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Kommunikatsiooniteenuste arendusIRT0080Loeng 3
Avo Otstelekommunikatsiooni õppetool,
TTÜ raadio- ja sidetehnika [email protected]
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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
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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
