Sidelink Transmission Timing Synchronization for Remote and Relay UEs
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The transmission timing issue in Device-to-Device (D2D) or Vehicle-to-Everything (V2X) communication systems when a remote UE and a relay UE operate in different sidelink transmission modes causes communication disruptions.
Innovation Solution
A method where a remote UE, operating in sidelink transmission mode 2, receives a timing advance (TA) value from a relay UE operating in mode 1, determines its transmission timing by applying the TA to the sidelink synchronization signal reception timing, and adjusts its timing accordingly to synchronize with the relay UE, ensuring smooth communication by aligning subframe boundaries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a remote UE operates in sidelink transmission mode 2 and a relay UE operates in mode 1, then device-to-device communication can be established with extended coverage, but transmission timing mismatch occurs causing communication disruptions
Solution Approach 1:
The remote UE dynamically adjusts its transmission timing parameters by applying a timing advance value received from the relay UE. This parameter change aligns the remote UE's subframe boundaries with those of the relay UE, resolving the timing mismatch that occurs when operating in different sidelink transmission modes (mode 2 for remote UE, mode 1 for relay UE) and ensuring continuous reliable communication
2Area of stationary object
If different sidelink transmission modes are used for remote and relay UEs, then network coverage can be extended, but transmission timing alignment is lost
Solution Approach 1:
The relay UE provides feedback to the remote UE in the form of a timing advance value, which indicates the timing adjustment needed for the remote UE to align its transmissions with the relay UE's timing. This feedback mechanism enables the remote UE to operate in mode 2 (extended coverage) while maintaining precise timing alignment through continuous timing adjustments based on the received feedback
Data Source
Figure 1(a)~1(b)
Figure 2
Figure 3~4
AI summary
One embodiment of the present invention relates to a method for transmitting a side link signal in a wireless communication system by a UE operating in side link transmission mode 2, the method comprising: a step of receiving a predetermined signal by the UE; and a step of transmitting a side link signal on the basis of a first timing which is determined on the basis of the predetermined signal, wherein the first timing is determined differently depending on whether or not the UE establishes a connection with a relay UE.