Spatial Stream Determination for WLAN Bandwidth Adaptation
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Solution Overview
Problem
Wireless local area networks (WLANs) face challenges in efficiently managing bandwidth and response times due to multiple devices sharing resources, with limitations from communication protocols and hardware bandwidth, especially when operating with both new and legacy devices.
Innovation Solution
The proposed solution involves a radio architecture that determines the optimal number of spatial streams for different bandwidths and modulation and control schemes, using a method to adjust receive spatial streams based on bandwidth and modulation schemes, enabling efficient communication across various IEEE 802.11 standards, including IEEE 802.11ax, by incorporating advanced circuitry for front-end module, radio IC, and baseband processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple devices share the same wireless resources, then network coverage and device compatibility are improved, but bandwidth utilization and response times deteriorate
Solution Approach 1:
The patent segments the wireless medium into multiple spatial streams that can be independently allocated to different devices. By dividing the communication resources into separate spatial channels, the system enables multiple devices to share the network while maintaining high bandwidth utilization through parallel spatial multiplexing, thus resolving the contradiction between device compatibility and bandwidth efficiency
Solution Approach 2:
The patent implements dynamic adjustment of the number of spatial streams based on real-time channel conditions, device capabilities, and traffic demands. This dynamic resource allocation allows the system to adaptively optimize bandwidth utilization for each transmission while ensuring all devices can communicate, thereby resolving the trade-off between versatility and productivity
2Productivity
If the number of spatial streams is increased, then data throughput is improved, but device complexity and hardware requirements worsen
Solution Approach 1:
The patent applies local quality by allocating different numbers of spatial streams to different devices based on their individual capabilities and channel conditions. Rather than requiring all devices to support the maximum number of streams, the system optimizes each device's spatial stream configuration locally, enabling high throughput for capable devices while keeping hardware requirements manageable for others
Solution Approach 2:
The patent dynamically changes the parameter of spatial stream count based on channel quality indicators and device capabilities. By adjusting this parameter in real-time, the system achieves high data throughput when conditions permit while reducing complexity when hardware or channel constraints exist, thus resolving the contradiction between throughput and device complexity
3Productivity
If advanced modulation schemes are used, then spectral efficiency is improved, but reliability and compatibility with legacy devices worsen
Solution Approach 1:
The patent implements a universal communication framework that supports multiple modulation schemes simultaneously. The system can select from different modulation orders (e.g., QPSK, 16-QAM, 64-QAM, 256-QAM) based on channel conditions and device capabilities, ensuring both high spectral efficiency for capable devices and reliable communication for legacy devices, thus resolving the contradiction between efficiency and reliability
Data Source
AI summary
Methods, computer readable media, and apparatus for determining a receive (Rx) number of spatial streams (NSS) for different bandwidths (BWs) and modulation and control schemes (MCSs) are disclosed. An apparatus is disclosed comprising processing circuitry configured to decode a supported HE-MCS and a NSS set field, the supported HE-MSC and NSS set field received from an high-efficiency (HE) station. The processing circuitry may be further configured to determine a first maximum value of N receive (Rx) SS for a MCS and a bandwidth (BW), where the first maximum value of N Rx SS is equal to a largest number of Rx SS that supports the MCS for the BW as indicated by the supported HE-MCS and NSS set field; and, determine additional maximum values based on an operating mode (OM) notification frame, and a value of an OM control (OMC) field. Signaling for BW in 6 GHz is disclosed.