A Load-Balanced Re-embedding Scheme for Wireless Network Virtualization

Abstract : In wireless network virtualization processes, load imbalance in substrate nodes and substrate links may significantly reduce the number of virtual network requests served by a substrate network. In addition, load imbalance also impairs resource utilization and increases embedding cost of the virtual networks. To tackle these issues, this work proposes a re-embedding scheme for virtual node (RSVN). Based on the load condition of a substrate network, RSVN first determines whether to start re-embedding procedure or not, and then selects proper re-embedded virtual nodes according to their re-embedding factors. Next, RSVN re-embeds the selected virtual nodes to balance the loads of a wireless substrate network. The extensive simulation results showed that RSVN improves the acceptance ratio of virtual network requests, increases the resource utilization of substrate networks, and reduces the average embedding cost of the entire virtual networks.

 EXISTING SYSTEM :

 ? We analyzed the existing problems in modern communication networks, such as the fact that the main problem of mobile networks is the focus on the coverage area, not on the user, and the inability of the network to adaptively respond to bursts of large amounts of data created by the user. ? The simulation results show that the proposed methods outperform existing methods by reducing the number of frequent transmissions and radio failures, in addition to improving the average throughput of users. ? In this paper, the authors proposed two modified TOPSIS methods for the purposes of transmission control in a heterogeneous network.

 DISADVANTAGE :

 ? This can lead to an unbalanced distribution of stations among the APs, causing performance and unfairness problems. ? This work proposes a new approach that combines the number of associated stations and the current load of each AP plus the virtualization of client wireless interfaces. ? To circumvent this problem, some metrics for AP association that define a relation between RSSI and the amount of associated stations to an AP were proposed . ? In this work, we propose a load balancing mechanism based on IEEE 802.11 physical interface virtualization, which uses a metric derived from the amount of associated STAs and channel load to determine how long an STA will stay associated with each AP.

 PROPOSED SYSTEM :

 • We proposed a method for adaptive selection of a wireless access node in a heterogeneous environment. A structural diagram of the optimization stages for wireless heterogeneous networks was developed, making it possible to improve the efficiency of their functioning. • The assessment of the effectiveness of the proposed solutions in relation to the optimization problem of the resources of a heterogeneous network of mobile communication is carried out. • The proposed approach is a generic algorithm that can be applied to various heterogeneous networks, such as public wireless networks. • They then evaluated experimentally the appropriateness of the proposed framework, using a case study, including 5G PM files.

 ADVANTAGE :

 ? The performance of the proposed load balancing mechanism is closely tied to the active time duration of each virtual interface. ? Moreover, we implemented the proposed load balancing mechanism and other association mechanisms that served for performance comparisons. ? The delay incurred when an STA virtualizes to a new AP, called here of virtualization delay, occurs because of channel switching, reassociation, authentication and L2 forwarding tables update. During this time, all in transit packets can be lost, degrading flows performance. ? To evaluate the performance of the proposed mechanism the next simulations involve an infrastructure network composed by three APs disposed at the center of a square area, respecting a minimum distance of 120 meters among them.