Mobile Relay Node Handover via Donor Cell Filtering
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Solution Overview
Problem
In LTE Advanced systems, mobile relay nodes (MRNs) installed on high-speed vehicles face challenges with handover due to inaccurate measurements and resource wastage, as existing measurement mechanisms are less effective and time-consuming, and cannot distinguish between donor and non-donor base stations, leading to potential handover failures.
Innovation Solution
A communication system and method that involve a base station and mobile relay node collaborating to identify and select a target cell from a list of capable donor base stations, performing filtered measurements and reporting, and executing handovers only to cells that provide donor services, thereby reducing handover failures and resource usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If existing measurement mechanisms are used for mobile relay nodes, then handover can be triggered based on neighbour cell measurements, but measurement accuracy deteriorates in high-speed environments and handover reliability decreases
Solution Approach 1:
The patent applies local quality by differentiating the treatment of measurement events based on the type of neighbour cell. Measurement events triggered by cells identified as donor cells are processed differently from those triggered by non-donor cells. Specifically, the system filters measurement reports to only consider events triggered by donor cells, thereby improving handover reliability in high-speed environments where measurement accuracy deteriorates.
2Adaptability or versatility
If all neighbour cells are measured for handover triggers, then comprehensive handover options are available, but resource wastage increases due to unnecessary measurements and signaling
Solution Approach 1:
The patent extracts the essential information needed for handover decisions by filtering measurement reports to only include events triggered by donor cells. This extraction process removes unnecessary measurement data and signaling related to non-donor cells, thereby reducing resource wastage while maintaining comprehensive handover options through the preserved donor cell measurement events.
Solution Approach 2:
The system performs preliminary identification of donor cells before processing measurement events. By pre-determining which neighbour cells are capable of providing donor services, the system can selectively process only the relevant measurement events, avoiding unnecessary measurements and signaling resources while maintaining adaptability for comprehensive handover when needed.
3Adaptability or versatility
If measurement events are triggered by any neighbour cell, then all potential handover targets are considered, but handover failures increase when neighbour cells cannot provide donor services
Solution Approach 1:
The patent applies local quality by differentiating the processing of measurement events based on the triggering cell's capability. Measurement events triggered by donor cells are processed for handover, while events triggered by non-donor cells are discarded. This selective processing ensures handover reliability by preventing failures associated with attempting handover to cells that cannot provide donor services.
Data Source
AI summary
A system is disclosed in which a base station initiates a handover of a mobile relay node associated with the base station. The base station obtains information that identifies at least one further base station, and that indicates that the at least one further base station is capable of providing donor services to the mobile relay node. When the base station determines that the mobile relay node requires handover, it selects, from at least one cell of the at least one further base station identified by the obtained information, a target cell for handover of the mobile relay node, and performs handover of the mobile relay node to the selected target cell.