RLF Report Routing via UE Authentication and CGI
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Solution Overview
Problem
Existing methods for processing Radio Link Failure (RLF) reports in Self-Optimization Networks (SON) face challenges in determining the correct base station to send RLF reports due to overlapping Physical Cell Identifiers (PCI), leading to potential incorrect determinations and adverse network performance.
Innovation Solution
The method involves authenticating User Equipment (UE) by sending authentication information in RRC re-establishment requests, allowing the base station to correctly determine the cell experiencing RLF even when multiple cells share the same PCI, and sending RLF reports to all corresponding base stations for accurate context determination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If Physical Cell Identifier (PCI) is used to identify cells for RLF report routing, then cell identification is simplified, but incorrect determination occurs when multiple cells share the same PCI
Solution Approach 1:
The patent introduces Cell Global Identifier (CGI) as an intermediary element to resolve the ambiguity caused by duplicate PCIs. When multiple cells share the same PCI, the CGI serves as a unique mediator that enables precise identification of the target cell for RLF report routing, eliminating the incorrect determination problem while maintaining the simplicity of PCI-based initial identification.
2Reliability
If RLF report is sent to all base stations with same PCI, then correct cell determination is achieved, but network signaling overhead increases
Solution Approach 1:
The patent applies partial action by sending RLF reports selectively rather than universally. The eNB uses CGI to determine whether duplicate PCI cells exist, and only sends reports to base stations that are actually needed for cell determination. This avoids the excessive signaling overhead of sending reports to all base stations with the same PCI while ensuring accurate cell determination.
Solution Approach 2:
The patent implements a feedback mechanism where the eNB receives CGI information from the UE, uses it to determine the appropriate target cell, and then routes the RLF report accordingly. This feedback loop enables intelligent decision-making about report routing, reducing unnecessary signaling while maintaining accuracy.
3Measurement precision
If authentication information is added to RRC re-establishment requests, then UE authentication accuracy improves, but message complexity increases
Solution Approach 1:
The patent applies preliminary action by incorporating authentication information into the RRC re-establishment request message in advance, before the actual authentication process occurs. This allows the eNB to verify UE identity early in the re-establishment procedure, ensuring accurate authentication while maintaining a streamlined message structure that doesn't require complex post-processing.
Data Source
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AI summary
A method and a system for processing a Radio Link Failure (RLF) report, where when a User Equipment (UE) encounters an RLF in a first cell controlled by a first evolved base station and selects a second cell controlled by a second evolved base station to re-establish an Radio Resource Connection (RRC), are provided. The method includes sending, by the second evolved base station, the RLF report to every corresponding evolved base station according to the PCI of the first cell having been received from the UE, where the PCI of the first cell, the PCI of a second cell, the CRNTI of the UE in the first cell, and UE authentication information are carried in the RLF report, and authenticating, by every evolved base station the UE according to the UE authentication information. Another method for processing an RLF report, and two methods for adjusting a mobile parameter, are also provided.