A CSMA/CD compatible MAC for real-time transmissions based on varying collision intervals |
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| Affiliation: | 1. Department of Mathematics, University of Haifa, 31905 Haifa, Israel;2. Network Tech. Department, HP Labs, Bristol, UK;1. Department of Physiology and Pathophysiology, Peking University Health Science Center, Peking, China;2. Institute of Vascular Medicine and Li Ka Shing Institute of Health Sciences, Chinese University of Hong Kong, Hong Kong, China;1. Tokyo Research Park, Kyowa Hakko Kirin Co., Ltd., Machida-shi, Tokyo 194-8533, Japan;2. Department of Molecular Medicine, Research Institute for Frontier Medicine, Sapporo Medical University School of Medicine, Sapporo, Hokkaido 060-8556, Japan;3. Department of Biomedical Engineering, Toyo University, Kawagoe, Saitama 350-8585, Japan;4. Department of Cell Biological Science, Faculty of Advanced Life Science, Graduate School of Life Science, Hokkaido University, Sapporo, Hokkaido 001-0021, Japan;5. Fuji Research Park, Kyowa Hakko Kirin Co., Ltd., Nagaizumi-cho, Sunto-gun, Shizuoka 441-8731, Japan;6. Laboratory of Oncology, School of Life Science, Tokyo University of Pharmacy and Life Science, Hachioji, Tokyo 192-0392, Japan;1. Graduate School of Fisheries Science and Environmental Studies, Nagasaki University, Nagasaki 852-8521, Japan;2. College of Food and Biological Engineering, Jimei University, Xiamen, Fujian Province 361021, China;3. Research and Development Division, Hayashikane Sangyo Co., Ltd., Shimonoseki, Yamaguchi 750-8608, Japan;4. Jeju Center, Korea Basic Science Institute (KBSI), Jeju 690-756, Republic of Korea;5. Korea University of Science & Technology, Daejeon 305-350, Republic of Korea;1. Department of Endocrinology, First Affiliated Hospital of Liaoning Medical University, Jinzhou, Liaoning, China;2. Department of Immunology, Liaoning Medical University, Jinzhou, Liaoning, China;3. Department of Neurobiology, Liaoning Medical University, Jinzhou, Liaoning, China;4. Department of Physiology, Liaoning Medical University, Jinzhou, Liaoning, China;5. Department of Orthopedics, First Affiliated Hospital of Liaoning Medical University, Jinzhou, Liaoning, China;6. Department of Physiology and Pathophysiology, Peking University Diabetes Center, Peking University Health Science Center, Beijing, China;7. Shenzhen University Diabetes Center, Shenzhen University Health Science Center, Shenzhen, China;1. Department of Ophthalmology, The First Affiliated Hospital of Nanchang University, Jiangxi Province Clinical Ophthalmology Institute, No.17 Yongwaizheng Street, Donghu District, Nanchang 330006, Jiangxi Province, China;2. Department of Endocrinology and Metabolism, The Third Hospital of Nanchang, Nanchang Key Laboratory of Diabetes, No.1 Qianjing Road, Xihu District, Nanchang 330009, Jiangxi Province, China;3. Department of Medical Genetics, College of Basic Medical Science of Nanchang University, No.461 Bayi Road, Donghu District, Nanchang 330006, Jiangxi Province, China;1. Department of Cardiology, Qilu Hospital, Shandong University, Jinan, 250012, Shandong, China;2. The Key Laboratory of Cardiovascular Remodeling and Function Research, Chinese Ministry of Education and Chinese Ministry of Health, Shandong University, Jinan, 250012, Shandong, China |
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| Abstract: | This paper suggests a CSMA/CD compatible MAC protocol for real-time transmissions in a shared Home or Small Office Local Area Network. The new MAC is based on the distributed assignment of special TAG numbers to the stations transmitting real-time traffic. These TAG numbers determine a Round Robin order of transmissions among the real-time stations. They also help in resolving collisions among real time stations by setting the length of the Jam signal, transmitted in case of a collision, to be a function of the TAG number. In a collision the station with the highest TAG number, and so with the longest Jam, is persisting with its Jam transmission for the longest until all the other stations defer. Thus, the collision terminates and the longest persisting station can transmit its packet successfully. The new protocol enables stations implementing the IEEE 802.3 MAC standard to transmit on the same network with stations implementing the new protocol. After introducing the protocol, we compute an upper bound on the access delay that the protocol guarantees and prove the correctness of the distributed TAG assignment procedure. Finally, we simulate the protocol in a network consisting stations implementing the new protocol together with stations implementing the standard IEEE 802.3 MAC. We show that the access delays of the stations transmitting real-time traffic are indeed bounded as predicted. |
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