Feedback Information Length Determination in Unlicensed Spectrum
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Solution Overview
Problem
In wireless communication systems using unlicensed spectrum, determining the efficient length of feedback information (ACK/NACK) to minimize unnecessary Listen Before Talk (LBT) processes while multiplexing across multiple data channels is a challenge, especially in LTE and NR systems.
Innovation Solution
A method and apparatus that determine the length of feedback information bits based on the number of Hybrid Automatic Retransmission Request (HARQ) processes and transmission resource information, allowing for efficient multiplexing and reduced resource occupancy, thereby minimizing LBT processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the receiving end multiplexes and transmits feedback information for multiple data channels, then the feedback information can be transmitted efficiently, but the bit length of the feedback information becomes difficult to determine efficiently
Solution Approach 1:
The feedback information is segmented into multiple parts, each corresponding to a specific data channel or HARQ process. The determining unit divides the feedback into separate feedback information bits, where each bit or bit group corresponds to a specific data channel's ACK/NACK status. This segmentation allows for systematic determination of the total bit length by summing the lengths of individual feedback segments.
Solution Approach 2:
The patent applies preliminary action by pre-determining the bit length allocation for feedback information based on configured parameters. The determining unit calculates the total feedback bit length in advance by considering the number of data channels and their corresponding feedback requirements, allowing the feedback transmission to proceed efficiently without on-the-fly length determination.
2Quantity of substance
If the receiving end occupies more time domain resources for feedback transmission, then more feedback information can be transmitted, but unnecessary LBT processes increase
Solution Approach 1:
The patent implements dynamics by making the feedback transmission duration adaptive rather than fixed. The determining unit calculates the minimum necessary feedback bit length based on the actual number of data channels and their feedback requirements. This dynamic approach allows the receiving end to transmit only the necessary feedback information, minimizing the time domain resources occupied and reducing unnecessary LBT processes while still conveying all required feedback.
Solution Approach 2:
The patent changes the parameter of feedback bit length dynamically based on the number of data channels and their feedback requirements. By adjusting the feedback information length parameter to match the actual transmission needs, the system optimizes the time domain resource usage and minimizes LBT processes while maintaining complete feedback information transmission.
3Reliability
If the feedback information length is determined conservatively to ensure all feedback is included, then no feedback is lost, but resource usage efficiency decreases
Solution Approach 1:
The patent applies partial action by determining the feedback bit length precisely based on the actual number of data channels and their feedback requirements, rather than using a conservative maximum. The determining unit calculates the exact minimum length needed to accommodate all feedback information, avoiding both underestimation (which would lose feedback) and overestimation (which would waste resources). This precise partial action achieves both reliability and efficiency.
Data Source
AI summary
Provided in implementations of the present disclosure are a method and device for determining a length of feedback information, and a communication apparatus. The method includes that a first node determines a number of feedback information bits according to information of a number of Hybrid Automatic Retransmission Request (HARQ) processes and information of at least one transmission resource.