WO2010121520A1

WO2010121520A1 - Signal transmission method, apparatus and communication system for optical transport network

Info

Publication number: WO2010121520A1
Application number: PCT/CN2010/071715
Authority: WO
Inventors: 董立民; 吴秋游
Original assignee: 华为技术有限公司
Priority date: 2009-04-24
Filing date: 2010-04-13
Publication date: 2010-10-28
Also published as: CN101873517A; CN101873517B

Abstract

A signal transmission method, apparatus and communication system for optical transport network are provided by the embodiments of the invention. Said method comprises: obtaining client signals (210); mapping said client signals into an optical channel data unit xt (220); dividing said optical channel data unit xt into x independent optical channel data units t (230); multiplexing said x optical channel data units t into time slots of an optical channel data unit k, and transmitting said optical channel data unit k to target nodes (240). By dividing client signals into several blocks, the technical solutions provided by the embodiments of the invention use some time slots of an optical channel data unit k to bear the divided client signals, and can flexibly adjust bandwidth occupied by the client signals with smaller bandwidth granularity, and can improve utilization of bandwidth resource relatively.

Description

Signal transmission method, device and communication system of optical transmission network The application is submitted to the Chinese Patent Office on April 24, 2009, and the application number is CN 200910137342.7, and the invention name is "signal transmission method, device and communication system of optical transmission network" Priority of the Chinese Patent Application, the entire contents of which is incorporated herein by reference.

Technical field

The present invention relates to the field of communications technologies, and in particular, to a signal transmission method, device, and communication system for an optical transport network.

Background technique

OTN (Optical Transport Network) technology is considered to be the core technology of the next generation transport network. OTN has powerful TCM (Tandem Connection Monitoring) capability, rich OAM (Operation Administration Maintenance), and FEC (Forward Error Correction) capability. Flexible scheduling and management of large-capacity services.

OTN technology mainly includes the technology of electrical processing layer and optical processing layer. In the electrical processing layer, the "digital encapsulation" structure defined by OTN technology can realize the management and monitoring of customer signals. The G.709 recommendations developed by the International Telecommunication Union's Communications Standards Department (ITU-T) are primarily standards for OTN frame structure and mapping. The standard frame structure of the OTN defined in the G.709 recommendation can be as shown in Figure 1. The OTN frame is a 4080*4 modular structure, including: Frame Alignment Signal (FAS, Frame Alignmem Signal), which is used to provide frame synchronization positioning. ; Optical channel transport unit k (OTUk, Optical Channel Transport Unit-k) overhead (OH, Overhead), used to provide network management functions at the optical channel transmission unit level; Optical channel data unit k (ODUk, Optical Channel Data Unit-k Overhead, used to provide maintenance and operation functions; optical channel payload unit k (OPUk, Optical Channel Payload Unit-k) overhead, used to provide service adaptation function; OPUk payload area (Payload), also known as OTN Framed The payload area is mainly used to provide the bearer function of the service; the FEC is a forward error correction byte for providing error detection and error correction. Where the coefficient k represents the supported bit rate and different kinds of OPUk, ODUk and OTUk, for example, k = 1 indicates a bit rate of 2.5 Gbit s, k = 2 indicates a bit rate of 10 Gbit/s, and k = 3 indicates a bit rate. It is 40Gbit/s.

OTN is generally used for the transmission of fixed bit rate (CBR) services. However, with the extensive use of Ethernet technology and the development of data services, more and more packet services need to be transmitted on the OTN network. At present, the OTN packet service transmission method defined by G.709 is mainly used to transmit a packet service signal. The method defined by G709 is that the node directly maps the packet service signal to 0DU1 and ODU2 through a mapping method of GFP (Generic Frame Procedure). Or transfer in the ODU3 container.

In the process of implementing the present invention, the inventor has found that the packet service is characterized by a sudden change in its statistical multiplexing traffic, and the bandwidth of the smallest channel ODU1 currently available for OTN is also as high as 2.5G. The service transmission mode is not conducive to the operator to finely allocate the transmission network bandwidth according to the customer's requirements, which may cause waste of bandwidth resources.

SUMMARY OF THE INVENTION The technical problem to be solved by the embodiments of the present invention is to provide a signal transmission method, device, and communication system for an optical transmission network, which relatively improves utilization of bandwidth resources.

In order to achieve the above object, the embodiments of the present invention provide the following technical solutions:

A signal transmission method for an optical transmission network includes:

Acquiring a client signal; mapping the client signal into the optical channel data unit xt; splitting the optical channel data unit Xt into X independent optical channel data units t; and multiplexing the X optical channel data units The time slot of the optical channel data unit k is used and the optical channel data unit k is transmitted to the destination node.

A signal transmission method for an optical transmission network includes:

Receiving an optical channel data unit k; demultiplexing time slots of the optical channel data unit k to obtain X optical channel data units t; synthesizing the X optical channel data units tiJL into optical channel data units xt; The optical channel data unit xt is obtained to obtain a client signal carried by the optical channel data unit x.

A transport network node, comprising: An acquisition module, configured to acquire a client signal; a mapping module, configured to map the client signal into the optical channel data unit Xt; and a splitting module, configured to split the optical channel data unit Xt into X independent lights a channel data unit t; a multiplexing transmission module, configured to multiplex the X optical channel data units t into time slots of the optical channel data unit k, and transmit the optical channel data unit k to the destination node.

A transport network node, comprising:

a receiving module, configured to receive an optical channel data unit k; a demultiplexing module, configured to demultiplex a time slot of the optical channel data unit k, to obtain X optical channel data units t; a combination module, configured to: The X optical channel data units t are combined into an optical channel data unit xt; a demapping module for demapping the optical channel data unit xt to obtain a client signal carried by the optical channel data unit xf.

A communication system comprising:

a first node, configured to acquire a client signal; mapping the client signal into the optical channel data unit xt; splitting the optical channel data unit xt into X independent optical channel data units t; The optical channel data unit t is multiplexed into the time slot of the optical channel data unit k and transmits the optical channel data unit k; the second node is configured to receive the optical channel data unit k; and demultiplex the optical channel data unit a time slot of k, obtains X optical channel data units t; combines the optical channel data units t into optical channel data units xt; demaps the optical channel data unit xt to obtain the optical channel data unit xt ^ Loaded customer signals.

It can be seen from the foregoing technical solutions that the technical solutions provided by the embodiments of the present invention have the following advantages: splitting a client signal into a plurality of blocks, and using a plurality of time slots of the ODUk to carry the split client signals, which can be performed with a smaller bandwidth granularity. Flexible adjustment of the bandwidth occupied by the client signal can relatively improve the utilization of bandwidth resources.

BRIEF DESCRIPTION OF THE DRAWINGS In order to more clearly illustrate the embodiments of the present invention and the technical solutions in the prior art, the drawings used in the embodiments and the prior art description will be briefly described below. Obviously, in the following description The drawings are only some of the embodiments of the present invention, and those skilled in the art can obtain other drawings based on these drawings without any creative work.

1 is a schematic structural diagram of an OTN frame provided by the prior art; 2 is a flow chart of a signal transmission method of an optical transport network according to Embodiment 1 of the present invention;

3 is a flow chart of a signal transmission method of an optical transmission network according to Embodiment 2 of the present invention;

Figure 4-a is a schematic structural diagram of an ODUxt according to a second embodiment of the present invention;

Figure 4-b is a schematic structural diagram of an ODUt according to Embodiment 2 of the present invention;

Figure 4-c is a schematic diagram of an ODUxt splitting according to the second embodiment of the present invention;

Figure 4-d is a schematic diagram of mapping of an ODUt to an ODUk according to the second embodiment of the present invention;

FIG. 4 is a schematic structural diagram of an OPUt overhead area of an ODUt according to Embodiment 2 of the present invention; FIG. 5 is a flowchart of a method for adding an ODUk time slot according to Embodiment 2 of the present invention;

6 is a flowchart of a method for deleting an ODUk time slot according to Embodiment 2 of the present invention;

7 is a schematic structural diagram of a transport network node according to Embodiment 3 of the present invention;

8 is a schematic structural diagram of a transport network node according to Embodiment 4 of the present invention;

FIG. 9 is a schematic structural diagram of a communication system according to Embodiment 5 of the present invention.

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. example. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative work are within the scope of the present invention.

Embodiments of the present invention provide a signal transmission method, device, and communication system for an optical transport network, which splits a client signal into a plurality of blocks, and uses a plurality of time slots of the ODUk to carry and transmit the split client signals, respectively, which can relatively increase the bandwidth. Utilization of resources.

The detailed description will be respectively made below by way of specific examples. Referring to FIG. 2, a first embodiment of a signal transmission method for an optical transport network according to an embodiment of the present invention may include:

210. Obtain a customer signal.

The source node in the transport network can obtain the client signal through its optical port and/or Ethernet port, and the service type of the acquired client signal can be various. In an application scenario, the client signals acquired by the source node include: a packet service signal and/or a CBR service signal. 220. Mapping the client signal to the optical channel data unit xt.

The optical channel data unit xt is a container that carries the client signal. The source node can set the ODUxt size according to the service requirements and the reference conditions such as the available resources.

The source node can select an appropriate mapping manner according to the type of the client signal, and map the obtained packet service signal and/or CBR service signal to the ODUxt.

230. The optical channel data unit xt is split into X independent optical channel data units, wherein the optical channel data unit t (ODUt) is a row and column module of 4*3824, and the optical channel data unit xt (ODuxt) is considered to be x ODUts are combined according to predetermined combination rules. In one application scenario, ODUxt can be a 4* (3824 *x ) row and column module, and x is a positive integer.

Therefore, the source node can split the ODUxt into X ODUts according to a predetermined splitting rule, and split the client signal into several blocks to reduce the rate of the client signal.

240. The X optical channel data units t are multiplexed into the time slots of the optical channel data unit k, and the optical channel data unit k is transmitted to the destination node.

The source node can multiplex the ODUt into the time slot of the ODUk by adjusting the frequency and rate of the ODUt, and the X ODUts can be multiplexed into the X time slots of the ODUk.

It can be understood that the source node and the destination node are relative, and the source node may also be the destination node of other nodes, and the destination node may also be the source node of other nodes.

It can be seen from the foregoing technical solution that, in this embodiment, the client signal is split into several blocks, and the split client signals are carried by using several time slots of the ODUk, and the client signal can be flexibly adjusted with a small bandwidth granularity. The occupied bandwidth can relatively improve the utilization of bandwidth resources. For the sake of understanding, the process of transmitting the client signal between the node A and the node B in the transport network is taken as an example for further detailed description. Referring to FIG. 3, a signal transmission method of the optical transport network is the second embodiment of the present invention. Embodiments can include:

301. Node A obtains the ^^ household signal.

The transport network is mainly used to carry various types of services of the transport service network, and the service types may include: a packet service, a CBR service, and the like. The bit rate of the packet service is usually indeterminate. That is to say, the packet service may be a high-rate service or a low-rate service, and the rate of the CBR service is relatively determined.

Node A can obtain customer signals through its optical port and / or Ethernet port.

In the following, the client signal obtained and transmitted by the node A is a packet service signal and/or a CBR service signal. For example, a detailed description will be given.

302. Node A maps the foregoing client signal to the ODUxt.

It can be considered that ODUxt is a container for carrying customer signals, and node A can specifically set the size of ODUxt according to service conditions and reference conditions such as available resources.

For example, if the service rate is large, node A can set the ODUxti to be larger; if the service rate is small, node A can set the ODUxt to be smaller.

In an application scenario, the structure of the ODUxt can be as shown in Figure 4-a. The ODUxt can be a 4* (3824*x) row and column module. The structure of the ODUt can be as shown in Figure 4-b. The structure of the ODUt is the same as that of the ODUk. It is a 4*3824 row and column module. Figure 4-b omits the ODUt overhead.

It can be considered that ODUxt is composed of X ODUts according to a predetermined combination rule. Where X is a positive integer. For example, if ODUxt is specifically ODU4t, it can be considered that ODU4t is composed of 4 ODUts according to a predetermined combination rule.

In an application scenario, if the client signal is a packet service signal, the node A may map the packet service signal to the ODUxt by using a generic framing procedure (GFP) mapping method; if the client signal is a CBR service signal, Node A can map the above CBR service signals to ODUxt by using the Generic mapping procedure (GMP) mapping method.

In another application scenario, if the client signal is a packet service signal, the node A may use the GFP mapping mode to map the packet service signal to the ODUxt. If the client signal is a CBR service signal, the node A may adopt the GMP mapping mode. The above CBR service signal is mapped into the ODUw.

In the following, the node A will map the obtained packet service signal and/or CBR service signal to the ODUxt as an example for specific description. Of course, the node A can also use other mapping methods to map the client signal to the ODUxt, which is not limited by the present invention.

303. Node A splits the above ODUxt into X independent ODUts.

Please refer to Figure 4-c. Figure 4-c is a schematic diagram of ODUxt splitting. Node A may split the ODUxt carrying the packet service signal and/or the CBR service signal into X independent ODUts according to a predetermined splitting manner. The structures of the X independent ODUts are the same. Each ODUt^P can carry its sequence information in the ODUxt. The sequence information can be used to recover the client signals carried by the ODUxt. Specifically, the ODUxt can be reassembled by using the sequence information carried by each ODUt, thereby recovering the client signal carried by the ODUxt. For example, if the node A splits the ODU3t into three independent ODUts, the three independent ODUts can carry the sequence number 1, the sequence number 2, and the sequence number 3 respectively, and can be combined according to the split mode when needed. The three independent ODUts carrying the serial number 1, the serial number 2, and the serial number 3 are combined into one ODU3t, and the customer signal carried by the ODU3t is recovered.

304. Node A maps each independent ODUt to the optical channel data tributary unit tk. In an application scenario, node A can use GMP mapping or other mapping mode to connect each optical channel data tributary unit t to k). That is to say, if the node A obtains X independent ODUts by splitting the ODUxt in step 303, the node A maps the obtained X independent ODUts to X ODTUtk, and then obtains X ODTUtk.

Node A maps ODUt to ODTUtk primarily for rate and frequency matching adjustments to be mapped into ODUk time slots.

305. Node A maps the foregoing ODTUtk to a time slot of the ODUk, and transmits an ODUk to the Node B. In an application scenario, time slots may be allocated to the OPUk payload area of the ODUk, and 4 rows of each column of the OPUk payload area (columns 17 to 3824) constitute one time slot, and may be sequentially identified as TS1 (slot 1), TS2, up to TSn, are cycled in sequence until the OPUk payload area is divided into n time slots.

For example, if the time slot of the 1.25 Gbit/s time slot is used to divide the ODUk, the ODU1 bit rate is 2.5 Gbit/s, and the OPU1 payload area of the ODU1 can be divided into two time slots; the bit rate of the ODU2 For 10 Gbit/s, the OPU2 payload area of ODU2 can be divided into 8 time slots; the ODU3 bit rate is 40 Gbit/s, and the OPU2 payload area of ODU2 can be divided into 32 time slots; the ODU4 bit rate is 100 Gbit. /s , can divide the OPU4 payload area of ODU4 into 80 time slots.

Of course, it is also possible to divide the OPUk payload area of the ODUk by 2 Gbit/s, lGbit/s, 0.5 Gbit/s or other size slot particles to obtain a suitable slot bandwidth.

See Figure 4-d. Figure 4-d is a schematic diagram of mapping from ODUt to ODUk. Node A can multiplex x ODUts into X time slots of ODUk. If in step 302, node A maps the CBR service signal to the ODUw, node A may further map the ODUw to ODTUjk and map ODTUjk to the time slot of the ODUk.

In addition, the time slot of the high-rate ODUk can also carry the low-rate ODUk. For example, one ODU1 can be multiplexed into two time slots of the ODU2, and the ODU2 can be multiplexed into the eight time slots of the ODU2. And so on. That is to say, the time slot of the high-rate ODUk can carry the ODUt, the ODUw, and the low-rate ODUk to implement multiplexing between different types of ODUs.

The node A can notify the node B of the type of the ODU carried by each time slot of the ODUk, and the manner in which the node A notifies the node B can be various. In an application scenario, the node A may notify the node B of the type of the ODU carried in each time slot of the ODUk by carrying the indication information in the PSI (payload structure identifier) of the ODUk.

For example, the PSI[i] byte includes 8 bits, wherein the upper 3 bits may be referred to as an ODU-Type indicator bit, which may be used to carry type indication information of the ODU, and the lower 5 bits may be referred to as TS (time) The gap indicator may be used to carry indication information indicating the slot identifier.

For example, if 000, 001, 010, 011, and 100 respectively indicate 0DU1, ODU2, ODU3, ODUt, and ODUw; 00000 indicates TS1, 00001 indicates TS2, 00010 indicates TS3, and so on, if OSI of PSI[i] The value of the -Type indicator is: 011, and the value of the TS indicator is: 00000. Then, the Node B can learn that the type of the ODU carried by the time slot 1 of the ODUk is ODUt according to the information carried in the PSI[i] byte. And so on. The node A notifies the node 8 of the type of the ODU carried by each time slot of the ODUk by using the PSI byte in a multiframe loop manner.

Please refer to Figure 4-e. Figure 4-e is a schematic diagram of the structure of the OPUt overhead area of the ODUt. As shown in Figure 4-e, the 3 bytes of the 1st to 3rd rows of the 15 columns of the OPUt overhead area are TCOH bytes, specifically including: TCOH1, TCOH2, TCOH3, and the above TCOH bytes are used to transmit the link capacity. LCAS (Link Capacity Adjustmemt Scheme) information. The fourth column of the 15 columns of the OPUt overhead area is the PSI byte. The PSI[0] may carry the indication information of the payload area type (PT, Payload Type), that is, the indication information indicating the mapping type used to map the client signal to the OPUt payload area.

In an application scenario, the multiframe period of the ODUt is 32, the TCOH1 of the 0th frame is MFI1 byte, and the TCOH1 of the 1st frame is MFI2 byte, which is used to increase the delay compensation range, and expand the multiframe loop, which can be The delay compensation range needs to be reset. Frame 4 The TCOH1 byte is an SQ byte and is used to carry the sequence information indicating the ODUt^ODUxt. Frame 5 The TCOH1 byte includes: a CTRL field, a RAS field, and a GID field, where the CTRL field is used to carry control signaling, and the RAS field carries a reply command.

TCOH2 is a status indication byte for carrying the indication information of the ODUt status, TCOH3 is CRC8 bytes, and TCOH3 of each ODUt of the frame is used to perform positive information on the information carried by the TCOH1 and TCOH2 of the ODUt and provide certain error correction capability. RES is a reserved byte. The Node B can receive the ODUk sent by the node A; demultiplex the time slot of the ODUk to obtain X ODUts carried by the node; and combine the X ODUts into ODUxt; demap the ODUxt to obtain the client signal carried by the ODUxt, and then recover Out of the customer signal.

Further, the node A may send a time slot modification command to the node B when the time slot of the ODUk carrying the ODUt is changed. The time slot modification command may be a time slot increase command, a time slot delete command, or the like. The time slot modification command is mainly used to instruct the node B to add, delete, or modify the time slot of the ODUk carrying the ODUt, and facilitate the node B to demultiplex the ODUt of the time slot of the ODUk.

If node A changes the size of the ODUxt that sets the client signal, that is, when the value of X changes (for example, becomes larger, or becomes smaller), the number of ODUts obtained by node A split ODUxt also increases or decreases, and bears X. The number of time slots of the ODUk of the ODUt also increases or decreases.

For example, when ODUxt is changed from ODU3t to ODU5t, splitting ODU5t to obtain 5 ODUts, carrying 3 ODUts requires 3 ODUk time slots, and carrying 5 ODUts requires 5 ODUk time slots. Therefore, node A can determine the bearer. The time slot of the ODUk of the ODUt is increased by two.

In addition, when the Node B needs to modify the time slot of the ODUk carrying the ODUt, the Node B may also send a time slot modification instruction to the Node A. The time slot modification instruction is mainly used to instruct the node A to add, delete, or modify the ODUt. The time slot of the ODUk to maintain the consistency of the state of the slot of Node A and Node B.

In the following, a brief description of the process of time slot adjustment under the control of the network management system (NMS) of node A and node B is briefly introduced.

Referring to Figure 5, the process of adding ODUk time slots carrying ODUt to Node A and Node B can be as follows:

501. The network management system sends a connection establishment instruction to node A and node B.

If the LCAS connection has not been established between node A and node B, the network management system uses the connection establishment command to instruct node A and node B to establish an LCAS connection through LCAS.

The LCAS protocol is a transport layer signaling protocol for source-sink handshake. The source and sink adjust the channel dynamically by non-destructively by negotiating the status of each time slot, for example, whether it has been used, whether it is idle, whether it is applied or released. bandwidth.

502. Node A sends a time slot increase instruction to node B.

Node B may include a number of time slot members. The ODUk time slot in which the Node B carries the ODUt is slot 1 to slot n, that is, mem (1) to mem (n).

Node A sends a slot increase command, instructing Node B to add two slot members, indicating the addition of two The time slot members are represented as: mem (n+1) and mem (n+2).

Node A can use the CTRL field to carry the slot increment instruction, ie: CTRL=ADD.

503. If the node B first receives the time slot increase instruction indicating that the mem (n+2) is added, the node B performs connectivity check on the mem (n+2). If the connection state is normal, the node B sends a status indication to the node AJ. Instruction, MSK = OK.

504. Node A sends a setting indication instruction to Node B, instructing Node B to set mem (n) to NORM and mem (n+2) to EOS.

505, Node B will! Nem (n+2) is set to EOS, mem ( n ) is set to NORM, and a set reply command is sent to node A, RSA=ACK.

506. Node B further performs connectivity check on mem (n+1). If the connection status is normal, node B sends a status indication command to node A, MSK=OK.

507. Node A sends a setting indication instruction to Node B, instructing Node B to set mem (n+2) to NORM, and mem (n+1) to EOS.

508, Node B will! Nem (n+1) is set to EOS, mem (n+2) is set to NORM, and a setup reply command is sent to node A, RSA=ACK.

Of course, Node B can also add mem (n+1) first, add mem (n+2), and finally set mem (n+2) to EOS.

The above steps are a way for the node A to indicate that the node B increases the ODUk time slot carrying the ODUt. Of course, the node A can also indicate in other manners.

Referring to Figure 6, the process of deleting the ODUk time slot carrying the ODUt by Node A and Node B can be as follows:

601. The network management system sends a connection establishment instruction to node A and node B.

If the LCAS connection has not been established between node A and node B, the network management system uses the connection establishment command to instruct node A and node B to establish an LCAS connection through the LCAS protocol.

602. Node A sends a time slot deletion instruction to node B, instructing node B to delete the time slot member mem(n), CTRL=DEL.

603. Node A sends a setup indication instruction to Node B, instructing Node B to set mem (n-1) to EOS.

604. Node B sets ! nem (n-1 ) to EOS, and sends a status indication instruction to node A, indicating that the mem (n-1) connection status is good. 605. Node B deletes mem(n), and sends a status indication instruction to node A, indicating that mem(n) is in the deleted state, MST=FAIL, indicating that mem(n) is successfully deleted.

606. The network management system sends a resource release instruction to the node B, instructing the node B to release the mem (n) resource. After receiving the resource dry command, node B releases the mem ( n ) resource.

It can be seen that, by using the foregoing process, the node A can flexibly instruct the node B to add or delete the ODUk time slot carrying the ODUt, thereby realizing the purpose of dynamically and losslessly changing the bandwidth allocation.

In another application scenario, Node B can also initiate the process of adding or deleting the ODUk time slot of the ODUt. For example, when the Node B needs to change the ODUk time slot carrying the ODUt, the Node B sends a time slot increase instruction or a time slot deletion instruction to the node A, instructing the node A to add or delete the ODUk time slot carrying the ODUt to maintain the node A. Consistency with the state of the Node B slot.

For example, if the ODUk slot of the node B that previously carried the ODUt is slot 1 to slot 4, that is, mem(1) to mem(4), if the node B finds that the mem(2) connection state is faulty or is ready to delete the mem ( 2), the Node B may send a slot deletion instruction to the node A, instructing the node A to delete the slot member mem(2) to maintain the consistency of the slot state of the node A and the node B.

In the above example, node A is the source node (source end), and node B is the target node (sink terminal). Of course, node A can also be the sink end of other nodes, and node B is the source end of other nodes. .

It can be seen from the above technical solution that the customer signal is split into several blocks, and the split client signals are carried by several time slots of the ODUk, and the bandwidth occupied by the client signal can be flexibly adjusted with a small bandwidth granularity. Relatively increase the utilization of bandwidth resources.

Further, when the source node determines that the ODUk time slot carrying the client signal changes, the source node instructs the destination node to add or delete an ODUk time slot carrying the client signal, and implements lossless allocation of bandwidth. Embodiment 3

Correspondingly, a transport network node is further provided in the embodiment of the present invention. Referring to FIG. 7, a transport network node according to Embodiment 3 of the present invention may specifically include:

The obtaining module 710 is configured to obtain a customer signal.

In an application scenario, the obtaining module 710 can obtain the client signal through the optical port and/or the Ethernet port, and the service type of the acquired client signal can be various, for example, the packet service signal and / or CBR business signals.

The mapping module 720 is configured to map the uplink signal into the optical channel data unit xt. The splitting module 730 is configured to split the ODUxt into X independent ODUts.

In an application scenario, the ODUt is a 4*3824 row and column module, and the ODUxt can be a 4*(3824*x) row and column module. It can be considered that the ODUxt is composed of X ODUts according to a predetermined combination rule, wherein The above X is a positive integer.

The splitting module 730 can split the ODUxt into X ODUts according to a predetermined splitting rule, and split the client signal into several blocks to reduce the rate of the client signal.

The multiplex transmission module 740 is configured to multiplex the X ODUts into the time slots of the ODUk, and transmit the ODUk to the destination node.

In an application scenario, the mapping module 720 can include: a first mapping sub-module 721 and a second mapping sub-module 722.

The first mapping sub-module 721 is configured to: when the client signal is a packet service signal, map the packet service signal to the optical channel data unit xt by using a general framing procedure mapping manner.

The second mapping submodule is configured to map the CBR service signal into the optical channel data unit xt by using a universal mapping procedure mapping manner when the client signal is a CBR service signal.

In an application scenario, the multiplexing transmission module 740 can include:

The third mapping sub-module 741 is configured to map each independent ODUt into the ODTUtk. The fourth mapping sub-module 742 is configured to map the ODTUtk to the time slot of the ODUk.

The transmitting submodule 743 is configured to transmit the foregoing ODUk to the destination node.

In an application scenario, the foregoing transport network node may further include:

The indication module 750 is configured to send a time slot modification instruction to the destination node when the time slot of the ODUk carrying the ODUt is changed, where the time slot modification instruction is used to instruct the destination node to add or delete the time slot of the ODUk carrying the ODUt. .

After receiving the time slot modification command, the target node may add or delete the time slot of the ODUk carrying the ODUt according to the indication of the time slot modification instruction.

It is to be understood that the transport network node in this embodiment may be the node A as described in the second embodiment, and the functions described in the respective functional modules may be specifically implemented according to the method in the second embodiment. See the related description in the second embodiment, which is not mentioned here. Embodiment 4

Correspondingly, a transport network node is further provided in the embodiment of the present invention. Referring to FIG. 8, the present invention is implemented. A transport network node of example 4 may specifically include:

The receiving module 810 receives the optical channel data unit k.

The demultiplexing module 820 is configured to demultiplex the time slots of the ODUk received by the receiving module 810, and obtain X ODUts.

The combining module 830 is configured to combine the X ODUts obtained by the demultiplexing module 820 into an ODUxt. The demapping module 840 is configured to de-map the combined ODUxt of the combination module 830 to obtain the client signal carried by the ODUx f.

In an application scenario, the receiving module 810 is further configured to receive a time slot modification instruction, where the time slot modification instruction is used to indicate to add or delete a time slot of an ODUk carrying an ODUt.

The transport network node may further include a time slot modification module 850 for adding or deleting time slots of the ODUk carrying the ODUt according to the indication of the time slot modification command.

The sending module 860 is configured to send a time slot modification instruction to the source node when the time slot of the optical channel data unit k carrying the optical channel data unit t needs to be modified, where the time slot modification instruction is used to indicate that the source node adds or deletes the bearer. The time slot of the optical channel data unit k of the optical channel data unit t.

After receiving the time slot modification command, the source node may add or delete the time slot of the ODUk carrying the ODUt according to the indication of the time slot modification instruction.

It can be understood that the transport network node in this embodiment may be the node B as described in the second embodiment, and the functions described in the respective functional modules may be specifically implemented according to the method in the second embodiment. See the related description in the second embodiment, which is not mentioned here. Embodiment 5

Correspondingly, a communication system is further provided in the embodiment of the present invention. Referring to FIG. 9, a communication system according to Embodiment 5 of the present invention may specifically include: a first node 910 and a second node 920.

The first node 910 is configured to acquire a client signal, and map the client signal to the optical channel data unit xt; split the optical channel data unit xt into X independent optical channel data units t; The optical channel data unit t is multiplexed into the time slot of the optical channel data unit k and transmits the optical channel data unit k described above.

The second node 920 is configured to receive the optical channel data unit k sent by the first node 910; demultiplex the time slot of the optical channel data unit k to obtain X optical channel data units t; and use the X optical channel data The unit t is combined into an optical channel data unit xt; the optical channel data unit xt is demapped to obtain a client signal of the optical channel data unit xt^.

In an application scenario, the first node 910 is further configured to send a time slot repair to the second node 920 when it is determined that the time slot of the optical channel data unit k carrying the optical channel data unit t changes. The time slot modification instruction is used to instruct the second node 920 to add or delete a time slot of the optical channel data unit k carrying the optical channel data unit t.

The second node 920 is further configured to receive a time slot modification command, and add or delete a time slot of the optical channel data unit k that carries the optical channel data unit t according to the indication of the time slot modification instruction.

In an application scenario, the second node 920 may be further configured to: when the time slot of the optical channel data unit k carrying the optical channel data unit t needs to be modified, send a time slot modification command to the first node 910, where The slot modification command is used to instruct the first node 910 to add or delete a time slot of the optical channel data unit k carrying the optical channel data unit t.

The first node 910 is further configured to receive a time slot modification command sent by the second node 920, and add or delete a time slot of the optical channel data unit k that carries the optical channel data unit t according to the indication of the time slot modification instruction.

It is to be understood that the first node in this embodiment may be a transport network node as described in the third embodiment, and the second node may be a transport network node as described in the fourth embodiment, and the functional modules are The function may be specifically implemented according to the method in the second embodiment. For the specific implementation process, refer to the related description in the second embodiment, and details are not described herein again.

In summary, it can be seen from the above technical solution that the customer signal is split into several blocks, and the split signal is carried by several time slots of the ODUk, and the client signal can be flexibly adjusted with a small bandwidth granularity. The occupied bandwidth can relatively improve the utilization of bandwidth resources.

Further, when the source node determines that the ODUk time slot carrying the client signal changes, the source node instructs the destination node to add or delete an ODUk time slot carrying the client signal, and implements lossless allocation of bandwidth.

A person skilled in the art may understand that all or part of the steps of the foregoing embodiments may be completed by a program to instruct related hardware, and the program may be stored in a computer readable storage medium, and the storage medium may include : Read-only memory, random access memory, disk or disc, etc.

Signal transmission method, device and communication for optical transmission network provided by embodiment of the present invention The system has been described in detail, and the principles and implementations of the present invention are explained in the specific examples. The description of the above embodiments is only used to help understand the method and core idea of the present invention; The present invention is not limited by the scope of the present invention.

Claims

Rights request

A signal transmission method for an optical transmission network, comprising:

Acquired signal

Mapping the client signal to the optical channel data unit xt;

Splitting the optical channel data unit Xt into X independent optical channel data units t;

The X optical channel data units t are multiplexed into the time slots of the optical channel data unit k, and the optical channel data units are transmitted to the destination node.

The method according to claim 1, wherein the mapping the client signal to the optical channel data unit xt comprises:

If the client signal is a packet service signal, the packet service signal is mapped to the optical channel data unit xt by using a general framing procedure mapping manner;

And if the client signal is a fixed bit rate service signal, the fixed bit rate service signal is mapped into the optical channel data unit xt by using a universal mapping procedure mapping manner.

The method according to claim 2, wherein the multiplexing the X optical channel data units t into the time slots of the optical channel data unit k includes:

The individual optical channel data units t are mapped into the optical channel data tributary unit tk, respectively; and the optical channel data tributary unit tk is mapped into the time slot of the optical channel data unit k.

The method according to any one of claims 1 to 3, wherein the method further comprises:

And determining, when the time slot of the optical channel data unit k of the optical channel data unit t is changed, sending a time slot modification instruction to the destination node, where the time slot modification instruction is used to indicate that the destination node is added. Or deleting the time slot of the optical channel data unit k carrying the optical channel data unit t.

5. A signal transmission method for an optical transmission network, comprising:

Receiving an optical channel data unit k;

Demultiplexing the time slots of the optical channel data unit k to obtain X optical channel data units t;

Combining the X optical channel data units t into optical channel data units xt;

Demap the optical channel data unit xt to obtain a client of the optical channel data unit xt^ Signal.

The method according to claim 5, wherein the method further comprises: receiving a time slot modification instruction, where the time slot modification instruction is used to indicate to add or delete an optical channel that carries the optical channel data unit t The time slot of data unit k;

The time slot of the optical channel data unit k carrying the optical channel data unit t is added or deleted according to the indication of the time slot modification instruction.

7. A transport network node, comprising:

An acquisition module, configured to obtain a customer signal;

a mapping module, configured to map the client signal into the optical channel data unit xt; a splitting module, configured to split the optical channel data unit xt into X independent optical channel data units t;

And a multiplexing transmission module, configured to multiplex the X optical channel data units t into time slots of the optical channel data unit k, and transmit the optical channel data unit k to the destination node.

8. The transport network node according to claim 7, wherein the mapping module comprises:

a first mapping submodule, configured to: when the client signal is a packet service signal, map the packet service signal to the optical channel data unit xt by using a universal framing procedure mapping manner;

And a second mapping submodule, configured to: when the client signal is a fixed bit rate service signal, map the fixed bit rate service signal into the optical channel data unit xt by using a universal mapping procedure mapping manner.

9. The transport network node of claim 8, wherein the multiplexed transport module comprises:

a third mapping sub-module, configured to map each of the independent optical channel data units t to the optical channel data branch unit tk;

a fourth mapping submodule for mapping the optical channel data tributary unit tk into a time slot of the optical channel data unit k;

And a transmitting submodule, configured to transmit the optical channel data unit k to the destination node.

The transport network node according to any one of claims 7 to 9, wherein the transport network node further comprises:

An indicating module, configured to determine an optical channel data unit k carrying the optical channel data unit t When the time slot changes, the time slot modification command is sent to the destination node, where the time slot modification command is used to instruct the destination node to add or delete the optical channel data unit k that carries the optical channel data unit t. Time slot.

11. A transport network node, comprising:

a receiving module, configured to receive an optical channel data unit k;

a demultiplexing module, configured to demultiplex a time slot of the optical channel data unit k, to obtain X optical channel data units t;

a combination module, configured to combine the X optical channel data units t into an optical channel data unit xt; a demapping module, configured to demapping the optical channel data unit xt, to obtain a client carried by the optical channel data unit Xt7 signal.

12. The transport network node of claim 11 wherein:

The receiving module is further configured to: receive a time slot modification instruction, where the time slot modification instruction is used to indicate adding or deleting a time slot of the optical channel data unit k that carries the optical channel data unit t;

The transport network node further includes:

And a time slot modification module, configured to add or delete a time slot of the optical channel data unit k that carries the optical channel data unit t according to the indication of the time slot modification instruction.

13. A communication system, comprising:

a first node, configured to acquire a client signal; mapping the client signal into the optical channel data unit xt; splitting the optical channel data unit xt into X independent optical channel data units t; The optical channel data unit t is multiplexed into the time slot of the optical channel data unit k, and transmits the optical channel data unit k;

a second node, configured to receive the optical channel data unit k; demultiplex the time slot of the optical channel data unit k, obtain X optical channel data units t; and combine the X optical channel data units t into optical channels Data unit xt; demapping the optical channel data unit xt to obtain a client signal carried by the optical channel data unit xt.

14. The communication system of claim 13 wherein:

The first node is further configured to: when it is determined that a time slot of the optical channel data unit k that carries the optical channel data unit t changes, send a time slot modification instruction to the second node, where the time slot is modified. The instruction is used to instruct the second node to add or delete a time slot of the optical channel data unit k that carries the optical channel data unit t; The second node is further configured to: receive a time slot modification instruction, and add or delete a time slot of the optical channel data unit k that carries the optical channel data unit t according to the indication of the time slot modification instruction.