Dedicated line carrying method and system

Abstract

The application discloses a private line bearing method and system, and belongs to the technical field of communication. The private line bearing method comprises the following steps: setting an optical service unit frame period based on an optical service unit standard; defining an overhead field of an optical service unit frame in the optical service unit frame period; and configuring frame periods of nodes in a network according to states of the nodes, wherein the network comprises a plurality of nodes. According to the embodiment of the application, different frame periods are set by matching different services based on the technical capability of the optical service unit, the bandwidth efficiency of the line side is maximized, the overhead field is defined to query the optical service unit frame period information, the automatic configuration of the frame periods of the nodes in the network is realized, the technical advantages of the optical service unit are maximized, and the high quality and high efficiency of the private line product are obtained.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of communication technology, in particular to a private line bearing method and system. BACKGROUND

[0002] Synchronous Digital Hierarchy (SDH) technology is a low-speed value private line, which is mature in technology and high in reliability, and is the first choice of current high-end customers. However, SDH has a major problem in future development, that is, the bandwidth resource is insufficient and cannot evolve to large bandwidth.

[0003] Optical Transport Network (OTN) technology is a private line bearing technology based on Optical Data Unit (ODU), which has the characteristics of large bandwidth and high reliability, and focuses on large-granularity private line bearing. However, OTN has problems of insufficient pipe elasticity, low bandwidth utilization rate and inflexible bandwidth adjustment in the evolution of service packetization. SUMMARY

[0004] Embodiments of the present application provide a private line bearing method and system to solve the problems of insufficient SDH bandwidth resources, low OTN bandwidth utilization rate and inflexible bandwidth adjustment in the prior art.

[0005] In order to solve the above technical problems, the present application is implemented as follows:

[0006] In a first aspect, a private line bearing method is provided, which comprises:

[0007] setting an optical service unit frame period based on an optical service unit standard;

[0008] defining an overhead field of an optical service unit frame in the optical service unit frame period;

[0009] configuring frame periods of nodes in a network according to states of the nodes, the network comprising a plurality of nodes.

[0010] In a second aspect, a private line bearing system is provided, which comprises:

[0011] a setting module configured to set an optical service unit frame period based on an optical service unit standard;

[0012] a defining module configured to define an overhead field of an optical service unit frame in the optical service unit frame period;

[0013] a configuration module configured to configure frame periods of nodes in a network according to states of the nodes, the network comprising a plurality of nodes.

[0014] Thirdly, a computer-readable storage medium is provided, on which a computer program is stored, which, when executed by a processor, implements the steps of the method described in the first aspect.

[0015] In this embodiment, the optical service unit (OSB) frame period is first set based on the OSB standard. Then, the overhead field of the OSB frame within the OSB frame period is defined. Finally, the frame period of each node in the network is configured according to the status of each node. The network includes multiple nodes. This embodiment, based on the capabilities of OSB technology, sets different frame periods to match different services, maximizing line-side bandwidth efficiency. Furthermore, by defining the overhead field to query OSB frame period information, it achieves automatic configuration of the frame period for each node in the network, maximizing the advantages of OSB technology and obtaining high quality and high efficiency for leased line products. Attached Figure Description

[0016] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0017] Figure 1 This is a flowchart of the leased line carrying method provided in the embodiments of this application;

[0018] Figure 2 This is a schematic diagram of a network node provided in an embodiment of this application;

[0019] Figure 3 This is a schematic diagram of the dedicated line bearer system provided in the embodiments of this application. Detailed Implementation

[0020] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0021] The following is in conjunction with the appendix Figures 1-3 The present application provides a detailed description of a leased line carrying method and system through specific embodiments and application scenarios.

[0022] like Figure 1 The diagram shown is a flowchart of a leased line carrying method provided in an embodiment of this application. Figure 1 As shown, the dedicated line carrying method may include the contents shown in S101 to S103.

[0023] In S101, an optical service unit frame period is set based on an optical service unit standard.

[0024] It is worth mentioning that the optical service unit (OSU) is a technical standard released by China Communications Standards Association (CCSA).

[0025] In S102, an overhead field of an optical service unit frame in the optical service unit frame period is defined.

[0026] In S103, frame periods of nodes in the network are configured according to states of the nodes.

[0027] The network includes a plurality of nodes.

[0028] In the embodiments of the present application, first, an optical service unit frame period is set based on an optical service unit standard, then an overhead field of an optical service unit frame in the optical service unit frame period is defined, and finally frame periods of nodes in the network are configured according to states of the nodes. The network includes a plurality of nodes. The embodiments of the present application set different frame periods by matching different services based on the optical service unit technical capability, realize maximum line side bandwidth efficiency, and realize automatic configuration of frame periods of nodes in the network by defining the overhead field to query optical service unit frame period information, thereby maximizing the optical service unit technical advantage and obtaining high quality and high efficiency of dedicated line products.

[0029] In one possible implementation of the present application, setting an optical service unit frame period based on an optical service unit standard can include the following steps.

[0030] The bandwidth of the optical service unit is determined according to the size of the optical service unit single frame and the optical service unit sending period, the basic pipe bandwidth of the optical service unit is determined according to the carrying bandwidth of the virtual container particle, and the optical service unit frame period is determined according to the basic pipe bandwidth.

[0031] The size of the optical service unit single frame is a 192-byte fixed-size data block, and different broadband optical service unit pipes can be obtained by combining the size at a certain frame rate frequency. The optical service unit single frame includes an overhead field and a payload.

[0032] The broadband of the optical service unit can be determined as shown in the following formula:

[0033] 2.6 Mbps bandwidth = (1s / 590us) * 192 * 8bit

[0034] Wherein, 590us is the sending period of the optical service unit single frame, 2.6Mbps is the bandwidth of the optical service unit, and one byte includes 8 bits (bit).

[0035] It is worth mentioning that the size of the optical service unit basic pipe defined in the optical service unit standard document of CCSA is 2.6Mbps, and the single frame rate thereof is 2.6Mbps / (192*8bit)=1693 OSU single frames / second, that is, when the 2.6Mbps OSU container is formed, the single frame rate period is 590us, that is, 1693 OSU single frames are generated per second, and in the case of a certain single frame rate, 2 2.6Mbps is required to form a 5.2Mbps broadband. By analogy, 100Mbps bandwidth is 38.46 2.6Mbps, corresponding to 38.46*1693=65112 optical service unit single frames generated per second.

[0036] Since the payload bandwidth of the 2.6Mbps granule is 2.6Mbps*(192-7) / 192=2.5Mbps, 4 2.6Mbps basic pipes can be combined to obtain a 10Mb / s payload bandwidth, and therefore the 10M Ethernet (ETH) dedicated service of the current mainstream can be best matched.

[0037] However, since the smallest granule is a virtual container (VC) 12, the actual bandwidth thereof is 2.24Mbps, and therefore using the 2.6Mbps OSU single frame to carry the synchronous digital hierarchy (SDH) service is not the best container bandwidth, and about 10% of the bandwidth is wasted.

[0038] In order to exactly carry the 2.24Mbps VC12 granule, the optical service unit basic pipe needs to be set to 2.24Mbps / [(192-7) / 192]=2.33Mbps, and therefore the minimum required basic bandwidth is 2.33Mbps.

[0039] Therefore, further, in an embodiment of the present application, the determination formula of the optical service unit frame period is as follows:

[0040] Basic pipe bandwidth=(1s / optical service unit frame period)*size of optical service unit single frame*8bit

[0041] Wherein, s is second, and bit is bit, which represents the smallest unit of information.

[0042] In the case of the basic pipeline broadband being 2.24 Mbps, the optical service unit frame period can be determined as 640 us, which is the best value that can match VC12.

[0043] In the embodiments of the present application, the above-mentioned determination manner of the optical service unit frame period can match different service scenarios, flexibly set the optical service unit frame period, and achieve the best broadband bearing of various services.

[0044] In a possible implementation of the present application, the overhead field includes 7 bytes, and the overhead field of the optical service unit frame in the optical service unit frame period is defined, which can include: defining the 3rd-8th bits in the third byte in the overhead field, and carrying the reference broadband granularity indication through the 3rd and 4th bits in the third byte.

[0045] The embodiments of the present application realize the automatic configuration of the frame period of each node of the network and the automatic optimization of the bandwidth efficiency through the new protocol interaction manner by redefining the PM / TCM field of the third byte in the overhead field.

[0046] Specifically, the 3rd and 4th bits are set as: transmission time interval (TTI) function, which is used for path tracking, wherein the 3rd bit is M512 multifram indication, and the 4th bit is TTI information.

[0047] The 5th bit is set as: M32 multifram indication, which identifies the OSU32 multifram cycle.

[0048] The 6th bit is set as: automatic protection switching (APS), which is used for transmitting the APS protection switching protocol.

[0049] The 7th bit is set as: DM, which provides high-precision delay measurement.

[0050] The 8th bit is set as: link quality monitoring in the PM / TCM link range.

[0051] The TTI of the third byte is used to identify the TTI overhead function structure through the 512 multifram cycle of M512 multifram.

[0052] Specifically, M512 is divided into 1 to 128, 129 to 256, 257 to 288, and 289 to 512.

[0053] The 1st to 128th bits correspond to TTI[1:128] in the TTI overhead, which represents the source access point identification (SAPI) and is used to identify the source access point.

[0054] 129-256 correspond to TTI[129:256] in TTI overhead, indicating destination access point identification (DAPI) for identifying the destination access point.

[0055] 257-288 correspond to TTI[257:288] in TTI overhead, indicating bandwidth indication (BW). Wherein, TTI[257:264] is set to all 1 by default, for distinguishing traditional TTI mode; TTI[265:268] is reserved and set to 0 by default; TTI[269:288] is used to carry reference bandwidth granularity indication (C value).

[0056] 289-512 correspond to TTI[289:512] in TTI overhead, indicating reserved original definition.

[0057] The 4-bit field controlled by this can be used as an OSU single frame rate indication, and the specific definition is shown as follows.

[0058] 0000: 2.4M (corresponding to the mapping of SDH service)

[0059] 0001: 2.6M (corresponding to the mapping of ETH service)

[0060] 0010-1111, can be set to the best rate matching value according to different service mapping.

[0061] In one possible implementation of the present application, configuring frame periods of nodes in a network according to states of the nodes in the network can include the following steps.

[0062] According to networking, the nodes in the network are divided into nodes of different attributes, and the nodes of different attributes include boundary nodes and forwarding nodes; each node reads the optical service unit frame period state of the node, and the optical service unit frame period state includes an idle state, a configuration state and a working state; the node transmits the optical service unit frame period state to a downstream node through the next-generation optical transport network; the downstream node judges whether a configuration command is received; in the case where the downstream node judges that the configuration command is received, the downstream node sets its own state according to the optical service unit frame period state; in the case where the downstream node judges that the configuration command is not received, the downstream node does not set the optical service unit frame period state.

[0063] In the embodiments of the present application, by defining the node attribute of the network node, the node frame period setting state is designed, the setting and refreshing of the node frame period are realized through the automatic operation of the control unit. And according to the automatic configuration of the network node, through the matching relationship of the service attribute and the node attribute, the maximum optimization management of the line side broadband efficiency is realized.

[0064] The boundary node can be an access node of the OSU service, and the forwarding node can be a forwarding node of the OSU service.

[0065] As shown in the figure, the left and right nodes are boundary nodes, and the four nodes in the middle are forwarding nodes. Figure 2

[0066] In the Next Generation Optical Transport Network (NG-OTN) network, the node control unit reads the OSU frame period state of the node at a fixed period, and transmits the setting state of the frame period of the node to the downstream node through the reserved field of the electrical monitoring communication channel of each network element of the NG-OTN. The control unit of the downstream node extracts the information in the reserved field and judges whether the OSU service link configuration command issued by the management and control system is accepted. If it is determined that the node belongs to the OSU service link, the frame period state is automatically set. If the node is not configured with the OSU service link, the frame period state is not set. Thus, the automatic configuration of the frame period state of the entire network element is realized.

[0067] Specifically, the state transition of each node is as follows.

[0068] The idle state is a state in which neither the boundary node nor the forwarding node is configured with the OSU service. When the boundary node is configured with the OSU service, the node control unit will automatically set the idle state to the corresponding configuration state based on the service type. Then, after the forwarding node receives the frame period setting information of the reserved field of the electrical monitoring communication channel of multiple ports, the idle state is set to the configuration state of the frame period with the most ports by comparison.

[0069] The frame period can be 2.4Mpbs, 2.6Mpbs, or other frame periods.

[0070] The configuration state is automatically configured by the control unit after the boundary node and the forwarding node receive the OSU link configuration information and the frame period setting information of the reserved field of the electrical monitoring communication information of each network element of the NG-OTN sent by the adjacent node. The configuration state of the forwarding node can be adjusted in real time according to the change of the port sending information, so that the configuration state of the node can be adjusted in real time, and the configuration of the frame period can match the ports with the same frame period.

[0071] ​In the active state, when boundary nodes and forwarding nodes receive OSU service flows, the node state automatically transitions from configuration state to active state. In the active state, even if the number of ports with different frame periods increases, the node's OSU frame period cannot be changed to avoid service interruption. If a change is needed, the network node's OSU service can be deleted, at which point the node returns to the idle state, and automatic frame period reconfiguration can be performed.

[0072] Based on the working principle and mapping mechanism of OSUs, different OSU frame periods divide different device domains. OSUs within the same domain can communicate with each other, while OSUs in different domains cannot. Different domains can be networked through pipes wrapped on top of the optical path data unit.

[0073] When the forwarding node is in working state, the control system can automatically read the TTI[257:288] field of the M512 multiframe TTI overhead in the OSU frame format. If it matches the frame periodicity mode of the forwarding node, the services that match the frame periodicity mode of the forwarding node will be aggregated into one optical path data unit, thereby maximizing the utilization of the bandwidth efficiency of one optical path data unit on the line side.

[0074] Since services with different frame period modes cannot be demapped at a certain node, optical path data units with different bandwidths can be allocated to different frame period modes for separate carrying according to the bandwidth of the service.

[0075] For example, there are three 2.4 Mbps frame periods and two 2.6 Mbps frame periods. In this case, the three 2.4 Mbps frame periods can share one optical path data unit for common transport, while the two 2.6 Mbps frame periods can be transported separately using two optical path data units.

[0076] like Figure 3 The diagram shown is a schematic representation of a leased line bearer system provided in an embodiment of this application. Figure 3 As shown, the dedicated line carrying system may include: a setting module 301, a definition module 302, and a configuration module 303.

[0077] Specifically, the setting module 301 is used to set the optical service unit frame period based on the optical service unit standard; the definition module 302 is used to define the overhead field of the optical service unit frame in the optical service unit frame period; and the configuration module 303 is used to configure the frame period of each node in the network according to the status of each node in the network, wherein the network includes multiple nodes.

[0078] In the embodiment of the present application, the setting module 301 sets the optical service unit frame period based on the optical service unit standard, the defining module 302 defines the overhead field of the optical service unit frame in the optical service unit frame period, and the configuring module 303 configures the frame period of each node in the network according to the state of each node in the network, wherein the network comprises a plurality of nodes. The embodiment of the present application sets different frame periods by matching different services based on the technical capability of the optical service unit, realizes the maximum bandwidth efficiency of the line side, and queries the optical service unit frame period information by defining the overhead field, realizes the automatic configuration of the frame period of each node in the network, maximizes the advantages of the optical service unit technology, and obtains the high quality and high efficiency of the dedicated line product.

[0079] In one possible implementation of the present application, the setting module 301 can be used for:

[0080] According to the size of the optical service unit single frame and the optical service unit sending period, the bandwidth of the optical service unit is determined; according to the carrying bandwidth of the virtual container particle, the basic pipeline bandwidth of the optical service unit is determined; and according to the basic pipeline bandwidth, the optical service unit frame period is determined.

[0081] In one possible implementation of the present application, the setting module 301 can be used for:

[0082] The determination formula of the optical service unit frame period is as follows:

[0083] The basic pipeline bandwidth=(1s / optical service unit frame period)*optical service unit single frame size*8bit

[0084] Wherein, s is second, bit is bit, which represents the smallest unit of information.

[0085] In one possible implementation of the present application, the overhead field comprises 7 bytes, and the defining module 302 is used for:

[0086] The 3-8 bits in the third byte in the overhead field are defined; the 3 and 4 bits in the third byte carry the reference broadband granularity indication.

[0087] In one possible implementation of the present application, the configuring module 303 is used for:

[0088] According to networking, nodes in the network are divided into nodes of different attributes, and the nodes of different attributes include boundary nodes and forwarding nodes; each node reads an optical service unit frame period state of the node, and the optical service unit frame period state includes an idle state, a configuration state and a working state; the node transmits the optical service unit period state to a downstream node through the next-generation optical transport network; the downstream node judges whether a configuration command is received; in the case that the downstream node judges that the configuration command is received, the downstream node sets a state of the downstream node according to the optical service unit period state; and in the case that the downstream node judges that the configuration command is not received, the downstream node does not set the optical service unit period state.

[0089] The functions of the private line bearing system described in the present application have been implemented in Figures 1-2 The method embodiments are described in detail in the foregoing embodiments, and thus the descriptions of the embodiments are not described in detail herein.

[0090] Optionally, the embodiments of the present application further provide a computer readable storage medium, and the computer readable storage medium stores a computer program. The computer program is executed by a processor to implement each process of the private line bearing method embodiments, and the same technical effects can be achieved. To avoid repetition, the computer readable storage medium is not described herein. The computer readable storage medium includes a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, etc.

[0091] It should be noted that in this paper, the term "comprise", "include" or any other variant thereof is intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or device. Without more limitations, the element defined by the statement "comprises a" does not exclude the presence of another identical element in the process, method, article or device including the element.

[0092] From the above description of the embodiments, those skilled in the art can clearly understand that the above-mentioned embodiment method can be realized by means of software and necessary general hardware platform, of course, it can also be realized by hardware, but in many cases, the former is a better embodiment. Based on such understanding, the technical solutions of the present application can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) and includes a plurality of instructions for making a terminal (which can be a mobile phone, computer, server, air conditioner or network device, etc.) execute the methods described in the embodiments of the present application.

[0093] The embodiments of the present application are described above with reference to the accompanying drawings, but the present application is not limited to the above-described specific embodiments, and the above-described specific embodiments are merely illustrative, but not restrictive, and a person of ordinary skill in the art can make many forms under the inspiration of the present application without departing from the purpose of the present application and the scope protected by the claims.

Claims

1. A method of carrying a private line, characterized by, The method comprises the following steps: setting the optical service unit frame period based on an optical service unit standard; defining an overhead field of an optical service unit frame in the optical service unit frame period; configuring frame periods of nodes in a network according to states of the nodes, wherein the network comprises a plurality of nodes.

2. The method of claim 1, wherein, The setting of the optical service unit frame period based on the optical service unit standard comprises the following steps: determining a bandwidth of the optical service unit according to a size of an optical service unit single frame and an optical service unit transmission period; determining a basic pipe bandwidth of the optical service unit according to a carrying bandwidth of a virtual container particle; determining the optical service unit frame period according to the basic pipe bandwidth.

3. The method of claim 2, wherein, The formula for determining the optical service unit frame period is as follows: Basic pipe bandwidth = (1s / optical service unit frame period) * size of optical service unit single frame * 8bit wherein s is a second, bit is a bit, and bit represents a minimum unit of information.

4. The method of claim 1, wherein, The overhead field comprises 7 bytes, and the definition of the overhead field of the optical service unit frame in the optical service unit frame period comprises the following steps: defining 3-8 bits in a third byte in the overhead field; carrying a reference broadband granularity indication through 3 and 4 bits in the third byte.

5. The method of claim 1, wherein, The configuration of the frame periods of the nodes in the network according to the states of the nodes comprises the following steps: dividing the nodes in the network into nodes with different attributes according to networking, wherein the nodes with different attributes comprise boundary nodes and forwarding nodes; reading optical service unit frame period states of the nodes by the nodes, wherein the optical service unit frame period states comprise an idle state, a configuration state and a working state; transmitting the optical service unit period states to downstream nodes by the nodes through a next-generation optical transmission network; judging whether a configuration command is received by the downstream nodes; setting states of the downstream nodes according to the optical service unit period states in a case where the configuration command is received by the downstream nodes; not setting the optical service unit period states in a case where the configuration command is not received by the downstream nodes.

6. A dedicated line carrying system characterized by, The method comprises the following steps: a setting module configured to set the optical service unit frame period based on an optical service unit standard; a defining module configured to define an overhead field of an optical service unit frame in the optical service unit frame period; a configuration module configured to configure frame periods of nodes in a network according to states of the nodes, wherein the network comprises a plurality of nodes.

7. The system of claim 6, wherein, The setting module is configured to: determine a bandwidth of the optical service unit according to a size of an optical service unit single frame and an optical service unit transmission period; determine a basic pipe bandwidth of the optical service unit according to a carrying bandwidth of a virtual container particle; determine the optical service unit frame period according to the basic pipe bandwidth.

8. The system of claim 7, wherein, The setting module is further configured to: The formula for determining the optical service unit frame period is as follows: Basic pipe bandwidth = (1s / optical service unit frame period) * size of optical service unit single frame * 8bit wherein s is a second, bit is a bit, and bit represents a minimum unit of information.

9. The system of claim 6, wherein, The overhead field comprises 7 bytes, and the defining module is configured to: bits in a third byte in the overhead field are defined; a reference wideband granularity indication is carried through the 3rd and 4th bits in the third byte.

10. The system of claim 6, wherein, The configuration module is used for: dividing each node in the network into nodes with different attributes according to networking, wherein the nodes with different attributes include boundary nodes and forwarding nodes; each node reads an optical service unit frame period state of the node, wherein the optical service unit frame period state includes an idle state, a configuration state and a working state; the node transmits the optical service unit period state to a downstream node through a next-generation optical transport network; the downstream node judges whether a configuration command is received; in a case where the downstream node judges that the configuration command is received, the downstream node sets a state thereof according to the optical service unit period state; in a case where the downstream node judges that the configuration command is not received, the downstream node does not set the optical service unit period state.

Images