摘要:
A method and an apparatus for acquiring initial synchronization in a wireless communication system are provided. A relay station determines whether or not the initial synchronization is acquired, determines a start position of a frame using a peak of an autocorrelation signal detected based on a preamble and a relay-amble (R-amble) received from a base station in the case in which the initial synchronization is not acquired, and determines the start position of the frame using a peak of an autocorrelation signal detected based on the relay-amble received from the base station in the case in which the initial synchronization is acquired.
摘要:
A method for wireless positioning is provided. The method for wireless positioning includes: acquiring synchronization with base stations; collecting a plurality of propagation delay taps for the base stations; determining a final propagation delay tap among the plurality of propagation delay taps; calculating a time difference of arrival (TDOA) value using the final propagation delay value; and deriving locations of the terminals using the calculated TDOA value. By this configuration, the positioning accuracy can be improved.
摘要:
A method and apparatus for an adaptive Hypertext Transfer Protocol (HTTP) streaming service using metadata of content are provided. The metadata may include one or more BaseURL elements. Uniform Resource Locators (URLs) of segments forming media may be generated based on the BaseURL elements. Additionally, a URL of a segment may be generated by mapping a BaseURL element among the BaseURL elements to a sourceURL attribute of the segment. Segments indicated by generated URLs may be identical to each other.
摘要:
Provided is a system and method that may perform various operations on a website according to combinations of buttons on a remote controller. A system for supporting a remote controller may include: a profile storage unit to store a plurality of profiles containing functions of the remote controller and information associated with the functions of the remote controller; a receiver to receive an input signal from the remote controller, and to interpret an event of the input signal based on a profile corresponding to the remote controller; and a presentation unit to access a web server, to transform, to a predetermined behavior, at least one event interpreted by the receiver, and to request the web server for an operation corresponding to the behavior.
摘要:
An Open Internet Protocol Television (IPTV) platform is provided. By providing remote medical services to users in the Open IPTV environment using a remote medical service providing apparatus including: an application programming interface (API) calling unit to call, when receiving a request for receiving a remote medical service from a counselor's terminal, an API of an Open Internet Protocol Television (IPTV) platform; and a service provider to provide the remote medical service to a user through the API, it is possible to provide remote medical service operators with environments where they can develop and share various remote medical to services and content.
摘要:
Provided is a remote controller supporting system and method that may display, on objects included in a webpage, keys of a remote controller corresponding to the objects and manipulation schemes, respectively. The remote controller supporting system may include: a profile storage unit to store a plurality of profiles containing functions of the remote controller and information associated with the functions of the remote controller; a receiver to receive an input signal from the remote controller, and to interpret a meaning of the input signal based on a profile corresponding to the remote controller; an event unit to transform the meaning of the input signal to an event form; and a presentation unit to access a web server to display a webpage, to transform, to a predetermined behavior, at least one event transformed by the event unit, and to request the web server for an operation corresponding to the behavior.
摘要:
A method for supporting handoff and preventing data loss in mobile communications networks is provided. The method for a mobile node establishing a mobile Internet protocol (MIP) with at least one or more wireless packet service systems, each of which has a serving GPRS support node (SGSN) and a gateway GPRS support node (GGSN), includes: a first SGSN connected to the mobile node transmitting predetermined first connection information on the mobile node to at least one or more second SGSNs adjacent to the first SGSN; the second SGSN receiving the first connection information storing the first connection information as a database item, and transmitting 1 first connection acknowledgement message to the first SGSN; if reception of the connection acknowledgement message is successful, the first GGSN connected to the first SGSN transmitting predetermined second connection information on the mobile node to at least one or more second GGSNs connected to the second SGSN; and the second GGSN receiving the second connection information and then transmitting a second connection acknowledgement message to the second GGSN. By transmitting information on a mobile node required for handoff to adjacent foreign agents (FAs) in advance, when handoff is performed, reliable handoff can be performed quickly without resetting and releasing a PPP, such that IP mobility services can be provided.
摘要:
The present invention provides a method and system for providing a SIP based Instance Messaging (IM), and an IM proxy server therefor. An IM proxy server for performing a proxy function in a mobile communication network is configured to provide an IM service between a mobile terminal lacking an SIP function and an IM server. Further, the IM proxy server converts an IM message received from the mobile terminal into a corresponding SIP message mapped thereto, transmits the SIP message to the IM server through a call session control server, converts an SIP message received from the IM server through the call session control server into an IM message recognizable by the mobile terminal, and transmits the IM message to the mobile terminal, thus providing the SIP based IM service to the mobile terminal lacking an SIP function.
摘要:
Provided is a method for communication between access points (APs) and for a user agent (UA)'s selecting an AP and establishing a connection by which in establishing a connection between a wireless LAN AP providing a wireless LAN service and the UA in a public wireless LAN service utilizing a wireless LAN technology, a maximum efficiency of the AP a maximum performance of the UA can be obtained. According to the method, the number of user agents connected to a current AP and the amount of traffic being currently processed are compared with the maximum capacity of a neighboring AP and the number of user agents connected to and being serviced by the neighboring AP, to recommend an optimum AP to the user agent. By doing so, the user agent is allowed to comprehensively review information on the number of user agents connected to an adjacent AP and the amount of traffic being processed by the AP as well as reception sensitivity, and then to select an optimum AP.
摘要:
An arbitration switching system and a method of arbitration switching in a high-speed packet switching system uses a subscriber input/output device, an arbitration switching system and a parallel common bus part for the purpose of point-to-point communication point-to-multipoint communication and transferring packets generated in each node. A system bus structure is based on a parallel common bus type. Furthermore, to accommodate high-speed arbitration switching, operations such as polling, arbitration and switching are processed in parallel. Therefore, bus use efficiency is high, and a bus-extension can be easily achieved. A star LAN may be realized because broadcasting and multicasting are supported. An internal high-speed network for interlock in large-scaled communication systems that need high-speed switching can also be provided.