Single RLF Indication Message for Cellular Handover Optimization
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Solution Overview
Problem
Current methods for handling radio link failures (RLF) in cellular wireless communication systems face challenges in distinguishing between coverage holes and inappropriate handover parameters, leading to inefficient optimization of handover parameters and increased handover failure rates, with existing solutions experiencing difficulties in managing RLF reports and reducing unnecessary signaling.
Innovation Solution
A method is introduced where a single RLF indication message carrying a RLF report is generated and delivered to the source cell upon unsuccessful RRC re-establishment, with the second cell indicating whether the mobile station should attempt to deliver the report, thereby reducing signaling complexity and eliminating duplicate indications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple RLF indication messages are sent to distinguish coverage holes from inappropriate handover parameters, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent combines multiple RLF indication messages into a single RLF indication message that carries both the RLF report and the indication information. This merging approach reduces signaling complexity while maintaining the ability to accurately distinguish between coverage holes and inappropriate handover parameters, as the single message integrates all necessary information that would otherwise require multiple separate messages.
Solution Approach 2:
The RLF indication message is designed to serve multiple functions simultaneously: it delivers the RLF report from the mobile station to the network, provides indication information about the failure type, and enables the network to perform appropriate optimization actions. This multi-functional design eliminates the need for separate messages for different purposes, reducing overall signaling complexity while maintaining measurement precision.
2Reliability
If RLF reports are delivered through multiple messages, then reliability is improved, but loss of time increases
Solution Approach 1:
By merging the RLF report and indication information into a single RLF indication message, the patent reduces the total transmission time required to deliver all necessary information. The single message approach eliminates the sequential transmission delays that would occur with multiple separate messages, while maintaining reliability through the comprehensive information contained in the unified message structure.
3Reliability
If duplicate RLF indications are sent, then reliability is improved, but productivity decreases
Solution Approach 1:
The patent extracts the essential indication information about failure types directly into the RLF indication message itself, rather than sending duplicate separate indications. This extraction approach allows the network to identify failure events accurately while avoiding the productivity loss associated with processing duplicate messages, as the single message contains all necessary information for optimization decisions.
Data Source
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AI summary
The present invention relates to a method for providing information in a cellular wireless communication system, wherein each cell in said cellular wireless communication system is served by a base station, and said cellular wireless communication system employs a procedure in which a mobile station suffering from a radio link failure (RLF) while being connected to a cell may attempt to re-establish a connection in another cell, comprising the steps of: detecting a radio link failure (RLF) for said mobile station while connected to a first cell; requesting a radio resource control (RRC) re-establishment for said mobile station in a second cell after said radio link failure (RLF); and providing a single radio link failure (RLF) indication message to said first cell. Furthermore, the invention also relates to a method in a mobile station, a method in a base station, a computer program, a computer program product, a mobile station device and a base station device.