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Mobile Ubiquitous Network (MUN) is an integrated network that consists of cellular network, gateways (GWs), as well as local networks. In such heterogeneous environment, GWs deserve much attention since they act as bridges to connect local networks and cellular network to realize global communication. In this paper, we study the issue of GW discovery and especially focus on the scope of GW information...
This paper presents an AP selection strategy in the office environment covered by WLAN. While most of the selection metrics balances the active load among neighboring BSSs, the quality of voice applications greatly depends on the call blocking probability which is decided by all the potential voice STAs. For this reason, we define a QoS-aware information element that is advertised from APs. On this...
With the wide deployment of wireless local area networks (WLANs), the problem of configuration and maintenance of access points (APs) arises. The traditional manual configuration method greatly increases the cost of configuration and maintenance of the WLANs system and hinders the scalability of WLANs. The plug-and-play (PnP) of APs, which means that APs auto-configure themselves based on the network...
Network coding has attracted much interest recently since considerable research indicates that it can offer significant capacity gains. This paper applies network coding to mobile ad hoc networks, especially for large scale content distribution, where each network node is able to generate and transmit encoded blocks of incoming information. Furthermore, it introduces a novel scheduling approach named...
It is of paramount importance to obtain accurate node positions in ad hoc networks for various location-based services. Hop-count based localization provides a low-cost and efficient approach to yield the node locations with moderate accuracy. In this paper, an enhanced hop-count based localization algorithm, Segmentation-aided and Density-aware Hop-count (SDH), is proposed to improve the estimation...
This paper presents an access point (AP) selection strategy for the (re)association procedure in large-scale WLAN. The proposal considers the difference of node topology among candidate basic service sets (BSSs), wherein the effects from hidden terminals are emphasized due to its significant impact on throughput degradation. Comparing with existing mechanisms, the proposal combats load imbalance problem...
Energy is a critical and challenging issue for battery-constrained devices, especially for mobile ad hoc stations, which are responsible for relaying data packets for neighbor nodes. Therefore, considerable research has been devoted to the research of energy consumption efficiency. Care has been taken not only to reduce the overall energy consumption but also to balance individual battery usage, since...
As a result of WiFi explosion, interworking between the cellular system and WLAN is drawing much attention. In pervious studies the dual mode gateways (GWs) are assumed while ignoring the increased power consumption to serve both networks. This results in serious energy challenge when battery-charged mobile terminals act as GWs in future ubiquitous environment. To address this issue, we propose a...
Multiple route information is often necessary for ad hoc networks, to recover from quick topology and link status change, and to support load balanced multi-path routing as well as QoS consideration. However, most such research focused on multiple routes utilization or specific QoS metric design, and few of them consider how to obtain such multiple route information efficiently. In this paper we propose...
The major challenge in future heterogeneous wireless networks is to promote the network welfare by well designing the radio resource management (RRM). Due to the similarity of both the ecological system and the heterogeneous wireless networks on the competitiveness, we propose a novel ecology-based adaptive network control (EBANC) scheme for RRM to optimize the network revenue, which introduces the...
WLAN is becoming a promising system for future mobile ubiquitous network. However, the performance is largely restricted by MAC inefficiency, and AP remains as a bottleneck in infrastructure WLAN. A high efficient MAC, which decreases frame collision and balances the performance between AP and stations, is desirable. Therefore, we proposed an interactive pair scheduling (IAPS) scheme compatible with...
Broadcasting is an indispensable operation for multi-hop mobile ad hoc network (MANET) to provide control or routing functionalities. In MANET, since a packet relayed by any node can reach all its neighbour nodes, broadcasting by flooding is inefficient and results in many redundant relays. In this paper, we analyze the deficiencies of some previous broadcasting protocols and propose two enhanced...
The secondary market spectrum policy adopted by FCC opens the opportunities of flexible spectrum leasing and transfer between wireless network providers (NPs). When trading and allocating spectrum with the emerging market-oriented approach, the wireless NPs need to consider the economic influence when determining the needed spectrum. This paper proposes flexible spectrum allocation (FSA) methods for...
Floating production, storage, and offloading (FPSO) systems have been used for the development of offshore oil and gas fields. This paper presents a methodology for the time-variant reliability assessment of FPSO hull girders subjected to degradations due to corrosion and fatigue. The corrosion defect is modeled as an exponential time function with a random corrosion rate. When corrosion occurs, the...
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