In this paper we will present concepts that are vital for the demonstration of vertically integrated Radio over fibre networks. We look at some of the technologies that are required to introduce complex network functions in the optical layer and discuss some of the issues that arise in the deployment of radio over-fibre networks. We explore the issues that are involved in the construction of dynamically reconfigurable radio-over-fibre networks.

Deploying a large number of small wireless sensors that can gather, process, and deliver information about physical environment to external systems opens many novel application domains. Today Wireless Sensor Networks (WSN) are highly interesting for different application domains such as military or healthcare [3]. Despite this interest, the integration of WSNs with business applications still raises technical challenges. WSN and context-aware middlewares aim at addressing this issue. Nevertheless, these middleware frameworks mainly focus on application development and deployment rather than on business application requirements. In this paper, we discuss the necessity of an Enterprise Integration Component (EIC) that addresses business application requirements. Combining top-down approach of contextaware middleware and bottom-up approach of WSN middleware, we propose the design of a SOA based architecture. The latter addresses the heterogeneity of WSNs and offers a standardized, secure and trusted way to access sensor data.

This paper presents a general-purpose API to P2P network middleware. The design proposes modular, service oriented solution to this problem. The paper demonstrates that while the proposed P2P API is fairly complex because it tries to support every known P2P technology, the footprint of the middleware can be quite small because of the modu- lar, incremental nature of the API middleware. The paper also demonstrates that although service-oriented API differs signifcantly from the traditional, monolithic APIs, it can be implemented in small footprint on top of a non service- oriented, commercial platform, the Series60.

As the IMS provides session establishment, QoS parameter negotiation, authentication and accounting it is an overlay architecture well qualified for session signaling concerning IPTV scenarios. The management of the signaling can be integrated as an application into an IPTV Application Server. The IPTV AS is further responsible for all necessary media signaling towards a proper IPTV media server. Such a media server is similar to the ordinary media server known from the voice centric IMS but additionally provides uni-cast, multicast and broadcast delivery of TV content which is placed by content providers. The media signaling requires a dedicated session description and can be provided by SIP or RTSP. The signaling between user and media server is orchestrated by a service-oriented-archietctue with a session manager acting as middleware. This middleware also provides interfaces for web services triggering IPTV session establishment via Parlay X gateway. This paper proposes a general IMS-based framework for delivering Live TV services over several access networks and presents the corresponding signaling flows for content enquiring and content switching as well as related delays. It furter presents an approach for using SIP and RTSP in cooperation for realizing VOD scenarios.

Virtual Machines (VMs) have been proposed as an efficient programming model forWireless Sensor Network (WSN) devices. However, the processing overhead required for VM execution has a signi ficant impact on the power consumption and battery lifetime of these devices. This paper describes the design of a hardware accelerator for Maté, a VM running on TinyOS. While faster execution speed is not important in the WSN applications, reduction in the number of clock cycles for performing the same task results in the lower duty cycle, which in turn saves the power consumption. With the dedicated data path, it is expected that the numbers of clock cycles can be reduced by one to two orders of magnitude compared to the software implementation of Maté.

As IMS matures, the industry and research institutes are steadily adopting IP Multimedia Subsystem (IMS) by building internal IMS playgrounds for prototyping and validation. From all the IMS components, the IMS User Equipment (UE) is a critical entity for the overall success in the IMS value chain. This is because, the UE is the only component that demonstrates IMS services found on the network, and the presentation of these services to the end-user will determine the return on investments on IMS. Early IMS service demonstrations are standalone solutions or support a limited set of basic services such as Voice over IP (VoIP), Presence and Messaging with little or no room for extensibility or reusability. The objective of this paper is to analyze and report our activities to develop an IMS client framework that provides intrinsic IMS functionalities and supports reusability, service composition/aggregation for seamless user experience, extensibility and dynamic service provisioning.

It is now feasible to invoke basic web services on a smart phone due to the advances in wireless devices and mobile communication technologies. While mobile web service clients are common these days, we have studied the scope of providing web services from smart phones. Although the applications possible with Mobile Host are quite welcoming, the scalability of such a Mobile Host is observed to be considerably low. In the scalability analysis of our Mobile Host, we have observed that binary compression of SOAP messages being exchanged over cellular network have greatly improved the performance of the Mobile Host. While binary compression is observed to be very efficient, the mechanism has raised the need for an intermediary in the mobile web service invocation cycle. The paper addresses our mobile web service message optimization scenario, at the enterprise service bus technology based mediation framework, with evaluation results.

WiMAX (Worldwide Interoperability for Microwave Access) is a technology for wireless broadband and the core technique for the fourth-generation (4G) wireless mobile communications. However it still facing real challenge for low complexity and efficient system implementation. It supports non-line-of-sight environment with high data rate transmission and high mobility up to 125 Km/hr. WiMAX adopted OFDM/OFDMA in physical layer for fixed/mobile applications respectively. Integrated WiMAX model including Channel estimation and equalization are an active area for many recent researches. This paper presents a model for simulating OFDM WiMAX system in Simulink including channel estimation and equalization subsystems in MATLAB functions. Performance has been tested applying Additive White Gaussian Noise (AWGN) channel for fixed system and Doppler shifts due to changes in high and low relative velocity has been calculated and applied to the Simulink channel model for mobile system. Different iterative approaches for channel estimation and equalization have been modeled and evaluated. BER versus SNR curves at high and low Doppler shifts have been used for comparing these models.

Data gathering is a common but critical operation in many applications of wireless sensor networks. Innovative techniques that improve energy efficiency to prolong the network lifetime are highly required. Clustering is an effective topology control approach in wireless sensor networks, which can increase scalability and lifetime. Collaboration of hundreds or thousands of cheap micro sensor nodes allows users to accurately monitor a remote environment by intelligently combining the data from the individual nodes. These networks require robust wireless communication protocols that are energy efficient and provide low latency. In this paper, we develop and analyze an efficient cooperative transmission protocol with robust clustering (RCCT) for sensor networks that considers a fault-tolerant and energyefficient distributed clustering with minimum overhead. RCCT distributes energy load by energy-aware member selection for cooperative data transmission. Simulation results show a better performance of RCCT as compared to the conventional protocols.

In this paper, we propose a novel and efficient mobility extension based on a pro-active approach (i.e., the context transfer/caching occurs prior to the subscriber movement) with the objective to extend existing pub/sub systems to the mobile environments. We also describe the notion of neighbor graph, which forms the basis for pre-loading the subscriber context one hop ahead of its current location. We have investigated the adequacy of our proposed pro-active approach in supporting mobile subscribers and compared its behavior with a durable subscription-based approach adapted by JMS-based pub/sub systems. The experimental results show that our pro-active approach reduces the message loss by more than 50% and the message duplication to zero compared to the durable subscription-based approach. It also achieves better throughput results with low cost in terms of mobility extension overhead