Memory Platform DVFS Coordination for Wi-Fi 7 Multi-Link RFI
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Solution Overview
Problem
The introduction of Multi-Link Operation (MLO) in Wi-Fi 7, which allows simultaneous data transmission and reception across different Wi-Fi bands, is hindered by memory devices such as SODIMMs and UDIMMs, which generate radio frequency interference (RFI) due to dynamic voltage frequency scaling (DVFS) points within the Wi-Fi bands, leading to reduced throughput and connection issues.
Innovation Solution
Implementing a processor-based software or firmware solution that dynamically adjusts DVFS points to avoid interference by moving them outside the Wi-Fi bands or prioritizing channel protection based on signal-to-noise ratio (SNR) to mitigate memory interference without physical design changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If Multi-Link Operation (MLO) is implemented to enable simultaneous data transmission across different Wi-Fi bands, then throughput and connectivity are improved, but memory devices generate radio frequency interference (RFI) due to dynamic voltage frequency scaling (DVFS) points within the Wi-Fi bands, causing connection issues and reduced performance
Solution Approach 1:
The patent implements dynamic adjustment of memory DVFS points based on active Wi-Fi channels. The system continuously monitors which Wi-Fi channels are in use and dynamically reconfigures memory operating frequencies to avoid overlapping with active Wi-Fi bands, enabling both MLO high throughput and interference avoidance through real-time adaptation
Solution Approach 2:
The patent changes the operating parameters of memory devices by adjusting DVFS points to specific frequency ranges that do not overlap with Wi-Fi bands. When Wi-Fi channels are detected, the system modifies memory frequency parameters to fall within safe ranges, thereby eliminating RFI while maintaining acceptable memory performance
2Speed
If memory devices operate at higher speeds to improve data transfer performance, then productivity increases, but the radiated digital noises from memory devices cause radio frequency interferences (RFI) that degrade Wi-Fi receiver performance
Solution Approach 1:
The system dynamically adjusts memory operating speeds based on Wi-Fi channel activity. When Wi-Fi channels are detected as active, the system reduces memory speeds to avoid generating RFI in those frequency ranges. When Wi-Fi channels are inactive, memory operates at maximum speeds for optimal performance, achieving both high speed and low interference at different times
3Object-affected harmful factors
If physical design changes are implemented to shield memory devices from Wi-Fi antennas, then interference is reduced, but system cost and complexity increase
Solution Approach 1:
The patent replaces physical shielding mechanisms with a software-based frequency coordination system. Instead of using metal shields, filters, or physical separation structures, the system uses firmware to monitor Wi-Fi channel usage and dynamically adjust memory DVFS points, achieving interference mitigation through intelligent control rather than physical barriers
Solution Approach 2:
The system implements self-service interference mitigation where the memory controller autonomously monitors Wi-Fi channel activity and adjusts its own operating frequencies without requiring external intervention or complex physical shielding infrastructure, reducing system complexity while maintaining effectiveness
Data Source
AI summary
A device for a computing platform includes a wireless communication device, configured to concurrently receive data from a first wireless link and a second wireless link; and a processor, configured to compute memory platform interference characteristics at the wireless communication device, the memory platform interference characteristics representing a memory noise level experienced in a first wireless frequency channel of the first wireless link and a memory noise level experienced in a second wireless frequency channel of the second wireless link; determine an interference mitigation strategy based on the memory platform interference characteristics, the first wireless frequency channel, the second wireless frequency channel, and one or more candidate memory speeds of the computing platform; and instruct the computing platform or a memory platform to avoid interference based on the interference mitigation strategy.