Patent application number | Description | Published |
20080248768 | Radio Communication Method and Radio Communication Device - A first receiving unit typically receives a control frame in a narrowband channel. A communication data selection unit controls power saving of a second receiving unit performing reception in a UWB channel, based on the control frame. A communication data generation unit generates communication time reservation response information by adding information reporting a normal reception to the received request for communication time reservation, and transmits this information from transmitting units in the narrowband channel, so that a second receiving unit is set to an operating mode only during a time slot when UWB communication is performed, and use of the time slot for performing UWB communication is reported to the radio communication device which has made the communication request and the radio communication devices in the area where transmission is possible. | 10-09-2008 |
20080252590 | Liquid crystal display and display control method for the same - In the case where a screen divided display is performed on a liquid crystal panel, a change in brightness or chromaticity between sub regions divided may be reduced. A display includes: a display panel; a backlight arranged corresponding to each of sub regions, and selectively illuminating the corresponding sub region, the sub regions being defined by dividing a display region of the display panel into a plurality of parts; a monitoring means for monitoring the light emission state of the backlight corresponding to each of the sub regions; and a display control means for determining a sub region on which an image is to be displayed, on the basis of the monitoring result of the monitoring means, to fit the image into the determined sub region, and controlling a backlight corresponding to the determined sub region to emit light. | 10-16-2008 |
20080279214 | Radio Communication Method and Radio Communication Device - A radio communication device includes a beacon reception unit extracting a frame from a received beacon and a frame judgment unit judging whether the extracted frame is one requiring data transmission/reception or one giving notice of a collision with a beacon of another network, a frame constructing unit used when the frame judgment unit has judged that the frame is a collision notification, generating a frame for relaying the collision notification and a movement notification to a new beacon transmission period, and a beacon transmission instruction unit instructing transmission of the frame at the beacon transmission timing. Accordingly, since these notifications can be relayed, all radio communication devices of the same network can move to a new beacon transmission period while avoiding a collision with a beacon from a radio communication device of another network. | 11-13-2008 |
20090028090 | METHOD AND SYSTEM OF WIRELESS COMMUNICATION BETWEEN DEVICES - A method and system for wireless communication between devices over the same channel in a Wireless Personal Area Networks (WPANs) environment, and a device capable of wireless communication with other devices over the same channel in a WPANs environment. The method comprises the steps of broadcasting announcements from one or more WPAN control devices; providing in each announcement an announcement portion for announcing information about one or more WPAN control devices other than said respective announcing WPAN control device; and partitioning medium access time for the communication between the devices over the same channel based on the announcements. | 01-29-2009 |
20090052366 | COMMUNICATION METHOD AND WIRELESS COMMUNICATION DEVICE - A frame such as a beacon in wireless communication, with a maximum MAC address, hop count, and maximum hop count, described therein is exchanged between nodes. All the nodes measure the number of hops from a node with the maximum MAC address, and exchange the maximum hop count (hmax) out of the numbers with each other. Hop count H(a,b) between arbitrary nodes a and b is expressed by H(a,b)≦H(a,max)+H(max,b)≦2*hmax, where hmax is a hop count from node (max) with the maximum MAC address to the farthest node. That is, the number of hops between two arbitrary nodes in the group is always 2*hmax or less. Herewith, a numeric value assuredly exceeding the maximum value out of the numbers of hops between nodes in an ad-hoc network can be propagated in the entire ad-hoc network. | 02-26-2009 |
20090232056 | RADIO COMMUNICATION METHOD AND RADIO COMMUNICATION APPARATUS - A beacon slot position control section of a radio communication apparatus constituting a radio network system which detects whether empty beacon slots are present in a beacon period. When an empty beacon slot is present before the period in which the radio communication apparatus transmits a beacon, a movable counter starts counting a specified number of super frames. When the count is completed, the radio communication apparatus transmits a beacon of the radio communication apparatus at the earlier empty beacon slot. Consequently, since the empty beacon slots are eliminated and the beacon period is compacted, even if the number of radio communication apparatuses joining the radio network system fluctuates dynamically, the radio communication apparatus can perform radio communication with high efficiency and less waste of consumed electricity. | 09-17-2009 |
20090232057 | RADIO COMMUNICATION METHOD AND RADIO COMMUNICATION APPARATUS - A beacon slot position control section of a radio communication apparatus constituting a radio network system which detects whether empty beacon slots are present in a beacon period. When an empty beacon slot is present before the period in which the radio communication apparatus transmits a beacon, a movable counter starts counting a specified number of super frames. When the count is completed, the radio communication apparatus transmits a beacon of the radio communication apparatus at the earlier empty beacon slot. Consequently, since the empty beacon slots are eliminated and the beacon period is compacted, even if the number of radio communication apparatuses joining the radio network system fluctuates dynamically, the radio communication apparatus can perform radio communication with high efficiency and less waste of consumed electricity. | 09-17-2009 |
20100008334 | RADIO COMMUNICATION METHOD AND RADIO COMMUNICATION DEVICE - A radio communication device includes a communication data selection unit for selecting from the received radio communication data containing communication time reservation request information in which a time slot for performing data transmission source radio communication device is described and a communication information analysis unit for extracting an identifier of the source radio communication device and the data transmission reservation time slot from the communication time reservation request information in the radio communication data. When the received radio communication data is addressed to the local device, a communication/response information generation unit correlates the identifier to the reservation time slot, records them in a communication reservation table, and generates communication time reservation response information including information of the reservation time slot. | 01-14-2010 |