Parallel Frequency Signal Exchange for Faster Indoor Positioning
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Solution Overview
Problem
Existing low-power narrowband wireless technologies face challenges in reducing measurement time for indoor positioning, such as ranging and direction finding, which are essential for accurate device location determination.
Innovation Solution
A communication method involving a first device that sends and receives signals simultaneously to and from multiple devices using different frequencies within a shared frequency band, allowing for parallel signal sending and receiving, thereby reducing the time required for measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If signals are sent one by one in sequence to multiple devices, then device complexity is reduced, but measurement time increases significantly
Solution Approach 1:
The patent combines multiple sequential signal exchange operations into a single parallel operation by assigning different frequency resources to different target devices. The first device simultaneously exchanges signals with second and third devices using frequency-division multiplexing, where P first signals are sent to the second device and Q second signals are sent to the third device in the same time slot but on different frequencies. This merging of operations reduces measurement time from sequential to parallel execution.
Solution Approach 2:
The patent introduces frequency as an additional dimension for signal differentiation. Instead of using only time to separate signals to different devices (sequential approach), the invention adds frequency as a second dimension, allowing simultaneous signal transmission on different frequency carriers. This dimensional expansion enables parallel measurement operations without increasing time duration.
2Productivity
If parallel signal sending is implemented to reduce measurement time, then productivity improves, but device complexity increases
Solution Approach 1:
The patent segments the frequency band into multiple sub-bands or frequency resources, assigning specific frequency ranges to different target devices. The first device divides available frequency resources such that P first signals occupy certain frequency portions for the second device, while Q second signals occupy other frequency portions for the third device. This segmentation allows independent frequency resource management for each device pair, reducing overall system complexity.
Solution Approach 2:
The patent creates a universal frequency-division multiplexing framework that can handle an arbitrary number of device pairs simultaneously. The same frequency division mechanism works for any combination of P and Q signals to any number of target devices, making the system scalable and multi-functional. This universal approach reduces complexity by using a single standardized method rather than device-specific protocols.
Data Source
AI summary
Embodiments of this disclosure provide a communication method, a communication apparatus, and a communication system. A first device sends signals to a plurality of other devices and the plurality of other devices sends signals to the first device to implement signal parallel sending. The first device transmits multiple signals in a frequency band, which includes sending P first signals to a second device and Q second signals to a third device. The frequencies of the P first signals differ from those of the Q second signals, but both sets are within the same frequency band. The first device then receives P third signals from the second device and Q fourth signals from the third device, with the received frequencies matching the transmitted frequencies for each respective set.