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Copy of 3G Technology

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by

Roger Ricardo Pizarro Kikuchi

on 16 November 2013

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Transcript of Copy of 3G Technology


RLC sublayer (establishment, release...)
Net layer ( Call control)
MAC sublayer (physical access)
3G
TECHNOLOGY

Applications
Thank you for your attention
What |s 3G ?
Physical layer
Data link level
UMTS
In Europe
IMT-2000 Standard
Speeds :
(Universal Mobile Telecommunication System)
144 kbit/s in high speed movements
384 kbits/s in outdoor areas
7.2 Mbit/s inside the buildings
Download
Upload
128 Kbit/s
Types of services :
The conversational class
The streaming class
The interactive class
The background class
Video-conferencing
Real time video
Web browsing
Email
Advantages
Roaming
World level coverage
Security
The UMTS networks
The air interface
used by UTRAN.
WCDMA
(Wideband Code Division Multiple Access)
Ways of operation :
TDD (Time Divison Duplex)
FDD (Frequency Division Duplex)
Layers UTRAN networks :
Physical layer
Data Link layer
MAC sublayer (Media Access Control)
RLC sublayer (Radio Link Control)
BMC
PDCP
Network layer
RRC and others
Transmission medium
Modulation:
Developed by 3GPP
Third Generation Partnership Project
1
2
3
4
5
6
7
8
-Band pass (spreading)
-Unique extended codes:
10 ms, 15 time slot
Signal
transmission
reception
TPC
(Transmit power control)





Out-loop control Calculates S/N
Closed loop control:
In-loop control Adjusts power
(UTRAN)
low level of noise
band pass filter
FBI: Feedback information comands

TFCI: Transport format combination indicator
Advantages:
Security
Interception resistance
Multipath fading resistance
Multiple access techniques
Error control
Convolutional codes
Turbo codes
No fec at all
Physicall layer
Redudancy bits
CRC
Spreading process:
Channeling
Scrambling
COORDINATING THE COMUNICATION
Frame
Extension codes:
Orthogonal codes
Pseudo noise codes
9
10
11
12
13
FLOW CONTROL
MAC sublayer
RRC sublayer
Decide
Modulation scheme in UTRAN QPSK
Modulation rate 3.84 Mcps
Data transfer
Voice
Mobile phones
Netbooks
New generation coming...
14
Redundancy bits
Code rate
CRC
16
17
18
19
20
21
22
23
WCDMA (air interface)
Omnidirectional
Full-Duplex
Presentation of 3G
The Physical layer
The Data Link layer
15
0
/2
3/2
stages
bit pairs
Unmodulated signal
UE
Node B
Node B
Open loop control: Transmitting entity estmitates power
Monitor the up/down link
transmission buffer
Compare
Full transcript