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During last two decades, Mobile Ad hoc Networks (MANETs) has been in widespread use. However, in some critical applications such as in battlefield or area sensing, due to the node mobility, limited power and sparse deployment density, MANETs may suffer network partitioning. Without a stable end to end path, these challenged scenarios could cause most existing ad hoc networks protocols to fail. In...
Handover happens among access points which not only belong to the same network, but also belong to various networks. Handover decision algorithm is one of key issues which decides when and how handover happens. In this paper, a novel handover decision algorithm shielding physical realization of various networks is proposed, which uses GRA (Grey Relational Analysis) method and GPS(Global Position System)...
Quality-based routing protocols are proposed to restrict message flooding within only high quality nodes in delay tolerant networks (DTNs). However, different quality threshold mechanisms have diverse impact on the network and we investigate this issue in the paper. Through theoretical analysis we show that heterogeneous threshold mechanism suffers a severe nodal cost imbalance problem. Furthermore,...
Roadside units (RSUs) aided certificate service is a promising approach for ensuring security and privacy preservation in vehicular ad hoc networks (VANETs). In existing approaches, a vehicle can update certificate only when it passes by RSUs, however, this is impractical in many scenarios. Consequently, if there are no RSUs on the original driving trip, drivers have to adjust routes which means wasting...
To support network mobility in wireless network, NEMO BSP is proposed by IETF. Mobility support paradigm is going to move from the MN to Network. PMIPv6 is the latest protocol based on local mobility management and network-based mobility. The mobile node can freely move between PMIPv6 network and mobile network. The previous NEMO protocols based on PMIPv6 cannot support this kind of mobility due to...
This paper proposes a new fuzzy-based multi-rate STBC transmission method over dynamic fading channels in order to have an optimal channel usage and to control performance according to the instantaneous channel situations. The proposed method employs a fuzzy inference system (FIS) over estimated average delay and minimum value of cost function designed for Alamouti code in each block decision. We...
This work considers systems with inactivity periods of unknown duration. We study the question of scheduling ??waking up?? instants in which a server can check whether the inactivity period is over. There is a cost proportional to the delay from the moment the inactivity period ends until the server discovers it, a (small) running cost while the server is away and also a cost for waking up. As an...
How to control energy consumption is one of the most important issues for the battery-powered mobile stations in mobile networks. IEEE 802.16e standard proposes an energy saving mechanism that named "sleep mode" for conserving the power of the mobile stations. According to the operating mechanism of the sleep mode for downlink traffic in the type I power saving class, modeling the data frames...
Researching on delay tolerant networks is an emerging field. Many researchers are dedicated to the approach of the routing algorithms and its applications. With sufficient energy in the core-nodes in the networks, a nested source spray and wait routing algorithm, which is ameliorated from source spray and wait routing algorithm, has been put forward in this paper. The simulation results indicate that...
Mobile users are often involved in team activities and exhibit collaborative mobility in realistic ad hoc network application scenarios. Due to diverse group mobility patterns, the network may remain partitioned for extended durations. This paper describes an approach to reduce the communication disruptions by deploying forwarding nodes. The forwarding nodes explore the field periodically in orderto...
An 88% reduction of refresh power of the 65 nm embedded DRAM is achieved using super retention mode (SRM) with word line data mirroring (WLDM). The retention time in super retention mode is measured in the range of 0.55 V to 1.2 V. The minimum refresh power is obtained at 0.6 V. The retention time of super retention mode at 0.6 V is extended by 4.1 times from that of conventional single cell operation...
In mobile ad hoc networks (MANETs), time synchronization can be achieved by distributing time information among nodes. This type of time synchronization, however, does not work well under considerable long delay caused by sparse population. In this paper, we propose a simple yet effective scheme for relative time synchronization. When two mobile nodes meet, they exchange their clock information and...
One of the main challenges in all-IP networks is the development of suitable mobility solution. Mobile IP (MIP) presents the standard protocol used to support IP mobility. However, MIP is inadequate for real-time applications and inter-domain mobility (when a mobile node performs handover between two autonomous systems (AS)). In this paper, we propose an efficient approach to manage inter-domain handover...
Data forwarding in the wireless networks typically employs a sender-oriented approach in which the next hop node is pre-selected based on neighbor or network information. This method incurs large overhead when accurate information is needed for making the optimal forwarding decision. In this paper, a receiver-oriented robust data delivery scheme (RRDD) is proposed for mobile sensor networks. In RRDD,...
Nowadays applications of ETC (Electronic Toll Collection) are making a revolution in traffic charging. However, there are still some problems, such as the costs of redundant stations and network construct, the costs of the expensive devices, inconvenience in travels across provinces and so on. Meanwhile, the mobile telecommunication networks in China have got a country-wide coverage as they cover...
In intermittently connected networks, epidemic routing protocols have been widely used as its simplicity and reliability. However, this kind of protocols will make the same message cover most of the nodes in networks which causes a huge waste of network resources. Therefore, this paper proposes a new routing protocol named epidemic routing based on separation time with forwarding tokens constrained...
Some mobile multicast schemes have been proposed in the past few years, but most of them study the reconstruction of multicast delivery tree, but little consider the mobile group membership management. In this paper, we propose a new mobile multicast method based on Two-Hop Multicast Listener Discovery (THMLD) protocol which provides the mobile multicast membership management function by forwarding...
The Quality of Service (QoS) is already a major concern for operators, but things are changing and, although in many cases better QoS results in better Quality of Experience (QoE), fulfilling the required performance parameters is not a synonym of satisfied users. QoE conditions can immediate response on the user satisfaction and thus the goal of QoS assurance should be to promote a better QoE. This...
As integration of heterogeneous networks has become one of the most important characters for next-generation networks, it becomes a very challenging issue to ensure effective handoff when mobile node moves between different heterogeneous networks. In this paper we propose an effective handoff mechanism based on location information. By processing geographical data (consisting of information about...
This paper deals with agent location and loss detection in a mobile agent based workflow automation scheme. A protocol for population control of agents evolving through Internet is proposed. It is supported by the handling of allowed timing in agent mission execution, allowing passive and active termination of agents, opportune localization of agents and orphan detection. The protocol is specified...
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