D2D Resource Allocation for Indoor Positioning Accuracy
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Solution Overview
Problem
Accurately determining the position of mobile devices in wireless networks is challenging, especially in indoor environments due to high penetration loss and Non-Line-of-Sight (NLOS) signal propagation, leading to coarse location accuracy.
Innovation Solution
The use of Device-To-Device (D2D) communications between mobile devices and the cellular network for resource allocation and signal location parameter exchange, establishing a D2D positioning zone with defined radio spectrum resources to improve location estimation, including the transmission of location beacons with signal location parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional network-based positioning methods are used, then infrastructure utilization is maintained, but location accuracy deteriorates in indoor and NLOS environments
Solution Approach 1:
The patent introduces D2D communication as an intermediary positioning method where nearby devices act as intermediaries to measure signal parameters. Instead of relying solely on network infrastructure signals that suffer from penetration loss and NLOS conditions, the system uses direct device-to-device measurements as mediators to determine location, thereby overcoming the harmful effects of indoor and NLOS signal propagation
Solution Approach 2:
The patent segments the positioning function by separating it from traditional network infrastructure dependency. By enabling devices to perform autonomous D2D measurements and calculations, the positioning capability is segmented into independent device-level operations rather than centralized network operations, allowing accurate positioning even when network signals are blocked
2Measurement precision
If D2D communication resources are allocated for positioning, then location determination accuracy is improved, but radio spectrum resource utilization increases
Solution Approach 1:
The patent makes radio spectrum resources multi-functional by allocating D2D resources that can serve both communication purposes and positioning purposes. The same D2D radio resources used for data transmission can simultaneously carry positioning reference signals and measurement information, eliminating the need for dedicated positioning-only spectrum and achieving universal resource utilization
Solution Approach 2:
The patent merges communication and positioning functions into a unified D2D framework. By combining location beacon transmissions with regular D2D communication protocols and resource allocation, the system achieves positioning functionality without requiring separate dedicated resources, thereby efficiently utilizing existing radio spectrum allocations for dual purposes
3Productivity
If D2D positioning zones are established with dedicated resources, then signal location parameter exchange efficiency is improved, but device complexity increases
Solution Approach 1:
The patent implements self-service mechanisms where devices autonomously perform positioning zone establishment, resource selection, and parameter exchange without requiring complex centralized coordination. Each device independently manages its D2D positioning operations, selecting resources and exchanging parameters autonomously, thereby improving efficiency while minimizing the complexity burden on individual devices and the network
Data Source
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AI summary
Techniques described herein may provide for the determination of the position of mobile devices based on information obtained through device-to-device (D2D) discovery or communications. Resource allocation schemes are described that allow efficient communication of signal location parameters, via D2D discovery, communications or newly defined physical channels, that may be used to estimate the position (or improve position estimation) of the mobile device.