These descriptions is all about BS, which one is correct ( )?
A. BS is the component of the wire network access infrastructure.
BS terminates the air interface over which the subscriber traffic is transmitted to and from a mobile station.
C. BS is called a Base Transceiver Station.
D. A, B and C
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Which one is incorrect about HLR ( )?
A. The HLR is a database that contains information about subscribers to a mobile network.
B. the HLR might contain the service profiles of visiting subscribers.
C. The HLR uses the subscriber information supplied by the itself to authenticate and register the subscriber.
D. The HLR stores “permanent” subscriber information, including the service profile, location information, etc.
Which one is incorrect about VLR ( )?
A. The VLR is a database that is maintained by an MSC.
B. VLR store temporary information about all subscribers.
C. VLR communicates with the HLR of the roaming subscriber to request data.
D. VLR maintain information about the subscriber’s current location in the network
Back to the Figure 1 IP Integration Phases in Mobile Wireless, which statement on the below is incorrect ( )?
A. The first phase of these infrastructures based on circuit-switched voice and data services.
B. The second quadrant depicts the implementation phase of 3G technologies.
C. In the third phase, voice and data are consolidated onto a packet-based infrastructure from the RAN or radio network control (RNC) outward.
D. The fourth phase includes 3G services plus the implementation of IP-based radio and mobility components to develop a true end-to-end, all-IP wireless network solution.
Which standards of the “G” treat reliability factor as the hardest obstacle ( ) ?
A. 1G
B. 2G
C. 3G
D. 4G
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