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Search Results (4)

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Keywords = opportunistic fog

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11 pages, 1211 KiB  
Article
CSV: Content Service Offloading System with Vehicular Caching
by Yeunwoong Kyung and Taewon Song
Sensors 2022, 22(20), 7967; https://doi.org/10.3390/s22207967 - 19 Oct 2022
Cited by 2 | Viewed by 1441
Abstract
Vehicular caching (VC) has been considered as a promising technology to provide low end-to-end service latency and reduce the load of networks. However, it is difficult for VC to provide service continuity because of its opportunistic availability according to mobility. To mitigate this [...] Read more.
Vehicular caching (VC) has been considered as a promising technology to provide low end-to-end service latency and reduce the load of networks. However, it is difficult for VC to provide service continuity because of its opportunistic availability according to mobility. To mitigate this problem, we introduce a CSV: Content service offloading System with VC which can opportunistically distribute the load of the content server and support the service continuity. In CSV, the content service can be migrated between fog node (FN) and VC while maintaining the ongoing service without service disruption, which can opportunistically distribute the load of the content server and support the service continuity during migration. To assess the performance of CSV, we develop an analytical model for VC offloading efficiency. Extensive simulation results demonstrate that CSV can reduce the load of the content server compared to the conventional system. Full article
(This article belongs to the Section Physical Sensors)
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14 pages, 2194 KiB  
Article
Smart-Contract-Based Automation for OF-RAN Processes: A Federated Learning Use-Case
by Jofina Jijin, Boon-Chong Seet and Peter Han Joo Chong
J. Sens. Actuator Netw. 2022, 11(3), 53; https://doi.org/10.3390/jsan11030053 - 13 Sep 2022
Cited by 1 | Viewed by 2479
Abstract
The opportunistic fog radio access network (OF-RAN) expands its offloading computation capacity on-demand by establishing virtual fog access points (v-FAPs), comprising user devices with idle resources recruited opportunistically to execute the offloaded tasks in a distributed manner. OF-RAN is attractive for providing computation [...] Read more.
The opportunistic fog radio access network (OF-RAN) expands its offloading computation capacity on-demand by establishing virtual fog access points (v-FAPs), comprising user devices with idle resources recruited opportunistically to execute the offloaded tasks in a distributed manner. OF-RAN is attractive for providing computation offloading services to resource-limited Internet-of-Things (IoT) devices from vertical industrial applications such as smart transportation, tourism, mobile healthcare, and public safety. However, the current OF-RAN design is lacking a trusted and distributed mechanism for automating its processes such as v-FAP formation and service execution. Motivated by the recent emergence of blockchain, with smart contracts as an enabler of trusted and distributed systems, we propose an automated mechanism for OF-RAN processes using smart contracts. To demonstrate how our smart-contract-based automation for OF-RAN could apply in real life, a federated deep learning (DL) use-case where a resource-limited client offloads the resource-intensive training of its DL model to a v-FAP is implemented and evaluated. The results validate the DL and blockchain performances of the proposed smart-contract-enabled OF-RAN. The appropriate setting of process parameters to meet the often competing requirements is also demonstrated. Full article
(This article belongs to the Special Issue Smart Systems: Challenges, Enabling Technologies and Software Solutions)
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11 pages, 1409 KiB  
Communication
Prioritized Task Distribution Considering Opportunistic Fog Computing Nodes
by Yeunwoong Kyung
Sensors 2021, 21(8), 2635; https://doi.org/10.3390/s21082635 - 9 Apr 2021
Cited by 3 | Viewed by 2185
Abstract
As service latency and core network load relates to performance issues in the conventional cloud-based computing environment, the fog computing system has gained a lot of interest. However, since the load can be concentrated on specific fog computing nodes because of spatial and [...] Read more.
As service latency and core network load relates to performance issues in the conventional cloud-based computing environment, the fog computing system has gained a lot of interest. However, since the load can be concentrated on specific fog computing nodes because of spatial and temporal service characteristics, performance degradation can occur, resulting in quality of service (QoS) degradation, especially for delay-sensitive services. Therefore, this paper proposes a prioritized task distribution scheme, which considers static as well as opportunistic fog computing nodes according to their mobility feature. Based on the requirements of offloaded tasks, the proposed scheme supports delay sensitive task processing at the static fog node and delay in-sensitive tasks by means of opportunistic fog nodes for task distribution. To assess the performance of the proposed scheme, we develop an analytic model for the service response delay. Extensive simulation results are given to validate the analytic model and to show the performance of the proposed scheme, compared to the conventional schemes in terms of service response delay and outage probability. Full article
(This article belongs to the Special Issue Cloud and Edge Computing in Wireless Sensor Networks and Internet of Things)
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14 pages, 2492 KiB  
Article
Multi-Objective Optimization of Task-to-Node Assignment in Opportunistic Fog RAN
by Jofina Jijin, Boon-Chong Seet and Peter Han Joo Chong
Electronics 2020, 9(3), 474; https://doi.org/10.3390/electronics9030474 - 12 Mar 2020
Cited by 7 | Viewed by 3219
Abstract
The opportunistic fog radio access network (OF-RAN) is a promising RAN architecture proposed for next-generation cellular networks. OF-RAN extends the current fog RAN (F-RAN) architecture by introducing virtual fog access points (v-FAPs) that can be formed on-demand by a set of resourceful end-user [...] Read more.
The opportunistic fog radio access network (OF-RAN) is a promising RAN architecture proposed for next-generation cellular networks. OF-RAN extends the current fog RAN (F-RAN) architecture by introducing virtual fog access points (v-FAPs) that can be formed on-demand by a set of resourceful end-user devices available in an opportunistic manner. These devices in the v-FAP collaboratively serve as the service nodes to a resource-limited local client by performing resource-demanding processing tasks on its behalf. Hence, appropriately assigning the client task to the service nodes of the v-FAP, i.e., task-to-node assignment (TNA), is a fundamental problem in OF-RAN. This paper formulates and solves the TNA as a multi-objective optimization problem, with the goals of minimizing energy and latency of the v-FAP, while maximizing fairness (or load balancing) amongst its service nodes by minimizing their maximum load. Full article
(This article belongs to the Special Issue Opportunistic Networks)
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