In this paper, we describe an OPNET model of a General Packet Radio Service (GPRS) network. The model captures the signaling and transmission behavior of the GPRS network. We first introduce a GPRS network and describe the signaling and transmission procedures that will be modeled. In order to point out the simplifications made in the OPNET model, we then address the differences between the GPR...

In this paper, we present some results on GPRS physicallayer performance based on a GPRS simulator. The simulator strictly abides by the GSM standards implementing the detailed transmission chain. We analyze the results of a comprehensive simulation of the GPRS traffic channels. We evaluate the GPRS performance under various environment and service rates. The reference channel model used for th...

Hardware trojans(HT) is one of the main threats for hardware security, especially attacks on General-Purpose Registers(GPRs) processors. This paper presented a novel method to detect HT induced by comparing states GPRs with an embedded reference model in real time. Firstly, instruction sequence was realigned four principles. Secondly, based stream, built. Finally, can be detected expected GPRs’...

This paper describes OPNET implementation of the Mobile Application Part (MAP) protocol within the General Packet Radio Service (GPRS) model. MAP represents an application layer protocol residing on top of the Signaling System 7 (SS7) protocol stack. In GPRS networks, MAP protocol supports signaling exchanges with Home Location Register (HLR) and Equipment Identity Register (EIR). We begin with...

GPRS support nodes The GPRS support nodes constitute the parts of the Ericsson cellular system core network that switch packet data. The two main nodes are the serving GPRS support node (SGSN) and the gateway GPRS support node (GGSN). Figure 1 shows an example of the architecture of Ericsson’s GPRS solution in a GSM cellular network. GSNs are also used for GPRS domains within a UMTS or TDMA sys...

* The project is financially supported by Nokia Research Center, Sonera, Technology Development Center of Finland and Helsinki Telephone Company. AbstractGPRS is designed for transmitting packet data and supposed to take its radio resource from the pool of channels unused by GSM voice services. The number of channels allocated to GPRS is a random variable depending on the voice traffic. In thi...

BACKGROUND Research suggests that older patients may be reluctant to engage general practice registrars (GPRs) in their care. The authors undertook a qualitative study of the attitudes of older patients to GPRs to investigate this issue. METHOD Thirty-eight patients aged 60 years and over from three training practices participated in semistructured telephone interviews, which explored patient...

BACKGROUND Mobile health (mHealth) technologies hold incredible promise to improve healthcare delivery in resource-limited settings. Network reliability across large catchment areas can be a major challenge. We performed an analysis of network failure frequency as part of a study of real-time adherence monitoring in rural Uganda. We hypothesized that the addition of short messaging service (SMS...

This study presents the performance analysis of a new tight coupling based WLAN/GPRS interworking architecture. The effects of network traffic on downward handoff latency are investigated. The results indicate that increasing WLAN traffic increases the overall downward handoff latency more than increasing GPRS traffic. On the other hand, increasing GPRS traffic results in higher packet bufferin...

-In this paper the performance of radio resource allocation in GSM/GPRS network is analyzed. A two dimension Markov chain is presented using guard channels for handover calls. Also priority is given on reservation of QoS of voice service by applying priority for voice calls to pre-empt GPRS data packets. Key-Words: GSM, GPRS, Networks.