D2D Timing Advance Control for Wireless Terminals
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current wireless communication systems face challenges in efficiently controlling Timing Advance (TA) for Device-to-Device (D2D) communication, leading to potential interference and delays in D2D signal transmission due to the lack of timely TA updates and alignment with legacy UL signals.
Innovation Solution
A method and apparatus that allow User Equipment (UE) to receive and apply Timing Advance (TA) values from a Base Station (BS) on D2D control channels, enabling efficient D2D data channel transmission while avoiding the application of TA values on the control channels, and allowing for autonomous TA updates using specific UL signals to maintain synchronization with the BS.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If Timing Advance (TA) values are applied to D2D control channels, then transmission timing alignment is improved, but control channel functionality deteriorates due to unnecessary TA application
Solution Approach 1:
The patent applies different TA handling rules to different channel types: D2D data channels receive TA values for timing alignment, while D2D control channels explicitly exclude TA application. This local differentiation ensures each channel type receives appropriate timing treatment based on its functional requirements.
2Measurement precision
If frequent RACH procedures are used to update TA values, then synchronization accuracy is improved, but power consumption increases
Solution Approach 1:
The transmitting UE autonomously determines and applies TA values for its D2D transmissions without requiring frequent RACH procedures. The UE uses received TA values from the serving BS and applies them to D2D data channels, enabling self-sufficient timing management that reduces signaling overhead and power consumption.
Solution Approach 2:
Instead of using full RACH procedures for every TA update, the patent uses partial action by having the BS provide TA values through existing downlink channels, and the UE applies these partially (only to data channels, not control channels). This reduces the excessive signaling that would otherwise be required.
3Device complexity
If TA values are not applied to D2D data channels, then control channel simplicity is improved, but D2D signal transmission quality deteriorates due to timing misalignment
Solution Approach 1:
The patent implements differentiated TA application: control channels maintain simplicity by excluding TA, while data channels achieve high reliability through TA application. This local quality differentiation allows each channel type to be optimized for its specific functional requirements.
Data Source
Figure 1
Figure 2(A)~2(B)
Figure 3
AI summary
Disclosed is a method for transmitting a signal by a terminal via a device to device (D2D) link in a wireless communication system. Specifically, the method comprises: a step for receiving information on a timing advance (TA) value from a base station; a step for transmitting the TA value to a counterpart terminal via a first D2D control channel; and a step for transmitting a D2D data channel based on the first D2D control channel to the counterpart terminal by applying the TA, wherein the TA is not applied to the first D2D control channel. In particular, when the information on the updated TA value is received from the base station, it is desirable to transmit the D2D data channel based on the first D2D control channel to the counterpart terminal by applying the updated TA, but in the case of applying the updated TA, not to apply the information on the TA value included in the first D2D control channel.