The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Header compression is the process of reducing protocol header overhead in order to improve link efficiency while maintaining the end-to-end transparency. Robust header compression (ROHC) is a scheme for IMS (IP multimedia subsystem) and MBMS (multimedia broadcast multicast service). ROHC is defined for 2.5 Gm (GPRS) and according to 3Gpp2 next generation network, in CDMA2000 1x EV-DO and 1x EV-DV...
GPRS, EDGE, 3G and HSDPA are wireless data services that are deployed by Mobile operators to provide higher data rate. This paper provides a set of measurements that are used to evaluate, from user perspective, these types of data services in the State of Kuwait. The Measurements are taken in different areas of Kuwait. Measurements show that HSDPA is the best wireless data connection offered by the...
GPRS or the general packet radio service is a non-voice value added technology that allows data communication over mobile phones in an Internet Protocol (IP)-based network [11]. This paper focuses on the transmission of voice over the existing data channel in GSM/GPRS networks using a Web server. Since the data channel in any network is economically viable for transmission, a mechanism to transfer...
P2P applications are increasingly popular. Unlike traditional client-server applications they do not require central server resources. This makes them less costly to host and maintain. While there have been a large number of P2P applications developed for PC based systems, there are only very few for mobile appliances, such as mobile phones or networked PDAs. Furthermore, there are even fewer applications...
One of the main challenges of using mobile devices as a learning platform is the impermanent network environment due to the wireless coverage or wireless link fail. On the other hand, GPRS or 3G telecommunication protocol offer the persistent connectedness of learning, but comparative weak computing power and very limited network bandwidth cause the learning as time-consuming process. Besides, the...
This paper presents efficient methods of vertical handoffs from UMTS to WLAN and vice versa in a loose coupling architecture. When a mobile terminal (MT) moves from UMTS to WLAN, it performs mobile IP (MIP) registration with home agent (HA). Subsequently, HA needs to perform location update signaling with UMTS network to make the MT reachable from UMTS. If HA is deployed at gateway GPRS support node...
Efficient solutions for Web services on mobile devices would allow truly global, platform independent, and interoperable information access, anywhere and at any time. While Web services are continuously gaining ground, they are commonly reserved for use on personal computers and high-capacity servers. However, mobile devices are gradually becoming more advanced in terms of processing resources and...
As a result of the evolution of computer and networking technologies, the Third Generation Partnership Project (3GPP) has proposed the IP Multimedia Subsystem (IMS) as a key element in Next Generation Networks (NGN) that supports multimedia services in the packet switched domain. To use IMS services, users should register in IMS network and to have their information be registered in IMS Databases...
Systems such as wireless handsets include an integrated System-On-Chip (SoC) often based on a multi-core architecture, with at least one Digital Signal Processor (DSP) and one Micro Controller Unit (MCU) core. Validating the application and modem software that runs on these devices is a lengthy task. Moreover, the earlier software developers can access a realistic platform of the system, the earlier...
Mobile operators nowadays have plenty of data services, since the introduction of GPRS and this number is increasing towards future 3G LTE mobile networks. There are IP-based services which were migrated from wired to mobile networks, such as HTTP, FTP and E-mail. But, also mobile specific services were created such as WAP and MMS. On the other side, behavior of mobile services is influenced from...
This paper presents a 3.2-to-4GHz fractional spur-free ADPLL. The ADPLL is fabricated in a 0.13 mum CMOS process and packaged in QFN76. Fractional spurs are filtered by accurate digital loop-gain calibration and digital phase-noise cancellation. The ADPLL is designed to minimize the switching noise while taking advantage of digital scaling.
In recent years, wireless communication technologies have been pervasive. We have many wireless options to connect to the Internet: IEEE 802.11 WLANs, GPRS, UMTS and many other competing technologies. These wireless standards were designed independently of each other. Hence, these standards do not specify a common solution to perform connection handover between two different standards. Given that...
For the future we foresee each vehicle to feature wireless communication (to the Internet and/or other vehicles) over various technologies, e.g., UMTS/GPRS, and WLAN/WiFi. In this paper we show how access to such communication resources could be granted to individual components (CAN bus connected ECUs) in the car by allowing transparent data transport using the standardized Internet Protocol (IP)...
To meet the growing demand for broadband wireless connectivity, integrating 3G and IEEE 802.16 networks is a clear and viable solution. In this paper, we present a novel mobile client architecture called HDEL (handover decision and execution layer) that provides seamless mobility while maintaining connectivity across heterogeneous wireless networks and provides better quality of service (QoS) support...
Requirements are growing faster than ever. Keeping a product in sync with ever growing requirements is a big challenge and IMS is a classic example for the above statement. 3GPP IMS standards are evolving and the client side requirements bulge every month. It is important to ensure an IMS client is tested during the time of development with a platform that simulates the IMS network. As it is an expensive...
General packet radio service (GPRS) is bearer service of Global System for Mobile (GSM) that has been deployed worldwide and is widely considered a technology precursor to the evolving third generation (3G) wireless network. In order to improve the GPRS traffic performance, the study on the factors contributed to the low performance of GPRS is carried out. This paper applied the data analyzing method...
The evolutionary path taken by cellular standards to the current and future standards is incomplete without fully understanding the older standards. The comprehension of the GSM standard, specifically the procedures for protocols exchange over the air interface will help students understand radio resource allocation procedures in GPRS and UMTS, and will ultimately assist future communication engineers...
Beyond 3G wireless systems will be vested with dynamic reconfiguration capabilities capable of adapting their protocol stacks during runtime to optimize spectrum utilization and, thus, better meet the ever-changing service demands. For protocol stack reconfiguration to become a practical capability, a language for modeling, expressing and circulating data essential to reconfigurable protocol stacks...
A prototype of a system based on a Bluetooth body area network (BAN) for continuous and wireless telemonitoring of patients' biosignals is presented. Smart phones and Java (J2ME) have been selected as platform to build a central node in patients' BAN. A midlet running in the smart phone compiles information about patient's location and health status. The midlet encrypts and retransmits it to the server...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.