Uplink Feedback Transmission for Collision Avoidance
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Solution Overview
Problem
In communication systems, when ACK/NACK resources corresponding to different PDSCHs are allocated to the same time-domain resource, terminal devices face challenges in avoiding collisions and reducing signaling overhead due to unclear backhaul conditions.
Innovation Solution
The method involves the terminal device determining how to transmit ACK/NACK information based on reference information, such as priority, multiplex indication, spatial relation, and panel number, to avoid collisions and reduce signaling overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If multiple pieces of ACK/NACK information are multiplexed and transmitted to the same TRP on one feedback resource, then signaling overhead is reduced, but collision of feedback information occurs when backhaul between TRPs is non-ideal
Solution Approach 1:
The patent applies dynamics by making the terminal device's transmission behavior adaptive based on detected backhaul conditions. The terminal dynamically adjusts whether to multiplex ACK/NACK information or transmit separately, depending on the quality of backhaul connectivity between TRPs. This resolves the contradiction by allowing the system to optimize between signaling overhead reduction and collision avoidance based on real-time network conditions.
Solution Approach 2:
The patent utilizes feedback mechanisms where the terminal device reports backhaul status information to the network side, and the network side provides instructions on how to handle ACK/NACK transmission. This feedback loop enables the system to dynamically adjust transmission strategies, resolving the contradiction between multiplexing benefits and collision risks by continuously monitoring and adapting to backhaul conditions.
2Reliability
If the terminal device reports only one piece of ACK/NACK information when backhaul is non-ideal, then feedback collision is avoided, but information loss occurs
Solution Approach 1:
The patent applies segmentation by dividing the ACK/NACK feedback process into multiple independent parts - separate feedback resources for different TRPs or separate feedback messages. This allows the terminal to selectively transmit ACK/NACK information from different TRPs without causing collisions, while maintaining the ability to report all necessary information through coordinated transmission strategies.
3Productivity
If ACK/NACK resources for different PDSCHs are allocated to the same time-domain resource, then resource utilization is improved, but collision risk increases
Solution Approach 1:
The patent applies merging by combining multiple ACK/NACK feedback resources into a single time-domain resource when backhaul conditions are ideal, allowing efficient resource utilization. When backhaul conditions deteriorate, the system automatically separates these merged resources to avoid collisions. This dynamic merging and separating strategy resolves the contradiction between resource efficiency and collision avoidance.
Data Source
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AI summary
Methods for uplink feedback information transmission, a terminal device, and a network device are provided. A method includes the following. A terminal device receives first downlink data and second downlink data, where a first ACK/NACK resource corresponding to first ACK/NACK information of the first downlink data and a second ACK/NACK resource corresponding to second ACK/NACK information of the second downlink data occupy the same time-domain resource. The terminal device transmits the first ACK/NACK information and/or the second ACK/NACK information on the time-domain resource. With the methods, the terminal device, and the network device above, it is possible to avoid collision of feedback information and reduce signaling overhead.