Target Base Station Handover Report Routing via Location Information
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Solution Overview
Problem
In mobile communication systems, particularly in SAE systems, there is a challenge in transmitting handover and radio link failure (RLF) reports across different radio access technologies (RATs) due to the lack of location information about the source cell, leading to issues with routing these reports effectively, which affects mobility robustness optimization and system performance.
Innovation Solution
A method where a target base station obtains location information of the source cell or UE history cell and uses this information to transmit handover and RLF reports to the source base station or core network, enabling accurate routing through the core network, even in scenarios without an X2 interface, by utilizing the obtained location information to determine the global base station identity and routing details.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the target base station transmits handover reports without location information of the source cell, then the transmission process is simplified, but the report cannot be routed to the correct source base station
Solution Approach 1:
The source base station performs preliminary action by including location information of the source cell in the handover request message before the handover occurs. This allows the target base station to have the routing information ready when needing to send handover reports, eliminating the need for complex real-time location queries while ensuring accurate report delivery.
2Reliability
If the target base station obtains and stores location information of all possible source cells, then report routing accuracy is improved, but the device complexity and memory requirements increase
Solution Approach 1:
The patent extracts only the necessary location information (source cell global identifier and location information) from the complete source cell data and includes it in the handover request message. This selective extraction provides sufficient routing information without requiring the target base station to store comprehensive data about all possible source cells.
3Measurement precision
If operator configuration is increased to provide detailed location information for all cells, then report transmission accuracy improves, but the configuration workload and operational complexity increase
Solution Approach 1:
The system implements self-service by automatically generating and including the location information of the source cell in the handover request message during the handover procedure. This eliminates the need for manual operator configuration of location information, as the network elements automatically provide the necessary routing data based on the handover context.
Data Source
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AI summary
A method for transmitting a handover report and for transmitting a radio link failure (RLF) report are provided. The method includes obtaining, by a target base station, at least one of location information of a source cell or location information of a user equipment (UE) history cell during a handover procedure, and transmitting, by the target base station, the handover report to at least one of a source base station or to a base station where the UE history cell is located, according to the obtained at least one of location information of the source cell or the location information of the UE history cell, wherein the handover report including at least one of an unnecessary handover report, a too early handover report, or a handover to wrong cell report.