Uplink Transmission Resource Selection in Unlicensed Spectrum
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In wireless communication systems, particularly in scenarios where Listen Before Talk (LBT) is applied, UE faces challenges in determining the appropriate time-frequency resources for uplink transmission when receiving mixed downlink signalings indicating both LBT and no-LBT, leading to complexities in ensuring correct reception of HARQ-ACK information and optimizing transmission reliability and timeliness.
Innovation Solution
A method where a UE receives multiple downlink signalings indicating different time-frequency resources, determines the resources requiring no listening, and transmits target information in a predefined criterion-based target time-frequency resource, ensuring correct reception and optimizing uplink transmission by simplifying channel assessment and selecting resources with good channel conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the UE receives multiple downlink signalings indicating both LBT and no-LBT resources, then the UE can utilize more time-frequency resources for uplink transmission, but it becomes complex to determine which resources require listening and which do not
Solution Approach 1:
The patent segments the downlink signalings into two distinct categories: those indicating LBT resources and those indicating no-LBT resources. By separating the resource types based on the downlink signaling characteristics, the UE can independently process and determine the listening requirement for each resource without confusion, thus reducing the complexity of channel assessment while maintaining high resource utilization.
2Reliability
If the UE performs LBT before uplink transmission, then the transmission reliability is improved by avoiding interference, but the transmission delay increases due to the additional listening time
Solution Approach 1:
The patent dynamically adjusts the LBT requirement based on the downlink signaling indication. For no-LBT resources, the UE can transmit immediately without performing LBT, reducing transmission delay. For LBT resources, the UE performs LBT to ensure reliable transmission by avoiding interference. This dynamic adaptation allows the system to optimize the trade-off between reliability and delay according to the specific resource characteristics.
3Productivity
If the UE transmits uplink information in resources indicated by downlink signalings, then the system achieves efficient resource allocation, but the UE faces difficulty in selecting the target resource when multiple resources are indicated with different LBT requirements
Solution Approach 1:
The patent enables the UE to autonomously determine the LBT requirement for each uplink resource based on the corresponding downlink signaling indication. The UE self-services by automatically identifying which resources require listening and which do not, without requiring additional complex scheduling instructions from the base station. This self-determination mechanism simplifies the resource selection process while maintaining efficient resource allocation.
Data Source
AI summary
The disclosure provides a method and a device in a User Equipment (UE) and a base station for wireless communication. The UE first receives K downlink signalings, the K downlink signalings indicating K time-frequency resources respectively; then the UE determines K1 time-frequency resource(s) from the K time-frequency resources, only the K1 time-frequency resource(s) among the K time-frequency resources needing no listening before wireless transmission therein; and finally the UE transmits target information in a target time-frequency resource; wherein the target time-frequency resource is one of the K1 time-frequency resource(s) determined according to a predefined criterion, and the K time-frequency resources are all deployed on unlicensed spectrum. The disclosure transmits the target information in the target time-frequency resource by designing a predefined criterion, improving the reliability of transmission of uplink channel in unlicensed spectrum scenarios, particularly the reliability of transmission of uplink control information.