Abstract The areas of positioning and tracking through Wireless Sensor Network (WSN) have received considerable attention recently driven by the requirement to obtain high positioning accuracy with minimum cost possible. A wide range of proposed approaches regarding the positioning area have emerged, however most of them suffer from either requiring an extra sensor, high power consumption, inaccessible indoors, or offer high positioning error.... The areas of positioning and tracking through Wireless Sensor Network (WSN) have received considerable attention recently driven by the requirement to obtain high positioning accuracy with minimum cost possible. A wide range of proposed approaches regarding the positioning area have emerged, however most of them suffer from either requiring an extra sensor, high power consumption, inaccessible indoors, or offer high positioning error. This paper presents a research and development of an adaptive positioning system for ZigBee WSN based on the Received Signal Strength (RSS) system. The proposed system is an efficient positioning system in both indoors and outdoors, where it offers reasonable positioning accuracy (0.1 – 0.6) meters, and achieves low power consumption. The proposed system has been validated through a number of real experiments using XBee modules. Read More Read Less

Abstract Mobile WiMAX access network is being developed to support various multimedia services such as mobile Internet Protocol Television (IPTV), mobile Video-on-Demand (VoD), and mobile Internet services. In multimedia systems, one of the major challenges is how to reduce a channel change response time. In order to solve this problem, many methods have been proposed. In this paper, we propose Cross-Layer Optimization and System... Mobile WiMAX access network is being developed to support various multimedia services such as mobile Internet Protocol Television (IPTV), mobile Video-on-Demand (VoD), and mobile Internet services. In multimedia systems, one of the major challenges is how to reduce a channel change response time. In order to solve this problem, many methods have been proposed. In this paper, we propose Cross-Layer Optimization and System Architecture of Multicast Broadcast Service (MBS) over mobile WiMAX. Proposed method reduces the channel change response time efficiently as viewers watch mobile IPTV channels without IGMP join process when those are shared. Simulation results show that the channel change response time is significantly decreased compared to the existing MBS architecture. Read More Read Less

Abstract In Wireless Mesh Networks (WMNs), supporting Quality of Service (QoS) to enable a rich portfolio of applications/real-time multimedia applications is foreseen to be vital for the success of next generation networking technologies. However, today’s cutting edge standards are not perfectly equipped to cater to this task. These standards come with an inherent complexity and suffer from innate problems with respect to QoS provisioning.... In Wireless Mesh Networks (WMNs), supporting Quality of Service (QoS) to enable a rich portfolio of applications/real-time multimedia applications is foreseen to be vital for the success of next generation networking technologies. However, today’s cutting edge standards are not perfectly equipped to cater to this task. These standards come with an inherent complexity and suffer from innate problems with respect to QoS provisioning. Consequently, due to the limited resource of WMNs and increasingly demand of new applications, there is a need for devising innovative routing algorithms for supporting QoS on top of the existing standards. Thus, this paper presents a cross layer relay node selection scheme for routing protocols in order to offer optimal routes to real-time applications. Distinguished from guaranteeing a certain level of performance, our QoS scheme provides differentiated priorities and service levels to application with different needs. The scheme includes two parts. In the first part, we present an application priority model to update the application/ priority table from the gateway periodically. Secondly, a new routing metric combining application priority, channel busy level and hop count, is deployed to evaluate and select the best from plurality possible paths during the communication phase. Our simulation experiments confirm the superiority of the proposed scheme against a number of existing counterparts. Read More Read Less

Abstract In WSN, most existing mechanism around data gathering and optimal path selection result in collision. Collision further increases the possibility of packet drop. So the need is to eliminate collision during data aggregation. This research is an effort to come up with a reliable and an energy efficient Wireless Sensor Network (WSN) routing protocol. To find the rendezvous point for optimal transmission of... In WSN, most existing mechanism around data gathering and optimal path selection result in collision. Collision further increases the possibility of packet drop. So the need is to eliminate collision during data aggregation. This research is an effort to come up with a reliable and an energy efficient Wireless Sensor Network (WSN) routing protocol. To find the rendezvous point for optimal transmission of data a “Splitting tree” technique is employed in tree-shaped network topology and then to determine all the subsequent position of a sink the “ Biased Random Walk” model is used. In case of an event, the sink gathers the data from all the source, when they are in the sensing range of rendezvous point. Otherwise relay node is selected from its neighbor to transfer packets from the rendezvous point to sink. The proposed routing protocol simulation results proves there is significant improvement in preventing data collision and increase in the network lifetime compared with other routing protocol. Read More Read Less