JP2002305550A - Transmission method for control data, transmission node device, reception method for control data, reception node device, communication method for control data, communication system and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To distinguish a received control information code set as to whether it is a pseudo control information set or a control information code set from a transmission node. SOLUTION: A transmitter side adopts an inspection pattern generating method, which receives M-sets of inspection patterns N-M, N-M+1,..., N-1 (N is M+1 or more) and generates an inspection pattern N, generates an inspection pattern I using inspection patterns 1, 2,..., M for initial values, configures control information I with control data I and the inspection pattern I, and transmits control information code set I obtained by coding the control information I to a receiver side. The receiver side decodes the received control information code set J (J=1, 2, etc.), into the control information J, separates the information J into control data J and an inspection pattern J, adopts the inspection pattern generating method to generate reference patterns J-P, J-P+1,..., J by using inspection patterns J-P-M, J-P-M+1,..., J-P-1 for initial values when J is (P+M) or over (P is an integer of 0 or over), and conducts control information reception processing according to a difference between the reference patterns and the inspection patterns J-P, J-P+1,..., J.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmission method, a reception method, a communication method, and a communication method for communicating control information for performing maintenance and operation monitoring separately from packets in a communication system for communicating packets. The present invention relates to a system, a transmission node device, a reception node device, and a program executed by a computer in each device, and in particular, for ensuring the validity of received control data.

[0002]

2. Description of the Related Art A technique related to the present invention is disclosed in, for example, Japanese Patent Application No. 2000-117027. First, an embodiment disclosed in the earlier application will be described with reference to FIGS. FIG. 25 shows an integrated network A1 connecting an existing synchronous communication system 7 and a new communication system 7 'of a new protocol having a different communication system from the existing synchronous communication system 7.
An embodiment will be described. This integrated network A1 is composed of a synchronous communication system 7, a new communication system 7 ', and a communication system conversion node A2 connecting these.

[0005] The synchronous communication system 7 and the new communication system 7 ′ are each provided with a network operation unit 200. The network operation unit 200 processes the control information 3 and the control information 3 ′ according to the control information processing method 6 based on the SDH frame overhead processing method, as described later. The synchronous communication system 7 uses the communication unit 50 to communicate the communication data 2 and the control information 3 for operation and maintenance of the communication system in accordance with the synchronous frame communication system 5, which is a communication system using an SDH frame.

FIG. 26A shows the structure of a signal transmitted by the synchronous frame communication system 5, and FIG. 26B shows the frame structure of the synchronous frame communication system 5. FIG. 26 (a)
As shown in (1), in the synchronous frame method 5, the communication data 2 and the control information 3 are transmitted and received using the frame having the frame structure 1 conforming to the SDH continuously at the interval of the frame time 4 of 125 μs.

[0005] As shown in FIG.
M is all or a part of each byte of the repeater section overhead, each byte of the terminal section overhead, and each byte of the higher-order path overhead.
Bytes (m is a natural number) of control information bytes 8-1 to 8-m
Consists of The control information processing method 6, which is a processing method of the control information 3 for performing operation and maintenance, conforms to the SDH frame overhead processing method.

FIG. 27 is an example of a timing chart of signals for performing communication in the new communication system 7 '. The new communication system 7 ′ uses the communication unit 50 ′ to communicate data 2 ′ and control information 3 ′ during a frame time 4 of 125 μs by a communication system 5 ′ different from the synchronous frame communication system 5.
M control information blocks 8B-1 'to 8B-, where one block is composed of K (K is a natural number) codes
m '. The control information block 8B-i '(i is 1 to m) includes a code representing a control information byte 8-i' corresponding to the control information byte 8-i. Each block is
It includes control information identification bits C1 and C2 composed of one bit or a plurality of bits for identifying the type of the control information byte included in this.

[0007] In the transmission of the control information block 8B-i ', using the period during which the communication data 2' is not transmitted,
The transmission of the m control information blocks 8B-1 ′ to 8B-m ′ is completed during the frame time 4 (125 μs). 125
Frame timings are generated at intervals of μs, and transmission is started sequentially from the control information block 8B-1 ′ according to the timings. The transmission of the control information block corresponding to the next frame is not started from the time when the transmission is completed up to 8B-m 'until the next frame timing.

In receiving the control information block 8B-i ', a control information block including a control information identification bit indicating the control information byte 8-1' is detected, and a jitter component is removed from the detection timing to reduce the frame timing. Reproduce. When the control information identification bit of the received control information block indicates the control information byte 8-i ', the control information byte 8-i' is obtained from the block.
Control information blocks 8B-2 'to 8B- to be received
If the control information block 8B-j 'is not received among m', it is determined that a code error has occurred in the control information byte 8-j 'during transmission, and predetermined error processing is performed.
As the control information processing method for the control information byte 8-i 'for performing operation and maintenance of the new communication system 7', the control information processing method 6 of the synchronous communication system 7 is applied.

Therefore, according to the new communication system 7 'to which the communication system according to the present embodiment is applied, the control information of the existing synchronous communication system 7 is made common, and the communication speed of the control information is adjusted so that the existing synchronous communication system 7 can communicate. A virtual frame equivalent to a communication system frame is realized.

As a result, the control information processing system 6 of the existing synchronous communication system 7 can be used as it is in a new communication system 7 'to which the communication system according to the present embodiment is applied. Further, in the integrated network in which the existing synchronous communication system 7 and the new communication system 7 'to which the communication system according to the present embodiment is applied can be unified to the control information processing system 6, the operation of the integrated network can be performed by the existing network. This can be realized in the same manner as when only the synchronous communication system 7 is used. This embodiment is suitable for use in packet communication such as a bus-type LAN (local area network).

In transmitting the control information 3 'of the new communication system 7', m control information blocks 8B-1 'to 8
Of the BM ', the control information block 8B-i' that matches the default value may not be transmitted. In that case, in receiving the control information 3 ′,
It is detected that the control information block 8B-i 'has not been received at a predetermined time, and when this is detected, processing is performed in the same manner as when the control information block 8B-1' matching the default value is received.

The present embodiment is not limited to the SDH as the existing synchronous communication system 7, and can be applied to other communication systems that perform synchronous communication using SONET or another frame.

According to the technique described above, there is provided a synchronous frame communication system for communicating a frame signal including communication data and first control information having an n-bit length and having a predetermined frame structure at predetermined frame time intervals. For a communication system that uses a first communication method and a control information processing method that processes the first control information, a second communication method that is a communication method different from the first communication method is used. Communicating a signal including communication data and second control information having an N (> n) bit length at the predetermined frame time interval,
At this time, since the second control information including the first control information is communicated at the predetermined frame time interval,
Since the control information required by the control information processing method of the existing synchronous communication system is communicated by a virtual frame equivalent to the frame of the existing synchronous communication system, the control information processing method of the existing synchronous communication system is directly used. It will be possible to adopt it.

Furthermore, in an integrated network in which an existing synchronous communication system and a communication system to which the communication method of the present embodiment is applied coexist, the control information processing method can be unified. The present invention can be realized in the same manner as when only the communication system is used.

Next, a packet communication system which is a premise of an embodiment of the present invention described later will be described with reference to FIGS. In FIG. 28A, the packet communication system includes a transmitting node 100 and a receiving node 300. The transmission node 100 has a packet output unit 10 and a transmission unit 11. The transmission node 100 is provided, for example, in the synchronous communication system 7 of FIG. The receiving node 300 has a packet output unit 30 and a transmission unit 31. The receiving node 300 is provided, for example, in the new communication system 7 'of FIG. Note that the transmitting node 100 and the receiving node 300 can be applied to other packet communication systems.

The packet output unit 10 outputs a packet signal shown in FIG. 28 (b), and the transmission unit 11 generates control information for monitoring operation and maintenance, and controls an idle code set described later included in the packet signal. The information is replaced with a coded control information code set, and the information is replaced with the packet signal in FIG.
The signal is transmitted to the transmission line as a transmission line signal shown in FIG. The receiving unit 31 receives the transmission path signal, decodes the control information code set into control information, uses it for maintenance operation monitoring, and replaces the control information code set with an idle code set. The packet input unit 30 inputs a packet signal.

In FIG. 28 (c), reference numeral 12 denotes an idle code set, which is a code set composed of four codes that fill the space between packets. Reference numeral 13 denotes a packet start / end code set which is a code set added immediately before / after the packet. A control information code set 14 is composed of a special code for identification and three data codes obtained by coding the control information.

FIG. 28D shows a control information code set 14 obtained by encoding control information.
It consists of four parts B, C and D. A is a control information identification signal, which is a special code not used except for the control information code set. B to D are control information codes.
Are encoded into data codes.

FIG. 29 is a block diagram and a timing chart showing the configuration and operation of the transmitting section 11. (A) shows a configuration, and an idle code set detection unit 15 detects an idle code set (four code strings of a fixed pattern) included in the packet signal of (b) output from the packet output unit 10, The detection signal of (c) is output. The control information transmitting section 16 generates and outputs the control information 1, 2, 3, 4,... Of (e) for maintenance and operation monitoring of the packet communication system. Further, when the control information is ready to be transmitted, it receives the detection signal and outputs the replacement signal (d). Note that, in order to generate the control information, various types of information from outside the transmission unit 11 may be input. The control information encoding unit 17 encodes the generated control information into control information code sets 1, 2, 3, 4,.

The idle code set-control information code set replacing section 18 receives the above-mentioned replacement signal, replaces the idle code set included in the packet signal with the control information code set, and transmits the in-apparatus transmission path signal (for example, electric parallel signal). Signal). The interface conversion unit 19 converts the transmission line signal in the device into, for example, an optical serial signal and outputs it as the transmission line signal (g).

FIG. 30 is a block diagram and a timing chart showing the configuration and operation of the receiving section 31. (A) shows the configuration, and the interface conversion unit 32 converts the optical serial signal of the transmission line signal shown in (g) into, for example, an electric parallel signal and outputs it as an intra-device transmission line signal. The control information code set detection unit 33 detects the control information code set from the intra-device transmission path signal, and outputs a detection signal shown in (f). The control information decoding unit 34 decodes and outputs the control information code set shown in (e) to the control information shown in (d), and outputs the received signal shown in (c). The control information receiving unit 35 receives the control information and the received signal, and performs various processes for maintenance and operation monitoring of the packet communication system. Note that various alarms may be output to the outside of the receiving unit for maintenance operation monitoring. The control information code set-idle code set replacement section 36 receives the detection signal, replaces the control information code set included in the intra-device transmission line signal with an idle code set, and outputs the result to the packet input section 30.

[0022]

However, the packet communication system shown in FIGS.
There is the following problem described with reference to FIG. FIG.
In (a), when the transmission transmission path signal shown in FIG. 31B is transmitted from the transmission node 100, a failure occurs in the transmission path, and the reception transmission path signal received by the reception unit 31 of the reception node 300 is undefined. (Random pattern)
A part of the random pattern may be a pattern (pseudo control information code set) that can be stochastically regarded as a control information code set. Therefore, as shown in FIG. 31 (c), a pseudo control information code set including a special code for identifying the control information code set appears in the received transmission path signal of the random pattern.

According to the above-described technique, the receiving node 300 determines whether the pseudo control information code set is
The control information code set transmitted from 00 cannot be distinguished. Therefore, maintenance and operation monitoring is performed based on erroneous control data obtained by decoding the pseudo control information code set, and a first problem that a serious problem may occur in the packet communication system. was there.

In FIG. 32 (a), when transmitting a packet filled with a pattern that changes to a pseudo control information code set only by inverting a specific bit, the pseudo control is stochastically caused by a code error during transmission. An information code set is generated. This can occur due to the presence of a malicious user trying to cause a problem in the communication system, even if the code error rate is of a level that is practically acceptable. FIG.
(B) shows a packet in which a specific one bit is inverted by a malicious user and filled with a pattern changed to a pseudo control information code set. FIG. 32C shows a reception transmission line signal including a pseudo control information code set generated by a code error on the transmission line.

According to the above-described presupposed technique, the receiving node 300 cannot distinguish between the pseudo control information code set and the control information code set transmitted from the transmitting node 100. In the same manner as the problem described above, the maintenance and operation monitoring is performed based on the erroneous control data obtained by decoding the pseudo control information code set, and a serious problem may occur in the packet communication system. There were two problems.

As a countermeasure against the second problem, it is conceivable to lengthen the bit length of a pattern (such as a special code dedicated to the control information code set) for authenticating the control information code set. A great effect cannot be obtained in reducing the probability of receiving the pseudo control information code set.

The present invention has been made to solve the above problem, and distinguishes whether a received control information code set is a pseudo control information code set or a control information code set from a transmitting node. The purpose is to be able to.

[0028]

In order to achieve the above object, a method for transmitting control data according to the present invention comprises:
Control information I (I) including control data for maintenance operation monitoring
= 1, 2, 3,...) And the control information code set I
, And the control information code I set is communicated during a period in which no packet is communicated. In a method of transmitting control data in a packet communication system, M check patterns NM, NM + 1,. When N-1 (M is a natural number and N is a natural number equal to or greater than M + 1) is given, the inspection pattern generation method is capable of generating the inspection pattern N, and the inspection patterns 1, 2,. A pattern I is generated, the control information I is composed of the control data I and the test pattern I, the control information I is encoded and converted into a control information code set I, and the control information code set I is transmitted. ing.

Further, in the control data transmitting node device according to the present invention, the control information I (I = 1, 2, 3,...) Including the control data for maintenance and operation monitoring is encoded into the control information code set I. In the transmitting node device in the packet communication system in which the control information code I set is communicated during a period in which no packet is communicated, M check patterns NM, NM + 1,.
When M (1 is a natural number and N is a natural number equal to or greater than M + 1), the test pattern I is set to an initial value using the test patterns 1, 2, ..., M by a test pattern generation method capable of generating the test pattern N. Test pattern generating means for generating the control information I, control means I comprising control data I and test pattern I, coding means for coding the control information I and converting it into a control information code set I; Transmission means for transmitting I.

In the control data receiving method according to the present invention, control information I (I = 1, 2, 3,...) Including control data for maintenance operation monitoring is encoded and converted into a control information code set I. In a method of receiving control data in a packet communication system in which the control information code I set is communicated during a period in which no packet is communicated, the transmitting side includes M check patterns NM, NM +
, N-1, where M is a natural number and N is a natural number equal to or greater than M + 1, the test pattern generation method that can generate the test pattern N
An inspection pattern I is generated with 2,..., M as initial values, and the control information I is composed of the control data I and the inspection pattern I,
The control information code set I transmitted by encoding the control information I is received, and the received control information code set J (J =
, 1, 2, 3,...) Are decoded into control information J, and the control information J is separated into control data J and test patterns J, where J is P + M
In the case where P is an integer greater than or equal to 0, the inspection patterns JPM, JPM +
,..., JP-P-1 as initial values, the reference pattern J-
P, J−P + 1,..., J and generate the reference pattern J−
P, JP-P + 1,... J and inspection patterns JP, JP-P +
, J, and a predetermined control information receiving process is performed according to the difference.

In the receiving node device according to the present invention,
Control information I (I) including control data for maintenance operation monitoring
= 1, 2, 3,...) And the control information code set I
In the receiving node device in the packet communication system in which the control information code I set is communicated during a period in which no packet is communicated, the M-side test patterns NM, NM + 1, …, N-
When M (1 is a natural number and N is a natural number equal to or greater than M + 1), the test pattern I is set to an initial value using the test patterns 1, 2, ..., M by a test pattern generation method capable of generating the test pattern N. , And the control information I is composed of the control data I and the test pattern I. The receiving means for receiving the control information code set I which has been transmitted by encoding the control information I, and the received control information code set J ( J = 1,
2, 3,...) Into control information J, and decoding / separating means for separating the control information J into control data J and a test pattern J. When J is P + M or more (P is an integer of 0 or more), The inspection pattern JPM,
Reference pattern generating means for generating reference patterns JP, JP + 1,..., J with JP-M + 1,..., JP-1 as initial values, and reference patterns JP, JP + 1,.
There is provided a reception processing means for obtaining a difference between J and the inspection pattern JP, JP-P + 1,... J, and performing a predetermined control information receiving process according to the difference.

In the control data communication method according to the present invention, control information I (I = 1, 2, 3,...) Including control data for maintenance and operation monitoring is encoded and converted into a control information code set I. In a communication method of control data in a packet communication system in which the control information code I set is communicated during a period in which no packet is communicated, M transmission patterns NM, NM +
, N-1, where M is a natural number and N is a natural number equal to or greater than M + 1, the test pattern generation method that can generate the test pattern N
An inspection pattern I is generated with 2,..., M as initial values, and the control information I is composed of the control data I and the inspection pattern I,
The control information I is encoded and converted into a control information code set I. The control information code set I is transmitted, and the received control information code set J (J = 1, 2,
(3,...) Are decoded into control information J, and the control information J is separated into control data J and test patterns J, and J is equal to or more than P + M (P
Is an integer greater than or equal to 0), the inspection patterns JPM, JPM + 1,.
Reference patterns JP and JP + with -P-1 as an initial value
1,..., J and generate reference patterns JP, JP-P +
, J and the test patterns JP, JP + 1,... J are determined, and a predetermined control information receiving process is performed according to the differences.

In the control data communication system according to the present invention, control information I (I = 1, 2, 3,...) Including control data for maintenance operation monitoring is encoded and converted into a control information code set I. , N in the control data communication system in the packet communication system in which the control information code I set is communicated during a period in which no packet is communicated.
When −1 (M is a natural number and N is a natural number equal to or more than M + 1) is given, the test pattern generation method is capable of generating the test pattern N, and the test pattern 1, 2,. Test pattern generating means for generating I, coding means for forming the control information I with control data I and test pattern I, coding the control information I and converting it into a control information code set I, A transmitting node device provided with transmitting means for transmitting the code set I,
Receiving means for receiving control information J (J = 1, 2, 3,...); Decoding the received control information code set J into control information J; and separating control information J into control data J and test pattern J And J-P-M, J-P-M + 1,..., J-P-1 by the check-pattern generation method when J is equal to or greater than P + M (P is an integer equal to or greater than 0). Reference patterns JP, JP + 1,..., J as initial values
Reference pattern generation means for generating a reference pattern J-
P, JP-P + 1,... J and inspection patterns JP, JP-P +
.. J, and a receiving node device provided with a receiving processing means for performing a predetermined control information receiving process according to the difference.

In the program used in the transmitting node device according to the present invention, M check patterns NM, N
.., M−1 (M is a natural number, N is a natural number equal to or greater than M + 1) by the test pattern generation method capable of generating the test pattern N. An inspection pattern generation process of generating an inspection pattern I with the control information I as an initial value.
And a test pattern I, and the computer performs an encoding process of encoding the control information I and converting it into a control information code set I, and a transmission process of transmitting the control information code set I. I have.

In the program used in the receiving node device according to the present invention, M check patterns NM, N
.., M−1 (M is a natural number, N is a natural number equal to or greater than M + 1) by the test pattern generation method capable of generating the test pattern N. A test process for generating a test pattern I with as an initial value, configuring the control information I with the control data I and the test pattern I, and receiving a control information code set I transmitted by encoding the control information I; A decoding separation process for decoding the received control information code set J (J = 1, 2, 3,...) Into control information J, and separating the control information J into control data J and a test pattern J; (P is an integer greater than or equal to 0), the inspection patterns JPM, JPM + 1,.
With initial values as reference values, reference patterns JP, JP + 1,.
Reference pattern generation processing for generating J and reference pattern J
−P, JP + 1,... J and inspection patterns JP, JP
+1... J, and a control information receiving process of performing a predetermined process according to the difference is executed by the computer.

[0036]

According to the present invention, a part of the control information is used as an inspection pattern. Each time the control information is transmitted, an inspection pattern is generated by the inspection pattern generation method. The inspection pattern generation method is a method capable of determining the next inspection pattern from the inspection patterns included in the M pieces of control information transmitted so far.

The receiving node authenticates the received control information using this rule. That is, the test pattern (= reference pattern) estimated from the test patterns added to the M pieces of control information (M is a natural number) received so far.
Is compared with the actually received inspection pattern. P +
Only when the result (difference between the reference pattern and the test pattern) obtained by one comparison (P is an integer of 0 or more) satisfies a predetermined condition, the received control information is controlled by the transmitting node. Authenticate as information.

Operation Regarding the First Problem When a pseudo control information code set is received due to a transmission line failure, the pseudo control information code set is determined by the probability that a pattern for identifying the control information code set appears in a random pattern. Receive the code set. As mentioned above, in the prior application,
It was not possible to distinguish whether the received control information code set was a pseudo control information code set or a control information code set from a transmitting node. For this reason, maintenance and operation monitoring is performed based on erroneous control information obtained by decoding the pseudo control information code set, which may cause a problem in the packet communication system.

According to the present invention, the receiving node generates a reference pattern having a test pattern value to be included in the next received control information code set, based on the test pattern included in the control information code set already received. Then, the received control information code set is authenticated by comparing the actually received test pattern with the reference pattern. The test pattern included in the pseudo control information code set that appears in the random pattern is also a random pattern.

Therefore, in the authentication of the control information code set (comparison of the received test pattern and reference pattern),
The probability of not being authenticated is 2L (L
Is larger in proportion to the bit length of the test pattern). For this reason, by applying the present invention and discarding the control information included in the unauthenticated control information code set, if a pseudo control information code set is received due to a transmission path failure, an erroneous The probability of performing maintenance and operation monitoring is reduced.

Further, when a control information code set that has not been authenticated continuously for a predetermined number of times (= P + 1 times) is received, it is determined that a failure in the transmission path has occurred, and a predetermined number of times (=
(P + 1 times) When the control information code set that has been successively authenticated is received, it is determined that the transmission path failure has been recovered, and all control information received during the transmission path failure detection period is discarded, thereby performing the inspection. Even if the bit length of the pattern is short (when the bit length of the test pattern is short, the probability of erroneous authentication increases, but the ratio of control data to control information increases, so the amount of information available for maintenance operation monitoring increases). In addition, the probability of erroneous maintenance and operation monitoring can be reduced to a level that does not cause a problem.

Operation Regarding the Second Problem If a code error occurs in a previous bit during transmission of a packet filled with a pattern that changes to a pseudo control information code set by only inverting a specific bit, a pseudo error occurs. A control information code set results. As described above, in the technique of the prior application, when a packet from a malicious user is transmitted as described above, whether the pseudo control information code set or the control information code set transmitted from the transmission node is determined at the receiving node. Since it is not possible to distinguish the packet communication, there is a possibility that a serious noise may occur in the packet communication system. In particular, even if the bit length of the pattern for authenticating the control information code set (such as a special code dedicated to the control information code set) is increased, a great effect is obtained in reducing the reception probability of the pseudo control information code set. I couldn't.

In the present invention, since the control information code set is authenticated by comparing the test pattern received by the receiving node with the generated reference pattern, one bit is inverted for false authentication of the pseudo control information code set. It is necessary that the packet be buried with a pattern that changes to the pseudo control information code set and that the test pattern included in the changed pseudo control information code set matches the reference pattern. Furthermore, since the reference pattern changes each time the packet is received, it is necessary to change the packet pattern in order to cause erroneous authentication to continue.

However, since it is impossible to predict and control the code error on the transmission line, it is impossible to predict and control the generation of the pseudo control information code set. The pattern of the packet cannot be changed. Accordingly, it is possible to reduce the possibility that a serious problem occurs in the packet communication system by applying the present invention.

The test pattern generated by the test pattern generation method has a periodicity. By increasing the period, the pattern corresponding to the test pattern among the packets generated by the malicious user can be transmitted. It is possible to reduce the probability that the test pattern generated by the node matches. For example, an n-order pseudo-random pattern is adopted as an inspection pattern generation method, and M is set to (n
/ Bit length of test pattern; rounded up below decimal point), the longer the n, the longer the cycle.

Other Actions In addition to the above-mentioned actions, it is necessary to divide the communication into a plurality of control information code sets for communication by using a value indicating the order of control information as a test pattern used in the present invention. It is possible to easily communicate certain control data having a large amount of information. That is, at the transmitting node, the value indicating the order of the divided control data is transmitted as the value of the test pattern, and at the receiving node, the received control data From the control data before the division.

[0047]

Embodiments of the present invention will be described below with reference to the drawings. First, a first embodiment of the present invention will be described. FIG. 1 shows the transmitting node 10 in FIG.
7 is a block diagram and a timing chart showing a configuration example and operation of the control information transmitting unit 16 according to the present embodiment at 0. FIG. 2 shows the test pattern transmitting unit 16 in FIG.
2 is a block diagram illustrating a configuration example of FIG.

FIG. 3 is a block diagram and a timing chart showing an example of the configuration of the control information receiving section 35 in the receiving node 300 of FIG. 30 according to the present embodiment and its operation.
FIG. 4 is a block diagram showing a configuration example of the test pattern receiving unit 352 in FIG. Other configurations of the transmitting node 100 and the receiving node 300 are the same as those shown in FIGS.

In FIG. 1A, the control information transmitting section 16
Are the control data transmitting unit 161 and the test pattern transmitting unit 16
2 The control data transmission unit 161 generates and outputs control data (control information) 1, 2, 3, 4,... Shown in (e) for maintenance operation monitoring of the packet communication system.
Further, when the control data is ready to be transmitted, it receives the detection signal shown in (b) from the idle code set detector 15 in FIG. 29 and outputs the replacement signal shown in (c).
Further, after the replacement signal is output, an update signal shown in (d) prompting the update of the test pattern is output in order to transmit the next control data. It should be noted that various signals may be input from outside the transmission unit for generating control data.

The test pattern transmission section 162 generates and outputs test patterns 1, 2, 3, 4,... Shown in (f). Further, in response to the update signal, the output is updated to a test pattern to be transmitted next. It should be noted that various signals may be input from outside the transmission unit for various settings.

The control information transmitting section 16 outputs control information including the control data and the test pattern, and the control information is replaced with a control information code set by the control information encoding section 17 shown in FIG.

In FIG. 2, the test pattern transmitting section 162
Is composed of a register 163 and an F (X) operation unit 164. The register 163 uses the update signal as a clock, the register value is initialized to “0000” by a reset signal, and the inspection pattern is output as a transmission value. This transmission value is input to the F (X) calculation unit 164 as X. The F (X) calculation unit 164 calculates F (X) when X = 15.
If X = 0 and X is other than 15, F (X) = X + 1 is output. This output is input to the register 163 as the next transmission value.

In FIG. 3A, the control information receiving unit 35
Are the control data receiving unit 351 and the test pattern receiving unit 35
2 The control data receiving unit 351 receives the control data of (d) and the received signal of (b) and performs various processes for maintenance and operation monitoring of the packet communication system. The control data to which the authentication signal shown in (e) from the inspection pattern receiving unit 352 is not input is not used for maintenance operation monitoring. Note that a configuration may be employed in which a signal is input from outside the receiving unit for various settings, or an alarm or reception control data is output outside the receiving unit for maintenance and operation monitoring.

The test pattern receiving unit 352 receives the received signal, compares the test pattern with an internally generated reference pattern, recognizes the received control information, and confirms the result as shown in FIG. Output as a signal. Note that a configuration may be employed in which a signal is input from outside the receiving unit for various settings, or an alarm or inspection pattern is output to the outside of the receiving unit for maintenance and operation monitoring.

In FIG. 4, the test pattern receiving section 352
Is composed of a register 353, an F (X) operation unit 354, a comparison unit 355, and an AND circuit 366. The register 353 uses the received signal as a clock, outputs a received value (test pattern) as an input, and outputs the immediately preceding received value. F
(X) The operation unit 354 determines that F (X) = 0 when X = 15,
When X is other than 15, F (X) = X + 1 is output as a reference pattern. This reference pattern is compared with the received value by the comparing unit 355 as the next transmitted value.
If they do not match, 0 is output. An authentication signal is obtained by inputting the comparison result and the received signal to the AND circuit 366.

FIG. 5 shows a flow of the test pattern transmitting section 162, and FIG. 6 shows a flow of the test pattern receiving section 352. In the present embodiment, the test pattern has a 4-bit length, and the transmitting node 100
An inspection pattern generation method of repeatedly generating numbers from 0 to 15 is employed. According to this method, it is possible to generate the value of the next test pattern from the value of the test pattern generated immediately before (M = 1).

In FIG. 5, after the first test pattern 0 is generated and output, the next test pattern X + 1 is generated and output after an update signal is input. By repeating this, when the inspection pattern becomes X = 15, F (X) = 0
To return to the first inspection pattern.

In FIG. 6, the test pattern receiving section 352
Sets the value of the received test pattern + 1 (however, 0 when the test pattern is the maximum value) as a reference pattern for the next received test pattern. When the reference pattern and the inspection pattern match, an authentication signal is output (= control information reception processing is performed: P = 0). That is, the authentication signal is output for the control information received this time only when the test pattern received immediately before and the test pattern received this time are consecutive numbers.

The test pattern is not limited to the 4-bit length,
The same flow can be applied to other bit lengths. For example, when the test pattern has an 8-bit length, the flow of FIGS. 5 and 6 can be applied by changing the test pattern to a number from 0 to 255.

Next, a second embodiment of the present invention will be described. In the present embodiment, the inspection pattern has a 4-bit length. FIG. 7 shows a flow of the test pattern transmission unit 162,
FIG. 8 shows a flow of the test pattern receiving unit 352. Other configurations are the same as those of the first embodiment.
This is shown in FIG. 30, FIG. 1, and FIG.

FIG. 9 shows the configuration of test pattern transmitting section 162 according to the present embodiment, and FIG. 10 shows the configuration of test pattern receiving section 352 according to the present embodiment. In FIG. 9, the test pattern transmission unit 162 includes registers 165, 1
66, an F (X1, X2) calculation unit 167. The registers 165 and 166 use the update signal as a clock, and the register 165 sets “1110” by a reset signal.
And the register 166 is initialized to “1111” by the reset signal. The register 165 outputs the next transmission value, and registers 166 and F (X1, X
2) Send to the calculation unit 167. The register 166 outputs a transmission value (inspection pattern).

The F (X1, X2) calculation unit 167 calculates
The next transmission value and the test pattern are input to X1 and X2, and a calculation is performed according to the following formula, and an output F (X1, X2)
2) is sent to the register 165 as the next transmission value. That is, + indicates an EXOR operation, the value of the fourth bit of F (X1, X2) = the value of the third bit of X1, the value of the second bit of X1, and the value of the third bit of F (X1, X2) = The value of the second bit of X1 + the value of the first bit of X1 The value of the second bit of F (X1, X2) = the value of the first bit of X1 + the value of the fourth bit of X2 The value of the fourth bit of F (X1, X2) The calculation of 1-bit value = 4th bit value of X2 + 3rd bit value of X2 is performed.

In FIG. 10, the test pattern receiving unit 35
2 includes registers 367 and 368, an F (X1, X2) operation unit 368, a comparison unit 369, and an AND circuit 370. The registers 367 and 368 use a reception signal input after the reception value is determined as a clock. The register 367 receives the received value (test pattern) and outputs the previous received value. The register 368 receives the previous received value and outputs the previous received value. F (X1, X
2) The operation unit 368 inputs the immediately preceding received value and the immediately preceding received value as X1 and X2, and outputs F (X1, X
2) A reference pattern is output by performing a calculation using the same calculation formula as that of the calculation unit 167. By inputting the reference pattern and the received value (inspection pattern) to the AND circuit 370, an authentication signal is obtained.

This embodiment makes the second problem more effective than the first embodiment by employing a long-period pattern as the inspection pattern generation method. Inspection pattern transmission unit 16 in transmission node 100
In No. 2, an inspection pattern generation method for generating a number of a seventh-order pseudo random pattern (generation polynomial = 1 + X6 + X7) as the inspection pattern is adopted. That is, in the present embodiment, M = 2, and it is possible to generate the value of the next inspection pattern from the values of the inspection patterns generated two and one before.

In the test pattern receiving section 352 of the receiving node 300, the test pattern received next by the same test pattern generation method as that of the transmitting node is obtained from the test pattern immediately before and the test pattern received immediately before. Generate a reference pattern for the pattern. If the reference pattern matches the inspection pattern, an authentication signal is output.

In the first embodiment, since M = 1, the original test pattern is returned every 16 transmissions / receptions. On the other hand, in the present embodiment, the period is 128, which is effective for the second problem. It should be noted that the case where a longer-period pattern is adopted as the inspection pattern generation method can also be realized by the same flow as in FIGS. 7 and 8 according to the present embodiment.

Next, a third embodiment of the present invention will be described. FIG. 11 shows the test pattern receiving unit 3 according to the present embodiment.
52 shows the flow of 52. Others are the same as the first embodiment and are shown in FIGS. 28 to 30, FIGS. 1 and 3.
FIG. 12 shows an inspection pattern transmission unit 162 according to the present embodiment.
FIG. 13 shows the configuration of the test pattern receiving unit 352 according to the present embodiment.

In this embodiment, two states, that is, a synchronization state and an out-of-synchronization state are determined, and it is determined that a transmission line failure has occurred during the out-of-synchronization state, and all received control information is discarded. Thus, the first problem is made more effective than the first embodiment.

In FIG. 12, the test pattern transmitting section 16
2 includes a register 168, an F (X) operation unit 169, a comparison unit 170, a counter 171, an S / R-FF circuit 172, an AND circuit group, and an OR circuit group. The register 168 uses the received signal input after the received value is determined as a clock, and receives the received value (inspection pattern) as one clock.
The previous received value is output, and the F (X) calculation unit 169 inputs the immediately preceding received value as X, and when X = 15,
If (X) = 0 and X is other than 15, the calculation of F (X) = X + 1 is performed and the reference pattern is output. The comparison unit 170
The reference pattern and the received value are compared, and 1 is output when they match, and 0 is output when they do not match.

The counter 171 has a count value of 0 by a reset signal and a count value of +1 by an increment signal. The counter 171 counts the number of consecutive authentications (out of synchronization) and the number of consecutive non-authentications (at the time of synchronization) from b1 and b0. By outputting the result and taking the AND, 1 is output when the number of times is 2. The S / R-FF circuit 172 outputs 1 in response to a set signal, outputs 0 in response to a reset signal, outputs 1 when in a synchronized state, and outputs 0 when out of synchronization. The received signal, the comparison result, the counter output, and the S / R-FF output A
An authentication signal is obtained by taking ND.

In FIG. 13, the test pattern receiving section 35
2 is a register 371, an F (X) operation unit 372, and D (X
(1, X2) operation unit 373, comparison unit 374, counter 37
5. It is composed of an S / R-FF circuit 376, an AND circuit group, and an OR circuit group. The register 371 uses the received signal input after the received value is determined as a clock, receives the received value (inspection pattern), outputs the previous received value, and outputs an F (X) calculation unit 169 using the 1 X of previous received value
And when X = 15, F (X) = 0 and X is 15
Otherwise, the calculation of F (X) = X + 1 is performed and the reference pattern is output.

The D (X1, X2) calculation unit 373 inputs the received value and the immediately preceding received value as X1, X2, and X1 <X
In the case of 2, D (X1, X2) = X1 + 16-X2, X1,
When X2 is other than the above, D (X) = X1-X2 is calculated, and b3, b2, b1, and b0 are output. This b3, b
By taking the AND of 2, b1 and b0, 1 is output when the received value immediately before the test pattern = 2 or 3. Comparison section 1
Reference numeral 70 compares the reference pattern with the received value, and outputs 1 when they match and 0 when they do not match.

The counter 375 has a count value of 0 by a reset signal and a count value of +1 by an increment signal. The counter 375 calculates the number of consecutive authentications (out of synchronization) and the number of consecutive non-authentications (at the time of synchronization) from b1 and b0. By outputting the result and taking the AND, 1 is output when the number of times is 2. The S / R-FF circuit 172 outputs 1 in response to a set signal, outputs 0 in response to a reset signal, outputs 1 when in a synchronized state, and outputs 0 when out of synchronization. Then, an authentication signal is obtained by ANDing the received signal, the comparison result, the D (X1, X2) output, the counter output, and the S / R-FF output.

In the present embodiment, as in the first embodiment, the inspection pattern has a 4-bit length and the transmission node 10
At 0, an inspection pattern generation method of repeatedly generating numbers from 0 to 15 as the inspection pattern is adopted.
That is, the value of the next test pattern can be generated from the value of the test pattern generated immediately before (M-1).

In the receiving node 300, the first
As in the embodiment of the present invention, the value of the received inspection pattern +
1 (however, 0 if the test pattern has the maximum value) is set as a reference pattern for the next received test pattern.
However, in the present embodiment, it is determined whether a synchronization state or an out-of-synchronization state. In the synchronization state, if the reference pattern and the inspection pattern match, an authentication signal is output. Do not authenticate information. That is, in the present embodiment, two types of control information reception processing, i.e., authentication determination at the time of synchronization and determination of synchronization / out-of-synchronization, are provided, and P = 0 is applied to the former and P = 2 is applied to the latter. Will be.

In FIG. 11, the initial state is an out-of-synchronization state. In the out-of-synchronization state, when the reference pattern and the inspection pattern match three consecutive times, the state transits to the synchronization state. In the synchronized state, when the reference pattern and the inspection pattern match three consecutive times, the state transits to the out-of-synchronization state. As described above, the synchronization state and the out-of-synchronization state are determined, and all the control information received during the out-of-synchronization state (a state in which a failure of the transmission path has been determined) is discarded, so that the test pattern Even if the bit length is short, the probability of erroneous maintenance monitoring can be reduced to a level that does not cause a problem, which is effective for the first problem.

The inspection pattern is not limited to the 4-bit length,
The same flow can be applied to other bit lengths. For example, when the inspection pattern has an 8-bit length, the inspection pattern is changed to a number from 0 to 255, so that FIG.
The flow of FIG. 7 can be applied. Although P = 2 in the determination of synchronization / out-of-synchronization, this value can be changed in accordance with the requirements of the system (a different value of P is used for each determination of synchronization and out-of-synchronization). Is also possible).

Next, a fourth embodiment of the present invention will be described. FIG. 14 shows the test pattern receiving unit 3 according to the present embodiment.
52 shows the flow of 52. Others are the same as those of the first and third embodiments, and are shown in FIGS. 28 to 30, FIGS. 1 and 3. In the present embodiment, as in the first and third embodiments, an inspection pattern generation method is employed in which the inspection pattern has a 4-bit length and the transmitting node repeatedly generates numbers from 0 to 15 as the inspection pattern. . That is, the value of the next test pattern can be generated from the value of the test pattern generated immediately before (M = 1).

In the receiving node 300, FIG.
As shown in FIG. 4, similarly to the first and third embodiments, the value of the received test pattern + 1 (however, 0 when the test pattern is the maximum value) is referred to the next received test pattern. Pattern. Also, as in the third embodiment, the synchronization state and the out-of-synchronization state are determined, and an authentication signal is output when the reference pattern and the inspection pattern match in the synchronization state. No authentication is performed on the reception control information.

In the present embodiment, the processing is performed in accordance with the difference between the reference pattern and the test pattern, instead of the judgment that the reference pattern and the test pattern match or not as in the first and third embodiments. Change. In the third embodiment, once the synchronization state is established, the synchronization is lost if the difference between the values of the next received test pattern is +1 even if the value greatly deviates from the previously received test pattern value. Did not change, and this abnormality could not be detected.

In this embodiment, when the difference from the previously received test pattern value is +4 or more, the reference pattern for the next received test pattern is not updated. As a result, even when the difference between the values of the test pattern received next is +1, authentication is not performed, and the abnormality can be detected.

Next, a fifth embodiment of the present invention will be described. This embodiment is obtained by applying the invention of claim 2 to the first embodiment. That is, means for detecting a code error of the control information code set received by the receiving node 300 is provided in the control information encoding unit 17 in FIG. 45 and the control information decoding unit 34 in FIG. The control information encoding unit 17 and the control information decoding unit 34 according to the first embodiment are used.

Hereinafter, three embodiments of the control information encoding unit 17 and the control information decoding unit 34 which can detect a code error of the control information code set will be described. Each embodiment is disclosed in Japanese Patent Application No. 2000-119885.

[Embodiment 1] FIG. 15 shows a control information encoding unit 1
7 and the operation of the control information decoding unit 34 is shown in FIG. Table 1 shows values of the 2-bit length parity control used in the control information encoding unit 34.

[0085]

[Table 1]

The operation of control information coding section 17 will be described with reference to FIG. (1) Input control information (15-bit length). (2) The control information is divided into three 5-bit blocks. (3) Even parity is determined for each 5-bit block, and the parity is added as a parity bit to form a 6-bit block. (4) The 2-bit parity control obtained from Table 1 is added to each 6-bit block to form an 8-bit block. (5) Perform 8B / 10B encoding on each 8-bit block, add a control information identification code, and output as a control information code set.

The operation of the control information decoder 34 will be described with reference to FIG. (1) Input a control information code set. (2) The control information code is deleted, and an even parity is obtained for each of the other three codes. (3) When at least one of the even parities 1 to 3 is 1, this control information code set is discarded, and when all the even parities 1 to 3 become 0, the processing after (4) is performed.

(4) 8B / 10B for each 10B code
Decoding is performed to make an 8-bit long block. (5) The 2-bit parity control is deleted from each 8-bit block to make a 6-bit block. (6) Calculate even parity for each 8-bit block. (7) When at least one of the even parities 1 'to 3' is 1, this control information code set is discarded, and when all the even parities 1 'to 3' become 0, (8) and subsequent steps Perform processing.

(8) Parity bits are deleted from each 6-bit block to make a 5-bit block. (9) Connect 5 bit blocks and output as control information (15 bit length).

[Embodiment 2] In this embodiment, the transmitting node encodes each communication data block divided into a plurality of 8-bit length blocks into a communication data code according to the 8B / 10B encoding method. And configured to transmit. In addition, the transmission node encodes 22-bit control information for transmission and processing of communication data into three control information code sets according to a control information encoding method during a period in which no communication data code is transmitted. And transmitted together with the identification code of the control information.

A method for encoding control information at the transmitting node according to this embodiment will be described below. FIG. 17 is a flowchart of a control information encoding method according to the present embodiment.
FIG. 8 is an explanatory diagram conceptually showing how blocks and control information codes are formed by the control information encoding method shown in FIG.

The encoding method of control information shown in FIGS. 17 and 18 comprises the following steps S1 to S5. (S1) The control information data 2 having a length of 22 bits is divided into two 8
It is divided into bit length blocks A1-1 and A1-2 and one 6-bit length block A2. (S2) The 8-bit long blocks A1-1 and A1-2 are converted into 8
Each of the control information codes 4 according to the B / 10B encoding method
-1 and 4-2. (S3) 20 in which the control information codes 4-1 and 4-2 are combined
The control information code parity A3 for the bit (“0” if the number of “1” in the bit string is even, “1” if the number is odd)
).

(S4): 2 bits are added to the 6-bit long block A2.
An 8-bit length block A1-3 is configured by giving a bit-length parity control. At this time, for the bits A to H of the 8-bit block A1-3, the bits of the 6-bit block A2 are assigned to A to F, and the parity control 6 is assigned to G and H. The value of each bit of the parity control is determined as shown in Table 2 below according to the value of each bit of the 6-bit long block A2 and the value of the control information code parity A3.

[0094]

[Table 2]

In the table, the "A" column indicates the value of each of the bits A to F of the 6-bit block A2.
The column is the value of the control information code parity A3 obtained in S3, and the column "C" is the control information code 4-1 to 4-3 according to the values of the corresponding columns "A" and "B". Indicates the value of each bit of the parity control which is determined so that the control information code parity for 30 bits obtained by combining the above is always “0”.

(S5): 8-bit long block A1-3
In accordance with the 8B / 10B encoding method.
3

Control information code sets 4-1 to 4-3 obtained by the above-described control information coding method at the transmitting node.
, The control information code parity for 30 bits obtained by combining them is always "0" (the number of "1" in the bit string is always even).

Next, a method for decoding control information data in this embodiment will be described. In the present embodiment, the receiving node is configured to decode the received communication data code according to the 8B / 10B encoding method to obtain communication data divided into a plurality of 8-bit length blocks. Also, the receiving node receives the identification code, which is the identification code of the control information or the code that can be estimated to be the identification code, during the period in which the communication data code is not transmitted, and receives the three control information code sets 4-1. ~ 4-3, and decodes them according to the control information decoding method.
The control information 2 'having a bit length is obtained.

A method for decoding the control information data at the receiving node will be described below. FIG. 19 is a flowchart of a control information decoding method according to the present embodiment, and FIG.
FIG. 10 is a schematic explanatory diagram for schematically showing how blocks and control information codes are formed by the control information decoding method shown in FIG. 9.

The decoding method of control information data shown in FIGS. 19 and 20 includes the following steps R1 to R4. (R1) A control information code parity A3 for 30 bits including the control information codes 4-1 to 4-3 is obtained. (R2) When the value of the control information code parity A3 is “0”, it is determined that no error has occurred during transmission, and each of the control information codes 4-1 to 4-3 is converted to an 8B / 10B code. Decoding according to the conversion method, and three 8-bit blocks A1-
1 to A1-3 are obtained. When the value of the control information code parity A3 'is "1", error processing defined in the following (E) is performed.

(R3) Of the bits A to H of the 8-bit block A1-3 ', A to F are converted to the 6-bit block A
Take out as 2 '. (R4) The 22-bit control information 2 'is composed of the 8-bit blocks A1-1' to A1-2 'and the 6-bit block A2'. (E) The control information error counter is incremented, and the received three control information codes 4-1 'to 4-3' are discarded.

According to the above-described control information decoding method at the receiving node, when a 1-bit error occurs during transmission of the control information using the 8B / 10B code, it can be reliably detected. Furthermore, since erroneous control information is discarded without being used for communication data and its transmission and processing, it greatly contributes to improvement in reliability of the communication system.

In the step (S3), the control information code parity A3 is obtained after the 8-bit blocks A1-1 and A1-2 are encoded into control information codes 4-1 and 4-2, respectively. , This is an 8-bit block A1
By preparing a table or a relational expression representing the correspondence between the values of −1 and A1-2 and the value of the control information code parity, the control information code parity A3 can be obtained before encoding.

[Embodiment 3] In this embodiment, the transmitting node encodes each communication data code divided into a plurality of 8-bit blocks into communication data codes according to the 8B / 10B encoding method. And configured to transmit. Also, the transmission node transmits the control information data having a length of 22 bits for transmitting and processing the communication data to the control data having a length of 16 bits and the parity of the control data having a length of 6 bits during a period in which the communication data code is not transmitted. , And is encoded into three control information codes according to a control information encoding method, and is transmitted together with the control information identification code.

A method of encoding control information at such a transmitting node will be described below. FIG. 21 is a flowchart of a control information encoding method according to the present embodiment, and FIG.
FIG. 3 is an explanatory diagram conceptually showing how blocks and control information codes are formed by the control information encoding method shown in FIG.

The control information encoding method shown in FIGS. 21 and 22 includes the following steps S1 to S6. (S1) The 16-bit control data 2-1 is divided into two 8-bit blocks A1-1 and A1-2. (S2) The 8-bit blocks A1-1 and A1-2 are 8B
The control information code 4-
Encode to 1,4-2. (S3) 20 in which the control information codes 4-1 and 4-2 are combined
Control information code parity for bits (“0” if the number of “1” in the bit string is even, “1” if the number is odd)
Ask for.

(S4) A control data parity 2-2 having a 6-bit length is obtained from the control data 2-1 according to the Hamming coding method (d = 4). (S5) A 2-bit parity control 6 is added to the control data parity 2-2 to generate an 8-bit block A1.
-3. At this time, the 8-bit block A1-
3 bits A to H, control data parity 2-2
Are assigned to AE and H, and the parity control is assigned to F and G. The value of each bit of the parity control is determined as shown in Table 3 below according to the value of each bit of the control data parity 2-2 and the value of the control information code parity obtained in step S3.

[0108]

[Table 3]

In the table, the "A" column shows the respective values of bits A to E and H of the 6-bit control data parity 2-2, and the "B" column shows the value obtained in S3. The value of the control information code parity, the “C” column is the corresponding “A” column.
According to the value of the “B” column, the value of each bit of the parity control determined such that the control information code parity for 30 bits including the control information codes 4-1 to 4-3 is always “0” Is shown.

(S6) The 8-bit block A1-3 is
The control information code 4-3 is encoded according to the 8B / 10B encoding method.

According to the control information encoding method at the transmitting node, the control information codes 4-1 to 4-3 are combined.
The control information code parity for the bit is always "0" (the number of "1" in the bit string is always an even number).

Next, a method for decoding control information according to this embodiment will be described. The receiving node decodes the received communication data code according to the 8B / 10B encoding method to obtain communication data divided into a plurality of 8-bit length blocks. In addition, the receiving node receives the three control information codes together with the reception of the identification code of the control information or the identification code that can be estimated to be the identification code during a period in which the communication data code is not transmitted. Is decoded in accordance with the control information data decoding method, thereby obtaining control information data having a length of 22 bits. Further, by performing control data error processing on the control data and control data parity constituting the control information, an error of the control data is obtained. It is configured to perform detection.

A method for decoding control information data at the receiving node according to the present embodiment will be described below. FIG. 23 is a flowchart of a control information decoding method according to the present embodiment, and FIG. 24 schematically shows how blocks and control information codes are formed by the control information decoding method shown in FIG. FIG.

The decoding method of control information data shown in FIGS. 23 and 24 includes the following steps R1 to R5. (R1) Control information code parity A3 'for 30 bits including the control information codes 4-1 to 4-3 (not shown)
Ask for. (R2) When the value of the control information code parity A3 ′ is “0”, it is determined that no error has occurred during transmission, and
Each of the control information codes 4-1 to 4-3 is decoded according to the 8B / 10B coding method, and the three 8-bit blocks A1 are decoded.
-1 'to A1-3' are obtained. Control information code parity A
When the value of 3 ′ is “1”, error processing in step (E) described below is performed.

(R3) A to E and H are extracted as the control data parity 2-2 from the bits A to H of the 8-bit long block A1-3 '. (R4) The control data 2-1 'having a 16-bit length is formed from the 8-bit blocks A1-1' to A1-2 '. (R5) Control data 2-1 ′ and control data parity 2-
From 2 ′, error detection is performed by control data error processing according to the Hamming coding method (d = 4). If an error is detected, error processing (E) is performed.

(E) The control information error counter A4 (not shown) is incremented, and the received three control information codes 4-1 'to 4-3' are discarded.

According to the control information decoding method at the receiving node, if a 1-bit error occurs during transmission of the control information using the 8B / 10B code, it can be detected without fail. Furthermore, even when there is a transmission section where the 8B / 10B code is decoded and transmitted, an error of 3 bits or less occurring in the section can be reliably detected. As described above, since error detection can be performed without depending on the 8B / 10B coding format, it greatly contributes to improvement in reliability even in a communication system having various forms.

In the above example, only error detection is performed. However, if the control data 2-1 has one bit error, error correction is also possible. In the present embodiment,
The present invention is not limited to the above-described method, and another encoding method capable of detecting or correcting an error may be used.

According to the present embodiment, in addition to the means for assuring the validity of the control information received by the receiving node, the means for detecting a code error of the control information code set is added, so that the reliability is improved. High maintenance and operation monitoring can be realized.

Next, a program according to an embodiment of the present invention will be described. The processing based on the above-described operation and the processing shown in each flowchart are performed by the CP of each computer system in the transmitting node 100 and the receiving node 300.
The program to be executed by U constitutes the program according to the present invention.

As a recording medium for recording this program, a magneto-optical disk, an optical disk, a semiconductor memory, a magnetic recording medium, or the like can be used.
M, RAM, CD-ROM, flexible disk, memory card and the like may be used.

The recording medium is a fixed medium such as a volatile memory such as an internal RAM of a computer system serving as a server or a client when the program is transmitted through a network such as the Internet or a communication line such as a telephone line. The one that holds the time program is also included.

The above program may be transmitted from a computer system storing the program in a storage device or the like to another computer system via a transmission medium or by a transmission wave in the transmission medium.
The transmission medium refers to a medium having a function of transmitting information, such as a network (communication network) such as the Internet or a communication line (communication line) such as a telephone line.

The program may be for realizing a part of the functions described above. Furthermore, what can realize the above-described function in combination with a program already recorded in the computer system, that is, a so-called difference file (difference program) may be used.

Therefore, this program may be used in a system or apparatus different from the system or apparatus of the transmitting node 100 and the receiving node 300 described in each embodiment, and the computer of the system or apparatus may execute this program. Therefore, functions and effects equivalent to the functions and effects described in the embodiments can be obtained, and the object of the present invention can be achieved.

[0126]

As described above, according to the present invention, the receiving node should be included in the next received control information code set based on the test pattern included in the already received control information code set. A reference pattern having a test pattern value is generated, and the received control information code set is authenticated by comparing the actually received test pattern with the reference pattern. Thereby, applying the present invention,
By discarding the control information included in the unauthenticated control information code set, the probability of performing erroneous maintenance and operation monitoring when a pseudo control information code set is received due to a transmission path failure is reduced. You.

When a control information code set that has not been authenticated continuously for a predetermined number of times (= P + 1 times) is received,
It is determined that a transmission line failure has occurred, and a predetermined number of times (= P +
(1) When a control information code set that has been successively authenticated is received, it is determined that the transmission path failure has been recovered, and all control information received during the transmission path failure detection period is discarded, thereby achieving control. Even when a short inspection pattern that does not restrict the information amount of data is adopted, the probability of performing erroneous maintenance monitoring can be reduced to a level that does not cause a problem.

Furthermore, since the reference pattern changes each time it is received, the probability of erroneous consecutive authentication is extremely low even if a malicious user sends any type of packet. No problem.

As described above, the present invention provides means for guaranteeing the validity of control data received by a receiving node when communicating control information for performing maintenance and operation monitoring in a communication system for communicating packets. Has an excellent effect.

[Brief description of the drawings]

FIG. 1 is a block diagram and a timing chart showing a configuration and operation of a control information transmitting unit in a transmitting node according to a first embodiment of the present invention.

FIG. 2 is a block diagram illustrating a configuration of a test pattern transmitting unit in the transmitting node according to the first embodiment of the present invention.

FIG. 3 is a block diagram and a timing chart showing a configuration and operation of a control information receiving unit in the receiving node according to the first embodiment of the present invention.

FIG. 4 is a block diagram illustrating a configuration of a test pattern receiving unit in the receiving node according to the first embodiment of the present invention.

FIG. 5 is a flowchart illustrating an operation of a test pattern transmitting unit in the transmitting node according to the first embodiment of the present invention.

FIG. 6 is a flowchart illustrating an operation of a test pattern receiving unit in the receiving node according to the first embodiment of the present invention.

FIG. 7 is a flowchart illustrating an operation of a test pattern transmitting unit in a transmitting node according to the second embodiment of the present invention.

FIG. 8 is a flowchart illustrating an operation of a test pattern receiving unit in a receiving node according to the second embodiment of the present invention.

FIG. 9 is a block diagram illustrating a configuration of a test pattern transmission unit in a transmission node according to a second embodiment of the present invention.

FIG. 10 is a block diagram illustrating a configuration of a test pattern receiving unit in a receiving node according to a second embodiment of the present invention.

FIG. 11 is a flowchart illustrating an operation of a test pattern receiving unit in a receiving node according to the third embodiment of the present invention.

FIG. 12 is a block diagram illustrating a configuration of a test pattern receiving unit in a receiving node according to a third embodiment of the present invention.

FIG. 13 is a block diagram illustrating a configuration of a test pattern receiving unit in a receiving node according to a fourth embodiment of the present invention.

FIG. 14 is a flowchart illustrating an operation of a test pattern receiving unit in a receiving node according to a fourth embodiment of the present invention.

FIG. 15 is a configuration diagram illustrating an operation of a control information encoding unit in a transmission node according to the first embodiment that can detect a code error in the fifth embodiment of the present invention.

FIG. 16 is a configuration diagram illustrating an operation of a control information decoding unit in the receiving node according to the first embodiment.

FIG. 17 is a flowchart of a control information encoding method according to the second embodiment.

18 is an explanatory diagram conceptually showing how blocks and control information codes are formed by the control information encoding method of FIG. 17;

FIG. 19 is a flowchart of a control information decoding method according to the second embodiment.

20 is a schematic explanatory diagram schematically showing how blocks and control information codes are formed by the control information decoding method of FIG. 19;

FIG. 21 is a flowchart of a control information encoding method according to the third embodiment.

22 is an explanatory diagram conceptually showing how blocks and control information codes are formed by the control information encoding method of FIG. 21.

FIG. 23 is a flowchart of a control information decoding method according to the third embodiment.

FIG. 24 is a schematic explanatory diagram schematically showing how blocks and control information codes are formed by the control information decoding method of FIG. 23;

FIG. 25 is a block diagram illustrating a configuration of an integrated network.

26 is a diagram showing SD in the synchronous communication system 7 in FIG.
FIG. 3 is a configuration diagram illustrating a signal configuration and a frame structure according to the H system.

FIG. 27 is a timing chart showing an example of signals for performing communication in the new communication system 7 ′.

FIG. 28 is a block diagram and a timing chart showing a configuration and operation of a packet communication system to which the present invention can be applied.

FIG. 29 is a block diagram and a timing chart showing the configuration and operation of the transmission unit in FIG. 20.

30 is a block diagram and a timing chart showing the configuration and operation of the receiving unit in FIG.

31 is a block diagram and a timing chart for explaining a first problem in the packet communication system in FIG. 20.

32 is a block diagram and a timing chart for explaining a second problem in the packet communication system of FIG.

[Explanation of symbols]

 REFERENCE SIGNS LIST 100 transmitting node 300 receiving node 16 control information transmitting section 161 control data transmitting section 162 test pattern transmitting section 35 control information receiving section 351 control data receiving section 352 test pattern receiving section

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5K028 MM09 MM12 MM14 PP12 RR04 5K030 HA08 HB06 HB12 JA10 5K035 DD01 GG02

Claims (13)

[Claims] 1. Encoding control information I (I = 1, 2, 3,...) Including control data for maintenance and operation monitoring and converting it into a control information code set I, , N−1,..., N−1 in the control data transmission method in the packet communication system in which
(M is a natural number, and N is a natural number equal to or greater than M + 1), the test pattern I is set as an initial value using the test patterns 1, 2,. Then, the control information I is composed of the control data I and the test pattern I, and the control information I is encoded to form a control information code set I
And transmitting the control information code set I. 2. Encoding control information I (I = 1, 2, 3,...) Including control data for maintenance operation monitoring and converting it into a control information code set I, , N−1,..., N−1 in the transmitting node device in the packet communication system in which
(M is a natural number, and N is a natural number equal to or greater than M + 1), the test pattern I is set as an initial value using the test patterns 1, 2,. A test pattern generating means for generating, and control information I composed of control data I and test pattern I, and encoding this control information I to control information code set I
A transmission node device, comprising: an encoding unit for converting the control information code set; 3. Encoding control information I (I = 1, 2, 3,...) Including control data for maintenance and operation monitoring and converting it into a control information code set I, In a method of receiving control data in a packet communication system in which communication is performed during a period during which communication is not performed, M transmission patterns NM and NM +
, N-1, where M is a natural number and N is a natural number equal to or greater than M + 1, the test pattern generation method that can generate the test pattern N
An inspection pattern I is generated with 2,..., M as initial values, and the control information I is composed of the control data I and the inspection pattern I,
The control information code set I which has been transmitted by encoding the control information I is received, and the received control information code set J (J = 1, 2, 3,.
Is decoded into control information J. The control information J is separated into control data J and a test pattern J. When J is P + M or more (P is an integer of 0 or more), the test pattern J− PM, J-
The reference patterns JP, JP + 1,..., J are generated using PM−1, M−1,..., JP−1 as initial values, and the reference patterns JP, JP−1,. , J−P + 1,... J, and a predetermined control information receiving process is performed according to the difference. 4. The control data receiving method according to claim 3, wherein a code error of the received control information code set J is detected. 5. Encoding control information I (I = 1, 2, 3,...) Including control data for maintenance operation monitoring and converting it into a control information code set I; In the receiving node device in the packet communication system in which the communication is performed during the period when the communication is not performed, on the transmitting side, M check patterns NM, NM +
, N-1, where M is a natural number and N is a natural number equal to or greater than M + 1, the test pattern generation method that can generate the test pattern N
An inspection pattern I is generated with 2,..., M as initial values, and the control information I is composed of the control data I and the inspection pattern I,
Receiving means for receiving the control information code set I which has been transmitted by encoding the control information I; and the received control information code set J (J = 1, 2, 3,...)
Is decoded into control information J, and decoding / separation means for separating the control information J into control data J and a test pattern J. When J is P + M or more (P is an integer of 0 or more), Inspection pattern JPM, J-
.., J using PM-M + 1,..., JP-1 as initial values; and reference patterns JP, JP-P + 1,. .. J, and a reception processing unit for performing predetermined control information reception processing in accordance with the difference. 6. The receiving node device according to claim 5, further comprising a detecting unit for detecting a code error of the received control information code set J. 7. Control information I (I = 1, 2, 3,...) Including control data for maintenance operation monitoring is encoded and converted into a control information code set I. In a communication method of control data in a packet communication system in which communication is performed during a period during which communication is not performed, M transmission patterns NM and NM +
, N-1, where M is a natural number and N is a natural number equal to or greater than M + 1, the test pattern generation method that can generate the test pattern N
2,..., M as initial values to generate a test pattern I, control information I is composed of control data I and test pattern I, and this control information I is encoded to control information code set I
And the control information code set I is transmitted. On the receiving side, the received control information code set J (J = 1,
2, 3,...) Are decoded into control information J. The control information J is separated into control data J and a test pattern J. When J is P + M or more (P is an integer of 0 or more), a test pattern generation method The inspection patterns JPM and J-
The reference patterns JP, JP + 1,..., J are generated using PM−1, M−1,..., JP−1 as initial values, and the reference patterns JP, JP−1,. , J−P + 1,... J, and a predetermined control information receiving process is performed according to the difference. 8. The control data communication method according to claim 7, wherein a code error of the received control information code set J is detected. 9. Encoding control information I (I = 1, 2, 3,...) Including control data for maintenance operation monitoring and converting it into a control information code set I, , N−1,..., N−1 in the communication system of control data in the packet communication system in which
(M is a natural number, and N is a natural number equal to or greater than M + 1), the test pattern I is set as an initial value using the test patterns 1, 2,. A check pattern generating means for generating, control information I comprising control data I and a test pattern I, coding means for coding the control information I and converting it into a control information code set I; A transmitting node device provided with transmitting means for transmitting the control information J, receiving means for receiving the control information J (J = 1, 2, 3,...), And decoding the received control information code set J into the control information J; A decoding / separation unit for separating the control information J into control data J and a test pattern J; JP −M + 1,..., JP−1 as initial values and reference patterns JP, JP−P + 1,.
Reference pattern generation means for generating a reference pattern J-
P, JP-P + 1,... J and inspection patterns JP, JP-P +
And a receiving node device provided with a receiving processing means for performing a predetermined control information receiving process according to the difference. 10. The control data communication system according to claim 9, wherein a detecting means for detecting a code error of the received control information code set J is provided in the receiving node device. 11. M inspection patterns NM, NM +
, N-1, where M is a natural number and N is a natural number equal to or greater than M + 1, the test pattern generation method that can generate the test pattern N
A test pattern generation process for generating a test pattern I using 2,..., M as initial values; and the control information I is composed of control data I and a test pattern I. A program for causing a computer to execute an encoding process of converting the control information code set I into an I code and a transmission process of transmitting the control information code set I. 12. M inspection patterns NM, NM +
, N-1, where M is a natural number and N is a natural number equal to or greater than M + 1, the test pattern generation method that can generate the test pattern N
A test pattern I is generated with 2,..., M as initial values, the control information I is composed of control data I and a test pattern I, and the control information code set I transmitted by encoding this control information I is Receive processing to be received and received control information code set J (J = 1, 2, 3,...)
Is decoded into control information J and the control information J is separated into control data J and a test pattern J. When J is P + M or more (P is an integer of 0 or more), a test pattern generation method Inspection pattern JPM, J-
, J-P + 1,..., J as reference values, and a reference pattern generation process for generating reference patterns JP, JP + 1,. A program for obtaining a difference from the inspection patterns JP, JP + 1,... J and performing a receiving process of performing a predetermined control information receiving process according to the difference. 13. The program according to claim 12, further comprising a detection process for detecting a code error of the received control information code set J.