Accepted Papers

  • The Design of Policy-driven Intelligent Controller for Software-Defined Cloud Networking
    Ji-Young Kwak, SaeHoon Kang, YongYoon Shin, Younghwa Kim and Sunhee Yang,Electronics and Telecommunications Research Institute,Korea
    ABSTRACT
    The QoS requirements of various services have created a big challenge in the virtualization environments for cloud networking that cannot support the fine-grained network QoS management. As an emerging technology for satisfying these requirements, the Software Defined Networking (SDN) has the potential to enable dynamic configuration and control for the enhanced network management. This paper presents the design of an intelligent controller based on network policy in the environments of virtual networks that hide the details of an underlying physical topology. The proposed controller performs the mechanism for policy-based intelligent control to provide differentiated virtual network services based on the content of an OpenFlow packet header and mapping relationships between physical infrastructure and virtual overlay network. With this approach, the intelligent controller enables the deployment of various services on multiple virtual networks as well as the flexible management for achieving a better QoS. Furthermore, it can distribute the traffics with different QoS requirements on available paths under the constraints of available resources by adopting the structure for enforcing the QoS policy of flows.
  • Proximity Detection Method Based On Userís Orientation
    Dae-Yeob Kim1, Soo-Hyung Kim2 and Seung-Hun Jin2,1Information Security, University of Science and Technology, Daejeon, Republic of Korea and 2Authentication Research Team, Electronics and Telecommunications Research Institute, Daejeon, Republic of Korea
    ABSTRACT
    The userís proximity information based on the signal strength of wireless communication is utilized as userís context-information in an indoor and outdoor space. Many researchers have attempted to leverage this context-information to solve various problems in real world. However, since the wireless communication is easily affected by surroundings, the proximity information is relatively inaccurate. Moreover, it is not clear to analyze the user's intention by only utilizing the proximity information. The majority of existing context-aware system based on userís proximity only rely on one factor: where the user is close to. In this paper, in addition to the information indicating where the user is close to, we propose another factor: where user is heading to. Our proposed method does not require an additional module. In addition, it is possible to analyze userís intention more clearly and this improve the error detection and accuracy at the same time.
  • A New Algorithm for Construction of a P2P Multicast Hybrid Overlay Tree Based on Topological Distances
    Sergej Alekseev and Jörg Schäfer,Frankfurt University of Applied Sciences,Germany
    ABSTRACT
    In the last decade Peer to Peer technology has been thoroughly explored, because it overcomes many limitations compared to the traditional client server paradigm. Despite its advantages over a traditional approach, the ubiquitous availability of high speed, high bandwidth and low latency networks has supported the traditional client-server paradigm. Recently, however, the surge of streaming services has spawned renewed interest in Peer to Peer technologies. In addition, services like geolocation databases and browser technologies like Web- RTC make a hybrid approach attractive. In this paper we present algorithms for the construction and the maintenance of a hybrid P2P overlay multicast tree based on topological distances. The essential idea of these algorithms is to build a multicast tree by choosing neighbours close to each other. The topological distances can be easily obtained by the browser using the geolocation API. Thus the implementation of algorithms can be done web-based in a distributed manner. We present proofs of our algorithms as well as practical results and evaluations
  • A High-Efficiency Multi-Antenna LINC Transmitter for OFDM Systems
    Rui Dinis(1,2), Paulo Montezuma(1,2,3), Pedro Bento(2,4), Marco Gomes(2,4), Vitor Silva(2,4),1 DEE, FCT Universidade Nova de Lisboa, Portugal ,2 Instituto de Telecomunicacł ėoes (IT), Av. Rovisco Pais, Lisboa, Portugal ,3 Uninova, Instituto de Desenvolvimento de Novas Tecnologias, Quinta da Torre, Caparica, Portugal ,4 Department of Electrical and Computer Engineering, University of Coimbra, Coimbra, Portugal
    ABSTRACT
    LINC transmitters (LInear amplification with Nonlinear Components are suitable for the power amplification of variable-envelope signals, since they allow the use of low-cost, highly-efficient strongly-nonlinear power amplifiers. However, the combination of the outputs of the LINCís two amplifiers has is the weak part of it: the combiner losses offset the amplification efficiency gains inherent to the use of highly-efficient power amplifiers and/or it might have linearity requirements. In this paper we propose a LINC transmitter structure for OFDM systems (Orthogonal Frequency Division Multiplexing) that does not require a combiner, since the output of each amplifier is sent to a different antenna, with the channels being combined at the channel level. Therefore, our transmitter outperforms conventional LINC transmitters. Moreover, the proposed multi-antenna LINC (MA-LINC) is robust to estimation impairments.