Common Group Cell Identifier for High-Speed Train Handovers
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Solution Overview
Problem
High-speed mobile wireless communication devices experience frequent handovers when moving between cells, leading to inefficient communication services and dropped calls, particularly on high-speed trains where the handover process is too slow to keep up with the train's movement.
Innovation Solution
Implementing a mobile relay that communicates with adjacent base stations using a common group cell identifier, allowing it to monitor changes in the group cell ID and only initiate handovers when the ID changes, thereby reducing unnecessary handover procedures and maintaining continuous communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional handover procedures are used for high-speed mobile devices, then communication coverage is maintained, but handover frequency increases and system efficiency decreases
Solution Approach 1:
The patent merges multiple adjacent cells into a single handover domain by assigning them a common handover cell identifier. This allows the mobile relay to treat multiple cells as one logical cell, eliminating the need for frequent handovers when moving between these cells at high speed, thus resolving the contradiction between maintaining communication reliability and preserving system efficiency
Solution Approach 2:
The common handover cell identifier serves multiple functions: it identifies the handover domain, triggers handover decisions, and enables the mobile relay to distinguish between intra-domain and inter-domain movements. This universal identifier resolves the contradiction by providing a single mechanism that maintains reliability while reducing unnecessary handovers that harm efficiency
2Reliability
If frequent handovers are performed to maintain coverage, then communication continuity is preserved, but handover processing overhead increases
Solution Approach 1:
By combining multiple cells under a common handover cell identifier, the patent reduces the number of handover events the mobile relay must process. The mobile relay only initiates handover when exiting the handover domain, not when moving between individual cells within the domain, thus preserving communication continuity while minimizing processing overhead
Solution Approach 2:
The system pre-configures the mobile relay with the common handover cell identifier and the list of cells within the handover domain before the mobile relay enters high-speed movement. This preliminary configuration allows the mobile relay to make efficient handover decisions based on simple identifier comparison rather than complex real-time evaluations, reducing processing time while maintaining continuity
Data Source
AI summary
A common group cell identifier is transmitted by adjacent base stations. Handover processing is minimized for mobile relays traveling along a predetermined path that traverses the adjacent base stations. A first base station along the path transmits a group cell identifier and a first single cell identifier within a first service area. An adjacent base station transmits the group cell identifier and a second single cell identifier within a second service area that at least partially overlaps the first service area. The mobile relay monitors the group cell identifier in certain situations and only performs a handover when the group cell identifier changes. As a result, no handovers are initiated as the mobile relay travels down the path since the group cell identifier transmitted by the base stations along the path are the same.