Teck Kiong Lee

An Integrated Telecom and IT Service Delivery Platform

IP Multimedia Subsystem (IMS) and Web services (WS) are service-oriented architectures developed separately for service delivery in the next generation telecommunications, and IT-centric computing environment, respectively. In order to harness services in both of these platforms and to facilitate combining and blending of services, we propose an integrated telecom and IT Service Delivery Platform for interworking between IMS and WS. We propose to use SIP-based Micro Service Orchestration and Web service bus to seamlessly integrate IMS, WS and the underlying services. We further present an example of managing multimedia services over an Ethernet Passive Optical Networks (EPON) infrastructure to illustrate that the proposed Service Delivery Platform has the benefits of supporting rapid development and deployment of new converged multimedia services.

Multipath cross-layer service discovery (MCSD) for mobile ad hoc networks

In this paper, we propose and study how to provide multipath cross-layer service discovery (MCSD) for mobile ad hoc networks (MANETs). Cross-layer service discovery integrates service discovery into route discovery by taking advantage of network-layer topology information and routing message exchange. Multipath service discovery differs from multipath routing in that multipath service discovery can be either multipath from a client to a server or multipath from a client to multiple servers, depending on the policy used in service selection and invocation. Compared with the traditional unipath cross-layer service discovery (UCSD), MCSD performs better in terms of improving throughput, enhancing service availability and optimizing network-layer resources. However, as a new service discovery scheme, MCSD posts a lot of challenges, particularly in the process of service discovery and how to find the optimal multipath. Due to the complexity of the problem, we focus on double-path cross-layer service discovery (DCSD), a special and most important case of MCSD. We present a heuristic, called iDCSD, which can intelligently find the optimal routes out of the candidate paths from a client to a server and from a client to two servers by minimizing hop count in network layer. Extensive simulation results show that compared with UCSD, i) MCSD delivers better service availability; and ii) the proposed iDCSD leads to a better network-layer performance with reasonable computational complexity.

Reconfigurable Base Station Processing and Resource Allocation

A huge research and development effort is being spent to improve the radio resources usage considering different available and upcoming radio access technologies as well as the more flexible usage of frequencies. Within this context, terminals, network and management entities/functions are considered. The scope of this paper is to identify new functions to be provided by a multi-standard base station: ways to provide software re-configuration in a generic manner which takes into consideration different situations where this re-configuration may be triggered, including through dynamic and self-adaptive means.

An IMS-Based Testbed for Service Innovations

In this paper, we introduce an IP Multimedia Subsystem (IMS) based testbed which provides a platform for service innovations. This open-source based testbed is built on the principle of Service Oriented Architecture (SOA), whereby system functionalities such as bandwidth management and video streaming are packaged as interoperable services, so that service providers can combine and reuse them through standard interfaces. A demonstration of new service creation through composition of the basic service components will also be reported herein.

An IMS-based testbed for real-time services integration and orchestration

In this paper, we introduce an IP Multimedia Sub-system (IMS) based testbed which provides a platform for the study of real-time services integration and orchestration. This open-source based testbed is built on the principle of Service Oriented Architecture (SOA), with an emphasis for real-time network services. We further developed service-oriented system functionalities such as optical network connection and bandwidth management, mobile client authentication protocols, and video streaming services. They are packaged as interoperable service components, so that they can be integrated and orchestrated through their respective standard interfaces. Finally, we elaborated our proof-of-concept environment via a use-case scenario of having various client-server interactions over a heterogeneous network environment.

A Service-oriented Optical Ethernet Network Design and Implementation

The paper presents a service-oriented optical Ethernet network design, which is based on a proposed integrated optical Ethernet network architecture. Through the introduction of a service plane, the service-oriented network enables various service compositions and is able to support carrier grade Ethernet transport services. The paper describes the design and implementation of an IMS based service plane, the service provisioning procedures, and shows experimental results of providing QoS stringent end-to-end Ethernet transport services through the service plane.

Policy-based orchestration of Web/IMS services

We discuss the creation and evaluation of an IP Multimedia Subsystem (IMS) based smartphone service that originally started as a web-only application. By using a simple policy framework, additional IMS-based services such as user registration, subscription, authentication and authorization are orchestrated with the web-based application via a general OMA-based service framework. This service plane further inter-works with lower layer IMS-based network control plane functions to provide network admission control and QoS control for users on EPON access network and mobile networks. The end result is that the original web-based application is now part of the converged network IP video service. Through this experiment, we have demonstrated the technical feasibility of using an OMA prescribed policy-based framework for combining web-based and IMS-based services. In particular, we have successfully carried out mobile-based service invocation and orchestration, and investigated the usage of the service plane functions in service provisioning over a heterogeneous network environment.

Online Content Delivery to Home Appliances

Internet streaming services like YouTube (free) and Netflix (paid) provide additional content sources to traditional IPTV services. Commonly accessed on computers, how these services can be enjoyed through home appliances such as TV sets is still unclear although there are early attempts. We propose to physically separate application functions such as content browsing and selection from content delivery functions so that (a) Web interfaces provided by the streaming sites can be reused (b) User input like typing can be less painful. We present the design of our proof-of-concept prototypes based on off-the-shelf components and discuss a possible path to Next-Generation Network (NGN) integration.

A Bandwidth Pre-allocation Scheme for `Beyond 3G' Multi-standard Base Station Using Measurement-based Admission Control

In a totally reconfigurable network, base stations can be viewed as amorphous entities that are dynamically configured to an optimal combination of radio access technologies based upon the time-varying user density and QoS requirements of the application traffic that they present or will present to it. In such a network, admission control is typically useful in providing load balancing and hotspot mitigation functionalities. In this paper, we propose to use a Measurement-based Admission Control (MBAC) to manage the allocation of baseband processing bandwidth in a multi-standard base station. Using realistic Voice and Video traffic traces, we highlight the MBAC performance in both homogeneous and heterogeneous traffic environments.