Multi-Radio WiFi 7 Link Scheduling Under STR Interference
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Solution Overview
Problem
The advent of multi-link devices (MLDs) in WiFi 7 introduces challenges with insufficient radio filtering, leading to interference between transmit and receive radios, and unaddressed load balancing issues, particularly with simultaneous transmit and receive (STR) and non-simultaneous transmit and receive (NSTR) constraints.
Innovation Solution
Implementing load balancing techniques and scheduling strategies for access points with multiple radios, including biasing access to middle data links, prioritizing certain client devices, and using link steering mechanisms to manage STR constraints, while optimizing radio configurations to minimize interference and enhance throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If radio filtering is reduced to allow simultaneous transmit and receive operations, then throughput is improved, but interference between transmit and receive radios increases
Solution Approach 1:
The patent segments the radio frequency spectrum into multiple channels and uses spatial segmentation through multiple antennas. By dividing the communication resources into separate spatial streams and frequency channels, the system can simultaneously transmit and receive on different segments without mutual interference, thus improving throughput while managing interference through resource division.
Solution Approach 2:
The patent introduces signal processing algorithms and protocol mechanisms as intermediaries to manage simultaneous transmit and receive operations. These intermediaries coordinate the radio operations, schedule transmissions, and process signals to enable STR functionality while mitigating interference through intelligent resource management and signal separation techniques.
2Productivity
If multiple radios are added to increase capacity, then productivity is improved, but device complexity increases
Solution Approach 1:
The patent combines multiple radios into a unified multi-link device architecture that shares common processing resources, memory, and control logic. By merging the functionality of multiple radios under a single coordinated system, the patent achieves increased data transmission capacity while reducing overall device complexity through resource sharing and centralized management.
Solution Approach 2:
The patent designs the multi-link device with universal components that can serve multiple functions. The same radio interfaces and processing units can operate in different modes (transmit, receive, simultaneous operations) across multiple links, reducing the need for dedicated hardware for each function and thereby decreasing device complexity while maintaining high productivity.
3Productivity
If load balancing is implemented across multiple links, then throughput is improved, but latency imbalance between links increases
Solution Approach 1:
The patent implements dynamic load balancing that continuously monitors and adjusts traffic distribution across links based on current conditions. By making the load balancing mechanism dynamic rather than static, the system can adapt to changing traffic patterns and link conditions, improving overall throughput while minimizing latency imbalance through real-time optimization of resource allocation.
Solution Approach 2:
The patent changes operational parameters such as modulation schemes, data rates, and resource allocation settings based on link conditions and traffic requirements. By adjusting these parameters dynamically, the system can balance load across links to maximize throughput while maintaining acceptable latency levels, resolving the contradiction between productivity and time loss.
Data Source
AI summary
An arrangement of three radios maybe provided. The three radios define first and second outer data links and a middle data link. Access to the arrangement of three radios can be biased to the middle data link in one direction upon a data transmission through the first and second outer data links being dominate in an opposite direction. Data transmission with enhanced multi-link single radio (eMLSR) client devices can be prioritized lower than data transmission with simultaneous transmit and receive radio (STR) client devices and non-simultaneous transmit and receive radio (NSTR) client devices. A radio can be configured for data transmission with a client device. The range of the radio is limited when the data traffic through the radio exceeds a determined number of bytes of data in a determined amount of time.