Downlink Control Signaling Feedback Mechanism for 5G NR Reliability
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Solution Overview
Problem
In the LTE and 5G NR systems, the base station lacks direct and accurate confirmation of whether a terminal has received downlink control signaling, leading to unreliable communication and potential errors in subsequent control signaling configurations.
Innovation Solution
The method involves the base station sending a downlink control signaling that indicates whether the terminal needs to feedback an acknowledgement message, allowing the base station to directly and accurately confirm reception, by configuring a preset bit or pre-configuring information for acknowledgement, and allocating resources for feedback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the base station uses indirect methods (checking uplink data or ACK/NACK for downlink data) to determine DCI reception, then the system maintains simplicity, but the reliability of confirming DCI reception is low
Solution Approach 1:
The patent implements a feedback mechanism where the terminal sends an acknowledgement message (ACK) to the base station to confirm successful reception of DCI. The base station configures feedback resources and receives the ACK message, enabling direct and reliable confirmation of DCI reception status, thereby resolving the reliability issue while maintaining manageable system complexity through standardized feedback procedures
Solution Approach 2:
The base station performs preliminary configuration of feedback resources (time-frequency resources, resource indicators) before the terminal needs to send the ACK message. This preliminary action ensures that when DCI reception confirmation is needed, the feedback path is already established and configured, enabling reliable confirmation without adding complex real-time decision-making to the system
2Measurement precision
If the base station requires ACK feedback for all DCI, then reception confirmation is accurate, but system overhead and complexity increase
Solution Approach 1:
The patent applies local quality by making the ACK feedback requirement specific to certain DCI types or situations rather than universal. The base station can selectively require ACK feedback for critical DCI (e.g., those carrying important scheduling information) while allowing other DCI to be confirmed through indirect methods, thus achieving accurate confirmation where needed without unnecessary feedback overhead
Solution Approach 2:
The system changes the parameter of feedback requirement dynamically based on DCI content, terminal capability, or network conditions. The base station can adjust whether ACK feedback is required by modifying DCI format or associated RRC configuration parameters, enabling accurate confirmation when necessary while reducing feedback quantity under normal conditions
Data Source
AI summary
The embodiments of the present disclosure disclose a control signaling transmission method, a base station and a terminal, the method includes: sending, by a base station, a first downlink control signaling to a terminal, and indicating, through the first downlink control signaling, whether the terminal needs to feed back an acknowledgement message corresponding to a reception of the first downlink control signaling; and receiving the acknowledgement message fed back by the terminal if the base station indicates that the terminal needs to feed back the acknowledgement message corresponding to the reception of the first downlink control signaling. The embodiments of the present disclosure can ensure that the base station knows the reception of important control signaling in time, facilitate the configuration and transmission of subsequent control signaling, and improve the reliability of a 5G NR system.