WLAN Resource Unit Allocation for Frequency Diversity
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Solution Overview
Problem
The existing WLAN systems face challenges in improving throughput and robustness, especially in outdoor environments with high user loads and interference, and require efficient multi-user transmission schemes to optimize spectrum efficiency and area throughput.
Innovation Solution
A method and device for transmitting data in a WLAN system that generates a Physical Protocol Data Unit (PPDU) with resource units allocated discontinuously in the frequency domain, allowing the same logical index resource units to be allocated to the same station, enhancing frequency diversity and robustness in frequency-selective channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If resource units are allocated continuously in frequency domain to simplify allocation, then allocation complexity is reduced, but frequency diversity and robustness in frequency-selective channels deteriorate
Solution Approach 1:
The frequency domain is segmented into multiple resource units (RUs) that are discontinuously allocated to the same STA. This segmentation allows the system to distribute resource units across different frequency subcarriers, thereby achieving frequency diversity without requiring continuous allocation, which would be complex to manage while maintaining robustness against frequency-selective fading.
Solution Approach 2:
Different resource units are allocated with different local characteristics in the frequency domain. By assigning resource units with different logical indices to the same STA in a discontinuous manner, the system ensures that each resource unit experiences different channel conditions, thereby improving overall reliability through frequency diversity while maintaining manageable allocation complexity through structured indexing.
2Productivity
If more resource units are allocated to increase throughput, then data transmission rate is improved, but susceptibility to interference and frequency-selective fading increases
Solution Approach 1:
The system segments the frequency domain into multiple resource units and allocates them discontinuously to the same STA. This segmentation allows the system to increase the total number of allocated resource units for higher throughput while distributing them across different frequency regions, thereby reducing susceptibility to frequency-selective fading and interference through frequency diversity.
Solution Approach 2:
The patent introduces a new dimension in resource allocation by using discontinuous frequency domain distribution. Instead of allocating resource units in a continuous block, the system spreads them across the frequency spectrum, adding a dimensional aspect to allocation that simultaneously increases throughput capacity and improves robustness against interference and fading.
3Adaptability or versatility
If resource units are allocated to support more users, then multi-user capability is improved, but spectrum efficiency and area throughput deteriorate in dense environments
Solution Approach 1:
The discontinuous resource unit allocation mechanism serves multiple functions simultaneously: it supports multi-user transmission by allocating different resource units to different STAs, while also improving spectrum efficiency and area throughput in dense environments through frequency diversity. This universal allocation strategy enhances both adaptability to multiple users and productivity in terms of spectrum utilization.
Solution Approach 2:
The system changes the allocation parameter from continuous to discontinuous distribution in the frequency domain. This parameter change allows the system to maintain high spectrum efficiency and area throughput in dense environments while supporting multiple users, as the discontinuous allocation reduces interference and improves frequency diversity without sacrificing user capacity.
Data Source
AI summary
According to an embodiment of the present invention, a data transmission method for a station (STA) device in a wireless LAN (WLAN) system includes the steps of: generating a physical protocol data unit (PPDU) that includes a physical preamble and a data field; and transmitting the PPDU. Therein: the whole transmission band of the PPDU is made up of a plurality of resource units in a frequency region; each of the plurality of resource units is configured from a preset number of tones; resource units, from among the plurality of resource units, that have the same logical index are allocated to the same STA; and the resource units that have the same logical index may be discontinuously located in the frequency region.