UNESCO PROJECT Advanced Course on Networking Professor Khalid Al-Begain UNESCO/CISM SECOND ADVANCED...
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UNESCO PROJECT
Advanced Course on Networking Professor Khalid Al-Begain
UNESCO/CISM SECOND ADVANCED SCHOOL OF INFORMATICS
University of Damascus, Syria, 06 - 15 April 2004
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I am Khalid Al-Begain
School of Computing, University of Glamorgan, Wales, UK
Professor in Mobile Networking Head of the Mobile Computing and
Networking Research Group– Performance evaluation Modelling, simulation
and analysis– QoS Routing and Multicast Routing– Resource Management and Call admission Control– Traffic Engineering– Mobile Services for next generation mobile and
wireless networks
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Course Content Four Lectures A combination of essential and advanced
topics New compared with last year : WIRELESS The Course covers
LANs and WLAN standards TCP/IP Theory : Protocols and Applications Wireless and Cellular Networks: Channel
Allocation Schemes
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LAN versus WAN -RevisitedLocal Area Networks Wide Area Networks
Geographical Coverage Limited (room, building, campus) Widespread (country, worldwide)
Data Rates High - typically 1M to 1Gbps Historically low <= 64Kbps.Now much higher up to 2.4G
Transmission Media
Private (coax, twisted-pairs, optic fibres, radio)
Use of “Common Carriers” (BT, Mercury)
(Fibres, microwaves, satellite…)
Error Rates Low Better than 1 in 1010
Historically hightypically worse than 1 in 106.Now comparable with LANs
Types Ethernet (IEEE 802.3)Token Ring (IEEE 802.5)Token Bus (IEEE 802.4)Wireless (IEEE 802.11), Bluetooth
Packet Switching (ITU X.25)Cell Switching (ATM)Circuit Switching (ITU ISDN)
Access Multiple Access Individual Access Links
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LANs: Major medium access techniques
Access methods
Carrier sense multipleaccess (CSMA)
Token passing
p-persistentCSMA
Tokenring
Tokenbus
Slottedring
CSMA/CD CSMA/CA
Dedicated lines
Demandpriority
Switching
Access methods
Carrier sense multipleaccess (CSMA)
Token passing
p-persistentCSMA
Tokenring
Tokenbus
Slottedring
CSMA/CD CSMA/CA
Dedicated lines
Demandpriority
Switching
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LANs: Major medium access techniques
Access methods
Carrier sense multipleaccess (CSMA)
Token passing
p-persistentCSMA
Tokenring
Tokenbus
Slottedring
CSMA/CD CSMA/CA
Dedicated lines
Demandpriority
Switching
Access methods
Carrier sense multipleaccess (CSMA)
Token passing
p-persistentCSMA
Tokenring
Tokenbus
Slottedring
CSMA/CD CSMA/CA
Dedicated lines
Demandpriority
Switching
CD: Collision Detection
Ethernet, Fast Ethernet
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LANs: Major medium access techniques
Access methods
Carrier sense multipleaccess (CSMA)
Token passing
p-persistentCSMA
Tokenring
Tokenbus
Slottedring
CSMA/CD CSMA/CA
Dedicated lines
Demandpriority
Switching
Access methods
Carrier sense multipleaccess (CSMA)
Token passing
p-persistentCSMA
Tokenring
Tokenbus
Slottedring
CSMA/CD CSMA/CA
Dedicated lines
Demandpriority
Switching
CA: Collision Avoidance
WLAN, Bluetooth
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IEEE 802 :LANs
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The Data Link Layer
Logical Link Control Sublayer
Medium Access Sublayer
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IEEE 802
Important
The future will tell!
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IEEE 802.3
Classic Ethernet (10 Mbps) (First Founded by Xerox in 1976)
Fast Ethernet (100Mbps) (IEEE 802.3u)
Gigabit Ethernet (1Gbps) (IEEE 802.3z)
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Classical Ethernet
The most common cabling methods
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Classical Ethernet
The most common cabling methods
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Manchester Encoding
Used in Classical Ethernet
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Ethernet : Frame Formats
Two versions exist: (a) DIX (Digital, Intel, Xerox)(b) IEEE 802.3
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Ethernet Medium Access CSMA All stations are connected to the cable When a station wishes to transmit, it “listens” to
the cable - if there is no signal it starts to transmit, otherwise it tries again later.
(Non-Persistent, 1-Persistent, p-Persistent) Whilst a station is transmitting it compares the
signal on the coax with the signal it is transmitting - if they are different it stops and tries again later
CD: Collision Detection means when detects collision then stop transmission wait random time try again
The time to wait is calculated using the Binary Exponential Backoff algorithm.
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Collision Detection
Cause: Signals need time to propagate!
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Binary Exponential BackoffTime slot = 51.2μs
Binary Exponential Backoff:
• After 1st collision each participating station waits randomly 0 or 1 slot
• After 2nd collision each participating station waits 0,1,2, or 3 slots
• After n-th collision each participating station waits between 0 .. 2n-1 slots
• Maximum Backoff = 1023 slots
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Beyond the 10Mbps The early1980s luxury:
8 MHz PC 256 KByte RAM 10 MByte Hard Disk Connected to the Dream 10Mbps LAN
But Parkinson’s Law is valid here too:“Work Expands to fill the time available for its
Completion”
In other words:“Data expands to fill the bandwidth available for their
transmission”
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The 100Mbps LAN Many proposals came to have faster LANs or
MANs FDDI : Fibre Distributed Data Interface DQDB : Dual Queue Dual Bus Fibre Channel
Common Feature : Very complexHigh Cost
However for a technology to work, it must be follow the KISS Law:
“Keep It Simple, Stupid”
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Fast Ethernet
1992 : the IEEE 802.3 committee again.
Task: make faster LAN. Results:
Fast Ethernet (IEEE 802.3u) which is in principle identical to Ethernet except that bit time is 10ns instead of 100ns.
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Fast Ethernet Cabling
• Fast Ethernet uses either HUBs or Switches
• No Manchester Encoding
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Gigabit Ethernet
1995: the same idea: make Ethernet 10 time faster.
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The Ethernet real Competitor: Let us Go Wireless
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Who is interested?
Desktop and laptop systems Handheld devices
PCs, scanners, data collection devices PDAs Palmtops etc
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WLAN implications
Multiple propagation pathways Signal interference Lifetime of battery Security Path loss Installation and connectivity Health
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IEEE 802.11
1997 standard 2.4GHz 1Mbit/s and 2Mbit/s FHSS and DSSS
1999 standard 802.11a
5 GHz - Orthogonal FDM up to 54 Mbit/s
802.11b 2.4 GHz - DSSS up to 11 Mbit/s
Logical Link
Control (LLC)
Media Access
Control (MAC)
Frequency
Hopping
Direct
Sequence
Infrared
light
PhysicalLayer
Data Link layer
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IEEE 802.11a,b Pros & Cons! IEEE 802.11a
+ Very high data rates- 5 GHz licensing problem- Competition with ETSI HiperLAN 2 - Illegal in Europe- Higher cost
IEEE 802.11b+ Works in the Unlicensed band of 2.4 GHz~ Data rates comparable with LANs- Interference with Cordless phones and Microwave
ovens+ Cheaper devices
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WLAN
Two modes of operation(a) Centralised(b) Ad hoc
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A multicel 802.11 network
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IEEE 802.11 MAC
The hidden Station problem:
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Distributed Coordination Function (DCF)
To solve the problem of Hidden stationUse DCF: Uses CSMA/CA (Collision Avoidance) It is based on virtual channel sensing
All WLANs must support DCF.For centralised WLANs, there is also
PCF (Point Coordination Function)
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Virtual Channel Sensing using CSMA/CA
Example: A, B, C, and D stations (D out of the range of A)
Request To Send Clear To Send
Network Allocation Vector
Due to unreliable medium
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Frame Fragmentation
Because the radio link is unreliable short frames are needed long frames has to be fragmented.
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Interframe Spacing in 802.11
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IEEE802.11 Frame Structure
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IEEE802.11 MAC Services
Distribution system services Association Disassociation Re-association Distribution Integration
Station services Authentication De-authentication Privacy Data Delivery
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What else in Wireless
Bluetooth (IEEE 802.15) Broadband Wireless (IEEE 802.16)
And the Cellular Wireless Technologies GSM, GPRS, and UMTS
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What else in Wireless
Bluetooth (IEEE 802.15) Broadband Wireless (IEEE 802.16)
(will follow but very briefly)
And the Cellular Wireless Technologies GSM, GPRS, and UMTS
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Bluetooth
1994: Ericsson SIG started(with IBM, Intel, Nokia and Toshiba)
Named after Viking King Harald Blaatand (Bluetooth) who unified Denmark and Norway without wires!!
Goal: Short-range, inexpensive (<$5) method to connect devices without wires (E.g., mobile-PDA)
July 1999, PAN (Personal Area Network) standard IEEE 802.15
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Bluetooth Characteristics Works in the 2.4 GHz band (together
with WLANs and microwave ovens) Low range (< 10m) 79 channels each with 1MHz 1Mbps Organised into pico-cells (1 Master and
7 slaves) Uses FHSS (Frequency Hopping)
controlled by Master (1600 hops/sec) Uses same Frequency band and hoping
as WLAN (problem!!!)
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Bluetooth Architecture
Scatternet, 255 parked slaves, Ad hoc
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Bluetooth Services
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Broadband Wireless IEEE802.16
Wireless MAN or Wireless Local Loop High data rates to Buildings Can be seen as Wireless Cable TV
network. Uses bandwidth between 10-66 GHz Uses sophisticated modulation to
achieve high rates
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IEEE 802.16 Transmission Environment
For example: with 25MHz spectrum rates are : 150, 100, 50 Mbps