Source Base Station Handover Notification for LTE Scell Selection
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Solution Overview
Problem
In LTE and LTE-A systems, the target base station receives incomplete or unorganized cell switching information from the source base station, leading to inaccurate Scell determination and increased processing complexity, resulting in higher switching time delays.
Innovation Solution
The method involves the source base station notifying the target base station with the signal quality of the target Pcell, either through an optimum cell list or a predefined information cell, ensuring that only cells meeting specific signal quality criteria are included, thereby improving accuracy and reducing switching time delays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the source base station sends complete cell switching information including all measured cells, then the target base station has sufficient information for Scell determination, but the signaling overhead and processing complexity increase
Solution Approach 1:
The patent extracts only the necessary cell switching information (target Pcell and candidate Scell list) from the complete measurement report, excluding redundant data. This extraction principle reduces the information volume transmitted to the target base station while maintaining sufficient data for accurate Scell determination, thereby resolving the contradiction between reliability and processing complexity.
Solution Approach 2:
The patent segments the cell switching information into distinct components: target Pcell identification and candidate Scell list. This segmentation allows the target base station to process only relevant information for Scell determination without handling complete measurement data, reducing processing complexity while ensuring accurate Scell selection through targeted information provision.
2Loss of time
If the source base station sends unorganized cell switching information, then the signaling overhead is reduced, but the target base station experiences increased processing complexity and time delay
Solution Approach 1:
The source base station performs preliminary organization of cell switching information before transmission, pre-sorting candidate Scells based on signal quality metrics. This preliminary action ensures that the target base station receives already-processed, organized information, eliminating the need for additional sorting operations and thereby reducing switching time delay without increasing processing complexity.
3Reliability
If the source base station includes all measured cells in the switching information, then the target base station can make accurate Scell determination, but the signaling overhead increases
Solution Approach 1:
The patent applies the extraction principle by selecting only the most relevant cells (target Pcell and top candidate Scells) from the complete measurement report. This selective extraction provides sufficient information for accurate Scell determination while minimizing signaling overhead by excluding redundant measurement data that would not contribute to the decision-making process.
4Loss of information
If the target base station receives incomplete cell switching information, then the signaling overhead is reduced, but the Scell determination accuracy decreases
Solution Approach 1:
The source base station performs preliminary filtering and organization of cell measurement data before transmission, ensuring that only the most relevant and accurate information (target Pcell and high-quality candidate Scells) is included. This preliminary action maintains Scell determination accuracy while reducing signaling overhead by pre-processing the data to include only essential information.
Data Source
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AI summary
The present invention provides a method of notifying switching information and a base station. The method comprises: a source base station switching a user equipment (UE) to a target Pcell of a target base station; and the source base station notifying the target base station of signal quality of the target Pcell. The present invention ensures that the target base station can efficiently select secondary service cells according to the transmitted information, and reduces time delay.