Wireless Sensor Networks (WSN) has seen almost a decade of active research. The concept of Wireless Multimedia Sensor Networks has been derived from WSN where the focus has shifted from low data rate random infrequent transmissions to high data rate regular transmissions in the network. In order to support multimedia transport like voice streaming in this highly constrained network, the protocols need to be optimized for the channel throughput and lifetime of the network required by the streaming application. The medium access control (MAC) protocol plays an important role in the operation of this network to avoid collisions and allocate the optimum throughput to nodes in the streaming path. A MAC protocol for a streaming voice application is proposed in this paper which allows streaming at maximum data rate in a multihop path by adapting the frame time and avoiding the collisions to the streaming nodes by the neighboring nodes. The simulation results establish the possibility of compressed voice streaming across a large distance through multihop route.

1. T.Nieberg, S.Dulman, P.Havinga, L.van Hoesel and J.Wu, “Collaborative Algorithms for Communication in Wireless Sensor Networks”, Ambient Intelligence: Impact on Embedded Systems, Kluwer Academic Publishers, ISBN 1-4020-7668-1, November 2003.
2. Van Hoesel, L., Havinga, P.: A lightweight medium access protocol (LMAC) for wireless sensor networks. In: Proc. of the 1st Int. Workshop on Networked Sensing Systems (INSS 2004), Tokyo, Japan (2004).
3. Sudheer Kumar NV, BK Joshi, Single-path Streaming Optimized Routing Protocol for Dense Wireless Sensor Networks, IJANA, 2010.(Submitted).
4. S. Chatterjea AND L. van Hoesel AND P. Havinga AI-LMAC: An Adaptive, Information-centric and Lightweight MAC Protocol for Wireless Sensor Networks, 2nd Int. Conf. on Intelligent Sensors, Sensor Networks and Information Processing, 2004.
5. G.P. Halkes and K.G. Langendoen, Crankshaft: An Energy-Efficient MAC-Protocol for Dense Wireless Sensor Networks, European Workshop on Wireless Sensor Networks, 2007, 228-244.
6. Zheng, T., Radhakrishnan, S., Sarangan, V.: PMAC: an adaptive energy-efficient MAC protocol for wireless sensor networks. In: Proc. of the 19th IEEE Int. Parallel and Distributed Processing Symp. (IPDPS’05). (2005) 65–72.
7. http://standards.ieee.org/getieee802/download/802.15.4a-2007.pdf.
8. W.Drytkiewicz, S.Sroka, V.Handziski, A.Koepke, H.Karl, A Moibility Framework for OMNeT++, 3rd International OMNeT++ Workshop, January 2003.
9. A. Varga, The OMNeT++ discrete event simulation system, In Proc. of the European Simulation Multiconference (ESM 2001), Prague, Czech Republic, June 2001.
10. L.Nachman, J.Huang, J.Shahabdeen, R.Adler, R.Kling, IMOTE2: Serious Computation at the Edge, IWCMC international, 1118-1123, 2008.

Medium Access Control MAC real-time Streaming WSN Wireless Sensor Networks