Mobile users are facing the fact that many heterogenous radio access technologies coexist, ranging from wireless LANs to cellular systems. No technology has emerged as common and universal solution which makes the current trends today toward design of All-IP wireless networks, where radio cells are under the control of IP Access Routers for signalling and data transmission. In such as networks,...

This paper introduces a new technique for location management in cellular networks. It avoids the recording of moving tracks of mobile subscribers. The described procedures are derived from the well known untraceable MIX network and the distributed storage of location information according to GSM networks. 1 Terminology The served area of a cellular radio network is usually divided into locatio...

This paper presents a simulation approach to the object-oriented modelling of GSM cellular mobile networks implemented in the GSM CellSim++ simulation tool. Key aspects of this tool include: (i) the modelling of the random nature of radio wave propagation, mobile locations and user calling behaviour; (ii) modelling performance enhancing techniques such as frequency hopping, power control, and a...

Abstract– With limited frequency spectrum and a tremendous growth in the demand for mobile communication services, the problem of channel assignment becomes increasingly important. Efficient channel assignment allows for an increased utilization of the limited frequency spectrum available for land mobile radio-telephone service. In this paper, a new traffic-adaptive non-uniform compact pattern ...

In this paper a view of the world-wide developments in the field of wireless broadband multimedia communications is given first. Taking this into account, a multi-disciplinary approach is presented as a combination of: promising applications, novel user-interfaces, compression, protocols geared to the mobile user and transmission techniques that give abundant bandwidth to the user. The insights...

Double Reuse Digital Systems using Sectored Cells Yasuaki Kinoshita and David K. Asano Department of Information Engineering, Shinshu University, Nagano, Japan Abstract|To enhance frequency utilization e ciency, cellular mobile radio systems widely use a sector cell structure for the base stations. In this paper, the conceptual design formula previously reported are extended for frequency doubl...

This paper addresses an important issue on the spreading bandwidth of direct sequence code division multiple access (DS-CDMA) cellular mobile radio systems: does wider spreading bandwidth provide larger capacity? And if so, to what extent? The capacity of the perfect power controlled reverse link is evaluated by computer simulation for 1.25MHz and 5MHz spreading bandwidths under various sets of...

he public's desire for mobile communications and computing, as evidenced by the popularity of cellular phones, pagers, and laptop computers, combined with the rapid growth in demand for Internet access, suggest a very promising future for wireless data services. The key to realizing this potential is the development and deployment of high-performance radio systems. While many proposals for thir...

mobile phone use and wireless communication technology have grown explosively over the past decades. this rapid growth has caused widespread global concern about the potential detrimental effects of this technology on human health. stem cells generate specialized cell types of the tissue in which they reside through normal differentiation pathways. considering the undeniable importance of stem ...

mobile subscribers has increased much faster than anticipated. This trend is expected to continue in the future. According to the Universal Mobile Telecommunication System (UMTS) Forum [1], there will be around 400 million mobile subscribers worldwide in the year 2000 and almost 1800 million subscribers in the year 2010. In recent years, the number of subscribers to analog firstgeneration mobil...