OBSS Pathloss-Based Transmit Opportunity Scheduling
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Solution Overview
Problem
Wireless communication networks face interference issues due to overlapping basic service sets (OBSS), leading to reduced transmit opportunities (TXOPs) and increased latency, as existing methods rely on power threshold comparisons that may not accurately account for pathloss variations between devices.
Innovation Solution
Implementing a method where devices detect energy levels and pathloss of OBSS communications, adjusting transmit power levels and scheduling TXOPs based on these measurements to minimize interference and maximize spatial reuse, using a lookup table (LUT) to store and convey power information between access points (APs) and stations (STAs).
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If power threshold comparison methods are used to manage OBSS, then network coordination is simplified, but transmit opportunities are reduced and latency increases due to inaccurate pathloss accounting
Solution Approach 1:
The patent changes the parameter from simple power threshold comparison to pathloss-based transmit opportunity determination. By calculating actual pathloss values between devices and comparing against threshold pathloss values, the system accurately accounts for signal degradation over distance, enabling more devices to transmit simultaneously without causing harmful interference, thus reducing latency while maintaining manageable coordination complexity through standardized pathloss measurements and comparisons
2Reliability
If higher transmit power is used to overcome pathloss, then communication reliability improves, but interference with other OBSS increases and throughput decreases
Solution Approach 1:
The patent applies local quality by allowing each transmitting device to use a transmit power level tailored to its specific pathloss conditions rather than a uniform power level across the network. Devices calculate their individual pathloss to the receiver and adjust transmit power accordingly, enabling reliable communication for each link while minimizing overall network interference and maximizing total throughput through optimized local power settings
3Measurement precision
If strict interference avoidance protocols are implemented, then signal quality is maintained, but the number of simultaneous transmit opportunities decreases
Solution Approach 1:
The patent changes the interference management parameter from binary clear channel assessment to continuous pathloss-based decision making. By calculating actual pathloss values and comparing against threshold pathloss values, the system determines whether simultaneous transmissions will maintain acceptable signal quality at receivers. This enables multiple transmit opportunities to proceed concurrently when pathloss conditions indicate acceptable interference levels, increasing productivity while maintaining signal quality through precise pathloss measurements and comparisons
Data Source
AI summary
A device can detect an energy level of an OBSS communication. The device can determine an identity associated with the OBSS communication. The device can determine a threshold associated with the identity of the OBSS communication. The device can compare the energy level of the OBSS communication to the threshold. The device can transmit a message simultaneous to the OBSS communication on a same link as the OBSS communication. The message can be transmitted based on the comparison of the threshold to the energy level of the OBSS communication.