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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
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
Broadband Applications

Bhaskar Ramamurthi

coverage and capacity
Coverage and Capacity
  • 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

slide5

Cell Tower

Fiber Network

Sharing of Infrastructure

Bhaskar Ramamurthi

slide6

Gsm/cdma 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

PROPOSED BROADBANDADDITION

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

PROPOSED BROADBANDADDITION

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
Imminent Technology : 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
Imminent Technology : 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
Imminent Technology : 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
Imminent Technology : 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
Emerging Technology : 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

technology summary
Technology Summary

ST-DL : Sector Throughput (down link)

Bhaskar Ramamurthi

cable cordect an innovation
Cable corDECT : an Innovation
  • 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
Centre of Excellence in Wireless Technology (CEWiT)
  • 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

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