D2D Reference Signal Subcarrier Mapping for PDoA Accuracy
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Solution Overview
Problem
Current wireless communication systems face challenges in accurately measuring the distance between user equipment (UEs) using reference signals (RS) for phase difference of arrival (PDoA) in device-to-device (D2D) communication, particularly in ensuring diversity of measurement across various frequencies and signal-to-noise ratios (SNR).
Innovation Solution
A method and device for mapping a reference signal (RS) by determining an optimal subcarrier index set based on a Golomb ruler, which ensures unique differences between subcarrier pairs, allowing for efficient RS transmission and reception across multiple symbols, adapting to varying UE speeds and network conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If reference signals are transmitted using conventional subcarrier allocation methods, then the transmission can be implemented with standard procedures, but the measurement diversity across various frequencies and SNR conditions is insufficient
Solution Approach 1:
The patent changes the parameters of subcarrier allocation by using Golomb ruler-based index sets instead of conventional sequential or uniform allocation. This transforms the subcarrier spacing pattern to create unique differences between all pairs of subcarriers, thereby improving PDoA measurement diversity and accuracy without requiring complex additional processing at the transmitter or receiver.
Solution Approach 2:
The patent pre-configures multiple Golomb ruler-based index sets in advance, where each index set contains subcarrier indexes with unique pairwise differences. These pre-configured sets are prepared beforehand and selected based on channel conditions, allowing the system to achieve optimal measurement diversity without real-time complex calculations.
2Adaptability or versatility
If the RS is mapped to all subcarriers in the resource block, then complete frequency coverage is achieved, but the unique frequency differences for diverse measurement are reduced
Solution Approach 1:
Instead of uniform subcarrier allocation, the patent applies local quality by selecting specific subcarriers based on Golomb ruler index sets. Each selected subcarrier position has a specific role in creating unique frequency differences, optimizing the local frequency structure to enhance measurement diversity while maintaining adequate overall frequency coverage through the distribution of selected subcarriers.
3Ease of manufacture
If conventional subcarrier allocation is used, then the implementation is straightforward, but the system cannot ensure unique differences between subcarrier pairs for accurate PDoA measurement
Solution Approach 1:
The patent pre-configures multiple Golomb ruler-based index sets in advance, where each index set contains subcarrier indexes with unique pairwise differences. These pre-configured sets are prepared beforehand and selected based on channel conditions, allowing the system to achieve optimal measurement diversity without real-time complex calculations.
Data Source
AI summary
Provided in various embodiments are a method by which a D2D terminal transmits a reference signal (RS) for a PDoA in a wireless communication system, and a device therefor. Disclosed are a method by which a D2D terminal transmits a reference signal (RS) for a PDoA, and a device therefor, the method comprising the steps of: determining, on the basis of the maximum value of a difference between indexes of subcarriers of a resource block for the transmission of a reference signal (RS), an index set for RS mapping among preconfigured index sets; mapping the RS to the subcarriers of the resource block having indexes corresponding to each of the indexes included in the index set for the RS mapping; and transmitting the resource block to which the RS is mapped, wherein the preconfigured index sets include indexes in which differences between two pairs of indexes are not the same for each number of indexes.