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View All. Return form will be sent to your email Id:. Academic Texts. Programming Languages Books. In fact, not only do these issues need to be understood and addressed, their interdependence and interactions also deserve to be examined closely. Therefore, the goal of this workshop is to present papers addressing these issues, with the hope of stimulating further collaboration among researchers of various disciplines in wireless communications.

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High-speed wireless networks such as wireless ATM and GSM with high-speed data services continue to attract much research and development efforts. The major challenges on the physical and link layers in these networks include radio design, interference management, resource allocation and multiaccess protocol. Several papers on these issues are presented here.

As the availability of radio spectrum is limited, there is always a desire to ''maximize'' the spectral efficiency, for example, by diligent and perhaps dynamic re-use of frequency and cell layout, while guaranteeing a certain quality of service QoS.

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This information is used to anticipate the future location of the active users, thus, reduces the search space and, consequently, the cost of locating the user. Acknowledgements: Research under this topic was sponsored in part by:. Project Title: Multipath Routing. Project Title: Heterogeneous Networks. On the other hand, most of the mobile communication is implemented using a wireless infrastructure.

Thus, operation of the ATM protocol across wireless links is of particular interest.

One important aspect that needs to be considered is a way to maximize the utilization of the available bandwidth through the design of a Medium Access Control MAC scheme. MAC protocols, in general, and MAC protocols for wireless systems, in particular, have been extensively studied in the past.


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However, most of the previously investigated MAC protocols are designed for single-medium communications and turn out to be inadequate for transmission of intergrated , multiple-media traffic. Even though some claim that their existing MAC schemes support multimedia traffic, these schemes, in fact, were not designed with multimedia traffic characteristics in mind and, thus, only partially serve the goals of multimedia communications. Design of a new MAC scheme that will efficiently support an arbitrary mix of different and differing traffic types is the subject of this study.

In particular, our proposed scheme takes advantage of the bursty nature of the multimedia traffic, as to guarantee the required Quality of Service. Project Title: Asymmetric Protocols. Abstract: In this project, we advocate the use and propose the design of an asymmetric transport-layer protocol for mobile systems.

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Due to the ever increasing device integration density, physical dimensions of portable systems and devices continue to diminish rapidly. However, the computing power of the portable equipment does not increase at the same rate. Thus, to maintain a constant level of performance of mobile applications, there is the need to reduce the processing load of computing algorithms and communication protocols for mobile devices.

One approach to offload processing of communication protocol from a mobile device without sacrificing the performance and features is through the use of asymmetric design. In an asymmetrically designed protocol, peer functions are implemented through algorithms and procedures that are of substantially different complexity, with the lower complexity procedures used on the mobile device. We propose to devise and implement an example of such a communication protocol that provides the TCP functionality, yet places a significantly lower load on the mobile machine.

Mobile Communications

Abstract: This project addresses the issue of improvement in the wireless resource utilization; i. A centralized algorithm is proposed, the Centralized-Maximally Packed Channel Assignment C-MPCA , in which the measured information from mobiles and from base-stations is periodically conveyed to a central point in the network, where an optimal channel allocation is globally computed.

The computation of the channel allocation relies on call-related parameters, such as the requested quality of service e. In other words, the channel allocation algorithm is capable of controlling the relative quality of service e. In particular, it can assure that high-priority calls are neBecause of the centralized execution, instability of the assignments is avoided and significantly better performance i.

A preliminary study of the proposed scheme indicates that the number of required channels to satisfy some user population with some quality of service can be reduced by half, if the maximum packing scheme is implemented. Further investigation suggests that the improvement can be even more profound for future microcellular wireless networks. Before the location information of the database is recovered, phone calls may be lost.