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Vehicular ad hoc networks (VANETs) support safety applications to prevent car accidents. Beacons are periodically broadcasted for various safety applications but very sensitive to collision and delay. In this paper, we propose a new transmission scheme, called Bi-Beacon, which transmits two levels of power to reduce collision and maintain maximum transmission range. High collision problem still remains...
Vehicular industries have made constant efforts in developing cooperative vehicular systems to satisfy the needs for reducing car accidents and increasing traffic safety. In recent years, to satisfy these requirements, wireless communication-based vehicular ad hoc network (VANET) has been emerging as one of the promising solutions. Several research efforts have been conducted for developing the cooperative...
We propose opportunistic spectrum access methods of cognitive femto base station (BS) for time slot level operation after self-configuration and self-optimization processes. When a femto BS shares frequency channels with a macro BS, it performs spectrum sensing and accesses available frequency channels opportunistically. Partially observable Markov decision process (POMDP) and its suboptimal strategy...
Developing an accurate analytic model that takes into account various impacts of dynamic vehicular environments, such as mobility of vehicles, channel fading, and hidden vehicle problem, is necessary for the reliability analysis of vehicle-to-vehicle (V2V) safety communications. In this paper, we present existing analytic models of the IEEE 802.11p MAC protocol and point out their limitations and...
To increase traffic safety, automotive companies and governments have developed various kinds of technologies to support the needs of reducing traffic accidents during the past decades. To achieve this goal, vehicular ad hoc network (VANET) technologies have been getting the spotlight recently and extensive researches using VANET technologies have been carried out. Among them, decentralized congestion...
For decades, vehicular industries have made an investment in developing cooperative vehicular systems to satisfy the current and future needs for reducing car accidents and increasing traffic safety and efficiency on the road. To satisfy these requirements, vehicular ad hoc networks (VANETs) based on wireless communications have been emerging as one of the promising solutions in recent years. Several...
Low handover latency and IP session continuity are envisioned to be important factors for realizing next-generation all-IP heterogeneous wireless networks. To meet these constraints of the next generation networks, Proxy Mobile IPv6 (PMIPv6) has been considered as one of the IP mobility management protocols in recent years. Much research about the performance analysis of PMIPv6 has been done. However,...
The large-scale deployment of high density wireless sensor networks (WSNs) necessitates efficient organization of the networks for high network connectivity and low orphan node ratio. The multi-hop clustering technique has proven to be an efficient one for self-organizing thousands of randomly deployed sensors in a huge area. In this paper, we propose new clustering algorithms with a set of parameters...
Wireless sensor networks (WSNs) can be used by the military for a number of purposes such as monitoring or tracking the enemies and force protection. Unlike commercial WSNs, a tactical military sensor network has different priority requirements for military usage. Especially in the remote large-scale network, topology, self-configuration, network connectivity, maintenance, and energy consumption are...
Wireless sensor networks (WSNs) for tactical environments have been considered as the fundamentals for realizing the future combat system (FCS) supporting network-centric warfare (NCW). Much research related to tactical WSN architecture has been conducted. However, a research about randomly distributed WSNs for military tactical scenarios considering functionalities from bootstrap to data transmission...
Multi-hop wireless mesh networks (M-WMNs) have recently emerged as an alternative network infrastructure. For M-WMNs to serve as a network infrastructure, the protocol designs for M-WMNs should target a high network capacity. An efficient backoff algorithm is required to achieve a high network capacity. Most of existing works focused on backoff algorithms for infrastructure environment based on IEEE...
Wireless mesh networks (WMNs) are one of the key features of beyond 3G system because of their flexible and low-cost deployment. IEEE 802.16 mesh mode has recently emerged as an alternative protocol for establishing WMN. Because the WMN is used as wireless backbone network, the design of WMN protocol should target a high network throughput. Then, in IEEE 802.16 mesh standard, the performance improvement...
In this paper, an IEEE 802.11-based wireless mesh network testbed is developed to evaluate the performance of wireless mesh networks in real environment. The proposed testbed consists of mesh routers and mesh clients, where the mesh routers have minimal mobility and form the backbone of the wireless mesh network In order to build the proposed 802.11-based wireless mesh network testbed both an ARM-based...
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