摘要:
A method of transmitting data more effectively, and more particularly, a method of transmitting data to a group comprising a plurality of reception stations that receive the same data from a transmission station when the stations communicate the data in a power line communication (PLC) network, and an apparatus to do the same. According to the method, a transmission station transmits data to a group including a plurality of reception stations that receive the same data at a time, to prevent a channel bandwidth from being wasted, and to prevent a station that does not desire to receive the data from receiving the data.
摘要:
Provided are a channel time allocation method and apparatus adopting the same. The channel time allocation method includes: (a) receiving a request of registering in a network from a device; (b) determining whether the network supplying a service required by the device exists; and (c) if the network supplying the requested service exists, performing a procedure of registering in the network, and if the network supplying the requested service does not exist, generating a new network. Since existing MAC protocols can be used in the channel time allocation method, an optimum service is provided in a network environment in which different kinds of services coexist.
摘要:
A method of negotiating channel sharing between adjacent cells when there are a plurality of cells in a power line communication (PLC) network. The method includes attempting to negotiate the channel sharing during a minimum contention access period (CAP) which starts after a maximum beacon period ends and ends before a CAP of each PLC cell ends, wherein the maximum beacon period indicates a maximum size that a beacon frame in a super-frame transmitted from a coordinator of each PLC cell can have. When an attempt to negotiate the channel sharing is made using this method, interference does not occur during channel sharing negotiation, and effective channel sharing can be achieved, thereby eliminating interference between adjacent cells.
摘要:
A synchronization method and apparatus and a location awareness method and apparatus in a chaotic communication system are provided. The location awareness method includes receiving a data frame which includes a template chaotic signal to be determined to be arranged at a predetermined position of the data frame, and a data source signal obtained by modulating the template chaotic signal, the position allocated to a user; detecting a position of the data frame in which the template chaotic signal is substantially arranged; and determining the distance between a device transmitting the data frame and a device receiving the data frame using the difference between the position of the data frame in which the template chaotic signal is substantially arranged and the predetermined position. Accordingly, it is possible to precisely detect the distance between devices.
摘要:
A method for a first device which is a member of a parent piconet and a child PNC of its child piconet to communicate with a second device existing in either the parent piconet or the child piconet, including the steps of generating a command frame to request a channel time for communication with the second device by use of an identifier to identify the piconet and the device ID uniquely allotted to a device and transmitting the generated command frame to a parent PNC, receiving the channel time allotted from the parent PNC to which the command frame has been transmitted, during which the first device and the second device are allowed for communication, and allowing data to be transmitted and received between the first device and the second device during the allotted channel time. Correct communication can be made between two devices although they have identical device IDs.
摘要:
A method of distributing group identifiers IDs (GIDs) in a power line communication (PLC) network, a method of receiving the GIDs, an authentication apparatus, and a PLC apparatus are provided. The authentication apparatus includes: an authentication mode storing unit which stores an authentication mode having a value including one of an authentication authorized mode and an authentication unauthorized mode; a GID request receiver which receives a GID request message from a PLC apparatus; and a GID transmitter which, if the authentication mode is the authentication authorized mode, transmits a GID corresponding to the PLC apparatus to the PLC apparatus. Authentication is realized in a PLC media access control layer distributing the GIDs between a PLC apparatus and an authentication apparatus, so manually inputting a GID into the PLC apparatus is not necessary. Further, the GIDs are distributed via the authentication apparatus, thereby centrally managing the GIDs.
摘要:
A network relay apparatus and method are provided. The network relay includes a sub-network interface for communication with a sub-network, a plurality of backbone network interfaces for communication with a plurality of backbone networks, and a control unit for outputting data, which is received from a device included in the sub-network through the sub-network interface, through one of the backbone network interfaces. In the network relay, it is possible to fulfill various requests for communication quality by connecting the sub-network with the plurality of backbone networks.
摘要:
A data transmission method and apparatus and a data receiving method and apparatus provide for multiple access in a chaotic communication system. The data transmission method includes arranging a template chaotic signal at a predetermined position of a data frame to be transmitted, the predetermined position being allocated to a user, modulating a data source signal using the template chaotic signal and arranging the modulated data source signal in the data frame, and transmitting the data frame.
摘要:
An apparatus and a method for coordinating synchronization of video and captions by delaying the output of video or captions for a predetermined period of time, or by controlling synchronization information of the caption data are provided. The apparatus for coordinating synchronization of video and captions includes a first decoding unit to decode video data, a second decoding unit to decode caption data, and an output control unit to control the output time of the decoded caption data and the decoded video data according to predetermined control information.
摘要:
A method, a media renderer device and a media source device for providing content over a network, and a message structure for controlling a real-time transport protocol (RTP) are provided. The method includes transferring a hypertext transfer protocol (HTTP) control command generated so that content is provided from a media server providing content using a RTP. The HTTP control command can use an HTTP POST command or an HTTP PUT command. When transferring AV content using a RTP, the content is controlled using an existing HTTP not a Real-Time Streaming Protocol (RTSP). Accordingly, a RTP can be more easily supported.