JP2017188753A - Method and device for changing data block arrangement - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a data block arrangement change method and a data block arrangement change device, capable of not producing a data block loss if the arrangement of the data block is changed over different transmission lines.SOLUTION: In the data block arrangement change device, a transmitter includes: a block division unit which divides client data into a plurality of data blocks; a transmission line data generation unit which generates transmission line data which includes data blocks for each transmission line; and a block duplication unit which, when changing the arrangement of the data blocks over different transmission lines, duplicates a data block of arrangement source transmission line data, to arrange the duplicated data block in the data block of the transmission line data of an arrangement destination. Also, a receiver includes a block discard unit which, when acquiring the transmission line data including the duplicated data block, discards a part of the plurality of data blocks, having an identical content, on the different transmission lines.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a data block arrangement changing method and a data block arrangement changing apparatus.

  Increasing the interface speed of Ethernet (registered trademark) is progressing with increasing communication demand. From low-speed interfaces of 1 Mb / s class per link to high-speed interfaces of 100 Gb / s class per link, various speed interfaces have been standardized along with the demand for high-speed communication lines.

  Multi-lane transmission systems have been studied in order to meet future demands for higher-speed communication lines (see Non-Patent Document 1). The multilane transmission system realizes high-speed communication lines by allocating client data to a plurality of transmission lines (multilanes) wired in parallel.

  FIG. 7 is a diagram illustrating an outline of a communication method of the multilane transmission system. In the multilane transmission system, the transmission line data generation unit 200 transfers the client data of one or more client apparatuses 100 to the transmission line data separation unit 400 via the one or more transmission lines 300. The transmission rate of client data of the client device 100 may be different for each client device 100 (for example, 10 Gb / s to 100 Gb / s). The transmission line 300 is transferred at a uniform transmission rate (for example, 100 Gb / s). The number of transmission lines 300 does not depend on the number of client devices 100 or the transmission rate of client data.

  The transmission path data generation unit 200 of the transmission device (transmission node) divides the client data of the client devices 100-1 to 100-5 into fixed-length data blocks. The transmission line data generation unit 200 multiplexes data blocks of client data by a predetermined method. Data blocks of client data of the same client device 100 may be distributed over a plurality of transmission paths 300.

  The transmission line data generation unit 200 generates block mapping information for each transmission line 300. The block mapping information is information representing the arrangement (mapping) of data blocks in the transmission path data. The arrangement of data blocks is represented by the correspondence between the block position with reference to the head of the transmission line data and the block position with reference to the head of the client data. The correspondence between the block positions is arbitrary. The transmission line data generation unit 200 generates transmission line data for each transmission line 300 by assigning a certain number of data blocks to the transmission lines 300-1 to 300-3.

  Overhead data blocks are periodically inserted into a row of client data data blocks (hereinafter referred to as “client data blocks”) in the transmission path data (main signal). The overhead data block can store block mapping information. The transmission path data generation unit 200 periodically transmits an overhead data block including block mapping information and a sequence of client data blocks of transmission path data to the receiving apparatus.

  Note that the network control device that controls the multilane transmission system may generate block mapping information. The network control device that controls the multilane transmission system may transmit the block mapping information to the transmission device and the reception device.

  The transmission path data separation unit 400 of the receiving device (receiving node) separates and multiplexes transmission path data of a plurality of transmission paths 300 in units of blocks. The transmission path data demultiplexing unit 400 restores client data based on the demultiplexed transmission path data and the block mapping information.

  FIG. 8 is a diagram illustrating a first example of a configuration of a conventional multilane transmission system. In FIG. 8, the multilane transmission system includes a transmission device (transmission node) and a reception device (reception node). The transmitting apparatus transmits block mapping information to the receiving apparatus using an overhead data block (overhead area) inserted into a sequence of client data blocks in the transmission path data.

  In FIG. 8, the transmission apparatus includes a plurality of block division units, a plurality of buffer memories, a transmission path data generation unit 200, and a plurality of overhead insertion units. The block division unit acquires client data from the client device. The block dividing unit divides the client data into a plurality of fixed-length client data blocks. The block division unit stores a plurality of client data blocks in the buffer memory of the transmission device. Thereby, the buffer memory of the transmission device can absorb the difference in the transmission rate of the client data for each client device.

  The transmission line data generation unit 200 acquires the client data block from the buffer memory in synchronization with the clock of the transmission line 300. The transmission line data generation unit 200 generates transmission line data by arranging client data blocks at predetermined block positions.

  The overhead insertion unit stores block mapping information in the overhead data block. The overhead insertion unit inserts an overhead data block into a sequence of client data blocks in the transmission path data when notifying the receiving apparatus of block mapping information using the transmission path data. The overhead insertion unit transmits transmission path data including a sequence of client data blocks and overhead data blocks to the receiving device.

  The receiving apparatus includes a plurality of overhead separators, a transmission line data separator 400, a plurality of buffer memories, and a plurality of block couplers. The overhead separator separates the data blocks of the transmission path data. The overhead separator extracts block mapping information from the overhead data block.

  The transmission line data separation unit 400 separates data blocks of transmission line data. The transmission path data separation unit 400 restores a sequence of client data blocks based on the block mapping information. The transmission path data separation unit 400 stores a sequence of client data blocks in the buffer memory of the receiving apparatus for each destination client apparatus. The block combiner restores client data by combining columns of client data blocks.

  FIG. 9 is a diagram illustrating an overhead data block storing block mapping information. The overhead data block stores block mapping information. The overhead data block may further store control information. Block positions are defined in the transmission path data. In transmission line data, one overhead data block is inserted for every six client data blocks.

  As shown in the upper part of FIG. 9, when the data length of the data block is sufficiently long, one overhead data block can store block mapping information regarding the block positions of the six client data blocks. . As shown in the lower part of FIG. 9, when the data length of the data block is not a sufficient length, one overhead data block is based on the multi-frame configuration, and the block mapping information regarding the block position of one client data block Can be stored.

  The receiving apparatus periodically extracts block mapping information from the overhead data blocks acquired periodically. The receiving apparatus can restore the client data from the transmission path data based on the block mapping information.

  The transmission line data generation unit 200 assigns a plurality of client data having different transmission speeds to the plurality of transmission lines 300 regardless of the band of the transmission line. Thereby, the transmission line data generation unit 200 can allocate a part of 100 GBASE-R as a sub-rate to, for example, client data of 10 Gb / s.

  The transmission line data generation unit 200 executes 300 Gb / s communication by logically bundling three 100 GBASE-R Ethernet (registered trademark) transmission lines 300. Thereby, the transmission line data generation unit 200 can allocate the surplus bandwidth of the physical interface to other traffic without waste. The transmission line data generation unit 200 can reduce the cost by uniformly using the transmission line 300 having a single transmission rate.

  FIG. 10 is a sequence diagram showing a procedure for switching transmission line data. In FIG. 10, the working transmission line data is transmission line data composed of three client data blocks based on the working block mapping information. In FIG. 10, the standby transmission line data is transmission line data including three client data blocks based on the standby block mapping information.

  The transmission path data generation unit 200 stores the block mapping information for the active system and the block mapping information for the standby system based on the overhead data block. The transmission path data separation unit 400 stores the working block mapping information and the standby block mapping information based on the overhead data block.

  The transmission line data generation unit 200 generates working transmission line data and standby transmission line data. In FIG. 10, the working transmission line data is data (a, b, c) in an active state. The standby transmission line data is data (d, e, f) in a standby state. Regarding the active transmission line data and the standby transmission line data, the configuration of the transmission line data is changed by switching the active state and the standby state at an arbitrary timing.

  The transmission device stores control information indicating which of the active transmission line data and the standby transmission line data is active in the overhead data block. The receiving apparatus selects the active transmission line data from the active transmission line data or the standby transmission line data based on the control information. The receiving apparatus restores the client data based on the block mapping information stored in the client data block of the selected transmission path data.

  When switching the transmission line data from the active transmission line data to the standby transmission line data, the transmission device transmits control information indicating the standby transmission line data and then transmits the standby transmission line data. The receiving apparatus selects standby block mapping information based on the control information indicating the standby transmission path data. The receiving apparatus restores the client data from the backup transmission path data based on the backup block mapping information. As a result, the working transmission line data enters a standby state. The standby transmission line data is in an active state.

  In FIG. 10, the transmission apparatus changes the working transmission line data to data (g, h, i) before transmitting control information indicating the working transmission line data. When switching the transmission line data from the standby transmission line data to the active transmission line data, the transmission device transmits control information indicating the active transmission line data and then transmits the active transmission line data. In FIG. 10, the transmission device can switch between the active transmission line data and the standby transmission line data without interrupting transmission of the transmission line data. The transmitting apparatus may arrange the client data block of the working transmission line data at an arbitrary block position of the standby transmission line data.

  FIG. 11 is a diagram illustrating an example of a transmission method of transmission path data. The transmission path data generation unit 200 acquires client data for each client device. In FIG. 11, the transmission path data generation unit 200 acquires client data including client data blocks “A1” to “A3”. The transmission path data generation unit 200 acquires client data including client data blocks “B1” and “B2”. The transmission path data generation unit 200 acquires client data including client data blocks “C1” and “C2”.

  In FIG. 11, the transmission path data generation unit 200 of the transmission apparatus transmits transmission path data including client data blocks “A1”, “B2”, “C1”, and “C2” via the transmission path 300-1. The data is transmitted to the data separator 400. The transmission line data generation unit 200 of the transmission apparatus transmits the transmission line data including the client data blocks “A2”, “A3”, and “B1” to the transmission line data separation unit 400 via the transmission line 300-2.

  FIG. 12 is a diagram illustrating an example of a transmission line data switching method. The transmission line data generation unit 200 of the transmission apparatus generates working transmission line data. Before the transmission line data is switched, the working transmission line data is in an active state. Hereinafter, a block position where a client data block is not allocated and is empty is referred to as an “empty block position”. Before the transmission line data is switched, the block position “4” of the working transmission line data transmitted via the transmission line 300-2 is an empty block position.

  The transmission line data generation unit 200 of the transmission apparatus generates backup transmission line data. The standby transmission line data is different from the active transmission line data. In the standby transmission line data, the client data block “A1” of the transmission line data transmitted via the transmission line 300-1 is the block position “4” of the transmission line data transmitted via the transmission line 300-2. Is arranged. Before the transmission line data is switched, the standby transmission line data is in a standby state.

  The transmission line data generation unit 200 of the transmission device, when the transmission line data separation unit 400 acquires block mapping information of the standby transmission line data, transmits transmission line data that is in an active state in the transmission lines 300-1 and 300-2. The active transmission line data is switched to the standby transmission line data. The transmission line data separation unit 400 switches the transmission line data that is active in the transmission lines 300-1 and 300-2 from the active transmission line data to the standby transmission line data.

  Thus, the data block arrangement changing device (transmitting device and receiving device) of the conventional multilane transmission system is arranged at the block position “1” of the transmission line data transmitted via the transmission line 300-1. The data block “A1” can be arranged at the block position “4” of transmission line data transmitted via the transmission line 300-2.

  FIG. 13 is a diagram illustrating a second example of a configuration of a conventional multilane transmission system. In FIG. 13, the multilane transmission system includes a transmission line data generation unit 200 and a transmission line data separation unit 400. The network control device 600 transmits control information indicating the active transmission line data or the standby transmission line data to the transmission device and the reception device. In FIG. 13, the overhead data block may not store the block mapping information. The network control device 600 transmits block mapping information to the transmission device and the reception device.

OIF, “Flex Ethernet Implementation Agreement”, March 2016.

  When the data block arrangement changing device changes the arrangement of client data blocks across different transmission paths, the client data block may be lost in the receiving device. When the client data block is lost in the receiving apparatus, the transmission line data separation unit 400 cannot restore the client data from the transmission line data.

  For example, in FIG. 12, only the standby transmission line data of the transmission line 300-1 of the arrangement source does not become active in the standby transmission line data in the transmission line 300-2 where the client data block “A1” is arranged. Is activated, the client data block “A1” is lost in the receiving apparatus. Since the client data block “A1” is missing in the transmission path data in the active state, the transmission path data separation unit 400 cannot restore the client data from the transmission path data in the active state.

  For example, in FIG. 12, only the standby transmission line data of the transmission line 300-1 of the arrangement source does not become active in the standby transmission line data in the transmission line 300-2 where the client data block “A1” is arranged. May become unable to absorb the delay difference in the switching timing. When the switching timing delay difference cannot be absorbed, the block mapping information used by the transmission device and the block mapping information used by the reception device become inconsistent, so that the transmission path data separation unit 400 enters the active state. Client data cannot be restored from damaged transmission line data.

  However, the data block arrangement changing device of the conventional multilane transmission system has a problem that the client data block may be lost when the arrangement of the client data block is changed over different transmission paths.

  In view of the above circumstances, the present invention provides a data block arrangement changing method and a data block arrangement changing method capable of preventing a client data block from being lost even when the arrangement of the client data block is changed over different transmission paths. The object is to provide a device.

  One aspect of the present invention is a data block arrangement changing method executed by a data block arrangement changing apparatus including a transmission device, a reception device, and a plurality of transmission lines wired in parallel between the transmission device and the reception device. The transmission device divides client data into a plurality of data blocks, generates transmission path data including the plurality of data blocks for each transmission path, and the arrangement of the data blocks in the transmission path data is different. When changing across transmission lines, the data block of the transmission path data of the placement source is duplicated, the copied data block is placed in the data block of the transmission path data of the placement destination, and the transmission path data is The transmission path data is transmitted to the receiving apparatus for each transmission path, and the receiving apparatus includes the replicated data block. If acquired, a part of the plurality of data blocks having the same contents in different transmission paths is discarded, and the data blocks remaining without being discarded are combined to restore the client data This is a data block arrangement changing method.

  One aspect of the present invention is the data block arrangement change method described above, wherein the transmission device inserts information indicating the data block to be discarded into an overhead area of the transmission path data, and the reception device includes: Based on information indicating the data block to be discarded, a part of the data blocks among the plurality of data blocks having the same content in different transmission paths is discarded.

  One aspect of the present invention is the above-described data block arrangement changing method, wherein the reception device changes the data block to be discarded from the data block in the transmission path data of the arrangement destination to the transmission path data of the arrangement source. The transmission device is notified of the switching to the data block, and when the transmission device is notified that the data block to be discarded has been switched, the transmission device stops the process of copying the data block.

  One aspect of the present invention is a data block arrangement changing device including a transmission device, a reception device, and a plurality of transmission lines wired in parallel between the transmission device and the reception device, wherein the transmission device is a client A block dividing unit for dividing data into a plurality of data blocks; a transmission line data generating unit for generating transmission line data including a plurality of the data blocks for each transmission line; and an arrangement of the data blocks in the transmission line data. A block duplication unit that duplicates the data block of the transmission path data of the placement source and places the duplicated data block in the data block of the transmission path data of the placement destination when changing across different transmission paths; A transmission unit that transmits the transmission path data to the reception apparatus for each transmission path, and the reception apparatus When the transmission path data including the data block is acquired, a block discarding unit that discards some of the data blocks among the plurality of data blocks having the same content in different transmission paths, and the remaining without being discarded A data block arrangement changing device including a block combining unit that combines data blocks to restore the client data.

  One aspect of the present invention is the data block arrangement changing device described above, wherein the transmission unit inserts information indicating the data block to be discarded into an overhead area of the transmission path data, and the block discarding unit includes: Based on the information indicating the data block to be discarded, some of the data blocks among the plurality of data blocks having the same content in the different transmission paths are discarded.

  One aspect of the present invention is the above-described data block arrangement changing device, wherein the block discarding unit allocates the data block to be discarded from the data block in the transmission path data of the arrangement destination to the transmission path of the arrangement source. The block duplication unit is notified that the data block has been switched to data, and the block duplication unit stops the process of duplicating the data block when notified that the data block to be discarded has been switched. To do.

  According to the present invention, it is possible to prevent the client data block from being lost even when the arrangement of the client data block is changed over different transmission paths.

It is a figure which shows the example of a structure of the multilane transmission system in 1st Embodiment. It is a figure which shows the example of the transmission method of the transmission line data in 1st Embodiment. It is a sequence diagram which shows the example of the switching method of transmission line data in 1st Embodiment. It is a sequence diagram which shows the example of the switching method of the transmission line data by the network control apparatus in 1st Embodiment. It is a figure which shows the example of the transmission line data and block mapping information in 2nd Embodiment. It is a sequence diagram which shows the example of the switching method of the transmission line data by the transmitter in 2nd Embodiment. It is a figure which shows the outline | summary of the communication system of a multilane transmission system. It is a figure which shows the 1st example of a structure of the conventional multilane transmission system. It is a figure which shows the overhead data block which stored block mapping information. It is a sequence diagram which shows the switching procedure of transmission line data. It is a figure which shows the example of the transmission method of transmission line data. It is a sequence diagram which shows the example of the switching method of transmission line data. It is a figure which shows the 2nd example of a structure of the conventional multilane transmission system.

Embodiments of the present invention will be described in detail with reference to the drawings.
(First embodiment)
FIG. 1 is a diagram illustrating an example of a configuration of a multilane transmission system 10. The multilane transmission system 10 is a system that transmits client data via a plurality of transmission paths. The multilane transmission system 10 includes a transmission device 20, transmission paths 30-1 to 30 -M (M is an integer of 2 or more), and a reception device 40. The multilane transmission system 10 may further include a network control device 70. The network control device 70 may be included in the transmission device 20 or the reception device 40.

  The client device 50-n (n is an integer greater than or equal to 1 and less than or equal to N. N is an integer greater than or equal to 1) is transmitted to the client via the transmission device 20, the transmission paths 30-1 to 30-M, and the reception device 40. Data is transmitted to the client device 60-n. Hereinafter, N is 3 as an example.

  The transmission device 20 (transmission node) is a communication device for transmitting transmission line data based on client data to the reception device 40 via the transmission lines 30-1 to 30-M. The transmission device 20 transmits client data to the reception device 40 via the transmission paths 30-1 to 30-M. The transmission device 20 may transmit an overhead data block including block mapping information to the reception device 40. Hereinafter, the items common to the transmission paths 30-1 to 30-M are denoted as “transmission path 30” by omitting a part of the reference numerals. Hereinafter, M is 2 as an example.

  The transmission apparatus 20 includes block division units 21-1 to 21 -N, buffer memories 22-1 to 22-N, a transmission path data generation unit 23, a block duplication unit 24, and an overhead insertion unit 25.

  Some or all of the block division unit 21, the transmission line data generation unit 23, the block duplication unit 24, and the overhead insertion unit 25 are programs stored in a storage unit by a processor such as a CPU (Central Processing Unit), for example. This is a software function unit that functions by executing. Some or all of these functional units may be hardware functional units such as LSI (Large Scale Integration) and ASIC (Application Specific Integrated Circuit).

  Hereinafter, the transmission rate (transmission rate) of client data of the client device 50-1, the transmission rate of client data of the client device 50-2, and the transmission rate of client data of the client device 50-3 may be different. Good.

  The block division unit 21-n acquires client data from the client device 50-n. The block dividing unit 21 divides client data into a plurality of fixed-length client data blocks. The block division unit 21 stores a plurality of client data blocks in the buffer memory 22-n.

  The buffer memory 22 is configured using a storage device having a nonvolatile storage medium (non-temporary recording medium) such as a magnetic hard disk device or a semiconductor storage device. The buffer memory 22 may have a volatile storage medium such as a RAM (Random Access Memory) or a register, for example. The buffer memory 22 stores a plurality of client data blocks. Thereby, the buffer memory 22 can absorb the difference in the transmission rate of the client data for each client device 50.

  The transmission line data generation unit 23 acquires a client data block from the buffer memory in synchronization with the clock of the transmission line 30. The transmission line data generation unit 23 generates block mapping information. The transmission path data generation unit 23 generates transmission path data for each transmission path 30 by arranging client data blocks at block positions determined in the generated block mapping information.

  The block duplication unit 24 duplicates an arbitrary client data block among the client data blocks of the generated transmission path data to an arbitrary empty block position in the transmission path data of the arbitrary transmission path 30.

  The overhead insertion unit 25 (transmission unit) stores block mapping information in an overhead data block. The overhead insertion unit 25 inserts an overhead data block into a sequence of client data blocks in the transmission path data when notifying the receiving device 40 of the block mapping information using the transmission path data. The overhead inserting unit 25 transmits the transmission path data including the client data block sequence and the overhead data block to the receiving device 40.

  The transmission lines 30-1 to 30-3 are communication lines wired in parallel between the transmission device 20 and the reception device 40. The transmission line 30 is, for example, an optical fiber. The transmission line 30 may be a coaxial cable, for example. The transmission line 30 transmits transmission line data generated based on the client data.

  The receiving device 40 (receiving node) is a communication device for acquiring transmission path data based on client data from the transmission apparatus 20 via the transmission paths 30-1 to 30-3. The receiving device 40 restores the client data from the transmission path data based on the block mapping information. The receiving device 40 transmits the client data restored based on the transmission path data to the client devices 60-1 to 60-N. Note that the receiving device 40 may transmit the communication data to the transmitting device 20 via the transmission paths 30-1 to 30-3.

  The receiving apparatus 40 includes an overhead separators 41-1 to 41-M, a transmission line data separator 42, a block discarder 43, buffer memories 44-1 to 44-N, and block couplers 45-1 to 45-45. -N. Some or all of the overhead separation unit 41, the transmission line data separation unit 42, and the block combination unit 45 are software function units that function when, for example, a processor such as a CPU executes a program stored in the storage unit It is. Some or all of these functional units may be hardware functional units such as an LSI or an ASIC.

  The overhead separator 41 separates the overhead data block from the transmission path data. The overhead separator 41 extracts block mapping information from the overhead data block of the transmission path data.

  The transmission line data separation unit 42 separates client data blocks of transmission line data. The transmission line data separation unit 42 (block sequence generation unit) acquires block mapping information via the transmission line 30. The transmission path data separation unit 42 generates a sequence of client data blocks based on the block mapping information. The transmission path data separation unit 42 acquires updated block mapping information via the transmission path 30. The transmission path data separation unit 42 generates a sequence of client data blocks based on the updated block mapping information.

  The block discard unit 43 acquires the transmission path data from which the overhead data blocks are separated by the overhead separation unit 41 for each transmission path 30. The block discard unit 43 discards any client data block when there is a client data block having the same content in a plurality of transmission path data transmitted via different transmission paths 30. The block discard unit 43 causes the buffer memory 44 to store a sequence of remaining client data blocks in which client data blocks having the same contents are discarded for each destination client device 60.

  The buffer memory 44 is configured using a storage device having a nonvolatile storage medium (non-temporary recording medium) such as a magnetic hard disk device or a semiconductor storage device. The buffer memory 44 may have a volatile storage medium such as a RAM or a register, for example.

  The block combining unit 45 restores client data by combining the columns of client data blocks. The block combining unit 45-n transmits the restored client data to the client device 60-n.

  The network control device 70 is an information processing device such as a server device. The network control device 70 controls communication between the transmission device 20 and the reception device 40. The network control device 70 communicates with the transmission device 20 and the reception device 40 via the control channel.

  FIG. 2 is a diagram illustrating an example of a transmission method of transmission path data. The transmission path data generation unit 23 acquires client data for each client device 50. In FIG. 2, the transmission path data generation unit 23 acquires client data including client data blocks “A1” to “A3” from the client device 50-1. The transmission path data generation unit 23 acquires client data including client data blocks “B1” and “B2” from the client device 50-2. The transmission path data generation unit 23 acquires client data including client data blocks “C1” and “C2” from the client device 50-3.

  In FIG. 2, at an arbitrary time t0, the transmission line data generation unit 23 converts the working transmission line data including the client data blocks “A1”, “B2”, “C1”, and “C2” to the transmission line 30-1. To the transmission line data separation unit 42. At an arbitrary time t0, the transmission line data generation unit 23 converts the active transmission line data including the client data blocks “A2”, “A3”, and “B1” via the transmission line 30-2. 42.

  In FIG. 2, as an example, the block duplication unit 24 uses a duplicate data block “A1” that is a duplicate of the client data block “A1” in the transmission line data of the transmission line 30-1, as transmission line data of the transmission line 30-2. Is placed at the empty block position “4”. Specifically, the block duplication unit 24 creates a duplicate data block “A1”, which is a duplicate of the client data block “A1” in the transmission line data of the transmission line 30-1, in the transmission line data of the transmission line 30-2. Arranged at block position “4”. Further, the block duplication unit 24 deletes the client data block “A1” in the transmission path data of the transmission path 30-1 from the block position “1” in the transmission path data of the transmission path 30-1.

  FIG. 3 is a sequence diagram illustrating an example of a transmission path data switching method. In FIG. 3, the standby transmission line data is different from the working transmission line data. In the standby transmission line data, the client data block “A1” of the transmission line data transmitted via the transmission line 30-1 is the block position “4” of the transmission line data transmitted via the transmission line 30-2. Is arranged. Therefore, in FIG. 3, the transmission path data of the transmission path 30-1 is the transmission path data of the arrangement source (replication source) of the client data block “A1”. The transmission path data of the transmission path 30-2 is the transmission path data of the arrangement destination (replication destination) of the client data block “A1”.

A description will be given from time t0 to time t1 shown in FIG.
The working transmission line data in the transmission line 30-1 is in an active state. The working transmission line data in the transmission line 30-2 is in an active state. The standby transmission line data in the transmission line 30-1 is in a standby state. The standby transmission line data in the transmission line 30-2 is in a standby state.

  The transmission line data generation unit 23 of the transmission apparatus 20 converts the working transmission line data including the client data blocks “A1”, “C1”, “B2”, and “C2” in the transmission line 30-1 into block mapping of the working system. Generate based on information. The transmission line data generation unit 23 arranges the client data block “A1” at the block position “1” of the working transmission line data in the transmission line 30-1.

  The transmission line data generation unit 23 of the transmission device 20 converts the working transmission line data including the client data blocks “B1”, “A2”, and “A3” in the transmission line 30-2 based on the working block mapping information. Generate. The transmission line data generation unit 23 sets the block position “4” of the working transmission line data in the transmission line 30-2 to an empty block.

  The transmission line data generation unit 23 of the transmission device 20 converts the standby transmission line data including the client data blocks “C1”, “B2”, and “C2” in the transmission line 30-1 based on the standby system block mapping information. Generate. The transmission line data generation unit 23 sets the block position “1” of the standby transmission line data in the transmission line 30-1 to an empty block.

  The transmission line data generation unit 23 of the transmission device 20 converts the standby transmission line data including the client data blocks “B1”, “A2”, “A3”, and “A1” in the transmission line 30-2 into the block mapping of the standby system. Generate based on information. The transmission line data generation unit 23 arranges a duplicate data block “A1” that is a duplicate of the client data block “A1” at the block position “4” of the standby transmission line data in the transmission line 30-2.

  When the receiving device 40 has acquired the working block mapping information, the transmission line data generation unit 23 uses the working transmission line data including the client data blocks “A1”, “C1”, “B2”, and “C2”. Is transmitted to the receiving device 40 via the transmission line 30-1. The transmission path data separator 42 of the receiving apparatus 40 transmits the working transmission path data including the client data blocks “A1”, “C1”, “B2”, and “C2” via the transmission path 30-1. Get from.

  When the receiving device 40 has acquired the working block mapping information, the transmission line data generation unit 23 converts the working transmission line data including the client data blocks “B1”, “A2”, and “A3” into the transmission line. It transmits to the receiving device 40 via 30-2. The transmission line data separation unit 42 of the reception apparatus 40 acquires the working transmission line data including the client data blocks “B1”, “A2”, and “A3” from the transmission apparatus 20 via the transmission line 30-2.

A description will be given from time t1 to time t3 shown in FIG.
The working transmission line data in the transmission line 30-1 is in an active state. The working transmission line data in the transmission line 30-2 is in a standby state. The standby transmission line data in the transmission line 30-1 is in a standby state. The backup transmission line data in the transmission line 30-2 is in an active state.

  The transmission line data generation unit 23 of the transmission apparatus 20 converts the working transmission line data including the client data blocks “A1”, “C1”, “B2”, and “C2” in the transmission line 30-1 into block mapping of the working system. Generate based on information. The transmission line data generation unit 23 arranges the client data block “A1” at the block position “1” of the working transmission line data in the transmission line 30-1.

  The transmission line data generation unit 23 of the transmission device 20 converts the working transmission line data including the client data blocks “B1”, “A2”, and “A3” in the transmission line 30-2 based on the working block mapping information. Generate. The transmission line data generation unit 23 sets the block position “4” of the working transmission line data in the transmission line 30-2 to an empty block.

  The transmission line data generation unit 23 of the transmission device 20 converts the standby transmission line data including the client data blocks “C1”, “B2”, and “C2” in the transmission line 30-1 based on the standby system block mapping information. Generate. The transmission line data generation unit 23 sets the block position “1” of the standby transmission line data in the transmission line 30-1 to an empty block.

  The transmission line data generation unit 23 of the transmission device 20 converts the standby transmission line data including the client data blocks “B1”, “A2”, “A3”, and “A1” in the transmission line 30-2 into the block mapping of the standby system. Generate based on information. The transmission line data generation unit 23 arranges a duplicate data block “A1” that is a duplicate of the client data block “A1” at the block position “4” of the standby transmission line data in the transmission line 30-2.

  When the receiving device 40 has acquired the working block mapping information, the transmission line data generation unit 23 uses the working transmission line data including the client data blocks “A1”, “C1”, “B2”, and “C2”. Is transmitted to the receiving device 40 via the transmission line 30-1. The transmission path data separator 42 of the receiving apparatus 40 transmits the working transmission path data including the client data blocks “A1”, “C1”, “B2”, and “C2” via the transmission path 30-1. Get from.

  The transmission path data generation unit 23 changes the transmission path data to be transmitted via the transmission path 30-1 from the active transmission path data to the standby system in response to the transmission path data switching command transmitted by the network control device 70 shown in FIG. Switch to transmission line data. The transmission path data switching command is a command for switching transmission path data.

  The transmission path data generation unit 23, when the receiving apparatus 40 has acquired the standby system block mapping information, includes backup system transmission path data including client data blocks “B1,” “A2,” “A3,” and “A1”. Is transmitted to the receiving device 40 via the transmission line 30-2. The transmission path data separation unit 42 of the reception apparatus 40 transmits backup transmission path data including client data blocks “B1”, “A2”, “A3”, and “A1” via the transmission path 30-2. Get from.

  Before time t1 to time t3 shown in FIG. 3, the client data block “A1” is a data block that is redundantly transmitted on the transmission path 30-1 and the transmission path 30-2. Hereinafter, client data blocks to be discarded among client data blocks whose contents are duplicated (identical) in different transmission paths are referred to as “discarded data blocks”.

  The transmission path data separation unit 42 determines the discard data block “A1” transmitted via the transmission path 30-2 from time t1 according to the data block discard command transmitted by the network control device 70 illustrated in FIG. Discard before t2. The data block discard command is a command for designating a data block to be discarded among a plurality of data blocks transmitted in duplicate. The transmission path data separation unit 42 switches the discard data block at an arbitrary time t2 before the time t1 to the time t3 in response to the discard data block switching command transmitted by the network control device 70 shown in FIG. The discard data block switching command is a command for switching a discard target among a plurality of data blocks transmitted in duplicate. The transmission line data separation unit 42 discards the discard data block “A1” transmitted via the transmission line 30-1 before the time t2 to the time t3.

A description will be given after time t3 shown in FIG.
The working transmission line data in the transmission line 30-1 is in a standby state. The working transmission line data in the transmission line 30-2 is in a standby state. The backup transmission line data in the transmission line 30-1 is in an active state. The backup transmission line data in the transmission line 30-2 is in an active state.

  The transmission line data generation unit 23 of the transmission apparatus 20 converts the working transmission line data including the client data blocks “A1”, “C1”, “B2”, and “C2” in the transmission line 30-1 into block mapping of the working system. Generate based on information. The transmission line data generation unit 23 arranges the client data block “A1” at the block position “1” of the working transmission line data in the transmission line 30-1.

  The transmission line data generation unit 23 of the transmission device 20 converts the working transmission line data including the client data blocks “B1”, “A2”, and “A3” in the transmission line 30-2 based on the working block mapping information. Generate. The transmission line data generation unit 23 sets the block position “4” of the working transmission line data in the transmission line 30-2 to an empty block.

  The transmission line data generation unit 23 of the transmission device 20 converts the standby transmission line data including the client data blocks “C1”, “B2”, and “C2” in the transmission line 30-1 based on the standby system block mapping information. Generate. The transmission line data generation unit 23 sets the block position “1” of the standby transmission line data in the transmission line 30-1 to an empty block.

  The transmission line data generation unit 23 of the transmission device 20 converts the standby transmission line data including the client data blocks “B1”, “A2”, “A3”, and “A1” in the transmission line 30-2 into the block mapping of the standby system. Generate based on information. The transmission line data generation unit 23 arranges a duplicate data block “A1” that is a duplicate of the client data block “A1” at the block position “4” of the standby transmission line data in the transmission line 30-2.

  When the receiving device 40 completes switching of the discard data block, the transmission line data generation unit 23 converts the standby transmission line data including the client data blocks “C1”, “B2”, and “C2” into the transmission line 30-1. To the receiving device 40. The transmission path data separation unit 42 of the reception apparatus 40 acquires backup transmission path data including client data blocks “C1”, “B2”, and “C2” from the transmission apparatus 20 via the transmission path 30-1.

  When the receiving device 40 completes switching of the discard data block, the transmission line data generation unit 23 transmits the standby transmission line data including the client data blocks “B1”, “A2”, “A3”, and “A1”. It transmits to the receiving device 40 via the path 30-2. The transmission path data separation unit 42 of the reception apparatus 40 transmits backup transmission path data including client data blocks “B1”, “A2”, “A3”, and “A1” via the transmission path 30-2. Get from.

  Therefore, in the standby transmission line data shown in FIG. 3, the block position where the client data block “A1” is arranged is based on the block position of the transmission line data in the transmission line 30-1, as compared with the active transmission line data. The block position of the transmission line data in the transmission line 30-2 is changed.

  FIG. 4 is a sequence diagram illustrating an example of a transmission path data switching method by the network control device 70. At time t0, the transmission device 20 transmits the working transmission line data to the reception device 40 via the transmission line 30-1 (step S101). At time t0, the transmission device 20 transmits the working transmission line data to the reception device 40 via the transmission line 30-2 (step S102).

  Prior to time t1 from time t0, the network control device 70 transmits a transmission line data switching command to the transmission device 20 that is transmitting the working transmission line data via the transmission line 30-2 (step S103). Prior to time t1 from time t0, the network control device 70 transmits a data block discard command to the receiving device 40 that has acquired the working transmission line data via the transmission line 30-2 (step S104).

  At time t1, the transmission device 20 transmits the standby transmission line data to the reception device 40 via the transmission line 30-2 based on the transmission line data switching command (step S105). From time t1 to time t2, the receiving device 40 discards the discard data block based on the data block discard replacement command. Prior to time t1 to time t2, the network control device 70 transmits a discard data block switching command to the receiving device 40 (step S106).

  At time t2, the receiving device 40 switches the discard data block from the client data block in the transmission path 30-2 to the client data block in the transmission path 30-1 based on the discard data block switching command (step S107). Prior to time t2 to time t3, the network control device 70 transmits a transmission line data switching command to the transmission device 20 that is transmitting the working transmission line data via the transmission line 30-1 (step S108). At time t3, the transmission device 20 transmits the standby transmission line data to the reception device 40 via the transmission line 30-1 based on the transmission line data switching command (step S109).

  In step S103 and step S108, the network control device 70 transmits a transmission path data switching command for each transmission path 30. The network control device 70 collects transmission line data for a plurality of transmission lines 30 by keeping the same contents of the working transmission line data and the standby transmission line data that are not changed across transmission lines having different data block arrangements. A switching command may be transmitted.

  As described above, the multilane transmission system 10 (data block arrangement changing device) according to the first embodiment includes the transmission device 20, the transmission path 30, and the reception device 40. The transmission device 20 includes a block division unit 21, a transmission path data generation unit 23, a block duplication unit 24, and an overhead insertion unit 25. The receiving device 40 includes a block discard unit 43 and a block combination unit 45. The block dividing unit 21 divides client data into a plurality of data blocks. The transmission line data generation unit 23 generates transmission line data including a plurality of data blocks for each transmission line. When the arrangement of the data blocks in the transmission line data is changed across different transmission lines 30, the block duplicating unit 24 duplicates the data block of the transmission path data of the arrangement source, and the copied data block is the transmission path data of the arrangement destination. Placed in the data block. The overhead insertion unit 25 transmits the transmission path data to the receiving device 40 for each transmission path 30. The block discard unit 43 discards some data blocks among a plurality of data blocks having the same content in different transmission paths when the transmission path data including the replicated data block is acquired. The block combining unit 45 combines the data blocks that remain without being discarded, and restores the client data.

  As a result, the multilane transmission system 10 (data block arrangement changing device) of the first embodiment can prevent the client data block from being lost even when the arrangement of the client data block is changed over different transmission paths. Become.

  The data block arrangement changing device according to the first embodiment can dynamically change the configuration of transmission path data in accordance with a change in the bandwidth of client data. The data block arrangement changing device of the first embodiment can systematically switch the transmission line 30 according to the deterioration of the transmission quality of transmission data in the transmission line 30. The data block arrangement changing device of the first embodiment can systematically switch the transmission path 30 according to the client data accommodation status. The data block arrangement changing device according to the first embodiment can change the arrangement of client data blocks across different transmission paths even in a communication service in which loss of client data blocks is not allowed.

(Second Embodiment)
The second embodiment is different from the first embodiment in that the transmission device 20 notifies the reception device 40 of the block position information of the discarded data block using the block mapping information. In the second embodiment, only differences from the first embodiment will be described.

  FIG. 5 is a diagram illustrating an example of transmission path data and block mapping information. 3 to 5, the client data block at the block position “1” of the working transmission line data in the transmission line 30-2 is “B1”. The client data block at the block position “2” of the working transmission line data in the transmission line 30-2 is “A2”. The client data block at the block position “2” of the working transmission line data in the transmission line 30-3 is “A3”. The client data block at the block position “4” of the working transmission line data in the transmission line 30-2 is an empty block.

  In the block mapping information (working block mapping information) of the working transmission line data in the transmission line 30-2, the block position, the client data block, and the discard flag are associated with each other. The discard flag is flag information indicating a client data block to be discarded. The value of the discard flag associated with the block position of the client data block that is the discard data block is 1. The value of the discard flag associated with the block position of the client data block that is not the discard data block is 0.

  In FIG. 3, FIG. 4, and FIG. 5, the client data block at the block position “1” of the backup transmission line data in the transmission line 30-2 is “B1”. The client data block at the block position “2” of the standby transmission line data in the transmission line 30-2 is “A2”. The client data block at the block position “3” of the standby transmission line data in the transmission line 30-2 is “A3”. The client data block at the block position “4” of the backup transmission line data in the transmission line 30-2 is the discard data block “A1”. Before the time t1 to the time t2 shown in FIGS. 3 and 4, the duplicate data block “A1” of the backup transmission line data in the transmission line 30-2 is a discard data block.

  In block mapping information (backup block mapping information) of backup transmission path data in the transmission path 30-2, block positions, client data blocks, and discard flags are associated with each other. The block discard unit 43 discards the client data block whose discard flag value is 1 as a discard data block.

  FIG. 6 is a sequence diagram illustrating an example of a transmission line data switching method by the transmission apparatus. At time t <b> 0, the transmission device 20 transmits the working block mapping information and the working transmission line data to the receiving device 40 via the transmission line 30-1. The working block mapping information in the transmission line 30-1 includes a discard flag “0” (step S201).

  At time t0, the transmission device 20 transmits the current system block mapping information and the current transmission channel data to the reception device 40 via the transmission channel 30-2. The block mapping information for the active system in the transmission line 30-2 includes a discard flag “0” (step S202).

  Prior to time t0 from time t0, the network control device 70 transmits a transmission path data switching command to the transmission device 20 that is transmitting the working transmission line data via the transmission path 30-2 (step S203).

  At time t <b> 1, the block duplicating unit 24 of the transmitting device 20 transmits the standby block mapping information and the standby transmission line data to the receiving device 40 via the transmission line 30-2. The block duplicating unit 24 of the transmission device 20 sets the value of the discard flag associated with the block position of the discard block to 1 in the backup block mapping information in the transmission path 30-2.

  At time t1, the block discarding unit 43 of the receiving device 40 discards the discard block at the block position associated with the discard flag having a value of 1 in the protection block mapping information from the protection transmission path data ( Step S204).

  At time t <b> 2, the block duplicating unit 24 of the transmission device 20 transmits the standby block mapping information and the standby transmission line data to the reception device 40 via the transmission line 30-2. The block duplication unit 24 of the transmission device 20 switches the transmission path 30 for transmitting the transmission path data in which the discard data block is arranged. That is, the block duplicating unit 24 of the transmission device 20 sets the value of the discard flag associated with the block position of the discard block to 1 in the working block mapping information in the transmission path 30-1. The block duplicating unit 24 of the transmission device 20 may return the value of the discard flag to 0 in the backup block mapping information in the transmission line 30-2.

  At time t2, the block discarding unit 43 of the receiving device 40 discards the discard block at the block position associated with the discard flag “1” in the working block mapping information from the working transmission line data (step S205). ).

  Prior to time t2 to time t3, the block discarding unit 43 of the receiving device 40 transmits a switch completion notification to the block duplicating unit 24 of the transmitting device 20. The switch completion notification is a notification indicating that the process of switching the transmission path 30 for acquiring the transmission path data in which the discard data block is arranged is completed. The switch completion notification may be included in a part of the overhead data block of the main signal transmitted from the reception device 40 to the transmission device 20 (step S206).

  In addition, before the time t2 to the time t3, the block duplication unit 24 of the transmission device 20 receives the block completion information for the standby system in the transmission line 30-2 when the block duplication unit 24 obtains the switch completion notification from the reception device 40. In this case, the value of the discard flag may be returned to 0.

  At time t <b> 3, the transmission device 20 transmits the standby block mapping information and the standby transmission line data to the reception device 40 via the transmission line 30-1. The block mapping information for the standby system in the transmission line 30-1 includes a discard flag “0” (step S207).

  As described above, the overhead insertion unit 25 according to the second embodiment inserts the discard flag into the overhead data block (overhead area) of the transmission path data. Based on the discard flag, the block discard unit 43 discards some discarded data blocks among the client data blocks having the same contents in different transmission paths 30.

  Accordingly, the transmission device 20 and the reception device 40 of the second embodiment can autonomously discard the discard data block. For example, the transmission device 20 and the reception device 40 of the second embodiment can discard the discard data block without obtaining a block discard command from the network control device 70. For example, the transmission device 20 and the reception device 40 of the second embodiment can discard the discarded data block even if the number of times of obtaining the block discard command from the network control device 70 is reduced.

  The block discard unit 43 notifies the transmission device 20 that the discard data block has been switched from the data block in the transmission path data at the placement destination to the data block in the transmission path data at the placement source. When notified that the data block to be discarded has been switched, the block replication unit 24 stops the process of replicating the discarded data block. Accordingly, the transmission device 20 and the reception device 40 of the second embodiment can autonomously discard the discard data block.

  You may make it implement | achieve at least one part of the multilane transmission system and data block arrangement | positioning change apparatus in embodiment mentioned above with a computer. In that case, a program for realizing this function may be recorded on a computer-readable recording medium, and the program recorded on this recording medium may be read into a computer system and executed. Here, the “computer system” includes an OS and hardware such as peripheral devices. The “computer-readable recording medium” refers to a storage device such as a flexible medium, a magneto-optical disk, a portable medium such as a ROM and a CD-ROM, and a hard disk incorporated in a computer system. Furthermore, the “computer-readable recording medium” dynamically holds a program for a short time like a communication line when transmitting a program via a network such as the Internet or a communication line such as a telephone line. In this case, a volatile memory inside a computer system serving as a server or a client in that case may be included and a program held for a certain period of time. Further, the program may be a program for realizing a part of the above-described functions, and may be a program capable of realizing the functions described above in combination with a program already recorded in a computer system. You may implement | achieve using programmable logic devices, such as FPGA (Field Programmable Gate Array).

  The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and includes designs and the like that do not depart from the gist of the present invention.

DESCRIPTION OF SYMBOLS 10 ... Multilane transmission system, 20 ... Transmission apparatus, 21 ... Block division part, 22 ... Buffer memory, 23 ... Transmission path data generation part, 24 ... Block duplication part, 25 ... Overhead insertion part, 30 ... Transmission path, 40- 40d: receiving device, 41: overhead separating unit, 42: transmission line data separating unit, 43 ... block discarding unit, 44 ... buffer memory, 45 ... block combining unit, 60 ... client device, 70 ... network controller, 100 ... client 200 ... Transmission path data generation unit, 300 ... Transmission path, 400 ... Transmission path data separation unit, 500 ... Client device, 600 ... Network control device

Claims (6)

A data block arrangement changing method executed by a data block arrangement changing apparatus comprising a transmitting device, a receiving device, and a plurality of transmission lines wired in parallel between the transmitting device and the receiving device,
The transmitter is
Divide client data into multiple data blocks,
Generating transmission path data including a plurality of the data blocks for each transmission path;
When the arrangement of the data block in the transmission line data is changed across different transmission lines, the data block of the transmission line data of the arrangement source is duplicated, and the duplicated data block is transferred to the transmission line data of the arrangement destination Arranged in the data block of
Transmitting the transmission path data to the receiving device for each transmission path;
The receiving device is:
When acquiring the transmission path data including the replicated data block, discard some of the data blocks among the plurality of data blocks that are the same content in different transmission paths,
Combine the data blocks that remain without being discarded and restore the client data;
Data block layout change method. The transmitting device inserts information indicating the data block to be discarded into an overhead area of the transmission line data,
2. The receiving device according to claim 1, wherein, based on information indicating the data block to be discarded, a part of the plurality of data blocks having the same content in the different transmission paths is discarded. Data block layout change method. The receiving apparatus notifies the transmitting apparatus that the data block to be discarded has been switched from the data block in the transmission path data of the arrangement destination to the data block in the transmission path data of the arrangement source,
3. The data block arrangement changing method according to claim 1, wherein, when notified that the data block to be discarded has been switched, the transmitting device stops the process of copying the data block. A data block arrangement changing device comprising a transmission device, a reception device, and a plurality of transmission lines wired in parallel between the transmission device and the reception device,
The transmitter is
A block dividing unit for dividing client data into a plurality of data blocks;
A transmission line data generation unit for generating transmission line data including a plurality of the data blocks for each transmission line;
When the arrangement of the data block in the transmission line data is changed across different transmission lines, the data block of the transmission line data of the arrangement source is duplicated, and the duplicated data block is transferred to the transmission line data of the arrangement destination A block duplicating unit arranged in the data block of
A transmission unit that transmits the transmission path data to the reception device for each transmission path;
The receiving device is:
A block discarding unit that discards some of the data blocks among the plurality of data blocks having the same content in different transmission paths when the transmission path data including the replicated data blocks is acquired;
A block combining unit that combines the data blocks remaining without being discarded and restores the client data;
Data block layout change device. The transmitter inserts information indicating the data block to be discarded into the overhead area of the transmission line data,
The block discard unit discards some of the data blocks among a plurality of the data blocks having the same content in different transmission paths, based on information indicating the data blocks to be discarded. The data block arrangement changing device described. The block discarding unit notifies the block duplicating unit that the data block to be discarded has been switched from the data block in the transmission path data of the placement destination to the data block in the transmission path data of the placement source,
The data block arrangement changing device according to claim 4 or 5, wherein, when notified that the data block to be discarded is switched, the block duplicating unit stops the process of duplicating the data block.

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