system architecture 2018 fall intro lte (1)wada/system17/system architecture chap1-2.… · system...
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System Architecture
2018 Fall
Intro LTE (Chap1 and
part of Chap2)
Tomohisa Wada
Information Engineering
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Previous LTE : two different radio waves
UMTS:Universal Mobile Communication System
GSM:Global System for Mobile Communications
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Circuit Switch
Public Switch
Telephone
Network
Voice Call
Packet Switch
Web Email
Packet Data
Network
Constant Data Rate
& Minimum DelayGSM EDGE
radio access
network
UMTS
terrestrial
radio access
network
User Equipment
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Detail of Air Interface (UMTS)
FDD: frequency division duplex
TDD: time division duplex
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cell
celll
cellRadio Network Controller
1) Pass voice and packet amaong Node Bs
and Core network
2) Controll mobiles by signals
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Review of OSI model
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TRANSPORT LAYER
TCP(transmission control protocol):
does re-transmit.
Web, email etc.
UDP(user datagram protocol): no re-
transmit
Real time voice and video
NETWORK LAYER
IP(internet protocol): send packet
using IP address.
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LTE is much simple : data main
No circuit switch in LTE
IP multimedia subsystem (IMS)
supports voice over IP call.
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Evolved Packet Core
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Key features of air interface
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Key features
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Number of all subscriptions
8
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LTE subscriptions
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3GPP specs
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FDD
frequency
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TDD
frequency
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Freq used by LTE (2013)
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