Medium Access Control Sublayer
Static Channel Allocation
Dynamic Channel Allocation :
Basic Assumptions
Basic assumptions contd…
Multiple Access Protocols
PURE ALOHA
Pure ALOHA contd…
Pure ALOHA contd…
Pure ALOHA contd…
Pure ALOHA contd…
Pure ALOHA contd…
Contd. .
Pure ALOHA contd…
Slotted ALOHA
Slotted ALOHA contd…
Slotted ALOHA
CSMA : Carrier Sense Multiple Access Protocols
CSMA contd…
1 -persistent contd. .
Nonpersistent CSMA
p- persistent CSMA
Comparison
CSMA/CD: CSMA with Collision Detection
CSMA with Collision Detection
What should be the size of the contention interval?
CSMA/CD contd. .
CSMA/CD
Collision-Free Protocols
Collision-Free Protocols
Performance
Collision-Free Protocols (2)
Channel efficiency
A Variation of Binary countdown – by Mok and Ward(1979)
Revisit p-persistent Protocol
when k is small I. e. limited contention
Performance Comparison
Limited- Contention Protocols
Assign stations to groups dynamically
Adaptive Tree Walk Protocol
How far down the tree the search must begin?
WDMA: Wavelength Division Multiple access : MAC sub-layer in optical networks
Contd. .
More topics for presentation(1 person each)
3 types of traffic
Dynamic WDMA contd…
Variable Data Rate CO traffic
Constant Data Rate COO
Data-gram traffic
MAC Sub-layer in Wireless LANs
Wireless LANs
WLANs contd. .
Can we use CSMA?
Wireless LAN Protocols
Problem near the receiver
Simultaneous transmissions are possible in WLANs
Wireless LAN Protocols (2)
MACA : Multiple Access with Collision Avoidance
Effect of MACA on other stations
Collisions may still occur
Data Link Layer Switching
Data Link Layer Switching
Why LAN of LANs?
Bridges from 802. x to 802. y
Difficulties in bridging 802. x with 802. y
Bridges from 802. x to 802. y (2)
Local Internetworking
Routing in Interconnected LANs
Routing in Interconnected LANs
Spanning Tree Bridges (2)
Remote Bridges
Repeaters and Hubs : Physical Layer
Switches and Bridges : DLL
Virtual LANs (2)
The IEEE 802. 1 Q Standard
The IEEE 802. 1 Q Standard (2)
Summary
MACAW (MACA for wireless) by Bhargavan et al
I Acknowledge
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