D2D Handover Synchronization for Aerial Vehicle Reliability
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Solution Overview
Problem
Aerial vehicles with fast movement speeds experience frequent cell handovers due to Line of Sight (LOS) paths, leading to frequent interruptions in data channel transmission, which do not meet the stability and time delay requirements of high-demand services in traditional D2D communication methods.
Innovation Solution
A method that configures resources for D2D transmission after handover by the target cell, synchronizing with the target cell during handover to avoid interruptions and interference, and performs handovers only when both the aerial vehicle and ground terminal meet specific conditions, ensuring stability and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional cell handover method is used for aerial vehicles with fast movement speed, then the aerial vehicle can maintain connection with base station, but frequent handovers cause frequent interruptions in data channel transmission
Solution Approach 1:
The patent applies preliminary action by performing handover preparation in advance. The network side device determines a target cell for handover and notifies the user equipment before the actual handover execution. This allows the data channel transmission to be maintained continuously during the handover process, avoiding interruptions that would occur with traditional simultaneous handover and transmission methods.
Solution Approach 2:
The patent segments the handover process into distinct phases: handover decision making by the network side device, handover notification to the user equipment, and subsequent data channel transmission. This segmentation allows the handover control and data transmission to be decoupled, enabling continuous transmission during the handover transition without interruption.
2Reliability
If D2D UE reinitiates cell reselection process at each handover, then connection can be reestablished, but data channel transmission is interrupted during reestablishment
Solution Approach 1:
The network side device performs preliminary determination of the target cell and sends notification to the user equipment before handover execution. This preliminary action eliminates the need for D2D UE to reinitiate cell reselection at each handover, thereby maintaining data channel transmission continuity while ensuring reliable connection reestablishment.
Solution Approach 2:
The network side device acts as an intermediary that coordinates between the source cell and target cell during handover. By notifying the user equipment of the target cell in advance, the network side device enables seamless handover without requiring the D2D UE to perform disruptive cell reselection, thus maintaining data transmission continuity.
3Speed
If aerial vehicle moves fast with LOS path, then communication coverage can be maintained, but frequent handovers occur among multiple cells
Solution Approach 1:
The network side device performs preliminary determination of optimal target cells based on the aerial vehicle's high-speed movement trajectory and LOS path characteristics. By predicting and preparing handover targets in advance, the system reduces unnecessary frequent handovers while maintaining reliable communication coverage during fast movement.
Solution Approach 2:
The patent changes the handover parameters and criteria based on the aerial vehicle's high-speed characteristics and LOS path. Instead of using traditional handover thresholds that cause frequent switches, the system adjusts parameters to accommodate fast movement, reducing handover frequency while maintaining connection reliability through coordinated network-side preparation.
Data Source
AI summary
The present disclosure discloses a method and a device in a User Equipment (UE) and a base station used for wireless communication. The UE first receives a first signaling and a second radio signal, and then transmitting a first radio signal on a sidelink. The first signaling is correlated to a first synchronization sequence. The first signaling is used for determining at least one of {first signature sequence, second synchronization sequence}. The first signature sequence is used for generating the first radio signal. The receiving timing of the second radio signal is used for determining the transmitting timing of the first radio signal. The second radio signal is associated with the second synchronization sequence. The first synchronization sequence differs from the second synchronization sequence. The first operation is transmitting, or the first operation is receiving. According to the present disclosure, both system performance and transmission efficiency are improved.