Wireless: Solution for high-speed Internet access in regional Queensland Presenter: Mr. Huan Pham...
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![Page 1: Wireless: Solution for high-speed Internet access in regional Queensland Presenter: Mr. Huan Pham (PhD student) Supervised by Dr. Bill Lavery James Cook.](https://reader031.fdocuments.net/reader031/viewer/2022013004/56649da15503460f94a8d823/html5/thumbnails/1.jpg)
Wireless:Wireless: Solution for high-speed Internet access Solution for high-speed Internet access
in regional Queenslandin regional Queensland
Wireless:Wireless: Solution for high-speed Internet access Solution for high-speed Internet access
in regional Queenslandin regional Queensland
Presenter: Mr. Huan Pham (PhD student)
Supervised by Dr. Bill Lavery
James Cook University
![Page 2: Wireless: Solution for high-speed Internet access in regional Queensland Presenter: Mr. Huan Pham (PhD student) Supervised by Dr. Bill Lavery James Cook.](https://reader031.fdocuments.net/reader031/viewer/2022013004/56649da15503460f94a8d823/html5/thumbnails/2.jpg)
Internet Access PlatformsInternet Access PlatformsInternet Access PlatformsInternet Access Platforms
Twisted pair
Coax/Fibre
Optical Fibre
Wireless
• Cable modem
•Tel modem•ISDN•xDSL
•FTTH•Fibre ring
•MMDS•LMDS
•Satellite
![Page 3: Wireless: Solution for high-speed Internet access in regional Queensland Presenter: Mr. Huan Pham (PhD student) Supervised by Dr. Bill Lavery James Cook.](https://reader031.fdocuments.net/reader031/viewer/2022013004/56649da15503460f94a8d823/html5/thumbnails/3.jpg)
Internet
xDSL modem
xDSL modem
ISDN adapter
Telephone modem
Exchange
ISP
Twisted PairTwisted PairTwisted PairTwisted Pair
![Page 4: Wireless: Solution for high-speed Internet access in regional Queensland Presenter: Mr. Huan Pham (PhD student) Supervised by Dr. Bill Lavery James Cook.](https://reader031.fdocuments.net/reader031/viewer/2022013004/56649da15503460f94a8d823/html5/thumbnails/4.jpg)
Twisted Pair CapacityTwisted Pair CapacityTwisted Pair CapacityTwisted Pair Capacity
Telephone modem < 64 Kbit/s (for download, lower for upload)
ISDN Basic 128 Kbit/s, (bi-directional)
xDSL Symmetrical or Asymmetrical Maximum download rate from 1.5 Mbit/s to 50 Mbit/s depending
on the technology and distance. Upload rate for asymmetrical case: dozens Kbit/s
Distance limit: < 5 km from CO or Remote access terminal Access capacity not shared by other users.
![Page 5: Wireless: Solution for high-speed Internet access in regional Queensland Presenter: Mr. Huan Pham (PhD student) Supervised by Dr. Bill Lavery James Cook.](https://reader031.fdocuments.net/reader031/viewer/2022013004/56649da15503460f94a8d823/html5/thumbnails/5.jpg)
Coax/Fibre cableCoax/Fibre cableCoax/Fibre cableCoax/Fibre cable
Internet
Cable Modem
ISP
NIU
Fibre Node
Cable Modem
NIU
Fibre Node
Coaxial Cable
Optical Fibre
![Page 6: Wireless: Solution for high-speed Internet access in regional Queensland Presenter: Mr. Huan Pham (PhD student) Supervised by Dr. Bill Lavery James Cook.](https://reader031.fdocuments.net/reader031/viewer/2022013004/56649da15503460f94a8d823/html5/thumbnails/6.jpg)
Coax/Fibre CapacityCoax/Fibre CapacityCoax/Fibre CapacityCoax/Fibre Capacity
Downstream up to 30 Mbit/s Upload up to 10 Mbit/s Bit rate is shared among subscribers passed by
coax cable. --> bit rate/user is lower
![Page 7: Wireless: Solution for high-speed Internet access in regional Queensland Presenter: Mr. Huan Pham (PhD student) Supervised by Dr. Bill Lavery James Cook.](https://reader031.fdocuments.net/reader031/viewer/2022013004/56649da15503460f94a8d823/html5/thumbnails/7.jpg)
Wireline advantages/disadvantagesWireline advantages/disadvantagesWireline advantages/disadvantagesWireline advantages/disadvantages
Advantages Potentially offer very high bit rate More reliable (less affected by noise, interference,
weather conditions) Disadvantages
High up-front investment in cabling, environment issues, permission to lay cable...
Much higher cost per user in low population density areas
Higher deployment time Monopoly by cabling companies
![Page 8: Wireless: Solution for high-speed Internet access in regional Queensland Presenter: Mr. Huan Pham (PhD student) Supervised by Dr. Bill Lavery James Cook.](https://reader031.fdocuments.net/reader031/viewer/2022013004/56649da15503460f94a8d823/html5/thumbnails/8.jpg)
Wireless OptionsWireless OptionsWireless OptionsWireless Options
MMDS (and other WLL operating at 2 - 5 MHz)
LMDS (Local Multipoint Distribution Services)
Satellite
Mobile
![Page 9: Wireless: Solution for high-speed Internet access in regional Queensland Presenter: Mr. Huan Pham (PhD student) Supervised by Dr. Bill Lavery James Cook.](https://reader031.fdocuments.net/reader031/viewer/2022013004/56649da15503460f94a8d823/html5/thumbnails/9.jpg)
MMDSMMDSMMDSMMDS
Main transmitter
Repeater
Internet Point of Presence
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MMDSMMDSMMDSMMDS
Frequency 2.1 GHz, 2.3 GHz (in Australia) Line of sight transmission Not vulnerable to rain Maximum coverage distance = 50 km Normally one way - telephone cable return Two-way MMDS is more costly and limited by available
bandwidth Bandwidth is shared among all (online) users Frequency reuse can be made by using n-sector antennas,
and/or cellular layout (the latter is subject to ACA regulation)
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MMDS CapacityMMDS CapacityMMDS CapacityMMDS Capacity
Assumptions:MMDS Channel: 6MHz
Modulation scheme: QAM-64
Customer peak offered rate: 400 (Kbit/s)
Statistical multiplexing gain: 5
User time online: 20%
Capacity:Number of users (one sector):
Number of users (four sectors): 4 x 2000 = 8000
2000)/(400%20
5)/(30
sKbit
sMbit
30Mbit/s
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Other Frequency OptionsOther Frequency OptionsOther Frequency OptionsOther Frequency Options
2 x 150 MHz frequency at 3.4 GHz band. (this is to
be auctioned later this year)
Unlicensed frequency band at 2.4 GHz and 5GHz
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LMDSLMDSLMDSLMDS
Frequency: 28 GHz Strict line-of-sight transmission Signal absorbed by rain (See Signal in Rain graph) Cellular layout. Cell size (<5 km) mainly depends on:
transmitter power modulation scheme rain rate required availability
Frequency reuse made possible by n-sector antennas cellular layout cross-polarisation transmission
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LMDS CapabilityLMDS CapabilityLMDS CapabilityLMDS Capability
AssumptionsBandwidth 2x75 (MHz)
Modulation scheme QAM-16
Frequency reuse factor/cell: 4
Cell size (square): 5(km) x 5(km)
CapacityBit rate / cell: 400 (Mbit/s)(able to support about 1000s online users, peak rate a couple of Mbit/s)
Bit rate / km2: 16 Mbit/s/km2
~100 Mbit/s each way
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LMDS Hexagon layoutLMDS Hexagon layoutLMDS Hexagon layoutLMDS Hexagon layout
Frequency reusefactor = 4
Frequency reusefactor = 3
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LMDS Square LayoutLMDS Square LayoutLMDS Square LayoutLMDS Square Layout
Frequency reusefactor = 1
Frequency reusefactor = 2
Frequency reusefactor = 4
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SatelliteSatelliteSatelliteSatellite
Web server
Internet
Satellite
ISP
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Satellite CapabilitySatellite CapabilitySatellite CapabilitySatellite Capability
Satellite operates at C-band (4-8GHz) or Ku-band (12-
18GHz) which is affected by weather condition.
Large coverage areas, virtually anywhere.
It’s difficult to apply frequency reuse. Thus it offers limited
bit rate/user.
Commonly available with one-way Internet access, return
via telephone modem. Typically 400Kbit/s download
Suits non real-time applications
Suitable for areas where other options are not available
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SummarySummarySummarySummary Advantages of Wireless over Wireline
Scalability Lower up-front investment Fast deployment time Ability to bypass the incumbent Telco.
Limitations Limited bandwidth Affected by noise, interference, weather conditions Latency of satellite systems limit real-time applications
The advantages make them suitable for low density population areas in regional Queensland such as Townsville & Carne.
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Current ResearchCurrent ResearchCurrent ResearchCurrent Research
Performance of TCP over wireless and...
How to facilitate QoS (Quality of Service) over
wireless link
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Questions?Questions?Questions?Questions?
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Thank you!Thank you!
The EndThe End
Thank you!Thank you!
The EndThe End
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