Multi-User Location Measurement Using Trigger Frames and Uplink Sounding
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Solution Overview
Problem
In high-density wireless network deployments, existing Wi-Fi technologies face inefficiencies in managing channel access, leading to reduced performance due to the high number of devices competing for the wireless medium, particularly in scenarios like hotspots and cellular offloading, where data rates are lower than those supported by IEEE 802.11ac standards.
Innovation Solution
The implementation of a High Efficiency (HE) Wireless Local Area Network (WLAN) network using a master station that employs non-contention based multiple access techniques, such as scheduled orthogonal frequency-division multiple access (OFDMA), during an air access control period, allowing multiple users to communicate simultaneously while the master station schedules transmissions, and using directional or omnidirectional antennas for spatial reuse.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If contention-based access methods are used in high-density wireless networks, then device simplicity is maintained, but system efficiency deteriorates due to excessive device competition for the wireless medium
Solution Approach 1:
The patent segments the wireless medium access into distinct time periods (first period for downlink MU-OFDMA, second period for uplink MU-OFDMA) and spatial resources (different spatial streams for different STAs). This segmentation allows multiple devices to transmit simultaneously without contention, resolving the efficiency-complexity contradiction by structuring access control in the time-spatial domain rather than through complex contention mechanisms.
Solution Approach 2:
The patent implements dynamic resource allocation where the AP dynamically assigns spatial streams and time periods to different STAs based on real-time network conditions. The master station dynamically adjusts which STAs transmit in which spatial streams during each period, enabling efficient medium utilization in high-density scenarios without requiring complex contention protocols.
2Productivity
If multiple users transmit simultaneously to improve capacity, then network performance improves, but signal interference increases
Solution Approach 1:
The patent introduces spatial dimension (spatial streams) as an additional resource dimension beyond traditional time-frequency resources. By assigning different spatial streams to different STAs simultaneously, the system achieves multiplexing gain without increasing interference in the time-frequency domain. This dimensional approach allows multiple users to transmit concurrently while maintaining signal integrity through spatial separation.
Solution Approach 2:
The patent applies local quality by assigning specific spatial streams to specific STAs based on their individual channel conditions and location. Each STA receives a dedicated spatial stream tailored to its local environment, allowing simultaneous transmissions without mutual interference. This localized resource allocation optimizes performance for each user while maintaining overall system capacity.
Data Source
AI summary
Embodiments of an access point (AP), station (STA) and method for multi-user (MU) location measurement are generally described herein. The AP may contend for a transmission opportunity (TXOP) to obtain access to a channel. The AP may transmit a trigger frame (TF) to initiate a multi-user (MU) location measurement during the TXOP. The AP may receive service requests for the MU location measurement from a plurality of STAs. The AP may transmit an MU acknowledgement (ACK) frame that indicates reception of the service requests. The AP may receive, from the STAs, uplink sounding frames that include per-STA timing information for the service requests and the MU ACK frame. The STA may determine location measurements for the STAs based on the per-STA timing information included in the uplink sounding frames.