http://nova.newcastle.edu.au/vital/access/services/Feed ${session.getAttribute("locale")} 5 http://nova.newcastle.edu.au/vital/access/manager/Repository/uon:8697 The opportunities and applications for a large group of coordinating autonomous underwater vehicles (AUV) is exciting and provides greater exploration opportunities than fixed sensor nodes or using a single AUV. The work presented in this paperis the development of a Medium Access Control Protocol for a cluster of small autonomous vehicles working in a centralized network topology. Acoustic communication links are typically used for underwater operations, however are substantially imited by the physics of acoustic propagation which require essentially new scheduling protocols to those being used and developed for packet radio networks. This paper provides a discussion and overview of the essential issues for developing a new MAC protocol for a cluster of closely operating underwater vehicles and presents some performance results for a proposed Adaptive Token Polling Protocol. 2012-06-05T01:32:13.974Z ]]> http://nova.newcastle.edu.au/vital/access/manager/Repository/uon:6777 The IEEE 802.11 suite of WLAN standards are evolving to support an increase in emerging broadband multimedia applications, with their popularity attributed to simple, scalable and cost effective wireless broadband communication infrastructure. However, the most widely deployed generation of 802.11x based MAC protocols provide limited support for multimedia traffic, as no guarantee is provided on the quality of service (QoS) that a particular type of traffic will receive. Furthermore, the legacy 802.11 MAC exhibits high protocol overhead due to control frames, channel access, and the probability of contention. This article presents an overview of MAC layer enhancements designed to provide QoS support and higher throughputs in next generation WLANs, including IEEE 802.11e and 802.11n standards. Comprehensive simulation results are provided using an OPNET simulation model. 2010-09-24T01:10:14.553Z ]]> http://nova.newcastle.edu.au/vital/access/manager/Repository/uon:6780 This paper presents an adaptive bandwidth management technique to improve the transmission efficiency of a high speed downlink packet access (HSDPA) network by adaptively allocating radio access network resources. The radio access network resources are allocated based on the air interface demand. The proposed bandwidth management technique is evaluated by an analytical and a simulation model. Both analytical and simulation results show that the proposed algorithm improves the Iub link utilization, and keep high the HSDPA air interface resource utilization by jointly optimizing the resource allocation processes. 2010-09-24T01:10:12.035Z ]]>