468 results about "Message frame" patented technology

A method for selecting an access point by considering state information including the number of mobile stations connected in each access point and a traffic amount at each access point is disclosed. The method includes the steps of a) at access points, inserting a first state information of the access point about the number of connected mobile stations into a Beacon frame/Probe Response message frame; b) at the access points, the Beacon frame/Probe Response message frame of the first state information is transmitted to the mobile station; c) at the access points, inserting a second state information about a traffic amount into the Beacon frame/Probe Response message frame; d) at each the access points, the Beacon frame/Probe Response message frame of the second state information is transmitted to the mobile station; and e) at the mobile station, selecting one of access points based on the first and second state information.

A client connected to a network switch is continuously authenticated to a network switch by using biometrics, wherein the client and the network switch exchange Ethernet/802.3 frames associated with a client application, and wherein the client and the network switch are coupled by a full-duplex Ethernet/802.3 communication channel. A biometric data sample of a user of the client is captured. Biometric data is encapsulated in an authentication protocol message frame. The authentication protocol message frame is separated into a sequence of a plurality of fragments, each fragment having a predetermined number of bytes. Respective sequence numbers are assigned to each of the fragments. Each of the fragments is inserted with its respective sequence number in a respective preamble of a respective one of a plurality of Ethernet/802.3 frames associated with the client application that are being transmitted from the client to the network switch.

The embodiment of the invention discloses a method and a device for searching for a multicast forwarding table, at least two keywords are mainly obtained from the received data message frame head; the keywords at least comprise a first level keyword and a second level keyword; according to the first level keyword, an address index of the second level multicast forwarding table corresponding to the first level keyword is obtained by searching in the first level multicast forwarding table; in terms of the address index of the second level multicast forwarding table and the second level keyword, the list item contents corresponding to the address index of the second level multicast forwarding table and the second level keyword are obtained by searching in the second level multicast forwarding table. It can save the storage space, reduce the search time and include better universality and expandability by using the technical proposal above.

The present invention provides a priority scheme and a data rate reduction method to increase the reliability of the signaling messages on a shared packet data channel. Signaling messages and packet data received for transmission are stored in a packet data buffer and at least one signaling buffer, respectively. Packet data or signaling messages are transmitted based on the scheduling algorithm assigned priority. The signaling message priorities are adjusted by a weighting factor assigned to the signaling buffer. The signaling message priority may be adjusted by a Quality of Service level. The transmission data rate is adjusted by an offset factor from the highest possible data rate that can be supported to a lower rate to improve reliability. To increase the effective data rate, the signaling message may be concatenated with another signaling message in order to completely fill the signaling message frame.

The invention provides a measuring method and system of packet loss, wherein the measuring method comprises the following steps: a first end obtains a received frame number of a current measure response frame and a frame number of a previous measure response frame, wherein the current measure response frame and the previous measure response frame are obtained by enabling a second end to respond to a packet loss measure message frame transmitted by a first end; the first end judges whether the difference between the frame number of the current measure response frame and the frame number of the previous measure response frame is 1 or not; and if the difference is 1, the first end figures out the packet loss according to the current measure response frame and counting information carried in the previous measure response frame; and if the difference is more than 1, the first end calculates to obtain the packet loss according to the current measure response frame and the counting information carried in the previous measure response frame as well as the difference between the frame numbers. According to the invention, the problem of inaccuracy in the packet loss measurement while the protocol frame loss exists in the prior art is solved so that a technical effect of accurately measuring the packet loss is realized.

The invention discloses a high-efficiency multi-tag anti-collision radio frequency identification (RFID) method, which mainly comprises a tag division process and a tag searching process. An ALOHA frame or other signal frames are established in the tag division process; and in the tag division process, time slots are randomly selected for tags to transmit IDs, and function in dividing a tag group consisting of all the tags in the range of a reader-writer into a plurality of independent small tag groups. In the tag searching process, a plurality of message frames are involved; and each frame corresponds to a specific collision time slot in the tag division process, and in the frame, the tags can be identified one by one by a backtracking binary-tree searching method and the like. The method can greatly reduce collision phenomena in a multi-tag identification process and reduce times of information interaction between the tags and the reader-writer, and ensures high efficiency and security.

The invention discloses a remote I/O (input/output) control system of a Modbus fieldbus DI-16-route monitor, which is characterized in that a process of carrying out message transmission (which is implemented by using a fieldbus in an RTU (remote terminal unit) mode of a Modbus master/slave station protocol) between a master station and a slave station comprises the following steps of: sending a request message frame by a master station (6) U0; reading the request message frame by terminals J1 and U3, a transceiver drive communication circuit (5), a transceiver message control circuit (4) and a slave station (3) U1; acquiring on-off data by a subprogram of the U1; sending response message frames by the terminal J1, an on-off acquisition circuit (1), a photoncoupled isolating circuit (2) and the slave station (3) U1; and reading the response message frames by the transceiver message control circuit (4), the transceiver drive communication circuit (5), the terminal J1 and the master station (6) U0. The DI-16-route monitor is a slave station product for filed on-off acquisition, and provided with a PLC (programmable logical controller) product which is in a structure of integrating a power supply (with a visual diagnosis function and an anti-electromagnetic interference capability), a CPU (central processing unit) and I/O nodes, and compact in appearance, and easy to install, wiring and debug.

The invention provides a communication method and a communication device of a wireless local area network, an access point and a site. The communication method of the wireless local area network comprises the steps of generating a notice message frame which comprises first information used for indicating a transmission period of a communication resource distribution message frame, wherein the first information can instruct a site supporting an OFDMA function to periodically contend for an access channel in an OFDMA random access contention period; and sending the notice message frame. According to the method, the access point can inform the site of the transmission period of the communication resource distribution message frame, and then the site can define the transmitting time of the communication resource distribution message frame, and meanwhile the site can adopt an OFDMA withdrawing mechanism before transmitting UL OFDMA data, thus the sites are reduced in mutual conflicts when transmitting uplink data, and the use factor of the frequency spectrum is indirectly improved.

The invention discloses a wireless intelligent transducer and a method for implementing plug and play of the transducer. The intelligent transducer is a wireless intelligent transducer meeting IEEE (Institute of Electrical and Electronics Engineers) 1451.5 standards, and comprises a network capable application processor (NCAP) and a wireless transducer interface module (WTIM). The method for implementing plug and play of the transducer comprises the following steps: the NCAP sets a network number, selects a wireless transmission frequency channel, and starts a wireless network; the WTIM applies for adding the network, and the NCAP distributes the network number and a short network address; the NCAP and the WTIM start a network parameter storage and timed handshake mechanism; the NCAP loads a transducers electronic data sheet (TEDS), acquires transducer information of the WTIM and configures a transducer channel; and the NCAP starts the transducer channel, and the WTIM sends transducer measurement data. According to the method, the TEDS data are set by defining a communication message frame format; a protocol stack event processing process is started to monitor network structure change; network parameters are updated and stored in real time by adopting an off-chip data memory; the NCAP can timely and accurately identify that the WTIM is connected and disconnected with the network by means of short network address fields of a message frame by adopting the timed handshake mechanism under the condition that normal data transmission is not affected; and plug and play is implemented.

A method for measuring bus traffic on a controller area network (CAN) is described. Accordingly, in one embodiment, a digital oscilloscope acquires the CAN bus signal in form of a waveform in real-time. The waveform is converted into a bit stream and the bit steam analyzed to carry out various measurements in a CAN measurement system. The method can be used for continuous monitoring of bus traffic and measurements of various parameters related such as bus occupancy by a particular node. The acquired data may be analyzed for measuring bus occupancy by various types of CAN message frames. The user is presented with a data display and a graphical display of the measurements. Also, the user is allowed to feed identifier of a node to obtain measurements relating to that particular node.

With respect to a routing and a gateway (protocol conversion) in a network system, frame data can simply be generated even if a source node does not understand format specifications of all protocols, communication efficiency degradation caused by an enlargement of header information can be prevented as much as possible, and dealing with a new protocol can be simplified. A source node (data transmission device) transmits “common routing information”, which includes route information identifying all the nodes through which a message frame is routed from an own node to a destination node, while adding the common routing information on the message frame. Each relay node (data relay device) sequentially transfers the message frame while referring to the common routing information to perform identification of a destination, generation of a header, and update of the common routing information.

The invention discloses a configurable high-accuracy control system of time interval frame release Ethernet interface. The system comprises a frame data control interface module, a self-adaption muS level high-accuracy hardware sequential control module and a high-speed Ethernet communication interface module. The frame data control interface module can develop a data buffer in a self-adaption mode and store corresponding data information according to different data types of the frame data of a sample value or other normal frame data. The self-adaption muS level high-accuracy hardware sequential control module can generate a frame release sequential control mechanism in a self-adaption mode according to a message type, a message content and a high-accuracy sequential requirement which are configured by the system, and select a released contents of the frame data to send to an IP (Internet Protocol)-core-based MAC (Media Access Control) controller of the Ethernet according to the method of high-accuracy timer interruption. The method includes hardware timer interruption triggering, multi-tasking, hardware delay and message frame release. The high-speed Ethernet communication interface module releases Ethernet message frames according to the contents of the group packet of the MAC controller of the Ethernet in high speed. The system can solve the problem of larger jitter delay of the sending interval time of the sampling frame of an intelligent substation.

The invention discloses a management method for an intelligent device for realizing device capacity discovery in dynamic networking, which comprises the following steps that: when online, each devicesupporting the dynamic networking and a resource sharing method sends out device declaration message; each device in the dynamic networking monitors the declaration message of other devices; after receiving the declaration message of other devices, the device resolves the capacity information of other devices from the declaration message; and if the device receives application request of other devices in the dynamic networking, the capacities of the device and the request device are compared according to the capacity information of other devices to make adaptive operation. The on-line declaration message of each device adopts a multicast mode, and is transmitted through user datagram protocols or transmission control protocols. The method for realizing the device capacity discovery in thedynamic networking is realized based on a flashing standard protocol. Apart from the prior flashing device message frame and the field, the device is provided with device capacity information fields to realize the declaration and analysis of the device capacity.

A local transmission system for a vehicle comprises a number of stations which are connected to one another for exchanging messages via a databus, each message exhibiting a message frame with a predetermined structure. A data block to be transmitted is divided into N data packets which are successively transmitted as messages to the at least one receiver station, which individually acknowledges the reception of each of the messages, including the last such message of a data block, by sending an acknowledgement message. The transmitter station transmits a next successive message only if the acknowledgement message for the previous message has been received. Before sending each message, the transmitter station calculates an adjustable delay period, and only transmits such message only after the calculated delay period has elapsed.

The embodiment of the invention discloses a wireless communication method. The wireless communication method comprises a group aggregation media protocol data unit A-MPDU data frame, wherein the group A-MPDU data frame comprises a group first identification and a plurality of pieces of A-MPDU sub-frame data, and the group first identification is used for indicating the group A-MPDU data which the plurality of pieces of A-MPDU sub-frame data belong to; sending each group of the generated A-MPDU data frames to a data receiving end by means of sending one group of A-MPDU data frames at a preset frame interval time. The invention further discloses related equipment and a system. With the adoption of the wireless communication method, the related equipment and the system disclosed by the invention, the BA interaction times of the data receiving end and a data sending end is reduced, the sending quantity of BA message frames is greatly reduced, the technical problems of high fixed expenditure and low spectrum effective utilization rate due to the increase of the quantity of the BA message frames in the prior art are solved, the sending quantity of the BA message frames is effectively controlled, the fixed expenditure is greatly reduced, and the spectrum effective utilization rate is increased.

An apparatus and methods for expeditious handling of emergency message frames (e.g., 911 voice-over-Internet-Protocol [VoIP] frames, etc.) sent by a station in a wireless local-area network are disclosed. The illustrative embodiment increases the probability with which an emergency message frame is accorded the highest quality-of-service by establishing polling schedules that preferentially accommodate stations that transmit emergency message frames.

A message processing system 1 processes messages 5 such as emails being delivered across a network. A plurality of processing modules 10 are each operable to perform an action. A policy engine 11 causes the operation of processing modules 10 selectively in accordance with rules in a rules data store 12 and facts in the fact data store 13. The rules specifying the performance of actions in dependence on facts. The actions performed by the modules 10 include actions of analysing a message 5 and generating message facts specifying information about messages 5, such as the presence of unacceptable content. Thus the rules may specify actions dependant on such message facts. The actions include actions of controlling the delivery of a message 5 or other remedial action.

The invention discloses a CAN (controller area network) bus scheduling analysis and monitoring method, which includes the steps: a) acquiring information on a CAN bus, editing a message frame in a signal matrix and determining the property of messages in the message frame; b) acquiring the property of messages in a certain message frame signal matrix; c) judging whether Dm is smaller than Tm referring to the cycle of a certain message frame or not, optimizing scheduling for the messages in a busy cycle if the Dm is smaller than the Tm, judging whether the messages have transmission errors or not, optimizing the messages with the transmission errors, and directly executing a step d) if the Dm is not smaller than the Tm and the messages do not have the transmission errors; d) obtaining schedulability of the messages in the signal matrix and the utilization rate of the bus through the step c); and e) synchronously monitoring and analyzing the messages on the bus in real time by the aid of a monitoring module and automatically recording CAN message data by the aid of a log module during bus transmission of the signal matrix.

The present invention relates to an integrated circuit device for controlling LIN slave nodes based on a control signal transmitted by a LIN master control device. The IC device comprises a slave node circuit for processing the control signal when received in the form of a LIN message frame via a first data line terminal. The IC device also comprises a master node circuit for processing further control signals to be transmitted in the form of LIN message frames via a second data line terminal to the LIN slave nodes. The IC device also comprises a processing unit for controlling the LIN slave nodes based on the control signal by composing the further control signals.

A method and apparatus for jointly decoding a first and second message is disclosed. The signaling scenario illustrated by FIG. 1 and using the codeword properties defined herein, the various embodiments may combine multiple messages under the hypothesis that the value of a message portion corresponding any subsequent observed transmission is different. Accordingly a first buffer may store the first observed message frame (509) and a second buffer may sum the LLR's of subsequent observed frames (513).

In the embodiments disclosed, two decoding hypotheses are required only; a first where the two buffers are combined directly (513) and a second where the difference codeword bit LLR's of the first buffer (509) are inverted before combining with those of the second buffer (519). A maximum of N transmissions is allowed by the receiver (523), after which a decoding failure is declared.

The invention provides a wireless local area network communication method. The wireless local area network communication method includes the steps that a message frame is generated and contains function information of multiple correlation identifiers, and the function information of the multiple correlation identifiers represents the capacity for managing the allocated multiple correlation identifiers supported by a sender of the message frame; the message frame is sent. The invention further provides a set of corresponding wireless local area network communication equipment. Through the technical scheme, APs can be informed of the situation that the multiple correlation identifiers are supported by the STA so that the corresponding correlation identifiers can be allocated to all the APs establishing connection with the STA, and thus the management of the STA can be achieved conveniently.

A light emitting display is configured to reduce or prevent motion blur by shortening a time that a black frame is displayed between image frames. One embodiment includes display region, a data driver, a scan driver, and a controller. The display region displays frames of images according to a data signal and a scan signal. The data driver transmits data for displaying first frames and second (black) frames between the first frames. The scan driver includes first and second scan driving circuits for transmitting scan signals, and a switch unit for selectively coupling the first and second scan driving circuits. The scan driver transmits scan signals sequentially during the first frames and transmits scan signals to at least two of the scan lines concurrently by driving the first and second scan driving circuits in parallel during the second frames. The controller transmits a driving control signal to control the switch.