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Sidevõrgud IRT 0020 loeng 5 27. sept. 2005. Avo Ots telekommunikatsiooni õppetool, TTÜ raadio- ja sidetehnika inst. [email protected]. WiMAX. Large Coverage. Network Simplicity. WiFi. 3G. Full Mobility. QoS. Technology &Services. Erivajadused Avatud keskkond Juhtmevaba. - PowerPoint PPT Presentation
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SidevõrgudIRT 0020
loeng 5 27. sept. 2005
Avo Otstelekommunikatsiooni õppetool,
TTÜ raadio- ja sidetehnika [email protected]
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Technology &Services
3G
WiMAX
WiFiNetworkSimplicity
LargeCoverage
QoSFull Mobility
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Võrgukasutus
• Erivajadused • Avatud keskkond• Juhtmevaba
Trust
SecurityEfficiency
• Kasutus Trust Security Efficiency
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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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WCDMA kanalid
BaseStation
(BS)
UserEquipment
(UE)
P-CCPCH- Primary Common Control Physical ChannelSCH - Sync Channel
P-CPICH - Primary Common Pilot ChannelS-CPICH - Secondary Common Pilot Channel(s)
Channels broadcast to all UE in the cell
DPDCH - Dedicated Physical Data Channel
DPCCH - Dedicated Physical Control Channel
F-PDSCH - Physical Downlink Shared Channel
Dedicated Connection Channels
PICH - Page Indication Channel
Paging Channels
S-CCPCH - Secondary Common Control Physical Channel
PCPCH - Common Physical Packet Channel
AP-AICH - Acquisition Preamble Indication Channel
CD/CA-AICH - Collision Detection Indication Channel
CSICH - CPCH Status Indication Channel
PRACH - Physical Random Access Channel
AICH - Acquisition Indication Channel
Random Access and Packet Access Channels
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Channel Sharing Techniques
Channel Sharing Techniques
Static Channelization
Dynamic Medium Access Control
Scheduling
Random Access
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Classification of Multiple Access Protocols
Multiple access protocols
Contention-based Conflict-free
Random access Collision resolution
FDMA,
TDMA,
CDMA,
Token Bus,
DQDB, etc
ALOHA,
CSMA,
BTMA,
ISMA, etc
TREE,
WINDOW, etc
DQDB: Distributed Queue Dual Bus
BTMA: Busy Tone Multiple AccessISMA: Internet Streaming Media Alliance
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Throughput
G86420
0.5
0.4
0.3
0.2
0.1
0
Slotted Aloha
Aloha
0.368
0.184
G
S
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http://www.isi.edu/nsnam/ns/
