{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,12]],"date-time":"2025-10-12T04:39:43Z","timestamp":1760243983222,"version":"build-2065373602"},"reference-count":37,"publisher":"MDPI AG","issue":"6","license":[{"start":{"date-parts":[[2009,6,18]],"date-time":"2009-06-18T00:00:00Z","timestamp":1245283200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/3.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>We study the problem of how to alleviate the exposed terminal effect in multihop wireless networks in the presence of log-normal shadowing channels. Assuming node location information, we propose an extension of the IEEE 802.11 MAC protocol that schedules concurrent transmissions in the presence of log-normal shadowing, thus mitigating the exposed terminal problem and improving network throughput and delay performance. We observe considerable improvements in throughput and delay achieved over the IEEE 802.11 MAC under various network topologies and channel conditions in ns-2 simulations, which justify the importance of considering channel randomness in MAC protocol design for multihop wireless networks.<\/jats:p>","DOI":"10.3390\/s90604824","type":"journal-article","created":{"date-parts":[[2009,6,18]],"date-time":"2009-06-18T13:37:28Z","timestamp":1245332248000},"page":"4824-4844","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":6,"title":["Medium Access Control for Opportunistic Concurrent Transmissions under Shadowing Channels"],"prefix":"10.3390","volume":"9","author":[{"given":"In Keun","family":"Son","sequence":"first","affiliation":[{"name":"Department of Electrical and Computer Engineering, Auburn University, Auburn, AL 36849, USA"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7052-0007","authenticated-orcid":false,"given":"Shiwen","family":"Mao","sequence":"additional","affiliation":[{"name":"Department of Electrical and Computer Engineering, Auburn University, Auburn, AL 36849, USA"}]},{"given":"Seung Min","family":"Hur","sequence":"additional","affiliation":[{"name":"Center for u-Manufacturing, Pohang University of Science and Technology, Pohang, Korea"}]}],"member":"1968","published-online":{"date-parts":[[2009,6,18]]},"reference":[{"key":"ref_1","unstructured":"(1999). Wireless LAN Media Access Control (MAC) and Physical Layer (PHY) Specifications. IEEE."},{"key":"ref_2","doi-asserted-by":"crossref","unstructured":"Li, J., Blake, C., Couto, D., Lee, H.I., and Morris, R. (2001). Capacity of Ad Hoc Wireless Networks. Proc. ACM MobiCom'01, 61\u201369.","DOI":"10.1145\/381677.381684"},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"2182","DOI":"10.1109\/TWC.2005.853875","article-title":"IEEE 802.11 Performance Enhancement via Concatenation and Piggyback Mechanisms","volume":"5","author":"Xiao","year":"2005","journal-title":"IEEE Trans. Wireless Commun."},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"4635","DOI":"10.1109\/T-WC.2008.070666","article-title":"On the Performance of Distributed Polling Service-based Wireless MAC Protocols","volume":"7","author":"Li","year":"2008","journal-title":"IEEE Trans. Wireless Commun."},{"key":"ref_5","unstructured":"Park, J.-S., Nandan, A., Gerla, M., and Lee, H. (2005). Proc. IEEE ICC'05."},{"key":"ref_6","unstructured":"Wang, Y., and Garcia-Luna-Aceves, J. (2002). Proc. IEEE GLOBECOM'02."},{"key":"ref_7","unstructured":"Deng, J., Liang, B., and Varshney, P. (2004). Proc. IEEE GLOBECOM'04."},{"key":"ref_8","unstructured":"Yang, X., and Vaidya, N. (2005). Proc. IEEE INFOCOM'05."},{"key":"ref_9","unstructured":"Zhai, H., and Fang, Y. (2006). Proc. IEEE INFOCOM'06."},{"key":"ref_10","unstructured":"Monks, J., Bharghavan, V., and Hwu, W.-M. (2001). Proc. IEEE INFOCOM'01."},{"key":"ref_11","unstructured":"den Heuvel-Romaszko, S.V., and Blondia, C. (2005). Proc. ACM MobiCom'05."},{"key":"ref_12","unstructured":"Zhou, Y., and Nettles, S. (2005). Proc. IEEE WCNC'05."},{"key":"ref_13","unstructured":"Acharya, A., Misra, A., and Bansal, S. (2003). Proc. IEEE Pervasive Computing and Communications (PerCom'03)."},{"key":"ref_14","unstructured":"Mittal, K., and Belding, E. (2006). Proc. IEEE Workshop on Wireless Mesh Networks (WiMesh'06)."},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"314","DOI":"10.1109\/TVT.2008.924972","article-title":"Exploiting Location Information for Concurrent Transmissions in Multihop Wireless Networks","volume":"58","author":"Hur","year":"2009","journal-title":"IEEE Trans. Veh. Commun."},{"key":"ref_16","unstructured":"Rappaport, T. (2001). Wireless Communications: Principles and Practice., Prentice Hall PTR. [2nd ed.]."},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"128","DOI":"10.1109\/MCOM.2002.1018018","article-title":"Position Based Routing in Ad Hoc Networks","volume":"40","author":"Stojmenovic","year":"2002","journal-title":"IEEE Commun. Mag."},{"key":"ref_18","unstructured":"Chen, M., Leung, V., Mao, S., Xiao, Y., and Chlamtac, I. IEEE Trans. Veh. Technol., Accepted for publication."},{"key":"ref_19","doi-asserted-by":"crossref","unstructured":"Mao, G., and Fidan, B. (2009). Localization Algorithms and Strategies for Wireless Sensor Networks, IGI Global.","DOI":"10.4018\/978-1-60566-396-8"},{"key":"ref_20","unstructured":"Ye, F., Yi, S., and Sikdar, B. (2003). Proc. IEEE GLOBECOM'03."},{"key":"ref_21","unstructured":"Zhu, J., Guo, X., Yang, L., and Conner, W. (2004). Proc. IEEE ICC'04."},{"key":"ref_22","unstructured":"Cesana, M., Maniezzo, D., Bergamo, P., and Gerla, M. (2003). Proc. IEEE VTC Fall-2003."},{"key":"ref_23","unstructured":"Yeh, C.-H., and The, Heterogeneous (2004). Proc. IEEE VTC Fall-2004."},{"key":"ref_24","unstructured":"Shukla, D., Chandran-Wadia, L., and Iyer, S. (2003). Proc. IEEE ICCCN'03."},{"key":"ref_25","doi-asserted-by":"crossref","first-page":"975","DOI":"10.1109\/TCOMM.2002.1010617","article-title":"Dual Busy Tone Multiple Access (DBTMA)-a Multiple Access Control Scheme for Ad Hoc Networks","volume":"50","author":"Haas","year":"2002","journal-title":"IEEE Trans. Commun."},{"key":"ref_26","unstructured":"Takata, M., Bandai, M., and Watanabe, T. (, January Jun.). An Extended Directional MAC for Location Information Staleness in Ad Hoc Networks. Toronto, Canada."},{"key":"ref_27","doi-asserted-by":"crossref","unstructured":"Woo, A., and Culler, D. (2001). A Transmission Control Scheme for Media Access in Sensor Networks. Proc. ACMMobiCom'01, 221\u2013235.","DOI":"10.1145\/381677.381699"},{"key":"ref_28","unstructured":"Shukla, D., Chandran-Wadia, L., and Iyer, S. (2003). Proc. IEEE ICCCN'03."},{"key":"ref_29","unstructured":"Miorandi, D., and Altman, E. (2005). Proc. IEEE INFOCOM'05."},{"key":"ref_30","doi-asserted-by":"crossref","first-page":"351","DOI":"10.1007\/s11036-006-5188-7","article-title":"Connectivity in Wireless Ad-hoc Networks with a Log-normal Radio Model","volume":"11","author":"Hekmat","year":"2006","journal-title":"Mob. New. Appl."},{"key":"ref_31","doi-asserted-by":"crossref","unstructured":"Zhang, Y., Luo, J., and Hu, H. (2006). Wireless Mesh Networking: Architectures, Protocols and Standards., Auerbach Publications. [1st ed.].","DOI":"10.1201\/9781420013542"},{"key":"ref_32","unstructured":"Kotz, D., Newport, C., Gray, R., Liu, J., Yuan, Y., and Elliott, C. (, January Oct). Experimental Evaluation of Wireless Simulation Assumptions. Venice, Italy."},{"key":"ref_33","unstructured":"The Network Simulator: ns-2. Available online: http:\/\/isi.edu\/nsnam\/ns\/."},{"key":"ref_34","doi-asserted-by":"crossref","first-page":"57","DOI":"10.1109\/TCOM.1960.1097606","article-title":"The sum of Log-normal Probability Distributions in Scatter Transmission Systems","volume":"8","author":"Fenton","year":"1960","journal-title":"IRE Trans. Commun. Syst."},{"key":"ref_35","doi-asserted-by":"crossref","first-page":"441","DOI":"10.1061\/(ASCE)1084-0699(2002)7:6(441)","article-title":"Near Lognormal Distribution","volume":"7","author":"Swamee","year":"2002","journal-title":"J. Hydrologic Eng."},{"key":"ref_36","unstructured":"Neter, J., Kutner, M., Nachtsheim, C., and Wasserman, W. (1996). Applied Linear Statistical Models, McGraw-Hill\/Irwin. [4th ed.]."},{"key":"ref_37","doi-asserted-by":"crossref","unstructured":"Perkins, C., Belding-Royer, E., and Das, S. (2003). Ad Hoc On Demand Distance Vector (AODV) Routing, IETF RFC 3561.","DOI":"10.17487\/rfc3561"}],"container-title":["Sensors"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/1424-8220\/9\/6\/4824\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,11]],"date-time":"2025-10-11T22:10:36Z","timestamp":1760220636000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/1424-8220\/9\/6\/4824"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2009,6,18]]},"references-count":37,"journal-issue":{"issue":"6","published-online":{"date-parts":[[2009,6]]}},"alternative-id":["s90604824"],"URL":"https:\/\/doi.org\/10.3390\/s90604824","relation":{},"ISSN":["1424-8220"],"issn-type":[{"type":"electronic","value":"1424-8220"}],"subject":[],"published":{"date-parts":[[2009,6,18]]}}}