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Enhanced Collision-Free Slotted Aloha with Priority in Contention (SAPC)

Sushil Mehra, Varun Chopra Published in Communications

International Journal of Applied Information Systems
Year of Publication: 2014
© 2013 by IJAIS Journal
10.5120/ijais14-451249
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  1. Sushil Mehra and Varun Chopra. Article: Enhanced Collision-Free Slotted Aloha with Priority in Contention (SAPC). International Journal of Applied Information Systems 7(10):34-40, October 2014. BibTeX

    @article{key:article,
    	author = "Sushil Mehra and Varun Chopra",
    	title = "Article: Enhanced Collision-Free Slotted Aloha with Priority in Contention (SAPC)",
    	journal = "International Journal of Applied Information Systems",
    	year = 2014,
    	volume = 7,
    	number = 10,
    	pages = "34-40",
    	month = "October",
    	note = "Published by Foundation of Computer Science, New York, USA"
    }
    

Abstract

The most simple and easy way of allocating a channel among multiple competing users is an ALOHA protocol and in this paper, a way of allocating a single shared channel among multiple competing users through slotted ALOHA without forming collisions in transmission and starvation to any station during the contention and the transmission period is proposed. The proposed Slotted ALOHA with Priority in Contention (SAPC) is better than original slotted ALOHA as the later one has collisions during the transmission period, which renders the efficiency and leads to long waiting period for stations. The enhancement in SAPC came from using priorities of station in contention slots in a slotted ALOHA (as only one station is allowed to transmit in a given time slot no collision can occur). This method provides a more convenient and efficient way of utilizing the channel among multiple users in a shared environment where collision occurrence is crucial. Also a new station requesting to access the channel is allowed to access the shared channel (assuming it has data of much higher priority) than the rest of the data accumulated by the stations in a shared channel. This condition of high priority data is serviced in this new proposed method SAPC.

Reference

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Keywords

Slotted Aloha, Pure Aloha, Framed Aloha, Collision Free, Contention Resolution, Priority, and Reservation Aloha etc.