead is worsened
Solution Approach 1:
The patent extracts the HARQ feedback control function from the RRC configuration message and places it within the DCI. By taking out this specific control information and embedding it in the DCI, the system avoids the need for separate RRC reconfiguration signaling for each HARQ feedback requirement change. This extraction reduces signaling overhead while maintaining configuration simplicity, as the terminal can determine feedback requirements directly from the DCI without additional RRC signaling.
Data Source
AI summary
A terminal device may parse first downlink control information (DCI) from a network device based on a parsing manner of DCI, to determine whether to perform HARQ feedback. The terminal device may determine, based on DCI, whether to perform the HARQ feedback, and does not need to constantly determine, based on an RRC configuration message, whether to perform the HARQ feedback, so that the HARQ feedback is more flexible. In addition, a terminal device that does not support RRC reconfiguration may also determine, based on DCI, whether to perform the HARQ feedback.