D2D UE Timing Advance Signaling for Wireless Communication
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Solution Overview
Problem
The challenge in Device-to-Device (D2D) communication systems is determining whether to apply a Timing Advance (TA) effectively, which is crucial for efficient data transmission and synchronization among devices, but existing methods lack clarity on how to implement TA in D2D communication environments.
Innovation Solution
The proposed method involves a D2D UE applying a TA based on transmission modes, with TA indicators being signaled through physical-layer or higher-layer signals, allowing D2D Rx UEs to adjust their reception timing accurately, and configuring resource pools and subframes to manage interference and synchronization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If Timing Advance is applied in D2D communication to improve timing alignment, then data transmission efficiency is improved, but device complexity increases due to additional signaling and configuration requirements
Solution Approach 1:
The patent applies Timing Advance selectively based on transmission mode. In transmission mode 1 where the eNB schedules resources, TA is applied to align timing. In transmission mode 2 where UEs autonomously select resources, TA is not applied. This local differentiation resolves the contradiction by applying complexity only where necessary for improved efficiency.
Solution Approach 2:
The patent segments D2D communication into different transmission modes (mode 1 and mode 2) with different TA application rules. This segmentation allows the system to optimize for efficiency in mode 1 while avoiding unnecessary complexity in mode 2, thereby resolving the technical contradiction.
2Reliability
If Timing Advance is applied to ensure accurate timing alignment, then synchronization is improved, but interference management becomes more difficult due to additional timing adjustments across resource pools
Solution Approach 1:
The patent configures different TA application rules for different resource pools and subframes. Some resource pools have TA applied while others do not, depending on whether they are used for mode 1 or mode 2 transmission. This local quality approach improves synchronization where needed while simplifying interference management in autonomous resource selection pools.
3Productivity
If Timing Advance indicators are signaled through physical-layer signals to improve timing accuracy, then data transmission rate is improved, but overhead increases reducing network capacity
Solution Approach 1:
The patent segments the signaling approach by TA indicator type. Type 1 TA indicators are used in specific scenarios while type 2 TA indicators are used in others, allowing the system to optimize between accuracy and overhead based on the specific transmission scenario and resource pool configuration.
Data Source
Figure 1(a)~1(b)
Figure 2
Figure 3~4
AI summary
An embodiment according to the present invention, with respect to a method for a device-to-device (D2D) UE for transceiving a signal, comprises the steps of: receiving a D2D communication resource configuration; and transmitting a D2D communication signal on the basis of the D2D communication resource configuration, wherein if the UE transmits a D2D communication signal by means of a resource indicated by a base station, then the D2D communication signal is transmitted in a first timing determined from a value indicating a timing offset between uplink and downlink radio frames (NTA), and if the UE selects a resource which will transmit the D2D communication signal, then the D2D communication signal is transmitted in a second timing determined without regard to the value indicating the timing offset between the uplink and downlink radio frames (NTA).