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[10] Alexander Klein. Bps-mac: Backoff preamble based mac protocol with sequential contention resolution. In *Proceedings of the 4th International Conference on Multiple Access Communications*, MACOM'11, pages 39–50, Berlin, Heidelberg, 2011. Springer-Verlag.

22 Will-be-set-by-IN-TECH

160 Wireless Sensor Networks – Technology and Protocols Preamble-Based Medium Access

node density and event-driven data traffic. The results have shown that preamble sampling protocols usually have a higher delay compared to their CSMA-based counterparts. However, the preamble sampling protocols can be optimized and configured such that they achieve a higher reliability. Sensor nodes are usually very restricted in terms of memory which increases the probability of buffer overflows that lead to loss of information. This issue can be mitigated by setting the SFD flag of preambles to invalid if no information has to be stored in it.

The author would like to thank Christian Sternecker, Lothar Braun and Tsvetko Tsvetkov for many fruitful discussions regarding the implementation and Quality of Service extension of the BPS-MAC protocol. Furthermore, the author is very thankful for the support of Prof. Carle, the head of the Chair for Network Architectures and Services at the Technical University

*Network Architectures and Services - Institute for Informatics, Technical University Munich, 85748*

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**Routing Protocols** 

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[25] C. C. Enz, A. El-Hoiydi, J.-D. Decotignie, and V. Peiris. WiseNET: An ultralow-power

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[35] Pablo Brenner. The importance of the tx-rx switching time on the mac protocol, 1993. [36] Wim Diepstraten. The importance of short rx-tx turnaround time, September 1993. [37] G. Chalhoub, N. Hadid, A. Guitton, and M. Misson. Deference mechanisms significantly increase the MAC delay of slotted CSMA/CA. In *ICC*, pages 1–5, June 2009. [38] A. Koubaa, M. Alves, and E. Tovar. A comprehensive simulation study of slotted CSMA/CA for IEEE 802.15.4 wireless sensor networks. In *IEEE International Workshop*

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[41] Chipcon. Chipcon SmartRF CC2520 datasheet rev. 1.3, http://www.ti.com/, 2007. [42] Atmel. AT86RF231 datasheet rev. b, http://www.atmel.com, February 2009.

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[44] I. Ramachandran and S. Roy. WLC46-2: On the impact of clear channel assessment on MAC performance. In *Proc. IEEE Global Telecommunications Conference GLOBECOM '06*,

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*on Factory Communication Systems (WFCS)*, pages 1–10, July 2006.

*2007 Workshop on Electromagnetic Compatibility*, June 2007.

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RFC 2475, 1998.

2006.

pages 1–5, November 2006.

An Overview. RFC 1663, June 1994.

*Symp. IGARSS 2008*, volume 5, 2008.

opnet.com/services/university/, May 2010.

volume 1, pages 375–381, October 2003.

*Commun. Rev.*, 36(2):33–36, 2006.

### **Chapter 0 Chapter 8**
