5 results about "Transmission Control Protocol" patented technology

The invention discloses a one-card control system and a one-card control method of a mobile phone Bluetooth swiping card. The control system comprises a one-card control center, an elevator management module, a mobile phone Bluetooth card reader, an input and output module; the elevator management module is in communication connection with the mobile phone Bluetooth card reader; a card number transmitted from the mobile phone Bluetooth card reader is processed in real time to judge whether the received card number is effective, and the input and output module carries out corresponding output according to permission control registered by the card number, or floor permission information stored on the mobile phone card of a user is directly read, and the input and output module carries out corresponding output according to the control of the permission information. The third-party linkage communication interface of the elevator management module or the one-card control center is respectively connected with an intercommunication access control system and a parking lot management system through TCP/IP (Transmission Control Protocol/Internet Protocol) for linkage so as to realize seamless integration among systems. A mobile phone Bluetooth function is used for replacing a control method for starting an elevator by using a traditional card, so that the problem that the control for the elevator is not flexible through passive RFID (Radio Frequency Identification) and active RFID originally is solved; meanwhile, the third-party linkage communication interface or the one-card control center achieves linkage with intercommunication access control, parking lots or other third parties to realize integrated application of multiple systems, so that the degree of automation is further improved.

The invention discloses a multi-path transmission control protocol data packet scheduling method based on deep reinforcement learning. In a multi-path transmission control protocol (MPTCP), a data packet scheduling process is converted into a Markov decision process by setting a periodic scheduling mechanism, a data packet scheduling strategy of the MPTCP is represented by a neural network through deep reinforcement learning, and an optimal data packet scheduling strategy under various network environments is learned. The problem that heuristic MPTCP data packet scheduling cannot adapt to complex and diverse dynamic network environments, and consequently MPTCP performance is reduced is fundamentally solved. According to the method, an Actor-Critic reinforcement learning framework is used, a deep reinforcement learning algorithm based on strategy gradient is adopted, and modeling and learning are directly carried out on an MPTCP data packet scheduling strategy, so that strategy optimization efficiency is improved, and training of an MPTCP data packet scheduling strategy neural network is accelerated.

A method for maintaining transmission control protocol (TCP) connection and a computer system are provided. The method is adapted to a computer system having a network card and a processor, wherein the processor executes an operating system. In the method, a first TCP connection with a remote server is first established via the network card. Then, after the operating system enters a power saving mode, a wake-up packet transmitted by the remote server through the first TCP connection is received to wake the operating system. The operating system resets the retransmission time of the remote server transmitting the wake-up packet when resuming a normal operation mode.

A multi-cast download method for downloading an image file is applicable to downloading the image file from an image file server to a computer. The multi-cast download method includes the steps of establishing a wire network connection and a wireless network connection in the computer, in which the wire network connection connects the computer and the image file server; and simultaneously performing a retransmitted packet receiving process and the following steps. The image file is downloaded from the image file server to the computer in a multicast manner by using the wire network connection. When a lost packet is detected, a packet retransmitting request corresponding to the lost packet is sent by using the wireless network connection and Transmission Control Protocol (TIC).

The invention discloses a universal programmable logic controller (PLC) communication module for a field bus, which is characterized in that a first communication interface connected with a Modbus transmission control protocol (TCP) slave station communication stack is a Modbus TCP interface; a second communication interface and a third communication interface which are connected with a Modbus remote terminal unit (RTU) master station communication stack are a Modbus RTU interface I and a Modbus RTU interface 2 respectively; a fourth communication interface connected with a Profibus master station communication stack is a Profibus special bus interface; a fifth communication interface connected with a Can master station communication stack is a Can special bus interface; and a sixth configuration interface connected with a transmission control protocol-internet protocol (TCP-IP) communication stack is used for controlling the working states of the second communication interface, the third communication interface, the fourth communication interface and the fifth communication interface. The universal PLC communication module for the field bus is capable of realizing the simultaneous data interaction with various types of bus equipment according to configurations.