The LTE/LTE-A has become a catchphrase for research and lot of research are being conducted and carried out in LTE in various issues by various people. New tools are developed and introduced in the market to interpret the results of the... more
The LTE/LTE-A has become a catchphrase for research and lot of research are being conducted and carried out in LTE in various issues by various people. New tools are developed and introduced in the market to interpret the results of the new algorithms proposed by various people. Some tools are open access which are free to use but some tools are produced by the companies which are not open access. In this paper some of the open access simulation tools like LTE-Sim and NS-3 are analyzed and LTE downlink scheduler algorithms are simulated using those tools. In LTE systems, the downlink scheduler is an important component for radio resource management; hence in the context of LTE simulation, a study between the downlink scheduler models between the simulators are performed.
In this paper, we propose a PIFA based multiband internal antenna that can support seven frequency bands. The antenna is designed to operate at GSM (Global System for Mobile Communications, 880-980 MHz), PCS (Personal Communication... more
In this paper, we propose a PIFA based multiband internal antenna that can support seven frequency bands. The antenna is designed to operate at GSM (Global System for Mobile Communications, 880-980 MHz), PCS (Personal Communication Services, 1880-1990 MHz), UMTS (Universal Mobile Telecommunications System, 1.9-2.17 GHz), WiBro (2300-2390 MHz), Bluetooth (2.4-2.48 GHz), S-DMB (Satellite-Digital Multimedia Broadcasting, 2.630 ~ 2.655 GHz) and WLAN (Wireless Local Area Network, 5.16 ~ 5.5 GHz) frequency bands. Multiple frequency bands have been realized by using slots and quarter-wave length resonating strips. A matching stub and multiple short circuiting strips are utilized for improving impedance matching across the targeted frequency bands. A prototype antenna is fabricated and characterized by measuring return loss and radiation patterns. Comparison of the measured and simulated results is given in the paper.
In this paper, we propose a PIFA based multiband internal antenna that can support seven frequency bands. The antenna is designed to operate at GSM (Global System for Mobile Communications, 880-980 MHz), PCS (Personal Communication... more
In this paper, we propose a PIFA based multiband internal antenna that can support seven frequency bands. The antenna is designed to operate at GSM (Global System for Mobile Communications, 880-980 MHz), PCS (Personal Communication Services, 1880-1990 MHz), UMTS (Universal Mobile Telecommunications System, 1.9-2.17 GHz), WiBro (2300-2390 MHz), Bluetooth (2.4-2.48 GHz), S-DMB (Satellite-Digital Multimedia Broadcasting, 2.630 ~ 2.655 GHz) and WLAN (Wireless Local Area Network, 5.16 ~ 5.5 GHz) frequency bands. Multiple frequency bands have been realized by using slots and quarter-wave length resonating strips. A matching stub and multiple short circuiting strips are utilized for improving impedance matching across the targeted frequency bands. A prototype antenna is fabricated and characterized by measuring return loss and radiation patterns. Comparison of the measured and simulated results is given in the paper.
IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY, VOL. 47, NO. 4, NOVEMBER 1998 1105 WCDMAThe Radio Interface for Future Mobile Multimedia Communications Erik Dahlman, Per Beming, Jens Knutsson, Fredrik Ovesjö, Magnus Persson, and Christiaan... more
IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY, VOL. 47, NO. 4, NOVEMBER 1998 1105 WCDMAThe Radio Interface for Future Mobile Multimedia Communications Erik Dahlman, Per Beming, Jens Knutsson, Fredrik Ovesjö, Magnus Persson, and Christiaan Roobol ...
... Mohammed Elmusrati and Heikki Koivo Control Engineering Lab. ... at 3.84 Mbit/s. The date rate is variable (15 Kbit/s 960 Kbit/s), this means that the processing gain is also variable (4 256) [9]. Actually there are a finite set... more
... Mohammed Elmusrati and Heikki Koivo Control Engineering Lab. ... at 3.84 Mbit/s. The date rate is variable (15 Kbit/s 960 Kbit/s), this means that the processing gain is also variable (4 256) [9]. Actually there are a finite set of processing gains which is used to get a finite set of ...
Supporting multiple traffic classes with different QoS (Quality of Service) constraints in third generation mobile systems is not a straightforward problem. This issue becomes critical at the access network interfaces, where transmission... more
Supporting multiple traffic classes with different QoS (Quality of Service) constraints in third generation mobile systems is not a straightforward problem. This issue becomes critical at the access network interfaces, where transmission resources are usually expensive. One of the most important interfaces is the one that connects each base station with its controller, because there can be many instances of it. We have approached the dimensioning of this interface from the perspective of simulation, concretely for the UMTS (Universal Mobile Telecommunications System) access network. At this respect we have developed a simulation model capable of representing multi-service scenarios inside this particular UTMS interface. This tool can be fed with traffic of different types, representing the different traffic classes defined for UMTS, and is able to simulate traffic differentiation both at ATM (Asynchronous Transfer Mode) and AAL2 (ATM Adaptation Layer 2) level. In the paper we presen...
A personal network is an overlay network which builds on different wireless networking technologies. This overlay network is responsible of glueing the different wireless networking technologies. In this paper, we consider the cooperation... more
A personal network is an overlay network which builds on different wireless networking technologies. This overlay network is responsible of glueing the different wireless networking technologies. In this paper, we consider the cooperation of two key technologies to realize a personal network, namely, wireless personal area network and universal mobile telecommunications system (UMTS). The co-operation poses a new set of problems as these technologies were not designed to interwork with each other. In this paper, we describe each of these problems and their solutions
Supporting multiple traffic classes with different QoS (Quality of Service) constraints in third generation mobile systems is not a straightforwar d problem. This issue becomes critical at the access network interfaces, where transmission... more
Supporting multiple traffic classes with different QoS (Quality of Service) constraints in third generation mobile systems is not a straightforwar d problem. This issue becomes critical at the access network interfaces, where transmission resources are usually expensive. One of the most important interfaces is the one that connects each base station with its controller, because there can be many instances
UMTS was envisaged as a "universal" mobile telecommunications system with multiple access options and full IP packet support. However, 3GPP Rel99 is a single access technology, and its core is still switch centric. Rel4 further optimises... more
UMTS was envisaged as a "universal" mobile telecommunications system with multiple access options and full IP packet support. However, 3GPP Rel99 is a single access technology, and its core is still switch centric. Rel4 further optimises the air interface. Rel5 first adds an IP multimedia core network sub-system (IMS) adjunct to the UMTS packet switched (PS) GPRS CN bearer. This adds basic PS call control trial capabilities. Rel6 will provide full UMTS packet call control (CC) capabilities (e.g.: security, emergency & QoS support). The Rel5/6 standards employ the text based call control protocol: SIP. Text based protocols are easier to develop than bit-wise presentations and likely to be more expediently taken to market. However, initial indications as to the delays associated with packet call control using SIP have concerned operators about the viability of IP-based services over a UMTS air interface. This has led UMTS vendors/operators to invest in the standardization of ways to wireless enable the efficient use of SIP with such measures as protocol compression. This paper explains GSM, UMTS circuit switched call control and SIP call control as applied to UMTS and then compares and contrasts the relative performance of both schemes using results derived from a UMTS system simulator called the Framework for Radio Architecture Modelling (FRAM).
In Europe, the challenge of the design of third-generation cellular mobile radio systems has been taken numerous research and development activities in this field have been started. The authors try to give an overview of the European... more
In Europe, the challenge of the design of third-generation cellular mobile radio systems has been taken numerous research and development activities in this field have been started. The authors try to give an overview of the European activities in this field. The article is organized in two parts. In the first part, the requirements for third-generation cellular mobile radio systems such as Universal Mobile Telecommunications System (UMTS) and Future Public Land Mobile Telecommunications System (FPLMTS), which has been named International Mobile Telecommunications after the year 2000 (IMT-2000) are presented concisely. Also, the importance and challenge of the multiple access design for such third-generation cellular mobile radio systems is explained. In the second part, numerous European research activities with focus on the multiple access design for third-generation cellular mobile radio systems are reviewed
In this paper, we propose a PIFA based multiband internal antenna that can support seven frequency bands. The antenna is designed to operate at GSM (Global System for Mobile Communications, 880-980 MHz), PCS (Personal Communication... more
In this paper, we propose a PIFA based multiband internal antenna that can support seven frequency bands. The antenna is designed to operate at GSM (Global System for Mobile Communications, 880-980 MHz), PCS (Personal Communication Services, 1880-1990 MHz), UMTS (Universal Mobile Telecommunications System, 1.9-2.17 GHz), WiBro (2300-2390 MHz), Bluetooth (2.4-2.48 GHz), S-DMB (Satellite-Digital Multimedia Broadcasting, 2.630 ~ 2.655 GHz) and WLAN (Wireless Local Area Network, 5.16 ~ 5.5 GHz) frequency bands. Multiple frequency bands have been realized by using slots and quarter-wave length resonating strips. A matching stub and multiple short circuiting strips are utilized for improving impedance matching across the targeted frequency bands. A prototype antenna is fabricated and characterized by measuring return loss and radiation patterns. Comparison of the measured and simulated results is given in the paper.
