25-10-2012, 04:04 PM
Basic Concepts of Cellular Networks and Mobile IP
Basic Concepts of Cellular Networks and Mobile IP.ppt (Size: 617 KB / Downloads: 77)
Origin of Wireless Communications
Wireless communications gained popularity in 1930’s
Mainly used for public safety by police and other government organizations
Not connected to the PSTN (Public Switching Telephone Networks)
First public mobile telephone service started in 1946 in United States
Using a single high power transmitter and large tower to cover an area of 50 km
2G Systems
Goal: Digital voice service with improved quality and also provide better data services
Time Frame: 1990- 2000
Technology: TDMA/TDD, CDMA
Example Systems:
Global System for Mobile (GSM-Europe)
IS-136(TDMA)
IS-95 (CDMA)
4G Systems
Future systems
Goal:
High mobility, High data rate, IP based network
Hybrid network that can interoperate with other networks
AMPS: Conventional Telephone Cell Phone
Call arrives at MSC via the PSTN
MSC then sends out a paging message via all BTS on the FCC (Forward Control Channel).
The paging message contains subscriber’s Mobile Identification Number (MIN)
The mobile unit responds with an acknowledgement on the RCC (Reverse Control Channel)
MSC directs BS to assign FVC (Forward Voice Channel) and RVC (Reverse Voice Channel)