D2D Proximity Determination via Path Loss Calculation
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Solution Overview
Problem
In D2D communication networks, existing technologies cannot accurately determine the proximity of User Equipment (UE) to another UE, which is essential for various proximity services and power management, such as geo-fencing and efficient data transmission.
Innovation Solution
A method that involves receiving a message from a second UE, measuring and processing the reception and transmission power information to calculate path loss, and subsequently determining the proximity of the second UE, allowing for accurate range determination and power adjustment for successful data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If D2D discovery is enabled for proximity detection, then UE can discover other UEs in its proximity, but the existing technology cannot accurately determine the proximity range
Solution Approach 1:
The patent applies feedback by having the discovering UE measure the received power of discovery signals from announced UEs and use this feedback information to estimate proximity. The received power measurement is fed back to the application layer to determine the range of the discovered UE, enabling accurate proximity determination while maintaining the simplicity of D2D discovery.
Solution Approach 2:
The patent replaces complex mechanical or infrastructure-based ranging mechanisms with wireless signal power measurement. Instead of using infrastructure references or complex time-of-flight measurements, the system uses the received power of discovery signals directly transmitted between UEs to determine proximity, simplifying the system while improving measurement precision.
2Measurement precision
If path loss calculation is performed using received power and transmission power, then accurate proximity can be determined, but additional power information processing is required
Solution Approach 1:
The patent applies self-service by having the discovering UE autonomously perform path loss calculation using locally available information (received power and transmission power). The UE uses its own measurements and the transmitted power information to calculate path loss and determine proximity without requiring network assistance or complex external processing, reducing device complexity while maintaining accuracy.
Solution Approach 2:
The patent changes the approach from direct distance measurement to path loss-based inference. By transforming the measurement parameter from direct distance to received power level, and using path loss as an intermediate parameter, the system achieves accurate proximity determination with simpler processing. The transmission power information serves as a reference parameter that enables path loss calculation without requiring complex measurements.
3Productivity
If transmission power is optimized based on determined proximity, then data transmission efficiency is improved, but power management complexity increases
Solution Approach 1:
The patent applies dynamics by making transmission power adaptive based on determined proximity. The discovering UE adjusts the transmission power for data communication according to the path loss calculated from discovery signal measurements. This dynamic power adjustment optimizes transmission efficiency for each link while using a standardized power management approach that does not significantly increase complexity.
Solution Approach 2:
The patent applies preliminary action by performing discovery signal transmission and path loss calculation before actual data communication. The power optimization parameters are determined in advance during the discovery phase, allowing the data transmission phase to proceed with optimized power settings without requiring complex real-time power management. This separates the power determination function from the data transmission function, reducing overall complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables precise proximity determination and power management, enhancing the effectiveness of D2D communication services by providing reliable range information for applications like geo-fencing and optimizing data transmission power.
Implementation Method 1
ascertaining a first power information of a signal at which the message is received at the first UE
Implementation Method 2
determining path loss based on processing the first power information and the second power information
Data Source
AI summary
The present disclosure may be applied to intelligent services based on the 5G communication technology and the IoT-related technology, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and safety services.The present invention describes a method of determining proximity of an entity in a device to device (D2D) communication network. The method comprises receiving by a first entity, a message from a second entity, ascertaining by the first entity, a first power information of a signal at which the message being received at the first entity, determining by the first entity, a second power information of the signal at which the message being transmitted by the second entity, determining by the first entity, path loss based on processing the first power information and the second power information, and determining by the first entity, the proximity of the second entity from the first entity based on the determined path loss.