VLR (Visitor Location Register) in Mobile Networks
VLR (Visitor Location Register), is a key component in the 2G/3G mobile circuit-switched (CS) network architecture. It coexists with the MSC server.
It is responsible for maintaining and managing information about mobile subscribers who are temporarily located within the coverage area of a specific MSC server.
When a mobile subscriber roams into a new geographical area, their device registers with the local VLR. So that it stores the subscriber's current location information. Then it tracks the subscriber's location within its own service area, enabling efficient call routing and delivery of services.
The VLR communicates with the HLR to obtain subscriber information, and to inform the HLR that it currently serves this subscriber.
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LTE (4G) Network Architecture
LTE (4G) Network Nodes LTE refers to 'Long Term Evolution', and the architecture of the LTE (4G) network is as following, eNodeB The eNodeB is the 4G site that the UE connects to. It provides the radio interface to the UE. MME MME refers to 'Mobility Management Entity'. The MME is responsible for authenticating the…
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Combined Attach procedure in GPRS
'Combined Attach' means the MS is making an attach to the CS and PS domains in the same time. And this will save the radio resources of the network. This will be available if the Gs interface exists between the CS domain and the PS domain. In addition, the MS should support working in both…
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Gs interface – SGSN/MSC association in GPRS
The Gs interface is the interface between the SGSN, and the MSC/VLR. In other words, it is the interface between the PS domain and the CS domain. When you switch the MS on, it makes an attach to the CS domain, and this is the 'IMSI attach'. when you enable data on the MS, it…
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SGSN, GGSN – 2G/3G Network Architecture and Interfaces
2G/3G Network Nodes The following graph shows the 2G/3G Network Architecture. It includes the SGSN, GGSN, HLR, CG, PDN, RNC, and BSC. SGSN GGSN, HLR, CG, PDN, RNC, BSC, 2G/3G Network Interfaces Now we know the nodes that exist in the 2G/3G network. Let's learn the interface names that exist between those nodes. Every interface…
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