The General Packet Radio Service extends the existing GSM mobile communications technology by providing packet switching and higher data rates in order to efficiently access IP-based services in the Internet. Even though Quality-of-Service notions and parameters are included in the GPRS specification, no realization path for Quality-of-Service support has been proposed. In this paper we adapt t...

In this paper, we propose and present a new access persistence control mechanism for packet cellular networks, such as General Packet Radio Service (GPRS) system, in order to improve the MAC layer performance. The MAC layer in GPRS make use of slotted ALOHA protocol combined with a specific retransmission mechanism to establish the physical connection. The main object of the new mechanism is to...

The traditional method of controlling street lamp lighting could not adjust the brightness of bulbs, while the management and maintenance had to rely on labour patrol. The combined ZigBee and GPRS technology with LED lights is an advanced controlling method for street lighting, particularly resolves the issues in monitoring and energy consumption. This paper presents a general system that incor...

Mobile telephone systems are undergoing a substantial change from voice based systems which also support data transfer to become systems which truly support packet switched data services to mobile subscribers. This evolution towards the third generation (3G) mobile system will be based on the Global System for Mobile communications (GSM) [1] and will begin with the General Packet Radio Service ...

This article describes a next-generation architecture for wireless communications, based on mobile phone carriers (GPRS) and broadband (WiFi), developed for the field of railways and allowing "train-to-earth" communications. This communication channel aims to complement traditional railway communication systems and its benefits make the deployment of new services, such as passenger oriented ser...

This paper presents an empirical task-based user evaluation, which was carried out for the purpose of assessing the subjective QoS of a mobile multimedia web service in a real multi-access network environment comprising of WLAN and GPRS networks and automatic mobility management with Mobile IP. Subjective quality ratings were collected from 20 test users to obtain a distribution representing th...

GPRS/EDGE networks are designed to transmit packet data. Several types of traffic with varying characteristics have to be supported by these networks. This paper proposes an analytical performance model for GPRS/EDGE networks in order to derive a simple relationship between cell capacity, traffic characteristics and performance. The model presented is based on the Modified Engset Model assuming...