Mobile networks
From Yate Documentation
A mobile network is composed by the following parts:
- Mobile Station (MS)
- The base stations subsystems (BSS)
- The network and switcing subsystem (NSS)
- The operations and support subsystem (OSS)
Mobile Station (MS):
- the mobile equipment (Ex: phone)
- the SIM (Subscriber identity Module) card that uniquely identified the card by the IMSI (International Mobile Subscriber Identity).
The base station subsystem (BSS):
- base station (BTS) - it defines a cell in the network
- base station controller (BSC) - controls a group of BTSs. Does handoffs, frequency hoppings, exchange functions and power control over each managed BTS
The network and switching subsystem(NSS)
- Home location register(HLR) - holds all subscribers in a network. Keeps subscriber specific information like MSISDN, IMSI, current location of the MS, roaming restrictions, additional features.
- AUC
- EIR
- Mobile switching center (MSC) - handles call routing, call setup, and basic switching functions. Does inter BSC handoffs and coordinates inter MSC handoffs
- GMSC
- Visitor location register (VLR) - is associated a local area(LA). Keeps information similar to the one in the HLR for the users in it's current local area
