Views
3 years ago

Simulation Study over IP Based GSM Backbone - Quality of Service ...

Simulation Study over IP Based GSM Backbone - Quality of Service ...

Simulation Study over IP Based GSM Backbone - Quality of Service

Simulation Study over IP Based GSM Backbone András Császár, Attila Takács, Csaba Lukovszki, Róbert Szabó High Speed Networks Laboratory, Department of Telecommunication and Telematics, Budapest University of Technology and Economics, Pázmány Péter Sétány I/D., Budapest H-1117, Hungary. E-mail: csaszar, takacs, lcsaba, szabor@ttt-atm.ttt.bme.hu Abstract— This paper focuses on the questions of the evolution of mobile communication. Improving GSM networks is a key step in the development towards the 3rd generation of mobile communication systems. In the current article implementation possibilities of IP in the GSM (Global System for Mobile communication) backbone are investigated. Our goal is to justify the theory; applying absolute priority scheduler to transmit voice packets over IP (VoIP) assures better service, classifying packets according to their delay expectations. To achieve this goal simulations are applied to examine the effects of class numbers, classification and traffic control algorithms. Besides, we tried per-hop priority re-classification and a special early packet discard method. Keywords— Differentiated Services, Voice over IP, IP based GSM backbone I. INTRODUCTION UROPE has witnessed in recent years a massive growth of mobile subscribers, starting with the more traditional analogue based systems to the current generation of digital systems such as GSM (Global System for Mobile Communication), DCS-1800 (Digital Communication System at 1800MHz), ERMES (European Radio Messaging System), TETRA (Trans European Truncked Radio) and to a less extent DECT (Digital European Cordless Telephone). The GSM family enjoys word-wide success; having already been adopted by 190 operators in more than 80 countries. Nowadays the engineers of mobile telecommunication have to face the wider expectations from users than ever. From the user’s perspective, the new generation will strive to ensure that the current mobile services are extended to include multimedia as well as yet undefined services, where access to services is possible without regard to the underlying networks. The convergence of mobile services to the wired services is inevitable [1]. Unfortunately, the main part of currently developed services can not be assured with 2nd generation (2G) technologies. The necessity of evaluation is powered by the rapid changes of the number of mobile users and the shift of hub between data transmitted through mobile and wired networks. According to the forecast [2] at the top of this decade there will be more than one billion mobile users and most of them will have the possibility to connect to the Internet. Implicitly, one quarter of the total information will be transmitted over mobile devices; mobile phones and terminals. To address the question of generation evaluation, tremendous importance is given in Europe to the development of Third Generation (3G) Mobile Telecommunications Systems. It is expected that mobile and personal communications will become a key driver for growth and innovation in the third millennium as well as being a necessary building block of the Wireless Information Society. The definition of the Third Generation of Mobile Systems, known as UMTS in Europe and FPLMTS/IMT-2000 elsewhere, is one of the most urgent tasks [3] [5] [6]. The vision of UMTS is to support all those services, facilities and applications that customers presently enjoy, and to have the potential to accommodate, yet undefined, broadband multimedia services and applications with quality guarantees. This effort will require unified services in wireless and wired systems. The future mobile technology is targeted to support a very broad mix of communication services and applications, flexible, on-demand bandwidth allocation for a wide variety of applications and standardization that allows full roaming and inter-working capability. If UMTS becomes fully deployed, it will mean a major leap toward the provision of a technically integrated, comprehensive and consistent personal communication system supported by both fixed and mobile terminals. As a result, mobile access networks will begin to offer services that have traditionally been provided by fixed networks, including wideband services up to 2 Mbps [5]. UMTS still requires a revolution in terms of radio airinterface design and continues evolution of intelligent network principles. The arrival of new technologies of 3G mobile systems does not preclude the developments currently open to recent technologies such as 2G mobile systems. The trend in this decade is the parallel process of UMTS design and 2G enhancement. Consequently, there is global need to deploy a packet based carrier to support wide range of requirements and services. The most potential candidate is the IP protocol because of great number of services are already deployed. Experiences show us, this protocol is adequate to merge different services and the mobile and wired services, besides equipments exist to provide the same user services over different access forms [3] [5]. The first challenge is to provide a certain level of quality assurance for voice calls over IP-based backbone architecture. However there exist solutions under approaches of Integrated Services and Differentiated Services, there is huge importance keeping the complexity as low as possible. In this paper we offer a scheduling based solution providing differentiated services for voice calls considering the expectations of mobile users. The expectation is derived to a simple metric called per-hop spare time that is used to make classification of calls, that are served the simple but efficient Static Priority Queuing (SPQ) approach. This paper is organized as follows: the second section introduces relevant pieces of GSM architecture and draw a topology that will be used to investigate our solution for service differentiation that is the main topic of the following section. The applied traffic control approaches, including classification and drop mechanisms are presented in the next chapter. After discussing the theoretical approaches the paper focuses on the model we used. Next, in the rest of the article the numerical results are presented and conclu-

Traffic Simulation over IP, Analog, TDM, and Wireless with MAPS
voice communication over ip-based networks - Quality of Service ...
Voice Traffic Control Study final 1 - Quality of Service Internet ...
A Distributed Simulation Backbone for Executing HLA-based ...
Traffic Shaping and Scheduling for OBS-based IP/WDM Backbones
Voice over IP Quality of Service Using Active Queue Management
Quality of Service for Voice-over-IP Networks - Extreme Networks
A TM Quality of Service and IP-over-A TM - kitchenlab.org
IP B GSM B - Quality of Service Internet Technologies Laboratory
A Simulation Study of TCP over the IEEE 802.15.3 MAC
Quality-of-Service Signaling in Wireless IP-based Mobile Networks
Simulation based Study of TCP Variants in Hybrid ... - ResearchGate
Scalable Coding of Video over IP-based Networks
"Quality of Service Management in IP networks", In - ResearchGate
Quality of Service for IP networks - in Theory and Practice
The IP Multimedia Subsystem (IMS). Quality of service and ... - DIT
Dynamic Grooming in IP over WDM Networks: A Study with Realistic ...
QoS Management wit h Differentiated Services IP over the Internet
Simulating a trust-based service recommender ... - Julita Vassileva
Quality of service in IP over WDM: considering both ... - IEEE Xplore
A Web Services Based Framework for Voice over IP - DSpace at ICSY
Study and analysis of quality of service in different image based ...