In this paper, we describe a General Packet Radio Service (GPRS) OPNET simulation model and the implementation of the Radio Link Control/Medium Access Control (RLC/MAC) and the Base Station Subsystem GPRS protocol (BSSGP). The RLC/MAC and BSSGP protocols are added to an existing GPRS OPNET model. We have enhanced the existing model by implementing unacknowledged mode of RLC and two phase access...

در میان شبکۀ معابر شهری، راه‌های اضطراری امدادرسانی حین زلزله، به‌ویژه مرحلۀ پاسخ به بحران، نقش مهمی ایفا می‌کنند. حفظ عملکرد این شبکه از معابر، ساعات اولیۀ پس اهمیت بسزایی دارد. محافظت و مقاوم‌سازی اجزای آسیب‌پذیر شبکه، به‌خصوص پل‌ها، پیش وقوع تأثیر شایان توجهی کاهش خسارات آسیب‌ها اغلب اوقات تمامی آسیب‌پذیر، به‌دلیل محدودیت بودجه، عملاً ناممکن است. ایجاب می‌کند که با شناسایی دقیق گزینه‌های ابتد...

As a consequence of rapidly increasing mobile communications, efficient utilization of the scarce radio resources becomes one of the most important issues in the system evolution. Increase of the system capacity has been investigated in two ways. The first way is to replace the fixed channel allocation (FCA), with the more efficient dynamic channel allocation (DCA). The second way is to utilize...

The General Packet Radio Service (GPRS) extends the Global System Mobile Communication (GSM) by introducing a packet-switched transmission service. This paper analyzes the GPRS behavior under critical conditions. In particular, we focus on outages, which significantly impact the GPRS dependability. In fact, during outage periods, the cumulative number of users trying to access the service grows...

In this paper we discuss the applicability of GPRS and EGPRS for the transmission of voice packets in an end-toend packet switched scenario. We assume typical Voice over IP (VoIP) applications spanning between a fixed and a mobile terminal. As the transmission delay of the voice packets has most impact on the perceived Quality of Service (QoS), it has been put into focus of our investigations. ...

Mobile telephony has been for many years the most popular application supported by mobile systems such as the Global System for Mobile communications (GSM). Recently, the use of mobile data applications such as the GSM Short Message Service (SMS) has gained popularity. However, the GSM system can only support data services up to 9.6 kbit/s, circuit switched. The General Packet Radio Service (GP...

The main objective of this paper is to describe a new designed software tool to simulate the GPRS network. The proposed simulation technique shows how to connect the components together so as to achieve the correct network for the GPRS technology. While connecting the components, the user will be able to observe how these components interact with each other and how the Mobil ends and receives d...

The topic of this paper is the evaluation of the impact of data traffic composition on GPRS performance. A detailed statistical analysis of GPRS traffic per service at different levels has been carried on live measurements. A multi-service performance model is presented in order to derive simple and closed form formulas, associating capacity, traffic characteristics and performance. This perfor...