36results about How to "Guaranteed reliable transmission" patented technology

The invention discloses an optical fiber distribution combination comprising an optical fiber distribution module and an optical fiber plug, wherein the optical fiber distribution module comprises a distribution module structure body, an adapter fixed on the distribution module structure body and a signal port plug which is fixedly arranged on the distribution structure body and used for receivingan identification signal; the optical fiber plug comprises a connecting head which is used for being matched with an optical fiber interface of the adapter and transmitting an optical signal and an identification plug which is arranged at one side of the connecting head convexly, wherein the identification plug is combined with the signal port plug when the connecting head is inserted in the adapter. The invention can achieve the intelligent optical fiber distribution function based on ID and ensure the reliable transmission of a signal of a chip. In addition, the complexity of an electrically connected structure of the adapter and the optical fiber plug is lowered, the structures of the adapter and the optical fiber plug are simplified, the manufacture cost of the whole optical fiber distribution combination is lowered, and the convenient maintenance and debugging is achieved.

A one-way coupling device for the feedback-free transmission of data from the first network with high security requirements into a second network with low security requirements, containing a request unit, an eavesdropping unit and a receiving unit, wherein the request unit is formed so as to provide a first communication link within the first network to at least one device and, moreover, to request first data from the at least one device and then to transmit the first data via a second communication link on a separate line loop of the request unit, and the eavesdropping unit, which is formed so as to eavesdrop on data on the separate line loop and to transmit data to a receiving unit which is arranged in the second network. Also, a corresponding request unit, a corresponding method and a corresponding computer program product is also provided.

The invention provides a message transmission method for realizing the message transmission from the internal network to the external network through a queue. When a message is sent by using the method, when the message to be transmitted is placed into the transmission queue, a sending end detects that the message to be transmitted is put into the transmission queue, the message to be transmittedis read, and then the read message is sent to a receiving end through the pre-built transmission queue. The queue serves as a carrier for temporarily storing the message to-be-transmitted, so that thequeue can be resided on a memory or a magnetic disk. Therefore, when the sending end sends the read message to the receiving end, the message to be transmitted in the transmission queue is not deleted. The sending end determines whether the receiving end receives the message according to the feedback message returned by the receiving end, when the receiving end does not receive the message, the message to be transmitted is read again, and the re-read message is sent to the receiving end, so that the reliability transmission of the message is guaranteed.

The invention discloses a transmission method of system parameters in a cognitive radio communication system, and belongs to the technical field of wireless communication. The method includes the steps that a transmitting party stacks main channel information and auxiliary channel information (system information) together on frequency domain information stacking on the basis of an OFDM technology, and transmits the information after IFFT and cyclic prefix adding are carried out on the information; after cyclic prefix removal and FFT are carried out on the received information, a receiving party carries out decoding to obtain the main information, then removes the main information from the received information, and then demodulates out the auxiliary information, wherein the auxiliary information is encoded according to a kasami sequence; on the premise of ensuring reliable transmission of original service information (a main channel), the transmission technology on the frequency domain information stacking (an auxiliary channel) achieves transmission of the system parameters of a cognitive network, and can adapt to dynamic frequency spectrum switchover, and the design complexity is reduced.

The invention relates to a wireless link backup scheme based on an ad-hoc network. The implementation principle is as follows: a multi-hop network is adopted, the wireless ad-hoc network is adopted, any wireless device node can serve as a base station and a router at the same time, each node in the network can send and receive signals, each node can directly communicate with one or more peer nodes, a remote control communication scheme of E1 and a kilomega port based on a wireless ad-hoc network device is achieved, the wiring demand among the nodes is removed by a wireless Mesh network, but a redundancy mechanism and a re-routing function provided by a distributed network are still required, the features of automatic discovery and fast rerouting of the wireless Mesh technology is utilized, the Mesh network also allows the terminal to quickly switch during high-speed moving in the network, the highly flexibly ad-hoc network topology not only supports point to point and point to multipoint, but also makes it possible for multipoint to multipoint centerless ad hoc network.

The invention relates to a data redundancy sending method in an industrial wireless network, which comprises the steps of: detecting key degree Q of data in a star network firstly, realizing redundancy sending of key data, then determining redundancy rate N of data sending according to importance K of transmission data of field devices and redundancy routing table number stored by a router, and finally realizing N redundancy sending of the data in an MESH network. The method not only realizes redundancy sending of key data, avoids communication resource waste caused by sending common data repeatedly, prevents data loss and alteration, and provides guarantee for reliable transmission of the whole network data, but also solves the problem of data delay caused by long data incapable of being sent over in a time slot.

The invention provides a method for solving soft information in a 16APSK high-order modulation mode, and aims to realize efficient decoding in the 16APSK modulation mode and fully improve the utilization rate of a frequency spectrum. The method is implemented through the technical scheme that the method comprises the steps: evenly distributing constellation diagrams in a 16APSK modulation mode in coordinate system planes of different areas, carrying out mean value estimation according to 16APSK demodulation signals, solving soft information in the different areas, and completing the frame synchronization; calculating a boundary threshold value of an inner ring and an outer ring formed by concentric circles of a unit coordinate system of a constellation diagram region division diagram according to a statistical value, and demodulating a demodulation signal belonging to a certain region in 16 different regions in the constellation diagram; calculating the soft output demodulation information of a high-order modulation 16APSK signal, carrying out the LDPC decoding in combination with a density parity check code LDPC high-speed decoding mode, verifying the code words received by a receiving end through a corresponding supervision relation, and finding and correcting the errors introduced in transmission, so the LDPC decoding of mass data transmission in the 16APSK modulation mode is achieved.

The invention discloses a train running auxiliary system based on train-ground video transmission. An auxiliary train protection system comprises a fixed long-distance monitoring camera arranged on a track or an existing video monitoring system and a distribution and forwarding server as well as a dedicated video display and a video communication terminal which are arranged on a train cab. The system is characterized in that a camera monitoring video is transmitted to the dedicated distribution and forwarding server; the dedicated video display and the video communication terminal are arranged on the train cab, video image information is called from the dedicated distribution and forwarding server through a high-speed wireless network and is displayed on the video display, and a train can call a monitoring video within a certain distance range in front of a running direction in a running process according to own position information.

The invention provides a data monitoring system and method. The data monitoring system is operated on a baseboard management controller, the baseboard management controller is used for monitoring at least one server, and the baseboard management controller is used for receiving data transmitted through an I2C bus from the server and being connected with the server through an input/output expander; when reception of information transmitted by the server is completed, an ACK signal is not immediately replied by the baseboard management controller to the server so as to express that the reception of the information is completed, but the situation whether the received information is right and complete or not is verified, and when the received information is verified to be right and complete, the ACK signal is replied, otherwise an interrupt signal is transmitted to the server so as to continuously transmit the corresponding information, so that the reliable transmission of the data between the server and the baseboard management controller is ensured.

The invention discloses an Internet of Things field video monitoring system based on low power consumption. The system comprises a video acquisition end, a video server end and a video publishing server, the video acquisition end is connected with the video server end; the video server end is connected with the video publishing server. The system is novel in structural design, is based on a lightweight application layer protocol of a UDP protocol, transmits video data through increasing the data transmission time and then optimizes the display effect of the video through the processing of theserver side, meets the video monitoring application of a low-change-rate scene, and can improve the field video monitoring efficiency.

The invention discloses a communication method based on a hybrid automatic repeat request (HARQ) assisted multi-RIS system. The communication method comprises the following steps: S1, designing a signal transmission model of a hybrid automatic repeat request technology assisted reconfigurable intelligent surface; S2, deducing the outage probability of a signal transmission model according to the probability of an event of which the mutual information accumulated at the receiving node is smaller than the transmission rate R; S3, analyzing phase shift optimization, modulation and coding gain and diversity order by utilizing the progressive behavior of the outage probability under a high signal-to-noise ratio and through a progressive result; and S4, performing wireless resource configuration by using the analysis result obtained in the S3. According to the method, the influence of setting of related parameters of the system on the interruption performance is analyzed by using the result obtained in the step S3, so that wireless resource configuration is better carried out, and reliable transmission is ensured while the spectrum efficiency is improved.

The embodiment of the invention discloses a networking method of a monitoring ring network and a networking device thereof. According to the networking method, networking of a monitoring ring network system is realized through one ring network switch and multiple common switches, and transmission of a multicast/broadcast message of which the source address is a gateway equipment MAC address is timely performed through an auxiliary port in case of disconnection so that the common switches influenced by disconnection are enabled to transmit monitoring data flow to the auxiliary port, and thus loss of the monitoring data flow in case of disconnection of the loop can be avoided. According to the networking method, reliable transmission of the monitoring data flow can be guaranteed through one ring network switch, and networking of the monitoring ring network system does not need to be performed by completely using the ring network switches so that the low-cost common switches and the existing common switches of users are enabled to be compatible by the monitoring ring network system, and waste of existing equipment can be avoided. Meanwhile, unification of a ring network protocol can also be guaranteed by the networking structure having only one ring network switch so that the networking difficulty and cost of the monitoring ring network system can be reduced.

The invention discloses a protective transmission method of P2P (Picocell to Picocell) switching commands in a small cell network, and belongs to the technical field of P2P switching in a 3GPPLTE-A system under the environment of small cell network. The method comprises the following steps: firstly, a source cell Picocell and a target switching cell Picocell send switching commands to UE and a service cell Macrocell for switching backups of related information; the service cell Macrocell conducting processing after receiving the switching commands; then the UE determines the information of the target switching cell and related information of the source cell according to the received switching commands to finish the switching preparation and realization; if the UE cannot correctly receive correct related information of the switching commands, information is fed back to the service cell Macrocell for requiring retransmission until the maximal retransmission times is achieved. The method of the invention can well guarantee the reliable transmission of the switching commands, and can well improve the transmission spectrum effectiveness and the channel resource utilization rate of the switching commands, so that the failed switching caused by wrong transmission of the switching commands under the complex small cell network environment is avoided.