Trigger-Based Ranging Sounding With OFDMA Subband Allocation
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently determining the location and proximity of wireless devices within a network, particularly when dealing with large quantities of devices, leading to inaccuracies and increased signaling overhead in trigger-based ranging procedures.
Innovation Solution
Implementing OFDMA sounding techniques with subband allocation and combined MU-MIMO to enable simultaneous location measurements across multiple devices, reducing clock drift and signaling overhead, and enhancing spectrum efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional trigger-based ranging procedures are used to determine location of wireless devices, then location information can be obtained, but signaling overhead increases and measurement accuracy decreases when dealing with large quantities of devices
Solution Approach 1:
The frequency bandwidth is divided into multiple subbands, and devices are grouped into sets where each set is assigned to a specific subband. This segmentation allows simultaneous location measurements across multiple devices in different subbands, reducing the sequential signaling overhead while maintaining measurement accuracy through frequency-diversity-based ranging calculations.
2Measurement precision
If sequential location measurements are performed for multiple wireless devices, then each device can be measured individually, but time differences increase leading to reduced measurement accuracy
Solution Approach 1:
Multiple location measurements are merged into simultaneous operations by assigning different device sets to different subbands. The access point transmits trigger frames for multiple device sets concurrently across different frequency subbands, and location measurements are performed simultaneously, eliminating sequential time delays while maintaining accuracy through frequency-based signal differentiation.
3Quantity of substance
If more wireless devices are supported in the network, then network capacity increases, but clock drift and measurement inaccuracies increase
Solution Approach 1:
The system transitions from time-sequential measurements to frequency-parallel measurements by utilizing multiple subbands. This dimensional change from temporal to spectral domain allows simultaneous measurement of multiple device sets, reducing the cumulative clock drift effect while supporting larger network capacity through frequency-based resource allocation.
4Loss of information
If conventional ranging procedures are used, then location information is obtained, but spectrum efficiency is reduced due to increased signaling overhead
Solution Approach 1:
The trigger frame structure is designed to serve multiple functions simultaneously: it identifies device sets, assigns subband allocations, and initiates sounding signal transmissions. This multi-functionality reduces redundant signaling overhead while maintaining comprehensive location measurement capabilities across multiple devices, thereby improving spectrum efficiency through consolidated control messaging.
Data Source
AI summary
This disclosure provides methods, components, devices, and systems for sounding for trigger-based ranging. Some aspects more specifically relate to a first wireless device dividing a frequency bandwidth available for ranging procedures into a plurality of subbands in accordance with orthogonal frequency-division multiple access (OFDMA) techniques. In some implementations, the first wireless device may transmit a trigger frame that assigns a subband to a respective neighbor wireless device. Each respective neighbor wireless device may transmit, during a same time occasion, a respective sounding signal via each respective subband allocated to the respective neighbor wireless device. In some implementations, the first wireless device may perform sounding procedures using combined multiple input multiple output (MIMO) and OFDMA techniques, where each neighbor wireless device may be assigned a respective spatial stream. Accordingly, the first wireless device may support sounding procedures for larger quantities of neighbor wireless devices.