Category Archives: Wireless Communication and Networking

Aloha and slotted Aloha protocols

Tuesday, January 16th, 2007

Pure ALOHA protocol
Pure ALOHA protocol is a random access protocol used for data transfer.
User accesses a channel as soon as a message is ready to be transmitted. After a transmission the user waits for an acknowledgement on either the same channel or separate feedback channel. In case of collision (i.e. when a NACK is received), [...]

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TCP/IP and OSI

Tuesday, January 16th, 2007

Transmission control Protocol (TCP) was developed before OSI model. Therefore, the layers in the TCP/IP protocol do not match exactly with those in the OSI model. The TCP/IP protocol is made of 5 layers: physical, data link, network, transport, and application. OSI has 7 layers.

Here follows the comparison:
Application layer of TCP/IP = Session, presentation, and [...]

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