電信行業(yè)-3G行動通訊與VoIP網(wǎng)際電話之企業(yè)應(yīng)用與發(fā)展

3G行動通訊與VoIP網(wǎng)際電話之企業(yè)應(yīng)用與發(fā)展ContentIntroduction

to

Telecommunications3G

Licenses

AuctionUMTS

WCDMAWireless

ApplicationsVoIP

&

its

ImplementationConclusionsCellular

Phone

Generations

1G:

AMPS

(Advanced

Mobile

PhoneSystem)

=>

analog

system

2G:

GSM

(Global

System

for

Mobilecommunication)

=>

digital

system

2.5G:

GPRS

(General

Packet

RadioSystem)

3G:

IMT-2000

(International

MobileTelecommunication

for

years

2000)Digital

Services

Vision032649.61443842,0001G2GVoiceText

Messaging3GStillAudioStreamingData

Transmission

Spee1d28-

k

bpsRemoteMedicalService(MedicaVideo

StreamingVideoConference(High

qualityl)image)Telephone(Voice)ElectronicNewspaperVoiceMailFax

E-MailElectronicPublishingImagingVideo

onDemand:Sports,

NewsWeatherKaraokeVideoConference(Lower

quality)JPEGStill

PhotosMobileRadioViideo

Surveillance,VideoMail,

TravelImageAudioVoice-driven

Web

PagesStreamingAudioDataWeather,

Traffic,

News,Sports,

Stock

updatesMobile

TVE-CommerceSource:

MotorolaMobile

Communication

EvolutionMobile

Phone

StandardsNetwork

evolution

convergence2G

to

3G

evolution3G執(zhí)照-歐洲資料臺灣3G執(zhí)照拍賣執(zhí)照Ａ：遠(yuǎn)致電信，101.69億元執(zhí)照B：聯(lián)邦電信，77億元執(zhí)照C：臺灣大哥大，102.81億元執(zhí)照D：中華電信，101.79億元執(zhí)照E：亞太行動寬頻，105.7億元總計(jì)：488.99億元臺灣3G執(zhí)照拍賣(續(xù))執(zhí)照Ａ：2

x

15MHz(1920~1935MHz;2110~2125MHz)+ 5MHz(1915~1920MHz)執(zhí)照B：2

x

10MHz(1935~1945MHz;2125~2135MHz)+ 5MHz(2021~2021MHz)執(zhí)照C：2

x

15MHz(1945~1960MHz;2135~2150MHz)+ 5MHz(2021~2021MHz)執(zhí)照D：2

x

15MHz(1960~1975MHz;2150~2165MHz)+ 5MHz(2021~2025MHz)執(zhí)照E：2

x

20MHz(825~845MHz;870~890MHz)3G拍賣趨勢3Q

20004Q

20001H2001UKSpainLiechtensteinJapanNetherlandsGermanyAustriaItalyPortugalSwedenFinland1Q

2000

2Q

20002H20016

x

WCDMA2

x

WCDMA1

x

CDMA20001

x

WCDMA4

x

WCDMA4

x

WCDMA5

x

WCDMA5

x

WCDMA4

x

WCDMA4

x

WCDMA4

x

WCDMA6

x

WCDMAS.

KoreaSwitzerlandNorway5

x

WCDMA2

x

WCDMA1

x

CDMA20005

x

WCDMAIrelandGreeceDenmarkFranceTaiwanHong

KongCzechBelgium3

x

WCDMA73

WCDMA

licences

awardedplus

more

to

come…

(120

by

end

2001Vs13

CDMA2000

networks

planned(out

of

which

2

already

opted

for

WCDMA)SingaporeAustraliaNew

Zealand4

x

WCDMA5

x

WCDMA4

x

WCDMAGPRS

Network115

kbps

using

8

time

slotsSGSN:

Serving

GPRS

SupportNode電路交換封包交換GPRS核心InternetGPRS骨幹IP網(wǎng)路BSCSGSNGGSNBTS網(wǎng)路開始有效時(shí)間:3Q

2000PSTNMSC3G

Network384

kbps

~

2

Mbps封包交換GPRS核心InternetGPRS骨幹IP網(wǎng)路電路交換PSTNMSCBSCSGSNGGSNBTSRNCBTSMobile

multimediastreamingPDA

handsetFDD:

frequency

division

duplex

Uplink

and

downlink

frequencies

aredifference

and

a

enough

frequencyspacing

must

be

exist.1805~1880

MHz1710~1785

MHzTDD:

time

division

duplex

Uplink

and

downlink

use

the

samefrequency,

but

transmit

signals

atdifferent

time.1895~1918

MHz1895~1918

MHzFDMA:

frequency

divisionmultiple

accessUsers

use

different

frequency

carriers200

kHz/channel

for

GSMChannel

#1Channel

#2TDMA:

time

division

multipleaccess

Each

carrier

can

contain

many

users,but

they

use

the

same

carrier

atdifferent

time

slots.channel

#1time

slot

#1channel

#1time

slot

#2TDMA/TDDT1T2T3T4R1R2R3R4PHS

from

JapanCarrier

spacing

is

300

kHzUplink

downlinktimeCchCchUser

1User

2User

3User

1User

2User

3TDMA/FDDT1T2T3T4T5T6T7T8R1R2R3R4R5R6R7R8GSMCarrier

spacing

is

200

kHzEach

carrier

contains

8

usersuplinkfrequencydownlinkfrequencyCDMA:

code

division

multipleaccessWireless

ApplicationsPerson-to-person

(communications)

servicesMobile

E-commerce

services:

video

1

and

2Travel/location

based

servicesRemote

diagnosticsTelemetry

servicesMobile

office

(business)

servicesEntertainment/leisure

services:

video

1

and

2Conclusions

3G

will

provide

wide

rangeof

voice

andnon-voice

service

including

circuit/packeswitching

and

multimedia

service.

It

is

possible

for

3G

to

create

newapplications

in

a

cost-effective

manner.

Mobile

and

the

Internet

will

be

the

majordemand

drivers

for

the

futureVoIP網(wǎng)際網(wǎng)路電VoIP網(wǎng)友評論:*最近很紅的一個(gè)對談軟體Skype(繁體中文語言包)用了P2P技術(shù),過防火牆後還是超級清楚,美東與臺灣連線時(shí)對方說話就像坐在正對面一樣,讓我徹底對網(wǎng)路語音軟體改觀,想想以前用yahoo

messenger或MSN那種模糊延遲的語音真是好笑.然

後因?yàn)樗赓M(fèi)又太清楚,介紹親友後我已經(jīng)很久沒花錢打國際電話了.*清晰度一級棒，即時(shí)通和MSN根本無法比啊！?且即時(shí)通