A small network operator can only appoint one Mobile Switching Center, whereas a large operator requires many MSCs. MSC plays an important role in the handover, especially the handover covering many base station controllers – known as Inter-BSC or Intra-MSC handover – as well as many MSCs, which include Inter -MSC is known as handover.
In an inter-BSc handover and after detecting that a mobile device is reaching the edge of its cell, the BSc requests handover support from its MSc. MSC then scans a list of adjacent cells and their respective BSCs and facilitates handover to proper BSC.
As mobile phones are run, it is important for the MSC to determine the location of each phone in order to effectively determine routing communication between them.
For this purpose, Mobile Switching Center works with a large database known as Home Location Register (HLR), which stores relevant location and other information for each mobile phone.
Because reaching HLR uses many network resources, most operators employ the Visitor Location Register (VLR). These are relatively small databases, which are integrated with the MSc. Some carriers deploy a VLR per MSL, while others set up a VLR for the service of many
Mobile Switching Center.
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