The Experts below are selected from a list of 491304 Experts worldwide ranked by ideXlab platform

Xinbo Wang - One of the best experts on this subject based on the ideXlab platform.

  • dynamic optical resource allocation for mobile core networks with software defined elastic optical networking
    Optics Express, 2016
    Co-Authors: Yongli Zhao, Zhendong Chen, Jie Zhang, Xinbo Wang
    Abstract:

    Driven by the forthcoming of 5G mobile communications, the all-IP architecture of mobile core networks, i.e. evolved packet core (EPC) proposed by 3GPP, has been greatly challenged by the users’ demands for Higher Data Rate and more reliable end-to-end connection, as well as operators’ demands for low operational cost. These challenges can be potentially met by software defined optical networking (SDON), which enables dynamic resource allocation according to the users’ requirement. In this article, a novel network architecture for mobile core network is proposed based on SDON. A software defined network (SDN) controller is designed to realize the coordinated control over different entities in EPC networks. We analyze the requirement of EPC-lightpath (EPCL) in Data plane and propose an optical switch load balancing (OSLB) algorithm for resource allocation in optical layer. The procedure of establishment and adjustment of EPCLs is demonstRated on a SDON-based EPC testbed with extended OpenFlow protocol. We also evaluate the OSLB algorithm through simulation in terms of bandwidth blocking ratio, traffic load distribution, and resource utilization ratio compared with link-based load balancing (LLB) and MinHops algorithms.

  • Baseband unit cloud interconnection enabled by flexible grid optical networks with software defined elasticity
    IEEE Communications Magazine, 2015
    Co-Authors: Jiawei Zhang, Yongli Zhao, Jie Zhang, Siming Liu, Mei Song, Xinbo Wang
    Abstract:

    The evolution toward 5G mobile networks is characterized by supporting Higher Data Rate, excellent end-to-end performance and ubiquitous user-coverage with lower latency, power consumption, and cost. To support this, the RANs are evolving in two important aspects. One aspect is “cloudification,” which is to pool baseband units to be centralized for statistical multiplexing gain. The other aspect is to use advanced optical technologies for digital and analog signal transmission in a cloud-based RAN. In this article, we focus on BBU cloud interconnection with optical layer technologies. Flexible grid optical networks with the enabling technologies are introduced to provide elastic, transparent, and virtualized optical paths between the BBU pools. To improve the elasticity and intelligence of C-RAN, we propose a software defined centralized control plane to coordinate heterogeneous resources from three domains: the BBU domain, radio domain, and optical domain. We report an experimental demonstration of elastic lightpath provision for cloud radio-over-flexible grid optical networks in a software-defined-networking-based testbed.

Ji-woong Choi - One of the best experts on this subject based on the ideXlab platform.

  • Near-field magnetic induction MIMO communication using heterogeneous multipole loop antenna array for Higher Data Rate transmission
    IEEE Transactions on Antennas and Propagation, 2016
    Co-Authors: Han Joon Kim, Jihwan P. Choi, Kyoung-sub Oh, Jae Eun Jang, Jinho Park, Ji-woong Choi
    Abstract:

    In this paper, we propose a novel method realizing multi-input–multi-output (MIMO) transmission in near-field magnetic induction (NFMI) communication for increasing chan- nel capacity where limited capacity is amajor bottleneck problem in magnetic communication systems. Since conventional magnetic communication systems using the same antenna patterns can- not easily implementMIMO transmission due to strong crosstalk between transmitters, we propose heterogeneous antenna arrays with multipole antennas, enabling crosstalk cancellation.We con- firm the crosstalk cancellation of the proposed antenna array through numerical simulations and experiments, and verify the capacity enhancement of the proposed NFMI communication system over conventional NFMI communication schemes.

Yongli Zhao - One of the best experts on this subject based on the ideXlab platform.

  • dynamic optical resource allocation for mobile core networks with software defined elastic optical networking
    Optics Express, 2016
    Co-Authors: Yongli Zhao, Zhendong Chen, Jie Zhang, Xinbo Wang
    Abstract:

    Driven by the forthcoming of 5G mobile communications, the all-IP architecture of mobile core networks, i.e. evolved packet core (EPC) proposed by 3GPP, has been greatly challenged by the users’ demands for Higher Data Rate and more reliable end-to-end connection, as well as operators’ demands for low operational cost. These challenges can be potentially met by software defined optical networking (SDON), which enables dynamic resource allocation according to the users’ requirement. In this article, a novel network architecture for mobile core network is proposed based on SDON. A software defined network (SDN) controller is designed to realize the coordinated control over different entities in EPC networks. We analyze the requirement of EPC-lightpath (EPCL) in Data plane and propose an optical switch load balancing (OSLB) algorithm for resource allocation in optical layer. The procedure of establishment and adjustment of EPCLs is demonstRated on a SDON-based EPC testbed with extended OpenFlow protocol. We also evaluate the OSLB algorithm through simulation in terms of bandwidth blocking ratio, traffic load distribution, and resource utilization ratio compared with link-based load balancing (LLB) and MinHops algorithms.

  • Baseband unit cloud interconnection enabled by flexible grid optical networks with software defined elasticity
    IEEE Communications Magazine, 2015
    Co-Authors: Jiawei Zhang, Yongli Zhao, Jie Zhang, Siming Liu, Mei Song, Xinbo Wang
    Abstract:

    The evolution toward 5G mobile networks is characterized by supporting Higher Data Rate, excellent end-to-end performance and ubiquitous user-coverage with lower latency, power consumption, and cost. To support this, the RANs are evolving in two important aspects. One aspect is “cloudification,” which is to pool baseband units to be centralized for statistical multiplexing gain. The other aspect is to use advanced optical technologies for digital and analog signal transmission in a cloud-based RAN. In this article, we focus on BBU cloud interconnection with optical layer technologies. Flexible grid optical networks with the enabling technologies are introduced to provide elastic, transparent, and virtualized optical paths between the BBU pools. To improve the elasticity and intelligence of C-RAN, we propose a software defined centralized control plane to coordinate heterogeneous resources from three domains: the BBU domain, radio domain, and optical domain. We report an experimental demonstration of elastic lightpath provision for cloud radio-over-flexible grid optical networks in a software-defined-networking-based testbed.

Remun Koirala - One of the best experts on this subject based on the ideXlab platform.

  • localization and throughput trade off in a multi user multi carrier mm wave system
    IEEE Access, 2019
    Co-Authors: Benoit Denis, Remun Koirala, Bernard Uguen, Davide Dardari, Henk Wymeersch
    Abstract:

    In this paper, we propose various localization error optimal beamforming stRategies and subsequently study the trade-off between Data and localization services while budgeting time and frequency resources in a multi-user millimeter-wave framework. Allocating more resources for the Data service phase instead of localization would imply Higher Data Rate but, concurrently, also a Higher position and orientation estimation error. In order to characterize this trade-off, we firstly derive a flexible application-dependent localization error cost function combining the Cramer-Rao lower bounds of delay, angle of departure and/or angle of arrival estimates at a mobile receiver over the downlink. Consequently we devise different fairness criteria based localization error optimal beamforming stRategies in a multi-user context. Finally, we show the advantage of the latter beamforming stRategies and assess the communication-localization trade-off with respect to various time-frequency resource division schemes.

Jie Zhang - One of the best experts on this subject based on the ideXlab platform.

  • dynamic optical resource allocation for mobile core networks with software defined elastic optical networking
    Optics Express, 2016
    Co-Authors: Yongli Zhao, Zhendong Chen, Jie Zhang, Xinbo Wang
    Abstract:

    Driven by the forthcoming of 5G mobile communications, the all-IP architecture of mobile core networks, i.e. evolved packet core (EPC) proposed by 3GPP, has been greatly challenged by the users’ demands for Higher Data Rate and more reliable end-to-end connection, as well as operators’ demands for low operational cost. These challenges can be potentially met by software defined optical networking (SDON), which enables dynamic resource allocation according to the users’ requirement. In this article, a novel network architecture for mobile core network is proposed based on SDON. A software defined network (SDN) controller is designed to realize the coordinated control over different entities in EPC networks. We analyze the requirement of EPC-lightpath (EPCL) in Data plane and propose an optical switch load balancing (OSLB) algorithm for resource allocation in optical layer. The procedure of establishment and adjustment of EPCLs is demonstRated on a SDON-based EPC testbed with extended OpenFlow protocol. We also evaluate the OSLB algorithm through simulation in terms of bandwidth blocking ratio, traffic load distribution, and resource utilization ratio compared with link-based load balancing (LLB) and MinHops algorithms.

  • Baseband unit cloud interconnection enabled by flexible grid optical networks with software defined elasticity
    IEEE Communications Magazine, 2015
    Co-Authors: Jiawei Zhang, Yongli Zhao, Jie Zhang, Siming Liu, Mei Song, Xinbo Wang
    Abstract:

    The evolution toward 5G mobile networks is characterized by supporting Higher Data Rate, excellent end-to-end performance and ubiquitous user-coverage with lower latency, power consumption, and cost. To support this, the RANs are evolving in two important aspects. One aspect is “cloudification,” which is to pool baseband units to be centralized for statistical multiplexing gain. The other aspect is to use advanced optical technologies for digital and analog signal transmission in a cloud-based RAN. In this article, we focus on BBU cloud interconnection with optical layer technologies. Flexible grid optical networks with the enabling technologies are introduced to provide elastic, transparent, and virtualized optical paths between the BBU pools. To improve the elasticity and intelligence of C-RAN, we propose a software defined centralized control plane to coordinate heterogeneous resources from three domains: the BBU domain, radio domain, and optical domain. We report an experimental demonstration of elastic lightpath provision for cloud radio-over-flexible grid optical networks in a software-defined-networking-based testbed.