Michael Georgiades - Academia.edu (original) (raw)

Papers by Michael Georgiades

2015 10th International Conference on Broadband and Wireless Computing, Communication and Applications (BWCCA), 2015

VTC Spring 2008 - IEEE Vehicular Technology Conference, 2008

System Architecture Evolution (SAE) is one of the key challenges for the Long Term Evolution(LTE)... more System Architecture Evolution (SAE) is one of the key challenges for the Long Term Evolution(LTE) of 3G research, charted by 3GPP, aiming to develop a new core network for improving the IP based packet-switched network performance. This paper considers different mobility management schemes for different SAE core network architectural options proposed in 3GPP, and evaluates their performance according to signalling cost by using analytical modelling based on the random walk model. Our analysis shows that the mobility management performance of the different options on both Idle and Active mode. Regarding the architecture, options 2 and 3 have the best trade-off in total signalling cost performance in both modes and signalling load on each network node for system scalability. For mobility management, Proxy MIPv6 has shown that it is able to effectively reduce the signalling cost for mobility management for all architecture options.

Proceeding of the 2006 international conference on Communications and mobile computing - IWCMC '06, 2006

As the demand for multimedia and mobility services increases the tremendous growth in data traffi... more As the demand for multimedia and mobility services increases the tremendous growth in data traffic has forced the wireless industry to evolve towards all-IP networking. The overall aim of the all-IP network is the deployment of IP technology to support interworking regardless of means of access and services [1]. Ambient Networks aim to support this and embrace the heterogeneity arising from the different network control technologies such that it appears homogeneous to the potential users of network services [2]. The vision is to ...

This paper presents an End-to-End (E2E) Operations, Administration, and Maintenance (OAM) archite... more This paper presents an End-to-End (E2E) Operations, Administration, and Maintenance (OAM) architecture for Telco networks including a Sub-wavelength domain. It addresses two main issues: compatibility between MPLS networks and different Sub-wavelength technologies, and scalability of the OAM flows across the whole network. The case for OPST Sub-wavelength technology in the data plane has been studied extensively, however this is the first study on a methodology to scale the number of OAM flows in an E2E scenario combing both subwavelength and MPLS switching domains. Finally the inter-carrier issue in E2E OAM is also explored.

New security considerations arise if context transfer is to be employed in the Ambient Network ar... more New security considerations arise if context transfer is to be employed in the Ambient Network architecture. In this paper we investigate, new security requirements and considerations for context transfer in Ambient Networks, the transfer of security state information, the provisioning of security support of session mobility using context transfer, and finally an analysis of security issues of context transfer in homogeneous and heterogeneous environments.

Solutions for mobility management in wireless networks have been investigated and proposed in var... more Solutions for mobility management in wireless networks have been investigated and proposed in various research projects and standardization bodies. With the continuing deployment of different access networks, the wider range of applications tailored for a mobile environment, and a larger diversity of wireless end systems, it emerged that a single mobility protocol (such as Mobile IP) is not sufficient to handle the different requirements adequately. Thus a solution is needed to manage multiple mobility protocols in end systems and network nodes, to detect and select the required protocols, versions and optional features, and enable control on running daemons. For this purpose a mobility toolbox has been developed as part of the EU funded Ambient Networks project. This paper describes this modular management approach and illustrates the additional benefits a mobility protocol can gain by using state transfer as an example.

IEEE Communications Magazine, 2015

The current device-centric protection model against security threats has serious limitations. On ... more The current device-centric protection model against security threats has serious limitations. On the one hand, the proliferation of user terminals such as smart-phones, tablets, notebooks, smart TVs, game consoles and desktop computers makes it extremely difficult to achieve the same level of protection regardless of the device used. On the other hand, when various users share devices (e.g., parents and kids using the same devices at home), the set up of distinct security profiles, policies, and protection rules for the different users of a terminal is far from trivial. In light of this, this paper advocates for a paradigm shift in user protection. In our model, the protection is decoupled from the users' terminals, and it is provided by the access network through a Trusted Virtual Domain (TVD). Each TVD provides unified and homogeneous security for a single user, irrespective of the terminal employed. We describe a user-centric model, where non-technically savvy users can define their own profiles and protection rules in an intuitive way. We show that our model can harness from the virtualization power offered by nextgeneration access networks, especially, from Network Functions Virtualization (NFV) in the Points of Presence (POPs) at the edge of Telecom operators. We also analyze the distinctive features of our model, and the challenges faced based on the experience gained in the development of a proof-of-concept.

The all-IP based architecture for 3G networks and beyond will rely on a number of different acces... more The all-IP based architecture for 3G networks and beyond will rely on a number of different access technologies, working seamlessly to support numerous services and applications. Security provisioning is an essential requirement in any such all-embracing network but this introduces an additional delay component to the total handoff delay crucially affecting the prime objective towards seamless mobility. In this paper

The Handbook of Mobile Middleware, 2006

2011 18th International Conference on Telecommunications, 2011

This paper discusses the requirements and motivations for setting-up and utilizing two different ... more This paper discusses the requirements and motivations for setting-up and utilizing two different optical fiber test-beds both of a Telecom Operator as well as the UEssex/JANET Aurora field fiber testbed for optical metro networks research within the EU ICT MAINS project. Using both test-beds the MAINS project aims to evaluate its proposed mesh-ring topologies which feature innovative sub-wavelength switching nodes. Different research and technology attributes are considered for evaluation over the research and real commercial environments. The paper illustrates how the first test-bed scenario is designed to experimentally analyze multi-technology interoperability both at the data and control planes and how the second test-bed scenario with the use of a virtual PC application over sub-wavelength switching ring network aims to validate the proposed solutions with real customers and obtain supportive statistics and performance measures.

Research Letters in Communications, 2007

Several micromobility schemes have been proposed to augment Mobile IP and provide a faster and sm... more Several micromobility schemes have been proposed to augment Mobile IP and provide a faster and smoother handoff than what is achievable by Mobile IP alone, the majority of which can be categorized into either "network prefix-based" or "host-specific forwarding" mobility management protocols, depending on the routing method used. This letter proposes a mobility-aware routing protocol (MARP) which makes use of both of these routing methods using dynamic IP address allocation. Its performance is evaluated and compared against hierarchical Mobile IP (HMIP) and Cellular IP based on handoff performance, end-to-end delivery delay, and scalability. The results demonstrate that MARP is a more robust, flexible, and scalable micromobility protocol, minimizes session disruption, and offers improvements in handoff performance.

European Conference and Exhibition on Optical Communication, 2012

Abstract (40-Word Limit): This paper reports on the first user/application-driven multi-technolog... more Abstract (40-Word Limit): This paper reports on the first user/application-driven multi-technology optical sub-lambda intra/inter Data-Centre (DC) network demonstration. Extended GMPLS-PCE controls two heterogeneous intra-DC optical sub-lambda networks to deliver dynamic and guaranteed data transfer of ultra-low latency (&lt; 270µs) and jitter (&lt; 20µs) for end-to-end services

2013 IEEE SDN for Future Networks and Services (SDN4FNS), 2013

ABSTRACT Although cloud computing and the Software Defined Network (SDN) framework are fundamenta... more ABSTRACT Although cloud computing and the Software Defined Network (SDN) framework are fundamentally changing the way we think about network services, multi-domain and multi-technology problems are not sufficiently investigated. These multi-domain, end-to-end problems concern communication paths that span from the wireless access and the wireless backhaul networks to the IT resources through optical networks. In this paper we present the CONTENT project approach to network and infrastructure virtualization over heterogeneous, wireless and metro optical networks, that can be used to provide end-to-end cloud services. The project goal is to drive innovation across multi-technology infrastructures and allow ICT to be delivered and consumed as a service by Virtual Network Operators. The communication mechanics between wireless and optical domains and the physical layer abstractions of a CONTENT Virtual Network are presented and the relation of the proposed approach with the SDN framework is investigated.

2007 IEEE 65th Vehicular Technology Conference - VTC2007-Spring, 2007

Allowing a user to remain connected to the network whilst on the move is becoming a common requir... more Allowing a user to remain connected to the network whilst on the move is becoming a common requirement for any new communication system. The EU project Ambient Networks, therefore, considers mobility requirements and techniques in some depth. Two key ideas have been developed: the handover toolbox which contains and manages a variety of mobility protocols, handover techniques and, in particular, mobility optimisations; and the concept of routing groups, the establishment of which enables the mobility optimisations such as delegation of mobility management and aggregation of mobility signalling. In this paper we present these ideas and show how they are aligned with the Ambient Networks principles of being easily deployable, adaptable, and able to support heterogeneous network configurations.

Optics Express, 2013

This paper reports on the first user/application-driven multitechnology optical sub-wavelength ne... more This paper reports on the first user/application-driven multitechnology optical sub-wavelength network for intra/inter Data-Centre (DC) communications. Two DCs each with distinct sub-wavelength switching technologies, frame based synchronous TSON and packet based asynchronous OPST are interconnected by a WSON inter-DC communication. The intra/inter DC testbed demonstrates ultra-low latency (packet-delay <270µs and packet-delay-variation (PDV)<10µs) flexible data-rate traffic transfer by point-to-point, point-to-multipoint, and multipoint-to-(multi)point connectivity, highly suitable for cloud based applications and high performance computing (HPC). The extended GMPLS-PCE-SLAE based control-plane enables innovative applicationdriven end-to-end sub-wavelength path setup and resource reservation across the multi technology data-plane, which has been assessed for as many as 25 concurrent requests.