Movable Relay Handover Destination Determination
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Solution Overview
Problem
Movable relay apparatuses in communication systems face challenges in maintaining seamless handover of wireless communication connections between a wireless base station and communication terminals, especially when the relay apparatus is in motion, leading to potential disconnections if handover is not timely.
Innovation Solution
The relay apparatus transmits handover destination information to communication terminals without requiring measurement reports, using movement and speed determination, as well as radio wave reception strength and temporal change analysis, to identify optimal handover destinations, ensuring timely handovers and maintaining communication connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the relay apparatus uses conventional handover procedures requiring measurement reports from communication terminals, then handover accuracy can be maintained, but handover timing is delayed and communication disconnections occur when the relay apparatus moves
Solution Approach 1:
The relay apparatus proactively determines handover destination information based on its own movement state before the communication terminal needs to hand over. By performing the handover destination determination in advance and notifying the terminal, the system eliminates the time delay associated with terminal-based measurement reports and enables timely handover execution.
Solution Approach 2:
Instead of having the communication terminal determine handover destination based on measurement reports (terminal-centric approach), the invention inverts the approach by having the relay apparatus determine the handover destination based on its own movement state (relay-centric approach). This inversion allows the relay apparatus to proactively provide handover destination information to terminals, solving the timing issue.
2Loss of time
If the relay apparatus transmits handover destination information proactively without measurement reports, then handover timing is improved, but the complexity of determining optimal handover destinations increases
Solution Approach 1:
The relay apparatus acts as an intermediary that simplifies the handover process. Instead of requiring complex terminal-based measurements and calculations, the relay apparatus uses its own movement state information (a simpler data source) to determine handover destinations, thereby reducing overall system complexity while improving timing.
Solution Approach 2:
The invention changes the basis for handover destination determination from terminal-based measurement parameters to relay apparatus movement state parameters. This parameter change simplifies the determination process since the relay apparatus has direct access to its own movement state, avoiding the complexity of processing terminal measurements and reports.
3Loss of time
If the relay apparatus determines handover destinations based on its movement state, then handover timing is improved, but the accuracy of handover destination selection may be reduced compared to measurement-based methods
Solution Approach 1:
The relay apparatus performs preliminary determination of handover destinations using its movement state, which provides timely handover information. The system accepts that this preliminary determination may be less precise than measurement-based methods, but the timing improvement is prioritized to prevent communication disconnections during relay apparatus movement.
Data Source
AI summary
A movable relay apparatus for relay communication, the relay apparatus transmits handover destination information to a communication terminal. The handover destination information indicates a handover destination, which allows the communication terminal to carry out a handover.