Error%20Detection%20and%20Correction

1
Chapter 16 Wireless WANs Cellular Telephone
2
16-1 CELLULAR TELEPHONY
Cellular telephony is designed to provide
communications between two moving units, called
mobile stations (MSs), or between one mobile unit
and one stationary unit, often called a land
unit.
Topics discussed in this section
Frequency-Reuse PrincipleTransmitting Receiving R
oaming First Generation Second Generation Third
Generation
3
Cellular System

• A cellular service area is divided into cells.

4
Frequency Reuse Pattern
5
First Generation

• AMPS (Advanced Mobile Phone System) is an analog
  cellular phone system using FDMA
• operating in the ISM 800 Mhz

6
AMPS reverse communication band

7
Second-generation cellular phone systems
8
D-AMPS

• A second-generation cellular phone system that
  is a digital version of AMPS

• D-AMPS, or IS-136, is a digital cellular phone
  system using TDMA and FDMA.

• D-AMPS, or IS-136, is a digital cellular phone
  system using TDMA and FDMA.

9
GSM

• Global System for Mobile Communication (GSM) is
  a second-generation cellular phone system used in
  Europe
• bands

10
GSM (2)
11
IS-95

• Interim Standard 95 is a second-generation
  cellular phone system based on CDMA and DSSS
• IS-95 forward transmission

ESN electronic serial number
12
IS-95 reverse transmission

• IS-95 is a digital cellular phone system using
  CDMA/DSSS and FDMA.

13
PCS

• Using any second-generation Technology (GSM,
  IS-136, IS-95)
• Using 1900-Mhz. Higher freqs have a shorter
  range than lower ones (smaller cells)
• Providing SMS service Internet access

14
Third Generation

• The main goal of third-generation cellular
  telephony is to provide universal personal
  communication.
• Internet Mobile Communication for year 2000
  (IMT-2000)
• IMT-2000 radio interfaces

15
Questions !