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Alcatel Shanghai Bell's virtual HLR (VHLR) able to manage their own local operators to provide mobile users a flexible way, but there are access restrictions, thereby replacing the original HLR centralized control.
Performance:
virtual HLR system can use the client-server approach to achieve. As the S12 switches provide Ethernet interface EPMOM module also supports the Telnet protocol, it can be input and output of the MMC for remote operation, including complete control of the MSC, HLR.
the virtual HLR system consists of two parts: the network connectivity and services.
virtual HLR services provided include handles all preliminary tasks, such as customer authentication level, enter the requested semantic grammar checking, the input request queue sorting, establishment of mobile users, such as partition table.
From a logical point of view server virtual HLR HLR according to the user management perspective will be split into different sections, according to MIN / IMSI range, users are assigned to different virtual HLR. Different MIN / IMSI is assigned a range of user groups, user group name and password.
Advantages:
virtual HLR for each partition can be independently access and management (such as users create, edit, delete), and independently of each other
can operate the remote input and output of the MMC
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