01Intro 이통2014봄.ppt [호환 모드]contents.kocw.net/KOCW/document/2014/Yeungnam/... · 2016. 9. 9. · • Location update by menLocation update by men Paging Control Ct PSTN

Introduction

INTRODUCTION

Mobile Communications Engineering, Spring 2014 Jae Kyun Kwon, Yeungnam Univ.

Introduction

WIRELESS COMMUNICATIONS SYSTEMSWIRELESS COMMUNICATIONS SYSTEMS

Femtocell

Mobile Communications Engineering, Spring 2014 Jae Kyun Kwon, Yeungnam Univ.2

Introduction

FOUR LAYERS WIRELESS COMMUNICATIONSFOUR LAYERS WIRELESS COMMUNICATIONS

L 1 Gl b l C ll l CLayer 1 – Global Cellular Comm.

PUBLIC AREA

WLAN

Layer 2 – Global Wireless LAN

ENTERPRISE HOME

WLAN

Layer 3 – Global Wireless PAN

Layer 4 – Global Wireless BAN


Introduction

EXAMPLES OF WIRELESS COM SYSTEMSEXAMPLES OF WIRELESS COM. SYSTEMS

• Paging System• Cordless Telephone SystemCordless Telephone System• Cellular System• Satellite System• Wireless LAN• Wireless LAN• Wireless PAN/BAN


Introduction

PAGER (beeper)PAGER (beeper)


Introduction

PAGING SYSTEMPAGING SYSTEM

• Sending brief messages such as numeric, alphanumeric, and voice. (news headlines, p , ( ,stock info., and fax in modern systems)

• Location update by men• Location update by men

Paging ControlC tPSTN CenterPSTN


Introduction

국내 PAGING 서비스 (012 015)국내 PAGING 서비스 (012,015)1980년대 도입• 1980년대 도입

• 사업자초기 : SK 텔레콤 서울이동통신 나래이동통신 해피텔– 초기 : SK 텔레콤, 서울이동통신, 나래이동통신, 해피텔레콤

– 2009년 : 리얼텔레콤 사업 중단– 서울이동통신만 남음

• 사용자– 전성기 : 1997년 1519만명 2000년 45만명 1~2만명– 얼마 전 : 병원, 군인, 특수직 종사자

양방향 M2M으로 발전– 양방향, M2M으로 발전


Introduction

CORDLESS TELEPHONE SYSTEMCORDLESS TELEPHONE SYSTEM

• Full duplex• Connect a portable handset to a fixed port with a specific

t l h b PSTNtelephone number on PSTN• 1st generation (1980s) : over distances of a few tens of meters

2 d i i d l i• 2nd generation : extension to outdoor locations • Combined with paging receivers• Limited range and mobility

PSTN Fixed Port


Introduction

CT2 (시티폰)CT2 (시티폰)


Introduction

CELLULAR SYSTEMCELLULAR SYSTEM

• Simplified cellular system All-IP

T1 leased lines,microwave link, or

PSTN MTSO Cell site

c ow ve , ooptical fiber

=MSC

PSTN: Public Switched Telephone NetworkMTSO: Mobile Telephone Switching OfficeMSC: Mobile Switching Center


g

Introduction

SATELLITE SYSTEMSATELLITE SYSTEM

• Cover very large areas• Different orbit heights

– GEO: geostationary orbit, 36000 km above earth surfaceg y– LEO (Low Earth Orbit): 500 - 1500 km– MEO, ICO, HEO

• Optimized for one-way transmissionp y– Broadcasting: radio, DMB

• Most two-way systems struggling or bankrupt (Iridium)– Expensive alternative to terrestrial system


Introduction

WIRELESS LANWIRELESS LAN

01011011

InternetAccess

0101 1011

AccessPoint

• WLANs connect “local” computers (100m range)• WLANs connect local computers (100m range)• Breaks data into packets• Channel access is shared (random access)( )• Backbone Internet provides best-effort service


Introduction

WIRELESS LAN (cont’d)WIRELESS LAN (cont d)802 11b• 802.11b– Established in 1999.– 2.4 GHz, 11 Mbps– DSSS

• 802.11a3 diff t b d d 5 GH ( i d t hi h f )– 3 different bands around 5 GHz. (more power required at higher freq.)

– 54 Mbps– OFDM– Similar to HiperLAN in Europe

• 802.11g– To extend 11b’s 2.4 GHz band into 11a’s bandwidth capabilities o e e d b s . G b d o s b dw d c p b es– OFDM – Speeds up to 54 Mbps


Introduction

WIRELESS LAN (cont’d)WIRELESS LAN (cont d)

• 802.11n– Higher throughput, MIMO and OFDM

• 802.11ac– Higher throughput, MU-MIMO and OFDMg g p ,


Introduction

WIRELESS PANWIRELESS PAN

• Wireless personal area network– Bluetooth– RFID

ZigBee– ZigBee


Introduction

BLUETOOTHBLUETOOTH

• A new global standard for data and voice• Interconnecting computer and peripherals, handheld g p p p

devices, PDAs, cell phones – replacement of IrDA • Short range (10 m), low power consumption, license-Short range (10 m), low power consumption, license

free 2.4GHz ISM band • Developed by Ericsson in 1994• Developed by Ericsson in 1994

– Bluetooth (King of Denmark in the 10th century)


Introduction

BLUETOOTH APPLICATIONSBLUETOOTH APPLICATIONS

• Headset• Keyboard/MouseKeyboard/Mouse• GPS• etc.


Introduction

WBANWBAN• Wearable Computing

Environmentdisplayp y

context sensor array: camera, light,

microphone,GPScommunication:

WLAN, 3G/4G

distributed reconfigurable computer

,

computerbody area network:wireless


Introduction

MOBILE COM SYSTEMSMOBILE COM. SYSTEMSt i• 1st Generation

– AMPS (USA): analog, FDMA– CT1

• 2G2G– GSM (Europe and worldwide): digital, TDMA

IS 95 (Qualcomm Korea): digital CDMA– IS-95 (Qualcomm, Korea): digital, CDMA– IS-136, PDC, etc.

2 5G• 2.5G– cdma2000 1x (2.5G or 3G)


Introduction

MOBILE COM SYSTEMSMOBILE COM. SYSTEMS3G• 3G– 1xEVDO (3GPP2: Qualcomm): CDMA, fast data (3G or 3.5G)

– WCDMA (3GPP: Europe Japan etc ): CDMAWCDMA (3GPP: Europe, Japan, etc.): CDMA• 3.5G

– HSDPA (3GPP): CDMA, fast data( ) ,– WiBro (IEEE 802.16e): OFDM, fast data

• 3.9G– LTE (3GPP): OFDM, MIMO

• 4GLTE Ad d (3GPP) OFDM MIMO l h– LTE-Advanced (3GPP): OFDM, MIMO + alpha

– IEEE 802.16m (IEEE): OFDM, MIMO + alpha


Introduction

STANDARDIZATIONSTANDARDIZATION


Documents

01Intro 이통2014봄.ppt [호환 모드]contents.kocw.net/KOCW/document/2014/Yeungnam/... · 2016. 9. 9. · • Location update by menLocation update by men Paging Control Ct PSTN