An Effective Solution to Reduce Web Traffic In Wireless Network Architecture By Using Proxy Servers

The Higher-Level and Lower-Level Proxy servers is an effective solution to reduce Web traffic and integrated wireless network architecture using Proxy servers to support mobility management. The technique takes advantage of the existing functionalities of proxy servers to provide mobility support for applications such as Web browsing, HTTP and FTP, without modifying the IP protocol stack of the mobile host. The architecture uses proxy servers to force all packets originating from mobile hosts to a close-by mobility-aware router so that the latter can maintain active data connections during handoffs across different networks. By deploying multiple proxy and mobility-aware router pairs and by assigning mobile hosts to proxy servers dynamically, the proposed architecture provides efficient mobility management functionalities, and is inherently scalable. This paper describes performance and building simulation models for evaluating mobility of proxy servers. The basic idea of the proposed method is the system takes advantage of the existing proxy supports in network applications to maintain network connection during a handoff and to reduce Web traffic than existing scheme. Keywords—Destination server, HigherLevel proxy Server, Lower-Level Proxy server, Mobile Aware Router, Mobile Host. I. INTEGRATED WIRELESS NETWORK ARCHITECTURE THE wireless service providers will start to provide new, enhanced wireless data services using the 3rd generation (3G) wireless technologies such as the EDGE (Enhanced Data Rates for GSM Evolution) and W-CDMA (Wideband Code Division Multiple Access) networks. However, it is clear that customers will expect services with data rate higher than that to be provided by the 3G networks. To meet the growing demand for better data services, many companies have started to provide high-speed data services using wireless local-area networks (WLAN) in places such as airports, convention centers, hotels, etc. Such an approach is particularly feasible and attractive due to the maturity of WLAN technologies such as the IEEE 802.11b, which can provide a data rate of 11 Mbps, for example, far exceeding the maximum data rate of about 480 Kbps to be offered by the EDGE system. We note that one major shortcoming of the WLAN services is its limited service coverage. That is, due to lack of national wireless infrastructure, the WLAN service providers can offer services only in limited areas such as airport and convention center. As a result, users traveling outside of the WLAN areas cannot obtain any services at all. On the other hand, many cellular network operators have a nation-wide footprint, although the data rate will not be comparable with that of the WLAN. For the reason, an integrated MAR and WLAN network for enhanced, seamless wireless data services that take advantage of the wide coverage of the cellular networks and provide high data rate through WLAN whenever it is possible is an ideal solution. A schematic represent of the integrated (or overlaid) WLAN architecture is presented in detail. The network (e.g., the CDPD, EDGE or W-CDMA network) continues to be used to provide services for vehicles and pedestrians with moderate data-rate services in wide areas and roads. In addition, the architecture overlays WLAN’s at places such as airport, convention center, and stadium, on top of the WLAN. The idea is that users located inside the service area of WLAN are expected to be less mobile and equipped with sufficient computation and radio capability (e.g., laptop computer with WLAN airinterface card) for high data-rate services. Thus, these users are served by the WLAN instead of the network for enhanced services when possible. The rest of this paper is as follows. In the next section, we further elaborate the advantages of using such integrated wireless architecture. We also relate our work to previous research in the same general area. Section 3 describes in detail the architecture design, components of the system, as well as it basic operations. In section 4, we extend the architecture for wide area cases where multiple proxies are desired. We conclude in Section 5. II. ADVANTAGES AND MOTIVATION FOR INTEGRATED WIRELESS NETWORK ARCHITECTURE It is well known that mobile users expect high-speed wireless data services to meet their needs for mobile communications and computing. In particular, there is an important market segment of wireless data services for business users (e.g., Venkadesh.R, Dr.K. Rajan / International Journal of Engineering Research and Applications (IJERA) ISSN: 2248-9622 www.ijera.com Vol. 2, Issue 5, SeptemberOctober 2012, pp.057-062 58 | P a g e traveling warriors with laptop computers) who demand for mobile computing services at public places such as airport and convention center. Due to radio propagation difficulty, such indoor areas may not be served well by future networks. In contrast, the indoor environment can be served much more cost effectively in terms of coverage and data rate by WLAN. In addition, a single network may not be adequate to handle traffic for a potentially large number of users in a concentrated area such as an airport. WLAN can be deployed easily to provide enough capacity to meet customers’ traffic demand in the indoor areas. One important advantage of the integrated WLAN network is that the WLAN technologies have become mature and the 3G network will be available very soon. Another crucial advantage is that although the WLAN service providers can offer services at selected areas, only carriers with a national footprint can provide seamless wireless data services to users using the integrated network anywhere throughout the nation. Customers will be served well with much improved data rate by the WLAN at locations where they are less mobile, have time to perform serious mobile computing (e.g., read emails or log onto computers at office) and expect premium services. While customers are located outside of WLAN areas, they can still access services through the network with moderate data rate. The idea of supporting users across different types of networks has been tossed around for some time [2]. Several experimental systems have been tested including research projects at Stanford University and CMU [4][5].The momentum of WLAN and the expected popularity of 3Gb wide area cellular data systems significantly increase the chance of wide deployment of such an architecture. Clearly, at the core of such systems is the mobility management scheme that can maintain users connections after a vertical handoff, a handoff between different types of networks. Mobile IP is the most widely studied approach for handling mobility, where packets from and to the mobile host are tunneled through a home agent at its home network so that the server that is corresponding with the mobile hose can be shielded from the mobility of the mobile host [1]. To resolve certain scalability problem associated with mobile IP, several new schemes have been studied, most noticeably the Cellular IP from Columbia University and the Hawaii project from Bell Labs [3][6]. All of these solutions, including Mobile IP, require significant changes on the mobile host and system architecture[7]. In this paper, we propose a scheme that minimizes these changes, and yet is able to provide mobility management to a wide range of applications very quickly. III. INTEGRATED NETWORK ARCHITECTURE USING PROXY SERVERS In the integrated network environment, mobile terminals are allowed to move between the network and the WLAN. Since both types of networks use their own IP addresses for routing, there is a need for a scheme that can maintain the data flow (connection) between the server and the mobile terminals, regardless of the actual serving network. Traditional mobility management schemes, such as Mobile IP, reside at the IP layer of the protocol stack, thus requiring significant changes on the mobile side, which has hindered the wide deployment of such mechanisms. In this paper, we focus on web-based applications in the integrated MAR/WLAN networks. That is, users make use of the http (Hyper-text transfer protocol) to access required data. Examples of such applications include access to web page and web-based email. Architecture of the integrated network is presented in detail, where mobile terminals access data from a remote server via the wireless access network in use (i.e., network or WLAN) and possibly through the public Internet. An approach to supporting continuous data connection for mobile users is through the use of a proxy server. The proxy is connected directly to a mobility-aware router (MAR), which is a router with mobile management and related functionalities and the MAR is then connected t o various wireless access networks. One can view the proxy and the mobility-aware router as a single, combined entity, although the two can be physically separate pieces of equipment. The essence here is that all the traffic going to and coming from proxy server must pass through the MAR. For instance, the MAR can be the gateway of the subnet where the proxy server is located. The proxy handles functions that traditionally reside in a proxy server, such as transcoding, caching, etc., and it can be completely unaware of the mobility of the client; whereas the MAR handles routing functions and mobility management, and provides a “static” location of the mobile client to the proxy application layer. 3.1 System Components The system has five key components: mobile host (as referred to as client), Higher-level proxy server, Lower-level proxy server, MAR, and destination data server. Their roles in the system are as follows and as shown in the Fig. 1. Venkadesh.R, Dr.K. Rajan / International Journal of Engineering Research and Applications (IJERA) ISSN: 2248-9622 www.ijera.com Vol. 2, Issue 5, SeptemberOctober 2012, pp.057-062