CONSISTENT AND SECURE MULTIMEDIA DATA TRANSFER OVER WLAN FUSED NETWORK

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1 International Journal of Computer Networking, Wireless and Mobile Communications (IJCNWMC) ISSN Vol. 3, Issue 2, Jun 2013, TJPRC Pvt. Ltd. CONSISTENT AND SECURE MULTIMEDIA DATA TRANSFER OVER WLAN FUSED NETWORK AKANKSHA GUPTA & ABHISHEK JAIN Assistant Professor, Department of Information Technology, ITGGV, Bilaspur, Chhattisgarh, India ABSTRACT WLAN can properly address the traffic requirement in hotzone, with the help of service provider of 3G wireless data network. But an important issue related to combining the wireless LAN with wireless data network leads to fusionmobile data network. Such fusion-network allow users to experience seamless and secure and ubiquitous data services and very high data rates. In this paper we deal with the issues of combining the two network by using special node called proxy node to offer seamless connectivity. These proxy node will provide continuos and secure fusion of mobile network operators with wireless local area networks. KEYWORDS: WLAN, 3G, Fuzion Mobile Data Networks, UMTS INTRODUCTION To offer traditional voice communication and packet data services for video application with effective cost and enhanced performance the 3G wireless data network is designed. In this paper the UMTS( Universal Mobile Telecommunications Systems) is used which is one of the standard standardized systems for 3G wireless data networks. For multimedia users it is found in behavior that download bandwidth is approximatly 3-times higher than upload bandwidth. Furthermore, in 3G wireless data network, Hotzone are those geographical areas where mobile stations require usage are of high-speed data services. Temporary and permanent hotzone areas are created in heavily populated places such as airports, coffee shops, hotels, exhibitions, and convention centers. Microcell, picocell, and repeater solutions have been proposed, and the performance of such solutions has been evaluated [5][6][7]. However, such solutions are expensive, from cost perspective and/or installations perspective. Service providers of 3G wireless data networks can deal with the issue of traffic requirements in hotzones with the help of WLAN. The IEEE defines the standard for WLANs. Based on the standard, the WLAN operates in either ad-hoc mode or infrastructure mode. The infrastructure mode is relevant to the integration with wireless networks. In infrastructure mode, an Access Point (AP) coordinates the transmission among nodes within its radio coverage area, called service set. A Mobile Node (MN) can only associate with one AP at a time. All the MNs associated with an AP communicate with each other either through the AP or directly coordinated by the AP. A number of APs can be interconnected through an IP routed network to form the WLAN IP network, as shown in Figure 1. An access router (AR) in the figure connects one or more APs to the network. The APs provide radio interface to the WLAN network, and exchange IP packets with the access routers.

2 120 Akanksha Gupta & Abhishek Jain The MN is connected with a single AR at any given point in time, which is called the serving AR. The WLAN network is capable of routing IP packets to the serving AR while the MNs move through some form of mobile routing. Figure 1: IEEE WLAN A benefit of combining WLAN with 3G wireless data network in hotzones is to allow subscribers to experience seamless and ubiquitous data services and very high data rates. Combining WLAN with 3G wirelass data network requires technical compatibilities like vertical handover between these two technology and other issue like common billing system, authentication and accounting. The purpose of this paper is to examine the issues due to combining WLAN with 3G wireless data network and try to minimise these problem using proxy node at each intermediate server. RELATED WORK The is there are so many standard for 3G mobile systems among which are Universal Mobile Telecommunications Systems (UMTS). The UMTS-based network architecture [9] is shown in Figure 2. two basic components of model are: The UMTS core network (UCN), and the UMTS terrestrial radio access network (UTRAN). The UCN is the circuitswitched network responsible for providing voice and circuit-switched services, in addition to the packet-switched network responsible for providing packet-based services. Functionally, the circuit switched domain consists of the mobile switching centre (MSC) responsible for routing voice calls and the gateway MSC (GMSC) for interfacing with other public switched telephony or ISDN networks. In contrast, the packet-switched domain is comprised of the serving GPRS support node (SGSN), the gateway GPRS support node (GGSN), and other functional entities responsible for routing, maintaining, and billing specifics of the data services such as Domain Name Servers (DNS) and Dynamic-Host Configuration Protocol (DHCP) servers and firewall platforms. The later functionalities are essential part of the 3G network to provide connectivity to the Internet and support packet-based data services over the wireless mobile network. Finally, the UTRAN component provides the wireless access to the services provided by the UMTS network and consists of a collection of radio network controllers (RNC), and base stations, referred to as Node B. Node B is the network entity providing the immediate wireless access for mobile subscribers, while the RNC assumes the management and control tasks within the UTRAN segment as well as the interface with the rest of the UMTS network.

3 Consistent and Secure Multimedia Data Transfer over WLAN Fused Network 121 Figure 2: Simplified UMTS Network Architecture Main component of packet-switched core network for UMTS is 3G-SGSN plays a key role in providing data services. The 3 G-SGSN entities provides the necessary control functions for the user equipment (UE) as well as for the gateway 3G-GGSN. Furthermore, it performs the required signaling and data interface for IP-data calls routed through the 3G-GGSN and the required signaling (Signaling System 7 or SS7 protocol) with entities such as home location registry (HLR), equipment identification register (EIR), and authentication center (AUC). The later signaling is essential for tracking the location of mobile data terminals and performing other key functions such as security, access control, and billing. Therefore, the 3G-SGSN entity plays a fundamental role in the integration process between UMTS and wireless LAN networks.3g SGSN can also work as proxy node for both side of network to resend the required information. Figure 3: Tight Coupling Solution The UMTS network defines multiple radio access technologies. The UTRAN interface mentioned earlier is one of these technologies. Another interface is the GSM EDGE radio access network (GERAN). In the same manner, a third interface supporting WLANs can be defined. The Lu interface, currently being used between the 3G-SGSN and the RNC can be modified and standardized to provide the connectivity between the UMTS core network (3G SGSN) and the WLAN through its radio controller, the Inter Working Unit (IWU). IWU can also work as proxy nodes for others nodes to minimize the packet traveling time in network. This is tightly coupling strategy shown in Figure 3. Tight coupling solution provides seamless handoffs between the two networks and allows the wireless LAN component to exploit all the predefined mobility, security and QoS functions defined at the UMTS core network. However, this requires the standardization of the new interface and the adaptation of data terminals (such as laptops and handheld devices) to use an embedded subscriber identity module (SIM) card in a manner similar to existing mobile phones.

4 122 Akanksha Gupta & Abhishek Jain PROPOSED ARCHITECTURES An alternative solution to tight coupling is what is known as the loose coupling solution which requires less standardization effort compared to the former solution. According to this strategy the WLANs requires connectivity to the HLR entity in the UMTS core network through its Authentication, Authorization and Accounting (AAA) entity. The HLR stores the current subscribers locations and maintains the list of services allowed for each of these subscribers this can also work as proxy nodes to resend the information. Figure 4 shows a simplified loose coupling scenario. The customer care and billing services (CC&BS) with loose coupling, as it is with tight coupling, is still centralized and transparent to WLANs mobiles. However, unlike tight coupling, this alternative does not require specific network access equipment. Finally, the last category of solutions is referred to as the open coupling alternative where no standardization is required and the linkage between the WLAN and the UMTS network is performed only at the customer care and billing system. This solution is depicted in Figure 5. In this solution, the AAA server sends information related to the subscriber usage of the WLAN to the mobile network CC&BS and also it can retransmit the information if required by the customer. It is apparent that the WLAN in this situation is not employing the UMTS security or QoS mechanisms. However, this solution requires the least dedicated infrastructure and can utilize standard commercial products. Therefore, in terms of deployment and network setup, this solution surpasses the other two strategies. Figure 4: Loose Coupling Solution Figure 5: Open Coupling Solution The above three coupling scenarios represent the three main generic categories for a wide range of integration solutions. For example, reference [14] presents an integration solution based on loose coupling where a specific network

5 Consistent and Secure Multimedia Data Transfer over WLAN Fused Network 123 entity called therein Integration of Two Access Technologies (IOTA) is introduced to perform the mobility, authentication, and accounting functions required for the integration process. The author in reference proposes a tight coupling-based architecture that supports simultaneous (voice and data) services where the packet-switched data connection is carried over the WLAN part of the network, while the circuit-switch voice call is served using the UMTS infrastructure. The new model allows inter-system handover for subscribers without jeopardizing existing connections. As a third example, references [6][7] propose two open coupling architectures capable of providing interworking between 3G and WLANs. The first architecture enables 3G subscribers to roam into a wireless LAN and still receive service, while the second one allows extends the first model to allow 3G packet switched services for WLAN users. The later model will allow 3G users to benefit from the high-speed service rates offered by WLANs in strategic hotzones (e.g. airports, hotels, etc.) and maintain access to the same packet switched service supported by the mobile network. FUTURE ENHANCEMENT While generic solutions exist as has been demonstrated in the previous section, these however provide only the general guideline for integration process. There remain a number of unanswered questions and issues related to the integration process that can be considered as future enhancement. These include the availability of bandwidth and the licensing public data network operation, the billing and accounting infrastructure, and the roaming functionality. In addition, other issues like network security and management, and the availability and support of applications should be addressed before a full integration solution is specified. CONCLUSIONS This paper Numerate architectures/solutions relevant to existing or future Telecom Company mobile network infrastructure also Propose UMTS compliant network infrastructure that is both backward compatible with existing infrastructure and incorporates WLANs data services. Last but not least it Provide a typical deployment scenario in support of required functionality by specifying required network elements and possibly the corresponding commercial available product. REFERENCES 1. Ilari Welling, JarmoHarno, François Loizillon, KjellStordahl, DimitrisVaroutas, Techno-Economic Evaluation of 3G & WLAN Business Case Feasibility Under Varying Conditions, 10th International Conference on Telecommunications (ICT), 2003, Vol. 1, pp Embedded-Wi-Fi Market Undergoes shift, 3. EeroWallenius, TimoHämäläinen, TimoNihtilä, JyrkiJoutsensalo, Kari Luostarinen, 3G Interworking With WLAN QoS e, IEEE 58th Vehicular Technology Conference (VTC), Fall 2003, Vol. 3,pp Wei Zhuang, Yung-SzeGan,Kok-JengLoh,Kee-Chaing Chua, Policy-Based QoS-Management Architecture in an Integrated UMTS and WLAN Environment, IEEE Communications Magazine, Vol. 41, Nov. 2003, pp S. A. Ghorashi, L. Wang, F. Said, A. H. Aghvami, Non-Real Time Packet Transmission For A Microcell (Hotspot) Embedded In CDMA Macrocell Systems, IEEE International Conference on Communications, ICC '03, Vol. 2, pp

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