Lecture11 - EETS 8316 Wireless Networks Fall 2013 Lecture...

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EETS 8316 Wireless Networks Fall 2013 Dr. Shantanu Kangude [email protected] Lecture: Cellular Overview: 3G and 4G
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2 Third Generation Systems High-speed wireless communications to support multimedia, data, and video in addition to voice 3G capabilities: voice quality comparable to PSTN 144 kbps available to users over large areas 384 kbps available to pedestrians over small areas support for 2.048 Mbps for office use symmetrical and asymmetrical data rates packet-switched and circuit-switched services adaptive interface to Internet more efficient use of available spectrum support for variety of mobile equipment allow introduction of new services and technologies
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3 Driving Forces Trend toward universal personal telecommunications Universal communications access GSM cellular telephony with subscriber identity module, is step towards goals Personal communications services (PCSs) and personal communication networks (PCNs) also form objectives for third-generation wireless Technology is digital using time division multiple access or code-division multiple access PCS handsets low power, small and light
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4 IMT-2000 Terrestrial Radio Alternative Interfaces
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5 CDMA Design Considerations – Bandwidth and Chip Rate Dominant technology for 3G systems is CDMA – 3 CDMA schemes, share some design issues Bandwidth (limit channel to 5 MHz) – 5 MHz reasonable upper limit on what can be allocated for 3G – 5 MHz is enough for data rates of 144 and 384 kHz Chip rate – given bandwidth, chip rate depends on desired data rate, need for error control, and bandwidth limitations – chip rate of 3 Mbps or more reasonable
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6 CDMA Design Considerations – Multirate Provision of multiple fixed-data-rate channels to user Different data rates provided on different logical channels Logical channel traffic can be switched independently through wireless fixed networks to different destinations Flexibly support multiple simultaneous applications Efficiently use available capacity by only providing the capacity required for each service Two methods Use TDMA within single CDMA channel or use multiple CDMA codes
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7 CDMA Multirate Time and Code Multiplexing
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UMTS Architecture & Domains UTRAN – UMTS Terrestrial Radio Access Network – User Equipment (UE) = Mobile – Node B = Base Station – Radio Network Controller = RNC like BSC Core Network (Reuse GSM CN) – Circuit Switched Domain MSC, GMSC – Packet Switched Domain SGSN, GGSN
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GSM and UMTS High level – Original Src: gsm.htm
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  • Fall '13
  • ShantanuKangude
  • Universal Mobile Telecommunications System, ue, Core network, radio network, tracking area

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