Delay Time Analysis and Energy Consumption Issues in Short Range Wireless Transaction System

ABSTRACT: Bluetooth is a promising short range wireless personal area network technology and is on the verge of being ubiquitously deployed over a wide range of devices. The basic unit of a Bluetooth network is a centralized master-slave topology, namely a piconet, which can be easily extended into a multi-hop adhoc network called a scatternet. Scatternets increase Bluetooth's usability multi-folds such that numerous applications may be built over them to unleash the potential of Bluetooth. When more than seven devices to be connected in a Bluetooth scatternet, bridge devices are used to connect two piconets into a scatternet. To deal with possible data transmissions between different piconets, the bridge device must switch to different masters frequently. This may cause traffic in network. Our work tries to explore a less popular but powerful applications of Bluetooth which can help extend the range of Bluetooth communication and provide a free infrastructure for communication and find the transaction delay in Bluetooth network. Our approach is to design a transaction system that can be used to emulate and test the path selection from plentiful paths available from source to the destination. At the same this it assist user to select the optimal path. Due to this innovative approach; in transaction system it cause less traffic and it resultant in to less delay. Our work also analyzes the end-to-end packet delays, cumulative delay for both intra-and inter-piconet traffic and energy consumption, in a Bluetooth scatternet. Finally, we conduct simulations by using eclipse and NS-2 to demonstrate the efficiency and effectiveness of the proposed transaction system

CBS: constraint-based approach for scheduling in bluetooth networks

In Bluetooth networks, devices are organized into small piconets and large scatternets, and each node acts as the role of master, slave or gateway. Due to dynamic topology changes, different bandwidth available and unpredictable interference of media in Bluetooth networks, the congestion of data flow will inevitably emerges on the link, and the gateway has to switch between piconets on a time division basis, so its presence in the different piconet has to be controlled by scheduling mechanism such as inter- and intra -piconet scheduling. However, the time division in gateways will limit the network capacity and introduce bottleneck points in the network, and the switch between piconets will prevent the packet from transmitting smoothly and efficiently. Most of the published work on Bluetooth scheduling has focused on the polling scheme between master and slaves. In this paper, we put our approach on the inner constraints of Bluetooth networks and present a constraint-based scheduler (CBS), to adaptively cater to the changing role of each node throughout Bluetooth ad hoc networks, thereby it will save time and definitely enhance fairness and efficiency on packet scheduling in Bluetooth environment.Facultad de Informátic

Mobile Ad hoc Networking: Imperatives and Challenges

Mobile ad hoc networks (MANETs) represent complex distributed systems that comprise wireless mobile nodes that can freely and dynamically self-organize into arbitrary and temporary, "ad-hoc" network topologies, allowing people and devices to seamlessly internetwork in areas with no pre-existing communication infrastructure, e.g., disaster recovery environments. Ad hoc networking concept is not a new one, having been around in various forms for over 20 years. Traditionally, tactical networks have been the only communication networking application that followed the ad hoc paradigm. Recently, the introduction of new technologies such as the Bluetooth, IEEE 802.11 and Hyperlan are helping enable eventual commercial MANET deployments outside the military domain. These recent evolutions have been generating a renewed and growing interest in the research and development of MANET. This paper attempts to provide a comprehensive overview of this dynamic field. It first explains the important role that mobile ad hoc networks play in the evolution of future wireless technologies. Then, it reviews the latest research activities in these areas, including a summary of MANET\u27s characteristics, capabilities, applications, and design constraints. The paper concludes by presenting a set of challenges and problems requiring further research in the future

Capacity Assignment in Bluetooth Scatternets - Analysis and Algorithms

Bluetooth enables portable electronic devices to communicate wirelessly via short-range ad-hoc networks. Initially Bluetooth will be used as a replacement for point-to-(multi)point cables. However, in due course, there will be a need for forming multihop ad-hoc networks over Bluetooth, referred to as scatternets. This paper investigates the capacity assignment problem in Bluetooth scatternets. The problem arises primarily from the special characteristics of the network and its solution requires new protocols. We formulate it as a problem of minimizing a convex function over a polytope contained in the matching polytope. Then, we develop an optimal algorithm which is similar to the well-known flow deviation algorithm and that calls for solving a maximum-weight matching problem at each iteration. Finally, a heuristic algorithm with a relatively low complexity is developed