Virtual Resource Unit Aggregation for Multi-RU WLAN Assignment
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Solution Overview
Problem
Existing wireless communication systems cannot assign multiple resource units to a single wireless station, limiting spectral efficiency and network throughput, especially when preamble puncturing is used, and failing to achieve frequency diversity for improved link quality.
Innovation Solution
The implementation of a virtual resource unit (vRU) that aggregates multiple resource units, allowing for joint encoding and parameter calculation based on existing standards, enabling the assignment of multiple RUs to a single wireless station, and supporting unequal MCS and spatial streams for enhanced transmission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple resource units are assigned to a single wireless station, then spectral efficiency and network throughput are enhanced, but device complexity and processing requirements increase
Solution Approach 1:
The patent combines multiple resource units into a single aggregated resource unit assignment. The access point aggregates multiple RUs and assigns them as one unit to a wireless station, simplifying the assignment process while enabling the station to receive multiple RUs. This merging approach enhances throughput without proportionally increasing processing complexity at the assignment stage.
Solution Approach 2:
The patent creates a universal resource unit aggregation mechanism that can handle various combinations of RUs (different sizes, adjacent or non-adjacent) through a unified assignment framework. This multi-functional approach allows the same basic mechanism to serve multiple assignment scenarios, reducing the need for separate processing logic for each case.
2Reliability
If preamble puncturing is used to avoid interference, then link quality is improved, but spectral efficiency decreases due to unavailable frequencies
Solution Approach 1:
The patent segments the available spectrum into multiple resource units, allowing selective assignment of only the puncture-free segments to wireless stations. When preamble puncturing creates unavailable frequencies, the system divides the remaining available frequencies into separate RUs and assigns them to stations, effectively utilizing all non-punctured spectrum while avoiding interference.
Solution Approach 2:
The patent transitions from treating the channel as a single continuous bandwidth to a multi-dimensional structure of discrete resource units. This allows the system to navigate around punctured frequencies by selecting and assigning specific RU combinations that avoid interference, effectively adding a dimensional perspective to spectrum utilization.
3Quantity of substance
If narrower channel bandwidths are assigned per user, then more users can be supported, but throughput per user is reduced
Solution Approach 1:
The patent implements dynamic resource unit aggregation where the size and composition of RUs assigned to each user can vary based on channel conditions, user requirements, and available spectrum. The system can dynamically adjust whether to assign single RUs or aggregated multiple RUs to different users, allowing flexible optimization of both user capacity and individual throughput.
Solution Approach 2:
The patent changes the parameter of resource allocation from fixed narrow bandwidth assignments to variable aggregated bandwidth assignments. By modifying the aggregation level of RUs assigned to each user, the system can adapt to different scenarios - assigning smaller aggregated RUs to support more users or larger aggregated RUs to boost individual throughput when spectrum is available.
Data Source
AI summary
Embodiments of the present invention can assign multiple resource units (RUs) to a single wireless station using an aggregated Multi-RU (“virtual resource unit” or “vRU”) that aggregates multiple RUs, and the parameters of the virtual RU can be calculated according to existing standards such the padding schemes and RUs (e.g., RU26, RU52, RU106, RU242, RU484, RU996, RU2x996) defined in IEEE 802.11ax. The virtual RU parameters used for joint encoding can be directly calculated based on formulas described herein according to embodiments of the present invention, and according to values obtained from pre-defined tables.