5G Feedback Information Sending Method for URLLC Reliability
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Solution Overview
Problem
In 5G wireless communications systems, particularly in ultra-reliable and low-latency communications (URLLC) scenarios, there is a challenge in efficiently identifying and retransmitting unsuccessfully decoded code blocks (CBs) within transport blocks (TBs) to maintain high reliability and low latency, as current methods struggle to differentiate between false alarms and non-false alarms, leading to inefficiencies in retransmission processes.
Innovation Solution
A feedback information sending method and device are introduced, where a receiving device sends feedback information sets that include acknowledgement (ACK) and negative acknowledgement (NACK) messages to distinguish between successfully and unsuccessfully decoded CBs, allowing the transmitting device to identify false alarms and improve retransmission efficiency by selectively retransmitting only necessary CBs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the receiving device checks each CB independently and sends feedback for each CB, then the retransmission efficiency can be improved, but the feedback information overhead and processing complexity increase
Solution Approach 1:
The patent segments the feedback information into two distinct parts: CB-level feedback (indicating successful decoding of individual code blocks) and TB-level feedback (indicating overall transport block validation status). This segmentation allows the system to maintain detailed tracking of individual CB decoding status while managing feedback complexity through structured organization, thereby improving retransmission efficiency without overwhelming processing complexity.
2Measurement precision
If the receiving device sends detailed feedback for each CB decoding status, then false alarms can be identified, but the feedback information size and transmission overhead increase
Solution Approach 1:
The patent extracts the TB-level validation result as a separate feedback element distinct from individual CB decoding status reports. By taking out the overall TB check result and treating it independently from CB-level feedback, the system can identify false alarms (cases where individual CBs pass checks but the overall TB is invalid) without requiring excessive detailed feedback for every possible error condition, thus reducing feedback overhead while maintaining detection accuracy.
3Reliability
If the transmitting device retransmits all CBs in a TB when any CB fails decoding, then reliability is maintained, but the retransmission latency increases
Solution Approach 1:
The patent implements dynamic retransmission decision-making where the transmitting device adjusts retransmission behavior based on received feedback patterns. When CB-level feedback indicates successful decoding of individual CBs, the system dynamically selects only the failed CBs for retransmission rather than retransmitting the entire TB. This dynamic approach maintains reliability by ensuring all necessary CBs are retransmitted while minimizing latency by avoiding unnecessary retransmission of successfully decoded data.
Data Source
AI summary
Feedback information sending methods and devices are disclosed. One method includes: transmit, during a first time period, a transport block (TB) to a terminal device, in response to determining that the one or more first CBGs are correctly decoded and the one or more second CBGs are incorrectly decoded, retransmit, during a second time period after the first time period, the one or more second CBGs that are incorrectly decoded, and receive, during a third time period after the second time period, feedback information, wherein the feedback information comprises one or more first decoding statuses respectively corresponding to the one or more first CBGs that are transmitted during the first time period and one or more second decoding statuses respectively corresponding to the one or more second CBGs that are retransmitted during the second time period.