A-PPDU Channel Segmentation for Legacy-Compatible WiGig Throughput
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Solution Overview
Problem
Next Generation 60 GHz (NG60) WiGig devices require improved transmission efficiency to support both Legacy Format (LF) and Mixed Format (MF) Physical Layer Convergence Protocol Data Units (PPDUs, especially to achieve data transmission speeds comparable to newer wired digital interfaces, while maintaining compatibility with legacy devices.
Innovation Solution
A transmission device and method that generates an aggregate physical layer convergence protocol data unit (A-PPDU) by adding a guard interval to each PPDU transmitted over a predetermined channel bandwidth, with a second part transmitted over a variable channel bandwidth, incorporating legacy and non-legacy headers and data fields, and repeating non-legacy headers for single carrier transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If NG60 WiGig devices use variable channel bandwidth for MF PPDUs to achieve higher data transmission speeds, then transmission efficiency is improved, but compatibility with legacy WiGig devices is compromised
Solution Approach 1:
The A-PPDU is segmented into multiple PPDUs transmitted over different channel bandwidths. The first PPDU uses standard channel bandwidth (2.16 GHz) for legacy compatibility, while subsequent PPDUs use variable channel bandwidth (4.32 GHz or higher) for enhanced speed. This segmentation allows the system to simultaneously support both legacy and next-generation devices.
Solution Approach 2:
The transmission device is designed to perform multiple functions: it can transmit both LF PPDUs (legacy format) and MF PPDUs (mixed format) within the same A-PPDU structure. The system universally supports both standard and variable channel bandwidths, making it compatible with diverse device types while enabling advanced transmission capabilities.
2Productivity
If A-PPDU structure is optimized for variable channel bandwidth to improve transmission efficiency, then data throughput increases, but device complexity increases
Solution Approach 1:
Different portions of the A-PPDU structure are assigned different qualities characteristics. The first PPDU maintains legacy format with standard bandwidth for simplicity and compatibility, while the second and subsequent PPDUs adopt enhanced format with variable bandwidth for optimized performance. Each segment is tailored to its specific function, reducing overall system complexity.
Solution Approach 2:
The A-PPDU structure is designed to be dynamic, allowing the channel bandwidth to vary across different PPDUs within the aggregate. The system can adaptively select standard or variable bandwidth for each PPDU based on device capabilities and transmission requirements, enabling flexible optimization without rigid complex structures.
3Reliability
If non-legacy headers are repeated N times for single carrier transmission, then transmission reliability is improved, but loss of time increases
Solution Approach 1:
The non-legacy header is copied and transmitted N times within the A-PPDU structure for single carrier transmission. This redundancy ensures that the header information is received correctly even if some copies are corrupted, improving reliability. The copying is done efficiently to minimize the time penalty.
Solution Approach 2:
Instead of transmitting the complete header information once with full redundancy, the system uses partial repetition of the non-legacy header N times. This excessive action (repeating more than once) provides sufficient reliability margin while avoiding the time cost of transmitting the entire header multiple times with full redundancy.
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.