Optical Switching and Networking最新文献

{"title":"QoS-aware hybrid cloudlet placement over joint fiber and wireless backhaul access network","authors":"Chao He ,&nbsp;Ruyan Wang ,&nbsp;Dapeng Wu ,&nbsp;Hong Zhang ,&nbsp;Zefu Tan","doi":"10.1016/j.osn.2022.100678","DOIUrl":"10.1016/j.osn.2022.100678","url":null,"abstract":"<div><p>Over the last decades, the emerging paradigms, e.g., centralized mobile cloud computing (MCC), multi-access edge computing (MEC), and collaborative computing offloading (CCO), have attracted extensive attention in adaptive 5G low latency communication for Tactile Internet. Besides, a novel integrated wireless optical transport network emerges in access networks and supports joint fronthaul and backhaul services. Therefore, considering that the task offloading response time, the needs of proximity, and the ultra-dense 5G small cell deployment, a novelty hybrid cloudlet deployment scheme over fiber and wireless backhaul-aware infrastructure is created with efficient cost optimization in mind. In this work, the envisioned Fiber Wireless networks (FiWi) consists of optical backhaul and wireless fronthaul (i.e., integrated access network and backhaul link), whereby base stations (BSs) with fiber and wireless backhauls are referred as wired-BS (WBS) and unwired-BS (UBS), respectively. Therefore, to meet the quality of service (QoS) delay constraints, cloudlets can be deployed in either UBSs, WBS, or remote node (RN). However, we apply mixed-integer line programming (MILP) to resolve the convex optimization problem in terms of minimization deployment cost. Besides, we describe the QoS-aware hybrid cloudlet placement cost algorithm for WBS and UBS coverage areas against different network conditions. It was shown through experimental measurements that the proposed architecture can achieve the scalability in different deployment scenarios. Also, the dependency of minimization cloudlet deployment cost on variable network parameters in terms of user density, network framework, and network QoS can be validated.</p></div>","PeriodicalId":54674,"journal":{"name":"Optical Switching and Networking","volume":"45 ","pages":"Article 100678"},"PeriodicalIF":2.2,"publicationDate":"2022-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S1573427722000145/pdfft?md5=303e63727fb15535d582bc671aaca6be&pid=1-s2.0-S1573427722000145-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124720026","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"ILP models and improved methods for the problem of routing and spectrum allocation","authors":"Jiading Wang,&nbsp;Maiko Shigeno,&nbsp;Qian Wu","doi":"10.1016/j.osn.2022.100675","DOIUrl":"10.1016/j.osn.2022.100675","url":null,"abstract":"<div><p><span><span>Elastic Optical Networks<span> (EONs) using a flexible wavelength allocation technique with smaller granularity of spectrum can improve the efficiency and flexibility for diverse traffic transmission. However, due to the small granularity in EONs, the </span></span>resource allocation problems become more complicated than that of the existing </span>network architecture<span><span>. By classifying the integer linear programming (ILP) models for solving the resource allocation problem on EONs into four categories, i.e., path/slot, path/channel, node/slot and node/channel, the characteristics of each are reviewed and tighter lower bounds estimation schemes for these ILP models are designed. Also, for channel models (i.e., path/channel and node/channel models), we propose two improved channel generation methods in pre-processing to reduce the number of variables. In the </span>comparative experiments, we show the superiority of our methods, and by using them, analyze the characteristics of the four models.</span></p></div>","PeriodicalId":54674,"journal":{"name":"Optical Switching and Networking","volume":"45 ","pages":"Article 100675"},"PeriodicalIF":2.2,"publicationDate":"2022-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131038926","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Founding AP's IVM and related IHM for subway LiFi network","authors":"Xiaoqi Wang,&nbsp;Chaoqin Gan,&nbsp;Shibao Wu,&nbsp;Yitong Chen,&nbsp;Yixin Chen","doi":"10.1016/j.osn.2022.100676","DOIUrl":"10.1016/j.osn.2022.100676","url":null,"abstract":"<div><p><span>In this paper, the information value model (IVM) of an access point (AP) and the related intelligent handover<span> model (IHM) are firstly founded in the subway light-fidelity (LiFi) network. At first, based on statistical methods, the IVM is created by analyzing the behavioral characteristics of subway passengers. By the IVM, the probability of user access to each AP can be successfully predicted. Next, based on this probability, the IHM is created by deeply analyzing the alternating blockage problem of handholds. By the IHM, the system can self-adapt to the </span></span>hysteresis<span> state. This not only effectively avoids ping-pong handovers, but also reduces outage probability. Finally, by simulation, the effectiveness of the above IVM and IHM has been demonstrated. The simulation results indicate that the accuracy of predicting user target AP can be up to 92% by the IVM. Specially, compared with using the standard handover model, the throughput of the network not only increases 11.5%, but also the outage probability of the network decreases 23.6% by using the IHM.</span></p></div>","PeriodicalId":54674,"journal":{"name":"Optical Switching and Networking","volume":"45 ","pages":"Article 100676"},"PeriodicalIF":2.2,"publicationDate":"2022-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130455620","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Spectrum slicing-based fragmentation aware routing and spectrum allocation in elastic optical networks","authors":"Huanlin Liu ,&nbsp;Jie Ren ,&nbsp;Yong Chen ,&nbsp;Junling Hu ,&nbsp;Chang Tang ,&nbsp;Mingming Tang","doi":"10.1016/j.osn.2022.100673","DOIUrl":"10.1016/j.osn.2022.100673","url":null,"abstract":"<div><p>For addressing the problems of high bandwidth blocking probability<span><span> and low spectrum utilization caused by spectrum fragmentation<span> in elastic optical networks (EONs), a dynamic EONs node architecture for deploying spectrum slicer is studied to transmit the request in the paper. The spectrum slicer can relax spectrum contiguity and improve spectrum fragmentation utilization for </span></span>request's lightpath<span> establishing. Then, a fragmentation aware routing and spectrum allocation based on spectrum slicing algorithm (SS-FA-RSA) is put forward. In the routing selection phase of SS-FA-RSA, a path weight value formula is designed to trade-off between path length, normalized fragmentation rate and available spectrum slicer, which reorder the candidate paths to select the most appropriate routing path for the request. Moreover, in the spectrum allocation phase, the spectrum slicing algorithm is proposed to increase the utilization of spectrum fragmentation by reusing spectrum fragmentation in EONs. Comparing with other algorithms, the simulation results show the proposed SS-FA-RSA can get better in bandwidth blocking probability and spectrum utilization.</span></span></p></div>","PeriodicalId":54674,"journal":{"name":"Optical Switching and Networking","volume":"45 ","pages":"Article 100673"},"PeriodicalIF":2.2,"publicationDate":"2022-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131053378","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Editorial test of time","authors":"Admela Jukan,&nbsp;Martin Reisslein,&nbsp;Andrea Bianco,&nbsp;George Rouskas","doi":"10.1016/j.osn.2022.100680","DOIUrl":"10.1016/j.osn.2022.100680","url":null,"abstract":"","PeriodicalId":54674,"journal":{"name":"Optical Switching and Networking","volume":"45 ","pages":"Article 100680"},"PeriodicalIF":2.2,"publicationDate":"2022-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122341731","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Neural network-assisted decision-making for adaptive routing strategy in optical datacenter networks","authors":"Yuanyuan Hong ,&nbsp;Xuezhi Hong ,&nbsp;Jiajia Chen","doi":"10.1016/j.osn.2022.100677","DOIUrl":"10.1016/j.osn.2022.100677","url":null,"abstract":"<div><p>To improve the blocking probability (BP) performance and enhance the resource utilization, a correct decision of routing strategy which is most adaptable to the network configuration and traffic dynamics is essential for adaptive routing in optical datacenter networks (DCNs). A neural network (NN)-assisted decision-making scheme is proposed to find the optimal routing strategy in optical DCNs by predicting the BP performance for various candidate routing strategies. The features of an optical DCN architecture (i.e., the rack number <em>N</em>, connection degree <em>D</em>, spectral slot number <em>S</em> and optical transceiver number <em>M</em>) and the traffic pattern (i.e., the ratio of requests of various capacities <em>R</em>, and the load of arriving request) are used as the input to the NN to estimate the optimal routing strategy. A case of two-strategy decision in the transparent optical multi-hop interconnected DCN is studied. Three metrics are defined for performance evaluation, which include (a) the ratio of the load range with wrong decision over the whole load range of interest (i.e., decision error <em>E</em>), (b) the maximum BP loss (<em>BPL</em>) and (c) the resource utilization loss (<em>UL</em>) caused by the wrong decision. Numerical results show that the ratio of error-free cases over tested cases always surpasses 83% and the average values of <em>E</em>, <em>BPL</em> and <em>UL</em> are less than 3.0%, 4.0% and 1.2%, respectively, which implies the high accuracy of the proposed scheme. The results validate the feasibility of the proposed scheme which facilitates the autonomous implementation of adaptive routing in optical DCNs.</p></div>","PeriodicalId":54674,"journal":{"name":"Optical Switching and Networking","volume":"45 ","pages":"Article 100677"},"PeriodicalIF":2.2,"publicationDate":"2022-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S1573427722000133/pdfft?md5=8bec25e8c1926de34c5a1843e1be150e&pid=1-s2.0-S1573427722000133-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124820605","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"DROAD: Demand-aware reconfigurable optically-switched agile data center network","authors":"Bartlomiej Siniarski ,&nbsp;Dinh Danh Le ,&nbsp;Conor McArdle ,&nbsp;John Murphy ,&nbsp;Liam Barry","doi":"10.1016/j.osn.2022.100683","DOIUrl":"10.1016/j.osn.2022.100683","url":null,"abstract":"<div><p>We present a Demand-aware Reconfigurable Data Center Network architecture design (DROAD) with integrated fast-switching optics and space switches that allows dynamic reconfiguration and separation of intra- and inter-cluster connections. The performance analysis results show a 64% improvement in average Flow Completion Time and a significant reduction in TCP session time, as well as a reduced number of sessions needed to be opened compared to traditional electrically-switched leaf-spine networks.</p></div>","PeriodicalId":54674,"journal":{"name":"Optical Switching and Networking","volume":"45 ","pages":"Article 100683"},"PeriodicalIF":2.2,"publicationDate":"2022-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S1573427722000194/pdfft?md5=32aa7e9a5ab874a9ea29816212176c84&pid=1-s2.0-S1573427722000194-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121619699","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Software-defined optical intra-data center network and access control Strategy","authors":"P.A. Baziana ,&nbsp;G. Drainakis ,&nbsp;E. Sykas","doi":"10.1016/j.osn.2022.100679","DOIUrl":"10.1016/j.osn.2022.100679","url":null,"abstract":"<div><p>The continuously emerging cloud services provide an unprecedented traffic growth into the large-scale data centers (DCs) globally. In this paper, we introduce an optical DC network (DCN) architecture to organize the servers into computing clusters. Since a high percentage of the total DCΝ traffic is served within a cluster, we assume two distinct networks: the intra-cluster passive optical network that handles the traffic destined to any server of the same cluster and the inter-cluster one to route the traffic to any other cluster. The servers interconnection within the passive optical intra-cluster network causes low power consumption, while the Top-of-Cluster (ToC) switch requires less ports than a relative Top-of-Rack (ToR) one to interconnect the same number of servers within the intra network, reducing even more the total power consumption. In the data plane, the intra- and the inter-cluster networks use separate wavelengths. In the control plane, the software-defined networking (SDN) paradigm is followed. Especially, in each cluster we adopt a cluster controller to coordinate the medium access control (MAC) in both the intra and inter-cluster networks. Unlike other studies that assume electrical connectivity with the controller, we consider that it is performed in the optical domain to guarantee the effective synchronized operation of the control and data planes. In our work, we focus on the intra-cluster network. We propose a synchronous transmission software-defined bandwidth allocation (SD-BA) MAC protocol to fairly coordinate the collisions-free transmission of different quality of service traffic categories in the intra-cluster network, based on the wavelength and time division multiplexing (W&amp;TDM) techniques. The proposed DCN architecture along with the SD-MAC protocol provides scalability and efficiency. Simulations results show that the proposed SD-BA MAC protocol achieves almost 100% bandwidth utilization, while it reaches at high loads 145% higher throughput, 573% lower delay and 233% less dropped packets as compared to the relative DMAC network architecture (Zheng and Sun, Apr. 2020) [24]. Also, the proposed intra-cluster DCN architecture is compared to some other currently leading relative ones in terms of throughput and power consumption and it is proven to be a performance and energy efficient DCN solution.</p></div>","PeriodicalId":54674,"journal":{"name":"Optical Switching and Networking","volume":"45 ","pages":"Article 100679"},"PeriodicalIF":2.2,"publicationDate":"2022-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124348950","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Routing and spectrum assignment employing long short-term memory technique for elastic optical networks","authors":"Lina Cheng,&nbsp;Yang Qiu","doi":"10.1016/j.osn.2022.100684","DOIUrl":"10.1016/j.osn.2022.100684","url":null,"abstract":"<div><p><span>With the prevalence of some high bandwidth-demanding applications, such as cloud computing, traditional wavelength-division-multiplexing </span>passive optical networks<span><span> have difficulties in satisfying such growing bandwidth demands due to its limited allocation-flexibility and utilization-efficiency. Therefore, elastic optical networks (EONs). In order to realize the flexibility in EONs, sophisticated routing and spectrum allocation (RSA) algorithms areone of the keyenabling technologies. However, most of the previous RSA algorithms were proposed with invariant routing and spectrum allocation strategies, which ignored considering the time-varying characteristics of EONs due to the variable network architecture and service provisioning. And such time-varying characteristics can deteriorate the </span>spectrum fragmentation and the service blocking performances of EONs, which stimulates the application of various machine-learning technologies in EONs. In this paper, a long short-term memory based routing and spectrum assignment (LSTM-RSA) algorithm is proposed for EONs. By employing the long short-term memory technique to sense the complex status of EONs (e.g. spectral usage on the selected paths), the proposed LSTM-RSA algorithm gradually learns successful strategies through accumulating operation experience in the process of interaction and obtains higher returns through enhanced operation, which helps improve the spectrum fragmentation and the service blocking performances in EONs. Simulation results show that the spectrum fragmentation rate and the blocking rate of the proposed LSTM-RSA algorithm are reduced by about 6% and 8.9%, respectively, when compared to the traditional shortest-path-routing first-fitting RSA algorithm.</span></p></div>","PeriodicalId":54674,"journal":{"name":"Optical Switching and Networking","volume":"45 ","pages":"Article 100684"},"PeriodicalIF":2.2,"publicationDate":"2022-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131911465","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Optical network design and analysis tools: A test of time","authors":"Miquel Garrich Alabarce ,&nbsp;Pablo Pavón Mariño","doi":"10.1016/j.osn.2021.100651","DOIUrl":"10.1016/j.osn.2021.100651","url":null,"abstract":"<div><p><span>Telecom operators' infrastructure is sustained by optical communication<span> networks that provide the means for exchanging large amounts of information, which is essential for many modern society needs. Optical networks are characterized by rapid breakthroughs in a variety of technologies. Relevantly, the last decade encompassed remarkable advances in optical networks’ subfields of signal processing, electronics, </span></span>photonics<span><span>, communications, protocols, and control-plane architectures. Hence, these advancements unlocked unprecedented transmission capacities, reconfigurability and </span>programmability<span>, entailing an evolution in the way which networks were designed, planned, and analyzed. In this paper, we review the historical status of optical planning and design tools by focusing on the major enabling technologies and relevant landmarks of the last decade(s). We begin by pinpointing the major breakthroughs in the optical data plane, estimation models capturing the transmission medium behavior and the control plane. We then distil the implications that these advancements entail in the landscape of optical network design and analysis tools, which commonly sit “on top” of the control plane or as a fully separated entity. Then, we speculate with our view for the future, in which automatic validation of optical network operations and dimensioning jointly with learning/artificial intelligence mechanisms will permit zero-touch optical networking: i.e. updating, provisioning, and upgrading network capacities, by means of automation with minimal human intervention. We conclude with a proposal of an architecture that encompasses data and control planes in a comprehensive manner for paving the way towards zero-touch optical networking.</span></span></p></div>","PeriodicalId":54674,"journal":{"name":"Optical Switching and Networking","volume":"44 ","pages":"Article 100651"},"PeriodicalIF":2.2,"publicationDate":"2022-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132179591","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}