PHY Layer Reuse for 60 GHz Wi-Fi With Tight CFO Accuracy
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Solution Overview
Problem
The transition to the 60 GHz band in Wi-Fi communications requires new hardware due to significant bandwidth and waveform differences from traditional bands, leading to higher costs and potential traffic congestion, while existing CFO accuracy requirements are inadequate for reliable communication.
Innovation Solution
Implementing a modified clock accuracy requirement of 1 PPM for both traditional and 60 GHz bands, and upclocking preamble and data portions by a factor to accommodate 60 GHz operations using legacy hardware, thereby reducing hardware modifications and enhancing communication reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If new hardware is implemented for 60 GHz band communications, then communication reliability is improved, but device cost and complexity increase
Solution Approach 1:
The patent enables legacy Wi-Fi hardware to operate in both traditional bands (2.4 GHz, 5 GHz) and the 60 GHz band by implementing a unified PHY layer that adapts to different frequency bands. The baseband processor and RF front end are designed to handle multiple bands without requiring completely separate hardware architectures, allowing one hardware platform to serve multiple communication standards and frequency ranges.
Solution Approach 2:
The patent modifies key PHY layer parameters including implementing a modified clock accuracy requirement of 1 PPM (compared to traditional 20 PPM), adjusting subcarrier spacing, and modifying preamble structures to accommodate 60 GHz operations. These parameter changes enable legacy hardware to achieve reliable communication in the 60 GHz band without requiring complete hardware redesign, thereby improving reliability while controlling complexity.
2Device complexity
If legacy hardware is used for 60 GHz band, then device cost is reduced, but communication reliability deteriorates due to inadequate CFO accuracy
Solution Approach 1:
The patent introduces a modified clock accuracy requirement of 1 PPM for 60 GHz operations, which is stricter than the traditional 20 PPM requirement. This parameter change compensates for the larger carrier frequency offset (CFO) inherent in 60 GHz communications, enabling legacy hardware to achieve adequate synchronization accuracy and communication reliability without requiring completely new hardware designs.
Solution Approach 2:
The patent implements modified preamble structures that serve as intermediary elements to facilitate reliable communication between legacy hardware and the 60 GHz band. The preamble includes specific training sequences and synchronization signals that help the receiver acquire and track the carrier frequency offset, acting as a bridge that enables reliable communication despite the hardware limitations.
3Adaptability or versatility
If traditional bands are used, then hardware compatibility is maintained, but network traffic congestion increases
Solution Approach 1:
The patent enables wireless devices and access points to operate simultaneously in traditional bands (2.4 GHz, 5 GHz) and the 60 GHz band using the same hardware platform. This multi-band capability allows the network to distribute traffic across multiple frequency resources, reducing congestion in traditional bands by offloading traffic to the available 60 GHz capacity while maintaining hardware compatibility.
Solution Approach 2:
The patent implements dynamic band selection and traffic distribution mechanisms that allow the system to adaptively route traffic based on current network conditions, channel availability, and quality of service requirements. This dynamic approach enables the network to utilize the 60 GHz band when additional capacity is needed while falling back to traditional bands when appropriate, optimizing overall network throughput and reducing congestion.
Data Source
AI summary
This disclosure provides methods, devices and systems for communicating over a 60 GHz band and reusing legacy hardware for communication over sub-6 bands. Certain aspects are directed to outputting, for transmission to a second wireless device, a first packet, wherein the first packet is output via a radio frequency (RF) front end defined by a first clock accuracy requirement having an acceptable error rate that is lower than a legacy clock accuracy requirement, and wherein the first packet is output for transmission via a first band. Certain aspects are directed to obtaining, from the second wireless device, a second packet via the first band.