CN109309530B

CN109309530B - Data transmission method and device

Info

Publication number: CN109309530B
Application number: CN201710632020.4A
Authority: CN
Inventors: 刘峰
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2017-07-28
Filing date: 2017-07-28
Publication date: 2023-08-01
Anticipated expiration: 2037-07-28
Also published as: WO2019019827A1; CN109309530A

Abstract

The invention provides a data transmission method and a device, wherein the method comprises the following steps: transmitting service data through a logic channel; wherein, the data of the first type of business is transmitted through the working member; transmitting data of the second class of service through the protection member; wherein the priority of the first type of service is higher than the priority of the second type of service; each physical channel in the logic channel is divided into working members or protection members, and each physical channel corresponds to each working member or each protection member one by one; and when the working member meets the preset switching condition, exchanging the physical channel corresponding to the working member with the physical channel corresponding to the protection member. According to the scheme of the invention, when a physical channel of a logic part fails, the physical channel corresponding to a protection member is exchanged with a transmission service on the failed physical channel, so that the transmission quality of part of important service data is ensured, the time delay requirement on common service data is lower, the transmission can be recovered after the failure is recovered, the problem that the reliability of a transmission pipeline is low when a FLEXE protocol is used in the business of a communication network is solved, the problem of a service protection method is solved, and the reliability of the whole network is improved.

Description

Data transmission method and device

Technical Field

The present invention relates to the field of data communications, and in particular, to a data transmission method and apparatus.

Background

The rapid increase of the information flow of the user network promotes the rapid development of the information transmission bandwidth of the communication network, the interface bandwidth speed of the communication equipment is increased from 10M (unit: bit/second, the same shall apply hereinafter) to 100M, and is increased by 1G and 10G, so that the bandwidth speed of 100G is already reached, and a large number of commercial 100G optical modules are started on the market. 400G optical modules have been developed, but the cost of 400G optical modules is high and exceeds the cost of 4 100G optical modules, so that the 400G optical modules lack commercial economic value. To deliver 400G traffic over a 100G optical module, the international standards organization defines the flex protocol. The FLEXE protocol binds a plurality of 100G optical modules to form a large-speed transmission channel, as shown in fig. 1, 4 100G optical modules are bound by the FLEXE protocol to form a 400G transmission channel, which is equivalent to the transmission speed of 1 400G optical module, and the transmission requirement of 400G service is solved without increasing the cost. Since the FLEXE protocol is a logical channel that bundles multiple physical channels into one service delivery, when one physical channel fails, the entire logical channel fails. For example, when one physical channel is interrupted, the entire logical channel is interrupted, as shown in fig. 2, so that the reliability of the bundled set of logical channels in the FLEXE protocol is reduced relative to a single service channel, and the probability of the logical channel failure is an integer multiple of the probability of the single physical channel failure, and the multiple is the total number of physical channels. In a communication system, when a communication channel fails, critical customer services need to be protected quickly and normal operation is resumed, and service interruption time cannot exceed 50ms. The reliability of the transmission pipeline defined by the FLEXE protocol is low, and a service protection method is not provided, so that the application of the FLEXE protocol in a communication network is affected.

Disclosure of Invention

In order to solve the problems, the invention provides a data transmission method and a data transmission device, which can solve the problems that the reliability of a transmission pipeline is low and a service protection method is not available when the FLEXE protocol is used in the business of a communication network.

In order to solve the technical problems, the invention provides a data transmission method, which comprises the following steps:

transmitting service data through a logic channel; wherein, the data of the first type of business is transmitted through the working member; transmitting data of the second class of service through the protection member; wherein the priority of the first type of service is higher than the priority of the second type of service; each physical channel in the logic channel is divided into working members or protection members, and each physical channel corresponds to each working member or each protection member one by one;

and when the working member meets the preset switching condition, exchanging the physical channel corresponding to the working member with the physical channel corresponding to the protection member.

Preferably, the meeting of the preset switching condition by the working member includes one of the following modes:

the physical channel corresponding to the working member fails;

detecting the working member carrying channel condition, wherein when the working member carrying channel condition meets a preset starting switching requirement, the working member carrying channel condition comprises at least one of channel interruption and error code out-of-limit.

Preferably, before the service data is transmitted through the logical channel, the method further includes:

and determining the working member and the corresponding physical channel, and determining the protection member and the corresponding physical channel.

Preferably, the number of physical channels in the logical channels is R;

the determining the working member and the corresponding physical channel, and the determining the protection member and the corresponding physical channel comprises: setting the number of the working members as M and the number of the protection members as N; m+n=r; m, N, R are positive integers;

when the working member meets a preset switching condition, exchanging the physical channel corresponding to the working member with the physical channel corresponding to the protection member comprises the following steps:

when M1 of M working members meet a preset switching condition, selecting M1 of N protection members, and exchanging a physical channel corresponding to the working member with a physical channel corresponding to the protection member; wherein M1 is a positive integer less than or equal to M and less than or equal to N.

Preferably, the exchanging the physical channel corresponding to the working member with the physical channel corresponding to the protection member includes:

determining a scheme of a protection operation; the method comprises the steps of determining the corresponding relation between a working member meeting a preset switching condition and a corresponding protection member executing interchange operation;

Starting a protection operation; the protection operation includes performing an exchange between a worker member and a protection member.

Preferably, the start-up protection operation includes:

after determining the scheme of the protection operation, starting the protection operation along with the current code stream transmission position; or, wait to start the protection operation to the start position of the next FLEXE overhead frame.

Preferably, the service data is carried to each physical channel through the selection part;

the selecting section includes a first selector and a second selector; the number of the first selectors is M, and the number of the second selectors is N; the first selector is in one-to-one correspondence with each working member, and the second selector is in one-to-one correspondence with each protection member;

the number of input interfaces of the first selector is N+1, and the number of input interfaces of the second selector is R;

the business data is divided into R paths and input to the selection unit; the M paths of data are input to the working member through the selection part, the N paths of data are input to the protection member through the selection part, the M paths of data are respectively connected to the input interface of one first selector and the input interface of each second selector, and the N paths of data are respectively connected to the input interfaces of each first selector and each second selector.

In order to solve the technical problem, the invention further provides a data transmission device, which comprises:

the transmission unit is used for transmitting the service data through the logic channel; wherein, the data of the first type of business is transmitted through the working member; transmitting data of the second class of service through the protection member; wherein the priority of the first type of service is higher than the priority of the second type of service; each physical channel in the logic channel is divided into working members or protection members, and each physical channel corresponds to each working member or each protection member one by one;

and the selection unit is used for exchanging the physical channel corresponding to the working member with the physical channel corresponding to the protection member when the working member meets the preset switching condition.

Preferably, the selecting unit determines that the working member satisfies a preset switching condition according to one of the following modes:

the physical channel corresponding to the working member fails;

Preferably, the device further comprises a setting unit, configured to determine a working member and a corresponding physical channel, and determine a protection member and a corresponding physical channel.

Preferably, the number of physical channels in the logical channels is R;

the setting unit determines a working member and a corresponding physical channel, and determining a protection member and a corresponding physical channel includes: setting the number of the working members as M and the number of the protection members as N;

m+n=r; m, N, R are positive integers;

the selecting unit exchanges the physical channel corresponding to the working member with the physical channel corresponding to the protection member when the working member meets a preset switching condition, and the selecting unit comprises the following steps:

Preferably, the selecting unit includes:

a determining submodule for determining a scheme of the protection operation; the method comprises the steps of determining the corresponding relation between a working member meeting a preset switching condition and a corresponding protection member executing interchange operation;

And the exchange sub-module is used for starting a protection operation, wherein the protection operation comprises the execution of exchange of the working member and the protection member.

Preferably, the exchanging sub-module starts a protection operation including:

Preferably, the selecting unit carries the service data to each physical channel through the selecting part;

Compared with the prior art, the technical scheme provided by the invention comprises the following steps: transmitting service data through a logic channel; wherein, the data of the first type of business is transmitted through the working member; transmitting data of the second class of service through the protection member; wherein the priority of the first type of service is higher than the priority of the second type of service; each physical channel in the logic channel is divided into working members or protection members, and each physical channel corresponds to each working member or each protection member one by one; and when the working member meets the preset switching condition, exchanging the physical channel corresponding to the working member with the physical channel corresponding to the protection member. According to the scheme of the invention, when a physical channel of a logic part fails, the physical channel corresponding to a protection member is exchanged with a transmission service on the failed physical channel, so that the transmission quality of part of important service data is ensured, the time delay requirement on common service data is lower, the transmission can be recovered after the failure is recovered, the problem that the reliability of a transmission pipeline is low when a FLEXE protocol is used in the business of a communication network is solved, the problem of a service protection method is solved, and the reliability of the whole network is improved.

Drawings

The drawings in the embodiments of the invention are for further understanding of the invention and together with the description serve to explain the invention and do not limit the scope of the invention.

FIG. 1 is a schematic illustration of a FLEXE protocol application;

FIG. 2 is a diagram illustrating a relationship between member failures and logical channel failures in the FLEXE protocol;

FIG. 3A is a diagram of FLEXE protocol overhead blocks and data block arrangement locations;

FIG. 3B is a schematic diagram of the transmission allocation of FLEXE protocol traffic over multiple physical channels;

FIG. 3C is a schematic diagram of a FLEXE protocol service receiving an allocation over multiple physical channels;

FIG. 3D is a schematic diagram of a FLEXE protocol overhead frame structure;

FIG. 3E is a schematic diagram of a FLEXE protocol overhead multiframe structure;

FIG. 4A is a schematic diagram of a FLEXE protocol key customer service protection scheme according to an embodiment of the present invention;

FIG. 4B is a schematic diagram of the protection result after the interruption of the critical client service in the FLEXE protocol;

fig. 5 is a flowchart of a data transmission method according to an embodiment of the present invention;

fig. 6 is a flowchart of a data transmission method according to an embodiment of the present invention;

FIG. 7A is a schematic diagram illustrating a service 1:1 protection scheme sender in the FLEXE protocol;

FIG. 7B is a schematic diagram illustrating a service 1:1 protection scheme receiver in the FLEXE protocol;

FIG. 7C is a schematic diagram of a service 1:4 protection scheme sender in an example two FLEXE protocol;

FIG. 7D is a schematic diagram of a service 1:4 protection scheme receiver in an example two FLEXE protocol;

FIG. 7E is a schematic diagram of a service 2:3 protection scheme sender in an example three FLEXE protocol;

fig. 7F is a schematic diagram of a service 2:3 protection scheme receiving end in an example three FLEXE protocol.

Detailed Description

The invention is further described below in conjunction with the drawings to facilitate understanding of those skilled in the art, and is not intended to limit the scope of the invention. It should be noted that, in the case of no conflict, the embodiments and various modes in the embodiments in the present application may be combined with each other.

The data transmission method provided by the embodiment of the invention is used for data transmission based on the FLEXE protocol, and before the data transmission method and the device provided by the embodiment of the invention are introduced, related contents in the FLEXE protocol are introduced.

The FLEXE protocol is currently defined in terms of the physical layer 100G rate. In the optical module, before transmitting a 100G data packet, the data packet is subjected to 64/66 coding, a 64-bit data block is expanded into a 66-bit information block, the added 2 bits are located in front of the 66-bit block and used as a start mark of the 66-bit block, and then the data packet is transmitted from an optical port in a 66-bit block mode. When receiving, the optical port distinguishes 66 bit blocks from the received data stream, then recovers the original 64 bit data from the 66 bit blocks, and reassembles the data message.

After the FLEXE protocol is at the 64-bit to 66-block conversion layer, the 66-bit data blocks are ordered and programmed before being sent, as in fig. 3A: for 100G traffic, each 20 66-bit data blocks are divided into a data block group, 20 data blocks in each group representing 20 time slots, each time slot representing the traffic speed of 5G bandwidth, and 20 time slots constituting the flex time slots calendar. When the physical layer of the 4-way 100G is bundled into a logical service bandwidth of 400G, the slot structure is composed of 80 (4×20) slots, and the Calendar is 80 slots and divided into 4 groups of 20 slots, each group being a member subsubalendar. At the physical layer, each physical layer carries the contents of one member (subthrendar), and still forms a data block group according to 20 data blocks, and an overhead block is inserted into each 1023 data block groups. The overhead blocks play a role in positioning, and a plurality of members perform positioning and ordering by taking the overhead blocks as references to restore the service. When 66-bit data blocks are transmitted, a FLEXE overhead block, such as the black block in fig. 3A, is inserted every 1023 data block groups (1023×20 data blocks) are transmitted. After inserting the overhead blocks, continuing to transmit the data blocks, after transmitting the second 1023×20 data blocks, inserting the overhead blocks, and so on, so that the overhead blocks are periodically inserted in the process of transmitting the data blocks, and the interval between two adjacent overhead blocks is 1023×20 data blocks. At the receiving end, each physical layer detects the received data, determines each 66 blocks of information blocks, and after identifying the FLEXE overhead blocks (black information blocks), can determine 20 time slot blocks. When the logical channels are bound by multiple physical management, as shown in fig. 3C, each physical channel locates FLEXE overhead, determines 20 time slots respectively, then uses the overhead block as an alignment mark, determines the queuing sequence among the members (according to the order from small to large of the member numbers) according to the member numbers carried in the overhead block in each physical channel, groups the time slots of all the members into a large time slot group calendar, and then recovers the customer service.

The FLEXE overhead block is a 66-bit long overhead block, and is inserted every 1023 x 20 data blocks at intervals when the traffic data stream is transmitted. The overhead blocks play a role in locating in the whole service flow, and the position of the first data block group and the position of the subsequent data block group in the service can be known by finding the overhead blocks. The content of the overhead blocks is as in fig. 3D, and 8 consecutive overhead blocks form an overhead frame. One overhead block consists of a 2-bit block flag and 64-bit block content. The block flags are in the first 2 columns, the following 64 columns are the block contents, the block flag of the first overhead block is 10, the block flags of the following 7 overhead blocks are 01 or SS (SS indicates content uncertainty). The content of the first overhead block is: 0x4B (8 bits, hexadecimal 4B), C bits (1 bit, indicating adjustment control), OMF bits (1 bit, indicating overhead frame framing indication), RPF bits (1 bit, indicating far-end defect indication), RES bits (1 bit, reserved bits), FLEXE group number (20 bits, indicating the number of the bundling group), 0x5 (4 bits, hexadecimal 5), 000000 (28 bits, all 0). Where 0x4B and 0x5 are the first overhead block flags, when a corresponding position in an overhead block is found to be 0x4B and 0x5, it indicates that the overhead block is the first overhead block in the overhead frame, and 7 consecutive overhead blocks next to each other constitute an overhead frame. In the overhead frame, the reserved portion is reserved content, which has not been defined, see fig. 3B black block. Fig. 3E is a schematic diagram of a FLEXE protocol overhead multiframe structure. The other byte content in the overhead frame is not relevant to the present application and will not be described in detail.

The flex protocol defines 8 overhead blocks that make up a frame, as shown in fig. 3D, with the first overhead block identified by two fields, 4B (16, identified as 0x 4B) and 05 (16, identified as 0x 5). When the corresponding positions are detected as 4B and 05 contents in the overhead blocks, it means that the overhead block is the first overhead block, and the following 7 overhead blocks constitute a frame.

In the FLEXE overhead frame structure FLEXE group number represents FLEXE binding group identification, all members with the same group number belong to a group. The PHY number is a member number, and in the same group number, the PHY number of each member is unique, and all members are ordered according to the ordering rule from small to large of the PHY number. PHY number is 8 bits of data, and can represent all numbers between 0-255, so there are a maximum of 256 members in one group. The definitions 0 and 255 in the current standard are reserved numbers, common to special applications, with the normal members using numbers 1-254.

In the first overhead block, the OMF field is a multiframe indication signal, as in fig. 3D. OMF is a single bit value, 0 in 16 consecutive frames, then 1 in 16 consecutive frames, then 0 in 16 consecutive frames, then 1 in 16 consecutive frames, repeating every 32 frames, so that the multi-frame is composed of 32 frames. In the frame, the Client callendar field represents configuration information of each time slot, and when the service is carried, the Client callendar field indicates that the time slot belongs to that Client. The number of time slots required by customer service in carrying is uncertain and needs to be flexibly modified, so that the customer service has two sets of configuration information, client calendar A and Client calendar B, and the two sets of configuration values respectively work in an operating mode and a standby mode and are used for dynamically and smoothly switching the configuration information. At one point in time, only one set of configuration values is in the active mode and the other configuration value is in the standby mode. When the configuration value needs to be modified, the configuration value of the standby mode is modified, meanwhile, the opposite terminal is informed that the configuration value of the port is changed, the opposite terminal is prepared according to the new configuration value, the prepared configuration value is returned to the initiating terminal, after the two ends agree, the switching flow of the configuration table is started, the configuration table in the original working mode is changed into the standby mode, the configuration table in the original standby mode is changed into the working mode, and the dynamic adjustment of the configuration information is realized.

The FLEXE protocol bundles multiple physical channels into one logical channel, which addresses the need for large traffic delivery bandwidths. Because the FLEXE protocol binds a plurality of physical channels into a logical channel for service delivery, when one physical channel fails, the whole logical channel fails, the reliability of the logical channel is reduced, the probability of failure of the logical channel is increased by several times, and the multiple is the total number of the physical channels. In the current version of the FLEXE protocol, when a physical channel fails, the method for service recovery is only to reject the failed channel member from the group, and add a new member again. This involves the following operations and steps: (1), a transmitting end: sending a notification that the customer service is deleted from the failed member, the failed member not delivering the customer service; (2), receiving end: accepting the time slot configuration modification notice of the transmitting end and giving a receiving reply; (3), transmitting end: deleting the customer service from the failed member, wherein the failed member does not transmit the customer service; (4), receiving end: no longer receives customer traffic from the failed member; (5) Adding a new member, and receiving customer information from the new member. The existing solution has the following defects: (1) When one member fails, for example, when a receiving and transmitting optical fiber is dug and broken at the same time, the member cannot normally transmit information between two devices, the failure information is only known in one direction, each party only knows that the receiving side fails, but does not know whether the receiving side fails normally, whether the receiving side fails in one direction or in two directions cannot be determined, and the work of deleting the time slot of the client cannot be started; (2) When one member fails, the sending and receiving ends can not normally transmit information, can not carry out notification and confirmation of time slot deletion, and can not carry out the activity of deleting the time slot of the failure channel; (3) Even if the activity of deleting the time slot of the fault channel can be performed, the whole deleting activity needs to go through a series of activities such as negotiation handshake and the like, and the required time of the communication network for service interruption is exceeded. In a communication system, when a communication channel fails, critical customer services need to be protected and restored quickly, and service interruption time cannot exceed 50ms.

In applications based on FLEXE protocol, the embodiment of the invention provides a data transmission method and device, which are used for grading customer service: important clients and ordinary clients. The service quality of important clients is very high, and when the service is interrupted, the service can be quickly recovered, and the interruption time is not more than 50ms; the common clients provide common service quality, the recovery time after service interruption is not guaranteed, and the recovery time after service interruption is long (for example, the recovery can be realized after the failure disappears). As shown in fig. 4a,5 members (No. 1, no. 2, no. 3, no. 4, no. 5 members, where No. 1-4 members are working channels and No. 5 members are protection channels) of 100G form a FLEXE group, and the total transmission bandwidth is 500G. Two clients are borne on the group, one is an important client, and the bandwidth of 400G; one is the average customer, 100G bandwidth. In configuration, the important customer service of 400G is configured on members 1, 2, 3 and 4, and the common customer of 100G is configured on member 5. When the FLEXE bearing channel is normal, both important clients and common clients are reliably transferred. As shown in fig. 4B, when the member 1 fails, the identity of the member 1 is quickly changed into the member 5, and meanwhile, the identity of the member 5 is quickly changed into the member 1 to replace the original member 1 to transmit important clients, so that the numbers of the 5 members are changed from 1, 2, 3, 4, 5 to 5, 2, 3, 4 and 1, the important clients are still transmitted by the 1, 2, 3 and 4 members in the group, the number 5 members transmit common clients, and the important clients can be quickly recovered after being interrupted instantaneously, so that the service interruption time is very short. The ordinary clients are carried by the interrupted members, and the ordinary clients can be recovered to be normal after the faults are disappeared. The spare physical channel is used for replacing the failed member, so that the damaged important customer service can be quickly recovered, and the service quality of the important customer is ensured. The service protection method only starts protection activity when the working channel fails, and the important clients are ensured by the ordinary clients. When the member does not fail, the ordinary customer and the important customer are normally transmitted, and the service is not affected.

Referring to fig. 6, the present invention proposes a data transmission method, which includes:

step 200, transmitting service data through a logic channel; wherein, the data of the first type of business is transmitted through the working member; transmitting data of the second class of service through the protection member; wherein the first type of service has a higher priority than the second type of service; each physical channel in the logic channel is divided into working members or protection members, and each physical channel corresponds to each working member or each protection member one by one;

and 300, exchanging the physical channel corresponding to the working member with the physical channel corresponding to the protection member when the working member meets the preset switching condition.

In the embodiment of the invention, the first type of service is important customer service; the second type of service is a common customer service, and the first type of service has higher requirements for recovery after interruption, so the first type of service is used as a priority protection object.

Referring to fig. 5, after step 200, further includes:

step 400, at the receiving end, detecting the numbering condition of each member in each FLEXE overhead frame in each physical channel, and sorting according to the member numbering sequence to recover all time slots and customer services.

It will be appreciated that steps 300 and 400 are not in a particular order.

In the embodiment of the present invention, the working member meeting the preset switching condition includes one of the following modes:

the physical channel corresponding to the working member fails;

detecting the working member carrying channel condition, wherein when the working member carrying channel condition meets the protection operation requirement, the working member carrying channel condition comprises at least one of channel interruption and error code out-of-limit.

In the embodiment of the present invention, before the service data is transmitted through the logical channel in step 200, the method further includes:

step 100, determining a working member and a corresponding physical channel, and determining a protection member and a corresponding physical channel.

In step 100, the protection method may be that 1 protection member protects a plurality of working members, such as 1:1,1:N (N is a positive integer); the protection mode may be that a plurality of protection members protect a plurality of working members, for example, 2:N,3:N, etc., where N is a positive integer.

For example, the logical channels include 5 physical channels, which may be set as: the 4 physical channels are physical channels corresponding to the working members, and the 1 physical channel is a physical channel corresponding to the protection member; it can also be set as: the 3 physical channels are physical channels corresponding to the working members, and the 2 physical channels are physical channels corresponding to the protection members.

Step 100 further comprises: the PHY number of the working member and the PHY number of the protection member are determined, and the PHY number of the protection member may be a special value so as to be distinguished by the receiving end, for example, the PHY number of the protection member is the maximum value, the minimum value, or 0, or 255, etc. of all the members.

Under normal conditions, the working member transmits the service on the corresponding physical channel, and the protection member transmits the service on the corresponding physical channel.

In sending service data, the working member and the protection member may be configured to carry different data, for example, service data of an important customer in a time slot of the working member, and service data of a normal customer in a time slot of the protection member.

In the embodiment of the invention, the number of physical channels in the logic channel is R;

the determining the working member and the corresponding physical channel, and the determining the protection member and the corresponding physical channel comprises: setting the number of the working members as M and the number of the protection members as N; m+n=r; m, N, R are all positive integers.

In step 200, the following points need to be described:

2-1, at 1: in N mode, the type of the selector on the working member and the corresponding physical channel is 2 to 1, one input of the selector is from the working member, and the other input is from the protection member; the type of selector on the spare member and the corresponding physical channel is n+1, 1, N inputs from the working member and one input from the protection member.

2-2, at 2: in the N mode, the type of the selector on the working member and the corresponding physical channel is 3-1, one input of the selector is from the working member, and the two inputs are from the protection member; the type of selector on the spare member and the corresponding physical channel is n+1, 1, N inputs from the working member and one input from the protection member.

2-3, under the normal working condition, the working member and the corresponding selector on the physical channel select the working member to output, and the protection member and the corresponding selector on the physical channel select the protection member to output.

In step 300, the following points need to be described:

3-1, detecting the condition of a working member carrying channel, including channel interruption, error code out-of-limit and the like, and deciding whether to start protection operation.

3-2, for 1: n protection scheme, decision result relates to working channel and protection channel selector of trouble. Pair 2: n, 3: n and the like, the decision result relates to a plurality of protection channels, and decides the protection channel participating in the protection operation and protects the working channel.

3-3, when the protection operation is started, the failed working channel and the protection channel start the protection operation at the same time.

Wherein the protection action includes performing an exchange between a working member and a protection member.

A selection part is arranged between the FLEXE shim and the optical module, and the selection part can comprise a plurality of selectors which can output data signals output by the FLEXE shim to different optical modules; the selection part may be arranged between the FLEXE shim and the light module or in the FLEXE shim, i.e. the selection part is implemented in the FLEXE shim by software control.

3-4, immediately starting the protection action after deciding the protection operation, wherein, immediately starting the protection action refers to starting the protection operation along with the current code stream transmission position, that is, immediately executing the protection action no matter which part the code stream is transmitted to, and also waiting for starting the protection action to the starting position of the next FLEXE overhead frame, wherein the protection action occurs at the boundary position of the overhead frame.

3-5, not immediately starting the protection action after deciding the protection operation, and waiting for the next FLEXE overhead frame. In the next overhead frame, the PHY number numbers in the working channel and the protection channel are replaced first, and the channel service content is not switched. The working channel carries the PHY number of the protection channel, and the protection channel carries the PHY number of the working channel and waits for the start position (two FLEXE frame overhead boundaries) of the next FLEXE overhead frame to start the protection operation.

In the embodiment of the present invention, the exchanging the physical channel corresponding to the working member with the physical channel corresponding to the protection member includes:

a protection operation is initiated, including performing an exchange between the working member and the protection member.

In the embodiment of the present invention, the start protection operation includes:

immediately starting a protection operation after determining a scheme of the protection operation; or, waiting to start the protection operation to the start position of the next FLEXE overhead frame, the protection operation occurring at the boundary position of the overhead frame.

In step 400, the following points need to be described:

4-1, detecting PHY number results of the members in each physical channel, sequencing according to the PHY number sequence, recovering group time slots, and recovering customer service.

4-2, after the PHY number of the physical channel detection member changes, sorting according to the new PHY number sequence, recovering the group time slot and recovering the customer service.

4-3, after the PHY number of the physical channel detection member changes, sorting according to the new PHY number sequence immediately, or starting sorting according to the new PHY number sequence after waiting for the next overhead frame boundary position, and selecting the starting mode of the receiving end according to the starting switching mode of the sending end.

In the embodiment of the invention, the service data is loaded on each physical channel through the selection unit;

the selection unit comprises a first selector and a second selector; the number of the first selectors is M, and the number of the second selectors is N; the first selector is in one-to-one correspondence with each working member, and the second selector is in one-to-one correspondence with each protection member;

The business data is divided into R paths and input to the selection unit; the M paths of data are input to the working member through the selection unit, the N paths of data are input to the protection member through the selection unit, the M paths of data are respectively connected to the input interface of one first selector and the input interface of each second selector, and the N paths of data are respectively connected to the input interfaces of each first selector and each second selector.

The following description is made in connection with specific examples.

Example 1

As shown in fig. 7A, a 1:1 protection scheme is provided. In the group of the FLEXE protocol, there are 2 members, one is a working channel and one is a protection channel. In the FLEXE protocol, the member number is represented by an 8-bit PHY number, with 0 and 255 member numbers reserved. In a specific implementation, in order to easily distinguish the working channel from the protection channel, the number of the protection channel may be set 255 (or may be a number 0 member, or a member number with a small number or a largest number in the group). PHY numbers of two members are coded as 1 and 255 in this example, no=1 is a working channel, and no=255 is a protection channel. Two members constitute the group of the FLEXE protocol for a total of 2 x 20 slots. Important customer traffic is carried entirely by the time slots corresponding to the working channels, in this example, the first 20 time slots are used to deliver important customers; the normal customer traffic is carried by the time slot corresponding to the protection channel (or the protection channel and the working channel together), in this example, the important customer is delivered by the last 20 time slots.

At the transmitting end, after the services of the two members are ready, the services are sent to the PHY1 and the PHY2 through a 2-to-1 controller respectively. Under normal conditions of the working members, the selector a selects traffic of the ingress port 1 to transmit to the PHY1, and the selector B selects traffic of the ingress port 1 to transmit to the PHY2. Both PHYs are delivered to the remote device in the normal manner of operation.

When detecting that the path from the PHY1 to the remote equipment fails, the service of the working member is interrupted, and an interruption alarm triggers the two selectors to synchronously start protection actions: the selector A selects the service of the selection input port 2 to be sent to the PHY1, and the selector B selects the service of the selection input port 2 to be sent to the PHY2, so that the transmission on the PHY1 is a common client, the transmission on the PHY2 is an important client, the important client service avoids a physical pipeline with faults, and the important client service is quickly recovered. When a link failure is detected, the moment that the two selectors synchronously start the protection action can be selected to be at the initial position of the FLEXE frame overhead, so that the protection action can be prevented from occurring in the middle of one frame of data, leading to the fact that the front content and the rear content of one frame of content are different members and causing erroneous judgment on frame content analysis.

At the receiving end, as shown in fig. 7B, under the condition that the member service is normal and no protection is started, PHY1 receives the service signal, and determines that the member number is 1 according to the FLEXE overhead byte content; PHY2 receives the traffic signal and determines that the member number is 255 from FLEXE overhead byte content. When the member is defined in the FLEXE protocol to recover, the members are ordered according to the size of the member numbers, the members are ordered from small to large, all time slots in the group are recombined, the member with the number 1 is in front, the member with the number 255 is in back, and the time slot arrangement relation of the transmitting end is recovered. Important customer traffic can be restored on member 1 and normal customers on member 255. When protection occurs, PHY1 receives service signals, and judges member number to be 255 through FLEXE overhead byte content; PHY2 receives the traffic signal and determines that the member number is 1 from the FLEXE overhead byte content. The members numbered 1 are in front and the members numbered 255 are in back, and all slots in the group are reorganized by sorting the member numbers from small to large. Important customer service can be recovered at member 1 and normal customer at member 255, so that the important customer service is received through PHY2, avoiding the transmission channel through PHY1, and the service is protected. For the receiving end, only the member numbers carried on each PHY need to be judged, all time slots in the group are recovered according to the sequence from small to large, the protection action does not need to be recognized and not participate in, and the receiving end still works in a normal service processing mode and is not influenced by the protection activity.

Example two

In another embodiment of the present invention, as shown in FIG. 7C, a 1:4 protection scheme is provided. 5 members are arranged in the group of the FLEXE protocol, 4 members are working channels, and the number of the members is 1, 2, 3 and 4; one is a protection channel and the member number is 255. There are 5×20=100 slots in the group, the first 80 slots (number 1-4 member number bearing) are used to bear important clients, and the last 20 slots (number 255 member number bearing) are used to bear common clients. At the transmitting end, after all members are ready for service, members 1-4 are sent to the corresponding PHY through the 1-out-of-2 selector (selector A, B, C, D), and member 255 is sent to the corresponding PHY5 through the 1-out-of-5 selector (selector E). Under the condition that all channels are normal, the selector A, the selector B, the selector C and the selector D all select the service of the input port 1 and then send the service to the PHY, and the selector E selects the service of the input port 5 to send the service to the PHY5, so that the PHY1 carries the service of the member number 1, the PHY2 carries the service of the member number 2, the PHY3 carries the service of the member number 3, the PHY4 carries the service of the member number 4, and the PHY5 carries the service of the member number 255. If one channel fails, if the channel corresponding to the PHY2 fails, after detecting a failure alarm signal and judging the alarm channel, the selector B and the selector E switch at the same time, the selector B selects the input port 2 as an input service to send to the PHY2, and the selector E selects the input port 2 as an input service to send to the PHY5, so that the PHY2 carries the service with the member number of 255, the PHY5 carries the service with the member number of 2, the PHY2 and the customer service carried on the PHY5 are replaced, the member with the number of 2 carries the important customer service, and the PHY2 channel is switched to the PHY5 channel, thereby avoiding the failure channel and realizing the service protection function. The member 255 carries the normal customer, and switches from PHY5 channel to PHY2 channel, and normal customer service goes through the failure channel, and the service can be normally delivered after failure recovery.

At the receiving end, as shown in fig. 7D, PHY1 carries the member with the number 1, PHY2 carries the member with the number 2, PHY3 carries the member with the number 3, PHY4 carries the member with the number 4, and PHY5 carries the member with the number 255 in normal times. The protocol rules are ordered from small to large according to the sequence of the member numbers, all the members in the group are recovered, and then each customer service is recovered. When the number of the client member carried in the physical channel is changed, for example, the number of the PHY2 carried is changed from the number 2 member to the number 255 member, and the number of the PHY5 carried is changed from the number 255 member to the number 2 member, the time slots in the group are recovered according to the order of the number of the client member from small to large, and the change condition of the number of the member on each physical channel does not need to be concerned.

Example III

In yet another embodiment of the present invention, as shown in FIG. 7E, a 2:3 protection scheme is provided. 5 members are arranged in the group of the FLEXE protocol, 3 members are working channels, and the number of the members is 1, 2 and 3;2 are protection channels and member numbers are 254, 255. There are 5×20=100 timeslots in the group, the first 60 timeslots (number 1-3 member number bearers) are used to carry important clients, and the last 40 timeslots (254, 255 member number bearers) are used to carry normal clients. After all members are ready for service, members 1-3 are sent to the corresponding PHY through the 1-out-of-3 selector (selector A, B, C), and members 254, 255 are sent to the corresponding PHY through the 1-out-of-4 selector (selector D, selector E). Under the condition that all channels are normal, the selector A, the selector B and the selector C select the service of the input port 1 and then send the service to the PHY, the selector D and the selector E select the service of the input port 4 and send the service to the PHY, so that the PHY1 carries the service of the member number 1, the PHY2 carries the service of the member number 2, the PHY3 carries the service of the member number 3, the PHY4 carries the service of the member number 254, and the PHY5 carries the service of the member number 255.

If 1 working channel fails, if the channel corresponding to PHY2 fails, detecting the failure alarm signal and judging the alarm channel, then deciding to start the protection action by that protection channel. If the decision result is that PHY4 protects the traffic of PHY2, then selector B and selector D switch simultaneously, selector B selects ingress port 3 to send to PHY2 as the input traffic, and selector D selects ingress port 2 to send to PHY4 as the input traffic, so that the traffic with member number 254 is carried on PHY2, the traffic with member number 2 is carried on PHY4, and the customer traffic carried on PHY2 and PHY4 is replaced. The member with the member number of 2 carries important customer service, and is switched from the PHY2 channel to the PHY4 channel through the protection action, so that a fault channel is avoided, and the service protection function is realized. The member 254 carries the normal customer, and is switched from the PHY4 channel to the PHY2 channel, and the normal customer service is passed through the fault channel and the like, and can be normally transferred after the fault recovery. At the receiving end, the business is received in a normal mode, all the members in the group are recovered according to the sequence of the member numbers from small to large, and then each customer business is recovered. When the number of the customer member carried in the physical channel is changed, the time slots are recovered according to the sequence of the number of the customer member, and the change condition of the number of the member on each physical channel is not required to be concerned.

If 2 working channels fail, such as the channel corresponding to PHY1 and PHY3 fails, after detecting the failure alarm signal and judging the alarm channel, it is necessary to decide which protection channel to start the protection action. If the decision result is that PHY4 protects PHY1 traffic, PHY5 protects PHY3 traffic. The selector a, the selector C, the selector D, and the selector E simultaneously switch, where the selector a selects the input port 3 to transmit as an input service to the PHY1, the selector C selects the input port 2 to transmit as an input service to the PHY3, the selector D selects the input port 1 to transmit as an input service to the PHY4, and the selector E selects the input port 3 to transmit as an input service to the PHY5, so that the PHY1 carries the service with the member number 254, the PHY3 carries the service with the member number 255, the PHY4 carries the service with the member number 1, the PHY5 carries the service with the member number 3, the PHY1 and the PHY4 carry the customer service with the member number 3 are replaced, and the PHY3 and the PHY5 carry the customer service are replaced. The member with the member number of 1 carries important customer service, and is switched from a PHY1 channel to a PHY4 channel through a protection action, so that a fault channel is avoided; the member with the member number of 3 carries important customer service, and is switched from the PHY3 channel to the PHY5 channel through the protection action, so that a fault channel is avoided. The member 254 carries the common customer and is switched from the PHY4 channel to the PHY1 channel; the member 255 carries the normal client thereon and switches from PHY5 channel to PHY3 channel. Normal customer service can be normally transmitted after failure recovery after failure channel is passed.

At the receiving end, as shown in fig. 7F, PHY1 carries the member with the number 1, PHY2 carries the member with the number 2, PHY3 carries the member with the number 3, PHY4 carries the member with the number 4, and PHY5 carries the member with the number 255 in normal times. The protocol rules are ordered from small to large according to the sequence of the member numbers, all the members in the group are recovered, and then each customer service is recovered. When the number of the customer member carried in the physical channel is changed, if the number of the PHY1 carried is changed from the number 1 member to the number 254 member, the number of the PHY3 carried is changed from the number 3 member to the number 255 member, and when the number of the PHY4 carried is changed from the number 254 member to the number 1 member, the number of the PHY5 carried is changed from the number 255 member to the number 3 member, the time slots in the group are recovered from small to large according to the order of the number of the customer member, and the change condition of the number of the member on each physical channel does not need to be concerned.

Based on the same or similar concept as the above embodiments, the embodiments of the present invention further provide a data transmission device, provided on a terminal, where the data transmission device includes:

In the embodiment of the invention, the selection unit judges that the working member meets the preset switching condition according to one of the following modes:

the physical channel corresponding to the working member fails;

In the embodiment of the invention, the device further comprises a setting unit, which is used for determining the working member and the corresponding physical channel, and determining the protection member and the corresponding physical channel.

the setting unit determines a working member and a corresponding physical channel, and determining a protection member and a corresponding physical channel includes: setting the number of the working members as M and the number of the protection members as N; m+n=r; m, N, R are positive integers;

In an embodiment of the present invention, the selecting unit includes:

and the exchange sub-module is used for starting a protection operation, wherein the protection operation comprises the execution of exchange between the working member and the protection member.

In the embodiment of the present invention, the exchanging sub-module starts protection operation including:

In the embodiment of the present invention, the selecting unit 30 carries the service data to each physical channel through the selecting part;

It should be noted that the above-mentioned embodiments are only for the convenience of understanding, and are not intended to limit the scope of the present invention, and any obvious substitutions and modifications made by those skilled in the art without departing from the inventive concept of the present invention are within the scope of the present invention.

Claims

1. A method of data transmission for FLEXE protocol based data transmission, the method comprising:

transmitting service data through a logic channel; wherein, the data of the first type of business is transmitted through the working member; transmitting data of the second class of service through the protection member; wherein the priority of the first type of service is higher than the priority of the second type of service; each physical channel in the logic channel is divided into working members or protection members, and each physical channel corresponds to each working member or each protection member one by one; the service data flow comprises a FLEXE overhead block which is inserted periodically; the overhead block carries member numbers corresponding to the physical channels;

When a working member meets a preset switching condition, exchanging a physical channel corresponding to the working member with a physical channel corresponding to a protection member; the interchange also includes interchange of member numbers.

2. The data transmission method according to claim 1, wherein the work member meeting a preset switching condition includes one of:

the physical channel corresponding to the working member fails;

according to the detected working member carrying channel conditions, the working member carrying channel conditions determined meet the protection operation requirements;

the working member-carried channel condition includes at least one of a channel outage, an error code violation.

3. The data transmission method according to claim 1, wherein before the transmission of the service data through the logical channel, the method further comprises:

4. A data transmission method according to claim 3, wherein the number of physical channels in the logical channel is R;

5. The method according to claim 1, wherein exchanging the physical channel corresponding to the working member with the physical channel corresponding to the protection member comprises:

6. The data transmission method of claim 5, wherein the initiating a protection operation comprises:

7. The data transmission method according to claim 4, wherein the service data is carried to each physical channel through a selection part;

the business data is divided into R paths and input to the selection unit; the M paths of data are input to the working member through the selection part, the N paths of data are input to the protection member through the selection part, the M paths of data are respectively connected to the input interface of one first selector and the input interface of each second selector, and the N paths of data are respectively connected to the input interfaces of each first selector and one second selector.

8. A data transmission apparatus for FLEXE protocol based data transmission, said apparatus comprising:

the transmission unit is used for transmitting the service data through the logic channel; wherein, the data of the first type of business is transmitted through the working member; transmitting data of the second class of service through the protection member; wherein the priority of the first type of service is higher than the priority of the second type of service; each physical channel in the logic channel is divided into working members or protection members, and each physical channel corresponds to each working member or each protection member one by one; the service data flow comprises a FLEXE overhead block which is inserted periodically, wherein the overhead block carries a member number corresponding to a physical channel;

A selection unit, configured to exchange a physical channel corresponding to a working member with a physical channel corresponding to a protection member when the working member meets a preset switching condition; wherein the interchange further includes interchange of member numbers.

9. The data transmission apparatus according to claim 8, wherein the selecting unit judges that the work member satisfies a preset switching condition according to one of:

the physical channel corresponding to the working member fails;

according to the detected working member carrying channel conditions, the working member carrying channel conditions determined meet preset starting switching requirements;

10. The data transmission apparatus according to claim 8, further comprising a setting unit configured to determine a working member and a corresponding physical channel, and determine a protection member and a corresponding physical channel.

11. The data transmission device of claim 10, wherein the data transmission device comprises a plurality of data transmission devices,

the number of physical channels in the logic channel is R;

12. The data transmission apparatus according to claim 8, wherein the selecting unit includes:

13. The data transmission apparatus of claim 12, wherein the interchange sub-module initiates a protection operation comprising:

14. The data transmission apparatus according to claim 11, wherein the selecting unit carries the service data onto the respective physical channels through the selecting section;