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( Zhengyu Kong ),( Duanpo Wu ),( Xinyu Jin ),( Shuwei Cen ),( Fang Dong ) 한국인터넷정보학회 2021 KSII Transactions on Internet and Information Syst Vol.15 No.4
Deployment of access point (AP) is a problem that must be considered in network planning. However, this problem is usually a NP-hard problem which is difficult to directly reach optimal solution. Thus, improved AP deployment optimization scheme based on swarm intelligence algorithm is proposed to research on this problem. First, the scheme estimates the number of APs. Second, the multi-objective particle swarm optimization (MOPSO) algorithm is used to optimize the location and transmit power of APs. Finally, the greedy algorithm is used to remove the redundant APs. Comparing with multi-objective whale swarm optimization algorithm (MOWOA), particle swarm optimization (PSO) and grey wolf optimization (GWO), the proposed deployment scheme can reduce AP's transmit power and improves energy efficiency under different numbers of users. From the experimental results, the proposed deployment scheme can reduce transmit power about 2%-7% and increase energy efficiency about 2%-25%, comparing with MOWOA. In addition, the proposed deployment scheme can reduce transmit power at most 50% and increase energy efficiency at most 200%, comparing with PSO and GWO.
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Moyan Zhang,Hong Xiao,Jiaqi Wang,Shuwei Fang,Ziqing Jiang 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.8
Excessive fastener spacing, which results from construction errors (the bridge construction error and the track layout error) and environment temperature, is a possible safety risk for train and track structure. To address this problem, this paper selected a CRTSIII ballastless track-bridge section as the engineering case, and established a thermal-mechanical trackbridge coupling model. The maximum fastener spacing was calculated based on the model, and the dynamic and static characteristics of train and track under the different fastener spacing were compared. The results show that under the combination of construction errors and ambient temperature, the most unfavorable fastener spacing is 755 mm; with the increase in fastener spacing, the longitudinal resistance of fasteners first reaches the limit in the static safety indexes; the rail vertical dynamic displacement first reaches the limit in the dynamic safety indexes. Therefore, maximum fastener spacing of CRTSIII ballastless track structure depends on railway operation and maintenance, train speed and local environment.
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Backhaul transmission scheme for UAV based on improved Nash equilibrium strategy
Lishan Liu,Duanpo Wu,Xinyu Jin,Shuwei Cen,Fang Dong 한국인터넷정보학회 2022 KSII Transactions on Internet and Information Syst Vol.16 No.8
As a new alternative communication scheme in 5G, unmanned aerial vehicle (UAV) is used as a relay in the remote base station (BS) for assistant communication. In order to ameliorate the quality of the backhaul link, a UAV backhaul transmission scheme based on improved Nash equilibrium (NE) strategy is proposed. First, the capacity of air-to-ground (A2G) channel by the link preprocess is maximized. Then, the maximum utility function of each UAV is used as the basis of obtaining NE point according to the backhaul channel and the backhaul congestion. Finally, the improved NE strategy is applied in multiple iterations until maximum utility functions of all the UAVs are reached, and the UAVs which are rejected by air-to-air (A2A) link during the process would participate in the source recovery process to construct a multi-hop backhaul network. Simulation results show that average effective backhaul rate, minimum effective backhaul rate increases by 10%, 28.5% respectively in ideal A2G channel, and 11.8%, 42.3% respectively in fading channel, comparing to pure NE strategy. And the average number of iterations is decreased by 5%.
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