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Telecommunications in ITS WiMAX

Telecommunications in ITS WiMAX. Ing. Martin Šrotýř srotyr@fd.cvut.cz. Access systems. CATV. Metalic. xDSL. Fixed. PLC. Ethernet. Optic. AON. Access network. PON. WiFi. Fixed. W ireless. WiMAX. Nom a d ic. GSM,UMTS. Mobil e. Satelit. Access systems. CATV. Metalic. xDSL.

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Telecommunications in ITS WiMAX

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  1. Telecommunications in ITSWiMAX Ing. Martin Šrotýř srotyr@fd.cvut.cz

  2. Access systems CATV Metalic xDSL Fixed PLC Ethernet Optic AON Access network PON WiFi Fixed Wireless WiMAX Nomadic GSM,UMTS Mobile Satelit

  3. Access systems CATV Metalic xDSL Fixed PLC Ethernet Optic AON Access network PON WiFi Fixed Wireless WiMAX Nomadic GSM,UMTS Mobile Satelit

  4. WiMAX – IEEE 802.16 Working Group was established in 1999 10 - 66 GHz, only Line Of Sight (LOS) Transfer speed up to 134 Mbit/s 2 - 11 GHz, Non Line Of Sight (NLOS) Transfer speed up to 75 Mbit/s Revision 802.16 (3,5 GHz FDD, TDD) Unification previous 802.16 standards Mobile version of WiMAX Equipment supported speed up to 150 km/h

  5. WiMAX – IEEE 802.16 802.16e • Mobile supplement • Allowhigh speed handover 802.16a 2 - 11 GHz licenced band NLOS Support of MESH architecture 802.16b Unlicenced band Brings QoS for real-time applications 802.16c 10 - 66 GHz 802.16d Revision 802.16a andstandards unification

  6. WiMAX – IEEE 802.16

  7. WiMAX – Radio parameters Range / speed RLC (Radio Link Control) QoS (Quality of Service)

  8. Modulation / bandwidth QPSK 1/2 QPSK 3/4 16 QAM 1/2 16 QAM 3/4 64 QAM 2/3 64 QAM 3/4 1,75 MHz 1.45 2.18 4.36 5.82 6.55 2.91 3,5 MHz 5.82 8.73 13.09 4.36 11.64 2.91 7,0MHz 5.82 11.64 17.45 23.27 26.18 8.73 14,0 MHz 11.64 17.45 23.27 34.91 46.55 52.36 20,0 MHz 24.40 32.53 48.79 65.05 16.26 73.19 WiMAX– Teoreticalspeed v Mbps ForOFDM with 256 sub-carrier included MAC and other layers direction.

  9. window/fix antena roof antena indoor/portable antena Type of area <20 Km inNLOS* Rural <8 Km <4 Km Small town <4 Km <2 Km N/A N/A City <2 Km <1 Km WiMAX – Teoretical coverage in km Approximate distance, it is very dependent on area character *<50 Kmis the theoretical maximum for the line of sight.

  10. WiMAX – architecture P2MP (Point-to-MultiPoint) MESH topologie

  11. WiMAX – architecture 4 layers~ agree with 2 lowest OSI layers

  12. WiMAX – physical layer Modulation setting using adaptive profilesParameters can be changed for every frameProfilesare identified by „Interval Usage Code“ (DIUC a UIUC) Allows usage of SMART directional antennas - increases the range Allows usage of two different duplexing schemesFDD (Frequency Division Duplexing)TDD (Time Division Duplexing) Support full duplex and half duplex devices

  13. WiMAX – physical layer CommonframeFramefor band reservation Frames and time segments for duplex transfers with time division Frame structure

  14. WiMAX – physical layer Framestructure Commonframe Framefor band reservation

  15. msb lsb Generic MAC CRC payload (optional) Header MAC PDU (optional) (6 bytes) Generic MAC Header Format BW Req. Header Format (Header Type (HT) = 0) (Header Type (HT) =1) LEN BW Req. H E rs C EKS rs H E msb Type (6 bits) Type (6 bits) T C v I (2) v T C msb (8) (3) CID msb (8) LEN lsb (8) CID msb (8) BWS Req. lsb (8) HCS (8) CID lsb (8) HCS (8) CID lsb (8) WiMAX – MAC layer Downstream (to user) – TDM (Time Division Multiplex) Upstream (from user) – TDMA (Time-Divison Multiple Access) Centralized planner - effective and preferential bandwidthdividing

  16. WiMAX – class of service Constant bit rate (CBR) for applications with stric demand on transfer speed and latency. Variable bit rate in real time (rt-VBR)uses for data transfer which aresensitiveonlatency. Variable bit rate innon real time (nrt-VBR)doesn´t garante latency, strict demandis only on latency value duringtransfer of frame. Best efforts servicewarrants data transferwith best efforts.

  17. WiMAX – application

  18. Thank you for attention.

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