19 results about "Switched communication network" patented technology

A method for transmitting a bidirectional packet flow between two nodes of a communication network. One of the nodes transmits to the other node one initial single marked packet of the bidirectional packet flow. Each one of the nodes transmits to the other node unmarked packets, until one single marked packet is received from the other node. In response thereto, each node transmits to the other node one single marked packet of the bidirectional packet flow. This mechanism is continuously performed by the nodes, thereby causing the nodes to cyclically exchange single marked packets of the bidirectional packet flow. A measurement point placed on the path of the bidirectional packet flow may then detect the single marked packets transmitted in a certain direction and provide RTT measurements based on differences between their detection times.

A method for exchanging packets between two nodes of a packet switching communication network is disclosed. Each packet includes a tag field and a reflected tag field. Each node sets the value of the tag field in its outgoing packet for transmission to another node. This value alternates between two alternating tag values ​​every N outgoing packets. While receiving an incoming packet from another node, each node also sets the value of the reflected tag field of its outgoing packet according to the value of the tag field of the incoming packet. An observer placed between the two nodes can count packets with a tag field equal to any tag value and / or packets with a reflected tag field equal to any tag value, and use N and such counts to provide a packet loss measurement.

It is disclosed a method for transmitting through a packet-switched communication network a measurement result (for example, an RTT measurement result) available at a node of the network. The node applies to packets to be transmitted to a further node of the network a marking value, which is switchable between two alternative marking values. The node performs a first switching of the marking value, then waits a wait whose duration is equal to a value indicative of the measurement result available at the node itself, and then performs a second switching of the marking value. A probe placed on the path of the marked packets detects the first and second switching in the packets, and obtains a reading of the measurement result available at the node as the time lapsing between them.

This invention discloses a method and system for updating the root key when a device terminal switches communication networks. The method includes: a root key generation and storage device pre-stores an initial root key ciphertext in the quantum-safe device terminal; when the quantum-safe device terminal first connects to a communication network (i.e., connects to a first communication network), it performs root key authentication with the first network communication device, and encrypted communication can be established after successful authentication; when the quantum-safe device terminal changes its access network (i.e., connects to a second communication network), it needs to perform identity authentication and update the initial root key to obtain a root key usable in the second communication network. Based on the pre-stored root key ciphertext, this invention updates the original root key when the terminal deregisters from one communication network and connects to another independent communication network, enabling the terminal to complete network switching and subsequent encrypted communication without returning to the factory, significantly improving the flexibility and availability of the device.

The invention discloses a vehicle-mounted intelligent monitoring method and system based on multi-mode communication and behavior recognition, and relates to the related field of vehicle-mounted electronics and computer vision, the method adopts multi-mode communication to upload the acquired network signal intensity, vehicle driving state and cab real-time image and video data to the system, and the system is used for monitoring the behavior of the vehicle. Network signal strength changes are predicted according to historical data, and a multi-factor decision strategy is made to automatically switch communication networks; a pre-training target detection model adaptive to a night light environment is applied to position a face area of a driver, face key points are obtained through key point detection, dynamic fatigue characteristics of the driver are tracked in a cross-frame mode in combination with a target tracking algorithm, the eye state, the head posture and the yawning behavior of the driver are analyzed, and the fatigue index of the driver is calculated. And the vehicle driving safety is guaranteed through layered early warning. The problems that an existing vehicle-mounted intelligent monitoring system is single in communication mode, and a fatigue driving detection model embedded in the system cannot accurately position the face area of a driver are solved.

Adapter module (1, 15, 25, 39, 49) for information exchange between at least two participants of a communication network (31, 41) in the form of a bus (33, 43), wherein the adapter module (1, 15, 25, 39, 49) is configured to receive a first data record (3) from a first participant (11, 35, 45) of the communication network (31, 41) and to send a second data record (7) to a second participant (21, 37, 47) of the communication network (31, 41), wherein the adapter module (1, 15, 25, 39, 49) is configured to at least partially obtain the second data record (7) by applying a manipulation rule (5) to the first data record (3), wherein the second data set (7) consists of user data intended for the second participant (21, 37, 47), wherein the first data set (3) is contained in or foreseeable in at least one data frame, and wherein the second data set (7) is contained in or foreseeable in at least one data frame.

A method for enabling a round-trip packet loss measurement in a packet-switched communication network wherein a first node and a second node exchange packets comprising a packet loss field settable to an idle value or one or more measurement values. The first node performs a generation step whereby first packets having their set to a measurement value are transmitted to the second node. For each received first packet, the second node transmits back a second packet having its set to a measurement value. The first node then performs a reflection step whereby, for each received second packet, it transmits to the second node a respective third packet having its set to a measurement value. The time lapsing between start of the generation step and start of the reflection step has a predefined and substantially constant duration.

The invention belongs to the field of unmanned aerial vehicle formation control method design, and particularly relates to a four-rotor unmanned aerial vehicle formation anti-collision and obstacle avoidance control method which is suitable for switching a communication network. Through a target trajectory method, the unmanned aerial vehicle capable of communicating with the virtual navigator estimates the state of the navigator to obtain the target trajectory of the unmanned aerial vehicle, and other unmanned aerial vehicles obtain respective target trajectories through a communication topological structure. A potential energy function and a neural network fast terminal sliding mode control technology are utilized, self-adaptive neural network terminal sliding mode controllers are designed for the position subsystem and the attitude subsystem respectively, and on the premise that the stability of the system is guaranteed, the unmanned aerial vehicle rapidly flies to a formation preset position within finite time, rapidly forms a formation and keeps high tracking precision.

It is disclosed a method for transmitting through a packet-switched communication network a measurement result available at a network node. The node applies to packets to be transmitted a marking value, which is switchable between two alternative marking values. The node performs a first switching of the marking value, then waits a wait time whose duration is equal to a value indicative of the measurement result available at the node itself, and then performs a second switching of the marking value. The value indicative of the measurement result is calculated by multiplying the measurement result by a scaling factor inversely proportional to the packet transmission rate of the node. A probe placed on the path of the marked packets detects the first and second switching in the packets, and obtains a reading of the measurement result available at the node as the time lapsing between them, divided by the scaling factor.

An apparatus and associated method for processing packets transmitted in a packet-switched communication network includes a sampling module that identifies amongst the received packets a plurality of samples distributed in a statistically uniform way amongst at least two non-overlapping sample sequences. Each sample sequence is then subjected to at least one identification rule, thereby identifying in the sample sequence at least one sub-sequence of samples fulfilling the at least one identification rule. The identification rule comprises a condition on the value of at least one identification field of the packets. Then, at least one parameter indicative of a behavior of the at least one sub-sequence of samples is provided.

A method and apparatus for processing packets transmitted in a packet switched communication network are disclosed. A sampling module of the apparatus identifies in a received packet a plurality of samples distributed in a statistically uniform manner among at least two non-overlapping sample sequences. Each sample sequence is then subjected to at least one identification rule, thereby identifying in the sample sequence at least one sample sub-sequence satisfying the at least one identification rule. The identification rule comprises a condition on a value of at least one identification field of the packet. At least one parameter indicative of a behavior of the at least one sample sub-sequence is then provided.

It is disclosed a performance measurement application for a user communication device. The device runs at least one user application which exchanges at least one packet flow with a packet-switched communication network. When executed, the performance measurement application receives from an owner of the user communication device a request for performing a performance measurement. In response to such request, the performance measurement application activates a marking functionality comprising marking upstream packets of the packet flow to be measured and inducing the network node originating the downstream packets of the packet flow to be measured to mark them. The performance measurement application then provides performance parameter(s) relating to the marked upstream packets as transmitted and / or the marked downstream packets as received and, based on such parameter(s), provides a performance measurement. The measurement results are then shared with a measurement management server.

The invention discloses a data-driven prediction multi-mobile robot inclusion control method and system. The method comprises the following steps: acquiring position information of mobile robots; constructing a dynamic linearization data model, designing a multi-step prediction equation to estimate a future trajectory, minimizing a tracking error and a control increment by using a criterion function, deriving a control law, and combining a pseudo partial derivative matrix online estimation and parameter prediction algorithm to realize model-free adaptive prediction control; constructing a dynamic switching communication network based on the directed topological graph; based on a designed model-free adaptive predictive control model, an inclusion control technology is introduced, so that all followers finally enter and keep moving in a convex hull formed by a leader. The multi-robot system gets rid of dependence on a mathematical model, the controller is designed and analyzed only by using input / output data, all robots can finally enter and keep moving in a convex hull formed by a leader, the cost is effectively reduced, and the applicability of the system is improved.

The present invention relates to a method, a device and a system for communicating files in a switched communication network of a vehicle, the switched communication network comprising a plurality of computers (311, 312, 313) and a plurality of switches (301, 302). For this purpose, a first switch (301) receives a first data frame (F1) from a first computer (311) connected to the first switch (301). The first switch (301) records a first item of information representative of a time of reception of the first data frame (F1) by the first switch (301) in a first file (T1). The first switch (301) transmits the first file (T1) to an external device (11) in the switched communication network via a determined port, called the instrument port (3011) of the first switch (301). Figure for abstract: Figure 3

It is disclosed a method for exchanging packets between a first and second nodes of a packet-switched network. Each packet comprises two fields PLG and PLR settable to an idle value or measurement value. The first node transmits to the second node first packets having their PLG set to measurement value (generation). Upon reception of each first packet, the second node transmits back to the first node a second packet having its PLG set to measurement value. Upon reception of each second packet, the first node transmits to the second node a third packet having its PLR set to measurement value (reflection). A packet loss measurement may be calculated as a difference between number of first packets and number of third packets. Since two fields PLG, PLR are used, the first node may start a new generation step before end of reflection. This results in high measurement throughput (100% theoretically).

It is disclosed a method for performing a RTT measurement on a bidirectional packet flow transmitted between two nodes of a packet-switched communication network. Each node applies a respective marking value to its outgoing packets, and switches outgoing packet does not exceed a predefined time threshold. An intermediate measurement point may provide an RTT measurement as a time lapsing between two consecutive switching of the marking value in the packets transmitted in a certain direction.

The present invention relates to a method, a device and a system for communicating data in a switched communication network of a vehicle, the switched communication network comprising a plurality of computers (311, 312, 313) and a plurality of switches (301, 302), each switch comprising a plurality of communication ports, a communication port corresponding to a so-called instrument port (3010, 3020). For this purpose, a first switch (301) receives a first data frame (F1) from a first computer (311) connected to the first switch (301). The first switch (301) generates a copy of the first data frame (F1) by adding first data representative of a time stamp (t1) in the first data frame (F1) to obtain the copy. Figure for abstract: Figure 3

Methods and systems are disclosed for providing performance measurements in a packet-switched communication network, in which a performance measurement application run by a user communication device monitors performance of a packet flow exchanged by a user application run by the user communication device with the packet-switched communication network. Such monitoring includes providing values of performance parameters related to the packet flow. If a fault condition affecting the packet flow is detected based on the values of the performance parameters provided by the performance measurement application, further monitoring of the performance of the packet flow is activated by one or more measurement points located within the packet-switched communication network on a path of the packet flow. Such further monitoring includes providing values of further performance parameters related to the packet flow.

A method is disclosed for enabling a performance measurement on a multipoint packet flow carrying live traffic through a packet switched communication network. Each packet comprises a marking bit, which before its transmission is set to either a first value indicating that the packet is to be subjected to a sample performance measurement, or a second value indicating that the packet is not to be subjected to a sample performance measurement. A measurement point placed on the path of the packet reads the value of its marking bit and: if it is set to the first value, it generates a sample performance parameter relating to the packet; otherwise, it updates a cumulative performance parameter relating to the multipoint packet flow as a whole. A sample measurement based on the sample performance parameter and / or a multipoint performance measurement based on the cumulative performance parameter may then be performed.