Dr Ning Wang
Lecturer in Networks
Qualifications: B.Eng, M.Eng, PhD
Email: n.wang@surrey.ac.uk
Phone: Work: 01483 68 6005
Room no: 09 BA 02
Further information
Biography
Further details can be found on my personal web page.
Research Interests
- Information/content centric networks
- QoS/Energy/Resilience aware network optimisations
- Network virtualisation
- Autonomic network management
- Smart grid communications
Research Collaborations
My research collaborations are mainly through funded research projects:
- FP7 COMET Project: Telefonica (Spain), UCL (UK), IntraCom (Greece), Warsaw University of Technology (Poland), PrimeTel (Cyprus)
- FP7 (IRSES) EVANS Project: University of Essex (UK), Simula (Norway), UPC (Spain), Tsinghua University (China), BUPT (China)
- FP7 C-DAX Project: Alcatel-Lucent (Belgium), Alliander (Holland), National Instrument (Sweden), UCL (UK), University of Tuebingen (Germany), IBBT (Belgium), EPFL (Swizterland), Radboud University Nijmegen (Holland)
Publications
Highlights
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(2012) 'Optimizing Link Sleeping Reconfigurations in ISP Networks with Off-Peak Time Failure Protection'. IEEE IEEE Transactions on Network and Service Management, (99), pp. 1-13.Full text is available at: http://epubs.surrey.ac.uk/738895/
Abstract
Energy consumption in ISP backbone networks has been rapidly increasing with the advent of increasingly bandwidth-hungry applications. Network resource optimization through sleeping reconfiguration and rate adaptation has been proposed for reducing energy consumption when the traffic demands are at their low levels. It has been observed that many operational backbone networks exhibit regular diurnal traffic patterns, which offers the opportunity to apply simple time-driven link sleeping reconfigurations for energy-saving purposes. In this work, an efficient optimization scheme called Time-driven Link Sleeping (TLS) is proposed for practical energy management which produces an optimized combination of the reduced network topology and its unified off-peak configuration duration in daily operations. Such a scheme significantly eases the operational complexity at the ISP side for energy saving, but without resorting to complicated online network adaptations. The GÉANT network and its real traffic matrices were used to evaluate the proposed TLS scheme. Simulation results show that up to 28.3% energy savings can be achieved during off-peak operation without network performance deterioration. In addition, considering the potential risk of traffic congestion caused by unexpected network failures based on the reduced topology during off-peak time, we further propose a robust TLS scheme with Single Link Failure Protection (TLS-SLFP) which aims to achieve an optimized trade-off between network robustness and energy efficiency performance.
- . (2012) 'Local Mobility Management for Networked Femtocells Based on X2 Traffic Forwarding'. IEEE IEEE Transactions on Vehicular Technology,
- . (2011) 'Managing the future internet through intelligent in-network substrates'. IEEE IEEE Network, 25 (6), pp. 34-40.
- . (2009) 'Joint optimization of intra- and inter-autonomous system traffic engineering'. IEEE Transactions on Network and Service Management, 6 (2), pp. 64-79.
- . (2007) 'Traffic engineered multicast content delivery without MPLS overlay'. IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC IEEE TRANSACTIONS ON MULTIMEDIA, 9 (3), pp. 619-628.
Journal articles
- . (2012) 'A survey of power-saving techniques on data centers and content delivery networks'. IEEE COMMUNICATIONS SURVEYS & TUTORIALS,
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(2012) 'Internet-scale content mediation in information-centric networks'. Springer Annals of Telecommunications, Full text is available at: http://epubs.surrey.ac.uk/730264/
Abstract
Given that the vast majority of Internet interactions relate to content access and delivery, recent research has pointed to a potential paradigm shift from the current host-centric Internet model to an information-centric one. In information-centric networks, named content is accessed directly, with the best content copy delivered to the requesting user given content caching within the network. Here, we present an Internet-scale mediation approach for content access and delivery that supports content and network mediation. Content characteristics, server load, and network distance are taken into account in order to locate the best content copy and optimize network utilization while maximizing the user quality of experience. The content mediation infrastructure is provided by Internet service providers in a cooperative fashion, with both decoupled/two-phase and coupled/one-phase modes of operation. We present in detail the coupled mode of operation which is used for popular content and follows a domain-level hop-by-hop content resolution approach to optimally identify the best content copy. We also discuss key aspects of our content mediation approach, including incremental deployment issues and scalability. While presenting our approach, we also take the opportunity to explain key information-centric networking concepts.
- . (2012) 'A two-dimensional architecture for end-to-end resource management in virtual network environments'. IEEE Network, 26 (5), pp. 8-14.
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(2012) 'Optimizing Link Sleeping Reconfigurations in ISP Networks with Off-Peak Time Failure Protection'. IEEE IEEE Transactions on Network and Service Management, (99), pp. 1-13.Full text is available at: http://epubs.surrey.ac.uk/738895/
Abstract
Energy consumption in ISP backbone networks has been rapidly increasing with the advent of increasingly bandwidth-hungry applications. Network resource optimization through sleeping reconfiguration and rate adaptation has been proposed for reducing energy consumption when the traffic demands are at their low levels. It has been observed that many operational backbone networks exhibit regular diurnal traffic patterns, which offers the opportunity to apply simple time-driven link sleeping reconfigurations for energy-saving purposes. In this work, an efficient optimization scheme called Time-driven Link Sleeping (TLS) is proposed for practical energy management which produces an optimized combination of the reduced network topology and its unified off-peak configuration duration in daily operations. Such a scheme significantly eases the operational complexity at the ISP side for energy saving, but without resorting to complicated online network adaptations. The GÉANT network and its real traffic matrices were used to evaluate the proposed TLS scheme. Simulation results show that up to 28.3% energy savings can be achieved during off-peak operation without network performance deterioration. In addition, considering the potential risk of traffic congestion caused by unexpected network failures based on the reduced topology during off-peak time, we further propose a robust TLS scheme with Single Link Failure Protection (TLS-SLFP) which aims to achieve an optimized trade-off between network robustness and energy efficiency performance.
- . (2012) 'Local Mobility Management for Networked Femtocells Based on X2 Traffic Forwarding'. IEEE IEEE Transactions on Vehicular Technology,
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(2012) 'AMPLE: An adaptive traffic engineering system based on virtual routing topologies'. IEEE IEEE Communications Magazine, 50 (3), pp. 185-191.Full text is available at: http://epubs.surrey.ac.uk/711606/
Abstract
Handling traffic dynamics in order to avoid network congestion and subsequent service disruptions is one of the key tasks performed by contemporary network management systems. Given the simple but rigid routing and forwarding functionalities in IP base environments, efficient resource management and control solutions against dynamic traffic conditions is still yet to be obtained. In this article, we introduce AMPLE - an efficient traffic engineering and management system that performs adaptive traffic control by using multiple virtualized routing topologies. The proposed system consists of two complementary components: offline link weight optimization that takes as input the physical network topology and tries to produce maximum routing path diversity across multiple virtual routing topologies for long term operation through the optimized setting of link weights. Based on these diverse paths, adaptive traffic control performs intelligent traffic splitting across individual routing topologies in reaction to the monitored network dynamics at short timescale. According to our evaluation with real network topologies and traffic traces, the proposed system is able to cope almost optimally with unpredicted traffic dynamics and, as such, it constitutes a new proposal for achieving better quality of service and overall network performance in IP networks.
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(2011) 'Disruption-Free Green Traffic Engineering with NotVia Fast Reroute'. IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC IEEE COMMUNICATIONS LETTERS, 15 (10), pp. 1123-1125.Full text is available at: http://epubs.surrey.ac.uk/711608/
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(2011) 'Curling: Content-ubiquitous resolution and delivery infrastructure for next-generation services'. IEEE IEEE Communication Magazine, 49 (3), pp. 112-120.Full text is available at: http://epubs.surrey.ac.uk/711607/
Abstract
CURLING, a Content-Ubiquitous Resolution and Delivery Infrastructure for Next Generation Services, aims to enable a future content-centric Internet that will overcome the current intrinsic constraints by efficiently diffusing media content of massive scale. It entails a holistic approach, supporting content manipulation capabilities that encompass the entire content life cycle, from content publication to content resolution and, finally, to content delivery. CURLING provides to both content providers and customers high flexibility in expressing their location preferences when publishing and requesting content, respectively, thanks to the proposed scoping and filtering functions. Content manipulation operations can be driven by a variety of factors, including business relationships between ISPs, local ISP policies, and specific content provider and customer preferences. Content resolution is also natively coupled with optimized content routing techniques that enable efficient unicast and multicast- based content delivery across the global Internet.
- . (2011) 'Managing the future internet through intelligent in-network substrates'. IEEE IEEE Network, 25 (6), pp. 34-40.
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(2009) 'The AGAVE approach for network virtualization: differentiated services delivery'. SPRINGER FRANCE ANNALES DES TELECOMMUNICATIONS-ANNALS OF TELECOMMUNICATIONS, 64 (5-6), pp. 277-288.Full text is available at: http://epubs.surrey.ac.uk/711569/
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(2008) 'An overview of routing optimization for Internet traffic engineering'. IEEE Communications Surveys and Tutorials, 10 (1), pp. 36-56.Full text is available at: http://epubs.surrey.ac.uk/1819/
- . (2007) 'Inter-autonomous system provisioning for end-to-end bandwidth guarantees'. ELSEVIER SCIENCE BV COMPUTER COMMUNICATIONS, 30 (18), pp. 3757-3777.
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(2007) 'A framework for end-to-end service differentiation: Network planes and parallel internets'. IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC IEEE COMMUNICATIONS MAGAZINE, 45 (9), pp. 134-143.Full text is available at: http://epubs.surrey.ac.uk/1670/
- . (2007) 'Traffic engineered multicast content delivery without MPLS overlay'. IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC IEEE TRANSACTIONS ON MULTIMEDIA, 9 (3), pp. 619-628.
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(2007) 'Interdomain routing through QoS-class planes'. IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC IEEE COMMUNICATIONS MAGAZINE, 45 (2), pp. 88-95.Full text is available at: http://epubs.surrey.ac.uk/1855/
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(2006) 'End-to-end quality of service provisioning through inter-provider traffic engineering'. ELSEVIER SCIENCE BV COMPUTER COMMUNICATIONS, 29 (6), pp. 683-702.Full text is available at: http://epubs.surrey.ac.uk/59959/
Conference papers
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(2012) 'An ISP and end-user cooperative intradomain routing algorithm'. IEEE Cappadocia, Turkey: IEEE Symposium on Computers and Communications, pp. 000289-000294.Full text is available at: http://epubs.surrey.ac.uk/727755/
Abstract
The continuous growth in volume of Internet traffic, including VoIP, IPTV and user-generated content, requires improved routing mechanisms that satisfy the requirements of both the Internet Service Providers (ISPs) that manage the network and the end-users that are the sources and sinks of data. The objectives of these two players are different, since ISPs are typically interested in ensuring optimised network utilisation and high throughput whereas end-users might require a low-delay or a high-bandwidth path. In this paper, we present our UAESR (Utilisation-Aware Edge Selected Routing) algorithm, which aims to satisfy both players' demands concurrently by selecting paths that are a good compromise between the two players' objectives. We demonstrate by simulation that this algorithm allows both actors achieve their goals. The results support our argument that our cooperative approach achieves effective network resource engineering at the same time as offering routing flexibility and good quality of service to end-users.
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(2012) 'DACoRM: A coordinated, decentralized and adaptive network resource management scheme'. IEEE Proceedings of the 2012 IEEE Network Operations and Management Symposium, NOMS 2012, 2012 IEEE Network Operations and Management Symposium, NOMS 2012, pp. 417-425.Full text is available at: http://epubs.surrey.ac.uk/766217/
Abstract
In order to meet the requirements of emerging demanding services, network resource management functionality that is decentralized, flexible and adaptive to traffic and network dynamics is of paramount importance. In this paper we describe the main mechanisms of DACoRM, a new intra-domain adaptive resource management approach for IP networks. Based on path diversity provided by multi-topology routing, our approach controls the distribution of traffic load in the network in an adaptive manner through periodical re-configurations that uses real-time monitoring information. The re-configuration actions performed are decided in a coordinated fashion between a set of source nodes that form an in-network overlay. We evaluate the overall performance of our approach using realistic network topologies. Results show that near-optimal network performance in terms of resource utilization can be achieved in scalable manner. © 2012 IEEE.
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(2012) 'Optimization for time-driven link sleeping reconfigurations in ISP backbone networks'. IEEE Proceedings of the 2012 IEEE Network Operations and Management Symposium, NOMS 2012, Hawaii, USA: NOMS 2012, pp. 221-228.Full text is available at: http://epubs.surrey.ac.uk/726219/
Abstract
Backbone network energy efficiency has recently become a primary concern for Internet Service Providers and regulators. The common solutions for energy conservation in such an environment include sleep mode reconfigurations and rate adaptation at network devices when the traffic volume is low. It has been observed that many ISP networks exhibit regular traffic dynamicity patterns which can be exploited for practical time-driven link sleeping configurations. In this work, we propose a joint optimization algorithm to compute the reduced network topology and its actual configuration duration during daily operations. The main idea is first to intelligently remove network links using a greedy heuristic, without causing network congestion during off-peak time. Following that, a robust algorithm is applied to determine the window size of the configuration duration of the reduced topology, making sure that a unified configuration with optimized energy efficiency performance can be enforced exactly at the same time period on a daily basis. Our algorithm was evaluated using on a Point-of-Presence representation of the GÉANT network and its real traffic matrices. According to our simulation results, the reduced network topology obtained is able to achieve 18.6% energy reduction during that period without causing significant network performance deterioration. The contribution from this work is a practical but efficient approach for energy savings in ISP networks, which can be directly deployed on legacy routing platforms without requiring any protocol extension. © 2012 IEEE.
- . (2012) 'Spraying the replication probability with geographic assistance for Delay Tolerant Networks'. IEEE International Conference on Communications, , pp. 2844-2849.
- . (2012) 'Optimizing server power consumption in cross-domain content distribution infrastructures'. IEEE International Conference on Communications, , pp. 2628-2633.
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(2012) 'Routing on demand: Toward the energy-aware traffic engineering with OSPF'. Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics), 7289 LNCS (PART 1), pp. 232-246.Full text is available at: http://epubs.surrey.ac.uk/766213/
Abstract
Energy consumption has already become a major challenge to the current Internet. Most researches aim at lowering energy consumption under certain fixed performance constraints. Since trade-offs exist between network performance and energy saving, Internet Service Providers (ISPs) may desire to achieve different Traffic Engineering (TE) goals corresponding to changeable requirements. The major contributions of this paper are twofold: 1) we present an OSPF-based routing mechanism, Routing On Demand (ROD), that considers both performance and energy saving, and 2) we theoretically prove that a set of link weights always exists for each trade-off variant of the TE objective, under which solutions (i.e., routes) derived from ROD can be converted into shortest paths and realized through OSPF. Extensive evaluation results show that ROD can achieve various trade-offs between energy saving and performance in terms of Maximum Link Utilization, while maintaining better packet delay than that of the energy-agnostic TE. © 2012 IFIP International Federation for Information Processing.
- . (2012) 'Will the three-network convergence happen? An evolution model based analysis'. 2012 1st IEEE International Conference on Communications in China, ICCC 2012, , pp. 149-154.
- . (2012) 'Replication routing for delay tolerant networking: A hybrid between utility and geographic approach'. IEEE Wireless Communications and Networking Conference, WCNC, , pp. 2751-2756.
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(2011) 'Towards decentralized and adaptive network resource management'. 2011 7th International Conference on Network and Service Management, Paris, France: 7th CNSM, pp. 1-6.Full text is available at: http://epubs.surrey.ac.uk/726183/
Abstract
Current practices for managing resources in fixed networks rely on off-line approaches, which can be sub-optimal in the face of changing or unpredicted traffic demand. To cope with the limitations of these off-line configurations new traffic engineering (TE) schemes that can adapt to network and traffic dynamics are required. In this paper, we propose an intra-domain dynamic TE system for IP networks. Our approach uses multi-topology routing as the underlying routing protocol to provide path diversity and supports adaptive resource management operations that dynamically adjust the volume of traffic sent across each topology. Re-configuration actions are performed in a coordinated fashion based on an in-network overlay of network entities without relying on a centralized management system. We analyze the performance of our approach using a realistic network topology, and our results show that the proposed scheme can achieve near-optimal network performance in terms of resource utilization in a responsive manner.
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(2011) 'An empirical study on the interactions between ALTO-assisted P2P overlays and ISP networks'. IEEE 2011 IEEE 36th Conference on Local Computer Networks (LCN), Bonn, Germany: 4th IEEE Workshop on Wireless and Internet Services, pp. 719-726.Full text is available at: http://epubs.surrey.ac.uk/107401/
Abstract
The recently proposed Application Layer Traffic Optimization (ALTO) framework has opened up a new dimension for Internet traffic management that is complementary to the traditional application-agnostic traffic engineering (AATE) solutions currently employed by ISPs. In this paper, we investigate how ALTO-assisted Peer-to-Peer (P2P) traffic management functions interact with the underlying AATE operations, given that there may exist different application-layer policies in the P2P overlay. By considering specific P2P peer selection behaviors on top of a traffic-engineered ISP network, we conduct a performance analysis on how the application and network-layer respective performance is influenced by different policies at the P2P side. Our empirical study offers significant insight for the future design and analysis of cross-layer network engineering approaches that involve multiple autonomous optimization entities with both consistent and non-consistent policies.
- . (2011) 'COMET: Content mediator architecture for content-aware networks'. 2011 Future Network and Mobile Summit, Warsaw, Poland: Future Network Summit 2011
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(2011) 'Shared backup network provision for virtual network embedding'. IEEE International Conference on Communications, Full text is available at: http://epubs.surrey.ac.uk/125674/
Abstract
Network virtualization has been recognized as a promising solution to enable the rapid deployment of customized services by building multiple Virtual Networks (VNs) on a shared substrate network. Whereas various VN embedding schemes have been proposed to allocate the substrate resources to each VN requests, little work has been done to provide backup mechanisms in case of substrate network failures. In a virtualized infrastructure, a single substrate failure will affect all the VNs sharing that resource. Provisioning a dedicated backup network for each VN is not efficient in terms of substrate resource utilization. In this paper, we investigate the problem of shared backup network provision for VN embedding and propose two schemes: shared on-demand and shared pre-allocation backup schemes. Simulation experiments show that both proposed schemes make better utilization of substrate resources than the dedicated backup scheme without sharing, while each of them has its own advantages. © 2011 IEEE.
- . (2011) 'Adaptive post-failure load balancing in fast reroute enabled IP networks'. Proceedings of the 12th IFIP/IEEE International Symposium on Integrated Network Management, IM 2011, , pp. 470-477.
- . (2011) 'An empirical study on the interactions between ALTO-assisted P2P overlays and ISP networks'. Proceedings - Conference on Local Computer Networks, LCN, Bonn, Germany: IEEE 36th Conference on Local Computer Networks, LCN 2011, pp. 719-726.
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(2010) 'On the interactions between non-cooperative P2P overlay and traffic engineering behaviors'. GLOBECOM - IEEE Global Telecommunications Conference, Full text is available at: http://epubs.surrey.ac.uk/29739/
Abstract
Emerging Peer-to-Peer (P2P) technologies have enabled various types of content to be efficiently distributed over the Internet. Most P2P systems adopt selfish peer selection schemes in the application layer that in some sense optimize the user quality of experience. On the network side, traffic engineering (TE) is deployed by ISPs in order to achieve overall efficient network resource utilization. These TE operations are typically performed without distinguishing between P2P flows and other types of traffic. Due to inconsistent or even conflicting objectives from the perspectives of P2P overlay and network-level TE, the interactions between the two and their impact on the performance for each is likely to be non-optimal, and also has not yet been investigated in detail. In this paper we study such non-cooperative interactions by modeling best-reply dynamics, in which the P2P overlay and network-level TE optimize their own strategies based on the decision of the other player in the previous round. According to our simulations results based on data from the ABILENE network, P2P overlays exhibit strong resilience to adverse TE operations in maintaining end-to-end performance at the application layer. In addition, we show that network-level TE may suffer from performance deterioration caused by greedy peer (re-)selection behavior in reacting to previous TE adjustments. ©2010 IEEE.
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(2010) 'Link weight optimization for enhancing IP resilience using multi-plane routing'. Proceedings - IEEE Symposium on Computers and Communications, , pp. 899-905.Full text is available at: http://epubs.surrey.ac.uk/29738/
Abstract
With the increasing importance of the Internet for delivering personal and business applications, the slow re-convergence after network failure of existing routing protocols becomes a significant problem. This is especially true for real time multimedia services where service disruption cannot be generally tolerated. In order to ensure fast network failure recovery, IP Fast Reroute (FRR) can be adopted to immediately reroute affected customer traffic from the default path onto a backup path when link failure occurs, thus avoiding slow Interior Gateway Protocol (IGP) re-convergence. We notice that IGP link weight setting plays an important role in influencing the protection coverage performance in intra-domain link failures. Therefore in this paper we present an IGP link weight optimization scheme for backup path provisioning, which works on top of a multi-plane enabled routing platform. The scheme aims to optimize the path diversity among multiple routing planes. Due to the large search space of possible intra-domain link weights, in this paper we adopted a global search method based on a Genetic Algorithm to optimize the IGP link weights. Evaluation results show that in most cases a set of optimal link weights can be found which ensures that there are no more critical shared links among all the diverse paths on each routing plane. As a result, backup paths can be always available in case of single link failures. © 2010 IEEE.
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(2010) 'A dynamic peer-to-peer traffic limiting policy for ISP networks'. Proceedings of the 2010 IEEE/IFIP Network Operations and Management Symposium, NOMS 2010, , pp. 317-324.Full text is available at: http://epubs.surrey.ac.uk/71156/
Abstract
As a scalable paradigm for content distribution at Internet-wide scale, Peer-to-Peer (P2P) technologies have enabled a variety of networked services, such as distributed file-sharing and live video streaming. Most existing P2P systems employ nonintelligent peer selection algorithms for content swarming which greedily consume Internet bandwidth resources. As a result, Internet service providers (ISPs) need some efficient solutions for managing P2P traffic within their own networks. A common practice today is to block or shape P2P traffic in order to conserve bandwidth resources for carrying standard traffic from which revenue can be generated. In this paper, instead of looking at simple time-driven blocking/limiting approaches, we investigate how such types of limiting behaviors can be more gracefully performed by the ISP by taking into account the dynamics of both P2P traffic and of standard Internet traffic. Specifically, our approach is to adaptively limit excessive P2P traffic on critical network links that are prone to congestion, based on periodical link load/utilization measurements by the ISP. The ultimate objective is to guarantee non-P2P service capability while trying to accommodate as much P2P traffic as possible based on the available bandwidth resources. This approach can be regarded as a complementary solution to the recently proposed collaboration-based P2P paradigms such as P4P. Simulation results show that our approach not only eliminates performance degradation of non-P2P services that are caused by overwhelming P2P traffic, but also accommodates P2P traffic efficiently in both existing and future collaboration-based P2P network scenarios. ©2010 IEEE.
- . (2010) 'Policy-Aware Virtual relay placement for inter-domain path diversity'. Proc. IEEE Symp. Computers and Communications (ISCC), , pp. 38-43.
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(2010) 'Fast failure recovery for reliable multicast-based content delivery'. Proceedings of the 2010 International Conference on Network and Service Management, CNSM 2010, , pp. 505-510.Full text is available at: http://epubs.surrey.ac.uk/766215/
Abstract
In this paper we introduce a new scheme to achieve fast failure recovery in IP multicast based content delivery, which is based on efficient extensions to the Not-via fast reroute (FRR) technique. The design of such an approach takes into account distinct characteristics of IP multicast routing, namely receiver-initiated and state-based, and it offers comprehensive protections against both simple and complex network failures. We also specify in the paper moderate extensions to the standard PIM-SM routing protocol in order to equip individual repairing routers with necessary knowledge for dynamically binding protected multicast trees with pre-established Not-via tunnels that are able to automatically bypass failed network components. Our simulation experiments based on both real and synthetically generated topologies indicate promising scalability performance in the proposed multicast FRR approach. © 2010 IEEE.
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(2009) 'Fast network failure recovery using multiple BGP routing planes'. GLOBECOM - IEEE Global Telecommunications Conference, Full text is available at: http://epubs.surrey.ac.uk/30851/
Abstract
We present an efficient multi-plane based fast network failure recovery scheme which can be realized using the recently proposed multi-path enabled BGP platforms. We mainly focus on the recovery scheme that takes into account BGP routing disruption avoidance at network boundaries, which can be caused by intra-AS failures due to the hot potato routing effect. On top of this scheme, an intelligent IP crank-back operation is also introduced for further enhancement of network protection capability against failures. Our simulations based on both real operational network topologies and synthetically generated ones suggest that, through our proposed optimized backup egress point selection algorithm, as few as two routing planes are able to achieve high degree of path diversity for fast recovery in any single link failure scenario.
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(2009) 'An adaptive peer selection scheme with dynamic network condition awareness'. IEEE International Conference on Communications, Full text is available at: http://epubs.surrey.ac.uk/71159/
Abstract
Locality-based peer selection paradigms have been proposed recently based on cooperation between peer-to-peer (P2P) service providers, Internet Service Providers (ISPs) and end users in order to achieve efficient resource utilization by P2P traffic. Based on this cooperation between different stakeholders, we introduce a more advanced paradigm with adaptive peer selection that takes into account traffic dynamics in the operational network. Specifically, peers associated with low path utilization as measured by the ISP are selected in order to reduce the probability of network congestion. This approach not only improves real-time P2P service assurance but also optimizes the overall use of network resources. Our simulations based on the GEANT network topology and real traffic traces show that the proposed adaptive peer selection scheme achieves significant improvement in utilizing bandwidth resources as compared to static locality-based approaches. ©2009 IEEE.
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(2009) 'A New Approach for Achieving Traffic-Exchange Localization in P2P-based Content Distribution'. IEEE 2009 INTERNATIONAL CONFERENCE ON TELECOMMUNICATIONS (ICT), Marrakech, MOROCCO: 16th International Conference on Telecommunications (ICT), pp. 59-64.Full text is available at: http://epubs.surrey.ac.uk/31427/
- . (2008) 'Resource management and signalling architecture of a hybrid multicast service for multimedia distribution'. Lecture Notes in Computer Science: Management of Converged Multimedia Networks and Services, Samos Island, Greece: MMNS 2008: 11th IFIP/IEEE International Conference on Management of Multimedia and Mobile Networks and Services 5274, pp. 39-51.
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(2008) 'Making IP traffic engineering robust to intra- and inter-AS transient link failures'. IEEE 2008 IEEE NETWORK OPERATIONS AND MANAGEMENT SYMPOSIUM, VOLS 1 AND 2, Salvador, BRAZIL: IEEE Network Operations and Management Symposium, pp. 81-88.Full text is available at: http://epubs.surrey.ac.uk/60779/
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(2008) 'Adaptive multi-topology IGP based traffic engineering with near-optimal network performance'. SPRINGER-VERLAG BERLIN NETWORKING 2008: AD HOC AND SENSOR NETWORKS, WIRELESS NETWORKS, NEXT GENERATION INTERNET, PROCEEDINGS, Singapore, SINGAPORE: 7th International IFIP-TC6 Networking Conference 4982, pp. 654-666.Full text is available at: http://epubs.surrey.ac.uk/766216/
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(2008) 'Achieving Fast BGP Reroute with Traffic Engineering Using Multiple Routing Planes'. SPRINGER-VERLAG BERLIN IP OPERATIONS AND MANAGEMENT, PROCEEDINGS, Samos, GREECE: 8th IEEE International Workshop on IP Operations and Management 5275, pp. 41-52.Full text is available at: http://epubs.surrey.ac.uk/727763/
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(2007) 'A framework for lightweight QoS provisioning: Network planes and parallel Internets'. IEEE 2007 10TH IFIP/IEEE INTERNATIONAL SYMPOSIUM ON INTEGRATED NETWORK MANAGEMENT (IM 2009), VOLS 1 AND 2, Munich, GERMANY: 10th IFIP/IEEE International Symposium on Integrated Network Management, pp. 797-800.Full text is available at: http://epubs.surrey.ac.uk/2278/
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(2006) 'Joint Optimization of Intra- and Inter-Autonomous System Traffic Engineering'. IEEE 2006 IEEE/IFIP NETWORK OPERATIONS AND MANAGEMENT SYMPOSIUM, VOLS 1 AND 2, Vancouver, CANADA: IEEE/IFIP Network Operations and Management Symposium, pp. 248-259.Full text is available at: http://epubs.surrey.ac.uk/719210/
- . (2006) 'An efficient IP based approach for multicast routing optimisation in multi-homing environments'. IEEE 2006 2nd Conference on Next Generation Internet Design and Engineering, Univ Politecn Valencia, Valencia, SPAIN: 2nd Conference on Next Generation Internet Design and Engineering, pp. 379-386.
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(2005) 'Two approaches to Internet traffic engineering for end-to-end quality of service provisioning'. IEEE Rome: 1st EuroNGI Conference on Next Generation Internet Networks - Traffic EngineeringFull text is available at: http://epubs.surrey.ac.uk/719428/
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(2004) 'An incentive-based quality of service aware algorithm for offline inter-AS traffic engineering'. IEEE 2004 IEEE Workshop on IP Operations and Management Proceedings (IPOM 2004), Beijing, PEOPLES R CHINA: IEEE International Workshop on IP Operations and Management, pp. 34-40.Full text is available at: http://epubs.surrey.ac.uk/2061/
Books
- . (2011) Recent Advances in Providing Qos and Reliability in the Future Internet Backbone. Nova Publishers
Book chapters
- . (2011) 'Performance Measurement and Optimization for Relative QoS of Multiparty Communications'. in Wang N (ed.) Recent Advances in Providing QoS and Reliability in the Future Internet Backbone Nova Publishers Article number 4 , pp. 57-72.
Teaching
- LDPS III/IV (Level 2): Laboratories, Design and Professional Studies
- EEEM023 (Level M): Network and Service Management and Control
- COMM007 (Level M in the Department of Computing): Network Technologies and Security
