WLAN Frame Segmentation for Simultaneous Uplink Signaling
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Solution Overview
Problem
Current WLAN systems, particularly those using the 802.11ac standard, face inefficiencies in data communication when multiple users are concentrated, as they only allow one user device to send uplink signals at a time, leading to slow data transfer rates in crowded areas.
Innovation Solution
The proposed solution involves generating distinct information fields for legacy and non-legacy devices within a frame structure, allowing for the transmission of valid information to legacy devices while marking information for non-legacy devices as invalid, enabling simultaneous uplink communication and backward compatibility across different standards like 802.11ax and future 802.11be standards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the WLAN system uses 802.11ac standard with MU-MIMO, then downlink multi-user communication is supported, but uplink communication is limited to one user device at a time resulting in slow data transfer in crowded areas
Solution Approach 1:
The frame structure is segmented into multiple information fields (first information field for legacy devices, second information field for non-legacy devices) allowing different communication capabilities to coexist within the same transmission medium, enabling both 802.11ac and 802.11ax devices to operate simultaneously without interference
2Productivity
If the WLAN system implements 802.11ax OFDMA for simultaneous uplink communication, then data transfer speed improves in crowded areas, but backward compatibility with legacy devices is compromised
Solution Approach 1:
The frame structure is designed with universal compatibility by including multiple information fields that serve different device types. The first information field maintains compatibility with legacy 802.11ac devices while the second information field enables advanced 802.11ax OFDMA functionality, making the system universally applicable to both device generations
Solution Approach 2:
Different portions of the frame (information fields) are optimized for different device types. The first information field uses legacy-compatible formatting for 802.11ac devices, while the second information field uses extended formatting for 802.11ax devices, allowing each device type to interpret the appropriate portion according to its capabilities
3Loss of information
If the frame includes extended information fields for non-legacy devices, then signaling capacity increases, but legacy devices may misinterpret the extended fields as valid information
Solution Approach 1:
The extended information for non-legacy devices is extracted into a separate second information field within the frame structure. This extraction allows legacy devices to ignore the second field without affecting their ability to correctly interpret the first information field, while non-legacy devices can access both fields for enhanced signaling capacity
Data Source
AI summary
A method of communicating between a first device (e.g., an AP) and each of with a legacy device and a non-legacy device (e.g., STAs) includes, at the first device, generating a first information field for the legacy device, generating a second information field for the non-legacy device, generating a frame including the first information field and the second information field, and transmitting the frame, wherein the first information field includes a first value by which the legacy device identifies the first information field as valid, wherein the second information field includes a second value by which the legacy device identifies the second information field as invalid.