Tone Plan Resource Unit Allocation for WLAN 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 outdoor settings, where existing technologies struggle to enhance performance and manage interference effectively.
Innovation Solution
A method and apparatus for transmitting and receiving data using a tone plan in a WLAN system, which allocates resource units based on a proposed tone plan, enabling high throughput and efficient subcarrier use through the use of resource units such as 4068-tone, 2020-tone, 996-tone, 484-tone, 242-tone, 106-tone, and 52-tone units, and supports both single-user and multi-user MIMO and OFDMA transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If existing WLAN technologies are used in dense environments, then device compatibility is maintained, but spectrum efficiency and area throughput fail to improve
Solution Approach 1:
The patent segments the frequency spectrum into multiple resource units (RUs) with different bandwidths (e.g., 26-tone, 52-tone, 106-tone, 242-tone RUs). This segmentation allows the system to allocate appropriate RU sizes based on channel conditions, user requirements, and interference levels, thereby improving spectrum efficiency in dense environments while maintaining compatibility with existing devices through standardized OFDMA frameworks.
Solution Approach 2:
The patent implements dynamic tone plan configuration where the access point can flexibly adjust RU allocations, bandwidth assignments, and subcarrier spacing based on real-time channel conditions, traffic demands, and interference patterns. This dynamic adaptation enables the system to optimize performance across varying environmental conditions including dense indoor deployments and outdoor scenarios.
2Productivity
If bandwidth is increased to improve throughput, then area throughput increases, but interference management becomes more difficult
Solution Approach 1:
The patent divides wide bandwidths into multiple smaller resource units that can be selectively allocated to different users and services. This segmentation allows the system to concentrate transmissions on specific frequency subsets, reducing overall interference while maintaining high area throughput. Guard tones and null subcarriers are strategically placed between RUs to provide additional isolation and mitigate inter-RU interference.
Solution Approach 2:
The patent applies different RU configurations and allocation strategies to different frequency regions based on local channel conditions. Certain frequency subsets may use wider RUs where channel conditions are favorable, while other regions use narrower RUs or increased guard tones where interference is problematic. This localized optimization allows the system to maximize throughput in favorable regions while maintaining robust interference management in challenging regions.
3Reliability
If resource allocation is optimized for single-user transmission, then link performance improves, but multi-user support and spectrum efficiency deteriorate
Solution Approach 1:
The patent segments the available bandwidth into multiple orthogonal resource units that can be simultaneously allocated to different users using OFDMA. Each user receives dedicated RUs tailored to their channel conditions and service requirements, maintaining reliable link performance while enabling efficient multi-user support. The segmented structure allows independent optimization of each user's allocation without compromising others' performance.
Solution Approach 2:
The patent designs a universal resource allocation framework that can simultaneously support single-user and multi-user transmissions, as well as various modulation and coding schemes. The same RU structure and allocation mechanisms work for both SU-MIMO and MU-MIMO scenarios, as well as for different service types (e.g., voice, data, video). This multi-functionality enables the system to achieve high spectrum efficiency in multi-user scenarios while preserving reliable link performance when needed.
Data Source
AI summary
A method and an apparatus for transmitting and receiving data in a wireless LAN system are proposed. Specifically, an AP transmits control information to at least one STA. The AP transmits data to at least one STA or receives data from at least one STA, on the basis of the control information. The control information includes resource unit information for transmitting and receiving the data in a broadband. If the RU information is tone plan information for the full bandwidth of the broadband, the RU information includes allocation information that the broadband is composed of 12 guard tones, 4068 tones RU, 5 DC tones, and 11 guard tones. If the RU information is tone plan information to which OFDMA is applied for the broadband, the RU information includes allocation information that the broadband is composed of 12 guard tones, 2020 tones RU, 13 tones RU, 7 DC, 13 tones RU, 2020 tones RU, and 11 guard tones.