Mobile Station (MS)

Mobile Station (MS):

The Mobile Station (MS) communicates with the Base Transceiver Stations (BTSs) over the radio interface.

Mobile Station (MS)

Base Transceiver Station (BTS):

It is the official name of the cell site. The Base Transceiver Station is responsible for allocating resources and both power and Walsh codes for consumption by subscribers with a 1xRTT system and time slots and modulation format for 1xEV-DO.

BTS has a physical radio equipment that is used for transmitting and receiving the CDMA 2000 signals. 

BTS controls the interface between the CDMA 2000 network and the subscriber unit.

The BTS also controls many features of the system that are to the performance of the network. The features that BTS controls are directly related multiple carriers that operate from the site, forward power and assignment of Walsh codes.

Base Station Controller (BSC):

Each BSC controls upto several hundred BTSs. The BSC is responsible for controlling all the BTSs under its domain.

The BSC routes packets to and from the BTSs to the PDSN. 

The BSC also routes Time Division Multiplexing (TDM) traffic to the circuit-switched platforms. It routes the packet data to the PDSN.

Mobile Switching Center:

The MSC is the central unit and controls the traffic among all of the BSCs. There are databases called HLR (Home Location Register) and Visitor Location Register (VLR).

The HLR is a database that contains subscriber information and location information for each user who resides in the same city as the MSC

The VLR is a database that stores the customer information for each roaming subscriber who is visiting the coverage area of a specific MSC.

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