Dynamic Feedback Bit Length Determination in 5G NR CBG Transmission
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Solution Overview
Problem
In the 5G NR system, the CBG-based transmission mode transmits redundant feedback response information when the amount of data scheduled is less than the maximum amount of CBGs, reducing the efficiency of downlink control information transmission, as there is no dynamic determination method for the number of bits in the feedback response information sequence.
Innovation Solution
A method where a terminal receives configuration information to determine the largest number of feedback response information pieces corresponding to a physical shared channel, calculates the bit length of the first information field, and transmits the feedback response information sequence in a target time unit, reducing redundant bits and enabling dynamic determination of the feedback information sequence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal transmits feedback response information for the maximum number of CBGs, then the feedback coverage is complete, but redundant feedback bits are transmitted when the actual data amount is less than the maximum CBGs
Solution Approach 1:
The patent applies dynamics by making the feedback information sequence length variable rather than fixed. The terminal dynamically determines the number of feedback bits based on the actual number of CBGs scheduled in the current transmission, allowing the feedback structure to adapt to different data amounts and avoid transmitting redundant bits for unscheduled CBGs.
Solution Approach 2:
The patent changes the parameter of feedback information length from a fixed maximum value to a variable value that corresponds to the actual number of scheduled CBGs. By adjusting the feedback sequence length parameter based on the scheduling situation, the system eliminates redundant feedback bits while maintaining complete feedback coverage for all actually scheduled CBGs.
2Device complexity
If a fixed bit length is used for feedback response information, then the transmission structure is simple, but the transmission efficiency decreases when the actual data amount varies
Solution Approach 1:
The patent transforms the static feedback structure into a dynamic one where the bit length of feedback information is determined by the actual scheduling situation. The terminal calculates the required feedback length based on the number of actually scheduled CBGs, making the transmission structure adaptable to varying data amounts and improving transmission efficiency without excessive complexity.
3Reliability
If the feedback response information sequence includes all possible CBGs, then no feedback is missing, but the overhead for downlink control signaling increases
Solution Approach 1:
The patent extracts only the necessary feedback information corresponding to actually scheduled CBGs from the complete set of possible CBGs. By removing feedback bits for unscheduled CBGs, the system reduces feedback information overhead while maintaining completeness for all relevant scheduled data units.
Solution Approach 2:
Instead of transmitting feedback for all possible CBGs (excessive action), the patent transmits feedback only for the actually scheduled CBGs (partial action). This partial feedback approach is sufficient for maintaining reliability while significantly reducing the quantity of feedback information when not all CBGs are scheduled.
Data Source
AI summary
A method for transmitting feedback response information and a related product are provided. The method includes: receiving, by a terminal, configuration information from a network device; determining, by the terminal, a largest number of pieces of feedback response information corresponding to one physical shared channel according to the configuration information; determining, by the terminal, a bit length of a first information field according to the largest number of pieces of the feedback response information; determining, by the terminal, a feedback response information sequence in a target time unit according to the first information field; and sending, by the terminal, the feedback response information sequence in the target time unit.