9 results about "Switched communication network" patented technology

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.

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.

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.

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.

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.