53results about How to "Avoid Signal Conflicts" patented technology

A communication apparatus communicates with another communication apparatus connected to a transmission channel and sharing a communication band. The communication apparatus includes: a receiving unit that receives, through the transmission channel, data including time information based on a transmission time when a synchronous signal is transmitted to the transmission channel from a synchronous signal transmitting apparatus at a given cycle, the synchronous signal for synchronizing a plurality of communication apparatuses; a transmitting unit that transmits data to the transmission channel; and a transmission control unit that estimates a synchronous signal non-existing period in which there is no synchronous signal on the transmission channel on the basis of the time information received by the receiving unit and the given cycle, and controls the transmitting unit to transmit data within the estimated synchronous signal non-existing period.

A communication timing control apparatus for use in the nodes of a communication system includes a signal communication unit that transmits a state variable signal to neighboring nodes and receives state variable signals from those nodes. An external control signal, such as a beacon signal transmitted by a control node, is also received. The state variable signals indicate internal operating states or timings of the nodes; the control signal indicates a basic transition rate. A timing decision unit causes internal state or timing transitions to occur at timings responsive to the basic transition rate and the received state variable signals, adjusting the transition timings so as to avoid signal collisions and to adapt to changing system conditions, Use of the control signal enables a steady timing state to be reached quickly.

The present invention relates to a wireless LAN (Local Area Network) communication system. Upon a timer unit 108 clocking a predetermined time T after an access point 100 has transmitted a beacon signal 200, a transmission frame control unit 105 generates a CTS frame 301, and transmits an error frame 401 via a transmission frame generation unit 106, a wireless transmission unit 107 and an antenna 109. Accordingly, upon receiving the CTS frame 301, a communication terminal 20 ceases transmitting data for a NAV (Network Allocation Vector, transmission prohibition interval) period in accordance with IEEE 802.11 standard.

In communication method for communicating via a transmission channel to which first communication apparatuses communicating based on a first communication system, second communication apparatuses communicating based on a second communication system, and third communication apparatuses communicating based on a third communication system are connected, a data transmission domain and a notification domain for notifying a data transmission within the data transmission domain are allocated to the first communication apparatuses, the second communication apparatuses, and the third communication apparatuses, respectively. In the communication method, notices of the data transmission for each of the first communication apparatuses, the second communication apparatuses and the third communication apparatuses are transmitted within the notification domain, and the data transmission domain is reallocated in accordance with the notices transmitted from the first, second and third communication apparatuses.

A system for determining a real-time location of a leaf node device, the system comprising at least one battery powered Bluetooth Low Energy (BLE) enabled leaf node device, wherein the at least one leaf node device is associated with a respective monitored asset and at least one beamforming reader node communicating with the at least one leaf node via BLE, the reader node creating a plurality of sectorized beams in a plurality of sectors and from the plurality of sectors At least one of the zones collects data related to the at least one leaf node device, wherein the location processing facility determines a real-time location of the at least one leaf node device based on the data collected by the beamforming reader nodes.

A communication method in a peer aware communication system and an apparatus for transmitting / receiving using the communication method are provided. A block signal for informing of channel occupation is generated and then is transmitted through an interval in which a message signal including a preamble signal is not transmitted. A subcarrier for the block signal is different from a subcarrier for the preamble signal.

The present invention discloses a technique for avoiding a signal collision in a wireless medium to improve communication throughput. According to this technique, in a radio communication system composed of a plurality of radio communication devices in such a manner that other radio communication devices exist within the communication area of a radio communication device, a given radio communication device is assigned a time slot periodically so that it can access the wireless medium in the time slot at higher priority than the other radio communication devices. This is achieved as follows: The radio communication device monitors the wireless medium, detects other radio communication devices operating within the communication area of the radio communication device, and divide communication time on the wireless medium into time slots of equal width according to the number of other radio communication devices. Then, each radio communication device selects one of these time slots so as not to share the selected time slot with any other radio communication device, and uses a waiting time shorter than those of the other radio communication devices to access the wireless medium in the selected time slot.

The invention discloses a control circuit for multi-channel encoding and decoding integrated circuits working in parallel, so that the multi-channel encoding and decoding integrated circuits can form a multipoint-to-multipoint information transmission system. The control circuit is composed of a monostable flip-flop, a D flip-flop, an AND gate, an OR gate, an XNOR gate, a diode, a resistor, and a capacitor. It has the ability to limit the number of frames that a multi-channel encoding integrated circuit can send a serial code stream at a time; when one multi-channel encoding integrated circuit transmits a serial code stream, it shields the transmission of other multi-channel encoding integrated circuits; there are several multi-channel encoding integrated circuits When requesting to send at the same time, functions such as information can be sent in order according to the priority level. It makes the multi-point to multi-point information transmission system neither signal conflict nor lose the information that should be transmitted. The control circuit can be realized by a general digital circuit, or a semi-custom or full-custom ASIC can be prepared, or the control circuit can be integrated with a multi-channel coding integrated circuit.

The invention relates to a method for reading batch logistics labels and a logistics label system. Receive the read command sent by the controller, generate a random number not greater than the maximum value; monitor the wireless signal, if the monitoring of the logistics tag signal ends and no valid wireless signal is received, send a response signal; other logistics tags monitor The response signal enters the state of receiving the response confirmation; the logistics label that sends the response signal receives the response confirmation signal and exits the reading instruction process; the logistics label that has not sent the response signal repeats the steps until all the logistics labels send the response signal and receive the controller Acknowledgment signal sent. The invention adopts the technology of wireless signal monitoring to monitor whether the surrounding wireless signals are valid. Using random numbers to disperse the wireless signal monitoring time can effectively control the probability of conflicts caused by wireless signals sent by logistics electronic tags. The wireless signal response confirmation mechanism is adopted to effectively reduce the active number of logistics electronic tags.

The invention discloses a real-time temperature and humidity data collection system and method for an in-transit incubator of cold-chain logistics. The system comprises temperature and humidity inducing and recording incubator body equipment and hand-held terminal equipment, wherein the temperature and humidity inducing and recording incubator body equipment is arranged on the incubator and is internally provided with a temperature and humidity inducing module; the temperature and humidity inducing module comprises an MCU, a temperature and humidity sensor, a first sending and receiving module, a storage module, an RTC module and an RFID label. The temperature and humidity inducing and recording incubator body equipment supports a batch-type dormant data transmission mechanism and has the data compensating transmission function, and the hand-held terminal equipment polls temperature and humidity data of the monitored incubator body equipment periodically, records the received data and uploads the data periodically in bulk or uploads the whole data to a server after transportation is finished. Based on the characteristics of low power and low cost of 433-MHz radio frequency identification half-duplex wireless communications, the system and method reduce the cost of the incubator body equipment and data transmission consumption, prolong the use time of a battery of the incubator body equipment and reduce workloads for collecting data in bulk by logistics personnel.