HARQ-ACK Codebook Cancellation for Wireless Feedback
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Solution Overview
Problem
In LTE communication systems, efficient retransmission control of data is hindered by the lack of appropriate feedback mechanisms between the data transmitting and receiving sides, leading to suboptimal data reception and error detection, which affects overall communication efficiency.
Innovation Solution
A terminal device and communication method that trigger the transmission of HARQ-ACK codebooks, canceling the first HARQ-ACK codebook if a second is triggered before it has been transmitted, and define relationships between HARQ processes and PDSCH slots, ensuring efficient retransmission control based on HARQ process sets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple HARQ-ACK codebooks are transmitted to provide comprehensive feedback for retransmission control, then the reliability of data transmission is improved, but the transmission timing and resource management become more complex
Solution Approach 1:
The patent implements dynamic codebook cancellation where the terminal device monitors for cancellation indications between codebook transmissions. When a cancellation indication is received, the terminal device dynamically adjusts by canceling the pending first HARQ-ACK codebook and transmitting only the second HARQ-ACK codebook. This dynamic adjustment mechanism resolves the contradiction by providing flexible control over codebook transmission based on real-time channel conditions and feedback requirements.
2Speed
If HARQ-ACK codebook transmission is triggered frequently to ensure timely feedback, then the responsiveness of retransmission control is improved, but the risk of conflicting transmissions and resource waste increases
Solution Approach 1:
The patent employs preliminary anti-action through the cancellation mechanism. Before the first HARQ-ACK codebook is transmitted, the system checks for cancellation indications. If a cancellation indication is present, the first codebook transmission is preemptively canceled, preventing resource waste from conflicting transmissions. This preliminary check and cancel action resolves the contradiction by maintaining frequent feedback triggering while preventing unnecessary transmissions that would waste resources.
3Measurement precision
If the terminal device monitors and processes cancellation indications between codebook transmissions, then the accuracy of feedback transmission is improved, but the processing time and operational complexity increase
Solution Approach 1:
The patent applies preliminary action by having the terminal device monitor for cancellation indications in advance, before the first HARQ-ACK codebook transmission occurs. This preliminary monitoring allows the terminal device to determine early whether the first codebook should be canceled, enabling accurate feedback transmission decisions to be made beforehand. This resolves the contradiction by improving transmission accuracy through advance monitoring while managing operational complexity through a structured monitoring-and-decide process.
Data Source
AI summary
A communication method used for a terminal device is provided. The communication method comprises triggering transmission of a first hybrid automatic repeat request acknowledgement (HARQ-ACK) codebook; and when transmission of a second HARQ-ACK codebook is triggered before the first HARQ-ACK codebook has been transmitted, canceling the transmission of the first HARQ-ACK codebook; and transmitting the second HARQ-ACK codebook.