MU BSS Load Metrics for WLAN Channel Utilization
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Solution Overview
Problem
Current WLAN systems lack mechanisms to effectively characterize and report Basis Service Set (BSS) load conditions specific to multi-user (MU) communications, leading to inefficient channel utilization, interference management, and load balancing, especially in dense environments.
Innovation Solution
An access point (AP) determines and communicates MU BSS load information, including the number of MU-capable user stations, active stations, PPDU time ratios, and underutilization levels of frequency bandwidth, to facilitate better resource allocation and load balancing among BSSs, which is included in beacon frames and distributed periodically to user stations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional BSS load information mechanisms are used in WLAN systems, then the system maintains simplicity in load reporting, but the channel utilization efficiency and interference management capability deteriorate due to lack of MU-specific load characterization
Solution Approach 1:
The BSS load information is segmented into multiple distinct metrics: total MU competitors count, active STA count, MU DL PPDU time ratio, MU UL PPDU time ratio, and underutilization levels. This segmentation allows each metric to be calculated and reported independently, providing granular visibility into MU communication load while maintaining manageable complexity through modular measurement approaches.
Solution Approach 2:
The patent introduces a new dimension of load characterization by adding MU-specific metrics to the traditional BSS load information framework. Instead of a single aggregate load value, the system now reports load across multiple dimensions (time ratios for DL/UL MU PPDUs, underutilization levels, competitor counts), enabling stations to make informed decisions about BSS selection based on MU communication opportunities.
2Ease of operation
If detailed MU BSS load information is reported to all user stations, then the load balancing and resource allocation improve, but the overhead and processing requirements increase
Solution Approach 1:
The MU BSS load information metrics are designed to serve multiple functions simultaneously: they enable load balancing decisions, facilitate spatial reuse opportunities, support interference management, and provide insights for BSS selection. By making this information universally available to all stations through beacon frames, the system achieves multiple objectives without requiring separate reporting mechanisms for each function.
3Adaptability or versatility
If the AP determines and reports comprehensive MU load metrics including underutilization levels and PPDU time ratios, then the spatial reuse and interference management are facilitated, but the computational complexity at the AP increases
Solution Approach 1:
The AP leverages existing measurement and monitoring infrastructure to gather the data needed for MU load metrics. Rather than implementing complex new measurement mechanisms, the system uses readily available information about ongoing MU transmissions, PPDU timings, and station activity to compute the load metrics. This self-service approach minimizes additional computational burden while providing comprehensive load characterization.
Data Source
AI summary
Systems and methods of providing Basis Service Set (BSS) load information pertinent to multi-user (MU) communications in WLAN systems. An access point (AP) can determine the counts of MU-capable user stations (STAs) active STAs in a BSS. Each MU-capable STA is configured for Multi-User Multiple-Input Multiple-Output (MU-MIMO) communications and/or Orthogonal Frequency-Division Multiple Access (OFDMA) communications. The AP can further determine ratios of PPDU time over an observation period of MU uplink (UL) and downlink (DL) communications, respectively. The AP can further determine an underutilization level of each available frequency subband, the underutilization level integrating the actual underutilization in terms of both spatial streams and frequency subbands. The DL and UL underutilization levels can be separately determined and reported. The MU BSS load information can be included in a beacon frame as a BSS load information element and distributed to user STAs periodically.