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Sidevõrgud IRT 0020 loeng 5 27. sept. 2005. Avo Ots telekommunikatsiooni õppetool, TTÜ raadio- ja sidetehnika inst. avo.ots@ttu.ee. WiMAX. Large Coverage. Network Simplicity. WiFi. 3G. Full Mobility. QoS. Technology &Services. Erivajadused Avatud keskkond Juhtmevaba.
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SidevõrgudIRT 0020loeng 5 27. sept. 2005 Avo Otstelekommunikatsiooni õppetool, TTÜ raadio- ja sidetehnika inst.avo.ots@ttu.ee
WiMAX Large Coverage Network Simplicity WiFi 3G Full Mobility QoS Technology &Services
Erivajadused Avatud keskkond Juhtmevaba Võrgukasutus • Kasutus • Trust • Security • Efficiency
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
Channels broadcast to all UE in the cell 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) Paging Channels S-CCPCH - Secondary Common Control Physical Channel PICH - Page Indication Channel Random Access and Packet Access Channels PRACH - Physical Random Access Channel AICH - Acquisition Indication Channel PCPCH - Common Physical Packet Channel AP-AICH - Acquisition Preamble Indication Channel CD/CA-AICH - Collision Detection Indication Channel CSICH - CPCH Status Indication Channel Dedicated Connection Channels DPDCH - Dedicated Physical Data Channel DPCCH - Dedicated Physical Control Channel F-PDSCH - Physical Downlink Shared Channel WCDMA kanalid
Channel Sharing Techniques Static Channelization Channel Sharing Techniques Scheduling Dynamic Medium Access Control Random Access
Classification of Multiple Access Protocols Multiple access protocols Contention-based Conflict-free Collision resolution Random access TREE, WINDOW, etc ALOHA, CSMA, BTMA, ISMA, etc FDMA, TDMA, CDMA, Token Bus, DQDB, etc BTMA: Busy Tone Multiple Access ISMA: Internet Streaming Media Alliance DQDB: Distributed Queue Dual Bus
Throughput 0.368 Slotted Aloha S 0.184 Aloha G