LBT Priority Class Determination for Unlicensed Spectrum Access
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In wireless communication systems, particularly in LTE-U and LAA, there is a lack of defined methods for user equipment (UE) to determine channel access priority classes for uplink transmission in unlicensed bands, which is essential for efficient channel access and data transmission.
Innovation Solution
A method for a UE to determine a listen-before-talk (LBT) priority class by receiving mapping information from the network and selecting the appropriate class based on logical channels with data to be transmitted, either by choosing a single class if all channels belong to the same class or selecting a representative channel if multiple classes are involved, to perform the LBT procedure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a UE performs LBT procedure in unlicensed band, then channel access is enabled, but the method for determining LBT priority class is not defined
Solution Approach 1:
The UE autonomously determines its LBT priority class by evaluating the buffer status of logical channels and mapping them to priority classes based on predefined rules, without requiring network configuration or additional signaling
Solution Approach 2:
The LBT priority class is dynamically selected based on changing buffer status parameters of logical channels, allowing the UE to adapt the priority class according to current data transmission needs
2Adaptability or versatility
If multiple logical channels with different priority classes exist, then data transmission flexibility is improved, but LBT procedure complexity increases
Solution Approach 1:
The LBT procedure is segmented into distinct steps: buffer status evaluation, priority class determination based on logical channel mapping, and execution of LBT with selected priority class parameters
Solution Approach 2:
The UE pre-establishes mapping relationships between logical channels and LBT priority classes, and pre-evaluates buffer status before LBT execution, preparing the optimal priority class in advance
Data Source
AI summary
Provided are a method for determining a listen-before-talk (LBT) priority class by a terminal in a wireless communication system and a device supporting same. The terminal can receive, from a network, mapping information between a logical channel and an LBT priority class and determine a particular LBT priority class on the basis of the received mapping information and a logical channel having data to be transmitted.