Distributed Client/Server Architecture With Dynamic Middle Tier

Widespread use of computer networks and the demanding needs of current network applications and technology impose a challenge to use the bandwidths in an efficient manner so as to solve the network congestion and server overloading problems. Some past and on-going solutions such as server replications and caching have been proposed to overcome these deficiencies. However, these solutions have not been implemented in an economical and configuration-transparent manner. Moreover, the problems of caching and disseminating real-time multimedia data in a bandwidth-conservative manner have not been addressed. In this thesis, a CHEK Proxy Framework (CPF) has been developed using a proxy solution to address these problems. By caching, proxy has become a traditional solution in reducing user-perceived latency and network resource requirements in the network. CPF helps to create a middle-tier application platform proxy transparently and dynamically in the client sub-network to execute the sharable section of any server application codes. This is as the application proxy. Besides caching static web contents, this local application proxy helps to deliver real-time multimedia data on behalf of the remote server with lower bandwidth and better performance. CPF helps to minimize WAN connections while maximizing LAN interactions by multiplexing and de-multiplexing client requests through to the server via the proxy. As a result, the central server is made more reliable and scalable. The monitoring and management of the CHEK distributed objects is also made easier through the use of the CHEK Management Console (CMC). CMC displays the inter-relationships between the distributed objects and their status information on a GUI-based control panel for ease of management. With its dynamic and transparent features, software verslOrung and maintenance problems are readily overcome. CPF has been shown to be useful in most client/server applications, particularly those of broadcasting and collaborative nature such as video broadcastings and chat systems. CPF solves the network congestion and server overloading problems with the presence of a middle-tier proxy application platform which is allocated in the client sub-network with no manual configurations

Policy-Based Dynamic Proxy Framework: An Application Level Infrastructure For Active Service Creation And Contents Delivery

This thesis focuses on the dynamic proxy framework named the Chek Proxy Framework (CPF). The main objectives are to scale the existing Internet architecture by conserving the backbone bandwidth, reducing server loads, and improving the overall networking system performance, particularly the client receiving rate. These were achieved by deploying application-level proxy services within the network, to accelerate and customise the delivery of contents. The CPF is based on the 3-tier distributed computing architecture with the client and server residing at the ends of the respective networks. A dynamically appointed middle-tier system, the Dynamic Application Proxy Server (DAPS) is created ondemand and resides at the client-side network based on the designed clustering policy. The uniqueness of CPF lies on the use of voluntary client machines, instead of static and dedicated machines to host DAPS services created at runtime

Seamless SIP multimedia session transfer on IPv6 network via device switching

Due to significant popularity of Location-based Services and Multimedia communication over mobile devices, there are many researches has been conducted to extend the features of location tracking and make it cost-effective to users. It becomes necessary for the users to have seamless communication with automated switching of software applications. This paper focuses on the performance of indoor location tracking system on IPv6 Network Island with multiple real time applications that has location assisted transfer for mobile users. RSSI (Received Signal Strength Indicator) mechanism has been used to locate the moving nodes. The developed location tracking server is having dynamic and centralized MySQL database management system. SIP (Session Initial Protocols) user agent has been used to deploy intercommunicating of multimedia data for instance; video and audio conference, text messaging among the moving nodes and user can transfer the seamlessly transfer the session to their nearest mobile node which will be determined by the Location Server. This paper is going to discuss about the seamless performance of SIP during the session transference. The developed project is cost-effective and precisely conducive for the industries or any indoor organization. The prototype of the project has been successfully developed and has been tested as well. The results show the seamless connectivity of the multimedia application during device switching

Client/server architecture having a dynamic and transparent middle tier

There is disclosed a client / server digital computing network architecture that works in a three-tier environment and having a dynamic middle-tier configuration. In the three-tier architecture of the present invention, a middle tier is added between the user (client) and the central server. The middle-tier is adapted to be dynamic for flexibility to handle a large number of users and to address the issues of bandwidth utilization and network congestion in an efficient, effective and transparent manner. In the present invention, a client workstation is selected to be dynamic proxy where a Dynamic Application Proxy Server (DAPS) within the client workstation is adapted to handle and serve request from subsequent remote clients on behalf of the central server, and provides the only connection to a Server Application in a central server. This invention effectively delegates all client request to the DAPS while freeing the central server to conduct other more specific operation