The overriding purpose of this research work is to address network sustainability, a key design issue for energy-constrained wireless networks and to reduce the share of wireless in the global carbon footprint brought about by the growing popularity of wireless applications. Simple broadcast protocols with ‘user-defined’ Transmission Thresholds that are based on a form of cooperative transmission called the Opportunistic Large Array (OLA), namely, OLA with Transmission Threshold (OLA-T) and Alternating OLA-T (A-OLA-T) are key contributions of this research. The use of transmission thresholds is an important foundation for future research in wireless sensor networks that do cooperative transmission.
Some Key Results:
(a) Broadcast using Basic OLA, (b) Broadcast using OLA with Transmission Threshold (OLA-T). Only nodes in the grey areas relay.)
The grey strips represent the transmitting nodes (that form the OLA), which alternate during each broadcast.)
 Y. W. Hong and A. Scaglione, “Energy-efficient broadcasting with cooperative transmissions in wireless sensor networks,” IEEE Trans. Wireless Commun., vol. 5, no. 10, pp. 2844-55, Oct. 2006.
 A. Kailas, L. Thanayankizil, and M. A. Ingram, “A simple cooperative transmission protocol for energy-efficient broadcasting over multi-hop wireless networks,” KICS/IEEE Journal of Communications and Networks (Special Issue on Wireless Cooperative Transmission and Its Applications), vol. 10, no. 2, pp. 213-220, June 2008.
 A. Kailas and M. A. Ingram, “Alternating opportunistic large arrays in broadcasting for network lifetime extension,” IEEE Transactions on Wireless Communications, vol. 6, no. 8, pp. 2831-2835, June 2009.
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