Abstract: Provided are a system and method for multi-mode integrated management for a multi-radio communication environment. The system includes a receiver configured to receive radio channel state information, a memory in which a program for operating an access point division in consideration of the radio channel state information is stored, and a processor configured to execute the program, wherein the processor manages an interface between a cellular base station and a radio access control device.

Abstract: A channel control method and apparatus for improving the transmission capacity of packet data and communications reliability in V2X vehicle packet communications. In V2X wireless communications, the number and bandwidths of transmission channels are predetermined. The control method monitors signal levels received between transceivers and the frequency of channel usage, and based on the result. of the monitoring, varies at least one of the bandwidth of frequency channels and the number of transmission channels. The control method is adaptive to wireless channels. The bandwidth of a transmission channel is variably assigned to, depending on whether the channel status for signal reception is good or bad. The number of transmission channels is variably assigned to, depending on whether the usage frequency of a reception channel is low or high.

Abstract: Provided are a system and method for collaboratively selecting resources in which the reliability of transmission data is ensured and the efficiency of a transmission channel is maximized. The system for collaboratively selecting resources includes a packet generator, a selector configured to select resources in consideration of a determinant including at least one of information on a packet and transmission environment information of the packet, and a packet transmitter configured to transmit the packet through the selected resources.

Abstract: Provided is a packet transmission method of a communication device. The packet transmission method includes randomly determining a first packet transmission time of a first packet which is to be transmitted in an nth beacon interval, generating the first packet, and transmitting the first packet at the first packet transmission time.

Abstract: The present invention relates to a method and apparatus for providing a driver-customized service. The present invention is configured to collect bio-signal information of a driver from a first sensor, collect current health condition information of the driver based on data stored in a health information DB, collect environmental condition information of an interior of a vehicle from a second sensor, collect environmental condition information of an exterior of the vehicle from a third sensor, generate a driving index based on the pieces of information collected from the first to third sensors and the health information DB, and perform a vehicle control operation corresponding to the driving index. Accordingly, the present invention not only enables the accident risk of drivers to be decreased, but also allows the drivers to drive their vehicles, which were considered to be only transportation means, in a safer and more comfortable environment.

Abstract: In a wireless multi-hop network, a transmission scheduling apparatus calculates a transmission demand of every node within the wireless multi-hop network, and allocates a time slot to each node by using the transmission demand of each node.

Abstract: In a vehicle communication system, a frame transmitting apparatus gives a transmission opportunity to an emergency frame received from an upper layer without EDCA (Enhanced Distributed Channel Access), and gives a transmission opportunity to a generic frame received from an upper layer through EDCA.

Abstract: In a vehicle communication system, a multi channel operation apparatus for communication of a vehicle or a road side base station operates a multi channel in one physical layer and differentially transmits a frame through a corresponding channel according to a user priority order value of a frame to transmit.

Abstract: An apparatus and method for controlling congestion in a vehicular communication, capable of preventing the network throughput from being lowered due to increase in the number of vehicles, the method including: determining whether a communication channel is in a congestion condition as a message to be transmitted exists; and if determined as the congestion condition, transmitting a message in a transmission section that is determined within a time frame based on a current position.

Abstract: When supporting the handover from first road side equipment of a plurality of sets of road side equipment and second road side equipment that is adjacent to the first road side equipment to a vehicle, the first road side equipment generates a first channel seizing signal that is longer than that of the second road side equipment in a control channel of an N-th sync interval. The second road side equipment generates a second channel seizing signal that is longer than that of the first road side equipment in a control channel of an (N+1)-th sync interval.

Abstract: A safe driving providing system for supporting a safe driving of a vehicle includes: a radar for transmitting a signal of a predetermined frequency bandwidth to a plurality of vehicles, analyzing signals provided by the vehicles, calculating location information and distance information of the vehicles, and finding inter-vehicle distance information of the vehicles based on the location information and the distance information; and a controller for receiving operation speed information from a vehicle information terminal device installed in each vehicle, determining driving safety of the plurality of vehicles based on the received operation speed information and inter-vehicle distance information provided by the radar, and transmitting a warning message for safe driving to the vehicle information terminal device.

Abstract: In order for a source node including a vehicle multihop protocol unicast apparatus to route data to a destination node, the source node broadcasts a location request message to neighbor node and receives a location response message from the neighbor nodes in response to the location request message. Therefore, the source node routes unicast data on the basis of the location information of the destination node included in the location response message. At this time, the source node uses a location based forwarder selecting algorithm in order to select a forwarder.

Abstract: A first roadside equipment operates as a transmitting/receiving mode in a control channel interval of an Nth synchronization interval so as to support a handover. In this instance, a second roadside equipment neighboring to the first roadside equipment operates as a receiving mode in the control channel interval of the Nth synchronization interval. The first roadside equipment operates as the receiving mode in a control channel interval of an (N+1)th synchronization interval. In this instance, the second roadside equipment operates as the transmitting/receiving mode in the control channel interval of the (N+1)th synchronization interval.

Abstract: A device for allocating a channel by using wireless access in a vehicular environment in which an onboard unit is provided in a vehicle and at least one roadside unit is provided, receives a service announcement message from at least one roadside unit, uses the service announcement message to generate an available service table, determines whether the available service table has roadside unit entries for transmitting the service announcement message, and if so, compares average RSSI provided by the roadside units to select a roadside unit to access, selects a channel that corresponds to the service provider ID with the highest priority from among the service provided by the selected roadside unit, and assigns the selected channel as a service channel to exchange information with the roadside unit.

Abstract: In a wireless multi-hop network, a transmission scheduling apparatus calculates a transmission demand of every node within the wireless multi-hop network, and allocates a time slot to each node by using the transmission demand of each node.

Abstract: The present invention provides a method and apparatus for multicast transmission of a transmitting station in a wireless network. The method according to the present invention transmits a plurality of data packets to a plurality of receiving stations, receives information on loss of the plurality of the data packets from at least one of the plurality of the receiving stations, codes the plurality of the data packets into a single coded data packet based on the information on the loss of the plurality of the data packets and transmits an error control frame including the coded data packet to the plurality of the receiving stations. Therefore, when an error occurs at a data packet that a transmitting station transmits to a plurality of receiving stations by a multicast transmission, a number of retransmission of the data packet can be reduced.

Abstract: The apparatus includes a data normalization unit, a neural network problem prediction unit, and a transition change prediction unit. The data normalization unit creates normalization transformation values by performing normalization transformation based on threshold value ranges for a plurality of pieces of vehicle network data. The neural network problem prediction unit creates a neural network problem prediction value by predicting a mixed problem with the vehicle using a multi-artificial neural network model, created based on a learning data set related to mixed problems having previously occurred in the vehicle and the normalization transformation values. The transition change prediction unit predicts a change in transition for the mixed problem according to a change in the neural network problem prediction value, by analyzing the neural network problem prediction value and previous neural network problem prediction values previously created in the vehicle.

Abstract: An apparatus for time synchronization of an orthogonal frequency division multiplexing (OFDM) system oversamples a received signal using a master clock having a frequency at least four times higher than a minimum sampling frequency in a transmission apparatus, sets one of a plurality of oversampled signals to an on-time signal, and shifts each of the remaining oversampled signals by a predetermined time on the basis of the on-time signal. The apparatus for time synchronization calculates a correlation value by correlating each of the shifted signals and the on-time signal with a previously known signal, detects a maximum energy value among the calculated correlation values, and detects a start point of a frame by comparing the maximum energy value with a predetermined threshold value.

Abstract: In a vehicle communication system, a frame transmitting apparatus gives a transmission opportunity to an emergency frame received from an upper layer without EDCA (Enhanced Distributed Channel Access), and gives a transmission opportunity to a generic frame received from an upper layer through EDCA.

Abstract: A cooperative communication method for vehicular communication is provided. The method in which when one vehicle transmits a signal to another vehicle, a signal of a transmission vehicle passes through a roadside device or a plurality of vehicles and thereafter signals having a plurality of paths are transmitted to a reception vehicle, and the reception vehicle combines and demodulates the signals received through the plurality of paths.