GUTI Update Mechanism for Small Cell Location Privacy
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In a small cell environment, the protection of user equipment (UE) location information is challenging due to the ease of identifier interception, and existing methods do not effectively update temporary identifiers like GUTI in high-density small cell scenarios, exposing users to security risks.
Innovation Solution
A method for dynamically updating the globally unique temporary identifier (GUTI) based on predetermined update periods and mobility conditions, allowing the UE to proactively manage GUTI changes and reduce exposure in high-density small cell environments, without requiring complex computations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If small cells are deployed in high density to increase data rate and quality of experience, then network capacity and throughput are improved, but UE location privacy protection deteriorates due to easier identifier interception
Solution Approach 1:
The patent implements periodic updates of the GUTI identifier at predetermined intervals. The MME sends update period information to the UE, which then proactively requests GUTI updates when the period is reached. This periodic renewal of temporary identifiers prevents long-term tracking and interception, directly addressing the security risk introduced by high-density small cell deployment while maintaining network capacity benefits.
Solution Approach 2:
The patent introduces dynamic GUTI update mechanisms where the update timing is not fixed but determined by predetermined periods and proactive UE requests. The system adapts identifier freshness based on deployment scenarios, allowing flexible balance between security requirements and network efficiency in high-density small cell environments.
2Object-affected harmful factors
If GUTI update frequency is increased to improve location privacy protection, then security is improved, but UE battery consumption and computational load increase
Solution Approach 1:
The MME provides predetermined update period information to the UE in advance during initial attachment or reattachment. The UE uses this pre-configured information to determine when to proactively request GUTI updates, avoiding frequent unnecessary updates and reducing battery consumption while still maintaining adequate security protection.
Solution Approach 2:
The UE autonomously determines when to request GUTI updates based on the predetermined update period information received from the MME. This self-service mechanism allows the UE to manage its own identifier updates without continuous network signaling, reducing both computational load and energy consumption compared to network-controlled frequent updates.
3Device complexity
If conventional static GUTI allocation is used in small cell environments, then device complexity is reduced, but location privacy protection becomes insufficient due to identifier reuse across multiple cells
Solution Approach 1:
Instead of complex dynamic allocation across multiple cells, the patent uses periodic GUTI updates at predetermined intervals. This simpler approach ensures that even if the same GUTI is allocated in different small cells, its validity period is limited, preventing long-term location tracking while maintaining manageable device complexity.
Data Source
AI summary
Embodiments of the present invention provide a method for allocating and updating an identifier in order to protect the location privacy of a user equipment (UE), and apparatuses for supporting the same. As an embodiment of the present invention, a method for protecting the location privacy of a UE in a wireless access system may comprise the steps of: receiving, from a mobility management entity (MME), an access acceptance message including a globally unique temporary identifier (GUTI) assigned so as not to expose an IMSI of the UE and update period information indicating an update period of the GUTI; determining whether to update the GUTI on the basis of the update period information; transmitting a GUTI update request message to the MME when the update period indicated by the update period information is reached; and receiving a GUTI update message including a new updated GUTI, in response to the GUTI update request message.