A novel Piggyback Scheme to Improve the Performance Of MAC Layer Based on IEEE802.11n

Abstract

Our scheme is to improve the performance of MAC layer based on IEEE802.11n, when the data transferring in reverse direction from side A to side B, side B does not need to send only ACK, it can be wait for a time and send a piggyback data frame (ACK+data) and the ACK get a free ride. In this paper we propose bidirectional frame incorporated in to the aggregation with fragment retransmission (AFR). The Packets from the upper layer can be done with the help of AFR. Packets that exceed the size threshold are divided into fragments. The MAC layer then transmits the large frame and only retransmits corrupted fragments. The piggyback frame is also the same, but with the ACK and make sure to put the ACK in the first fragment. We have implemented this scheme in the NS-2.27 cygwin simulator to show the results for TCP and HDTV traffic.