Device-to-Device Distance Calculation Using Transmit Power
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Solution Overview
Problem
Existing device-to-device (D2D) communication methods inaccurately estimate transmission distances by only considering the impact on receive power without accounting for the transmit power, leading to inaccurate distance calculations.
Innovation Solution
A method and device where the first device sends transmit power information to the second device, allowing it to calculate the distance based on both transmit and receive power, thereby obtaining a more accurate distance measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If only receive power is considered for distance estimation, then the measurement process is simple, but the distance calculation accuracy deteriorates
Solution Approach 1:
The transmit device preliminarily obtains and transmits its transmit power information to the receive device before distance calculation. This preliminary action enables the receive device to later calculate accurate distance by combining receive power with the previously received transmit power information, resolving the contradiction between measurement simplicity and accuracy.
Solution Approach 2:
The system implements a feedback mechanism where the transmit device sends back its transmit power information to the receive device. This feedback loop allows the receive device to compensate for the limitations of using only receive power by incorporating the transmit power parameter, thereby improving distance calculation accuracy without significantly increasing overall system complexity.
2Measurement precision
If transmit power information is transmitted to the second device, then distance calculation accuracy is improved, but communication overhead increases
Solution Approach 1:
The transmit power information is integrated into the existing data transmission between devices. By making the data carrier serve multiple functions (both carrying payload data and transmit power information), the system avoids additional dedicated communication channels, thus improving measurement accuracy while minimizing the increase in communication overhead.
Solution Approach 2:
The patent merges the transmit power information transmission with the existing data communication process. The first device incorporates transmit power information into the data transmission to the second device, combining multiple functions into a single communication stream and thereby reducing overall communication overhead compared to separate dedicated messages.
Data Source
AI summary
A device-to-device (D2D) transmission distance obtaining method and a device, related to the field of communications technologies and applied to wireless communications, where the method includes obtaining, by a first device, transmit power information, where the transmit power information indicates a transmit power used by the first device for sending data to a second device, and sending, by the first device, the transmit power information to the second device such that the second device obtains a distance between the second device and the first device, where the distance between the second device and the first device is obtained according to the transmit power and receive power used by the second device for sending the data. Hence, a more accurate D2D distance can be obtained.