VOICE/DATA in 3G/4GVOICE/DATA in 3G/4G
Transcript of VOICE/DATA in 3G/4GVOICE/DATA in 3G/4G
Introduction
VOICE/DATA in 3G/4GVOICE/DATA in 3G/4G3G(WCDMA) 요금• 3G(WCDMA) 요금– 초과데이터이용료(i요금제): 5,000원/100MB (~2,000원(LTE))– Voice 데이터율: 12.2kbps x 2(양방향) 183kB/분– 100원/분 가정하면, (100원/분)/(183kB/분)=54,600원/100MB
10배 이상 차이 (음성 무제한 요금제 도입)
3G (WCDMA) 4G (LTE)음성 Circuit switching Packet switching
데이터 P k i hi P k i hi
• VoIP / mVoIP / VoLTE
데이터 Packet switching Packet switching
– VoLTE 품질은 어떻게?– VoLTE 요금은 어떻게?
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Introduction
OTHER EMERGING TECHNOLOGIESOTHER EMERGING TECHNOLOGIES
M bil Ad H N t k• Mobile Ad-Hoc Networks• Wireless Sensor Networks• UWB• UWB• Cognitive Radio• Femtocell• Femtocell• Cooperative Communication• Visible Light Communication• Visible Light Communication• Wireless Power Transmission & Near Field
Communication• Compressed sensing• M2M Communication
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Introduction
MOBILE AD HOC NETWORKS (MANET)MOBILE AD-HOC NETWORKS (MANET)
• What is MANET?– A set of mobile hosts capable communication with each
other without the assistance of base station.– No backbone infrastructure.
R i b l ih– Routing can be multihop.– Topology is dynamic.
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Introduction
WIRELESS SENSOR NETWORKSWIRELESS SENSOR NETWORKS
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Introduction
WIRELESS SENSOR NETWORKS (cont’d)WIRELESS SENSOR NETWORKS (cont d)
• Characteristics of Sensor Network– Nodes powered by nonrechargeable batteriesp y g– Data flows to centralized location
Low per node rates but up to 100 000 nodes– Low per-node rates but up to 100,000 nodes– Data highly correlated in time and space
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Introduction
UWBUWB
• UWB-RT (Ultra Wideband Radio Technology)– Short-range wireless technology– Sharing the existing radio spectrum resources
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Introduction
Cognitive RadioCognitive Radio
• Characteristics of Cognitive Radio– Communication using unused frequenciesg q
• Most of the radio frequency spectrum is inefficiently utilized.
– Detecting unused frequencies
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Introduction
FemtocellFemtocell
• Characteristics of Femtocell– Small cellular base station in residential or small
business environments– Connected to the network via ADSL etcConnected to the network via ADSL, etc.
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Introduction
Cooperative CommunicationCooperative Communication
• Joint Transmission/Reception– Improving performance of cell edge usersp g p g
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Introduction
Visible Light CommunicationVisible Light Communication
• LED Communications– Communication by fast blink of LED lightsy g– Using worldwide infrastructure of LED lights
거실 까페/레스토랑
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Introduction
Wireless Power Transmission &Near Field Communication
+ 결제, 열쇠, 쿠폰다운, 스마트태그 등
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Introduction
Compressed SensingCompressed Sensing
• Compressed/Compressive Sensing– Sampling less than Nyquist ratep g yq– Cost down of ADC, saving storage, etc.
Compressive sampling on compressible sparse– Compressive sampling on compressible sparse signals
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Introduction
M to M CommunicationM-to-M Communication– Person-to-Person Person-to-Machine Machine-to-Machine
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Cellular Systems
CELLULAR SYSTEMS
Mobile Communications Engineering, Spring 2014 Jae Kyun Kwon, Yeungnam Univ.
Cellular Systems
FUNDAMENTALS OF CELLULAR SYSTEMSFUNDAMENTALS OF CELLULAR SYSTEMS
Ideal cell area
BSCell
MSAlternative
MS
Hexagonal cell area used in most models
Alternative shape of a cell
Illustration of a cell with a mobile station and a base station
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Cellular Systems
CELL SIZECELL SIZEService area
Service area
BS BS
BSService area
(Zone) BS BS BS
Early wireless system: Large zone BS BS
Small zone
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Cellular Systems
CONTROL/TRAFFIC CHANNELSCONTROL/TRAFFIC CHANNELS
Downlink / UplinkControl / TrafficDedicated / Shared
Base StationMobile Station
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Cellular Systems
HANDOFF(HANDOVER) REGIONHANDOFF(HANDOVER) REGIONSignal strengthSignal strength Signal strength
due to BSj
Signal strength due to BSi
Pi(x) Pj(x)
E
BS
E
BSMSPmin
BSi X1BSjX3 X4 X2X5 Xth
MS
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Cellular Systems
FREQUENCY REUSEFREQUENCY REUSEF2F7
F2F7 F1
F2
F3F6
F7
F1
F1 F3F6 F4F5 F2F7F1
F4F5 F2F7 F1 F3F6 F1
F1 F3F6 F4F5F1
F4F5Fx: Set of frequency
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7 cell reuse cluster
Cellular Systems
COCHANNEL INTERFERENCECOCHANNEL INTERFERENCEFirst tier cochannel Base StationSecond tier cochannel Base StationSecond tier cochannel
Base Station
RR
D1
D5
D6
1
D2D4 Mobile Station
D3
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Serving Base Station
Cellular Systems
WORST CASEWORST CASE
R
DD5
D6
Mobile StationD1
D2D4
D3
Serving Base Station Co-channel Base Station
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Cellular Systems
COCHANNEL INTERFERENCE RATIOCOCHANNEL INTERFERENCE RATIO
• Cochannel interference ratio– Carrier-to-Interference Ratio (CIR)( )
∑== M
I
CceInterferen
CarrierIC
• For cluster size of 7, M=6∑=k
kIf1
For cluster size of 7, M 6
⎞⎛= 1C
γ
∑= ⎠
⎞⎜⎝⎛M
k
k
RDI
1
−γ
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