Wireless Feedback Process Segmentation for NR-U Delay Reduction
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Solution Overview
Problem
In wireless communications, particularly in NR-based access to unlicensed spectrum, there is a delay in determining the receipt of downlink data by network devices due to terminal devices failing to send feedback information in time or network devices not demodulating it promptly, leading to increased transmission delays and resource wastage.
Innovation Solution
Implementing a method where network devices indicate terminal devices to use different feedback processes for sending feedback information, allowing for scheduling of next downlink data without waiting for the completion of previous feedback processing, and using new feedback indicators to manage retransmissions and resource allocation efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the network device waits for feedback information to be successfully received and demodulated before scheduling next downlink data, then the feedback information can be reliably processed, but the transmission delay increases
Solution Approach 1:
The patent divides the feedback processing into separate feedback processes (first feedback process and second feedback process) that operate independently. This allows the network device to schedule next downlink data using the first feedback process without waiting for completion of the second feedback process, thereby reducing transmission delay while maintaining reliable feedback processing through parallelization
Solution Approach 2:
The network device performs preliminary scheduling of next downlink data before the current feedback information is fully processed. By preparing the scheduling decision in advance and using multiple feedback processes, the system can move forward with data transmission without being blocked by ongoing feedback demodulation, thus reducing delay while ensuring feedback reliability
2Reliability
If the network device indicates terminal device to retransmit feedback information when not received, then feedback reliability is improved, but air interface resources are wasted due to terminal device not knowing previous feedback status
Solution Approach 1:
The patent segments feedback information into different feedback processes with independent status tracking. Each feedback process maintains its own reception status, allowing the network device to precisely identify which feedback processes need retransmission. This prevents unnecessary retransmissions of successfully received feedback, thereby reducing air interface resource wastage while maintaining reliability
Solution Approach 2:
The network device uses feedback indicators in downlink control information to communicate the reception status of feedback processes to the terminal device. This feedback mechanism allows the terminal to understand which feedback processes were successfully received and which need retransmission, preventing redundant transmissions and optimizing air interface resource utilization
Data Source
AI summary
A communications device to which the foregoing methods are applied sends or receives feedback information by using different feedback processes. When a network device does not determine whether a previous piece of feedback information is successfully received, the network device indicates a terminal device to send feedback information of a next piece of downlink data by using a new feedback process, and can schedule the next piece of downlink data without waiting for completion of processing of the previous piece of feedback information.