Unlicensed Spectrum Access via Dual RAT Transmission Indicators
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Solution Overview
Problem
Wireless communication systems face challenges in efficiently utilizing unlicensed radio frequency spectrum bands due to interference and contention issues between different radio access technologies, leading to unequal access and reduced communication quality.
Innovation Solution
A method where devices transmit specific indicators, such as Wi-Fi preambles and channel usage beacon signals, to determine spectrum availability and selectively contend or transmit, based on the type of source device and network operator, using clear channel assessment and carrier sense multiple access procedures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If devices transmit multiple transmission indicators (Wi-Fi preamble and channel usage beacon signal) to indicate spectrum availability, then access fairness and efficiency are improved, but device complexity and transmission overhead increase
Solution Approach 1:
The patent combines Wi-Fi preamble transmission with LTE channel usage beacon signals into a unified transmission mechanism. The LTE device transmits both indicators simultaneously or in coordinated sequence, merging the functionality of two separate indication systems into a single coordinated transmission process, thereby improving spectrum access efficiency while managing device complexity through integrated control
Solution Approach 2:
The transmission indicator mechanism is designed to serve multiple radio access technologies (both Wi-Fi and LTE) simultaneously. A single transmission infrastructure carries dual-purpose signals that can be interpreted by both Wi-Fi and LTE devices, making the system universally applicable across different RATs and improving overall spectrum utilization efficiency
2Object-affected harmful factors
If devices perform clear channel assessment and detect preambles from different RATs, then interference reduction is improved, but detection precision and measurement complexity worsen
Solution Approach 1:
The patent introduces transmission indicators as intermediary signals that mediate between different radio access technologies. These indicators serve as standardized markers that both Wi-Fi and LTE devices can detect and interpret, facilitating coordinated access decisions. The indicators act as intermediaries that translate between different RAT protocols, reducing interference while maintaining detection precision through standardized signal formats
Solution Approach 2:
The patent modifies detection parameters and thresholds based on the type of transmission indicator detected. When a Wi-Fi preamble is detected, Wi-Fi-specific detection parameters are applied; when an LTE channel usage beacon is detected, LTE-specific parameters are used. This dynamic parameter adjustment optimizes detection accuracy for each RAT type while reducing false interference detection
Data Source
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AI summary
A device may detect a communication in an unlicensed radio frequency spectrum band. The communication may include a first transmission indicator associated with a first radio access technology. The device may use a second radio access technology to communicate via the unlicensed radio frequency spectrum band. The device may determine, based on the first transmission indicator, a source device type of a source device that transmitted the communication in the unlicensed radio frequency spectrum band. The device may selectively contend for access to the unlicensed radio frequency spectrum band or selectively transmit via the unlicensed radio frequency spectrum band based on the source device type.