Mobile Networks
3 important questions on Mobile Networks
4 different cell sizes in a GSM networK
- Macro (<= 10 KM) rural areas or along highways
- Micro (<= 2 KM) mail, hotel, transportation hub
- Pico (<= 200 M) in-building, in-aircraft
- Femto (<= 10 M) home or small business
3 ways to divide radio spectrum:
- Frequency Division Multiple Access (FMDA)
- Frequency Division Duplex (FDD)
- Time Division Multiple Access (TDMA)
Global System for Mobile Communication (GSM):
- Base Station Contriller (BSC): controls many cells, register subscribers, handlers handovers
- Visitor Location Register (VLR): a database that stores temporary data regarding subscribers needed by the MSC
- Home Location Register (HLR): holds information about the service profile, status of activity, information about locations, etc.
- Mobile Service Switching Center (MSC): controls the calls from from and to other telephones. Authentication, equipment identity.
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