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To mitigate performance anomalies due to different transmission rates and improve throughput performance in ad-hoc networks, we propose a method called user cooperative mobility in which a node, i.e., a user of an ad-hoc network, moves (changes its geometrical position) for communication. Unlike previous research regarding user cooperative mobility, it is not easy to decide to where the user should...
The advanced wireless technologies make vehicle-to-vehicle communication possible. However, vehicular network has a limitation in terms of network topology rapidly change, which causes discontinuous connection. To support seamless connection, horizontal and vertical handovers are required. The good handover mechanism should take network parameters, user requirements, and application QoS into account...
Mobile ad hoc networks (MANETs) are collection of mobile nodes communicate in a multi-hop manner without relaying on any infrastructure or central administration. Multimedia and group-oriented applications over MANETs gain high popularity, which makes providing quality of services (QoS) a key requirement. This work proposed a new efficient approach which aims to find paths between the source and all...
In this paper, we analyze the efficiency of resource occupied by QoS management messages in the converged wireless networks. Handover blocking may be generated by radio resource limitation when a number of QoS management messages are transferred between nodes simultaneously. So, the analysis of bandwidth occupied by QoS management messages is required to prepare the solution for handover blocking...
The increasing popularity of mobile wireless networks and various numbers of wireless networks becomes an important challenge. The future generation of wireless networks is expected to integrate a potentially large number of heterogeneous wireless technologies in what could considered a huge step toward universal seamless access. The topology management became here one of the main challenges. Efficient...
With the IEEE 802.16e standard for mobile WiMAX the course for new 4G mobile radio communication systems is set. It offers significantly higher data rates than GSM or WCDMA/UMTS and supports different handover mechanisms and QoS features in contrast to WiFi (IEEE 802.11 g) on the OSI-layer 2 (L2). Since WiMAX-devices are hardly available today and protocol optimizations are strongly restricted with...
The mean number of handoffs is a fundamental performance measure in any mobile system, as it directly relates to the signaling load in the network as well as to the delivered QoS. As the mobile services are evolving from simple cellular voice calls towards media and data sessions, and as cellular providers are reinventing their businesses by incorporating third party services, the handoff rate will...
A distributed scheduling approach for fast deployable tactical IEEE 802.16e networks is presented where distributed base stations with dual radios form a mesh backhaul and mobile battle units communicate through these base-stations. The mesh backhaul is formed via an IEEE 802.16e mesh mode radio on each base station, while mobile units communicate with base stations via PMP mode radios. The scheduling...
In this paper, we study medium access control (MAC) protocols with quality-of-service (QoS) support, that is, topology-independent link activation transmission scheduling, for mobile code-division multiple-access (CDMA) ad hoc networks. QoS provisioning for each communication link is guaranteed without the need to adopt transmission schedules in mobile environments. An interference model, which captures...
According to the mobility framework of IEEE 802.16e, a mobile station (MS) should scan the neighbouring base stations (BSs), for selecting the best BS for a potential handover activity. However, the standard does not specify the number of BSs to be scanned leaving room for unnecessary scanning. Moreover, prolonged scanning also interrupts data transmissions thus degrading the QoS of an ongoing connection...
The following topics are dealt with: IP network security; wireless security; network topology; power line communication; intelligent transportation; cryptography; P2P streaming; wireless communication; wireless channel; network traffic; routing protocol; security protocols; resource management; ad hoc network; wireless sensor network; MAC protocol; power control; QoS; scheduling; coding; modulation;...
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