Abstract:
PURPOSE: A common radio resource management apparatus for handover between heterogeneous networks, a local radio resource management apparatus for handover between heterogeneous networks, and a handover method by managing common radio resource management over a heterogeneous network environment are provided to efficiently supply the services of various service qualities to a mobile terminal by supporting the handover between heterogeneous networks through integrated wireless resource management. CONSTITUTION: A network state information management unit(110) receives network state information non-dependent on a network from heterogeneous networks. A mobile terminal information management unit(120) receives mobile terminal information non-dependent on the network from each network of heterogeneous networks. Based on the state information of the nondependent network and the information of the non-dependent mobile terminal, a network selection unit(130) selects the network for handover.
Abstract:
본 발명은 분산화를 통한 시스템 가용성 증가 및 트래픽 변화에 대해 유연한 대처를 할 수 있도록 하는 다중 패킷 관문 교환장치(Gateway GPRS Supporting Node: GGSN)를 갖는 범용 패킷 무선 서비스(General Packet Radio Service: GPRS) 시스템 및 GGSN 선택 방법에 관한 것이다. 본 발명에 따른 다중 GGSN을 이용한 GPRS 시스템은, 패킷-기반 무선 서비스를 제공받기 위한 무선 단말의 세션 요청에 대한 연결 동작을 제어하고, 연결된 세션에 따라 패킷 전송을 처리하는 패킷 중계 노드(SGSN); SGSN에 의하여 무선 단말의 세션 요청에 따라 선택되고, 패킷 송수신을 위해 상기 GPRS 시스템 망과 외부망 사이의 게이트웨이 동작을 수행하는 다수의 서브 GGSN를 구비하는 다중 GGSN부; SGSN의 선택에 따른 다중 GGSN부의 다수의 서브 GGSN에 대해 자신의 이름 및 IP 정보를 저장 및 관리하는 도메인 네임 시스템(DNS); 다중 GGSN부와 외부망 사이에 연결되어 DNS와 통신을 관리하는 운용자망; 및 GPRS 시스템의 최종 종단점에 위치하여 외부망 사이의 패킷 라우팅 동작을 수행하는 경계 라우터를 포함한다. 본 발명에 따르면, 고장에 강하고 변동 트래픽에 대해 유연성을 갖도록 함으로써 GPRS 시스템의 효율을 증대시킬 수 있다. GPRS, SGSN, GGSN, DNS, 다중 GGSN, 경계 라우터
Abstract:
Disclosed is a protocol embodying system and method in the GGSN. An IP layer is provided between the GPRS network and the PDN and performs routing between the two networks, and performs routing between the protocols of the first and second network layers and the transfer layer protocol on the GPRS network. A virtual driver is provided on the lower part of the IP layer, is connected to the protocol of the GPRS tunneling provided to the upper part of the IP layer on the GPRS network, and is operable as the lower interface of the IP layer. Since the upper part and the lower part of the IP are appropriately connected by the virtual driver, a single IP is needed in the system, and the embodied configuration becomes simpler.
Abstract:
PURPOSE: A protocol implementation system in GGSN(Gateway GPRS Supporting Node) and a method thereof are provided to simplify an implementation structure by installing a virtual driver below an IP layer. CONSTITUTION: A protocol implementation system in GGSN includes an IP layer and a virtual driver(100). The IP layer is located between a GPRS(General Packet Radio Service) network and a public data network in order to perform a routing operation therebetween. In addition, the IP layer is used for performing a routing operation between protocols of a first and a second network layer and a protocol of a transmission layer in the GPRS network. The virtual driver is located below the IP layer in order to be connected to a protocol of GPRS tunneling. The virtual driver is operated as a sub-interface of the IP layer.
Abstract:
Provided are a method and a system which can control the charging of an electric vehicle at home using home network equipment (a home pad, a wall pad, a personal computer, etc.). A user of the electric vehicle can conveniently control the charging of the electric vehicle indoors. Additionally, the present invention is economical because the user can use existing home network equipment, indoor UI, and an electric vehicle charging system in the same way as before.
Abstract:
Disclosed are a device and a method for predicting the energy consumption of a building. The device for predicting energy consumption of a building selects parameters having a high correlation with energy consumption of a building among multiple parameters and predicts the energy consumption of the building by using the selected parameters. Furthermore, the device for predicting energy consumption of a building compares a prediction value and a measurement value of the energy consumption and determines how accurate the prediction value is and whether the parameters are appropriately selected.
Abstract:
PURPOSE: A power management terminal and a power management apparatus are provided to easily check power consumption state of power use apparatuses and to effectively manage the power consumption state. CONSTITUTION: Smart plugs(10a-10n) are installed within building and supply power to a power use apparatus. The smart plugs read power use amount of the power use apparatus and outputs power use information with unique location information. A gateway(20) collects the power use information from the smart plugs and transmits it to a power management terminal of a subscriber. The gateway transmits the power use information collected by an upload request of the power management terminal to an energy management server through a communications network. The gateway transmits analysis energy information to the power management terminal. An energy management server(50) analyzes energy consumption type of the subscriber based on the power use information. The energy management server outputs the analysis energy information including an energy consumption pattern in response to an analysis energy information request of the power management terminal.