MSC association in 4G Network
MSC association in the 4G Network refers to the association between the MME (Mobility Management Entity) in 4G network and the MSC (Mobile Switching Center).
The MSC exists in the 2G/3G Circuit-switched (CS) core network. And it is the node that is responsible for handling the voice calls and the CS services.
When the UE camps in the 4G Network, and the UE needs to initiate or receive a voice call, it may need to "fallback" to the 2G/3G network. So that the UE can use the CS services.
In this case, the MSC association is used. So that the UE temporarily fallback to 2G/3G network, and connects with the MSC that is associated with the MME. This occurs in order for the UE to initiate or receive the voice call.
And then after the UE finishes the voice call, it can "re-attaches" again to the 4G network.
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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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Gr interface and Gs interface
The Gr interface exists between the SGSN and the HLR. While the Gs interface exists between the SGSN and the MSC/VLR. Both of those interfaces are based on the 'SS7' protocol. Those interfaces doesn’t pass user plane data. They only pass signaling messages. Therefore, those interfaces are having only control plane. There is no user…
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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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