Base Station Handover via Uplink Radio Evaluation
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Solution Overview
Problem
Current radio communication systems, such as OFDM-based LTE, lack the capability to evaluate essential information for successful handovers, including interference, uplink channel quality, and timing advance, as this information is only locally available within each base station.
Innovation Solution
Implementing a method where base stations exchange information by providing User Equipment-specific details to candidate base stations, allowing them to evaluate uplink radio conditions and send feedback for handover decisions, enabling thorough evaluation and improved handover efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If base stations keep information locally available, then information security and system simplicity are maintained, but handover evaluation capability is lost
Solution Approach 1:
The source base station acts as an intermediary that collects UE-specific information from the UE and distributes it to candidate base stations. This mediator approach enables candidate base stations to evaluate uplink radio conditions without directly receiving information from UEs, simplifying the overall system architecture while maintaining handover evaluation capability.
Solution Approach 2:
The information exchange mechanism is segmented into distinct functional components: information collection at the source base station, information distribution to candidate base stations, and localized evaluation at each candidate base station. This segmentation allows each component to operate independently while contributing to the overall handover evaluation capability.
2Measurement precision
If base stations exchange UE-specific information, then handover evaluation accuracy is improved, but network complexity and signaling overhead increase
Solution Approach 1:
The patent extracts only the essential UE-specific information needed for handover evaluation (such as UE identifiers, uplink scheduling information, and power control parameters) from the complete set of available information. This selective extraction reduces signaling overhead while maintaining sufficient accuracy for uplink radio condition evaluation at candidate base stations.
3Reliability
If candidate base stations evaluate uplink radio conditions, then handover decision quality is improved, but processing load and evaluation time increase
Solution Approach 1:
Candidate base stations perform preliminary evaluation of uplink radio conditions by analyzing received UE-specific information and measuring uplink signal parameters before handover execution. This preliminary action allows the source base station to make informed handover decisions without waiting for actual handover execution, reducing overall handover time while maintaining decision quality.
Data Source
AI summary
A method for handover of a User Equipment from a source base station to a target base station. The proposed method comprises providing User Equipment specific information from the source base station to at least one candidate base station, evaluating an uplink radio situation during uplink transmission of the User Equipment to the source base station by the at least one candidate base station, sending information related to the evaluation to the source base station by the at least one candidate base station, and performing a handover decision by the source base station based on the evaluation.