EHT Preambles and Tone Plans for Wireless Resource Allocation
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Solution Overview
Problem
Wireless local area networks (WLANs) face challenges in efficiently managing resources to provide high bandwidth and response times due to multiple devices sharing resources, with some devices limited by communication protocols or hardware bandwidth, and the need to operate with both new and legacy protocols.
Innovation Solution
The proposed solution involves a radio architecture that includes front-end module, radio IC, and baseband processing circuitry, enabling coexistence of WLAN and Bluetooth functionalities, with advanced tone plans and preambles for extremely high throughput (EHT) to optimize resource utilization and communication protocols, such as IEEE 802.11ax standards, allowing for efficient scheduling and transmission techniques like OFDMA and MU-MIMO.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple devices share the same wireless resources, then network coverage and device connectivity are improved, but resource efficiency and bandwidth availability deteriorate
Solution Approach 1:
The patent segments the frequency spectrum into multiple resource units (RUs) of different sizes (26, 52, 106, 242, 484 tones) that can be dynamically allocated to different devices. This segmentation allows the system to efficiently divide available bandwidth among multiple devices, improving both connectivity and resource efficiency simultaneously
Solution Approach 2:
The patent implements dynamic resource allocation where the access point can adjust RU sizes and assignments in real-time based on channel conditions, device capabilities, and traffic demands. This dynamic approach optimizes resource efficiency while maintaining connectivity for all devices
2Adaptability or versatility
If legacy protocol compatibility is maintained, then device interoperability is improved, but throughput and performance capabilities deteriorate
Solution Approach 1:
The patent creates a universal preamble structure that serves multiple functions: it enables legacy devices to detect and defer from ongoing transmissions while simultaneously carrying new information fields for EHT devices to extract resource allocation, modulation, and coding parameters. This multi-functionality resolves the contradiction between compatibility and performance
Solution Approach 2:
The patent introduces an intermediary signaling mechanism where the legacy-compatible preamble acts as a mediator that bridges old and new protocols. The preamble contains both traditional fields for legacy devices and extended fields for EHT devices, allowing seamless coexistence without sacrificing throughput
3Productivity
If resource units are allocated to multiple devices, then network utilization is improved, but scheduling complexity and coordination overhead increase
Solution Approach 1:
The patent segments the frequency spectrum into standardized resource units with defined sizes (26, 52, 106, 242, 484 tones). This segmentation simplifies scheduling complexity by providing a structured framework for resource allocation, making it easier to manage multiple devices while maintaining high network utilization
Solution Approach 2:
The patent enables flexible parameter adjustment where resource unit sizes and allocations can be dynamically changed based on traffic conditions. This parameter flexibility allows the system to optimize network utilization while keeping scheduling manageable through standardized parameter sets
Data Source
AI summary
Methods, apparatuses, and computer readable media for tone plans and preambles for extremely high throughput (EHT) in a wireless network are disclosed. An apparatus of an EHT access point (AP) or EHT station (STA), where the apparatus includes processing circuitry configured to: encode a physical layer (PHY) protocol data unit (PPDU), the PPDU including a EHT preamble, the EHT preamble including a legacy preamble portion and a EHT preamble portion, the legacy preamble including a legacy short training field (L-SFT), a legacy long-training field (L-LTF), and a legacy signal field (L-SIG), the EHT preamble portion comprising an EHT short signal field (EHT S-SIG), the EHT S-SIG including a modulation and coding scheme (MCS) subfield indicating a MCS of a subsequent data portion. The PPDU may be transmitted on a distributed or contiguous resource unit (RU) allocation. The RU may be configured to not straddle two physical 20 MHz subchannels.