Journal of High Speed Networks - Volume 22, issue 3

Authors: Ahmadi, Mahmood | Zadkhosh, Ehsan

Article Type: Research Article

Abstract: The bandwidth growth of networks increased almost exponentially in the recent years and is expected to continue so for years to come. This has been fuelled by emerging new technologies that are capable of achieving higher bandwidths. Consequently, new applications are being developed that take advantage of the new capabilities. These complex applications and heavier traffic have emerged demands on more powerful devices. Furthermore, due to dynamic nature of network traffic, totally scalable methods for packet processing and implementation platforms that are able to cope with this dynamicity are needed. Field-Programmable Gate Arrays (FPGAs) are efficient candidates as they contain …hardware programmable logic units that can be reconfigured based on the application requirements. ρ -VEX is a reconfigurable soft-core Very Long Instruction Word (VLIW) processor on an FPGA and it is able to use the inherit Instruction Level Parallelism (ILP) of applications. ρ -VEX has all the requirements of processing network applications. For the purpose of scalability and economical reasonability, in this paper, an implementation of CRC called one-clock CRC (OC-CRC) as a customized instruction in ρ -VEX is presented. Using this customization, one of packet classification algorithms that have taken advantage of Bloom filter e.g. tuple pruning using Bloom filter is implemented. CRC is selected as a custom instruction because of its importance in Bloom filter as hashing function and error detection in the most of the layer of common protocol stacks. The results show the huge performance gap between General Purpose (GPP) processors and our customized ρ -VEX such that our customized ρ -VEX provided on average approximately 8× speedup. Show more

Keywords: Very long instruction word, one-clock CRC, Bloom filter, packet classification

DOI: 10.3233/JHS-160541

Citation: Journal of High Speed Networks, vol. 22, no. 3, pp. 177-192, 2016

Authors: Liu, Fagui | Deng, Dacheng

Article Type: Research Article

Abstract: With the growing application of services on the basis of physical networks and Internet of Things devices, service composition based on quality of service (QoS) has attracted wide attention. However, QoS-aware service composition with multiple QoS constraints is time consuming work. Given the evident user preference for QoS, we propose a service composition framework and a QoS-aware method incorporating local and global optimization models. Candidate services are preprocessed and assigned different priority levels based on local optimization. The priority weight of quality attributes is obtained by a fuzzy analytic hierarchy process and the approximate optimal composite service is derived by …global optimization for multiple QoS constraints. Simulations verify the proposed method outperforms traditional integer programming (IP) and genetic algorithm, particularly for large scale datasets, providing near optimal solutions with significantly less time cost. Show more

Keywords: Network service, service composition, user preference, quality of service, multiple constraints

DOI: 10.3233/JHS-160542

Citation: Journal of High Speed Networks, vol. 22, no. 3, pp. 193-204, 2016

Authors: Tandjaoui, Amel F. | Kaddour, Mejdi

Article Type: Research Article

Abstract: Despite the abundance of the optimization models proposed so far in the literature to improve the performance or to reduce the deployment costs of wireless mesh networks, only a few works have addressed explicitly the minimization of spectrum utilization in these networks. Considering the scarcity of this critical resource mainly caused by the tremendous recent developments in wireless technologies, we address in this paper the problem of minimizing the number of used radio channels while satisfying a set of end-to-end traffic demands. We formulate to this end a mixed-integer linear program as a cross-layer optimization approach acting on various aspects, …such as channel assignment, power control, medium access and flow routing. Due to the expensive computational costs required to find exact solutions, we propose various approximation schemes that provide near-optimal results in a reasonable amount of time. We illustrate the impact of various parameters such as radio patterns, requested traffic loads, network density on the total required spectrum. Results show how a knowledgeable exploitation of spatial reuse can save significantly spectrum utilization. Show more

Keywords: Wireless mesh networks, channel assignment, spectrum usage, physical interference model, SINR, power control, MILP

DOI: 10.3233/JHS-160543

Citation: Journal of High Speed Networks, vol. 22, no. 3, pp. 205-221, 2016

Authors: Yang, Wei-Dong | Gao, Ze-Ming | Wang, Ke | Liu, Hong-Yue

Article Type: Research Article

Abstract: It has been envisioned that vehicular ad hoc networks (VANETs) would play an important role in future traffic monitoring applications. This paper investigates how VANETs can overcome the strictly limited bandwidth and privacy issues. Firstly, an aggregation scheme is presented to minimize the required overall bandwidth. Subsequently, a privacy algorithm capable of ensuring user privacy in applications is proposed. This proposed mechanism can not only protect the private data of each individual against the adversaries with arbitrary auxiliary information, but also achieve the optimal accuracy of aggregates. Through simulations, the viability of this approach is confirmed.

Keywords: VANETs, data aggregation, differentially private

DOI: 10.3233/JHS-160544

Citation: Journal of High Speed Networks, vol. 22, no. 3, pp. 223-230, 2016

Authors: Guerar, Meriem | Benmohammed, Mohamed | Alimi, Vincent

Article Type: Research Article

Abstract: We are witnessing a growing demand for ATM authentication solutions that overcome the limitations of the de facto standard mechanism based on magnetic card and numeric PIN, that has revealed to be weak against ATM-specific attacks (e.g., skimming and recording attacks). An emerging trend is relying on smartphones as a carrier for authentication. However, authentication mechanisms based on the use of a smartphone requires the same mechanisms to be resilient to new, smartphone-specific threats like device theft and common attacks like shoulder-surfing attacks and spyware. In this paper, we propose a new ATM authentication mechanism called Color Wheel Pin …which combines a usable ATM authentication mechanism with robustness against both generic and smartphone and ATM specific security threats. Show more

Keywords: ATM, authentication, mobile security

DOI: 10.3233/JHS-160545

Citation: Journal of High Speed Networks, vol. 22, no. 3, pp. 231-240, 2016

Authors: Xiao, Xian-cui | Zheng, Xiang-wei

Article Type: Research Article

Abstract: People heavily depend on Internet in their daily lives and propose diversified requirements, such as security and privacy. Network virtualization is considered a promising approach to overcome the disadvantages of the current networks. Therefore, how to reduce the node or link failures resulting from network outages and achieve high-quality network services should be the goal for Internet service providers to improve network security and quality of service. For network survivability, a failure protection mechanism that reserves secondary resources before any failure occurs is presented in this paper. In this study, network link resources are divided into primary and secondary flow …resources. Primary flow resources are used under normal network operation, whereas secondary flow resources are used as backup resources when the network fails. When a VN request arrives, a survivable VN embedding algorithm based on a group search optimizer (GSVNE) is employed to search for optimal embedding solutions. The resource allocation proportions of the primary and secondary flow resources can be dynamically adjusted. Simulation results show that GSVNE outperforms the conventional greedy algorithm, which reflects desirable results in authoritative papers, in terms of cost and acceptance rate. Show more

Keywords: Security, survivability, Group Search Optimizer (GSO), primary and secondary resource flow

DOI: 10.3233/JHS-160546

Citation: Journal of High Speed Networks, vol. 22, no. 3, pp. 241-251, 2016