دانلود رایگان مقاله انگلیسی طرح استقرار رله همراه انرژی کارآمد برای شبکه های رله سلولی - نشریه الزویر

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t In this paper, an efficient mobile relay deployment scheme to select the deployment sites for mobile relay stations (MRSs) from the candidate positions is proposed, aiming at maximizing energy efficiency (EE) while guaranteeing the spectral efficiency (SE) requirement and the coverage constraints of mobile users (MUs). Firstly, an interference graph construction method is proposed to calculate the interference at MUs served by MRSs. Then, the deployment scheme at each observation time is proposed and our framework consists of three main algorithms. The first algorithm based on the extended Hungarian deployment algorithm is proposed to find the optimal solution, i.e., minimum movement distance. In addition, a greedy deployment algorithm and a static deployment algorithm are proposed to compare with the extended Hungarian deployment algorithm. Furthermore, we compare the performance of these algorithms via simulations and analyze the impact of various parameters on the performance. Simulation results demonstrate that the extended Hungarian deployment algorithm can considerably improve system EE compared to the other two algorithms. Moreover, relay switching occurs more frequently and average relay service time reduces with the increase of maximum speed of MUs.

6. Conclusion

In this paper, the impact of MRS deployment on the performance of a cellular relay network is studied. Specifically, the EEmaximizing MRS deployment problem at each observation time is mathematically formulated. Considering the coverage constraints of MUs and the SE requirement, we first calculate the interference at MUs served by MRSs based on the IGC method, and then propose three deployment algorithms to maximize the EE, i.e., to minimize the total movement distance. The complexity of the three deployment algorithms is analyzed. Then, the impact of the number of candidate positions of MRSs and the SINR threshold on the performance are investigated. The effect of maximum MU speed on average relay switching rate and average relay service time are also discussed. Simulation results demonstrate the superior performance of EHDA in terms of the total movement distance as well as the system EE. In addition, higher maximum MU speed will lead to higher average relay switching rate and shorter average relay service time.