Abstract
Cloud radio access network (C-RAN) becomes a promising scenario to accommodate high-performance services with ubiquitous user coverage and real-time cloud computing in 5G area. However, the radio network, optical network and processing unit cloud have been decoupled from each other, so that their resources are controlled independently. Traditional architecture cannot implement the resource optimization and scheduling for the high-level service guarantee due to the communication obstacle among them with the growing number of mobile internet users. In this paper, we report a study on multi-dimensional resources integration (MDRI) for service provisioning in cloud radio over fiber network (C-RoFN). A resources integrated provisioning (RIP) scheme using an auxiliary graph is introduced based on the proposed architecture. The MDRI can enhance the responsiveness to dynamic end-to-end user demands and globally optimize radio frequency, optical network and processing resources effectively to maximize radio coverage. The feasibility of the proposed architecture is experimentally verified on OpenFlow-based enhanced SDN testbed. The performance of RIP scheme under heavy traffic load scenario is also quantitatively evaluated to demonstrate the efficiency of the proposal based on MDRI architecture in terms of resource utilization, path blocking probability, network cost and path provisioning latency, compared with other provisioning schemes.
Highlights
Flexible gird is achieved by taking advantage of the orthogonal frequency division multiplexing (OFDM)[9], which can allocate necessary spectrum resources with a fine tailored granularity for various user connection demands, and offer cost-effective and highly-available connectivity channels[10,11,12]
The processing units (PU) cloud and OpenFlow protocol (OFP) agents are realized on an array of virtual machines created by VMware ESXi V5.1 running on IBM X3650 servers
For OpenFlow-based multi-dimensional resources integration (MDRI) control plane, the optical controller (OC) server is assigned to support the proposed architecture and deployed by means of three virtual machines for MDRI control, network virtualization and path computation element (PCE) strategy as plug in, while the radio controller (RC) server is used as radio frequency resource monitor and assignment
Summary
Flexible gird is achieved by taking advantage of the orthogonal frequency division multiplexing (OFDM)[9], which can allocate necessary spectrum resources with a fine tailored granularity for various user connection demands (e.g., sub-wavelength and super-channel traffic), and offer cost-effective and highly-available connectivity channels[10,11,12]. The motivations for MDRI architecture in C-RoFN can break the limit among radio, optical and processing unit domains, implement the multiple layer integration and cross stratum optimization with SDN orchestration, which can allocate and optimize multiple dimensional resources efficiently in a control manner of open system. The performance of RIP scheme under heavy traffic load scenario is quantitatively evaluated to demonstrate the efficiency of the proposal based on MDRI architecture in terms of resource utilization, path blocking probability, network cost and path provisioning latency, compared with other provisioning schemes The results indicate this scheme has excellent performance and constitutes a promising candidate for future cloud radio over fiber network. The MDRI can implement the multiple layer integration and cross stratum optimization based on OpenFlow-enabled C-RoFN with SDN orchestration, which can allocate and optimize the resources of radio, optical network and processing interweaved with each other efficiently in a control manner of open system. In order to provide the end-to-end QoS, multiple stratum resources can be merged through controllers’ interaction with horizontal merging, while achieving global cross stratum optimization of optical network and processing resources
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