Uplink Control Information Transmission Timing in Unlicensed Spectrum
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In wireless cellular systems using unlicensed frequency bands, there is a recurring issue of time resource collisions between uplink control information and downlink data, leading to potential discarding of uplink control information and inefficiencies in data transmission.
Innovation Solution
A method where a terminal determines a third time resource for transmitting uplink control information, which is located after a second time resource for downlink data transmission and has a preset time interval with it, ensuring that uplink control information is not discarded and reducing unnecessary Listen Before Talk processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If uplink control information is transmitted according to a predetermined period on an unlicensed frequency band, then the transmission timing is regular and predictable, but time resource collision with downlink burst data occurs
Solution Approach 1:
The patent applies dynamics by making the uplink control information transmission timing flexible rather than fixed. The terminal determines the actual transmission time based on whether the resource coincides with downlink burst data transmission, allowing the system to adapt between periodic scheduling and collision avoidance modes.
Solution Approach 2:
The patent applies preliminary action by having the terminal check in advance whether the predetermined uplink transmission time resource coincides with downlink burst data transmission before actually transmitting. This advance detection prevents collision before it occurs.
2Productivity
If uplink control information is discarded due to time resource collision, then downlink data transmission is maintained, but uplink control information is lost and transmission efficiency decreases
Solution Approach 1:
The patent introduces a time resource determination mechanism as an intermediary between the periodic uplink control information scheduling and the dynamic downlink burst data transmission. This intermediary checks for conflicts and adjusts timing to prevent information loss while maintaining downlink efficiency.
3Reliability
If Listen Before Talk detection is performed frequently to avoid collisions, then collision avoidance improves, but transmission delays increase and efficiency decreases
Solution Approach 1:
The patent applies preliminary action by performing a single advance check of time resource coincidence between uplink control information and downlink burst data before transmission. This eliminates the need for repeated Listen Before Talk detections, reducing transmission delays while maintaining collision avoidance.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
Embodiments of the present invention provide a method for sending uplink control information, and a terminal. The method comprises: determining (310), by a terminal, a first time resource for transmitting first uplink control information; determining (330), by the terminal, a third time resource for transmitting the first uplink control information, wherein the first time resource comprises downlink time resource, and the third time resource is located after the downlink time resource; and in case that the third time resource comprises a time resource for transmitting second uplink information, transmitting, by the terminal, the first uplink control information and the second uplink information by multiplexing via the third time resource.