Performance of an Efficient Backoff Retransmission Algorithm with a Proactive Jamming Scheme for Realtime transmission in Wireless LAN 


Vol. 31,  No. 2, pp. 98-106, Feb.  2006


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  Abstract

In order to provide a realtime transmission over a wireless LAN, we here present a new jamming based retransmission mechanism. In a legacy wireless LAN system, all stations use the binary exponential backoff algorithm to avoid collisions among frames. It is well known that the backoff algorithm causes more collisions as the numbers of active stations increases. This makes transmission of real time traffic hard.
In the proposed scheme, when each station senses collisions, it promptly allows to send a jamming signal during a unique jamming window period which is determined by its own channel access count database(CACDB). This jamming windows is chosen not to be overlapped each other by using of CACDB, and thus channel access of another station is prevented. Hereafter the station gets the ownership of the medium when the wireless medium becomes idle after sending the jamming signal and sensing carrier, and then sends frame in medium. In our proposal, repeating collisions is never happened. We here assume that real time traffic use a frame of fixed length in order to make the time for receiving its ACK frame same.
Comparing the proposed jamming-based retransmission scheme with the the 802.11 and 802.11e MAC by simulation, one can find that the proposed scheme have advantages in terms of delay, average backoff time, and average number of collisions per frame. One can find that the proposed scheme might be practically applicable to several applications of realtime traffic transmission in wireless LAN systems.

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  Cite this article

[IEEE Style]

D. Koo and C. Yoon, "Performance of an Efficient Backoff Retransmission Algorithm with a Proactive Jamming Scheme for Realtime transmission in Wireless LAN," The Journal of Korean Institute of Communications and Information Sciences, vol. 31, no. 2, pp. 98-106, 2006. DOI: .

[ACM Style]

Do-Jung Koo and Chong-Ho Yoon. 2006. Performance of an Efficient Backoff Retransmission Algorithm with a Proactive Jamming Scheme for Realtime transmission in Wireless LAN. The Journal of Korean Institute of Communications and Information Sciences, 31, 2, (2006), 98-106. DOI: .

[KICS Style]

Do-Jung Koo and Chong-Ho Yoon, "Performance of an Efficient Backoff Retransmission Algorithm with a Proactive Jamming Scheme for Realtime transmission in Wireless LAN," The Journal of Korean Institute of Communications and Information Sciences, vol. 31, no. 2, pp. 98-106, 2. 2006.

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pISSN : 1226 - 4717
eISSN : 2287 - 3880