Jiann-Liang Chen

Architecture design and performance evaluation of RFID object tracking systems

The network architecture of an RFID system affects the operating performance and scalability of the entire system. The related researches about RFID system could be made easier as the bridge-based and the gateway-based network architecture. This study considers a scenario for an RFID object tracking system designs a hierarchical RFID network system and evaluates the operating performance of different RFID system architectures. The results of performance evaluations demonstrate that the proposed hierarchical RFID network architecture reduces the network and database system loading by 41.8% and 83.2%, respectively. The operation of RFID object tracking over the hierarchical network architecture is indicated to be highly efficient and scalable.

Android/OSGi-based vehicular network management system

With the enormous market potential of the telematics industry and the rapid development of information technology, automotive telematics has attracted considerable attention for mobile computing and intelligent transport systems (ITSs). This study integrates the Open Gateway Service Initiative Vehicle Expert Group (OSGi/VEG) into an Android platform to generate a vehicular Android/OSGi platform that has the advantages of both original platforms. These features include remote management, rich class sharing, proprietary vehicular applications, security policies, easy management of application programming interface (APIs), and an open environment. This study also integrates a cloud computing mechanism into the Android/OSGi platform, allowing service providers to upload their telematics bundles onto storage clouds using a provisioning server. A management agent in the Android/OSGi platform can simultaneously update its application service modules using remote storage clouds and use visual intelligence to continually change the distinguishing features of applications based on context awareness without user intervention. To assess the feasibility of the proposed Android/OSGi platform, this study presents a vehicular testbed to determine the functionalities of different telematics applications. Android/OSGi platform applications require less memory and system resources than those on the original Android platform when performing complicated operations. Additionally, the Android/OSGi platform launches telematics services more quickly than the original Android platform. The proposed platform overcomes the problem of frequent non-responsive exceptions in the original Android platform.

IMS cloud computing architecture for high-quality multimedia applications

A novel IP Multimedia Subsystem (IMS) framework with cloud computing architecture is proposed for use in high-quality multimedia applications. The IMS supports heterogeneous networking with Quality-of-Service (QoS) policy. MapReduce analysis is also used to enhance cloud computing capability. This architecture enables users to access high-quality multimedia applications via Android-based appliances. In this study, the IMS QoS policies of three wireless access technologies, 3G, WiFi and WiMAX, are integrated in a cloud computing environment to provide different services such as VoIP services and video streaming services. Experimental results indicate that the proposed mechanism improves system performance by allocating resources according to service priority. The proposed architecture also significantly improves system capacity to accommodate numerous users.

Cross-layer and cognitive QoS management system for next-generation networking

Owing to limited wireless network resources, network applications must provide an adaptive quality-guaranteed service to satisfy user requirements. Different applications are associated with different quality of service (QoS) concerns, as well as different QoS control parameters. This work presents an adaptive QoS algorithm by discussing the QoS specifications of three wireless access technologies, i.e. 3G, WiMAX and WiFi. Based on cross-layer and cognition concepts, these environmental parameters are integrated with the sensing of spectral and received signal strength from a cognitive radio paradigm. An adaptive QoS algorithm is then proposed to select the optimal access network for services. Simulation results indicate that the proposed adaptive QoS algorithm outperforms available ones in real-time applications. Compared with traditional algorithms, the proposed algorithm reduces not only the average delay time and jitter for VoIP services to 0.16 s and 0.09 ms, respectively, but also the packet loss ratio for high-definition video streaming by 3.4%. Copyright

Internet of Things and Cloud Computing for Future Internet

Currently, Internet of Things (IoT) and Cloud Computing are the hottest issues of Future Internet. The IoT is the most important concept of Future Internet for providing a common global IT Platform to combine seamless networks and networked things. Cloud Computing provides backend solution for processing huge data streams and computations while facing the challenges of everything will be connected with seamless networks in the future. However, there is a lack of common fabric for integrating IoT and Cloud. In telecommunications, the IMS (IP Multimedia Subsystem) based on the All-IP and Open Services Architecture has been regarded as the trend for Next Generation Network (NGN). We believe that the IMS communication platform is the most suitable fabric for integrating IoT and Cloud. In this study, we will provide the discussion of open challenges and possible solutions for Future Internet.

Challenges to Next Generation Services in IP Multimedia Subsystem

The trend of Next Generation Networks’ (NGN) evolution is towards providing multiple and multimedia services to users through ubiquitous networks. The aim of IP Multimedia Subsystem (IMS) is to integrate mobile communication networks and computer networks. The IMS plays an important role in NGN services, which can be achieved by heterogeneous networks and different access technologies. IMS can be used to manage all service related issues such as Quality of Service (QoS), Charging, Access Control, User and Services Management. Nowadays, internet technology is changing with each passing day. New technologies yield new impact to IMS. In this paper, we perform a survey of IMS and discuss the different impacts of new technologies on IMS such as P2P, SCIM, Web Service and its security issues. Keywords—IP Multimedia Subsystems, Peer-to-Peer, Web Services, SCIM

Mobile cloud computing service based on heterogeneous wireless and mobile P2P networks

In this paper, an investigation toward mobile P2P architecture brings a new insight to realize future mobile cloud computing systems. Although mobile devices capacity in storing data and running computational process is very limited, the main problem for implementing mobile cloud computing environment is still motivated by the classic issue of information properties query process. Heterogeneous wireless networks (HWNs) architecture then exploited to solve this fundamental problem. The HWNs information properties dispersion model based on coverage area of mobile node aid to simplify the querying process. By HWN and mobile P2P integration a reliable mobile cloud computing service can perform services and resources exchange among peer nodes. In addition this integrated architecture gives the extension of mobile P2P into Network as a Service (NaaS) approach to resource sharing among mobile users.

Performance investigation of IPv4/IPv6 transition mechanisms

1Pv4/1Pv6 transition always occurs process in deploying 1Pv6-based services across the 1Pv4 Internet. The IETF Next Generation Transition Working Group (NGtrans) has proposed many transition mechanisms to enable the seamless integration of 1Pv6 facilities into current networks. This work mainly addresses the performance of the various tunneling transition mechanisms used in different networks. The effect of these mechanisms on the performance of end-to-end applications is explored using metrics such as transmission latency, throughput, CPU utilization and packet loss. The measured latency and throughput of the 6to4 mechanism are better than those of the configured tunnel and tunnel broker mechanisms by 89.38% and 94.83%, 42.47% and 48.76%. However, the 6to4 mechanism must work much harder (greater overhead) for each packet sent, and it must therefore run at a higher CPU utilization of the edge router. Larger packets had higher loss rates, for all three tunneling mechanisms.

All-IP convergent communications over open service architecture

The application of IP (Internet Protocol) technology in the information and communications industry is a major global trend. A highly efficient service architecture, enabling technologies and advanced applications are critical to rapid multimedia services in an all-IP network environment. In this study, an all-IP service platform based on open service architecture (OSA) was developed to support a set of standard interfaces and applications. The all-IP network environment was integrated using a network-processor-based IPv4/IPv6 translator and a mobile router (MR) supporting IP network mobility. The feasibility of the open service platform for all-IP network environments and of the designed application programming interfaces was investigated using three applications, e-commerce, video-on-demand and on-line gaming. The performance analysis demonstrates that when the number of users was increased from 1 to 80, the system throughput increased from 10.5 Mbps to 60.5 Mbps; the average response time increased from approximately 1 ms to 10.5 ms, and the delay time increased from 0.1 ms to 1 ms.

Resource allocation for cellular data services using multiagent schemes

Because the radio spectrum is limited, managing the limited amount of resources is an important issue, especially for high-speed data applications. This paper presents a distributed multiagent scheme (DMAS) that was developed for supporting resource allocation in a customer-accepted and cost-effective fashion. The scheme consists of a collection of problem-solving agents with three modules built into the scheme: the knowledge source, the blackboard system, and the control engine. Through operations and cooperation among the active agents, an allocation policy is selected and a customer-accepted schedule that meets the specified quality of service (QoS) is generated. A comparison of the performance between the DMAS scheme and other references previously proposed was derived using a 55 microcell model. It was found that the proposed scheme gave the highest quality of service satisfaction (around 90% at light loading and 60% at heavy loading).