NR-U Reservation Signal Color Coding for Tight Frequency Reuse
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently sharing unlicensed spectrum among multiple network operating entities, with asynchronous sharing leading to lower spectral efficiency and network capacity, while coordinated priority-based sharing requires extensive coordination efforts.
Innovation Solution
Implementing tight frequency reuse color coding techniques, where each operator is assigned a unique waveform sequence for spectrum reservations, allowing energy detection-based LBT to determine spectrum access and enable synchronized communications among operators.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If asynchronous spectrum sharing is used among multiple network operating entities, then spectrum access flexibility is improved, but spectral efficiency deteriorates
Solution Approach 1:
The patent applies color coding to reservation signals where each network operating entity is assigned a unique color (waveform sequence). This allows receiving entities to quickly identify and filter reservations from different operators, enabling flexible asynchronous access while maintaining high spectral efficiency through efficient spectrum utilization and reduced collisions
2Productivity
If coordinated priority-based spectrum sharing is implemented, then spectral efficiency is improved, but coordination complexity increases
Solution Approach 1:
The patent enables each network operating entity to independently perform clear channel assessment and make transmission decisions based on detecting color-coded reservation signals from other entities. This self-service mechanism achieves coordinated spectrum sharing and high spectral efficiency without requiring complex centralized coordination infrastructure
Solution Approach 2:
By assigning unique color codes (waveform sequences) to each operator's reservation signals, the system enables automatic identification and filtering of reservations. This simplifies the coordination mechanism while maintaining high spectral efficiency through efficient spectrum utilization and collision avoidance
3Reliability
If traditional LBT procedures are used in unlicensed spectrum, then collision avoidance is improved, but network capacity deteriorates
Solution Approach 1:
The patent enhances traditional LBT by incorporating color-coded waveform sequences in reservation signals. This allows entities to identify and prioritize reservations from different operators, enabling more aggressive spectrum access strategies that increase network capacity while maintaining collision avoidance through the underlying LBT mechanism
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enhances spectral efficiency and network capacity by allowing better frequency reuse with reduced coordination complexity, enabling flexible spectrum sharing and lower interference.
Implementation Method 1
allowing energy detection-based LBT to determine spectrum access
Data Source
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AI summary
Wireless communications systems and methods related to communications in an unlicensed spectrum with tight frequency reuse color coding are provided. A first wireless communication device communicates, with a second wireless communication device, a first reservation signal to reserve a first transmission opportunity (TXOP) in a spectrum shared by a plurality of network operating entities. The first reservation signal includes a first waveform sequence identifying at least a first network operating entity of the plurality of network operating entities associated with the first wireless communication device and the second wireless communication device. The first wireless communication device communicates, with the second wireless communication device, a first communication signal in the spectrum during the TXOP.