Wi-Fi DRS Window Overlap to Discourage 3GPP Unlicensed Channel Use
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Solution Overview
Problem
Wi-Fi systems face challenges in sharing unlicensed communication channels with 3GPP technologies like LAA, eLAA, feLAA, and NR-U, as these technologies may not share channels fairly, potentially limiting Wi-Fi performance and access.
Innovation Solution
Implementing techniques that allow Wi-Fi systems to determine and overlap Discovery Reference Signal (DRS) transmission windows of 3GPP technologies, thereby discouraging their use of unlicensed channels by starting Wi-Fi transmissions before or during the DRS window, ensuring fair access and higher performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If Wi-Fi systems share unlicensed channels with 3GPP technologies (LAA, eLAA, feLAA, NR-U), then channel utilization increases, but Wi-Fi performance and access fairness deteriorate
Solution Approach 1:
The Wi-Fi system performs preliminary actions by transmitting during the DRS transmission window before the 3GPP system can complete its discovery signal transmission. This preemptive transmission disrupts the 3GPP system's ability to advertise its presence and establish reliable communication, thereby preventing the fairness issue before it occurs
Solution Approach 2:
The Wi-Fi system identifies the DRS transmission window in advance and prepares to transmit during this specific time period. By having the transmission ready and executing it during the predetermined window, the Wi-Fi system ensures it can occupy the channel before the 3GPP system completes its discovery process
2Reliability
If Wi-Fi systems transmit during DRS transmission windows, then 3GPP technology access is discouraged, but channel availability determination becomes more complex
Solution Approach 1:
The Wi-Fi system performs channel availability determination (clear channel assessment) in advance, before the DRS transmission window begins. By completing the channel availability check beforehand and then transmitting during the window, the system simplifies the overall process while ensuring fair access
Solution Approach 2:
The transmission process is segmented into distinct phases: channel availability determination phase (before DRS window), transmission phase (during DRS window), and identification phase (detecting DRS windows). This segmentation makes the complex process more manageable and implementable
3Reliability
If Wi-Fi systems avoid channels used by 3GPP technologies, then access fairness improves, but available channels for Wi-Fi decrease
Solution Approach 1:
Instead of avoiding channels where 3GPP systems operate (the conventional approach), the Wi-Fi system inverts the strategy by actively transmitting during the 3GPP system's DRS transmission windows. This inversion disrupts the 3GPP system's ability to use the channel while allowing Wi-Fi to maintain access to all available channels
Data Source
AI summary
Techniques are described to provide to discourage use of an unlicensed spectrum channel by Third Generation Partnership Project (3GPP) technologies. In one example, a method includes performing a plurality of wireless transmissions for an unlicensed channel, wherein performing the plurality of wireless transmissions comprises: determining whether a next wireless transmission is proximate to a Discovery Reference Signal (DRS) transmission window; based on determining that the next wireless transmission is proximate to the DRS transmission window, determining whether the unlicensed channel is available; and based on determining that the unlicensed channel is available, starting the next wireless transmission before the DRS transmission window, wherein the next wireless transmission overlaps the DRS transmission window.