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This paper investigates the network function virtualization (NFV)-enabled multicast problem, and proposes a steiner tree-based algorithm to reduce the cost of virtual network function (VNF) deployment and routing. In the algorithm, to minimize the bandwidth consumption, the Steiner tree is constructed by taking all the destination nodes as the terminals. Then a interconnection node of the tree is...
Wireless virtualization is an emerging solution for future wireless networks. Besides, device-to-device (D2D) communications has also gathered significant attention as another promising technology to meet the increasing demand. To merge the merits of the both, this paper addresses the virtual resource allocation with D2D communications underlaying LTE networks. By considering the cost of all the service...
The main challenge in network visualization is known as so called virtual network embedding(VNE). Most proposed VNE algorithms are heuristic so far in the literature. This paper presents an exact algorithm based on the Integer Linear Programming(ILP) of optimization theory. The exact algorithm VNE-ILP is able to simultaneously map virtual nodes and virtual links of VNRs. The constraint of virtual...
One main challenge in network virtualization is known as virtual network embedding(VNE). VNE is NP-hard and most algorithms in the literature are heuristic. This paper presents an exact algorithm based on the Integer Linear Programming(ILP). The exact algorithm aims to simultaneously minimize the cost of substrate network and average virtual link delay of mapped VNRs. Simulation results reveal that...
A new power control algorithm is proposed in a cognitive radio system with MC-CDMA. A new utility function that is formed by transmit power and SIR is applied to the algorithm and the static nash equilibrium is obtained for utility function. The nash equilibrium power in new algorithm provides substantial power saving as compared to SIR balancing algorithm and Koskie-Gajic algorithm while reducing...
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