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Reducing the location update cost has been a critical research issue since the location update process requires heavy signaling traffics. One of the solutions is employing the hierarchical structure in cellular networks to reduce the location update cost. This paper is not only to measure the average location update cost in cellular networks using the hierarchical structure but also to determine the...
IEEE 802.15.3 High-rate Wireless Personal Area Networks (WPANs) have been developed to communicate with devices within 10m at high speed. A mesh network made up of a parent piconet and several child piconets can support multi-hop communications. In this paper, we propose an efficient Channel Time Allocation (CTA) method and routing algorithm for multi-hop communications in IEEE 802.15.3 high-rate...
In this paper, we propose a novel optimization model to plan IEEE 802.11 broadband access networks. From a formal point of view, it is a mixed integer non-linear optimization model that considers both co-channel and inter-channel interference in the same compact formulation. It may serve as a planning tool by itself or to provide a performance bound to validate simpler planning models such as those...
Wireless Mesh Networks with static Transit Access Points (TAPs) have many advantages to connect different kinds of networks. While Mobile Ad hoc Networks still have many challenges to improve because of dynamic topology and security vulnerabilities, WMNs are the best solution for wireless communication recently. To utilize the characteristics of WMN’s topology, in this paper, we propose an algorithm...
In mobile ad hoc networks, the large amount of control overheads associated with discovering and maintaining end-to-end routing path information may not be tolerable. In this paper, we present the design and simulation of a new approach for IEEE 802.11 MAC based on the multipath routing information for ad hoc networks. The routing information about multiple paths discovered in the network layer is...
Wireless Mesh Networks (WMNs) with a promising future in wireless backhauling applications have attracted the attention of many network research centers and academic researches. High throughput and low delay as essential requirements of a wireless back-bone network demand new topology control algorithms as well as new optimization metrics. In this paper, a topology control algorithm compliant with...
Next Generation Network envisions convergence of different wireless networks to provide ubiquitous communication environment to the mobile user. The ubiquity is achieved by enabling a mobile user to switch to a network with better QoS (Quality of Service), by a mechanism called vertical handoff. We propose a vertical handoff management architecture which handles TCP adaptation and ensure efficient...
Mobile IPv6 permits the Mobile Node (MN) to maintain the continuous connectivity to the Internet when it moves from one access router to another. Due to both link switching delay and IPv6 protocol operation during the handover process, packets destined to the MN can be delayed or lost. This paper proposes a solution to improve the Mobile IPv6 handover performance over wireless network by introducing...
Hierarchical Mobile IPv6 (HMIPv6) was proposed by the Internet Engineering Task Force (IETF) for efficient mobility management of Mobile IPv6 nodes. In HMIPv6, when a mobile node moves access router in the different MAP domain, such a movement is called macro mobility handover. In this situation, the mobile node creates new RCoA and LCoA and performs registrations with the new MAP and HA. Especially,...
Vertical handoff is the key technology supporting session mobility in the future heterogeneous network environments. Based on the asymmetry feature of vertical handoff, this paper analyzes the handoff procedure of MIPv6 and mSCTP in forced and unforced handoff scenarios. Qualitative and quantitative analysis and comparison of the handoff performance including handoff delay, handoff packet loss and...
Energy efficiency is an important technology of sensor networks development. In this paper we offer a method of sensors lifetime maximizing under required level of network reliability. The optimizing statement is offered. As example, we consider homogeneous sensor networks with topology like tree. Other example concerns ZigBee technology. It shown that heterogeneous network can be improved by power...
Ad hoc networks can be used in scenarios such as military and emergency relief, and have the advantage of establishing communications independently. Securing the ad hoc routing protocol is necessary to prevent attacks in these applications. However, securing protocols for mobile ad hoc networks presents challenges due to energy consuming processes such as authentication of hosts and verification of...
Conventional TCP in wireless environment has a lack of ability to differentiate the packet losses caused by network congestion from those caused by wireless link error. When the packet losses are due to wireless link error, TCP performance degradation occurs because of its congestion control mechanism. This paper propose a sender-side TCP scheme for discriminating the cause of packet losses. Simulation...
With the technological growth of the AV(Audio and Video) equipments and the popularization of video contents, IEEE1394 for the transmission of AV data has spread fast. However, DLNA(Digital Living Network Alliance), which is a standard of the home network middleware, does not consider the transmission of AV data over IEEE1394. In this paper, we propose a scheme for transmission of AV contents over...
In this paper, we propose an efficient measurement of the eye blinking for drowsy driver detection system that is one of the driver safety systems for the intelligent vehicle. However, during the real driving in the daytime, driver’s face is exposed to various illuminations. It makes too difficult to monitor driver’s eye blinking. Therefore, we propose efficient formation of the cascaded form of Support...
Ethernet passive optical network (EPON) is a low-cost and high speed solution to the bottleneck problem. We study previous inter-optical network unit (ONU) scheduling algorithm, interleaved polling with stop (IPS).The IPS algorithm needs an idle time period between two consecutive frame transmission cycles on uplink. In this paper, we propose a two-phase cycle dynamic bandwidth allocation (TCDBA)...
The IEEE 802.11 standard basically uses a DCF (Distributed Coordination Function) to access a wireless channel. However, the DCF uses wireless resource ineffectively when there are many contending stations and a high bit error rate. To enhance the performance of the wireless LAN, Ki et al. proposed a Binary Negative-Exponential Backoff (BNEB) algorithm. We found that the performance of the BNEB algorithm...
This paper presents an efficient rough set based anomaly detection method that can effectively identify a group of especially harmful internal attackers – masqueraders in cellular mobile networks. Our scheme uses the trace data of wireless application layer by a user as feature value. Based on this, the use pattern of a mobile’s user can be captured by rough sets, and the abnormal behavior of the...
In this paper, we apply multiple antennas to MB-OFDM UWB system for high performance. With an emphasis on a preamble design for multi-channel separation, we address the channel estimation in MB-OFDM system with multiple antennas. By properly designing each preamble for multiple antennas to be orthogonal in time domain, the channel estimation can be applied to the MB-OFDM proposal for IEEE 802.15.3a...
The rapid growth of wireless communication technology has spurred various mobile applications. In this paper we propose a scheme which can improve the PSNR of multimedia data transmission using the RTP/RTCP. It is achieved by adjusting the compression rate according to the packet loss rate, delay, or jitter in the network. The NS-2 simulation reveals that the proposed approach shows a significant...
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