As shown in Fig. 8, the number of forwardings of multi-copy scheme exceeds that of the single-copy scheme.
However, it achieves much better performance than the single-copy scheme.
If the storage occupancy is low throughout the network, MultiKnap-MC can have more forwardings than the single-copy scheme.
First, it starts with a multiple-copy scheme, spreading a limited number of bundle copies, in order to exploit alternative paths.
The new target, triAM1(Gly)2 (10), thus contained all the elements of triAM1 (7), with the addition of diglycine spacers between the adamantane scaffold and the three hapten copies (Scheme 2).
We propose a single-copy routing scheme, as opposed to multi-copy schemes such as epidemic routing or spray-and-wait.
Chemical copying schemes may be seen in conjunction with "surface-promoted replication and exponential amplification of DNA analogues" (SPREAD) [5].
This solution creates a hybrid strategy, combining the advantages of single-copy schemes with some of the performance improvements made possible by multi-copy ones.
It reduces the number of transmissions with respect to epidemic routing and achieves a better delivery ratio than single-copy schemes.
This paper proposes a VDTN routing protocol, called GeoSpray, which takes routing decisions based on geographical location data, and combines a hybrid approach between multiple-copy and single-copy schemes.
It is obvious that SoRoute has the best performance among the three single-copy schemes.Finally, the overhead ratio is illustrated in Figure 16; it can be seen from the figure that SoRoute has quite a low overhead.
