naa a22 4500 510797865 CHVBK 20180411083343.0 cr unu---uuuuu 180411e20130901xx s 000 0 eng 10.1007/s11277-013-0998-y doi (NATIONALLICENCE)springer-10.1007/s11277-013-0998-y CLACK: Cross-layer ACK-Aided Opportunistic Transmission in Wireless Networks [Elektronische Daten] [Suchul Lee, Jiwoong Jeong, Taemin Park, Jun-Rak Lee, Chong-kwon Kim] Wi-Fi has gained tremendous attention from the research community, yielding successful technological advancements. However, the data throughput efficiency (the ratio of application throughput to the maximum achievable physical data rate) degrades rapidly as the PHY data rate increases when using the current 802.11 medium access control (MAC) protocol. To address this MAC inefficiency, many protocols have been introduced and standardized. This paper describes and examines these state-of-the-art enhancements to MAC efficiency for the 802.11 standard, and proposes a CLACK (Cross-Layer ACK) method that tackles this issue in totally different manner to those previous schemes. The main idea is simple: When a receiver sends an ACK, it transmits the data using the ACK transmission opportunity, and avoids channel contention necessary for data transmissions. The receiver's short signature is piggybacked in the PHY instead of the MAC to acknowledge the packet reception. We have implemented CLACK using USRP toolkits and GNU Software Define Radio. Our implementation demonstrates the feasibility of our key techniques for both PHY and MAC design. Further, we use detailed simulation to evaluate CLACK in general wireless environments under different traffic loads and varying channel conditions. Our results show that CLACK gains up to 52% in terms of throughput, when compared to the basic 802.11 scheme, and up to 18% when compared to existing advanced 802.11e/n schemes. Springer Science+Business Media New York, 2013 IEEE 802.11 nationallicence Wi-Fi nationallicence Piggyback nationallicence Cross-layer ACK nationallicence Fairness nationallicence Performance nationallicence Implementation nationallicence Lee Suchul Department of CSE, Seoul National University, Seoul, South Korea aut Jeong Jiwoong Samsung Electronics, Suwon-si, Republic of Korea aut Park Taemin Korea Telecom, Seoul, South Korea aut Lee Jun-Rak Kangwon National University, Chuncheon, South Korea aut Kim Chong-kwon Department of CSE, Seoul National University, Seoul, South Korea aut Wireless Personal Communications Springer US; http://www.springer-ny.com 72/1(2013-09-01), 15-34 0929-6212 72:1<15 2013 72 11277 https://doi.org/10.1007/s11277-013-0998-y text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11277-013-0998-y text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Lee Suchul Department of CSE, Seoul National University, Seoul, South Korea aut NATIONALLICENCE 700 1- Jeong Jiwoong Samsung Electronics, Suwon-si, Republic of Korea aut NATIONALLICENCE 700 1- Park Taemin Korea Telecom, Seoul, South Korea aut NATIONALLICENCE 700 1- Lee Jun-Rak Kangwon National University, Chuncheon, South Korea aut NATIONALLICENCE 700 1- Kim Chong-kwon Department of CSE, Seoul National University, Seoul, South Korea aut NATIONALLICENCE 773 0- Wireless Personal Communications Springer US; http://www.springer-ny.com 72/1(2013-09-01), 15-34 0929-6212 72:1<15 2013 72 11277 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer