Mobile Communication Systems

Introduction, basics of mobile networks:
•    motivations, informations about the specialization, logical architecture of the specialization, interdependencies among subjects
•    broader context of mobile networking as a profession: national and global data regarding this profession: estimate of number of enterprises, number of employees , gross income, share from GDP and short term forecast of these
•    overview of the contents of this semester, explanation of the logical structure of this subject
•    general architecture of mobile networks, paradigm of frequency reuse, cellular theorem
•    logical and physical mobile network topologies, examplified through real networks
Basic mobile and wireless principles
•    problems of user mobility, draft solutions
•    basic concepts of wireless transmission at the level of introduction/refreshment of previously learned: complex representation of baseband signal, bandwidth, carrier frequency, noise/interference, Shannon capacity, attenuation, fading, modulation, intermediate frequency, up/downconversion, filtering, digital filtering, error correction coding, amplification, etc.
GSM system
•    architecture of the network, roles of network elements, logical and protocol architecture
•    developed versions of GSM architecture (based on packet switching)
•    practical implementations, possible configurations, special vendor solutions
GSM radio interface
•    basics of GSM radio: time and frequency division, frame structure, logical channels
•    GSM rádiós interfész alapvető működése: idő- és frekvenciaosztás, keretszerkezet, logikai csatornák
•    details:
o    strucure and elements of GSM base stationsGSM bázisállomás felépítése, elemei -> from early equipment
o    -> to modern base stations ( SDR based base station, multi-standard base station)
o    functions explained in the modern base station architecture: protokoll, baseband, RF
o    some concrete examples and development systems
o    explanation of concrete GSM processes at element level
    coding, modulation, interleaving, burst-assembling, frequency hopping
    applied signel processing methods
•    packed switched GPRS, EDGE interface
3G
•    architecture of 3G networks, role and operation of network equipments
•    operation of 3G radio interface: new paradigm of spread spectrum communications
o    general description and types of spread spectrum systems
o    code division in 3G: application of orthogonal and scrambling codes
o    operation of 3G radio interface: modulation, coding, physical signal processing, channels, logical channels, transport channels, slot and frame structure, available bitrates
3G, 3G developed networks:
•    new paradigm: QoS on the radio interface
o    3G QoS, QoS classes, relation of end to end QoS and radio QoS, radio scheduling methods for QoS
•    further developments of 3G: HSDPA, HSUPA, HSPA+: methods for increased bitrate, new radio solutions:
o    application of AMC, QoS, scheduling
•    development of 3G functional architecture and equipment
o    RNC emulation, multi-standard base station platforms, etc.
•    new radio paradigm: MIMO
o    basics of MIMO and its application methods
o    introduced through the use and MIMO parameters in HSPA
LTE system
•    LTE network: new equipment, their architecture and operation, LTE network interfaces
•    Interworking between LTE and legacy systems. Application of earlier special or vendor specific solutions in LTE.
•    Novelties in the radio network: application of Remote Radio Units. CPRI interface, OBSAI architecture.
LTE rádio interface
•    Overview: FDM, OFDMA basics (in details: other subject of the specialization).
o    introduced through LTE radio interface parameters, uplink and downlink direction
•    AMC, scheduling, QoS, MIMO in LTE
LTE-Advanced: the real 4G
•    new paradigm: carrier aggregation
o    implementation on base station hardware, signal processing challenges, hardware limits
o    recall: dual-cell HSPA within 3G developments
•    new MIMO modes and their effect
•    relay modes and their performance
Outlook: Energy efficiency in mobile networks, through LTE/LTE-Advanced example
•    actual data about consumption of mobile networks
o    power consumption model of mobile base station and base station site
•    energy efficiency metrics of mobile networks
•    methods for reducing consumption
Local networks: 802.11 standards (WiFi)
•    overview of the standards: what the lettes mean, what is the scope of these standards
•    802.11 b,g,a,n,ac -> charachterisation of the physical transmission
o    fraquency band, modulation, coding, signal processing, available rates
Local networks: Bluetooth
o    Operations of Bluetooth radio interface: modulation, frame structure, frequency-hopping, network management
o    differences in Bluetooth versions
o    available bitrates
Personal area networks
•    Vimedia (“wireless USB”)
o    multi-band OFDM, basics, relations to formerly studied systems
o    physical parameters: bands, modulation, coding, bitrates
o    available development environments
•    RFID
o    basic operation, application of RFID, possibilities, basic operational principles
o    available development environments
•    NFC
o    basics of operation, possible use cases, bitrates
o    development environments
o    
Development of custom radio transmission
•    USRP introduction
o    USRP architecture, in light of formerly mentioned base station architectures
•    open source libraries, some example developments
Special networks in industrial environments
•    industrial networks, on-board vehicular networks
o    main differences in contrast with user networks, from networking and wireless perspective
•    basic principles of some quasi standards or vendor specific solutions (wired and wireless):
o    industrial Ethernet, Siemens WirelessHART, Interface Wireless RAD
•    how solutions discussed in these lectures are applied in special industrial solutions
Mobile/wireless networks of the near future (detailed contents refreshed yearly)
•    5G networks
o    increase of traffic, capacity cube, means of serving this
o    “Internet of Things” special traffic and user requirements:machine to machine communications, massive number of terminals (sensor networks), requirements of these, their effect on wireless networks
o    massive MIMO systems; coordinated multipoint; opportunities and constraints
o    filter banks, ultra-wideband communications, current developments
•    attocell networks, use of higher bands: 60 GHz, 120 GHz; visible light based communication systems: LiFi
•    cloud based radio access networks (cloud-RAN)
•    kvantum communications: possibilities and current developments