International Journal of Data Science and Analysis 2017; 3(6): 69-76 http://www.sciencepublishinggroup.com/j/ijdsa doi: 10.11648/j.ijdsa.20170306.12 ISSN: 2575-1883 (Print); ISSN: 2575-1891 (Online) Review Article Piggyback Scheme over TCP in Very High Speed Wireless LANs: Review Ali Ahmad Milad * , Saad Mohamed Lafi, Mustafa Almahdi Algaet Department of Computer, Faculty of Education, Elmergib University, Alkhums, Libya Email address: Ali106014@yahoo.com (A. A. Milad) * Corresponding author To cite this article: Ali Ahmad Milad, Saad Mohamed Lafi, Mustafa Almahdi Algaet. Piggyback Scheme over TCP in Very High Speed Wireless LANs: Review. International Journal of Data Science and Analysis. Vol. 3, No. 6, 2017, pp. 69-76. doi: 10.11648/j.ijdsa.20170306.12 Received: September 5, 2017; Accepted: October 8, 2017; Published: November 23, 2017 Abstract: When the data packets transferred in duplex directions from part A to part B, and the data arrives at B, instead to sending a control frame from B to A, receiver B waits until the network layer at B send the next packet to A, and the Acknowledgment is attached in data frame from B to A using the field of Acknowledgment in the data frame header. so the acknowledgment got a free ride in the data frame, this technique known as piggybacking. One of the most advantages for piggyback scheme is improving the efficiency, which is reducing the overhead and increase system throughput. In this paper, we want to provide an overview of a research progress in piggyback scheme over wireless LANs. The research contributions are organised and summarized and it highlights the piggyback schemes that need to be investigated via high speed wireless LANs. Keywords: Piggyback Scheme, Wireless LANs, IEEE802.11, TCP 1. Introduction TCP is a generally used protocol on the Internet designed for reliable data transfer, when the receiving side has to acknowledge some received packets, it can be wait for the next data packet to be sent and put the acknowledgement information in the header, so does not have to send a separate TCP ACK packet. Piggyback mechanism reduces overhead and improves the performance [1], [2], but still need some improvements to get good system. In wireless LANs based on IEEE 802.11 becomes increase everywhere to support many applications using TCP, UDP, HDTV, and VOIP. In very high speed wireless LANs the physical layer rate may reach up to 600Mbps to get high efficiency at MAC layer. The idea for that when increasing the physical rate causes increasing transmission at MAC link and then cause increasing the overhead [3]. See figure 1. In IEEE802.11 the throughput does not scale well with increasing the physical rate. However, in IEEE802.11n the throughput achieves 100Mbps at MAC layer. Figure 1. Increase Overhead with Increase Data Rate. To improve the performance widely, we need to figure out the main problem at MAC inefficiency, see figure 2. The theoretic throughput higher limit and a theoretic delay lower limit exist for the IEEE 802.11 protocols. The existence of