Relay-assisted transmission could effectively enhance the performance of Device-to-Device(D2D)communications when D2D user equipments(UEs)are too far away from each other or the quality of D2D channel is not good enou...Relay-assisted transmission could effectively enhance the performance of Device-to-Device(D2D)communications when D2D user equipments(UEs)are too far away from each other or the quality of D2D channel is not good enough for direct communications.Meanwhile,security is one of the major concerns for proximity services.The secure relay selection problem for D2D communications underlaying cellular network is studied in this paper.Firstly,we define a relay selection area and derive the closed-form of outage probability in D2D links using a Poisson Point Process(PPP)method.Next,in the defined relay selection area,we propose a secure relay selection scheme for the relay-assisted D2D communication system by exploiting the social relation as a security factor.Simulation results show that the scheme based on social relation can greatly improve the security performance of relay-assisted D2D communications.展开更多
The coexistence of wireless body sensor networks(WBSNs) is a very challenging problem, due to strong interference, which seriously affects energy consumption and spectral reuse. The energy efficiency and spectral effi...The coexistence of wireless body sensor networks(WBSNs) is a very challenging problem, due to strong interference, which seriously affects energy consumption and spectral reuse. The energy efficiency and spectral efficiency are two key performance evaluation metrics for wireless communication networks. In this paper, the fundamental tradeoff between energy efficiency and area spectral efficiency of WBSNs is first investigated under the Poisson point process(PPP) model and Matern hard-core point process(HCPP) model using stochastic geometry. The circuit power consumption is taken into consideration in energy efficiency calculation. The tradeoff judgement coefficient is developed and is shown to serve as a promising complementary measure. In addition, this paper proposes a new nearest neighbour distance power control strategy to improve energy efficiency. We show that there exists an optimal transmit power highly dependant on the density of WBSNs and the nearest neighbour distance. Some important properties are also addressed in the analysis of coexisting WBSNs based on the IEEE 802.15.4 standard, such as the impact of intensity nodes distribution,optimal guard zone, and outage probability. Simulation results show that the proposed power control design can reduce the outage probability and enhance energy efficiency. Energy efficiency and area spectral efficiency of the HCPP model are better than those of the PPP model. In addition, the optimal density of WBSNs coexistence is obtained.展开更多
基金This work is supported by the National Natural Science Foundation of China under Grant No.61371188and the National Key R&D Plan under Grant No.2017YFC0803403.
文摘Relay-assisted transmission could effectively enhance the performance of Device-to-Device(D2D)communications when D2D user equipments(UEs)are too far away from each other or the quality of D2D channel is not good enough for direct communications.Meanwhile,security is one of the major concerns for proximity services.The secure relay selection problem for D2D communications underlaying cellular network is studied in this paper.Firstly,we define a relay selection area and derive the closed-form of outage probability in D2D links using a Poisson Point Process(PPP)method.Next,in the defined relay selection area,we propose a secure relay selection scheme for the relay-assisted D2D communication system by exploiting the social relation as a security factor.Simulation results show that the scheme based on social relation can greatly improve the security performance of relay-assisted D2D communications.
基金supported by EPSRC TOUCAN Project (Grant No. EP/L020009/1)EU FP7 QUICK Project (Grant No. PIRSES-GA-2013-612652)+3 种基金EU H2020 ITN 5G Wireless Project (Grant No. 641985)National Natural Science Foundation of China (Grant Nos. 61210002, 61401256)MOST 863 Project in 5G (Grant No. 2014AA01A701)International S&T Cooperation Program of China (Grant No. 2014DFA11640)
文摘The coexistence of wireless body sensor networks(WBSNs) is a very challenging problem, due to strong interference, which seriously affects energy consumption and spectral reuse. The energy efficiency and spectral efficiency are two key performance evaluation metrics for wireless communication networks. In this paper, the fundamental tradeoff between energy efficiency and area spectral efficiency of WBSNs is first investigated under the Poisson point process(PPP) model and Matern hard-core point process(HCPP) model using stochastic geometry. The circuit power consumption is taken into consideration in energy efficiency calculation. The tradeoff judgement coefficient is developed and is shown to serve as a promising complementary measure. In addition, this paper proposes a new nearest neighbour distance power control strategy to improve energy efficiency. We show that there exists an optimal transmit power highly dependant on the density of WBSNs and the nearest neighbour distance. Some important properties are also addressed in the analysis of coexisting WBSNs based on the IEEE 802.15.4 standard, such as the impact of intensity nodes distribution,optimal guard zone, and outage probability. Simulation results show that the proposed power control design can reduce the outage probability and enhance energy efficiency. Energy efficiency and area spectral efficiency of the HCPP model are better than those of the PPP model. In addition, the optimal density of WBSNs coexistence is obtained.
