From the course: NB-IoT (Narrowband IoT) Engineering: Deployment, Configuration, Call Flow Analysis
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The primary user identity: GUTI
From the course: NB-IoT (Narrowband IoT) Engineering: Deployment, Configuration, Call Flow Analysis
The primary user identity: GUTI
We talked about the International Mobile Subscriber Identity, which is IMSI, which helps to have a communication between the device and the network. Now, IMSI is a permanent ID and it cannot be used every time for the communication because it poses privacy and security risk. In that case, we have a new term, which is GUTI, which is Globally Unique Temporary Identity. Now, this is used to protect the user's permanent identity, which is Emsi. We talked about the Emsi in detail. The TIMSI is used to encapsulate the Emsi, but for the initial attach and authentication purpose only. What about the continuous communication after that? So Guti comes into picture in that case. It enhances the user privacy and supports efficient paging. Now there are different components of Guti. It is heavily focused on the MME group IDs and MME code. We have the different MMEs where we have different groups. And specific MME would be then representing a particular user. We also have the TIMSY, which we know…
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