a direction based call admission control

of 21 /21
Mobile Multimedia Communications An Emerging Technology Presented by: Dr. M. Mahfuzul Islam Department of Computer Science and Engineering Bangladesh University of Engineering and Technology

Author: dominque23

Post on 19-May-2015




1 download

Embed Size (px)


  • 1. Mobile Multimedia Communications An Emerging Technology Presented by: Dr. M. Mahfuzul Islam Department of Computer Science and Engineering Bangladesh University of Engineering and Technology

2. Presentation Objectives

  • What is Mobile Multimedia Communication?
  • Wireless networks: An Emerging Technology.
  • Research Problems
  • Conclusions

3. Mobile Multimedia Communications

  • Integrate voice, audio, text and video.
  • Connectivity
  • Combine Wireless and wired medium.
  • AllowTerminal MobilityandPersonal Mobility
  • CombineTelecommunicationsandComputing Technology .

MSC PSTN Wireless Connection Optic Fibre Wired Connection Movie Server Base Station 4. Wireless Technology: the new vision

  • Current wireless uses
  • Wireless long distance
  • Wireless LANs
  • Wireless local Loops (WLLs)
  • Personal area networks (PANs)
  • M-Commerce

5. Wireless Technology: the new vision Wireless Long Distance 1G Analog AMPS TACS NMT RTMS 2G narrowband Digital GSM IS-54/136 TDMA ISS-85/cdmaOne PDC 2G+ or 2.5G Voice and Data GPRS, HSCDS GSM IS-136A & 8 TDMA IS-95c cdmaOne 3G Broadband DigitalW. CDMA UWC-136 cdma2000 Voice Very small data American Roaming Enhanced Voice some data International Roaming Voice Enhanced data E-mail Internet Broadband data Video Fast Internet Remote Access 6. Wireless Technology: the new vision Wireless Long Distance: GSM The most popular 2G cellular standard developed to cater voice services and data delivery using digital modulation.

  • Development background :
  • Developed byGroupe Sp ciale Mobile(founded 1982) which was an initiative of CEPT (Conference of European Post and Telecommunication).
  • In 1989,ETSI(European Telecommunications Standards Institute) took the control of GSM and defined new acronym Global System for Mobile Communications .
  • Commercial usehas been started since 1991 .
  • Features of GSM Standards :
  • Supportsinternational roamingandhandheld terminals .
  • Good subjectivespeech qualityand wide-range ofnew services .
  • Low cost (?) .
  • Compatiblewith other systems, say ISDN and PSTN.
  • 2.5G Cellular:
  • Extends the 2G technologies GSM, TDMA, CDMA.GPRS(general packet radio systems) technology is used to adddata capacity .

7. Wireless Technology: the new vision Wireless Long Distance

  • 3G Cellular:
  • Thegoals of 3Gare to provide-
    • WANsfor PC and multimedia, allowing for bandwidth on demand.
    • flexibility to supportmultiple standards
    • integrate fixed wireless access services, satellite services and cellularat data rates 384 kbps for mobile, and 2 mbps for fixed.
  • CDMAis the universal standard for 3G, but face the same pricing issue at 2.5G(time basis charge).
    • Court battles over the leased spectrum.
    • costs to deploy not seen as tenable.
  • 4G Cellular:
  • Broadband IPcould provide 4G services(since 2003).
  • Userspayfor different kind of services.
  • The service isIP basedand looks like wired services accessed via a browser.

New entrants are looking for 3G alternatives.

  • VSAT(very small aperture terminal) :
  • Stationary wireless Broadbandis best provided by VSAT.
  • Many country is taking off.
  • Small VSAT dishes, speed 0.5 mbps.


  • There are three main components of GSM networks:
  • Mobile Terminal (MT)
    • Mobile equipmentfor transmitting and receiving signals.
    • Subscriber Identity Module (SIM)for storing necessarypermanent and temporary data.
  • Base Station (BS)
    • Base Transceiver System (BTS)for
      • transmitting and receiving signals; and
      • manipulating signals
    • Base station Controller (BSC)for
      • assigning and managing resources,
      • controlling handoff and power level, etc.
  • Mobile Switching Centre (MSC)
    • Manage communications, mobility, and billinginformation.
  • Home Location Register (HLR):central master database for users under the MSC.
  • Visitor location Register (VLR):Local database for the users currently under the domain of MSC.
  • Authentication Center (AuC):Authenticate mobile terminals and encrypt user data.
  • Equipment Identity Register (EIR):register MTs and locked stolen or malfunctioning MTs.

Wireless Technology: the new vision Wireless Long Distance: GSM Network Components Base Transceiver System (BTS) Base Station Controller (BSC) Base Station (BS) VLR HLR EIR AuC Mobile Switching Centre (MSC) PSTN Other GSM Mobile Terminal (MT) Wireless Connection P2PWireless or optic fiber connection 9. Wireless Technology: the new vision Wireless LAN

  • Wireless LAN
  • Used within abuildingor among buildings on acampus .
  • Wireless LANs are not generally replacing existing wired LANs butextendingthem to portable devices.
  • Example:In hospitals, doctors and nurses can use handheld or notebook computers to record patient data at the bedside, which is faster than using a wired computer.
  • WLANs use two technologies:infraredandmicrowave .
  • Cannot penetratesolids such as walls, ceiling, dust or rain. So, transmitter and receiver must be in line of sight.
  • Microwave and radio-frequency (RF) are themost popularWLAN technology because the signals can go through the walls.

10. Wireless Technology: the new vision Wireless LAN Wireless LANuse two topologies:peer-to-peerandclient-server .

  • Peer-to-peer: each unit communicate with every other units.
  • Less expensivebecause the system has no central controlling unit.
  • Performance decreasesas traffic increase because more and more collisions occur.

Client-Server: Serveris the central coordinating node. It communicates with the clients wirelessly and links to awired LANon behalf of those clients. 11. Wireless Technology: the new vision Wireless LAN

  • Wi-Fiis the 802.11b wireless Ethernet standard that transmits up to 11 Mbps
    • connection iseasy .
    • Wi-Fi networks run inunlicensed bandwidth .
    • Appear in a place wherepeople congregatesuch as airports, hotels, conference centers, and coffee houses.
    • For many people, WLAN services could be equivalent to3Gat about 1/13 ththe current cost.
  • Self-organizing Meshis a new idea in WLAN arena
    • Operate inpeer-to-peermode
    • Amessageis routed to the nearest access point the closest device which routes it to the next nearest point, and so on.
    • The unusual phenomenon is thatthe more users, the more capacity . This technology could strongly influence the future of wireless.

12. Wireless Technology: the new vision

  • Wireless Local Loop:
    • With the goal ofreplacing the wireline link .This fixed wireless solves the last mile problem.
    • UseRF technologybetween a home or business and a telephone companys central office.
    • One approach is toplace antennas on light poststo form a wireless mesh.
    • Fixed wireless is being used indeveloping countriesandremote locationsin place of wire because these networks are more rapidly deployed and less costly that buying cables.
      • Some developing countries are bypassing wiring altogether.
  • Wireless PAN(Personal Area Network) :
    • A short distance network about 30 feet (10 meters).
    • The main technologies used areinfraredandBluetooth .
    • This new kind of network could be used to synchronize laptop and a PDA, link several laptops in a rooms, etc.
  • M- Commerce: Conduct commerce digitally from wireless devices.
    • Location-based servicesandpersonalizationare important part of wireless economy .
    • Due to small antennas and low power, the handheld devicecant send signalsto satellite for measuring location using GPS.

13. Research Challenges Wireless Resources . Bandwidth in wired media 600 Mbps for 1 ATM line 600 Mbps for 1 ATM line Bandwidth in wireless media 384 Kbps for cell radius 10 km ( 2G / 2.4G) / 2 Mbps for cell radius