1 Kyung Hee University Chapter 16 Wireless WANs: Cellular Telephone

2 Kyung Hee University 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. Frequency-Reuse Principle Transmitting Receiving Roaming First Generation Second Generation Third Generation Topics discussed in this section:

3 Kyung Hee University Cellular System  A cellular service area is divided into cells.

4 Kyung Hee University Frequency Reuse Pattern

5 Kyung Hee University First Generation  AMPS (Advanced Mobile Phone System) is an analog cellular phone system using FDMA  operating in the ISM 800 Mhz

6 Kyung Hee University AMPS reverse communication band

7 Kyung Hee University Second-generation cellular phone systems

8 Kyung Hee University D-AMPS  D-AMPS, or IS-136, is a digital cellular phone system using TDMA and FDMA.  A second-generation cellular phone system that is a digital version of AMPS

9 Kyung Hee University GSM  Global System for Mobile Communication (GSM) is a second-generation cellular phone system used in Europe  bands

10 Kyung Hee University GSM (2)

11 Kyung Hee University 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 Kyung Hee University IS-95 reverse transmission  IS-95 is a digital cellular phone system using CDMA/DSSS and FDMA.

13 Kyung Hee University 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 Kyung Hee University 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 Kyung Hee University Questions !