312 results about "Packet transport network" patented technology

A routing device for routing streams at a node in a packet transmission network receives a stream request, reads specified parameters and any values for loss and delay already incurred at preceding nodes in the network, or specified parameters as modified to take account of loss and delay already incurred at preceding nodes in the network, to determine in conjunction with existing streams already being handled by the routing device whether to accept or reject the stream, allocates one or more buffers to the stream if the stream request has been accepted, transmits the stream request with modified values for loss and delay, or with modified parameters to take account of loss and delay incurred at this and preceding nodes in the network if the stream request has been accepted, and returns a fail signal if the stream request has been rejected.

The invention applies to packet transmission networks. It proposes an adaptive forward error control scheme implemented at the application level, allowing to respect a maximum tolerated packet error rate. According to the invention, the amount of redundancy is adapted so as to offer a correction capability allowing to respect said maximum tolerated packet error rate. Advantageously, the maximum tolerated packet error rate is set by the application.

A method for providing mobility of a mobile node in a packet transport network, and a packet transport network system are provided. The packet transport network system includes a plurality of gateway switches configured in a plurality of packet transport access networks to connect a packet transport core network and transmit/receive a packet to/from a certain terminal via a certain access switch. When the certain terminal moves, each gateway switch updates a tunnel mapping and management table according to the movement of the certain terminal, allocates a pre-set tunnel by using information included in the tunnel mapping and management table, and transmits/receives a packet to/from a counterpart terminal via the allocated tunnel. Thus, a packet loss and delay due to the influence of handover occurring when the mobile node moves between networks can be minimized and the handover procedure can be simplified.

The invention discloses a link fault positioning method and system of a packet transport network (PTN). The method comprises the following steps: when a first business end detects the condition that a connectivity fault appears in a link between the first business end and a second business end, automatically triggering fault positioning, and sending a loopback message to the second business end along the a faulty link; when an intermediate node positioned on the faulty link receives the loopback message, forwarding the loopback message to the next node, and sending a loopback response message to the first business end along a path opposite to the path of receiving the loopback message; and positioning the position of the fault in the faulty link by the first business end according to the received loopback response message. In the invention, by automatically triggering the device after the fault is detected, a series of configurations required for manually positioning the fault are avoided, thereby being suitable for quickly positioning the fault; and by sending the loopback message, the connectivity of the link is cheked section by section and the faulty section is investigated from the returned loopback response message, thereby realizing the purpose of accurately positioning the fault.

Methods and apparatus for controlling latency variation of packets received in a packet transfer network are provided. A plurality of packets is received at a network element of a receive node of the packet transfer network. A time-stamp is provided for each of the plurality of packets. An egress delay time is computed at a scheduler of the network element for each of the plurality of packets in accordance with each corresponding time-stamp to provide a substantially constant latency for the plurality of packets upon egression from the network element.

A system and method for maximization of the global throughput of packet transport networks via traffic-load-adaptive TDM or WDM channelization. Architecturally the packet transport network is formed of logical packet transport buses that are configured in the network for transport of packets to one of the nodes of the network from the other nodes of the network. Each logical packet transport bus is dynamically channelized to create an adaptive full mesh connectivity among the nodes in the network, such that the capacity of each connection in the mesh is continuously optimized according to real-time inbound traffic patterns at the packet transport network, thereby globally optimizing the throughput of the network. The dynamic channelization of each bus is done under the control of its destination node based on the demand for transport capacity towards it presented by the individual nodes in the meshed packet transport network.

The invention discloses a networking method for a ring network of a packet transport network. The method comprises the following steps: enabling a three-layer IP route forwarding function at a convergence layer site of the PTN, and dividing other access layer sites to different access rings according to the rings, wherein the access layer sites are positioned in the same two-layer switching network. The method of the invention avoids a loop circuit on the ring network of the PTN, meanwhile meets the requirement of the network management function of the PTN and the requirement of high reliability of services, and simultaneously can meet the requirement for protecting the quick switching function of the TMPLS service from being affected by STP convergence.

The invention discloses a system time synchronization device and method in a packet transport network, relating to packet transport networks in optical communication. The device comprises a CPU (central processing unit), a time synchronization module, an FPGA (field-programmable gate array), a 1PPS+TOD (1pulse per second+time of day) time interface, an entry time stamp module, an exit time stamp module, a first PTP (precision time protocol) port and a second PTP port, wherein the FPGA is connected with the CPU through the time synchronization module; the first PTP port is connected with the CPU through the entry time stamp module; the second PTP port is connected with the CPU through the exit time stamp module; and the FPGA is also respectively connected with the CPU and the 1PPS+TOD time interface. The device and the method have the following advantages: through combination of software and hardware, nanosecond precision system time synchronization between master and slave stations in the packet transport network can be effectively and quickly implemented, and high precision timing of the whole network can be implemented.

The invention discloses queue scheduling method and device, relating to the technical field of data communication, and aiming to solve the problem that the traditional GQ scheduling causes low utilization rate of scheduling bandwidth in the entire PTN (Packet Transport Network) system. The technical scheme of the invention comprises the following steps of: inquiring the number of tokens in a token bucket corresponding to a user group queue to be scheduled; if the tokens in the token bucket corresponding to the user group queue are not enough, extracting tokens from a redundant token bucket and adding the tokens extracted from the redundant token bucket into the token bucket corresponding to the user group queue; and carrying out dequeuing operation on the user group queue according to the number of tokens in the token bucket corresponding to the user group queue. The technical scheme of the invention is applicable to the technical field for scheduling the user group queue in the PTN system.

The embodiment of the invention discloses a method for protection switching of a packet transport network, comprising the following steps: receiving a data packet from the packet transport network at a node inlet port, detecting whether the data packet is wrong or not according to the physical-layer information of the data packet, and acquiring port error rate of a link according to the detected result; and comparing the relation of the acquired port error rate and a preset port error rate threshold, if the port error rate is larger than the preset port error rate threshold, triggering protection switching. By utilizing the embodiment of the invention, the condition of degradation of performance in the network can be effectively detected, and the survivability of the network is improved. Similarly, the embodiment of the invention discloses a device and system applying the method.

The invention relates to a method and a processor for restraining Internet storm. The method comprises that the processor acquires massages to be forwarded by PTN (packet transport network); the massages are resolved, and the massage characteristics of the massages are acquired; and according to the massage characteristics, the massages are forwarded or dropped based on an access control list comprising the preset match forwarding policy. According to the invention, through setting the match forwarding policy of the corresponding massage characteristics in the access control list, ARP (address resolution protocol) request massages, MPLS (multi-protocol label switching) forwarding massages, non MPLS forwarding broadcast massages, two-layer unknown multi-cast massages and two-layer unknown unicast massages in broadcast massages to be forwarded of the PTN network are separated, and the corresponding forwarding or dropping treatment is carried out. Not only is the PTN network storm restricted, but also the drop of the broadcast massages supported by the PTN is avoided, and the service performances of the PTN network are improved.

The invention relates to a PTN traffic flow management method, which comprises the following steps: 1, in a network management server, a corresponding port of a certain service is set to be in an acquisition state, and an acquisition time interval and an acquisition time period are set; 2, the server acquires the real-time traffic flow data of the port set in an acquisition state according to the acquisition time interval in the acquisition time period; 3, network element equipment feeds the real-time traffic flow data back to the server to store the real-time traffic flow data; 4, a webmaster client acquires the name of the network element equipment, the name of the port set to be in the acquisition state, the source port and socket port of a service of which the real-time traffic flow data are already acquired from the server; and 5, the webmaster client displays a PTN end-to-end service of which the real-time traffic flow is acquired on a display interface. The method of the invention realizes the real-time monitoring of the real-time traffic flow change in the ports of PTN equipment, can manage the real-time traffic flow change at any time, and can display the real-time change from a maximum traffic flow to a minimum traffic flow.

The invention relates to a method for selecting a master clock based on a PTP (Picture Transfer Protocol) and link quality, a slave clock and a system. The method comprises the following steps of: configuring a link quality selection strategy according to a link quality index, wherein the link quality index comprises link packet loss rate, delay jitter and/or link delay; and selecting a target master clock according to the configured link quality selection strategy. In the method for selecting a master clock based on a PTP (Picture Transfer Protocol) and link quality, the slave clock and the system, a user configures the link quality selection strategy (mainly comprising the indexes of link packet loss rate, the delay jitter and/or the link delay and the like), and the target master clock is selected according to the user configuring link quality selection strategy by combining with the PTP, which not only satisfies the actual selection demands of the user, but also improves multiselectivity and flexibility when the master clock is acquired and solves the problem that the master clock can not be selected when the master clock in the traditional PTN (Packet Transport Network) does not send a notice message.

The invention discloses a PTN (packet transport network) /IPRAN (internet protocol radio access network) end-to-end business data quick creation method. The method includes following steps: A, categorically making different parameter attribute group configuration templates according to parameter attribute groups of PTN/IPRAN network maintenance objects; B, selecting corresponding parameter attribute group configuration templates to configure business attribute in a same interface layer according to business types and generating network business data; and C, hierarchically displaying the business data according to three layers of business, pseudo-wire and tunnel. By the PTN/IPRAN end-to-end business data quick creation method, a large number of fussy or complex parameter configuration works are fixed in the templates, and multilayer business configuration is integrated into monolayer configuration, so that steps of configuration operation are reduced, configuration complexity is lowered, and configuration efficiency is improved; and in addition, the mode of three-layer hierarchical displaying is adopted to maintain convenience for independent operation and modification of the business layer, the pseudo-wire layer and the tunnel layer.

In a method of coding speech signals transmitted to a user terminal during a VOIP telephone call set up via a packet transmission network the speech signals are conventionally divided into a succession of segments of the same duration by coders of the terminals before they are coded and transmitted in the form of packets and are reproduced from the packets received, eliminating any packet received twice and using a dissimulation algorithm for segments corresponding to missing packets. The method carries out an analysis during coding to identify any segment that is likely not to be able to be replaced by the dissimulation algorithm if the corresponding packet is missing. Any packet corresponding to a segment analyzed as likely not to be able to be replaced is transmitted twice by the sending terminal.

The invention discloses a rapid configuration method and system for transport network tunnels a mobile POTN (Packet enhanced Optical Transport Network), and relates to the technical field of service configuration in the mobile POTN. The method comprises the steps of automatically searching an optimum data channel and a set of optimum optical channels according to a source node and a destination node appointed by a user, optical fiber connection conditions in and between the nodes, and analysis of resource occupation conditions, and finishing path configuration of an optical transport network; configuring circuit basic attributes of the tunnels, and finishing binding services of a packet transport network through analysis of carrying conditions in the data channels of a service layer; downloading configured node information in the tunnels to a device, and finishing interconnection of configuration and service of the transport network tunnels of the POTN. According to the method and the system, the optical channels and the data channels of the service layer, and the client layer tunnels can be configured rapidly, smartly and flexibly, the service configuration efficiency is greatly improved, and the user experience is better.

The invention discloses an ultra-precise time frequency transfer method suitable for a DWDM optical transmission system. The ultra-precise time frequency transfer method comprises the following steps of (a) firstly establishing a mathematical model of an ultra-precise optical fiber timing system; (b) completely achieving ultra-precise time frequency synchronism between a master station and a slave station of a DWDM optical transmission system; (c) then adopting an optical fiber time delay online monitoring technology to perform accurate measurement of a time delay value of each optical fiber in a DWDM optical cable; (d) compensating transmission time delay symmetric difference values of each pairs of optical fibers of the DWDM to be smaller than 0.1ns; (e) adopting the optical fiber time delay online monitoring technology and an optical fiber time delay automatic locking and isostatic compensation technology to reduce negative effects brought by stripping optical fiber time delay drifting and aging accumulation. Compared with the prior art, the problem that self-adaptation control of optical fiber time delay change values in a existing optical synchronous digital system, a packet transport network and other optical communication networks cannot be achieved and the synchronization precision is difficultly improved due to the defects existing in an original time synchronization technology is solved.

This patent concerns a system and method for detecting a mass calling event in a telephone system and to regulate telephone calls to a call destination for which a mass calling event has been detected where a packet transport network and Call Server is integrated into the Public Switched Telephone Network (PSTN). A packet transport network and a central Call Server implement switching functionality traditionally provided by numerous Time Division Multiplexing (TDM) switches within the PSTN. A credit bucket mechanism is used for call regulation in a mass calling event. The packet network may be based on (but is not limited to) ATM, Frame Relay, or IP packet protocols.

The invention provides a global service dynamic optimization method and device for a software defined packet transport network. Cyclic or triggered routing calculation and bandwidth allocation are performed by monitoring the global network resource state and the service bandwidth change in real time. The method comprises the steps of calculating routing via a routing algorithm, and allocating an initial minimum bandwidth to each service according to a minimum bandwidth parameter of each service; calculating the bandwidth allocated to each service in the remaining network resource according to the weight value of each service and the real-time monitored service bandwidth data, and performing remaining bandwidth allocation; and allocating a routing path to each service according to the initial minimum bandwidth allocated to each service and the bandwidth allocated to each service in the remaining network resource. The method and the device realize service routing allocation and dynamic optimization, and then realize load balance, thereby improving the utilization rate of resources and improving the user experience.

The invention relates to the selection and sorting, by a device having access to one or more packet transmission networks, of the packets relating to it, from among the entirety of the packets made available by the networks, given that the packets respect at least two layers of protocols or even more. It consists of a method of selecting and sorting that successively implements, in respect of searches for matching addresses, two directories of addresses, the first of so-called lower levels having as elements the various possible combinations of the values taken by the addressing information contained in the service information fields of the first two levels of protocols, the second so-called higher levels having as elements the addressing information contained in the service information fields of the protocols of levels higher than two, the elements of the first and second directories being linked by compatibility links targeting those that can simultaneously be in the service information fields of a packet relevant to the device.

The invention discloses a linear 1-to-N protection method, a device and a system for a packet transport network, all of which can inform a remote node of implementing 1-to-N protection switching on a working path when the failure of the working path is detected by a target node; the remote node determines the working path requiring 1-to-N protection switching, implements the protection switching, and informs the target node of the working path on which the protection switching is implemented according to the situations of the working paths detected by the remote node and the notice from the target node; and the target node implements 1-to-N protection switching on the working path on which the protection switching is implemented by the remote node according to the notice from the remote node. The method and the device can realize linear 1-to-N protection on the packet transport network, so that the bandwidth is saved. The invention relates to a linear 1-to-N protection method, device and system for a packet transport network.

The invention relates to a linear protection switching method applicable to a large-capacity PTN (packet transport network) device. At a communication source end node, output ports are configured by a crossed unit into three service forwarding instances, namely a main NNI (network node interface) port, a standby NNI port, and a main-standby NNI port; keywords matched to generate target MAC (media access control) addresses, namely MACn1, MACn2, and MACn3; at a communication destination end node, the interface units of the main and standby NNI interfaces are respectively configured with service processing instances; and the keyword to be matched is a Tunnel label; however, only the main service instance is in activated state; during switching, corresponding switching operations are implemented according to protection modes (1-plus-1 protection and 1-to-1 protection). The most fundamental thought of the linear protection switching method applicable to the large-capacity PTN (packet transport network) device is to convert centralized switching into distributed switching; the crossed unit only implements high speed packet forwarding, and does not participate in switching motions; therefore, the switching motions are carried out by a plurality of service processing units; moreover, the service processing units process the switching motions concurrently, so the switching speed is improved by times.

The invention discloses a method for managing a DCN (Data Communication Network), and relates to the field of DCNs. The method comprises the following steps: a network management server sends instruments of automatically discovered adjacent DCN nodes to network elements; the network elements acquire data and send back; network element fiber exports are obtained according to network element port numbers; adjacent network fiber imports are obtained according to adjacent network element port numbers; routes are added at the network fiber exports and between adjacent network element fiber imports; routing array is displayed after adjacent network elements are processed; the network management server sends destination network element IPs and mask-off codes to next hop network elements, initial network element inquire a route table to obtain next hop network elements and send back; the network management server remarks the routes from the initial network element to the next hop network elements, and send the destination network element IPs and mask-off codes to the next hop network elements; the destination network elements cycles to next hop network elements; and the route from the initial network element to the destination network is obtained and displayed. The method can achieve visible DCN management, improves network failure processing efficiency, and can be applicable to a PTN (Packet Transport Network), an OTN (Optical Transport Network), an SDH (Synchronous Digital Hierarchy), an MSTP (Multi-Service Transfer Platform) and other networks.