1 kommunikatsiooniteenuste arendus irt0080 loeng 3 avo ots telekommunikatsiooni õppetool, ttÜ...

1

Kommunikatsiooniteenuste arendusIRT0080Loeng 3

Avo Otstelekommunikatsiooni õppetool,

TTÜ raadio- ja sidetehnika inst.avo.ots@ttu.ee

2

Capacity Units

1995 2000 2005 2010

•Gflops•Gbytes

•Tflops•Pbytes

•Pflops•Ebytes

10e06

10e09

10e15

10e12

MbpsBackbone

GbpsBackbone

TbpsBackbone

10% BsBW

e2e Tbpsthroughput

e2e Gbpsthroughput

e2e kbpsthroughput

10%BsBW

10% BsBW

Terascale Computing

Gigascale Computing

Petascale Computing

Arvuti- ja kommunikatsioonijõudlus

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Võrgukihi kommutaator

PBX Transformation

PBX

Telephony Server

Efficiency & quality

Packet Packet size size Codec Codec

Efficiency Efficiency of transport of transport Voice quality Voice quality

Dejittering Dejittering delay delay

Echo Echo control control

Header Header compression compression

6

Kõne pakettvõrgus• Kõnesignaali komprimeeriv koodek

(ITU-T G.729A, 8 kbit/s)• VAD (Voice Activity Detection), Silence Suppression ,

Comfort Noise Generation

• Töödeldava lugemikogumi pikkus: 20 ms, => Payload 20 octets

Ethernet+FCS+Preamble: 26 bytes802.1q VLAN Tagging 4 bytesIP: 20 bytesUDP: 8 bytes RTP: 12 bytes Voice Payload: 20 bytes

----------90 bytes

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Paketiülekande hinnangud

CodecType

Sample Size[ms]

Payload[octets]

Ethernet Packet

Size[octets]

Ethernet Load w/o Preamble

[kBit/s]

Overhead / Payload

ratio

G.711 30 240 310 82,7 24%G.711 60 480 550 73,3 12%

G.729A 20 20 90 36,0 290%G.729A 40 40 110 22,0 145%G.729A 60 60 130 17,3 97%

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DNS-B(0.5.8.9.1.9.1.e164.arpa)

DNS-A(9.1.9.1.e164.arpa)

ENUM

proxy.comINVITE

INVITE

Answer = sip:n

iel@pro

xy.com

“(919) 850-5500"

Qu

ery

0.0.

5.5.

0.5.

8.9.

1.9.

1.e1

64.a

rpa

Au

tho

rity

= D

NS

-B

Query 0.0.5.5.0.5.8.9.1.9.1.e164.arp

a

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Application Data loss Bandwidth Time sensitive

Application layer protocol

Transport protocol

File transfer No Elastic No FTP TCP

E-mail No Elastic No SMTP TCP

Web documents

No Elastic, Kbps No HTTP TCP

Real-time audio/video

Yes Kbps, Mbps Yes, 100s of Msec

Proprietary TCP or UDP

Stored audio/video

Yes Kbps, Mbps Yes, sec Proprietary, NFS

TCP or UDP

Interactive games

Yes Kbps Yes, 100s of Msec

Proprietary TCP or UDP

Financial applications

No Elastic Both Proprietary TCP

TCP: guarantee: deliver all data; no guarantee: rate, delay; connection; congestion controlUDP: no guarantee: deliver all data, order, delay; no connection; no congestion control

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Areng

cdmaOne

GSM

TDMA

PDC

2G

9.6 - 14.4 kbps

MC1X

GPRS

evolved 2G

64–144 kbps

WLAN

Bluetooth

evolved 3G384 kbps - 20 Mbps

Always Best Connected

EDGE

WCDMA

cdma2000

3G384 kbps - 2 Mbps

4G100 Mbps?

xMbps @ 60 GHz

Ad hoc networks

Optical Networking

New air-interface?

Virtual Reality

Always Best Connected

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Mobiilsus

High-endDatacom users

Mob

ilit

y

Processing capacityUser interface, e.g. screen-size

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Connectivity

In the carIn the office

Stationary Wi-Fi

Portable Wi-Fi &

WiMAX

On campus

Portable Wi-Fi & WiMAX

& Cellular

TODAYIn the cityHome or school

Seamless roaming among wireless networks

Portable Wi-Fi &

WiMAX

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Network paradigm shift

Current Future

In a converged network, services will no longer be tied to a one type of network. Instead, the converged network will deliver all services.

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Mobiilsus

base station

home agent

Internet w/ Mobile IP

mobile

mobile access network