48 results about "OTN Systems" patented technology

The embodiments of the invention disclose a flexible Ethernet business's optical transport network carrying method and an apparatus wherein the method comprises: extracting a flexible Ethernet business from a flexible Ethernet service layer; performing data division to the flexible Ethernet business to obtain at least two data queues with each data queue carrying a queue identification; mapping each data queue to an optical transport network container which comprises an optical channel data unit k container or a flexible optical channel data unit container; and transporting the various optical transport network containers to the optical transport network. With the embodiments of the invention, the utilization efficiency of the band width could be raised and the optical transport network building cost is reduced.

The present disclosure relates to carrying synchronization through Ethernet, Optical Transport Network (OTN), and other asynchronous protocols. In one exemplary embodiment, timing markers or symbols are used in packets to enable a downstream device to recover timing based upon a time differential between markers or symbols. Advantageously, enabling Ethernet, OTN, etc. to carry synchronous information will de-risk switching from SONET / SDH to Ethernet and / or OTN for service providers. The present disclosure also includes frame decomposition scheme of the Ethernet stream. Ethernet packets are broken into fixed bandwidth and excess bandwidth. The fixed bandwidth is subdivided into fixed (negotiated) flits, with each flit corresponding to a specific user or combination of users like a private tunnel. This offers service providers a method to provide deterministic and more secure bandwidth over Ethernet to multiple clients.

An interworking device, method and system distribute reference timing between at least two communication networks. The interworking device includes a first communication interface operable to communicate with a first communication network operating using a first communication protocol and a second communication interface operable to communicate with a second communication network operating using a second communication protocol. The interworking device also includes a client generic framing procedure / optical transport network (“GFP / OTN”) mapping block in communication with the first communication interface and the second communication interface. The client GFP / OTN mapping block recovers a first reference timing signal from data received from the first communication network. At least one hybrid synchronous equipment timing source transforms the first reference timing signal into a second reference timing signal that is phase and frequency locked to the first reference timing signal, and supplies the second reference timing signal to the client GFP / OTN mapping block to clock the second communication 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 present disclosure provides radio frequency (RF)-based OTN systems and methods. This includes a framework to carry services over RF-based links without using SONET / SDH or asynchronous radio. In an exemplary embodiment, the present disclosure utilizes an OTN framework over RF. Additionally, the present disclosure can also apply to other non-OTN frameworks such as an extended Ethernet frame with forward error correction (FEC) over RF-based links. The present disclosure combines existing OTN FEC with a radio FEC or with an over-the-air FEC to reduce the OTN FEC. Additionally, the present disclosure utilizes unused overhead to communicate RF data rates between radios.

An interworking device, method and system distribute reference timing between at least two communication networks. The interworking device includes a first communication interface operable to communicate with a first communication network operating using a first communication protocol and a second communication interface operable to communicate with a second communication network operating using a second communication protocol. The interworking device also includes a client generic framing procedure / optical transport network (“GFP / OTN”) mapping block in communication with the first communication interface and the second communication interface. The client GFP / OTN mapping block recovers a first reference timing signal from data received from the first communication network. At least one hybrid synchronous equipment timing source transforms the first reference timing signal into a second reference timing signal that is phase and frequency locked to the first reference timing signal, and supplies the second reference timing signal to the client GFP / OTN mapping block to clock the second communication network.

The invention discloses method, device and system for synchronizing time in OTN (Open Transport Network). The method comprises the steps of generating a time synchronizing message through a main device; correcting a correction domain of the time synchronizing message for the first time; sending the time synchronizing message carrying a first timestamp T1 to the device; correcting the correction domain of the time synchronizing message by the device for a second time; adding a second timestamp T2; generating a delay request message through the device; correcting the correction domain of the delay request message for the third time; sending the delay request message to the main device, wherein the delay request message carries a third timestamp T3; correcting the correction domain of the delay request message for the fourth time by the main device; adding a fourth timestamp T4; sending a delay response message carrying the fourth corrected correction domain of the delay request message and the fourth timestamp T4 to the device; synchronizing the time with the main device by the device according to the T1, T2, T3, T4, the correction domain of the time synchronizing message and the correction domain of the delay request message.

The invention provides a service sending and receiving method and device in an optical transport network. The service sending method in the optical transport network comprises the steps of mapping anoptical transmission data unit (ODU) service into cells of a payload area of an optical transport network (OTN) interface frame, wherein the payload area comprises N cells with the fixed size, one cell bears one ODU service, and N is an integer larger than or equal to 1; and packaging and sending the OTN interface frame. Through the method and the device, the problem of serious bandwidth waste caused by transmitting the optical transmission service by dividing the payload area into the time slots in the prior art is solved, and the effect of improving the bandwidth utilization rate of the optical transmission network is achieved.

The invention provides a method, apparatus and system for determining a fusion path of an IP network and an optical transport network. The method comprises the following steps: when a transmission service request crossing an optical network domain is received, allocating a virtual link meeting service requirements in an IP network domain for the transmission service; determining a target service layer path matched with the virtual link in a pre-stored service layer path, wherein the service layer path is located in the optical network domain; and sending an activation request of activating thetarget service layer path to the controller of the optical network domain. By adoption of the method, apparatus and system, the technical problem of low efficiency of providing the required service layer path for the IP layer by an optical layer in the related art is solved.

The present disclosure provides mesh restoration systems and methods with Optical Transport Network (OTN) links using a signaling and routing protocol, such as Optical Signaling and Routing Protocol (OSRP), Automatically Switched Optical Network (ASON), Generalized Multi Protocol Label Switching (GMPLS), and the like. The present invention includes an optical node, network, and method using the signaling and routing protocol for OTN lines of differing bandwidth granularities. The present invention utilizes OTN overhead for in-band signaling and may include capability for supporting SONET / SDH lines as well as OTN lines in the same system using the signaling and routing protocol.

A transmission apparatus and method for serial and parallel channel interworking in an optical transport network are provided. The transmission apparatus for serial and parallel channel interworking ensures interworking between parallel optical modules or between parallel and serial optical modules, regardless of a protocol, without having to add logics or with only a minimum number of logics, in order to manufacture a small-size optical module with low power consumption.

The invention discloses an optical-layer service layering model configuration method and system in a network management system and relates to the technical field of computer communication. The optical-layer service layering model configuration method comprises the following steps: collecting three types of nodes including WDM (Wavelength Division Multiplexing), an OTN (Open Transport Network) anda POTN (Packet Optical Transport Network) in a communication network in a communication network, and topological connection between the nodes and in the nodes; collecting an optical port in each nodeon an optical-layer signal processing unit disc, and generating logic point objects of three levels including an optical transmission section OTS, an optical multiplexing section OMS and an optical channel OCH under the optical port; analyzing the logic point objects under the optical port and generating single-disc internal crossed connection of two levels including the OMS and the OCH; establishing end-to-end sub-network connection of the three levels including the OTS, the OMS and the OCH in network elements layer by layer; crossly configuring a downloading optical layer to equipment underthe established sub-network connection, so that the complexity of processing service data by an upper layer is simplified and the user experience is remarkably improved.

The invention discloses a data mapping method and an apparatus for an optical transport network. The method comprises the following steps: mapping of packet service on super optical channel data units (ODUS) and mapping of the ODUS in super optical channel transport units (OTUS) are carried out; and mapping of OTUS in optical channels (OChS) is further carried out, wherein the rates of the ODUS, the OTUS, and the OChS are all N times 100 gigabit per second. The magnitude of a branch sequence of the ODUS is 100 gigabit per second. N represents a positive integer greater than or equal to 2. Through the data mapping method and the apparatus for the optical transport network of the invention, a problem of how to effectively carry out frequency spectrum program and management after the introduction of the flexible grid technique in the related techniques is solved, and service providers are enabled to deploy optical transport systems of more than 100G with higher flexibility degree, and transport systems of more than 100G are no longer limited to a selected fixed rate. The utilization efficiency of fiber frequency spectrums and the flexibility of the systems are raised.

The present invention and its embodiments are made to provide for dynamic hitless resizing in optical transport network without any identification of matching time slots by the Network Management System (NMS) or any control plane signaling including Generalised Multi Protocol Label Switching (GMPLS). An aspect of the invention provides for a method of hitless ODUflex connection resizing in an optical transport network by incrementing or decrementing the ODUflex connection between the nodes, based on an indication command given to a source node for bandwidth increase or decrease, by identifying and matching at least one time slot through Link Connection Resizing (LCR) protocol message exchanges. Another aspect of the invention provides for a method of hitless ODUflex connection resizing in an optical transport network by decrementing the matching time slot used for the incrementing operation, in case of unsuccessful incrementing operation between nodes.

The invention provides a constant-bit-rate interface data receiving method and device for optical transport network (OTN) mixed services, and aims to solve the problem of the absence of a specific scheme for realizing OTN service transmission between an optical network and a PTN (Packet Transport Network) in the prior art. The method comprises the following steps: extending packet data received from a PTN side, wherein the packet format of the extended packet data is adaptive to a constant-bit-rate interface; extracting overhead data from the extended packet data; extracting payload data from the extended packet data and caching the payload data in a shift register; acquiring an output control signal according to the overhead data; reading the payload data according to the output control signal; outputting according to the transmission frame format of the OTN. In the method, the output control signal is obtained by extracting the overhead data in the packet data, and the frame-format data of the OTN are output according to the output control signal, so that service transmission between the optical network and the PTN is realized.

A method and system for service clock transparent transmission in an optical transport network (OTN) are provided. The system includes a service accessing end and an OTN receiving end; the method includes the following steps: the OTN receiving end performs de-mapping operation to an OTN frame after receiving the OTN frame, and performs two-level buffering operation to the service data flow recovered therefrom, a first buffering unit performs a homogenization treatment to the service data flow and then outputs to a second buffering unit, which the second buffering unit outputs the service data flow according to the service clock after receiving the service data flow. After adopting the present invention, it is able to ensure that the quality of the recovered service clock is relatively higher, which meets the customer requirement on the related specification of the service clock.

The invention relates to a 100G optical transport network networking method based on a metropolitan area network. The core layer in a metropolitan transport network takes large-particle services as the principal thing and is used for high-speed transmission of different services, and a convergence layer is located between the core layer and an access layer and used for converging various services of the access layer and transporting the services to the core layer in a unified mode, wherein the core layer bears 100G / 400G services, the convergence layer bears 10G / 100G services, and the access layer bears 10G / 2.5G / GE services; bearing networks of a 100G optical transport network system are adopted in the core layer and the convergence layer. Compared with past 10G / 40G OTN and 100G OTN, the 100G optical transport network is capable of bearing more services and providing more kinds of services, is particularly suitable for being applied to the core layer and the convergence layer of the large metropolitan area network, and is capable of increasing bandwidth use ratio and improving networking flexibility.

A delay measurement method of a path (P) or path segment through a transport network and a corresponding network nodes (NE1, NE2) for performing the delay measurement are described, which provide a higher precision and lower jitter. An originating network node (NE1) inserts a delay measurement request signal (REQ) into an overhead subfield of a first data unit and transmits the first data unit over the path (P) or path segment to a far-end network node (NE2) as part of framed transport signals. The far-end network node (NE2), upon detection of the delay measurement request (REQ), inserts a delay measurement reply signal (REP) into on overhead subfield of a second data unit and transmits the second data unit back to the originating network node (NE1) using framed transport signals in reverse direction. The originating network node (NE1) determines a time difference between insertion of the delay measurement request signal (REQ) and receipt of the delay measurement reply signal (REP). The far-end network node (NE2) further determines an insertion time value indicative of a time difference (t1, t2, t3) between receipt of the delay measurement request signal (REQ) and insertion of the delay measurement reply signal (REP) in reverse direction and communicates the insertion time value back to the originating network node (NE1). The originating network node (NE1) then determines a delay value for the path (P) or path segment from the determined response time difference and the received insertion time value.

The invention discloses a security reinforcement method for transporting key information in a packet transport network. The method comprises the following steps of 1, determining different transporting paths in information sending and receiving directions; 2, appointing key information interleaving, interweaving and encryption modes by receiving nodes; 3, packaging data to form N data packets and carrying out interleaving to form n new data packets; 4, establishing network connection by sending and receiving nodes; 5, adding MPLS (Multi-Protocol Label Switching) labels and sequence numbers to new data packets; 6, carrying out interweaving and encryption; 7, transporting processed data packets by the sending nodes according to the path of the sending direction; and 8, carrying out decryption, de-interleaving and de-interleaving by the receiving node, thereby restoring the key information data packets. According to the method, through data interleaving, one data packet no longer orderly contains complete data segments and the information contained in the data packets are disordered, even if a transmission link is eavesdropped and the data packets are intercepted, the data is not leaked; and the physical paths of the sending and receiving directions are different, so the security and confidentiality of transmitting the key information in the packet transport network are effectively reinforced.

The invention relates to a transmission system asynchronous mapping clock recovery method and a transmission system asynchronous mapping clock recovery device. The transmission system asynchronous mapping clock recovery method includes receiving a client service and carrying out a recovery process to a client sending clock in the client service to obtain a client recovered clock; using a sending clock of a local line side for counting cycles of the client recovered clock to obtain a client clock cycle value in a clock cycle of the line side; and inserting the client clock cycle value into an overhead of an open transport network (OTN) frame structure to pass the client clock cycle value to a downstream device. The transmission system asynchronous mapping clock recovery method and the transmission system asynchronous mapping clock recovery device have the advantages that since the clocks do not need to be extracted from service data flow, the difficulty of designing a filter circuit to remove low-frequency interference through filtration is eliminated, and at the same time, resources occupied by a clock recovery circuit are substantially reduced.

Method and system of detecting traffic in a transport network comprising obtaining network usage records from a mobile network. Extracting cell information from the network usage records. Identifying the network usage records originating from moving handsets from the extracted cell information. Matching the identified network usage records with one or more transport routes. Matching each of the one or more transport routes with a transport mode using transport mode map data.

The invention discloses a multi-service transfer platform (MSTP) optical transport network, a service transport method thereof and backbone convergence point equipment, which are used for solving the problem of relatively lower capacity of scheduling services among convergence rings in the conventional MSTP optical transport network and improving the efficiency of transporting the services among the convergence rings. A convergence layer of the MSTP optical transport network comprises a plurality of convergence rings, wherein each convergence ring comprises two backbone convergence points anda plurality of convergence points; the two backbone convergence points and the plurality of convergence points are connected in series to form a ring by an MSTP channel; and at least one backbone convergence point in each convergence ring is shared by at least two convergence rings. The invention also discloses the service transport method for the MSTP optical transport network, which is used forsolving the problem of wasting of MSTP channel resources in the conventional MSTP optical transport network and improving the service transport efficiency in the convergence rings.

The invention relates to a method for communicating at least one piece of information between a first control unit (CU1) on-board a first vehicle (V1) and a public transport network, characterised in that: the information is transmitted by the first control unit (CU1) in the form of an instruction (T2W, T2Q, T2T), said instruction being transferred to a first communication unit (I / O_1) on-board the first vehicle; the first communication unit (I / O_1) establishes a data link outside the vehicle with a second communication unit (I / O_2, I / O_3) connected to a module (EXE2, EXE3) for executing said instruction, the second communication unit and the execution module being either arranged on the ground or on-board a second vehicle (V2) comprising a second control unit (CU3); in the event of a transmission to the second communication unit (I / O_2) on the ground, the execution module (EXE2) on the ground is controlled under a slave mode governed, for said instruction, by a master mode of the first control unit (CU1); and in the event of a transmission to the second on-board communication unit (I / O_3), the execution module (EXE3) on-board the second vehicle is controlled under a slave mode governed in such a way as to let the instruction be executed under a master mode of the first control unit (CU1), thus placing, at least temporarily, a second control unit (CU2) on-board the second vehicle under a slave mode in order to execute said instruction.

The invention provides a method for realizing timed distribution in an optical transport network (OTN). The method comprises the following steps of: on the basis of the wavelength of an optical supervisory channel (OSC) used in the OTN, configuring a two-way communication channel on an optical fibre, wherein optical signals having a first wavelength and a second wavelength respectively adjacent to the central wavelength of the OSC are configured on each optical fibre, so that data is transmitted in two directions; performing OSC duplex communication in a first two-way communication channel at the position of an optical switching / multiplexing node, and performing optical timed channel (OTC) duplex communication in a second two-way communication channel; and regenerating signals in the OTC through a line amplifier (ILA), so that timed signals in the OTC are transparently transmitted.

The embodiments of the present invention provide a data transmission method and a transport network controller, which relate to the technical field of communication, and solve the problem of how to ensure the service quality of low-latency services. The method includes that: the transport network controller acquires slice information of the service data transmitted by the transport network, wherein a source address of the service data is an address of the first user equipment, and a destination address of the service data is an address of the second user equipment; the transport network controller determines whether a sending link and a receiving link of the service data corresponding to the target slice information in the service data pass through the same transmission node in an access ring of the transmission network, wherein the sending link is a path through which the first user equipment transmits the service data to a core network, and the receiving link is a path through whichthe second user equipment can receive the service data from the core network; and the transmission network is controlled to forward the service data received from the first user equipment to the second user equipment via the transmitting node.

An embodiment of the invention provides a method and a device for transmitting inter-domain interface data in an optical transport network. The method comprises the steps of: determining a rate of an inter-domain interface signal data frame according to traffic of service to be transmitted; encapsulating the service to be transmitted into the inter-domain interface signal data frame; and transmitting the encapsulated inter-domain interface signal data frame. The method and the device for transmitting inter-domain interface data in the optical transport network can unify a client interface format and simplify processing in transmission equipment or routing equipment, thereby reducing implementation cost of the entire network, and realizing end-to-end bandwidth linkage adjustment of the routing equipment and the transmission equipment.