D2D Synchronization Using Primary Cell Frequency and Non-Serving Cell Time
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Solution Overview
Problem
Current D2D operation in wireless communication systems faces challenges in performing downlink measurement and synchronization when using a carrier wave other than the primary carrier, especially when the user equipment (UE) is outside the coverage of the serving cell, making it difficult to establish effective D2D communication.
Innovation Solution
The method involves applying frequency synchronization based on a primary cell and time synchronization based on a non-serving cell of a different frequency to enable D2D operation, allowing the UE to transmit signals using a carrier other than the primary carrier, and adjusting synchronization values to ensure effective D2D signal transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If D2D operation is performed using a carrier wave other than the primary carrier wave, then the coverage and versatility of D2D communication is improved, but the difficulty of performing downlink measurement and synchronization increases
Solution Approach 1:
The patent introduces a serving cell as an intermediary that provides downlink measurement and synchronization signals for D2D operations on non-primary carriers. The serving cell acts as a mediator that enables the UE to perform measurements and synchronize timing even when D2D communication occurs on a carrier where no serving cell is present, thus resolving the measurement and synchronization difficulty without limiting D2D versatility
2Area of stationary object
If D2D operation is performed outside the serving cell coverage, then the coverage extension capability is improved, but the reliability of synchronization and measurement deteriorates
Solution Approach 1:
The patent applies preliminary action by having the UE perform downlink measurement and synchronization with the serving cell before engaging in D2D operations on non-primary carriers or outside serving cell coverage. The UE utilizes previously acquired synchronization information and measurement data from the serving cell to maintain reliable D2D communication even when operating outside the serving cell's direct coverage area
Data Source
AI summary
Provided are a method for performing device-to-device (D2D) operation of a terminal in a wireless communication system, and a terminal using the same. The method is characterized by applying frequency synchronization on the basis of a primary cell of a first frequency, applying time synchronization on the basis of a non-serving cell of a second frequency for which D2D operation is to be performed, and performing the D2D operation on the basis of the frequency synchronization and the time synchronization.