A-PPDU Channel Segmentation for Legacy-Compatible 60 GHz WiGig
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Solution Overview
Problem
Next Generation 60 GHz (NG60) WiGig devices require improved transmission efficiency while maintaining compatibility with legacy devices, necessitating a format and method for aggregate physical layer convergence protocol data units (A-PPDUs) that support both legacy and variable channel bandwidths to achieve data transmission speeds up to several tens of Gbps.
Innovation Solution
A transmission device and method that generates A-PPDUs by adding a guard interval to each part of the PPDU transmitted over different channel bandwidths, incorporating legacy and non-legacy headers and data fields, and transmitting them using single carrier or OFDM modulation, with non-legacy headers repeated for improved efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If NG60 WiGig devices use variable channel bandwidth to achieve higher transmission speeds, then data transmission speed is improved, but compatibility with legacy WiGig devices deteriorates
Solution Approach 1:
The PPDU is divided into two distinct parts: a first part containing legacy STF, legacy CEF, legacy header field, and non-legacy header field transmitted over channels 1 through L at predetermined bandwidth, and a second part containing non-legacy STF, non-legacy CEF, and data fields transmitted over channels L+1 through P at variable bandwidth. This segmentation allows legacy devices to process the first part while non-legacy devices can access the full variable bandwidth capability.
Solution Approach 2:
The transmission device is designed to support both legacy and non-legacy formats within the same system. The first part of the PPDU serves universal compatibility purposes by including legacy fields that all devices can interpret, while the second part provides enhanced functionality for non-legacy devices. This multi-functionality enables the system to serve both legacy and next-generation requirements simultaneously.
2Productivity
If A-PPDU format is optimized for variable channel bandwidth to improve transmission efficiency, then transmission efficiency is improved, but device complexity increases
Solution Approach 1:
Different parts of the PPDU are assigned different qualities and functions appropriate to their specific requirements. The first part uses legacy formats with predetermined bandwidth for compatibility, while the second part uses non-legacy formats with variable bandwidth for efficiency. Each section is optimized for its specific purpose rather than applying a uniform format throughout, reducing overall system complexity while maintaining high transmission efficiency.
Data Source
AI summary
In a transmission device, a signal processing circuit generates an aggregate physical layer convergence protocol data unit (A-PPDU) by adding a guard interval to each of a first part of a first physical layer convergence protocol data unit (PPDU) transmitted over each of a first through L'th channel of a predetermined channel bandwidth, where L is an integer of 2 or greater, a second part of the first PPDU transmitted over each of an (L+1)'th through P'th channel, which is a variable channel bandwidth that is N times the predetermined channel bandwidth, where N is an integer of 2 or greater and P is an integer of L+1 or greater, and a second PPDU transmitted over the (L+1)'th through P'th channel. A wireless circuit transmits the A-PPDU.