摘要:
Provided are an apparatus and method for transmitting multi-carriers to provide a high-quality service to multicast-based service subscriber terminals. The method includes: mapping first data for providing the multicast service, and second data different from the first data, to different antennas; converting the first mapped data into a first Intermediate Frequency (IF) signal and the second mapped data into a second IF signal; converting the first IF signal into a first RF signal having a carrier frequency, and deciding a power intensity of the first RF signal so that the first RF signal is transmitted over the entire coverage region of the base station; and converting the second IF signal into a second RF signal having the other carrier frequency, and deciding a power intensity of the second RF signal so that the second RF signal is transmitted over a predetermined region around the base station.
摘要:
A technology is provided capable of improving the efficiency of an OFDM system by obtaining the performance in Bit Error Rate (BER) in a wireless communication using OFDM and determining the minimum FFT input bit that produces a SNR difference of 0.1 dB or below with respect to a theoretical BER graph at a desired performance.
摘要:
A technology is provided capable of improving the efficiency of an OFDM system by obtaining the performance in Bit Error Rate (BER) in a wireless communication using OFDM and determining the minimum FFT input bit that produces a SNR difference of 0.1 dB or below with respect to a theoretical BER graph at a desired performance.
摘要:
A technology of setting up a MBS zone for providing a mobile IPTV service is provided in which the MBS zone is effectively managed, so that QoS is prevented from being degraded due to the handover delay that is caused by a MBS handover occurring when a user moves between MBS zones.
摘要:
There are provided a wireless communication system for providing diversity gains for multicast services and a method of providing a multicast service. According to the wireless communication system, by transmitting, when terminals are partially distributed in each cell, data to areas where no user exists so as to reduce interference between other MBS (Multicast Broadcast System) zones and other cells that transmit only unicast services, performance deterioration may be minimized.
摘要:
The present invention relates to an IPTV service device and method for providing continuous service. The method according to one embodiment of the present invention comprises: a service-request receiving step of receiving an IPTV service request from a user of an IPTV terminal; a service-confirming step of confirming whether or not the IPTV service has previously been stopped in response to the IPTV service request; and an IPTV-service providing step of providing the IPTV service to the IPTV terminal from the point at which service was stopped if the IPTV service has previously been stopped.
摘要:
Provided are a method and apparatus for configuring a Multicast and Broadcast Service (MBS) zone dynamically in a mobile communication environment. According to an example, there is provided a method of seamlessly changing base stations configuring a MBS zone whenever one or more mobile terminals configuring the MBS zone move or whenever a predetermined time period has elapsed to thereby provide a MBS with excellent quality while saving radio resources.
摘要:
An efficient switching device and a method for fabricating the same using multiple shared memories are provided. The switching device includes: an output time determination unit to determine an output time to an output port; an output time administration unit to administer a possible data output time for each output port; a memory bank selection unit to select a memory bank with an empty data output time position; a memory bank utilization information administration unit to administer utilization information per output time; a connection unit to deliver transmission data to an output time position; a shared memory unit to store the data in the output time position, to administer dispersed shared memory banks according to an output time, and to read and output transmission data; and an output port connection unit receiving output data to read and transmit output port information of the data to a corresponding output port.
摘要:
Provided is an apparatus for changing Media Access Control (MAC) address, which is a conventional subscriber hardware identification address for identifying each subscriber, and a method thereof. The MAC address changing apparatus includes a frame receiving block for determining whether to change a source MAC address; a switch controlling block for controlling a switch; a change MAC address generating block for changing the source MAC address of the received frame; a change MAC address storing block for storing information of the change MAC address and the source MAC address corresponding thereto; a MAC address forwarding and lookup block for extracting output port information; a MAC address replacing block for forming an output frame by replacing the source MAC address; a MAC address storing block for storing a MAC address; and a frame transmitting block for transmitting the output frame.
摘要:
The present invention relates to a system and a method for a mobile broadcast service, a controller, and a method for driving the controller. The system for a mobile broadcast service forms an MBS zone only with base stations having user demand for an MBS. For example, when there is a request for an MBS from a base station, if an MBS zone already exists which is providing the requested MBS, then the corresponding base station is included in the previously generated MBS zone. In contrast, if there are no more users using an MBS via a base station that is part of an MBS zone, then the base station in question is excluded from the MBS zone. Thus, an MBS zone can be dynamically formed by including or excluding a base station, forming an MBS zone, on the basis of an existence of an MBS user.