Distributed Resource Unit Sharing for OBSS Spectrum Efficiency
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Solution Overview
Problem
Existing wireless communication networks face inefficiencies in resource allocation and interference management, particularly in overlapping basic service sets, leading to suboptimal utilization of frequency channels and increased latency for low-latency traffic.
Innovation Solution
Implementing distributed resource units (DRUs) that allocate non-contiguous sets of tones over the entire bandwidth, allowing devices to operate within stringent power spectral density requirements and enhance spectrum efficiency, particularly in ultra-high reliability (UHR) transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If distributed resource units allocate non-contiguous sets of tones over the entire bandwidth, then spectrum efficiency is improved and power spectral density requirements are met, but device complexity increases due to additional resource allocation and management mechanisms
Solution Approach 1:
The frequency bandwidth is segmented into multiple distributed resource units, each containing non-contiguous sets of tones. This segmentation allows the system to allocate spectrum in a flexible, fine-grained manner that meets power spectral density requirements while improving overall spectrum efficiency through better utilization of available frequency resources.
Solution Approach 2:
The patent introduces a distributed resource unit structure that operates in an additional dimension of frequency allocation. Instead of traditional contiguous block allocation, the system maps resource units across the entire bandwidth in a distributed manner, enabling simultaneous multi-user transmissions and improving spectrum efficiency through multi-dimensional resource management.
2Loss of time
If distributed resource units enable higher power level transmissions, then latency is reduced for low-latency traffic, but interference management becomes more challenging in overlapping basic service sets
Solution Approach 1:
The distributed resource unit structure enables different parts of the frequency spectrum to have different quality characteristics. By allocating non-contiguous tones distributed across the bandwidth, the system can provide high-power transmissions in specific frequency regions while maintaining lower power in others, thereby reducing interference in overlapping basic service sets while still enabling low-latency traffic transmission.
Solution Approach 2:
The system performs preliminary resource allocation and interference assessment before enabling high-power transmissions. The distributed resource unit framework allows the network to pre-allocate frequency resources and assess potential interference patterns, enabling low-latency traffic to be transmitted at higher power levels only when interference conditions are acceptable, thus reducing latency while managing interference proactively.
3Productivity
If non-contiguous tone sets are allocated across the entire bandwidth, then frequency channel utilization is optimized, but measurement and detection complexity increases
Solution Approach 1:
The distributed resource unit allocation system incorporates feedback mechanisms that enable the network to monitor and detect the actual utilization of frequency resources. By receiving feedback about channel conditions and transmission success, the system can dynamically adjust resource allocation decisions, making the complex non-contiguous tone assignment process manageable through continuous monitoring and adaptive reconfiguration.
Data Source
AI summary
A first station (STA) receives from an overlapping basic service set (OBSS) access point (AP), a trigger frame alocating a first distributed resource unit, within a frequency channel bandwidth. The first STA transmits a data portion of a first physical layer protocol data unit (PPDU) via a second distributed resource unit, within the frequency channel bandwidth, that is not allocated by the trigger frame.