Abstract: A wireless communication device includes: a wireless communication unit that is configured to: perform a wireless communication in a first mode using a first frequency band serving as a first communication channel; and perform the wireless communication in a second mode using a second frequency band including the first communication channel and a second communication channel that is adjacent to the first communication channel; a detection unit that is configured to: monitor each of the first frequency band and the second frequency band; output a first detection signal when an interference signal is detected in the first frequency band; and output a second detection signal when the interference signal is detected in the second frequency band; and a determination unit that determines whether the interference signal is in the first communication channel or in the second communication channel based on the first and second detection signals.

Abstract: A wireless communication apparatus includes a first module, a second module, an inhibit module, a calculation module, and a control module. The first module constitutes a first system. The first system transmits and receives first data to and from a first device. The second module constitutes a second system. The second system transmits and receives second data to and from a second device in each interval time-divided with determined transmission timing. The inhibit module generates inhibit periods for preventing the first module from communicating by use of the first data. The calculation module calculates an occupation time required for the transmission and reception of the first data. The control module compares the period between the inhibit periods adjacent to one another with the occupation time and, according to the comparison result, instructs the first device to stop or delay the transmission of the first data.

Abstract: A wireless communication apparatus includes a transmission and reception unit, a monitoring unit, and a control unit. The transmission and reception unit transmits and receives a frame to and from a wireless communication terminal. The monitoring unit monitors an interference signal in a first communication channel. The control unit selects a second communication channel and a third communication channel. The second and the third communication channels are different from the first communication channel. The transmission and reception unit transmits an instruction frame to the wireless communication terminal when the monitoring unit detects the interference signal in the first communication channel. The instruction frame includes information on the second and third communication channels and instructs the wireless communication terminal to switch the communication channel from the first communication channel to at least one of the second and third communication channels.

Abstract: A communication method includes causing a transmitter to apply error correcting or detecting code systems to multiple frames or packets and to transmit the multiple frames or packets in succession, causing a receiver to receive the transmitted frames or packets and to decode each of the frames or packets received, and causing the receiver to send an acknowledgment signal to the transmitter on the basis of the results of decoding of the frames or packets. The transmitter applies two or more error correcting or detecting code systems to the frames or packets.

Abstract: A communication method includes causing a transmitter to apply error correcting or detecting code systems to multiple frames or packets and to transmit the multiple frames or packets in succession, causing a receiver to receive the transmitted frames or packets and to decode each of the frames or packets received, and causing the receiver to send an acknowledgment signal to the transmitter on the basis of the results of decoding of the frames or packets. The transmitter applies two or more error correcting or detecting code systems to the frames or packets.

Abstract: A wireless communication device includes a physical layer protocol processor which can transmit and receive data by first to Nth communication schemes, where ith communication scheme has compatibility with the first to (i?1)th communication scheme. A first controller generates a first frame for forbidding communication by the first to Nth communication schemes for a first period, and orders the physical layer protocol processor to transmit the first frame by the first communication scheme. A second controller generates a second frame for lifting the forbiddance on communication, and orders the physical layer protocol processor to transmit the second frame by a jth communication scheme. A third controller generates a third frame for forbidding communication by a (j+1)th to Nth communication schemes for a second period, and orders the physical layer protocol processor to transmit the third frame by the (j+1)th communication scheme.

Abstract: When a wireless communication apparatus transmits a data frame requesting an ACK frame, it is expected that a receiver station will transmit the ACK frame. A preamble analyzer analyzes whether or not a preamble pattern added to the header of a received frame exists from the time it is expected that the ACK frame will be received. When a desired preamble pattern is detected, the preamble analyzer supplies instructions to start an operation of demodulating a reception signal to a demodulator via a controller.

Abstract: A communication device of an example of the present invention comprises a first unit determining that whether a state is a first state indicating that a transmission medium is in use, a second state indicating that the transmission medium is not in use, or a third state indicating that whether or not the transmission medium is in use is being determined, and a second unit prohibiting a data transmission in the first and third states, and permitting the data transmission in the second state.

Abstract: A header analysis unit reads a parameter showing a format of a digital signal contained in a received signal. A received signal quality measurement unit measures a quality of the received signal. An awake/sleep control unit controls restart and sleep of a reception unit based on data from the header analysis unit and the received signal quality measurement unit. The awake/sleep control unit stops a reception operation for a period corresponding to a frame length when the quality of the leading portion of the received signal is less than a predetermined threshold.

Abstract: A wireless communication apparatus includes a reception unit, an information management unit, and a transmission unit. The reception unit receives data including a plurality of data frames. The data frames are transmitted from an identical data source and managed by an identical traffic identifier. The information management unit retains acknowledgement information to perform an acknowledgement. The information management unit discards an already-retaining acknowledgement information when the data is newly received. The transmission unit performs the acknowledgement to the data source of the data using the acknowledgement information. The transmission unit performs the acknowledgement to the data corresponding to the acknowledgement information irrespective of a request of the acknowledgement from the data source when the information management unit discards the acknowledgement information or when a prediction on the discard of the acknowledgement information is made.

Abstract: A wireless communication apparatus includes a transmission and reception unit, a monitoring unit, and a control unit. The transmission and reception unit transmits and receives a frame to and from a wireless communication terminal. The monitoring unit monitors an interference signal in a first communication channel. The control unit selects a second communication channel and a third communication channel. The second and the third communication channels are different from the first communication channel. The transmission and reception unit transmits an instruction frame to the wireless communication terminal when the monitoring unit detects the interference signal in the first communication channel. The instruction frame includes information on the second and third communication channels and instructs the wireless communication terminal to switch the communication channel from the first communication channel to at least one of the second and third communication channels.

Abstract: A wireless communication apparatus includes a received frame analysis unit, a received frame bitmap information storage unit, a bitmap reset determination unit, a Block Ack frame generation unit, and a TID bitmap storage unit. The received frame analysis unit analyzes a received MAC frame. The received frame bitmap information storage unit stores delivery acknowledgement of the received MAC frame. The bitmap reset determination unit determines whether or not information stored in the received frame bitmap information storage unit should be reset or not. The Block Ack frame generation unit generates a Block Ack frame including a bitmap to be stored in the received frame bitmap information storage unit on the basis of the delivery acknowledgement request analyzed by the received frame analysis unit. The TID bitmap storage unit stores an identifier of a frame allowing the received frame bitmap information storage unit to store the delivery acknowledgement.

Abstract: A wireless communication apparatus includes a transmission section and a control section. The transmission section transmits data using wireless communication. The control section controls a transmission rate for the transmission section. The control section limits data size of data to be transmitted to at most a prescribed value and requests a transmission acknowledgement, during a period from immediately after a change in the transmission rate until number of times that the transmission section transmits data reaches a prescribed number of times.

Abstract: A wireless communication device includes: a wireless communication unit that is configured to: perform a wireless communication in a first mode using a first frequency band serving as a first communication channel; and perform the wireless communication in a second mode using a second frequency band including the first communication channel and a second communication channel that is adjacent to the first communication channel; a detection unit that is configured to: monitor each of the first frequency band and the second frequency band; output a first detection signal when an interference signal is detected in the first frequency band; and output a second detection signal when the interference signal is detected in the second frequency band; and a determination unit that determines whether the interference signal is in the first communication channel or in the second communication channel based on the first and second detection signals.

Abstract: A radio communication system includes one master station which performs transmission without being controlled by another radio station and which is configured to independently set a channel for use in a radio communication, and at least one slave station which belongs to the one master station and whose radio communication channel used and transmission/reception operations are controlled by the master station. When detecting an interference signal which disturbs the radio communication during operation, the one master station or the at least one slave station sets a first modulation scheme applied to the radio communication to the same second modulation scheme as a modulation scheme used in broadcast in order to convey information necessary for an evasive action to move to another radio communication channel.

Abstract: According to an aspect of the invention, there is provided a wireless communication apparatus including an aggregation frame creating section which creates an aggregation frame into which a plurality of MAC frames are integrated, a transmission section which transmits the aggregation frame to a destination apparatus, a reception section which receives a delivery acknowledgment response frame including information indicating whether or not each of the MAC frames in the aggregation frame has safely been received, a time measurement section which measures a time for which reception of the delivery acknowledgment response frame is waited, and a selection section which selects retransmission of the aggregation frame to the destination apparatus or transmission of a delivery acknowledgment request frame requesting the delivery acknowledgment response frame when the reception section has not received the delivery acknowledgment response frame after the time measured by the time measurement section has reached a pred

Abstract: A communication method includes causing a transmitter to apply error correcting or detecting code systems to multiple frames or packets and to transmit the multiple frames or packets in succession, causing a receiver to receive the transmitted frames or packets and to decode each of the frames or packets received, and causing the receiver to send an acknowledgment signal to the transmitter on the basis of the results of decoding of the frames or packets. The transmitter applies two or more error correcting or detecting code systems to the frames or packets.

Abstract: A wireless communication apparatus includes an M-number of (M is an integer of 2 or more) receiving portions connected to respective antennas, a frame analyzing section configured to analyze a reception signal received by the M-number of receiving portions, and a selecting section configured to select a receiving portion to be in service from the M-number of receiving portions. The selecting section selects a P-number of (P is an integer of from 0 to M) receiving portions from the M-number of receiving portions, based on an analysis result obtained by the frame analyzing section.

Abstract: A wireless communication system includes a first communication apparatus, a second communication apparatus, and a third communication apparatus which are mutually communicable by wireless. The second communication apparatus includes a receiving section for receiving a signal and a transmission section. The transmission section transmits a first transmission signal whose destination is the third communication apparatus with power enough to reach both the first communication apparatus and the third communication apparatus, and transmits a second transmission signal whose destination is the third communication apparatus in accordance with a response signal from the third communication apparatus including an information related to received power or receipt quality of the first transmission signal in the third communication apparatus with power enough to reach the third communication apparatus.

Abstract: A vehicle information communication system determines whether or not an identifier code such as a telephone number is different from that currently registered in a vehicle-equipped information communication system wherein the vehicle belongs to a group of previously registered telephone numbers when a portable telephone having such telephone number is connected thereto, then considers that another portable telephone of a regular user is connected thereto if such telephone number belongs to the group, and then transmits such telephone number of another portable telephone to an information center. The information center can automatically update the currently registered telephone number to a new telephone number when it receives the new telephone number. Accordingly, a vehicle information communication function can be used by a user in a similar manner when the user who has a plurality of individual portable telephones uses the same vehicle.