Uplink Signal Transmission in Unlicensed Bands
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Solution Overview
Problem
In wireless communication systems supporting unlicensed bands, existing methods for uplink signal transmission using Listen-Before-Talk (LBT) operations are inefficient due to the lack of effective methods for determining energy detection thresholds, leading to interference with other communication technologies like Wi-Fi.
Innovation Solution
A method where a user equipment (UE) receives an equation for calculating an energy detection threshold from a base station to perform LBT-based uplink signal transmission, and the base station receives the uplink signal after transmitting the equation, ensuring efficient LBT operations based on whether the unlicensed band is shared with different communication technologies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If LBT operation is performed without proper energy detection threshold determination, then uplink signal transmission can be attempted, but interference with other communication technologies like Wi-Fi occurs
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the energy detection threshold based on whether the unlicensed band is shared with different communication technologies. The base station determines the threshold according to the shared status and signals it to the UE, which then uses this threshold for LBT operations. This resolves the contradiction by adapting the threshold parameter to prevent interference while maintaining transmission efficiency.
2Object-affected harmful factors
If the energy detection threshold is set too low, then interference with other technologies is minimized, but uplink signal transmission opportunities are reduced
Solution Approach 1:
The patent implements dynamics by making the energy detection threshold adjustable rather than fixed. The base station determines the threshold based on the actual sharing status of the unlicensed band and dynamically signals it to the UE. This allows the system to adapt the threshold level according to environmental conditions, resolving the contradiction between minimizing interference and maintaining transmission opportunities.
3Ease of operation
If the UE autonomously determines the energy detection threshold, then transmission can proceed without base station signaling, but determination accuracy is insufficient
Solution Approach 1:
The patent introduces the base station as an intermediary that determines and signals the energy detection threshold to the UE. Instead of the UE autonomously determining the threshold with insufficient accuracy, the base station uses its broader system perspective to accurately determine the threshold and communicate it to the UE. This resolves the contradiction by having the intermediary (base station) perform the precise measurement and communication it to the end user equipment.
Data Source
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AI summary
Disclosed are a method for transmitting/receiving an uplink signal between a terminal and a base station and a device supporting same in a licensed assisted access (LAA) system in which the base station or the terminal executes listen-before-talk (LBT)-based signal transmission. Specifically, disclosed are: a method for a terminal transmitting an uplink signal by executing an uplink LBT operation which is based on LBT-related information if the base station provides the LBT-related information for the uplink LBT operation of the terminal; and a device supporting same.