The article analyses the possibilities and techniques of modeling global cyber-attacks on an internetwork of small countries. The authors study the Distributed Denial of Service (DDoS) attack against Estonian internetwork, which took place in 2007, in an open-source Nessi 2 simulator environment, as DDoS appears to be the most common type of informational attack on resources used todeay. Such a modeling can be replicated with a certain degree of accuracy because the most of powerful attacks have been relatively welldocumented. The article covers the most lifelike attack scenarios accomplished by sophisticated modeling of underlying traffic cases. Conclusions drawn from the simulation show that even large-scale DDoS attacks can be successfully modeled using limited resources only. Future research directions, motivated by the research, underlying this article, are highlighted at the end.

In this paper, a new flexible backhaul design is proposed based on the time-frequency resource grid. The advantage of proposed approach is in the fine granularity bandwidth allocation. Proposed approach allows tunneling of Cloud-RAN modulated radio signals between baseband processing unit and remote radio head within the same resource blocks. In addition, new handover machanism has been introduced to reduce the handover overhead in the backhaul network. The main idea of the proposed handover mechanism is in multicast data transmission to both involved eNodeBs by joint assignment of the resource elements for multiple cells during handover that allows to decrease the amount of backhaul traffic over X2 interface by 20%.

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