Group Handover for High-Speed Rail Mobile Relays
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Solution Overview
Problem
In high-speed rail systems, the frequent handover procedures of mobile relays as trains pass through base stations lead to inefficiencies in communication services, requiring a quick and reliable handover scheme to maintain uninterrupted connectivity for passengers.
Innovation Solution
A group handover method is introduced, where a control message is received by moving devices, allowing them to set a state for group handover and determine which devices can perform a coordinated handover, with a reconfiguration message triggering sequential handover procedures among mobile relays, optimizing handover decisions and path switching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional individual handover procedures are performed by each mobile relay separately, then handover reliability is maintained, but handover time increases and communication service continuity deteriorates
Solution Approach 1:
The patent merges multiple individual handover procedures into a single group handover operation. The source eNB processes handover requests for multiple mobile relays (MR1, MR2, MR3) simultaneously as a group, rather than sequentially. This combining approach reduces the overall handover time while maintaining reliability through coordinated execution of handover commands across all mobile relays in the group.
Solution Approach 2:
The patent implements preliminary actions by having mobile relays perform measurements and send measurement reports to the source eNB before the actual handover execution. The source eNB prepares handover decisions and sends handover commands to target eNBs in advance. This preliminary preparation enables the handover to be executed quickly when triggered, reducing the actual handover time while ensuring reliability through pre-validated handover parameters.
2Reliability
If sequential handover procedures are performed one-by-one, then handover reliability is maintained, but productivity of handover operations decreases
Solution Approach 1:
The patent combines multiple handover operations into a single group handover process. The source eNB sends a single group handover command that triggers simultaneous handover execution across multiple mobile relays (MR1, MR2, MR3). This merging of operations significantly improves handover productivity by processing multiple relays in parallel rather than sequentially, while maintaining reliability through coordinated command distribution and execution monitoring.
3Loss of time
If group handover is implemented for multiple mobile relays, then handover time is reduced and productivity improved, but system complexity increases
Solution Approach 1:
The patent segments the mobile relay system into distinct groups that can perform group handover independently. Each mobile relay (MR1, MR2, MR3) is identified and managed as a separate entity within the group, with the source eNB maintaining individual context information for each relay. This segmentation allows the group handover mechanism to scale without proportionally increasing complexity, as each relay follows the same standardized handover procedure within its group.
Solution Approach 2:
The patent implements a universal group handover mechanism that can handle multiple mobile relays with the same handover procedure. The source eNB and target eNBs are designed to support both individual and group handover operations using the same basic protocol framework. This universality reduces system complexity by avoiding the need for entirely separate mechanisms for different handover types, while still achieving reduced handover time through group-based parallel execution.
Data Source
AI summary
A method of enhancing handover by using chain handover over a wireless connection, for use in a plurality of moving devices, is introduced. In the method, a control message is received by one of a plurality of moving devices. A report message is transmitted by the one of the plurality of moving devices, in which the one of the plurality of moving devices sets in a state for group handover and represents all others of the plurality of moving devices for a handover decision. It is determined that a part or all of the plurality of moving devices are allowed to perform the group handover according to the report message. The part or all of the plurality of moving devices allowed to perform the group handoversequentially perform a handover procedure after receiving a reconfiguration message.