Push-Forward Channel Reservation for U-LTE Wi-Fi Coexistence
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Solution Overview
Problem
In wireless communication systems, especially those using unlicensed Long Term Evolution (U-LTE) and Wi-Fi, there is a challenge in ensuring fair coexistence and compliance with regional regulations like Listen Before Talk (LBT) when multiple devices compete for shared channel resources, as existing channel reservation mechanisms may not adequately account for differences in device capabilities and regulatory requirements.
Innovation Solution
A push-forward channel reservation mechanism is introduced, where U-LTE devices start observing and reserving channels a predetermined push-forward duration before the intended communication time, becoming more aggressive with each reservation failure, and performing repetitive reservations until successful, to ensure fair competition with Wi-Fi devices and comply with LBT regulations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If channel reservation is performed at the intended communication time, then device simplicity is maintained, but channel access conflicts occur and coexistence fairness deteriorates
Solution Approach 1:
The patent applies preliminary action by performing channel reservation before the intended communication time. Specifically, the channel reservation procedure is started at a second time that is before the first time (intended communication time) by a calculated push-forward duration. This advance reservation allows the device to secure channel access before conflicts can occur, improving reliability while maintaining operational simplicity through automated timing calculation.
2Reliability
If aggressive channel reservation is performed earlier, then coexistence fairness with Wi-Fi improves, but channel observation time increases
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the channel reservation timing based on the push-forward duration parameter. This parameter is calculated to optimize the balance between aggressive reservation (for fairness) and observation time. By changing this timing parameter, the system achieves fair coexistence with Wi-Fi devices while minimizing unnecessary observation time.
3Reliability
If repetitive channel reservation is performed, then channel access reliability improves, but device complexity increases
Solution Approach 1:
The patent applies self-service by implementing an automated repetitive reservation mechanism that performs multiple channel reservation attempts without requiring complex external control. The system automatically repeats the reservation procedure until successful channel access is achieved, with each attempt using the calculated push-forward duration. This self-service approach improves access reliability while keeping device complexity manageable through algorithmic automation rather than complex control logic.
Data Source
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AI summary
A shared-channel device is configured to perform a method for reserving a shared channel in a wireless communication system. The method includes, upon a determination to utilize a shared channel for payload data communication starting at a first time, calculating a push-forward duration. The method also includes performing a channel reservation procedure to reserve the shared channel, wherein the channel reservation procedure is started at a second time that is before the first time by the push-forward duration.