Opportunistic Reference Signal Transmission in Unlicensed Spectrum
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Solution Overview
Problem
In broadband communications networks, especially in unlicensed frequency spectra, the periodic transmission of reference signals by user equipment (UE) is unreliable due to interference from various communication devices operating under different protocols, leading to unpredictable availability of the wireless medium.
Innovation Solution
Implementing opportunistic reference signal transmission techniques, where the UE determines a configuration window for transmitting and receiving reference signals based on the availability of the wireless medium, using discovery measurement timing configurations and opportunistic discovery signal occasions to ensure reliable signal delivery across different radio access technologies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If periodic reference signal transmission is implemented in unlicensed spectrum, then reference signal transmission reliability deteriorates due to interference from other communication devices operating under different protocols
Solution Approach 1:
The patent implements dynamic reference signal transmission by allowing the UE to transmit reference signals at flexible timing opportunities rather than strict periodic intervals. The transmission timing is adapted based on channel availability detection, enabling the system to dynamically respond to interference conditions from other RATs while maintaining reference signal transmission reliability.
Solution Approach 2:
The patent changes the transmission parameter from fixed periodic timing to opportunistic timing based on channel availability. By monitoring channel conditions and selecting transmission opportunities when the channel is clear, the system adjusts the timing parameter dynamically to avoid interference from other communication devices operating under different protocols.
2Reliability
If opportunistic reference signal transmission is implemented, then transmission predictability worsens due to flexible timing based on channel availability
Solution Approach 1:
The patent applies preliminary action by having the UE detect channel availability in advance before transmitting reference signals. The system performs channel sensing and identifies suitable transmission opportunities proactively, ensuring that reference signals are transmitted only when channel conditions are favorable, thereby maintaining reliability while managing timing uncertainties.
Solution Approach 2:
The patent implements feedback mechanisms where the UE monitors channel conditions and uses this information to determine optimal transmission timing. The system continuously feedbacks channel availability status and adjusts transmission timing accordingly, balancing reliability requirements with timing predictability through adaptive decision-making.
Data Source
AI summary
Various embodiments may be generally directed to techniques for transmitting and receiving one or more reference signals opportunistically within a window over an unlicensed carrier. Various embodiments provide techniques for determining a configuration of the window within an operating environment that may include one or more different radio access technologies (RATs). Various embodiments provide techniques for transmitting the one or more reference signals opportunistically within the window based on an availability of a wireless communications medium. Various embodiments provide techniques for receiving and recovering the one or more reference signals regardless of their location within the window, thereby improving communications in an unlicensed spectrum shared by a variety of different communication devices that may operate according to a variety of different communication protocols.