Zhao Zhenmin

Using complex network theory in the Internet engineering

In the next generation network engineering research, network simulation and modelling is very important. The ongoing GNEI, FP7 plan and so on, needs to experiment and simulate the future network. Premise is that the model of network is correct. If the topology model of network is not consistent with the actual network, the conclusion is not correct. Internet network has some characteristics as Hierarchy, Power law distribution, Rich-club property, Disassortative, Self-similarity, Robust yet fragile and others. The complex network theory is a mathematical method to reveal the network scale features. Through the method to establish the network topology will have more match framework with the actual network. This paper analyzed the Waxman model and the BA model based on the distribution of power law. Simulation result shows that the scale-free network has more realistic characteristics of the Internet.

A semi-distributed power allocation for the cooperative relay in OFDMA network

In this paper we propose a semi-distributed power allocation algorithm(S-DPA) in the downlink of cellular OFDMA-relay network. This algorithm introduces non-cooperative game theory in the second time subslot for relays and TS algorithm in the first time subslot for base stations. TS algorithm can match the data rate of two-hop links for each relay. Simulation results show that compared with equal power allocation algorithm, this algorithm not only improves the average throughput, but also reduces system energy consumption.