52results about How to "Avoid Signal Conflicts" patented technology

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 sates 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 invention discloses a novel multi-channel medium access control method of a wireless sensing network, comprising the following steps of extracting a clock, a physical address and superframe information from a received beacon; taking the extracted physical address as a seed by an arbitrary node which receives beacons of other nodes to obtain a pseudo random sequence and calculating channels located by other nodes according to the pseudo random sequence; acquiring an awakening time slice of a receiving party according to the extracted superframe information and carrying out random delay andsignal strength detection by the arbitrary node when the arbitrary node sends data to the receiving party. The invention enhances the reliability of the network, efficiently avoids signal conflict bydividing a large superframe into a plurality of small time slices, simultaneously realizes a mechanism that nodes with different superframe sizes are mutually communicated and also ensures that transmission of generated data is not influenced by utilizing the withdrawn mechanism after collision so as to realize successful current data communication.

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.

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 method for preventing signal collision in radio frequency identification (RFID) system through random code timing is disclosed. The RFID system includes one or more RFID reading device to receive respective tag information from a plurality of RFID tags. Multiple RFID tags of the RFID system each includes a microprocessor connected to a random code generation unit, a power supply unit, a memory unit and a radio frequency transceiver module. The memory unit stores the respective tag information that contains a tag identification code. The microprocessor of the RFID tag issues a base number or uses the tag identification code to generate a random code and a tag signal is transmitted to the RFID reading device in accordance with the random code so generated.

A system for determining real time location of leaf node device, the system including 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 corresponding monitored asset; and at least one beam forming reader node in communication, via BLE, with the at least one leaf node, the reader node creating a plurality of sectorized beams in a plurality of sectors and collecting data related to the at least one leaf node device from at least one of the plurality of sectors, wherein a location processing facility determines the real-time location of the at least one leaf node device based on the data collected by the beam forming reader node.

A communication method of communicating among a plurality of communication apparatuses connected to a transmission channel and sharing a communication band is provided. The communication method includes: sequentially updating a slot ID with the lapse of time by a first communication apparatus; transmitting first data and a first access ID to the transmission channel by the first communication apparatus after the lapse of a first waiting time and when the slot ID is updated to a first slot ID corresponding to the first access ID; transmitting second data and a second slot ID to the transmission channel by a second communication apparatus after the lapse of a second waiting time longer than the first waiting time; and receiving the second slot ID by the first communication apparatus. In updating the slot ID, the slot ID is updated to a slot ID subsequent to the second slot ID.

The embodiment of the invention provides a chip, a chip set, an electrical parameter detection method, consumables and an image forming device. The chip is detachably installed on the consumables, theconsumables and at least one first consumable are detachably installed on the same image forming device, each first consumable is provided with a first chip, the image forming device includes a mounting detection pin, the chip and the first chip are electrically connected with the mounting detection pin through the same communication bus, and the chip includes a mounting detection terminal configured to be electrically connected with the mounting detection pin of the image forming device through the communication bus, and a chip control unit configured to control the mounting detection terminal to output a low level after the chip is powered on, so that a current loop is formed between the chip and the image forming device, and the time for forming the current loop between the chip and the image forming device is different from the time for forming the current loop between the first chip and the image forming device. When whether the plurality of chips are in good contact with the image forming device is detected, the plurality of chips do not generate a signal conflict problem.

A wireless communication apparatus includes: a short-range receiver that designates, as a reception channel, a control channel or one of service channels; a channel switcher section that switches between the control channel and the service channel in designating the reception channel; a collision determiner section that determines presence of service provider stations and a collision of service start informational items transmitted by the respective service provider stations based on (i) that a service execution informational item is received under states where the service channel is designated as the reception channel, and simultaneously (ii) that a reception error is detected under states where the control channel is designated as the reception channel; and a collision notice processor section that transmits a signal collision notice from a predetermined notice transmitter based on that the collision determiner section determines the collision of the service start informational items.

The present invention relates to a reading method of batch logistics labels and a logistics label system. The method comprises the steps of: receiving a reading command sent by a controller, and generating a random number being not larger than an maximum value; performing wireless signal monitoring, finishing monitoring if there are logistics label signals, and sending response signals if valid wireless signals are not received; entering a state of receiving response confirmation if other logistics labels monitor the response signals; receiving the response confirmation signals by the logistics labels sending the response signals, and quitting a reading command process; and allowing the logistics labels without sending the response signals to repeatedly perform the steps until all the logistics labels send the response signals and receive the response confirmation signals sent by the controller. Through adoption of the wireless signal monitoring technology, the reading method of batchlogistics labels and the logistics label system monitor wireless signals around are valid or not, employ the random number to diverge the wireless signal monitoring duration to effectively control theprobability of conflict generation of the logistics electronic labels sending wireless signals, and employ the wireless signal response confirmation mechanism to effectively reduce the active numberof the logistics electronic labels.

The disclosed control circuit for concurrent working of multiplex-coding IC comprises: a monostable trigger, a D-trigger, a AND gate, an OR gate, a NOR gate, a diode, a resistor, and a capacitor, wherein it can screen other for one IC transmitting, or sends message as PRI when some IC request at one time. The circuit can be implemented by different ways. This invention avoids conflict or message missing in multipoint-to-multipoint information transmission system.

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.

The invention discloses a wireless communication system and method for micro-rail vehicle control, and the system enables a rail line to be divided into a plurality of sections through a positioning mark, a trackside communication unit is installed at the central position of each section, the reliable communication range covered by the trackside communication units is a communication section, andeach communication section is provided with a communication channel. The communication channels of the adjacent communication sections are different, the trackside communication units are connected through a field bus, a vehicle-mounted communication unit is installed on the carriage, the vehicle-mounted communication unit establishes connection with the trackside communication units by switchingthe communication channels, and the trackside communication units allocate communication addresses to the vehicle-mounted communication unit. And the trackside communication units exchange data with the vehicle-mounted communication unit in turn in a time-sharing manner to realize information interaction between the trackside communication unit and the vehicle-mounted communication unit. The problems that existing micro-rail vehicle communication is prone to interference, and real-time performance and safety cannot be guaranteed are solved.

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.