Abstract:
Disclosed is an operating method for a device which enables periodic hopping at a certain interval using a channel-hopping sequence for improving the degradation of RF reliability that arises in a channel access scheme based on a single frequency.
Abstract:
Disclosed are an RFID reader (110), an RFID tag (120), and a controlling method thereof. The RFID tag (120) may include a state information generator (126) to generate state information of the RFID tag (120), a receiver (121 ) to receive an activation command including reference state information of the RFID tag (120), and a controller (122) to activate the RFID tag (120) based on the state information and the reference state information. The RFID tag (120) may be selectively activated according to an inner state of the RFID tag (120).
Abstract:
A radiation patch having a shape of linearly-tapered rectangle for a planar inverted F antenna is disclosed. The planar inverted F antenna having a radiation patch includes: a ground unit for grounding a radiation patch; a short unit for shorting the radiation patch; a feeding unit for supplying an electric power to the radiation patch; and a radiation patch for radiating electric power from the feeding unit, wherein the radiation patch having a shape of linearly tapered rectangle and a length and width of tapered sides of radiation patch is determined according to a resonate frequency. As mentioned above, the present invention can be easier to be designed and provide wider bandwidth by providing a linearly tapered rectangle shape of radiation patch in a planar inverted F antenna.
Abstract:
The present invention relates to a mobile radio frequency identification (RFID) reader and a RFID communication method using a shared system clock. According to the present invention, clock for synchronizing the mobile RFID readers can be shared without changing hardware of a conventional RFID device. Also, since the shared clock is used, a technology for preventing a collision with the readers can be easily realized in a mobile multi-reader environment.
Abstract:
A time synchronization method in a wireless sensor network, a low power routing method using a reservation scheme, and an apparatus for performing the method are provided. The time synchronization method in the wireless sensor network may include: receiving a first synchronization request command packet from a parent node that manages time synchronization for a predetermined synchronization region; receiving, from the parent node, a second synchronization request command packet that has a transmission timestamp value of the first synchronization request command packet; and performing time synchronization for a child node based on a reception time of the first synchronization request command packet, a reception time of the second synchronization request command packet, and the transmission timestamp value of the first synchronization request command packet.
Abstract:
Provided is a communication method for radio frequency identification (RFID). In order to transmit a command message to an RFID tag, a RFID reader generates a command message comprising a command code indicating a type of command to be delivered to the RFID tag, a response format having one or more bits for indicating a type of additional data to be added to a response message to be received from the RFID tag (S501 ), and an identifier identifying the RFID tag; and transmits the command message to the RFID tag (S502), thereby allowing the RFID tag to immediately transmit the additional data via the response message (S503) in response to the command message (S506). Additional data comprises URL (uniform resource locator), URN (uniform resource name) or state information about a sensor connected to the RFID tag and sensor data obtained by the sensor.
Abstract:
A time division multiple access (TDMA) control method used by a mobile radio frequency identifier (RFID) reader through a mobile phone base station and a mobile RFID reader are provided. Each mobile RFID reader occupies a frequency channel during a time slot allocated through a mobile communication base station, thereby avoiding interference between readers.
Abstract:
A mobile multimedia terminal for a CALM (Continuous Air interface for Long and Medium range) system includes, a wireless multimedia communications transceiver (110) for transmitting and receiving signals over at least two wireless media; a communications link determination and management unit (120) for acquiring interface IDs of the wireless media over which the wireless multimedia communications transceiver receives wireless multimedia signals and establishing communications channels for each of the wireless media whose interface IDs are acquired; and a wireless communications control unit for controlling the communications link determination and management unit (120) to acquire the interface IDs and establish the communications channels, and for controlling data transmission and receipt via the established channels.