Multi-Band LBT Channel Access for Partial Bandwidth Transmission
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently performing channel access procedures in unlicensed high-frequency bands, particularly in coexistence with other communication systems, without causing interference.
Innovation Solution
A method involving listen before talk (LBT) procedures for multiple bandwidths, with dynamic or semi-static signaling for bandwidth allocation, and configuration of energy detection thresholds and maximum output power based on bandwidth size, to optimize channel access in unlicensed bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single LBT procedure is performed for the entire bandwidth, then the channel access procedure is simple, but the system cannot efficiently adapt to partial bandwidth availability and coexisting systems
Solution Approach 1:
The patent divides the entire second bandwidth into multiple first bandwidths and performs separate LBT procedures for each first bandwidth corresponding to allocated resource blocks. This segmentation allows the system to access channel resources more granularly and efficiently, improving channel access productivity while managing complexity through structured resource allocation.
2Measurement precision
If the energy detection threshold is set high to detect weak signals from coexisting systems, then coexistence detection capability is improved, but interference from strong signals cannot be effectively managed
Solution Approach 1:
The patent dynamically adjusts the energy detection threshold based on the detected signal strength. When a strong signal is detected, the threshold is increased to prevent false detection and manage interference. When weak signals are detected, the threshold is lowered to improve detection accuracy. This adaptive parameter adjustment resolves the contradiction between detecting weak signals and managing strong signal interference.
3Reliability
If the maximum output power is increased to improve transmission reliability, then signal reliability is improved, but interference to coexisting systems increases
Solution Approach 1:
The patent applies different output power levels to different first bandwidths based on local channel conditions and detected signal strengths. In bandwidths with weak or no detected signals, higher output power is used to improve reliability. In bandwidths with strong detected signals, lower output power is used to minimize interference. This local quality adjustment resolves the contradiction between transmission reliability and interference management.
Data Source
AI summary
Disclosed is a method for transmitting a signal by an apparatus in a wireless communication system. In particular, the method may be characterized by: performing a first listen before talk (LBT) for the entire second bandwidth including a plurality of first bandwidths; on the basis of the first LBT having succeeded, transmitting the signal via the second bandwidth; on the basis of the first LBT having failed, performing a second LBT for at least one first bandwidth that is some of the plurality of first bandwidths; and on the basis of the second LBT having succeeded, transmitting the signal via the at least one first bandwidth.