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23rd International conference on Advanced Information Networking and Applications Workshops

作者： Ghazel, Cherif Saidane, Leila Univ Manouba Natl Sch Comp Sci Manouba Tunisia

ISBN: (纸本)9781424440009

Satisfying the Quality of Service (QoS) requirements is one of the main objectives in the design and implementation of ip-based Next Generation networks (NGN). This paper formalizes an efficient NGN resource-based call admission control (CAC) method which guarantees the QoS requirements expressed in terms of per-service traffic flow throughput, latency, jitter, loss and authorized waiting delay. The proposed method delivers high quality session-based services compliant with the available capacity over an NGN network based ip/MPLS transport infrastructure. The effects of the proposed method on the QoS provision are demonstrated through modeling of the main QoS parameters. Numerical simulations, which illustrate the proposed method benefits in terms of QoS guarantees and network scalability, are also presented.

关键词： NGN QoS admission control transport network scalability ip/MPLS

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Optimal radio resource management using hybrid handoffs in cellular networks

Optimal radio resource management using hybrid handoffs in c...

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conference on scalability and traffic control in ip networks II

作者： Chen, H Kuo, CCJ Univ So Calif Integrated Media Syst Ctr Los Angeles CA 90089 USA

ISBN: (纸本)0819446475

The optimal radio resource management (RRM) design is formulated as a Semi-Markov Decision Process optimization problem in this research. The stationary optimal call admission control policy, which adopts a hybrid handoff scheme, is determined by solving a set of linear programming equations under users' QoS constraints. The call admission control policy can choose actions of hard- or soft-handoff or simply rejecting the request, depending on the traffic conditions and QoS metrics. The performance is analyzed via simulation and compared with those of the noncontrolled scheme and the fixed RRM scheme. Simulations are conducted by OPNET to study the performance under different traffic conditions.

关键词： radio resource management markov decision process call admission control QoS SMDP OPNET

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Position paper on networks with aggregate Quality-of-Service

Position paper on networks with aggregate Quality-of-Service

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conference on scalability and traffic control in ip networks

作者： Patek, SD Liebeherr, J Univ Virginia Dept Syst & Informat Engn Charlottesville VA 22903 USA

ISBN: (纸本)081944250X

As the Internet continues to expand into new application domains, there is growing demand for differentiated services that provide varying degrees of Quality of Service (QoS). Until recently, the approach for service differentiation in the Internet has focused on providing QoS guarantees to individual traffic flows. This per-flow model has not been widely embraced, largely due to the vast amount of state information that needs to be maintained in the network. As a consequence, the network community is currently redefining the notion of QoS for the Internet, leading to a new service model where guarantees are made to aggregate flows, rather than to individual flows. The notions of aggregate QoS which are being defined, e.g.. by the Differentiated Services (DiffServ) working group in the IETF, are very different from traditional networking concepts and require novel algorithms for traffic control and provisioning. In our work in this area we seek to derive fundamental insights into the nature and delivery of QoS to traffic aggregates, i.e. aggregate QoS. A central feature of service models for aggregate QoS is that there is no requirement for users to specify the composition or the destination of traffic. This significantly complicates the provisioning of network resources and suggests that new, feedback-intensive traffic control algorithms must be developed to mitigate uncertainty about network loading. At present there is little or no theory available to guide the development of such algorithms. In this paper we lay out a research agenda for illuminating the fundamental issues associated with QoS for aggregate traffic. By providing a theoretical reference frame for aggregate QoS, one which provides tools and techniques for congestion control. capacity provisioning, and admission control, we complement ongoing standardization efforts for differentiated services in the Internet.

关键词： aggregate QoS differentiated services traffic control

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Robust LFA Protection for Software-Defined networks (RoLPS)

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IEEE TRANSACTIONS ON NETWORK AND SERVICE MANAGEMENT 2021年第3期18卷 2570-2586页

作者： Merling, Daniel Lindner, Steffen Menth, Michael Univ Tubingen Chair Commun Networks D-72074 Tubingen Germany

In software-defined networks, forwarding entries on switches are configured by a controller. In case of an unreachable next-hop, traffic is dropped until forwarding entries are updated, which takes significant time. Therefore, fast reroute (FRR) mechanisms are needed to forward affected traffic over alternate paths in the meantime. Loop-free alternates (LFAs) and remote LFAs (rLFAs) have been proposed for FRR in ip networks. However, they cannot protect traffic for all destinations and some LFAs may create loops under challenging conditions. This paper proposes robust LFA protection for software-defined networks (RoLPS). RoLPS augments the coverage of (r)LFAs with novel explicit LFAs (eLFAs). RoLPS ranks available LFAs according to protection quality and complexity for selection of the best available LFA. Furthermore, we introduce advanced loop detection (ALD) so that RoLPS stops loops caused by LFAs. We evaluate RoLPS-based protection variants on a large set of representative networks with unit and non-unit link costs. We study their protection coverage, additional forwarding entries, and path extensions for rerouted traffic, and compare them with MPLS facility backup. Results show that RoLPS can protect traffic against all single link or node failures, and against most double failures while inducing only little overhead. We implement FRR on the P4-programmable switch ASIC Tofino and provide a control plane logic based on RoLPS. Measurement results show that the prototype achieves a throughput of 100 Gb/s, reroutes traffic within less than a millisecond, and reliably detects and drops looping traffic.

关键词： Routing Topology Multiprotocol label switching ip networks Prototypes Registers Terminology Software-defined networking P4 loop-free alternates resilience link protection node protection scalability

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Voip Quality Measurement System Using Flow Mediation for Large-Scale ip networks

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IEICE TRANSACTIONS ON COMMUNICATIONS 2011年第7期E94B卷 1973-1981页

作者： Kobayashi, Atsushi Ishibashi, Keisuke NTT Corp NTT Informat Sharing Labs Musashino Tokyo 1808585 Japan

We present the development of a Voip quality of service (QoS) measurement system that enables operators to diagnose a QoS degradation segment. Our system uses a flow-based passive measurement method to fulfill the requirement for QoS measurement in large-scale ip networks. In particular, we adopt an access control list (ACL)-based filtering function that selects traffic to monitor and develop a function for correlating signals and media data records. This correlation function is required to dynamically configure ACL-based filtering for monitoring media streams whose port numbers are determined by a signaling protocol. To improve the scalability of existing measurement systems, we also develop a hardware-based filtering engine on a commercial switch as well as a mediation box that performs QoS calculation based on traffic records exported by the engine in a distributed manner. We demonstrate the feasibility of the measurement system by evaluating a prototype system.

关键词： ipFIX PSAMP sFlow Voip Sip

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Routing alternatives for virtual private networks

Routing alternatives for virtual private networks

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IEEE International conference on Communications (ICC)

作者： Apostolopoulos, G

ISBN: (纸本)0780378024

Virtual Private networks (VPNs) are a popular method for connecting enterprises over a public network infrastructure. Using an ip-based backbone has the potential to significantly reduce the capital expenditure of the service providers and allow them to offer a variety of legacy and new services using a common infrastructure. Recently a variety of methods has been proposed that enable implementation of VPN services over ip-based backbone networks. scalability is one of the basic requirements in all the ip-based VPN architectures. In this paper, we focus on cases where the provider must support explicit routing of customer's traffic, and thus has to implement some form of constrained path computation in its backbone network. Routing protocols that support constrained path computation have been known to cause high volumes of routing protocol control traffic. This overhead can seriously affect the operation of the backbone routers and limit the scalability of the VPN architecture. We propose a mechanism that significantly reduces the overhead from routing protocol messages in the core of the network by exchanging resource availability information only between the edge routers. We show that with relatively straightforward changes to the protocols used in the backbone, it is possible to achieve considerable savings in the amount of the routing protocol control overhead without compromising routing performance.

关键词： Network protocols

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Clustered Multicast Source Routing for Large-Scale Cloud Data Centers

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IEEE ACCESS 2021年 9卷 12693-12705页

作者： Alqahtani, Jarallah Sinky, Hassan H. Hamdaoui, Bechir Oregon State Univ Sch Elect Engn & Comp Sci Corvallis OR 97331 USA Umm Al Qura Univ Coll Comp & Informat Syst Mecca 24381 Saudi Arabia

The multi-tenancy concept in cloud data center (DC) networks paves the way towards advancements and innovation in the underlying infrastructure such as network virtualization. Multicast routing is essential in leveraging multi-tenancy to its full potential. However, traditional ip multicast routing is not suitable for DC networks due to the need to support a massive amount of multicast groups and hosts. State-of-the-art DC multicast routing approaches aim to overcome these scalability issues by, for instance, taking advantage of the symmetry of DC topologies and the programmability of DC switches to compactly encode multicast group information inside packets, thereby reducing the overhead resulting from the need to store the states of flows at the network switches. Although these approaches scale well with the number of multicast groups, they do not perform well with group sizes and, as a result, yield substantial traffic control overhead and network congestion. In this article, we present Bert, a scalable source-initiated DC multicast routing approach that scales well with both the number and size of multicast groups through the clustering of multicast group members where each cluster employs its own forwarding rules. Compared to the state-of-the-art approach, Bert yields much less traffic control overhead by significantly reducing packet header sizes and eliminating switch memory usage across the switches.

关键词： Routing Network topology Cloud computing Topology scalability Data centers Servers Cloud data center networks multicast routing multicast scalability multi-tenancy network virtualization

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Generalized network engineering: Optimal pricing and routing for multi-service networks

Generalized network engineering: Optimal pricing and routing...

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conference on scalability and traffic control in ip networks II

作者： Mitra, D Wang, Q Bell Labs Lucent Technol Murray Hill NJ 07974 USA

ISBN: (纸本)0819446475

One of the functions of network engineering is to allocate resources optimally to forecasted demand. We generalize the mechanism by incorporating price-demand relationships into the problem formulation, and optimizing pricing and routing jointly to maximize total revenue. We consider a network, with fixed topology and link bandwidths, that offers multiple services, such as voice and data, each having characteristic price elasticity of demand, and quality of service and policy requirements on routing. Prices, which depend on service type and origin-destination, determine demands, that are routed, subject to their constraints, so as to maximize revenue. We study the basic properties of the optimal solution and prove that link shadow costs provide the basis for both optimal prices and optimal routing policies. We investigate the impact of input parameters, such as link capacities and price elasticities, on prices, demand growth, and routing policies. Asymptotic analyses, in which network bandwidth is scaled to grow, give results that are noteworthy for their qualitative insights. Several numerical examples illustrate the analyses.

关键词： traffic engineering routing pricing revenue maximization capacity scaling demand growth

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A new control architecture with enhanced ARP,burst-based transmission, and hop-based wavelength allocation for Ethernet-supported ip-over-WDM MANs

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IEEE JOURNAL ON SELECTED AREAS IN COMMUNICATIONS 2004年第8期22卷 1419-1431页

作者： Liu, JX Ansari, N New Jersey Inst Technol Dept Elect & Comp Engn Adv Networking Lab Newark NJ 07102 USA

This paper focuses on the control architecture and the enabling technologies for the Ethernet-supported Internet protocol-over-wavelength-division-multiplexing metropolitan area networks. We present the general architecture of an access node of such networks and propose solutions to facilitate the essential system functionalities. The aim is to render the flexible and high-capacity metropolitan network, which provides service provisioning improvement and resource utilization efficiency for the packet-dominated data traffic. Specifically, an enhanced address resolution protocol is proposed to reduce the call setup latency and the signaling overhead associated with the address probing procedure, a burst-based transmission mechanism is adopted to improve the network throughput and resource utilization efficiency, and a wavelength allocation algorithm is investigated to provide flexible bandwidth multiplexing with fairness and high scalability. Theoretical analysis and simulations are conducted to evaluate the performance of our algorithms, demonstrating that the proposed architecture and technologies deliver substantial transport performance improvement with efficient network resource utilization.

关键词： address resolution protocol (ARP) Ethernet traffic assembly wavelength allocation wavelength-division-multiplexing (WDM)

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Scalable mobile ethernet and fast vertical handover

Scalable mobile ethernet and fast vertical handover

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IEEE Wireless Communications and Networking conference

作者： Kuroda, M Inoue, M Okubo, A Sakakura, T Shimizu, K Adachi, F Commun Res Labs Yokosuka Kanagawa 2390847 Japan

ISBN: (纸本)0780383443

The 3G cellular system has infiltrated into market and the next generation wireless system called Beyond 3G is discussed at ITU-R. The Beyond 3G system integrates various wireless accesses including 3G and wireless LANs and provides an all ip wireless solution to offer services taking advantage of each wireless communication of the system. Current approach to integrate wireless systems is to localize wireless dependent functions and to integrate into all ip network using ip technologies. We propose a scalable Mobile Ethernet architecture for the all ip integrated network using MAC layer technologies, such as Provider Bridge, RPR, and IEEE802, and the fast vertical handover introducing common radio resource and signaling managements. We discuss network segmentation with mobility management and multicast management for the scalability of the Mobile Ethernet by reducing network traffic. We evaluate the network from the viewpoint of scalability. In the evaluation we understand that the design that the gateway switch of a segment forwarding MAC frames as an anchor point becomes effective in case that the gateway switch of each segment cannot hold entries for all mobile terminals. We also evaluate the vertical handover comparing to Mobile ipv6 fast handover, and understand that the fast vertical handover consumes less network resources and flexible in having an anchor point for handover.

关键词： cellular radio wireless LAN ip networks access protocols telecommunication network management multicast communication telecommunication traffic telecommunication signalling telecommunication congestion control 3G mobile communication telecommunication switching internetworking fast vertical handover 3G cellular system beyond 3G system scalable mobile Ethernet architecture ip integrated network MAC layer technologies provider bridge radio signaling management radio resource management network segmentation mobility management multicast management network traffic gateway switch mobile ipv6 fast handover wireless local area network (WLAN) telecommunication traffic Internet Protocol networks traffic network mobility management Common Channel Signaling internetworking anchor point CARRIER SYSTEM telecommunication congestion control multicast communication Telecommunication network management cellular radio third generation scalability

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