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We exploit helper-to-helper (h-2-h) cooperation us-ing the broadcast nature of wireless sensor networks. The potential helpers overhear the packet from the transmission of previous hop and the helper transmits the packet in the current hop on behalf of the assigned node (sender). We call it friend-ship relaying cooperative medium access control (FR...
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... considered network scenario for the proposed work is shown in Fig.1. Assume that source S has a packet to be transmitted to the node C through a predefined path. ...
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... 1 retransmits to receiver B in the second phase. FRC mode is triggered in the hop BC where H 2 overhears and decodes the packet from the transmission of the previous hop AB and on behalf of node B transmits the packet in the current hop BC. This is an innovative single-phase cooperation mode that is introduced in this paper for the first time. In Fig. 1, H 2 overhears the packet from the transmission of either A or H 1 of the previous hop AB. Note that helper H 2 can decode the packet transmitted by A or H 1 if they lie in each other's transmission ...
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... proposed protocol is adaptive and the transmission mode depends on the link quality and availability of helper subsets. Suppose as in Fig.1, node S has a data packet to be sent to C through forwarding nodes A and B. Here, link SA is better but the links AB and BC are vulnerable/poor in terms of link quality. ...
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... is obvious that in Fig. 1 the signal-to-noise ratio of RTS (SNR rts ) reduces toward node C and the signal-to-noise ratio of CTS (SNR cts ) reduces toward the node B for the hop BC. Therefore, the closer a helper is to the sender B, the stronger the SNR rts and poorer the SNR cts are. If A helper with the value of g = 0 depicts that its position is about in the ...
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... protocol activates one of two modes: direct (DRC) or cooperative transmission. We additionally classify the cooper- ative mode into two modes: TRC and FRC. In this section, we focus our discussion on the hop BC in which our proposed FRC mode activates, as shown in Fig. 1. However, for better understanding of the readers, we explain the modes DRC, TRC, and FRC for the hops SA, AB, and BC respectively. Data NAV ACK S I F S S I F S S I F ...
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... end- 2-end delay increases for all protocols because collisions increase with node densities. Figure 10 shows that FRC-MAC is more energy efficient than LC-MAC and CoopMAC. This is because the number of successful packets in the simulation period was higher Energy efficiency vs. number of deployed nodes for different protocols in FRC-MAC. ...
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