Download Teenus_3

Kommunikatsiooniteenuste
arendus
IRT0080
Loeng 3
Avo Ots
telekommunikatsiooni õppetool,
TTÜ raadio- ja sidetehnika inst.
[email protected]
1
Arvuti- ja kommunikatsioonijõudlus
Petascale
Computing
Capacity Units
10e15
Terascale
Computing
10% BsBW
10e12
Gigascale
Computing
10%BsBW
10e09
10% BsBW
Tbps
Backbone
Gbps
Backbone
10e06
Mbps
Backbone
1995
2000
2005
2010
2
Võrgukihi kommutaator
3
PBX Transformation
PBX
Telephony
Server
Efficiency & quality
Echo
control
Dejittering
delay
Voice quality
Packet
size
Codec
Efficiency of transport
Header
compression
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:
802.1q VLAN Tagging
IP:
UDP:
RTP:
Voice Payload:
26 bytes
4 bytes
20 bytes
8 bytes
12 bytes
20 bytes
----------
90 bytes
6
Paketiülekande hinnangud
Codec
Type
Sample
Size
[ms]
G.711
G.711
G.729A
G.729A
G.729A
30
60
20
40
60
Ethernet
Payload Packet
[octets]
Size
[octets]
240
480
20
40
60
310
550
90
110
130
Ethernet
Overhead /
Load w/o
Payload
Preamble
ratio
[kBit/s]
82,7
73,3
36,0
22,0
17,3
24%
12%
290%
145%
97%
7
ENUM
DNS-A
(9.1.9.1.e164.arpa)
DNS-B
(0.5.8.9.1.9.1.e164.arpa)
proxy.com
INVITE
INVITE
“(919) 850-5500"
8
Application
Data loss
Bandwidth
Time
sensitive
Application
Transport
layer protocol 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 control
UDP: no guarantee: deliver all data, order, delay; no connection; no congestion control
9
Areng
Virtual
Reality
WLAN
xMbps @
60 GHz
Ad hoc
networks
EDGE
TDMA
GSM
Always Best
Always Best
ConnectedConnected
GPRS
WCDMA
PDC
cdmaOne
2G
9.6 - 14.4 kbps
New airinterface?
MC1X
cdma2000
Bluetooth
evolved 2G
3G
evolved 3G
64–144 kbps
384 kbps - 2 Mbps
384 kbps - 20 Mbps
Optical
Networking
4G
100 Mbps?
10
Mobility
Mobiilsus
High-end
Datacom users
Processing capacity
User interface, e.g. screen-size
11
Connectivity
In the office
On campus
Stationary
Portable
 Wi-Fi
 Wi-Fi &
WiMAX
Home or school TODAY
In the city
Portable
Portable
 Wi-Fi &
WiMAX
 Wi-Fi & WiMAX
& Cellular
Seamless roaming among wireless networks
In the car
12
Network paradigm shift
In a converged network, services will no longer be tied to a
one type of network. Instead, the converged network will
deliver all services.
Current
Future
13
Mobiilsus
home agent
Internet w/ Mobile IP
mobile
access
network
base station
mobile
14