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Unified IP Multimedia Mediator Platform to Provide Triple Play Services Via Virtual Wireless Network

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Unified IP Multimedia Mediator Platform to Provide Triple Play Services Via Virtual Wireless Network Journal of Communications Vol. 14, No. 2, February 2019 Unified IP Multimedia Mediator Platform to Provide Triple Play Services via Virtual Wireless Network Kareem A. Mostafa1, Reem H. Abdel-Hadi2, Hesham M. El-Badawy2, and Salwa H. El-Ramly3 1 Egyptian Chinese University, Cairo, Egypt 2 National Telecommunication Institute, Cairo, Egypt 3 Ain Shams University, Cairo, Egypt Email: [email protected]; [email protected]; [email protected]; [email protected] Abstract—Provisioning multimedia services via packet 3GPP systems for the WLAN selection parameters up to switched network is one of the most innovative trends in carrier aggregation with the WLAN [2]. telecommunication world. IP Multimedia Subsystem (IMS) was This paper sheds further light on the sequence of a masterwork system that it can provide all services over an IP- thought in the IMS system's development, arriving to based infrastructure. This paper aims to illustrate a new model provide a new blueprint in light of the combination of the called IP Multimedia Mediator System (IMM) which is a best ideas and proposals based on virtualized networking unified communication system able to provide all communication and multimedia services. IMM uses the idea of concepts and get out of it a new vision already able to virtualized cloud infrastructure to enhance the interoperability build a unified communications system called IMM. The between different established systems as well as reduce the blueprint constitutes of: delineating the steps to deploy an overall core network complexity. IMM testbed is assessed as applicable IMM test-bed in real-world. a central system for broadcasting multimedia services via The rest of this paper is organized as follows. Section several scenarios. II illustrates the previous work. Then the IMM proposal Index Terms—IMS, 3GPP, WLAN, Virtualization, IMM is highlighted in section III. In this section the main differences between IMM and IMS are delineated. Also, I. INTRODUCTION The IMM test-bed architecture is clarified for both hardware as well as software environment. Next to IMM The concurrent researches are concentrating upon scenarios that are explained in the end of this section. The evaluation of the 4G and beyond as well as mobile edge performance metrics are presented in section IV. Finally, computing systems. Thus, there is a need to improve the conclusion is made in section V. operation of such core network. IMS is a generic framework platform for conveying IP multimedia II. RELATED WORK services to end users [1]. 3rd Generation Partnership Project (3GPP), started Providing the multimedia services in packet switched from release 6 up to release 14 and beyond to concern networks is one of the most active research fields. with developing the interworking architecture to permit Unfortunately, despite of a quite advanced state of 3GPP service providers to offload data traffic from wide research in the field, few IMS based services have been area wireless spectrum to the wireless local area networks defined and developed. This is partly because the testing (WLANs) in indoor locations, hotspots, and other regions and production of IMS-based platforms for developing with high user density [2]. In IMS network architecture and validating services appear to be quite difficult and that is shown in Figure 1, IMS services deployed in expensive [3], [4]. The main three challenges of current 3G/4G domains are accessible only for 3G/4G- IMS infrastructure are low utilization, poor scalability customers’ via WLAN, while other WLAN-customers, and excessive cost [4], [5]. who are not subscribed in the domain, will not be served. Beside the great efforts of 3GPP to resolve these In spite of IMS is a complex architecture and not challenges, the initial work in 3GPP-WLAN interworking scalable enough, modern networks that are not based on architecture specified flexible integration (at the core IMS core would be fraught with inefficiencies and would network) and continuously presented potential be suffering from performance degradation. For these improvements for tighter integration (at the radio access reasons, it is vital to reduce complexity and cost of IMS. network) in light of market trends and demands. WLAN On other side, 3GPP is still searching the direction, is a complementary preference available to mobile which to consider, such as operability with WLAN, operators when they consider expanding the user data ranging between the reasonable enhancements in the traffic capacity further from the unlicensed spectrum. Indeed, WLAN presents complementary characteristics with 3GPP networks which motivate their interworking. Manuscript received July 20, 2018; revised January 17, 2019. With the increased mobile data usage and the desire of doi:10.12720/jcm.14.2.135-141 telecom companies to maximize their return investment, ©2019 Journal of Communications 135 Journal of Communications Vol. 14, No. 2, February 2019 it has become mandatory that WLAN be more integrated approaches for cloudifying the IMS does not meet the with the 3GPP radio access technologies [2]. requirements, and does not show how scalability and One of the proposed solutions to achieve the level of elasticity could be achieved. Also, it was shown that it scalability and elasticity required for IMS is to cloudify will be difficult to remove IMS’ roadblocks without using this Network. Cloudifying IMS can help in wide scale cloudification operations. deployment by using cloud computing concepts and Fig. 1. shows that the IMS architecture consists of principles of reengineering IMS [4]. many blocks such as Proxy Call Session Control Function Using cloud computing technology to reduce the (P-CSCF) that is considered as the first contact point to operational cost is a widespread concern in the industry. User Equipment (UE), also responsible for ensuring that Also, combination of mobile networks and cloud Session Initiation Protocol (SIP) registration is passed to computing could be advantage for network operators, the correct home network and that SIP session messages cloud providers, as well as mobile users. are passed to the correct Serving CSCF (S-CSCF) once Virtualization is the main implementing technology for registration has occurred. The Interrogating CSCF (I- cloud computing, which is one of the most innovative CSCF) is considered an entry point for incoming calls, trends of information technology, by providing the agility also responsible for determining the S-CSCF with which demanded for speeding up resources operations that led a user should register. This is achieved by contacting the to reduce run time and response time, also reduce server Home Subscriber Server (HSS), which checks that the power costs by excessive infrastructure utilization. user can register. The Application Servers (AS) are Virtualization intends to create a virtual version of a entities that host and execute services, such as messaging resource, that is usually physically provided, to minimize and multimedia telephony. Once CSCF gets a request, it hardware costs, minimize risk when deploying physical analyzes the destination address and decides where to infrastructure, and accelerate pace of innovation [4]. route the request based on Domain Name Server / In general, Network infrastructure equipment has Telephone E.164 Number Mapping (DNS/ENUM) included both the control plane and the data plane in the lookup data [8]. Media Resource Function Controller same device. Lately there has been a trend to decouple (MRFC) responsible for pooling of all media servers. the two planes [6]. Breakout Gateway Control Function (BGCF) selects Also, the developers have concluded that there are network (MGCF or other BGCF) in which network different approaches of the network programming: breakout is to occur. Media Gateway Control Function Network Virtualization (NV), Network Functions (MGCF) controls media channels and performs the Virtualization (NFV), and Software Defined Networking conversion protocols needs. Media Gateway (MGW) (SDN). All three types of technologies are linked when provides conversion between Real-time Transport considering trends to form and implement a modern, Protocol (RTP) and Time Division Multiplexing (TDM). scalable, secure, and highly accessible data centre IMS has several functional elements, but it has many environment for multiple applications. obstacles to specify how to be combined or implemented. Although all these strenuous efforts, the researchers One of these obstacles is to enhance the load balancing as noticed that NV is still in its infancy and both SDN and well as network reconfiguration due to nodes failure. So, NFV are still on starting progress because there are many the presented work will try to provide a suitable solution inherent research challenges that should be managed [6], to enhance the network operability with its full services [7]. Also, in [4], [5] it was shown that the existing in non-complex environment [9]. Domain Name Server Home Subscriber Server Application Servers Home Network UA/UE SIP DNS AS SIP HSS AS P-CSCF ENUM AS Media Resource UA/UE SIP Function Controller SIP SIP P-CSCF I-CSCF S-CSCF MRFC Media Gateway Control Function SIP SIP SIP ISUP Call Session SIP BGCF MGCF SS7 Control Function SIP PSTN RTP MGW GGSN Visited Proxy Interrogating Serving Breakout Gateway PLMN Network CSCF CSCF CSCF Control Function Fig. 1. IMS network architecture. ©2019 Journal of Communications 136 Journal of Communications Vol. 14, No. 2, February 2019 III.
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