Unlicensed FRX Channel Access Mode Selection for LBT Flexibility
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The challenge of determining appropriate channel access modes for communication devices on the unlicensed spectrum in the FRX band, which includes various LBT modes such as omnidirectional LBT, directional LBT, and receiver-assisted LBT, is not clearly defined in existing communication systems.
Innovation Solution
A method and device for determining a first channel access mode for physical channels or signals on an unlicensed spectrum within a frequency range, including options like channel access without sensing, a first type of channel access, and a second type of channel access, which can be applied by terminal and network devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple LBT modes (omnidirectional, directional, receiver-assisted) are introduced for FRX band unlicensed spectrum, then channel access flexibility and adaptability are improved, but system complexity and difficulty in determining appropriate access modes increase
Solution Approach 1:
The patent segments the channel access modes into distinct categories (omnidirectional LBT, directional LBT, receiver-assisted LBT, and no LBT) with specific determination conditions for each. This segmentation allows the system to manage complexity by clearly defining when each mode should be used, thereby improving adaptability while controlling device complexity through structured decision-making frameworks.
2Ease of operation
If channel access determination rules are clearly defined for FRX band, then ease of operation and device implementation are improved, but the flexibility to handle diverse communication scenarios decreases
Solution Approach 1:
The patent implements dynamic channel access mode determination by establishing conditions that can vary based on communication scenarios. The system dynamically selects between different LBT modes (omnidirectional, directional, receiver-assisted, or no LBT) based on factors such as communication distance, interference levels, and network configuration, thereby maintaining ease of implementation through clear rules while preserving flexibility for diverse scenarios.
3Reliability
If channel sensing is performed for all physical channels on unlicensed spectrum, then communication reliability is improved, but time consumption and productivity decrease
Solution Approach 1:
The patent applies local quality by differentiating channel access requirements for different physical channels and signal types. Instead of uniformly applying channel sensing to all channels, the system determines appropriate access modes based on local characteristics of each channel (e.g., uplink channels, downlink channels, sidelink channels), thereby maintaining communication reliability for critical channels while improving time efficiency for channels where sensing is less critical or can be performed with modified parameters.
Data Source
AI summary
A channel access method includes: determining, by a terminal device, a first channel access mode corresponding to a first physical channel or physical signal. The first physical channel or physical signal includes an uplink physical channel or physical signal on a first carrier, and/or the first physical channel or physical signal includes a sidelink physical channel or physical signal on the first carrier. The first carrier is on an unlicensed spectrum within a first frequency range. The first channel access mode includes one of: a channel access without channel sensing, a channel access of a first type, and a channel access of a second type.