108results about How to "Solve packet loss" patented technology

The invention discloses method and device for controlling congestion of an Ethernet. The method comprises the following steps of: closing an ingress port of core network equipment with the function of congestion detection to trigger a flow control PFC (Power Factor Correction) mechanism based on priority through a threshold; detecting whether a message forwarded by the ingress port is a CNM (Congestion Notification Message) or not; generating a PFC message according to the CNM if the message forwarded by the ingress port is the CNM; and forwarding the CNM through the ingress port and notifying the opposite-end equipment of suspending the data transfer of a corresponding queue according to the PFC message. With the technical scheme of the invention, the congestion problem can be quickly and effectively solved fundamentally.

The invention discloses a confidential express method. The method comprises the following steps: establishing an express information processing center; encrypting and saving the address information and receiving password of a recipient and generating a key code through a server; sending the key code to an initiator through the recipient; sending the key code, the goods information and the initiator identification to the server through the initiator for encrypting, saving and generating a bill number; sending the goods together with the bill number; reading the bill number and checking the goods information by an undertaking worker; transporting the goods to a sorting place to enter the transfer stage after checking; reading out the bill number by a sorting worker; sorting the goods according to a targeted city; transferring to the next station until arriving at the delivery station of the targeted city; reading the bill number by an express delivery worker to obtain the receiving address and contact mode; delivering the goods to the recipient; sending the receiving password to the server to verify to obtain the goods by the recipient. With the adoption of the confidential express method, the information of the recipient and the initiator can be effectively prevented from leaking; in addition, a complete system of signing after receiving is provided. The invention also discloses a confidential express system.

The invention discloses a roaming link switching method, a mobile terminal, a network module and a storage medium. The roaming link switching method comprises the following steps: searching availablewireless access points in the current environment to obtain to-be-connected wireless access points; separately establishing links with the to-be-connected wireless access points, selecting a link fromthe links to serve as a main link to perform data communication, and using the rest links as standby links; then when it is detected that the communication quality of the main link does not satisfy preset conditions according to the main link and the standby links and that roaming link switching needs to be executed, selecting a link from the standby links, and switching the selected link into the main link to perform the data communication. Therefore, the problems of link interruption and packet loss in the roaming link switching process of the existing wireless local area network system aresolved, the data communication of a user terminal is not interrupted in the roaming link switching process, reliable network service is provided for the user, and the network experience of the user is improved.

The invention relates to a path detection method and apparatus. The method comprises the following steps: when a first network device learns FRR (Fast Reroute) reaching a second network device, sending a first BFD message to the second network device so as to establish a first BFD session between the first network device and the second network device, wherein the first BFD message comprises identification information, and the identification information is used for triggering the second network device to send a second BFD message so as to establish a second BFD session between the second network device and the first network device; and detecting a main path between the first network device and the second network device by the first network device based on the first BFD session and the second BFD session. According to the path detection method and apparatus disclosed by various aspects of the invention, the following problem is solved: when a non direct connection path is faulty, fast switch cannot be achieved, resulting in a large amount of packet loss. Moreover, the fault of the non direct connection path is detected quickly without changing the networking configuration, the non direct connection path is switched to a standby path, and the detection manner is simple and flexible.

The invention provides an IP (Internet Protocol) header compression method and apparatus, user equipment and a base station, relates to the field of communication, and solves the problem the conventional IP header compression mechanism cannot solve a problem of large header expense on a default bearer. The method comprises steps of determining whether to carry out IP header compression of an IP message of currently-operating data traffic according to service features of the currently-operating data traffic; sending an IP header compression activation request to a base station when carrying out IP header compression of the IP message of the currently-operating data traffic; receiving an IP header compression activation command returned by the base station; compressing an IP message meeting IP header compression starting conditions and sending the compressed IP message to the base station according to the IP header compression activation command; or decompressing the IP message subjected to IP header compression received by the base station and sending the decompressed IP message to a non-access layer of user equipment The scheme of the invention is suitable for IP messages on the default bearer, and the transmission efficiency is improved.

The invention relates to a method for realizing positioning based on a Beidou short message transmission differential signal. The method is provided in order to improve the applicability of satellite differential positioning, and is used to perform differential positioning in an area with neither network base station nor mobile communication base station. The method comprises the following steps: a reference station terminal gets a differential correction number according to a received satellite signal and the coordinate of a reference station, and stores the differential correction number in an internal memory of the reference station terminal; a moving station terminal generates a differential data request including differential start time and differential frequency, and sends the differential data request to the reference station terminal; the reference station terminal sends corresponding differential data to a reference station coding module after receiving the differential data request sent by the moving station terminal; the reference station terminal sends a single piece of differential data information through a Beidou short message, and multiple cards send differential data information in turn to meet the requirement of the moving station terminal for positioning frequency; and the moving station terminal receives differential data of multiple epochs, uses the data to fit a pseudo-range differential correction number through Chebyshev polynomial interpolation, and uses a correction number obtained by extrapolation to perform differential positioning.

The invention discloses a video monitor system and a method for forward correcting thereof. The method comprises the followings steps of: sending a conversation request to a monitoring platform by a monitoring front end, establishing a corresponding conversation, performing FEC correcting coding on a media code stream by the monitoring front end, sending the coded FEC correcting code stream and a source media code stream in a same passage to the monitoring platform, dividing the received code stream into the source media code stream and the FEC correcting code stream by the monitoring platform, and if a media packet is lost, recovering the lost media packet in the source media code stream by the FEC correcting code stream. The method of the invention solves the problem that the network packet is always lost due to the limited uplink bandwidth between the monitoring front end and the monitoring platform and lowers the use cost.

The invention discloses a method, a device and a system for migration of virtual machines. The method includes: using a switcher to detect whether the quantity of the virtual machines connected with a first virtual machine hosting server to be smaller than a first threshold value or not; and when the quantity of the virtual machines is smaller than the first threshold value, using the switcher to request a virtual machine management server to migrate the virtual machines connected with the first virtual machine hosting server to other virtual machine hosting servers. By the aid of the method, the device and the system, the problem of packet loss possibly caused by a virtual machine migration mode in the related technology is solved, and services are guaranteed to be smoothly performed while energy consumption of data center network equipment is reduced.

The invention pertains to a data transmission method in the optical network communication technology. The invention organically combines optical circuit switching (OCS) and optical burst switching (OBS) based on the original physical topological network, reserves wavelength in each physical link to establish an overflow transmission light path, transmits the discarded data packets of the original OBS due to booking collision into the light path to transmit continuously, accordingly resolving the problem of packet loss due to one time booking collision; most of the data packets in the network operation adopts an OCS mode transmission, and adopts an OBS mode overflow transmission light path to transmit the data packets to destination nodes when the data conveying capacity has a high a burst performance; and can switch back to the OCS mode transmission when the OCS light path is smooth, accordingly can flexibly adjust the transmission modes according to the current state of network and significantly reduce the packet loss rate. The present invention thus not only has high efficiency of OCS but also has flexibility of OBS, and has features of strong transmission capability and adaptability to burst data streams, rapid network transmission, high reliability, no additional optical devices and the like.

The embodiment of the invention provides a wireless network switching method and device and relates to the field of communication. The packet loss problem when a terminal carries out switching can besolved. The method comprises the steps that a switching device obtains the distance between the terminal and a current access point, thereby determining change trend of the distance between the terminal and the current access point; and if the switching device determines a target access point to which the terminal is about to be switched according to a corresponding relationship between the changetrend and neighbor access points of the current access point, the switching device switches the terminal from the current access point to the target access point. The embodiment of the invention is applied to a scene in which the terminal carries out switching and roaming within an expressway WiFi network.

The invention provides a video transmission method and device, and the method and device are used for a client, and the method comprises the steps: receiving video frames transmitted by a server, wherein each video frame comprises a plurality of data packages; analyzing the received video frame, and sending a first retransmission request to a server under the condition of determining that the video frame is lost, so as to enable the server to resend a lost data packet; and if it is determined that the first retransmission request fails, sending a second retransmission request to a server, so as to enable the server to send a complete video frame again after the video frame is sent, thereby realizing dual assurance for packet loss retransmission, solving the problem of packet loss and reducing network delay.

The invention discloses a cross-layer congestion control method based on a game theory in a wireless Mesh network, which belongs to the technical field of wireless network communications. The congestion control method provided by the invention is implemented mainly by the following steps of: carrying out a non-cooperative game control algorithm about available resource at a service flow source node MAC layer on a wireless link; analyzing and representing buffer occupation state of the MAC layer to obtain a balance rate accordant to the current available resource; adding an interactive field for performing cross-layer communication between the MAC layer and a transmission layer into a data packet head; feeding back the balance rate obtained by the MAC layer to the transmission layer through a cross-layer mechanism; and dynamically adjusting a data transmitting rate of next time according to the balance rate by the transmission layer. The cross-layer congestion control method provided by the invention is simple, quick, easy to implement and effective in improving service flow rate, throughput and end user utility.

The invention provides a strategy routing processing method, a message forwarding method, and a strategy routing processing device and a message forwarding device. The strategy routing processing method comprises the steps of reporting detected interface failure information to a protocol layer, wherein the interface failure information is used for instructing the protocol layer to update the state of a strategy routing forwarding table to be invalid; and setting the strategy routing forwarding table corresponding to a failed interface to be invalid. According to the method and the device provided by the invention, the problem of packet loss caused by a forwarding table maintenance mode in related technologies is solved, and the possibility of packet loss is reduced.

The invention discloses a rate control method. In the method, a control device receives a connection establishment request of a terminal, and the connection establishment request is used for establishing connection for data transmission of the terminal; the control device sends rate control time management information to the data sending device, wherein the time management information is used forthe data sending device to perform rate control on the data sent on the connection, the time management information comprises starting time indication information of a rate control time unit for performing rate control, and the starting time indication information is used for indicating the starting time of the rate control time unit. By means of the scheme, the problem that in the prior art, whenthe data sending equipment sends the reasonable number of data through the rate control information, packet loss or delay processing still occurs is solved.

The invention discloses a method and a device for transmitting multimedia data, and the method comprises the following steps: transmitting a multimedia data packet to a receiving end by a transmittingend and reducing a transmitting window; continuously transmitting multimedia data packets to the receiving end by the transmitting end; stopping transmitting the multimedia data packets to the receiving end when judging that the transmitting window is reduced to zero; reducing a receiving window after receiving the multimedia data packets transmitted by the transmitting end by the receiving end;and processing the received multimedia data packets. By adopting the invention, the problem of packet losing caused by the condition that video speed fluctuation exceeds limited bandwidth can be solved by bandwidth control, multimedia data can be evenly transmitted while images are free of garbled screen and audio output has no noise.

The invention discloses a packet reissuing method and system for group communication, and the method comprises the steps: sending a message which is used for suggesting the establishment of a unicastbearer to a server when user equipment detects the loss of a data packet of the group communication, the unicast bearer being used for reissuing the lost data packet, and the message carrying corresponding data packet loss information; enabling the server to establish a unicast bearer for the user equipment according to the message; and enbaling the server to utilize the unicast bearer to retransmit a lost data packet indicated by the data packet loss information to the user equipment. By adopting the method and the device, the packet loss problem of group communication can be effectively solved, and the data integrity of the group communication is ensured.

The invention relates to a lose-tolerable file transfer control method applicable to a space communication system, comprising the following steps: 1) data knitting process: (1.1) selecting a step d; (1.2) selecting d data blocks randomly from N original data blocks and recording as S'1, S'2,..., S'd; (1.3) carrying out bitwise XOR operation on the d data blocks; 2) data unknitting process: (2.1) finding a data block with step d=1, receiving more data if the received data blocks have no data block with d=1, till receiving the data block with d=1; (2.2) restoring Sk, and leading to Sk=tn; (2.3) finding other received and Sk-related data blocks ti (i is not equal to n) according to a generated matrix; (2.4) deleting all 'edges' connected with Sk; (2.5) if all Sies are restored, obtaining an original file; and otherwise back to step (2.1). The lose-tolerable file transfer control method can effectively avoid packet loss of link, has strong transmission reliability, shortens the time delay of file transfer, and increases throughput.

The invention provides a method for adjusting the working speed of convergence switch interfaces. The method is applied to a video management server. The method comprises the steps that A, an SNMP is used for inquiring an MAC address table of a convergence switch, and the MAC addresses learned on the interfaces connected to a switch of the convergence switch are acquired; B, the speeds of all the interfaces of the convergence switch are calculated according to the real-time condition flow and storage flow information sent by all monitoring front end devices in current local records combined with the MAC address information learned on all the interfaces of the convergence switch; C, the working speed of the interfaces with the speed smaller than a preset threshold value is adjusted to be 100 M, and the working speed of the interfaces with the speed larger than or equal to the preset threshold value is adjusted to be 1000 M. According to the scheme, the video management server is used for dynamically adjusting the speeds of the interfaces of the convergence switch according to the code stream needing to be borne in a current network and insisting on the applicable principle, so that the problem that the bandwidth of the interfaces of the convergence switch can be insufficient, and packet loss happens is solved.

The invention discloses a wireless networking system and method of working parameters of rail vehicle equipment or mechanism. Short-distance wireless communication is realized based on an ISM (Industrial Scientific Medical) frequency band; a star-like hybrid networking system is formed by using data acqusition node equipment, carriage gathering node equipment and vehicle gateway node equipment; the problems such as packet loss and wireless transmission interruption of data transmission in a carriage are solved; a stable data transmission channel is provided; the system and the method are suitable for transmission of large data volume in a complex environment in an urban rail vehicle and have good application prospect.

The invention discloses a VM migration method, a VM migration system and a server. The method comprises the following steps: a centralized server determines first configuration change information of a CVLAN used by a VM on a Bridge Link where a source RB is located before and after VM migration and determines second configuration change information of the CVLAN used by the VM on a Bridge Link where a destination RB is located before and after VM migration; the centralized server determines a pruning tree corresponding to the CVLAN used by the VM according to the first configuration change information and the second configuration change information; and the centralized server sends the pruning tree to the RBs through a network constituted by control ports provided by the RBs. The problem that a data plane message in a TRILL network may suffer from packet loss due to lagging distribution tree pruning can be solved.

The invention provides a data transmission method and device. The data transmission method comprises the steps of determining first data sent by a first network element are not received from a first link within first predetermined time, wherein the first link is further used for sending second data to the first network element; using a second link to send the second data; and after using the second link to send the second data, stopping using the first link to send the second data. The data transmission method provided by the invention solves the problem of data packet dropout during the process of link switching in the related technology, thereby reaching an effect of data complete transmission in the process of link switching.

The invention provides a method for carrying out local linear interpolation and prediction based on real-time positioning trajectory data. The method comprises the following steps: 1, reading a pieceof real-time trajectory calculation data; 2, if the solution in the step 1 fails or interpolation prediction needs to be carried out and the number of historical solution data is more than 5, turningto the step 3, otherwise, turning to the step 8; 3, taking out six pieces of latest solved historical track solving data; 4, resolving data of the six historical tracks in the step 3, resolving a linear coefficient, and obtaining a coefficient matrix; 5, carrying out matrix multiplication by using the last five data of the six pieces of data extracted in the step 3 and the coefficient matrix obtained in the step 4 to predict the next coordinate; 6, optimizing the prediction data and the historical trajectory calculation data; 7, adding newly predicted data into a historical trajectory calculation data set after filtering; and 8, carrying out positioning data calculation of the next round, and turning to the step 1.

The embodiment of the invention provides an Internet of Things equipment management method and device, a medium and electronic equipment. The management method comprises the following steps: generating a reported value storage space and an expected value storage space for the Internet of Things equipment; receiving equipment actual configuration data reported by the Internet of Things equipment, and storing the equipment actual configuration data in the reported value storage space; receiving a configuration instruction containing expected configuration data sent by the control end of the Internet of Things equipment, and storing the expected configuration data in the expected value storage space; and if the configuration data stored in the expected value storage space is different from the configuration data stored in the reported value storage space, synchronizing the expected configuration data stored in the expected value storage space to the Internet of Things equipment. According to the technical scheme of the embodiment of the invention, decoupling between the Internet of Things equipment and the control end thereof can be realized, and the management efficiency of the Internet of Things equipment can be improved.

The invention relates to a data forwarding method and system, and particularly relates to the technical field of network communication. The method comprises the following steps: receiving a first link notification sent by a target leaf switch, wherein the first link notification comprises a first sharing coefficient and a first destination network address; when a target equivalent path of which a destination network address is a first destination network address exists in a local routing table, adjusting a first equivalent routing weight of the target equivalent path according to the first sharing coefficient, and the ridge switch realizes data forwarding in the target equivalent path according to the adjusted second equivalent routing weight. According to the scheme, each ridge switch can adjust the equivalent routing weight of each equivalent path according to the first sharing coefficient, so that the data flow in the hotspot path is reduced, the data flow does not need to be subjected to routing processing again, and the efficiency of solving the problem of packet loss or time delay on the hotspot path is improved.

The invention discloses data transmitting / receiving devices and a communication system based on 3G multi-card binding. The data transmitting device comprises a first data receiving module for receiving external data, a data encapsulating module for conducting data encapsulation on the received external data, and more than two 3G network card modules, wherein a plurality of 3G network card modules are commonly connected with a 3G network card control module, the output end of the data encapsulating module is connected with a data distributing module, and the data distributing module receives linkage state signals of the various 3G network card modules and distributes the external data after being subjected to data encapsulation to the 3G network card modules. In the invention, the data transmitting capability of a 3G network is greatly improved by the data transmitting device and the data receiving device, the problems of delayed shaking, packet loss, derangement and the like of the data transmission in the practical application of the 3G network can be solved, so that the 3G network can meet the requirements of transmitting video data and other multimedia data on such special application occasions as emergency live broadcasting, commanding or the like.

The invention belongs to the technical field of a smart home and relates to a gateway protocol for the smart home. For a data conflict phenomenon possibly caused when a plurality of smart home terminals access a gateway synchronously, the invention mainly provides a method for limiting device access at the gateway to solve the problem. The scheme of the method mainly is that differential setting is carried out on each smart home device and the communication format of the gateway; and according to the functions and purposes of the various smart home devices, when the smart home devices access synchronously, an arbitration instruction is preset according to a demand of a user, and the access sequence of all smart home device is limited through the arbitration instruction, so only one device is accessed to communicate at one time. The gateway protocol has the beneficial effects that the receiving conflict and the receiving and sending processing of the data can be effectively separated, the packet loss problem is effectively solved, moreover, the method can be realized simply, the cost is low and the method is especially applicable to the field of the smart home.

The invention provides a data sending method and device. The method comprises the steps that: an Optical Line Terminal (OLT) divides logic links supported by an Optical Network Unit (ONU) into one ora plurality of logic link groups; and the OLT allocates a bandwidth to the logic link groups of the ONU, so that each logic link in the logic link groups of the ONU shares the bandwidth to send data.By the data sending method and device provided by the invention, logic links of a sender is subjected to logic link grouping, and a plurality of logic links are divided into one logic link group, so that the number of fragmentable links can be effectively reduced, thereby reducing the requirement for a reconstruction buffer of a receiver, solving a problem of packet loss caused by insufficient reconstruction buffer of a receiving side in the data sending process in the related art, and achieving the technical effect of effectively preventing packet loss.

The invention provides a method for solving a blurred screen phenomenon produced by a video stream transmission system. The method comprises the following steps: importing a message queue and an intermediate proxy, wherein the message queue is used for caching video stream transmitted to a client by a server through a UDP protocol, and the intermediate proxy judges whether the video has been sentto the client after receiving a downloading request and cookie sent by the server; if the video stream has been sent to the client, judging whether the packet loss phenomenon is existent in the videostream cached in the message queue at the first time, if the packet loss phenomenon is existent, re-caching, and continuously enabling the server to send the data cached at the second time to the message cache to cache; when the packet loss phenomenon is inexistent, keeping the video stream of the downloading request received by the server again from caching to the message queue, wherein the intermediate proxy directly takes the video stream in the message queen to send to the client. The existent blurred screen problem due to packet loss or streaming phenomenon is solved, and then the technical problem that excessive bandwidth is wasted since the server resends the video stream is further avoided.

The invention provides a method for dynamic matching of a message through prejudging. The method comprises the steps that a CPU (central processing unit) receives the message and judges whether the massage is matched with a first tablebody of a connection table, if so, the massage is a keep-alive connection massage, and the first tablebody is put at the last-of-chain of the connection table. The method is used for improving the matching speed of the massage, and solves the problem of packet loss caused by excessive usage frequency of the CPU.