Atd Munro

Ad-hoc wireless networking: contention free multiple access using token passing

Discusses mobile broadband communications with project groups such as ETSI RES 10 and ESPRIT LAURA providing much of the input. The immediate application of such systems would hope to provide high speed data links for users within a small location area and as such would have to be capable of overcoming the significant problems that the radio channel imposes. The authors discuss LANs and MAC protocols.

Efficient mobility management: a flexible design algorithm

This paper presents a dynamic anticipatory mobility management algorithm which can be easily implemented and integrated in mobile handsets, providing efficient mobility management for personal communications and mobile computing. Performance evaluations show that the proposed algorithm will reduce mobility signalling traffic and therefore increase the existing wireless system capacity with minimum change in the network.

SMMT - Scalable Mobility Modeling Tool

In this paper, we present a novel mobility model, called the Scalable Mobility Modeling Tool (SMMT), which is based around a scaleable algorithmic mobility model that can be applied to a large number of possible horizontal environments, from wide area networks (WAN) to local area networks (LAN), to analyze the issues related to mobility management and radio resource management. The SMMT introduces the new concept of poles of gravity (PG) to characterize the spatial and temporal behavior of mobile users in a scaleable way. This technique has been applied to a cellular communications system superimposed on different geographical frameworks consisting of the City Area Model and City Center of Bristol, UK, to investigate the performance issues related to location and paging area and teletraffic issues respectively.

Importance of accurate mobility modeling in teletraffic analysis of the mobile environment

This paper shows the importance of taking into account accurate mobility effects in performance evaluation of key teletraffic metrics of mobile communication networks. To accomplish the task, we introduce a new discrete stochastic node, the pole of gravity characterizing the temporal and spatial behavior of mobile users. This novel concept forms the realm of our mobility model termed as scalable mobility model (SMM) and provides a realistic set of paths traversed by subscribers on a daily basis by taking into account attraction points, geographical environments, time factor and grouping individual subscribers into specific classes of mobility. Using this approach, we demonstrate the need and importance of taking mobility-related factors in the analysis of teletraffic issues by investigating the signaling and traffic related parameters such cell residence time and traffic load. Our simulations results include a comparative performance of SMM against the well known random way point model for same performances issues for the City Area of Bristol, UK during the rush and busy hour.

Performance methods for mobility management in cellular networks

This paper presents performance methods for mobility management in cellular networks. A queueing analysis is first undertaken, in which the system is modelled as an open Jackson network, consisting of M M/M/1 queues. Given environmental parameters, the corresponding probability matrix is obtained, and hence the traffic matrix equations. From these equations, the traffic load in each cell is evaluated. Secondly, a BONeS DESIGNER simulation model is created and applied to the evaluation of mobility processing load. One case study has been made on Cellular Digital Packet Data (CDPD) networks. The results from both analysis and simulation are similar. It is important to note that the proposed traffic analysis approach may also be used for evaluating and analysing other signalling traffic in cellular networks.

Secure content distribution to mobile users

The purpose of this paper is to describe the advantages of using an application layer mechanism based on digital containers for end-to-end security. This approach is independent of the underlying network infrastructure, should scale well to a large number of small transactions (microtransactions) from a large number of consumers and is particularly suited to efficient account based micropayments systems. The paper concludes with a brief description of the SIBIS system, a Java based example implementation of the digital containers architecture, developed during the DTI/EPSRC Link Broadcast project SIBIS. (4 pages)

WIN with OSI, the sequel: A Case Study of TETRA Digital Private Mobile Radio.

The increasing deployment of computer-networking services in fixed networks motivates the provision of similar services in wireless networks. In the case of PMR systems there are already several types of data communications service (MOBITEX, MPT1327, Motorola RD-LAP for example).