Connectionless Ranging via Advertising Channel Sounding
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Solution Overview
Problem
Existing wireless communication methods face inefficiencies in transferring channel sounding measurement data between devices for distance estimation, as conventional methods require establishing connections or using limited advertising messages, which are inconvenient for ranging applications.
Innovation Solution
Implementing a connectionless mode for radio devices to transmit and receive bi-directional channel sounding measurements at multiple frequencies, allowing for efficient data transfer and distance estimation using multi-carrier phase ranging with round trip timing estimation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional connection-based methods are used to transfer channel sounding measurements, then data transfer can be performed, but the device complexity and signaling overhead increase due to connection establishment requirements
Solution Approach 1:
The patent extracts the data transfer function from the connection-based protocol stack and implements it directly in the advertising layer. Channel sounding measurements are transferred by embedding them in advertising reports and scan response messages, eliminating the need for separate connection establishment while maintaining reliable data transfer for ranging applications
Solution Approach 2:
The patent uses advertising messages and scan response messages as intermediary carriers to transfer channel sounding measurements. These messages serve as mediators that enable data exchange between devices without requiring a persistent connection, thus reducing complexity while maintaining transfer reliability
2Ease of operation
If advertising messages are used for data transfer, then connection establishment is avoided, but the message size limitations and signaling efficiency are reduced
Solution Approach 1:
The patent segments channel sounding measurement data across multiple advertising messages and scan responses. When complete measurement sets exceed single message capacity, the data is divided and transmitted across multiple messages, ensuring complete information transfer while maintaining connectionless operation
Solution Approach 2:
The patent merges channel sounding measurement data with advertising report structures and scan response messages. By combining ranging data with existing advertising protocol elements, the system achieves efficient data transfer without requiring separate connection establishment or sacrificing message size efficiency
3Measurement precision
If channel sounding measurements are performed at multiple frequencies, then distance estimation accuracy is improved, but the measurement time and processing complexity increase
Solution Approach 1:
The patent performs channel sounding measurements at multiple frequencies in advance before distance estimation is required. By pre-collecting channel state information across multiple carrier frequencies and storing it in advertising messages, the system eliminates the need for time-consuming multi-frequency measurements at the moment of ranging, thus reducing measurement time while maintaining accuracy
Solution Approach 2:
The patent enables continuous channel sounding measurements to be performed in the background during normal advertising operations. Devices continuously measure channel state at multiple frequencies and update advertising reports with this data, maintaining measurement continuity without interrupting other operations, thus achieving high accuracy without significant time loss
Data Source
AI summary
According to an aspect, there is provided a first radio device for performing the following. The first radio device causes wireless transmission of one or more first advertising messages at one or more advertising radio frequencies using a connectionless mode of the first radio device. The radio device receives, for at least one first advertising message, a first scan request from a second radio device and transmits, for each first scan request, a first scan response to the second radio device. Based on one or more received first scan requests, the first radio device performs bi-directional channel sounding with the second radio device at one or more sounding radio frequencies. The first radio device receives, from the second radio device, at least one first message comprising information on second channel sounding measurements and transmits. to the second radio device, at least one second message comprising information on first channel sounding measurements performed by the first radio device.