By Ryan E. Blace, Mohamed Eltoweissy (auth.), Ali Miri (eds.)
International Federation for info Processing
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Extra resources for Wireless Sensor and Actor Networks II: Proceedings of the 2008 IFIP Conference on Wireless Sensor and Actor Networks (WSAN 08), Ottawa, Ontario, Canmada, July 14-15, 2008
In section 3, we introduce the OEWS for reducing overhearing energy consumption and DTS for reducing delay time. We show the simulation results in section 4. 1 Radio Model. For measuring energy consumption in a sensor network, we need an energy model. A sensor node consumes energy by transmitting, receiving and overhearing. Etx is the energy used for transmitting and Erx is the energy used for receiving. We assume the energy model including overhearing energy based on . This radio model calculates the energy spent for one bit to send over a distance ‘d’ as Etx = Etxelec + єd2 (1) Erx = Erxelec (2) Etxelec, the energy consumption by transmitter electronics, dissipates 50nJ/bit.
Moreover, each cluster-head has another table called ‘TableCH’, in which information from cluster-heads is stored. The format of this table is defined as TableCH(NodeCH, Weight). Cluster formation is performed in two consecutive phases: set-up and re-affiliation. 1 The set-up phase At the beginning of each round, each sensor calculates its weight and generates a ‘Hello’ message with two extra fields in addition to other regular contents: Weight and NodeCH, where NodeCH is set to zero. Then, it broadcasts it to its 2-hop neighborhood and eavesdrops on its neighbors' ‘Hello’ messages.
In OEWS, total energy consumption is different from S-MAC. OEWS has two kinds of energy models. One is for nodes which have an odd id number and the other is for nodes which have an even id number. Therefore, total energy consumption from node i to node j which both have odd id number (or even id number) is represented by the following: Eij = |RTS+DATA| × (єdi2+ Etxelec) + |CTS+ACK| × ( єdj2+ Etxelec) + |RTS+CTS+DATA+ACK| × Erxelec + Nodd_RTS (or Neven_RTS) × |RTS| × Erxelec + Nodd_CTS (or Neven_CTS) × | CTS| × Erxelec (5) Here, Nodd_CTS (Neven_CTS) is the number of odd (Even) id neighbors which overhear CTS and Nodd_RTS(Neven_RTS) is the number of odd (even) id neighbors which overhear RTS.
Wireless Sensor and Actor Networks II: Proceedings of the 2008 IFIP Conference on Wireless Sensor and Actor Networks (WSAN 08), Ottawa, Ontario, Canmada, July 14-15, 2008 by Ryan E. Blace, Mohamed Eltoweissy (auth.), Ali Miri (eds.)