Dynamic HARQ Feedback Resource Allocation via LBT Detection
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Solution Overview
Problem
In LTE systems, terminal devices do not perform listen before talk (LBT) channel detection before sending HARQ feedback, resulting in an inflexible determination of time-frequency resource locations for feedback information, which is not compliant with regulations and affects data transmission performance.
Innovation Solution
A data transmission method that involves a terminal device receiving first and second indications from a network device to determine a resource location for sending feedback information, allowing for flexible determination of time-frequency resources and incorporating LBT channel detection to ensure channel clarity before data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the terminal device sends HARQ feedback without performing LBT channel detection, then the data transmission delay is reduced, but the resource location determination becomes inflexible and regulatory compliance is violated
Solution Approach 1:
The patent makes the HARQ feedback transmission dynamic by introducing LBT channel detection before feedback transmission. The terminal device dynamically determines whether to transmit feedback based on channel availability detection, transforming a static transmission process into a dynamic one that adapts to channel conditions. This resolves the contradiction by allowing flexible resource location determination while maintaining timely transmission when channels are clear.
Solution Approach 2:
The patent changes the transmission parameters by introducing LBT detection mechanisms that modify the feedback transmission behavior. The terminal device adjusts its transmission parameters based on channel detection results, including selecting appropriate time-frequency resources and determining transmission timing. This parameter adaptation enables both regulatory compliance and flexible resource allocation while managing transmission delays.
2Adaptability or versatility
If the terminal device performs LBT channel detection before sending HARQ feedback, then regulatory compliance is achieved and resource location flexibility is improved, but the channel contention time increases
Solution Approach 1:
The patent applies preliminary action by performing LBT channel detection before HARQ feedback transmission. The terminal device proactively checks channel availability in advance, which allows it to prepare transmission resources and determine appropriate time-frequency locations beforehand. This preliminary detection reduces uncertainty and enables more efficient subsequent transmission, balancing the additional contention time with improved resource allocation flexibility.
Solution Approach 2:
The patent implements skipping by allowing the terminal device to quickly proceed with feedback transmission when LBT detection succeeds. When the channel is detected as clear, the device rushes through the feedback transmission process without unnecessary delays, minimizing the impact of channel contention time while maintaining the flexibility benefits of LBT-based resource determination.
3Reliability
If the terminal device performs LBT channel detection before sending HARQ feedback, then regulatory compliance is achieved, but the device complexity increases
Solution Approach 1:
The patent applies self-service by enabling the terminal device to autonomously perform LBT channel detection and self-determine appropriate feedback transmission resources. The device independently assesses channel conditions and makes transmission decisions without requiring complex network coordination or additional infrastructure. This self-service approach achieves regulatory compliance while keeping the solution relatively simple and scalable.
Data Source
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AI summary
Embodiments of this application provide a data transmission method, a terminal device, and a network device. The method includes: receiving, by a terminal device, a first indication sent by a network device; receiving, by the terminal device, downlink data based on the first indication, and generating feedback information of the downlink data; receiving, by the terminal device, a second indication sent by the network device, where the second indication is used to indicate a start location of an uplink time unit; determining, by the terminal device based on the first indication and the second indication, a resource location for sending the feedback information; and sending, by the terminal device, the feedback information at the resource location. In this way, the resource location for the feedback information can be flexibly determined.