The Experts below are selected from a list of 12207 Experts worldwide ranked by ideXlab platform

Shinsuke Tanaka - One of the best experts on this subject based on the ideXlab platform.

  • improving end to end delay through load balancing with multipath routing in ad hoc wireless networks using Directional Antenna
    Lecture Notes in Computer Science, 2003
    Co-Authors: Dola Saha, Tetsuro Ueda, Somprakash Bandyopadhyay, Shinsuke Tanaka
    Abstract:

    Multipath routing protocols are distinguished from single-path protocol by the fact that they use several paths to distribute traffic from a source to a destination instead of a single path. Multipath routing may improve system performance through load balancing and reduced end-to-end delay. However, two major issues that dictate the performance of multipath routing – how many paths are needed and how to select these paths. In this paper, we have addressed these two issues in the context of ad hoc wireless networks and shown that the success of multipath routing depends on the effects of route coupling during path selection. Route coupling, in wireless medium, occurs when two routes are located physically close enough to interfere with each other during data communication. Here, we have used a notion of zone-disjoint routes to minimize the effect of interference among routes in wireless medium. Moreover, the use of Directional Antenna in this context helps to decouple interfering routes easily compared to omni-Directional Antenna.

  • a rotational sector based receiver oriented mechanism for location tracking and medium access control in ad hoc networks using Directional Antenna
    Lecture Notes in Computer Science, 2003
    Co-Authors: Tetsuro Ueda, Siuli Roy, Dola Saha, Shinsuke Tanaka, Somprakash Bandyopadhyay
    Abstract:

    The use of Directional Antenna in wireless ad hoc networks potentially increases simultaneous communication by directing the transmitting and receiving beams towards the receiver and transmitter node as compared to omni-Directional Antenna, where nodes in the vicinity of a communication are kept silent. However, in order to implement effective Directional MAC protocol using Directional Antenna, a node should know how to set its transmission direction to transmit a packet to its neighbors and to avoid transmission in other directions where data communications are already in progress. So, it becomes imperative to have a mechanism at each node to track the locations of its neighbors and to know the communication status of neighboring nodes. In this paper, we propose a receiver-centric approach for location tracking and MAC protocol. The performance evaluation on QualNet network simulator indicates that our protocol is highly efficient with increasing number of communications and increasing data rate.

  • A network-aware MAC and routing protocol for effective load balancing in ad hoc wireless networks with Directional Antenna
    Proceedings of the 4th ACM international symposium on Mobile ad hoc networking & computing - MobiHoc '03, 2003
    Co-Authors: Siuli Roy, Tetsuro Ueda, Dola Saha, Shinsuke Tanaka
    Abstract:

    Use of Directional Antenna in the context of ad hoc wireless networks can largely reduce radio interference, thereby improving the utilization of wireless medium. Our major contribution in this paper is to devise a routing strategy, along with a {MAC} protocol, that exploits the advantages of Directional Antenna in ad hoc networks for improved system performance. In this paper, we have illustrated a {MAC} and routing protocol for ad hoc networks using Directional Antenna with the objective of effective load balancing through the selection of maximally zone disjoint routes. Zone-disjoint routes would minimize the effect of route coupling by selecting routes in such a manner that data communication over one route will minimally interfere with data communication over the others. In our {MAC} protocol, each node keeps certain neighborhood status information dynamically in order that each node is aware of its neighborhood and communications going on in its neighborhood at that instant of time. This status information from each node is propagated periodically throughout the network. This would help each node to capture the approximate network status periodically that helps each node to become topology-aware and aware of communications going on in the network, although in an approximate manner. With this status information, each intermediate node adaptively computes routes towards destination. The performance of the proposed framework has been evaluated on {QualNet} Network Simulator with {DSR} (as in {QualNet)} as a benchmark. Our proposed mechanism shows four to five times performance improvement over {DSR}, thus demonstrating the effectiveness of this proposal.

Khaled Ben Letaief - One of the best experts on this subject based on the ideXlab platform.

  • Coverage Analysis for Millimeter Wave Networks: The Impact of Directional Antenna Arrays
    arXiv: Information Theory, 2017
    Co-Authors: Jun Zhang, Martin Haenggi, Khaled Ben Letaief
    Abstract:

    Millimeter wave (mm-wave) communications is considered a promising technology for 5G networks. Exploiting beamforming gains with large-scale Antenna arrays to combat the increased path loss at mm-wave bands is one of its defining features. However, previous works on mm-wave network analysis usually adopted oversimplified Antenna patterns for tractability, which can lead to significant deviation from the performance with actual Antenna patterns. In this paper, using tools from stochastic geometry, we carry out a comprehensive investigation on the impact of Directional Antenna arrays in mm-wave networks. We first present a general and tractable framework for coverage analysis with arbitrary distributions for interference power and arbitrary Antenna patterns. It is then applied to mm-wave ad hoc and cellular networks, where two sophisticated Antenna patterns with desirable accuracy and analytical tractability are proposed to approximate the actual Antenna pattern. Compared with previous works, the proposed approximate Antenna patterns help to obtain more insights on the role of Directional Antenna arrays in mm-wave networks. In particular, it is shown that the coverage probabilities of both types of networks increase as a non-decreasing concave function with the Antenna array size. The analytical results are verified to be effective and reliable through simulations, and numerical results also show that large-scale Antenna arrays are required for satisfactory coverage in mm-wave networks.

  • Coverage Analysis for Millimeter Wave Networks: The Impact of Directional Antenna Arrays
    IEEE Journal on Selected Areas in Communications, 2017
    Co-Authors: Jun Zhang, Martin Haenggi, Khaled Ben Letaief
    Abstract:

    Millimeter wave (mm-wave) communications is considered a promising technology for 5G networks. Exploiting beamforming gains with large-scale Antenna arrays to combat the increased path loss at mm-wave bands is one of the defining features. However, previous works on mm-wave network analysis usually adopted oversimplified Antenna patterns for tractability, which can lead to significant deviation from the performance with actual Antenna patterns. In this paper, using tools from stochastic geometry, we carry out a comprehensive investigation on the impact of Directional Antenna arrays in mm-wave networks. We first present a general and tractable framework for coverage analysis with arbitrary distributions for interference power and arbitrary Antenna patterns. It is then applied to mm-wave ad hoc and cellular networks, where two sophisticated Antenna patterns with desirable accuracy and analytical tractability are proposed to approximate the actual Antenna pattern. Compared with previous works, the proposed approximate Antenna patterns help to obtain more insights on the role of Directional Antenna arrays in mm-wave networks. In particular, it is shown that the coverage probabilities of both types of networks increase as a non-decreasing concave function with the Antenna array size. The analytical results are verified to be effective and reliable through simulations, and numerical results also show that large-scale Antenna arrays are required for satisfactory coverage in mm-wave networks.

Tetsuro Ueda - One of the best experts on this subject based on the ideXlab platform.

  • improving end to end delay through load balancing with multipath routing in ad hoc wireless networks using Directional Antenna
    Lecture Notes in Computer Science, 2003
    Co-Authors: Dola Saha, Tetsuro Ueda, Somprakash Bandyopadhyay, Shinsuke Tanaka
    Abstract:

    Multipath routing protocols are distinguished from single-path protocol by the fact that they use several paths to distribute traffic from a source to a destination instead of a single path. Multipath routing may improve system performance through load balancing and reduced end-to-end delay. However, two major issues that dictate the performance of multipath routing – how many paths are needed and how to select these paths. In this paper, we have addressed these two issues in the context of ad hoc wireless networks and shown that the success of multipath routing depends on the effects of route coupling during path selection. Route coupling, in wireless medium, occurs when two routes are located physically close enough to interfere with each other during data communication. Here, we have used a notion of zone-disjoint routes to minimize the effect of interference among routes in wireless medium. Moreover, the use of Directional Antenna in this context helps to decouple interfering routes easily compared to omni-Directional Antenna.

  • a rotational sector based receiver oriented mechanism for location tracking and medium access control in ad hoc networks using Directional Antenna
    Lecture Notes in Computer Science, 2003
    Co-Authors: Tetsuro Ueda, Siuli Roy, Dola Saha, Shinsuke Tanaka, Somprakash Bandyopadhyay
    Abstract:

    The use of Directional Antenna in wireless ad hoc networks potentially increases simultaneous communication by directing the transmitting and receiving beams towards the receiver and transmitter node as compared to omni-Directional Antenna, where nodes in the vicinity of a communication are kept silent. However, in order to implement effective Directional MAC protocol using Directional Antenna, a node should know how to set its transmission direction to transmit a packet to its neighbors and to avoid transmission in other directions where data communications are already in progress. So, it becomes imperative to have a mechanism at each node to track the locations of its neighbors and to know the communication status of neighboring nodes. In this paper, we propose a receiver-centric approach for location tracking and MAC protocol. The performance evaluation on QualNet network simulator indicates that our protocol is highly efficient with increasing number of communications and increasing data rate.

  • A network-aware MAC and routing protocol for effective load balancing in ad hoc wireless networks with Directional Antenna
    Proceedings of the 4th ACM international symposium on Mobile ad hoc networking & computing - MobiHoc '03, 2003
    Co-Authors: Siuli Roy, Tetsuro Ueda, Dola Saha, Shinsuke Tanaka
    Abstract:

    Use of Directional Antenna in the context of ad hoc wireless networks can largely reduce radio interference, thereby improving the utilization of wireless medium. Our major contribution in this paper is to devise a routing strategy, along with a {MAC} protocol, that exploits the advantages of Directional Antenna in ad hoc networks for improved system performance. In this paper, we have illustrated a {MAC} and routing protocol for ad hoc networks using Directional Antenna with the objective of effective load balancing through the selection of maximally zone disjoint routes. Zone-disjoint routes would minimize the effect of route coupling by selecting routes in such a manner that data communication over one route will minimally interfere with data communication over the others. In our {MAC} protocol, each node keeps certain neighborhood status information dynamically in order that each node is aware of its neighborhood and communications going on in its neighborhood at that instant of time. This status information from each node is propagated periodically throughout the network. This would help each node to capture the approximate network status periodically that helps each node to become topology-aware and aware of communications going on in the network, although in an approximate manner. With this status information, each intermediate node adaptively computes routes towards destination. The performance of the proposed framework has been evaluated on {QualNet} Network Simulator with {DSR} (as in {QualNet)} as a benchmark. Our proposed mechanism shows four to five times performance improvement over {DSR}, thus demonstrating the effectiveness of this proposal.

Somprakash Bandyopadhyay - One of the best experts on this subject based on the ideXlab platform.

  • improving end to end delay through load balancing with multipath routing in ad hoc wireless networks using Directional Antenna
    Lecture Notes in Computer Science, 2003
    Co-Authors: Dola Saha, Tetsuro Ueda, Somprakash Bandyopadhyay, Shinsuke Tanaka
    Abstract:

    Multipath routing protocols are distinguished from single-path protocol by the fact that they use several paths to distribute traffic from a source to a destination instead of a single path. Multipath routing may improve system performance through load balancing and reduced end-to-end delay. However, two major issues that dictate the performance of multipath routing – how many paths are needed and how to select these paths. In this paper, we have addressed these two issues in the context of ad hoc wireless networks and shown that the success of multipath routing depends on the effects of route coupling during path selection. Route coupling, in wireless medium, occurs when two routes are located physically close enough to interfere with each other during data communication. Here, we have used a notion of zone-disjoint routes to minimize the effect of interference among routes in wireless medium. Moreover, the use of Directional Antenna in this context helps to decouple interfering routes easily compared to omni-Directional Antenna.

  • a rotational sector based receiver oriented mechanism for location tracking and medium access control in ad hoc networks using Directional Antenna
    Lecture Notes in Computer Science, 2003
    Co-Authors: Tetsuro Ueda, Siuli Roy, Dola Saha, Shinsuke Tanaka, Somprakash Bandyopadhyay
    Abstract:

    The use of Directional Antenna in wireless ad hoc networks potentially increases simultaneous communication by directing the transmitting and receiving beams towards the receiver and transmitter node as compared to omni-Directional Antenna, where nodes in the vicinity of a communication are kept silent. However, in order to implement effective Directional MAC protocol using Directional Antenna, a node should know how to set its transmission direction to transmit a packet to its neighbors and to avoid transmission in other directions where data communications are already in progress. So, it becomes imperative to have a mechanism at each node to track the locations of its neighbors and to know the communication status of neighboring nodes. In this paper, we propose a receiver-centric approach for location tracking and MAC protocol. The performance evaluation on QualNet network simulator indicates that our protocol is highly efficient with increasing number of communications and increasing data rate.

Dola Saha - One of the best experts on this subject based on the ideXlab platform.

  • improving end to end delay through load balancing with multipath routing in ad hoc wireless networks using Directional Antenna
    Lecture Notes in Computer Science, 2003
    Co-Authors: Dola Saha, Tetsuro Ueda, Somprakash Bandyopadhyay, Shinsuke Tanaka
    Abstract:

    Multipath routing protocols are distinguished from single-path protocol by the fact that they use several paths to distribute traffic from a source to a destination instead of a single path. Multipath routing may improve system performance through load balancing and reduced end-to-end delay. However, two major issues that dictate the performance of multipath routing – how many paths are needed and how to select these paths. In this paper, we have addressed these two issues in the context of ad hoc wireless networks and shown that the success of multipath routing depends on the effects of route coupling during path selection. Route coupling, in wireless medium, occurs when two routes are located physically close enough to interfere with each other during data communication. Here, we have used a notion of zone-disjoint routes to minimize the effect of interference among routes in wireless medium. Moreover, the use of Directional Antenna in this context helps to decouple interfering routes easily compared to omni-Directional Antenna.

  • a rotational sector based receiver oriented mechanism for location tracking and medium access control in ad hoc networks using Directional Antenna
    Lecture Notes in Computer Science, 2003
    Co-Authors: Tetsuro Ueda, Siuli Roy, Dola Saha, Shinsuke Tanaka, Somprakash Bandyopadhyay
    Abstract:

    The use of Directional Antenna in wireless ad hoc networks potentially increases simultaneous communication by directing the transmitting and receiving beams towards the receiver and transmitter node as compared to omni-Directional Antenna, where nodes in the vicinity of a communication are kept silent. However, in order to implement effective Directional MAC protocol using Directional Antenna, a node should know how to set its transmission direction to transmit a packet to its neighbors and to avoid transmission in other directions where data communications are already in progress. So, it becomes imperative to have a mechanism at each node to track the locations of its neighbors and to know the communication status of neighboring nodes. In this paper, we propose a receiver-centric approach for location tracking and MAC protocol. The performance evaluation on QualNet network simulator indicates that our protocol is highly efficient with increasing number of communications and increasing data rate.

  • A network-aware MAC and routing protocol for effective load balancing in ad hoc wireless networks with Directional Antenna
    Proceedings of the 4th ACM international symposium on Mobile ad hoc networking & computing - MobiHoc '03, 2003
    Co-Authors: Siuli Roy, Tetsuro Ueda, Dola Saha, Shinsuke Tanaka
    Abstract:

    Use of Directional Antenna in the context of ad hoc wireless networks can largely reduce radio interference, thereby improving the utilization of wireless medium. Our major contribution in this paper is to devise a routing strategy, along with a {MAC} protocol, that exploits the advantages of Directional Antenna in ad hoc networks for improved system performance. In this paper, we have illustrated a {MAC} and routing protocol for ad hoc networks using Directional Antenna with the objective of effective load balancing through the selection of maximally zone disjoint routes. Zone-disjoint routes would minimize the effect of route coupling by selecting routes in such a manner that data communication over one route will minimally interfere with data communication over the others. In our {MAC} protocol, each node keeps certain neighborhood status information dynamically in order that each node is aware of its neighborhood and communications going on in its neighborhood at that instant of time. This status information from each node is propagated periodically throughout the network. This would help each node to capture the approximate network status periodically that helps each node to become topology-aware and aware of communications going on in the network, although in an approximate manner. With this status information, each intermediate node adaptively computes routes towards destination. The performance of the proposed framework has been evaluated on {QualNet} Network Simulator with {DSR} (as in {QualNet)} as a benchmark. Our proposed mechanism shows four to five times performance improvement over {DSR}, thus demonstrating the effectiveness of this proposal.