Simulation of the Impact of Packet Errors on the Kademlia Peer-to-Peer Routing.

摘要

Tactical radio communication is crucial for command and control. The progress in C2 software demands higher and higher transmission rates, more employed radios and higher robustness. Interconnectivity between various participants of a tactical network is achieved by increased usage of the Internet Protocol. Structured overlay networks, so called peer-to-peer networks can help to increase the reliability of IP-connections. The principle of peer- to-peer networks is to use a broad number of peers to transmit and retrieve messages instead of a single connection to a server. The redundancy increases its suitability for disadvantaged networks. At the time peer-to-peer networks became widespread, dial-up users with very little available bandwidth were common. This scenario is comparable to tactical scenarios where a limited number of base communication facilities and a larger number of mobile tactical radios exist. The error rate of dial-up lines and radios are both comparatively high. Tactical communication is even more supposed to be prone to errors and presumably suffers from higher packet error rates. Not all tactical user terminals are equal in capabilities such as transmission quality or battery power. It would be desirable if a peer-to-peer system respects these facts or could adapt to the situation to increase the responsiveness of such a system. This paper will describe changes made to a widespread peer-to-peer system. Measurements in a simulated environment show that the speed of the overlay network can be increased by a slight modification of the routing. We incorporate cross-layer information about the error rate and delay of a connection or remaining battery power of a node into the overlay network to improve the responsiveness or traffic distribution of an existing peer-to-peer system.