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.

The average downlink bandwidth of GPRS is about 25Kbps, while the bit-rate of typical streaming media is at least 100Kbps. It is an exigent job for GPRS business system to decrease bit-rate of streaming media. In this paper we propose a novel scheme, which can select decoding parameters (based on the special attribute of different kinds of streaming media program) automatically to fit the bandw...

Mobile telecommunication systems such as General Packet Radio Service (GPRS) and Universal Mobile Telecommunications System (UMTS) provide packetswitched service for mobile terminals. 3GPP Release 4 and Release 5 further offer packet voice over a GPRS/UMTS infrastructure so that IP based communications between mobile to mobile is expected to be one of the major traffic types in the future 3G Al...

A traffic model for GSM/GPRS, the hybrid radio resource allocation (HRRA) algorithm is evaluated. A dedicated number of GPRS channels plus idle periods between voice calls are used for GPRS data packet transfers. A simulator was developed in order to evaluate the HRRA algorithm, which provides a reasonable forecast on the voice blocking probability and on packet delay for a single cell system. ...

GPRS is the new packet-oriented data service for GSM. Soon it will be possible to take advantage of the features provided by GPRS for Internet Access like fast connection set-up, volumebased charging and staying on-line for long periods. For non-realtime Internet applications TCP is the applied transport protocol. Often it was suspected that GPRS introduces severe performance degradations for T...