IMSI Acquisition via GUTI-IMSI Mapping in LTE Signaling
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Solution Overview
Problem
In LTE networks, the S1-MME interface signaling monitoring system lacks International Mobile Subscriber Identity (IMSI) information, making it impossible to directly associate subscriber identities with billing, due to the use of temporary Globally Unique Temporary UE Identities (GUTIs) instead of IMSIs, leading to incomplete billing and poor network quality.
Innovation Solution
An IMSI acquisition method and device that collects S1-MME interface signaling and associated first interface signaling, acquires identities, associates them to generate a subscriber identity table, and queries this table to obtain the corresponding IMSI, ensuring IMSI information is included in billing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If temporary identities GUTIs are used in S1-MME interface signaling to protect air interface security, then subscriber identity security is improved, but the ability to acquire IMSI for billing association deteriorates
Solution Approach 1:
The patent uses GUTI as an intermediary identifier in S1-MME signaling to protect security, while introducing a mapping mechanism that associates GUTI with IMSI through a correlation table. This allows the system to maintain security using temporary identities while still enabling billing association through the intermediary mapping relationship.
Solution Approach 2:
The patent creates a copy of the subscriber identity mapping relationship by building a correlation table that stores the correspondence between GUTI and IMSI. This copy enables billing systems to access IMSI information without requiring direct transmission of IMSI in S1-MME signaling, thus maintaining both security and billing capability.
2Reliability
If IMSI is not transmitted in S1-MME interface signaling, then signaling security is improved, but billing completeness deteriorates
Solution Approach 1:
The patent performs preliminary action by establishing a GUTI-IMSI mapping correlation table before billing processing. This pre-established mapping relationship enables the billing system to retrieve IMSI information on-demand without requiring direct IMSI transmission in signaling, thus ensuring both security and billing completeness.
Solution Approach 2:
The correlation table acts as an intermediary storage mechanism that bridges the gap between secure signaling (using GUTI) and complete billing (requiring IMSI). The mapping table allows indirect access to IMSI information without compromising signaling security.
3Loss of information
If GUTI is used instead of IMSI in signaling processes, then subscriber privacy is improved, but billing association capability deteriorates
Solution Approach 1:
The patent creates a copied mapping relationship between GUTI and IMSI in a correlation table, enabling billing systems to perform associations using the temporary identifier GUTI while internally resolving to the permanent identifier IMSI through the copied mapping data.
Solution Approach 2:
The correlation table serves as an intermediary data structure that simplifies billing association operations. Instead of requiring direct IMSI access, the billing system can use GUTI as input and retrieve the corresponding IMSI through the intermediary mapping table, making the process easier while maintaining privacy.
Data Source
AI summary
Embodiments of the present disclosure disclose an IMSI acquisition method and device, and a signaling monitoring system. The IMSI acquisition method provided by the embodiment of the present disclosure includes: collecting an S1-MME interface signaling and a first interface signaling which is associated with the S1-MME interface signaling; acquiring a first identity from the S1-MME interface signaling; acquiring an IMSI and a second identity from the first interface signaling, herein the second identity is an identity which is associated with the first identity; associating the first identity, the second identity and the IMSI; and acquiring the corresponding IMSI according to an association result and the first identity in the S1-MME interface signaling.