WIRELESS PAN Wireless personal area network Bluetooth RFID ZigBee 15
BLUETOOTH A new global standard for data and voice Interconnecting computer and peripherals, p handheld devices, PDAs, cell phones replacement of IrDA Short range (10 m), low power consumption, license- free 2.4GHz ISM band Developed by Ericsson in 1994 Bluetooth (King of Denmark in the 10 th century) 16
BLUETOOTH APPLICATIONS Headset Keyboard/Mouse GPS etc. 17
WBAN Wearable Computing Environment display communication: WLAN, 3G/4G context sensor array: camera, light, microphone, GPS body area network: wireless distributed reconfigurable computer 18
MOBILE COM. SYSTEMS Introduction 1 st Generation 2G AMPS (USA): analog, FDMA CT1 GSM (Europe and worldwide): digital, TDMA IS-95 (Qualcomm, Korea): digital, CDMA IS-136, PDC, etc. 25G 2.5G cdma2000 1x (2.5G or 3G) 19
MOBILE COM. SYSTEMS Introduction 3G 1xEVDO (3GPP2: Qualcomm): CDMA, fast data (3G or 3.5G) WCDMA (3GPP: Europe, Japan, etc.): CDMA 3.5G HSDPA (3GPP): CDMA, fast data WiBro (IEEE 802.16e): OFDM, fast data 3.9G LTE (3GPP): OFDM, MIMO 4G LTE-Advanced d (3GPP): OFDM, MIMO + alpha IEEE 802.16m (IEEE): OFDM, MIMO + alpha 20
STANDARDIZATION 21
VOICE/DATA in 3G/4G Introduction 3G(WCDMA) 요금 초과데이터이용료 (i요금제): 5,000원 /100MB (~2,000원(LTE)) Voice 데이터율 : 12.2kbps x 2( 양방향 ) 183kB/ 분 100원 / 분가정하면, (100원/ 분 )/(183kB/ 분 )=54,600원/100MB 10배이상차이 ( 음성무제한요금제도입 ) 3G (WCDMA) 4G (LTE) 음성 Circuit switching Packet switching 데이터 Packet switching Packet switching VoIP / mvoip / VoLTE VoLTE 품질은어떻게? VoLTE 요금은어떻게? 22
OTHER EMERGING TECHNOLOGIES Mbil Mobile Ad-Hoc AdH Networks Wireless Sensor Networks UWB Cognitive Radio Femtocell Cooperative Communication Visible Light Communication Wireless Power Transmission & Near Field Communication Compressed sensing M2M Communication 23
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. Routing can be multihop. Topology is dynamic. 24
WIRELESS SENSOR NETWORKS 25
WIRELESS SENSOR NETWORKS (cont d) Characteristics of Sensor Network Nodes powered by nonrechargeable batteries Data flows to centralized location Low per-node rates but up to 100,000 000 nodes Data highly correlated in time and space 26
UWB UWB-RT (Ultra Wideband Radio Technology) Short-range wireless technology Sharing the existing radio spectrum resources 27
Cognitive Radio Characteristics of Cognitive Radio Communication using unused frequencies Most of the radio frequency spectrum is inefficiently utilized. Detecting unused frequencies 28
Femtocell Characteristics of Femtocell Small cellular base station in residential or small business environments Connected to the network via ADSL, etc. 29
Cooperative Communication Joint Transmission/Reception Improving gperformance of cell edge users 30
Visible Light Communication LED Communications Communication by fast blink of LED lights Using worldwide infrastructure of LED lights 거실 까페 / 레스토랑 31
Wireless Power Transmission & Near Field Communication + 결제, 열쇠, 쿠폰다운, 스마트태그등 32
Compressed Sensing Compressed/Compressive Sensing Sampling less than Nyquist rate Cost down of ADC, saving storage, etc. Compressive sampling on compressible sparse signals 33
M-to-M M Communication Introduction Person-to-Person Person-to-Machine Machine-to-Machine 34
Cellular Systems CELLULAR SYSTEMS
Cellular Systems FUNDAMENTALS OF CELLULAR SYSTEMS Ideal cell area Cell BS MS Alternative shape of a cell MS Hexagonal cell area used in most models Illustration of a cell with a mobile station and a base station 2
Cellular Systems CELL SIZE Service area BS BS BS Service area (Zone) BS BS BS Early wireless system: Large zone BS BS Small zone 3
Cellular Systems CONTROL/TRAFFIC CHANNELS Downlink / Uplink Control / Traffic Dedicated / Shared Mobile Station Base Station 4