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Full-Text Articles in Physical Sciences and Mathematics
Adaptive Self-Organisation Of Wireless Ad-Hoc Control Networks, Fazel Naghdy, Nathan Simiana
Adaptive Self-Organisation Of Wireless Ad-Hoc Control Networks, Fazel Naghdy, Nathan Simiana
Faculty of Informatics - Papers (Archive)
A novel concept called Wireless ad-hoc Control Networks (WACNets), exploring an ad-hoc approach to networked distributed control, has been under study for the last five years in the research group. Such systems represent a new stage in the evolution of distributed control and monitoring. The work carried out in developing an adaptive self-organisation algorithm for WACNet is reported. The algorithm deploys a distance measure technique while satisfying the rules and assumptions developed for WACNet framework. The effectiveness of the algorithm is verified through computer simulation under a number of given scenarios. The results obtained show that the algorithm effectively drives …
Research On Bandwidth Reservation In Ieee 802.16 (Wimax) Networks, Yi Sun, Yilin Song, Jinglin Shi, Eryk Dutkiewicz
Research On Bandwidth Reservation In Ieee 802.16 (Wimax) Networks, Yi Sun, Yilin Song, Jinglin Shi, Eryk Dutkiewicz
Faculty of Informatics - Papers (Archive)
According to the characteristics and QoS requirements of different types of service flows, this paper proposes a dynamic, prediction-based, multi-class, adaptive bandwidth reservation scheme for IEEE 802.16 (WiMAX) networks. The scheme adopts different bandwidth reservation and admission control policies to different types of service flows and therefore guarantees that the real-time sessions have higher priorities than non real-time sessions and that handover sessions have higher priorities than new sessions. In addition, a bandwidth reservation adaptation algorithm is also proposed. The algorithm adjusts the amount of bandwidth reserved for handover sessions according to the current network conditions thus creating a balance …
Ber-Delay Characteristics Analysis Of Ieee 802.15.4 Wireless Sensor Networks With Cooperative Mimo, Mohd Riduan Bin Ahmad, Eryk Dutkiewicz, Xiaojing Huang
Ber-Delay Characteristics Analysis Of Ieee 802.15.4 Wireless Sensor Networks With Cooperative Mimo, Mohd Riduan Bin Ahmad, Eryk Dutkiewicz, Xiaojing Huang
Faculty of Informatics - Papers (Archive)
This paper presents a study of the impact of transmission delay differences between co-operating nodes on bit error rate performance and energy consumption of wireless sensor networks. We consider a wireless sensor network using an Alamouti virtual MIMO (multiple-input multiple-output) configuration between collaborating nodes operating in quasi-static Rayleigh flat-fading channels. Our results show that above certain delay difference (in the range above 0.75Tb), the traditional non-cooperative approach is more energy-efficient than the cooperative strategy and that the transmission delay difference has the most significant on the transmission energy consumption in the delay range of below 0.75Tb.
Scalability Of Manet Routing Protocols For Heterogeneous And Homogenous Networks, Huda Mubarak Al Amri, Mehran Abolhasan, Tadeusz A. Wysocki
Scalability Of Manet Routing Protocols For Heterogeneous And Homogenous Networks, Huda Mubarak Al Amri, Mehran Abolhasan, Tadeusz A. Wysocki
Faculty of Informatics - Papers (Archive)
In Mobile Ad hoc Network (MANET), mobility, traffic and node density are main network conditions that significantly affect the performance of routing protocols. Much of the previous researches in MANET routing have focused on developing strategies, which suit one specific networking scenario. Therefore, there is no existing protocol that can work well in all different networking scenarios. This paper reviews characteristics of each different classes of routing protocols. Moreover, most of current routing protocols assume homogeneous networking conditions where all nodes have the same capabilities and resources. Although homogenous networks are easy to model and analysis, they exhibits poor scalability …