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Next-Generation Broadband Wireless Technologies and Standards. Bhaskar Ramamurthi Professor, TeneT Group, Dept. of Electrical Engg., IIT Madras And Centre of Excellence in Wireless Technology, India. Broadband Applications. Coverage and Capacity.

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Next generation broadband wireless technologies and standards l.jpg
Next-Generation Broadband Wireless Technologies and Standards

Bhaskar Ramamurthi

Professor, TeneT Group,

Dept. of Electrical Engg., IIT Madras

And

Centre of Excellence in Wireless Technology, India

Bhaskar Ramamurthi


Broadband applications l.jpg
Broadband Applications Standards

Bhaskar Ramamurthi


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Coverage and Capacity Standards

  • 1 km coverage radius needed in dense urban

    • With 30-40m towers (typical cellular tower)

  • Urban channels typically involve 6-7 walls penetration

  • Implies system gain requirement of ~ 160 dB

  • 2 – 3 km radius coverage needed in suburban areas

    • Same system gain enough due to lower shadow loss

  • 15 – 25 km radius coverage in rural areas

    • 160 dB system gain would be adequate

    • Rooftop (6m) antennas is used on the subscriber side

  • ~ 900 subscribers per cell in all cases

  • Bhaskar Ramamurthi


    Usage and capacity requirements l.jpg
    Usage and Capacity Requirements Standards

    Bhaskar Ramamurthi


    Slide5 l.jpg

    Cell Tower Standards

    Fiber Network

    Sharing of Infrastructure

    Bhaskar Ramamurthi


    Slide6 l.jpg

    Gsm/cdma Standards phones

    GSM/CDMA Network

    0.9/1.8 GHz

    ~100kbps

    Carrier

    BTS

    BTS

    Fiber Network

    BTS

    BTS

    BSC

    MSC/

    HLR/

    BSS/OSS

    BTS

    BTS

    Sharing of Infrastructure

    Bhaskar Ramamurthi


    Slide7 l.jpg

    PROPOSED BROADBAND StandardsADDITION

    GSM/CDMA Network

    0.9/1.8 GHz

    ~100kbps

    Carrier

    Gsm/cdma phones

    MSC/

    HLR/

    BSS/OSS

    BSC

    BTS

    BTS

    Fiber Network

    X GHz

    Y Mbps

    Carrier

    Service 2

    Service 1

    BTS

    BTS

    Broadband

    Wireless Service

    Management,

    Application Gateway

    Laptop/Thin Client/

    Set top box

    BTS

    BTS

    Sharing of Infrastructure

    Bhaskar Ramamurthi


    Slide8 l.jpg

    PROPOSED BROADBAND StandardsADDITION

    Gsm/cdma phones

    GSM/CDMA Network

    Dualmode

    0.9/1.8 GHz

    ~100kbps

    Carrier

    Fiber Network

    MSC/

    HLR/

    BSS/OSS

    X GHz

    Y Mbps

    Carrier

    BSC

    BTS

    BTS

    Service 2

    Service 1

    BTS

    Broadband

    Wireless Service

    Management,

    Application Gateway

    BTS

    Laptop/Thin Client/

    Set top box

    BTS

    BTS

    Sharing of Infrastructure

    Bhaskar Ramamurthi


    Imminent technology wcdma hsdpa l.jpg
    Imminent Technology Standards: WCDMA / HSDPA

    • WCDMA : Wideband Code Division Multiple Access

    • HSDPA : High-Speed Downlink Packet Access

    • Evolution of UMTS (3G)

      • Downlink optimized for broadbandservices

      • Uplink remains WCDMA in first version

    • 5 + 5 MHz channels as in UMTS

    • 1/1 spectrum re-use in every sector

    • Peak data-rate per sector : DL – 14.4 Mbps UL – 2.0 Mbps

    • Users on cell boundaries at a disadvantage

    Bhaskar Ramamurthi


    Imminent technology 1xevdo 1xevdv l.jpg
    Imminent Technology Standards: 1xEVDO / 1xEVDV

    • Evolution of Qualcomm’s 3G-1x CDMA system

      • Downlink optimized for broadbandservices

      • Uplink remains as in 3G1x

    • 1xEVDO : Evolution of single carrier (1x) Data Only

    • 1xEVDV : Evolution of single carrier (1x) Data and Voice

    • 1.25 + 1.25 MHz channels as in 3G1x

    • 1/1 spectrum re-use in every sector

    • Peak data-rate per sector : DL – 3.1 Mbps UL – 1.8 Mbps

    • Users on cell boundaries at a disadvantage

    Bhaskar Ramamurthi


    Imminent technology broadband cordect l.jpg
    Imminent Technology Standards: Broadband corDECT

    • Evolution of India’s corDECT WLL system

    • DECT Air Interface evolved to x3 bit rate

      • Backward-compatible physical layer extension

    • 1/1 spectrum re-use per sector

      • Innovative use of polarization

    • 1.728 MHz channel, TDD

    • Peak Data Rate per sector : DL – 1.44 Mbps UL – 1.44 Mbps

    • Fixed terminals, no mobility

      • Rooftop/window antenna

      • All subscribers get similar service

    • Cost effective

    Bhaskar Ramamurthi


    Imminent technology flash ofdm l.jpg
    Imminent Technology Standards: Flash OFDM

    • Proprietary technology of Flarion Inc USA

      • May evolve into a standard in next one / two years

    • First mobile OFDMA technology to be commercially deployed

    • 1.25 + 1.25 MHz

      • Evolution to 5 + 5 MHz

    • Spectrum re-use 1/1 in every sector

    • Peak Date rate : DL – 3 Mbps UL – 1.5 Mbps

    • VoIP based voice service with low latency

    • QoS for data services

    Bhaskar Ramamurthi


    Emerging technology wimax l.jpg
    Emerging Technology Standards: WiMAX

    • WiMAX : subset (profile) of IEEE 802.16d/e standard

    • .16d 256OFDM : suitable for LOS deployment

    • .16d/e OFDMA : suitable for indoor penetration

    • .16e : also supports mobility

    • Channel Bandwidth : typically 5 or 10 MHz, TDD

    • Spectrum re-use : 1/3 or 1/1 per sector

    • Peak Data Rate : DL + UL - ~4.5 Mbps per MHz

    • Mobility only upto 60 kmph or so initially

    Bhaskar Ramamurthi


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    Technology Summary Standards

    ST-DL : Sector Throughput (down link)

    Bhaskar Ramamurthi


    Cable cordect an innovation l.jpg
    Cable corDECT : an Innovation Standards

    • Innovative broadband solution to compete with wireline

    • Combines Broadband corDECT with downstream cable

    • If TV works, 40 MbpsDL works

      • UL on cable does not work in Indian cable network

    • The only near-term solution for greenfield operator

    Works on Indian Cable network

    Bhaskar Ramamurthi


    Centre of excellence in wireless technology cewit l.jpg
    Centre of Excellence in Wireless Technology (CEWiT) Standards

    • A public-private initiative with funding from govt. and industry

      • currently located at IITM

    • Mission is to make India a global player in wireless space

      • Participate in international standardisation activities

    • Visit cewit.org.in for publications, presentations

      • A study of Broadband Wireless Technologies

      • Broadband Wireless System Requirements for India

      • HSDPA, EVDO, WiMAX, …

    Bhaskar Ramamurthi