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CDMA - Architecture
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BTS: Base Transceiver Station

BSC: Base Station Controller

MSC: Mobile Switching Center

DMH: Data Message Handler

OMC: Operation Maintenance center

LWF: Interworking Function

HLR: Home Location Register

VLR: Visitor Location Register

AUC: Authentication Center

ELR: Equipment Identity Register

Other than radio interface the remaining network is similar to GSM

MS: Mobile unit with user

BSS: Manages radio interface b/w mobile stations and MSC consists of BTS and BSC.

MSC: Central unit equivalent to telephone exchange in a fixed network.

Functions:

  1. Anchor MSC: Radio contact
  2. Border MSC: Control BTS adjacent to location of mobile station
  3. HLR: maintains all subscriber related info and is responsible for managing mobile subscribers. Multiple MSCs are served by HLR
  4. DMH: collecting billing data
  5. VLR: linked to one or more MSCs. Dynamically stores subscriber information obtained from subscribers HLR data. During roaming MS enters a new service area covered by MSC. MSC informs associated VLR about the MS querying the HLR after MS goes through a registration process.
  6. AUC: manages Authentication

  7. ELR: Provides information about mobile device for record purposes

  8. OMC: overall management of wireless network

  9. LWF: enables msc to communicate with other networks.

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