D2D Distance Estimation Using Reference eNB Geometry
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Solution Overview
Problem
In a D2D environment, there is a need for a method to estimate the distance between device-to-device (D2D) UEs using information related to the distance aware through a reference eNB and distance information between reference eNBs, while also configuring transmission periodicity, coding rate, and transmit power differently based on the distance between D2D UEs.
Innovation Solution
A method where a first D2D UE receives a specific message from a second D2D UE containing first distance information related to the distance difference between the second D2D UE and at least three reference eNBs, and second distance information indicating the distance between these eNBs, and estimates the distance by measuring the distances between the reference eNBs using reference signals, forming circles and hyperbolas to determine the position of the second D2D UE, and adjusting transmission parameters accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If distance estimation between D2D UEs is performed using reference eNB information, then positioning accuracy is improved, but transmission complexity increases due to multiple parameter configurations
Solution Approach 1:
The transmission parameters are segmented into three distinct categories (transmission periodicity, coding rate, and transmit power) that can be independently configured based on distance ranges. This allows the system to manage complexity by handling each parameter separately rather than as a unified complex configuration.
Solution Approach 2:
Different transmission parameters are applied locally to different distance ranges. The system divides the coverage area into multiple distance ranges and configures appropriate parameters for each range, allowing optimized transmission characteristics for each local region rather than using uniform parameters globally.
2Productivity
If transmission parameters are configured differently based on distance, then communication efficiency is improved, but system complexity increases
Solution Approach 1:
The transmission parameters are made dynamic by allowing them to change based on the measured distance between D2D UEs. The system continuously monitors distance and adjusts transmission periodicity, coding rate, and power accordingly, enabling adaptive optimization rather than static configuration.
Solution Approach 2:
The system changes transmission parameters (periodicity, coding rate, power) based on distance conditions. By establishing correspondence between distance ranges and parameter sets, the system automatically selects appropriate parameters when UEs fall into specific distance ranges, improving communication efficiency without manual intervention.
3Adaptability or versatility
If multiple distance ranges are supported with different parameters, then service versatility is improved, but measurement and detection difficulty increases
Solution Approach 1:
The system performs preliminary configuration by establishing the correspondence between distance ranges and transmission parameters in advance. This pre-configuration allows the system to quickly determine appropriate parameters once distance is measured, rather than performing complex calculations or selections in real-time, thus reducing measurement and detection difficulty.
Data Source
AI summary
A method for estimating the distance between device-to-device (D2D) terminals in a wireless communication system according to the present specification, carried out by a first D2D terminal, is characterized by comprising the steps of: receiving, from a second D2D terminal, a particular message comprising first distance information, regarding the differences in distance between the second D2D terminal and at least three reference base stations configured thereby, and second distance information indicating the distances between said at least three reference base stations; measuring the distance to each reference base station; and estimating the distance to the second D2D terminal by means of the measured distance to each reference base station, first distance information and second distance information.