Aigaion: RACTI / RU1 Technical Report Series (Web Based)

[RACTI-RU1-2006-59] Gkamas, V. and Varvarigos, Emmanouel, A Slow Start Power Control MAC Protocol for Mobile Ad Hoc Networks,, in: IEEE 17th International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC 2006), pages 1-6, 2006.
Abstract: We propose a MAC protocol for mobile ad hoc networks that uses power control for the RTS/CTS and DATA frame transmissions in order to improve energy and capacity utilization efficiency. Unlike IEEE 802.11, in our scheme the RTS frames are not sent using the maximum transmission power to silence neighbouring nodes, and the CTS frames do not silence all receiving nodes to the same degree. In contrast, the transmission power of the RTS frames follows a slow start principle, while the CTS frames, which are sent at maximum transmission power, prevent the neighbouring nodes from transmitting their DATA frames with power more than a computed threshold, while allowing them to transmit at power levels less than that threshold. This is done by including in the RTS and the CTS frames additional information, such as the power of the transmissions, and the interference tolerance of the nodes. Moreover the DATA frames are sent at the minimum required transmission power increased by a small margin to ensure connectivity with the intended receiver, so as to cause minimal interference to neighbouring nodes and allow for future interference to be added to the receiver of the DATA frames. The power to be used by the transmitter is computed by the recipient of the RTS frame and is included in the CTS frame. It is expected that a network with such a power management scheme would achieve a better throughput performance and more power savings than a network without such a scheme.
[RACTI-RU1-2008-45] Varvarigos, Emmanouel, Gkamas, V. and Karagiorgas, Nikos, A Slow Start Power Controlled MAC Protocol for Mobile Ad Hoc Networks and its Performance Evaluation, in: Ad Hoc Networks, 2008.
Abstract: We propose a MAC protocol for mobile ad hoc networks that uses power control for the RTS/CTS and DATA frame transmissions in order to improve energy and capacity utilization efficiency. Unlike IEEE 802.11, in our scheme the RTS frames are not sent using the maximum transmission power to silence neighbouring nodes, and the CTS frames do not silence all receiving nodes to the same degree. In contrast, the transmission power of the RTS frames follows a slow start principle, while the CTS frames, which are sent at maximum transmission power, prevent the neighbouring nodes from transmitting their DATA frames with power more than a computed threshold, while allowing them to transmit at power levels less than that threshold. This is done by including in the RTS and the CTS frames additional information, such as the power of the transmissions, and the interference tolerance of the nodes. Moreover the DATA frames are sent at the minimum required transmission power increased by a small margin to ensure connectivity with the intended receiver, so as to cause minimal interference to neighbouring nodes and allow for future interference to be added to the receiver of the DATA frames. The power to be used by the transmitter is computed by the recipient of the RTS frame and is included in the CTS frame. It is expected that a network with such a power management scheme would achieve a better throughput performance and more power savings than a network without such a scheme.
[RACTI-RU1-2004-28] Poster Proceedings of the 7th ACM MSWiM 2004, Ellinika Grammata and CTI Press, 2004.
Abstract: This Volume contains the 11 papers corresponding to poster and demo presentations accepted to the 7th ACM/IEEE International Symposium on Modeling, Analysis and Simulation ofWireless and Mobile Systems (MSWiM 04), that is held October 4-6, 2004, in Venice, Italy. MSWiM 2004 (http://www.cs.unibo.it/mswim2004/) is intended to provide an international forum for original ideas, recent results and achievements on issues and challenges related to mobile and wireless systems. A Call for Posters was announced and widely disseminated, soliciting posters that report on recent original results or on-going research in the area of wireless and mobile networks. Prospective authors were encouraged to submit interesting results on all aspects of modeling, analysis and simulation of mobile and wireless networks and systems. The scope and topics of the Posters Session were the same as those included in the MSWiM Call for Papers (see above). Poster presentations were meant to provide authors with early feedback on their research work and enable them to present their research and exchange ideas during the Symposium. All submissions to the call for posters as well as selected papers submitted to MSWiM 04 were considered and reviewed. The review process resulted in accepting the set of 11 papers included in this Volume. Accepted posters will also be on display during the Symposium. The set of papers in this Proceedings covers a wide range of important topics in wireless and mobile computing, including channel allocation in wireless networks, quality of service provisioning in IEEE 802.11 wireless LANs, IP mobility support, energy conservation, routing in mobile adhoc networks, resource sharing, wireless access to the WWW, sensor networks etc. The performance evaluation techniques used include both analysis and simulation. We hope that the poster papers included in this Volume will facilitate a fruitful and lively discussion and exchange of interesting and creative ideas during the Symposium. We wish to thank the MSWiM Steering Committee Chair Azzedine Boukerche and the Program Co-Chairs ofMSWiM 04 Carla-Fabiana Chiasserini and Lorenzo Donatiello for their valuable help in the selection procedure. Also, the MSWiM 04 Publicity Co-Chairs Luciano Bononi, Helen Karatza and Mirela Sechi Moretti Annoni Notare for disseminating the Call for Posters. We wish to warmly thank the Poster Proceedings Chair Ioannis Chatzigiannakis for carefully doing an excellent job in preparing the Volume you now hold in your hands.
[RACTI-RU1-2009-122] Varvarigos, Emmanouel, Gkamas, V. and Karagiorgas, Nikos, The slow start power controlled MAC protocol for mobile ad hoc networks and its performance analysis, in: Ad Hoc Networks, 2009.
Abstract: We propose and evaluate the performance of a new MAC-layer protocol for mobile ad hoc networks, called the Slow Start Power Controlled (abbreviated SSPC) protocol. SSPC improves on IEEE 802.11 by using power control for the RTS/CTS and DATA frame transmissions, so as to reduce energy consumption and increase network throughput and lifetime. In our scheme the transmission power used for the RTS frames is not constant, but follows a slow start principle. The CTS frames, which are sent at maximum transmission power, prevent the neighbouring nodes from transmitting their DATA frames at power levels higher than a computed threshold, while allowing them to transmit at power levels less than that threshold. Reduced energy consumption is achieved by adjusting the node transmission power to the minimum required value for reliable reception at the receiving node, while increase in network throughput is achieved by allowing more transmissions to take place simultaneously. The slow start principle used for calculating the appropriate DATA frames transmission power and the possibility of more simultaneous collision-free transmissions differentiate the SSPC protocol from the other MAC solutions proposed for IEEE 802.11. Simulation results indicate that the SSPC protocol achieves a significant reduction in power consumption, average packet delay and frequency of RTS frame collisions, and a significant increase in network throughput and received-to-sent packets ratio compared to IEEE 802.11 protocol.