Design and Analysis of an Acknowledgment-Aware Asynchronous MPR MAC Protocol for Distributed WLANs

Mukhopadhyay, Arpan and Mehta, Neelesh B and Srinivasan, Vikram (2013) Design and Analysis of an Acknowledgment-Aware Asynchronous MPR MAC Protocol for Distributed WLANs. In: IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS, 12 (5). pp. 2068-2079.

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Abstract

Multi-packet reception (MPR) promises significant throughput gains in wireless local area networks (WLANs) by allowing nodes to transmit even in the presence of ongoing transmissions in the medium. However, the medium access control (MAC) layer must now be redesigned to facilitate rather than discourage - these overlapping transmissions. We investigate asynchronous MPR MAC protocols, which successfully accomplish this by controlling the node behavior based on the number of ongoing transmissions in the channel. The protocols use the backoff timer mechanism of the distributed coordination function, which makes them practically appealing. We first highlight a unique problem of acknowledgment delays, which arises in asynchronous MPR, and investigate a solution that modifies the medium access rules to reduce these delays and increase system throughput in the single receiver scenario. We develop a general renewal-theoretic fixed-point analysis that leads to expressions for the saturation throughput, packet dropping probability, and average head-of-line packet delay. We also model and analyze the practical scenario in which nodes may incorrectly estimate the number of ongoing transmissions.

Item Type:	Journal Article
Publication:	IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS
Publisher:	IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Additional Information:	Copyright of this article is belongs IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Keywords:	Cross-layer design; medium access control; multi-packet reception; wireless local area network; IEEE 802.11; fixed-point analysis; timer backoff
Department/Centre:	Division of Electrical Sciences > Electrical Communication Engineering
Date Deposited:	09 Sep 2013 10:21
Last Modified:	09 Sep 2013 10:21
URI:	http://eprints.iisc.ac.in/id/eprint/47077

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