LBT Scheme Selection for Unlicensed Band Uplink Efficiency
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently multiplexing radio resources based on different numerologies to meet the diverse requirements of enhanced mobile broadband, massive machine-type communication, and ultra-reliable and low-latency communication scenarios in next-generation radio access networks, particularly in unlicensed frequency bands where coexistence with other wireless protocols is necessary.
Innovation Solution
The implementation of Listen Before Talk (LBT) schemes for wireless communications over unlicensed bands, where user equipment (UE) and base stations determine an appropriate LBT scheme for transmitting uplink signals, considering whether LBT is required, whether random-back-off is needed, and the random-back-off time, to ensure efficient use of unlicensed bands and avoid interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If wireless communication is performed in unlicensed bands without LBT, then transmission efficiency is improved, but interference with other wireless services increases
Solution Approach 1:
The patent implements Listen Before Talk (LBT) mechanism where the transmitting device performs channel sensing before transmission to detect if the unlicensed band is currently occupied. This preliminary action prevents interference by identifying available channels in advance, resolving the contradiction between transmission efficiency and interference prevention.
Solution Approach 2:
The patent dynamically adjusts transmission parameters including random backoff time selection and transmit power levels based on channel conditions detected during LBT. By changing these parameters adaptively, the system optimizes transmission efficiency while maintaining acceptable interference levels to other wireless services.
2Object-affected harmful factors
If LBT with random-back-off is performed, then interference with other wireless services is reduced, but transmission delay increases
Solution Approach 1:
The patent implements a partial LBT approach where random-back-off is applied selectively rather than universally. The transmitting device performs LBT and only applies random-back-off when necessary based on channel conditions, performing partial sensing actions to reduce unnecessary delays while still preventing interference when needed.
Solution Approach 2:
The patent dynamically adjusts the LBT parameters including random-backoff range and sensing duration based on current channel conditions and traffic requirements. This dynamic adaptation allows the system to minimize transmission delay in favorable conditions while maintaining interference protection when the channel is congested.
3Productivity
If different LBT schemes are used for different numerologies, then resource multiplexing efficiency is improved, but system complexity increases
Solution Approach 1:
The patent segments the LBT mechanism into different schemes tailored for different numerologies (subcarrier spacings). Each numerology type can be associated with a specific LBT scheme, allowing optimized resource multiplexing for each scenario while managing complexity through structured segmentation of the overall system.
Solution Approach 2:
The patent creates a universal LBT framework that can accommodate multiple numerologies through a common set of procedures and parameters. The standardized LBT mechanism serves multiple functions across different numerology types, reducing overall system complexity while enabling efficient resource multiplexing across diverse service requirements.
Data Source
AI summary
Provided are a method and apparatus for performing listen before talk (LBT) by a terminal for wireless communication in an unlicensed band. The method may include: determining an LBT scheme for transmitting an uplink signal in an unlicensed band, among a plurality of LBT schemes distinguished by at least one of whether to perform LBT, whether to perform random back off, and a random back-off time; and transmitting an uplink signal in an unlicensed band according to the determined LBT scheme.