WLAN Tone Plan RU Allocation for Spectrum Efficiency
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Solution Overview
Problem
Next-generation wireless local area networks (WLANs) face challenges in improving spectrum efficiency and area throughput, especially in dense environments with multiple access points and stations, and require enhanced performance in both indoor and outdoor settings, including interference mitigation and high user load scenarios.
Innovation Solution
A method and device for transmitting and receiving data based on a tone plan in a WLAN system, utilizing resource units (RUs) with specific tone configurations for broadband communication, including guard tones and DC tones, to enable efficient subcarrier allocation and high-throughput transmissions, supporting both single-user and multi-user MIMO and OFDMA scenarios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a tone plan is optimized for high throughput transmissions, then spectrum efficiency improves, but system complexity increases due to multiple RU configurations and tone allocations
Solution Approach 1:
The broadband spectrum is segmented into multiple Resource Units (RUs) with different tone configurations (e.g., 26-tone, 52-tone, 106-tone, 242-tone, 484-tone, 996-tone RUs). Each RU can be independently allocated to different STAs, allowing flexible spectrum utilization while maintaining manageable configuration complexity through standardized RU types.
Solution Approach 2:
The tone plan configuration is made dynamic by allowing the AP to select and allocate different RU sizes and configurations based on current channel conditions, user requirements, and interference levels. This enables the system to adaptively optimize spectrum efficiency without requiring exhaustive preconfiguration of all possible scenarios.
2Reliability
If guard tones and DC tones are allocated in the tone plan, then interference mitigation improves, but available bandwidth for data transmission decreases
Solution Approach 1:
Guard tones and DC tones are allocated at specific critical locations (edges of RUs and center frequency) where interference protection is most needed, rather than uniformly across the entire bandwidth. This localized protection approach ensures reliable interference mitigation while minimizing the impact on overall data transmission capacity.
Solution Approach 2:
The number and positioning of guard tones and DC tones are adjusted as configurable parameters in the tone plan. Different RU configurations have different numbers of guard tones (e.g., 2 or 3 per side), allowing the system to optimize the balance between interference protection and data throughput based on channel conditions and regulatory requirements.
3Adaptability or versatility
If multiple RU configurations are supported for different STAs, then system adaptability improves, but control information overhead increases
Solution Approach 1:
A universal tone plan structure is defined that can accommodate multiple RU configurations (26-tone, 52-tone, 106-tone, 242-tone, 484-tone, 996-tone) within the same broadband framework. This universal structure allows the system to support diverse user requirements and channel conditions while using a single standardized control information format, reducing overhead compared to having separate configurations for each RU type.
Data Source
AI summary
Proposed are a method and an apparatus for transmitting and receiving data to and from a wireless LAN system. Specifically, an AP transmits control information to an STA. The AP transmits data to or receives data from the STA on the basis of the control information. The control information includes RU information for transmitting and receiving data over a broadband network. If the broadband, on the basis of the RU information, is defined as only one full bandwidth, the RU information includes allocation information that the broadband consists of 12 guard tones, 3044-tone RU, 5 DC tones, and 11 guard tones. If the broadband, on the basis of the RU information, includes three 996-tone RUs, the RU information includes allocation information that the broadband consists of 12 guard tones, a first 996-tone RU, 1 null tone, 26-tone RU, 1 null tone, a second 996-tone RU, 1 null tone, 26-tone RU, 1 null tone, a third 996-tone RU, and 11 guard tones.