31-03-2012, 11:40 AM
GSM Fundamental
gsm-fundamental-uku (1).ppt (Size: 1.64 MB / Downloads: 135)
Base Transceiver Station (BTS)
Wireless transmission
Wireless diversity
Wireless channel encryption
Conversion between wired and wireless signals
Frequency Hopping
Managing Wireless network-BSS Monitoring BTS
Controls:
Wireless link distribution between MS and BTS
Communication connection and disconnection
MS location, handover and paging
Voice encoding, transecoding (TC), rate, adaptation,
The operation and maintenance functions of BSS.
Mobile Service Switching Center
holds all the switching functions
manages the necessary radio resources,
updating the location registration
carrying out the inter-BSC and inter-MSC tender
Inter-working with other networks (IWF).
Numbering Arrangement
To insure the IMSI security, the VLR will assign an unique TMSI number for the accessed subscriber. It is used locally only and is a 4-byte TMSI number BCD code.