RDBFRomualdo Del Bianco Foundation (natural resources management; Florence, Italy)
RDBFReceive Data Buffer Full (computing)
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References in periodicals archive ?
RDBF always selects proper candidate forwarders in an approximate spherical segment region.
The Transmission Efficiency of RDBF. We denote the density of the sensor nodes as [d.sub.n] nodes/[m.sup.3]; the number of the candidate forwarders in the candidate region can be estimated as [n.sub.c] = [Vd.sub.n].
The RDBF transmits data packets in a hop-by-hop model and it always sends packets to the farthest downstream neighbor node.
Because RDBF introduces a priority mechanism, the candidate node with the highest priority level can send the received packets first.
Using the equations defined above, we can estimate the packet delivery ratio (PDR) of the RDBF protocol.
RDBF is a multihop forwarding routing protocol, according to the different hop counts to the sink, underwater nodes can be approximately divided into several round layers centered to the sink.
As mentioned earlier, the distances of the forwarders to the sink are the shortest and the hop count of routing paths consisted by these beneficial nodes are minimum, which is the main contribution of the RDBF. In a word, RDBF always tries to forward packets to the sink as far as possible in each hop, which can distinctly reduce the total energy consumption of the underwater wireless networks.
In the next section, we conduct a series of experiments to evaluate the performance of the RDBF protocol.
In this section, we evaluate the performance of our proposed RDBF protocol through extensive simulations in Aqua-Sim [16] which is an NS-2 based simulator.
The fitness factor of RDBF is fixed as 0.5, while the desirableness factor and radius of VBF are set as 1.0 and 20 m, respectively.
When there are only 500 nodes in the network, the PDR of VBF is below 0.45 and the PDR of RDBF is over 0.55.
The average end-to-end delay of RDBF is distinctly shorter than that of the VBF, which is shown in Figure 5.