Abstract: An apparatus for canceling an acoustic echo signal caused by a far-end talker signal is provided. The apparatus for canceling an acoustic echo signal includes: a variance estimating unit configured to estimate a variance of a first audio signal of a near-end talker signal and a first noise signal of the near-end talker signal; a step size determining unit configured to determine a step size by using the variance of the first audio signal and the variance of the first noise signal; an adaptive filter coefficient updating unit configured to update an adaptive filter coefficient of an adaptive filter by using the step size; and an acoustic echo canceling unit configured to estimate an acoustic echo signal by using the adaptive filter coefficient, and cancel the acoustic echo signal from a microphone input signal by using the estimated acoustic echo signal.

Abstract: A method of controlling routing of an identifier/locator mapping service that can secure security regarding location information without a scalability problem and that can support mobility is provided. By generating a domain group by forming a plurality of domains in a group, a scalability problem of an ID/LOC mapping table for ID of a flat structure can be solved. An identifier of a communication object existing at each domain is managed using a counting bloom filter, and thus a message overhead of a mapping service can be reduced. Further, by enabling ID/LOC mapping table information to remain within a domain, location information of a communication object can be protected.

Abstract: A method of a node forwarding a packet in an identifier/locator separation environment is provided. The packet forwarding method includes providing a routing table for storing information on domains, searching the routing table using an identifier (ID) of a domain to which a destination node belongs to obtain first information that is information on a next hop, storing the first information in a forwarding table together with an ID of the destination node, searching the forwarding table using the destination node ID to obtain second information that is information on a next hop, and forwarding the packet using the second information.

Abstract: In an ID-based communication system, a routing apparatus creates a hierarchical network topology by using link state information on higher-level domains, lower-level domains, and peer domains. The routing apparatus then makes a routing table based on the hierarchical network topology, and performs routing by using the routing table.

Abstract: Provided is an apparatus and method for controlling a network using identification information of an object. The network controlling apparatus may include an extractor to extract identification information of a receiving object from received data, and a controller to verify, from a database, forwarding information that is stored in correspondence to the identification information, and to transfer the data to a gateway associated with a second domain designated by the forwarding information, when the receiving object is not included in a first domain.

Abstract: An apparatus for canceling an acoustic echo signal caused by a far-end talker signal is provided. The apparatus for canceling an acoustic echo signal includes: a variance estimating unit configured to estimate a variance of a first audio signal of a near-end talker signal and a first noise signal of the near-end talker signal; a step size determining unit configured to determine a step size by using the variance of the first audio signal and the variance of the first noise signal; an adaptive filter coefficient updating unit configured to update an adaptive filter coefficient of an adaptive filter by using the step size; and an acoustic echo canceling unit configured to estimate an acoustic echo signal by using the adaptive filter coefficient, and cancel the acoustic echo signal from a microphone input signal by using the estimated acoustic echo signal.

Abstract: Provided is an apparatus and method for controlling a network using identification information of an object. The network controlling apparatus may include an extractor to extract identification information of a receiving object from received data, and a controller to verify, from a database, forwarding information that is stored in correspondence to the identification information, and to transfer the data to a gateway associated with a second domain designated by the forwarding information, when the receiving object is not included in a first domain.

Abstract: A peer-to-peer (P2P) streaming apparatus includes a P2P logic unit positioned at a demarcation point between a private network and a public network and performing P2P communication for sharing a multimedia stream with another user; and a delivery unit delivering the multimedia stream to an internal user terminal within the private network.