Abstract
People’s demand for high-traffic applications and the need for Internet of Things (IoT) are enormous in smart cities. The amount of data generated by virtual reality, high-definition video, and other IoT applications is growing at an exponential rate that far exceeds our expectations, and the types of data are becoming more diverse. It has become critical to reliably accommodate IoT-based big data with reasonable resource allocation in optical backbone networks for smart cities. For the problem of reliable transmission and efficient resource allocation in optical backbone networks, a novel resource allocation and spectrum defragmentation mechanism for massive IoT traffic is presented in this paper. Firstly, a routing and spectrum allocation algorithm based on the distance-adaptive sharing protection mechanism (DASP) is proposed, to obtain sufficient protection and reduce the spectrum consumption. The DASP algorithm advocates applying different strategies to the resource allocation of the working and protection paths. Then, the protection path spectrum defragmentation algorithm based on OpenFlow is designed to improve spectrum utilization while providing shared protection for traffic demands. The lowest starting slot-index first (LSSF) algorithm is employed to remove and reconstruct the optical paths. Numerical results indicate that the proposal can effectively alleviate spectrum fragmentation and reduce the bandwidth-blocking probability by 44.68% compared with the traditional scheme.
Highlights
As the foundation of smart cities, Internet of Things (IoT) has become the cornerstone for deepening the construction of the “urban brain”, in which numerous intelligent sensors, devices, and vehicles are connected to realize continuous coverage of urban areas and high-capacity coverage of key scenes [1,2].In smart cities, people’s demand for mobile Internet high-traffic applications and the need for IoT are enormous
In order to improve spectrum utilization, this paper proposes a routing and spectrum allocation algorithm based on the distance-adaptive sharing protection mechanism (DASP) in optical backbone networks for smart cities
The bandwidth-blocking probability (BBP) performance of the proposed routing and spectrum assignment (RSA) and defragmentation algorithms is evaluated via simulations
Summary
People’s demand for mobile Internet high-traffic applications and the need for IoT are enormous. This big-data-driven IoT would be the main driving force for the fifth-generation (5G) infrastructure deployment in smart cities, and the industry believes that 5G can provide comprehensive support for ubiquitous IoT applications [3,4]. It is estimated that by 2021, there will be 28 billion mobile devices connected, of which 16 billion will be IoT-based sensors [5]. The backbone infrastructure must meet the high requirements of high-speed, real-time, massive, stable, and other communication networks in mobile services such as virtual reality, high-definition video, and other IoT applications in smart cities [6,7]
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