JPH10262060A - Atm communication system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent time required for the connection establishment of end- to-end from increasing by the load state of a reception side host device, as well other than a physical distance between transmission and reception ATM communication equipment in the data transfer of the ATM communication equipment using an HIPPI interface. SOLUTION: In the case of performing communication from the host device 4 through communication equipment 5 and 3 to a host device 2, a connection request is generated from a host device 4 to a communication equipment 5, and a connection request packet 401 is transmitted from the communication equipment 5 to the equipment 3. It is received in the equipment 3, the connection request is sent out to the host device 2 and simultaneously, connection completion signals are sent out to the communication equipment 5. Thus, the connection establishment time is made shorter.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an ATM (Asynchrono).
us Transfer Mode) For communication systems, especially HIP
The present invention relates to an ATM communication system employing a PI (High Performance Parallel Interface) type interface signal.

[0002]

2. Description of the Related Art The interface of the HIPPI system is an electric signal interface for performing high-speed data transfer at a transmission speed of 800 Mbps (megabit / second) or 1.6 Gbps (gigabit / second), and is mainly used for supercomputers and high-performance computers. Used in stations, etc.

ATM (Asynchronous Transfer Mode) is a protocol for efficiently transmitting such high-speed data to a distant place.
ANSI (American National Standards)
Institute: American National Standards Institute).

[0004] FIG. 14 shows a schematic configuration of an ATM communication system using such an HIPPI-type interface, and higher-level devices 2 and 4 communicate with each other via ATM communication devices 3 and 5 connected to the ATM network 1. And
The higher-level devices 2 and 4 and the ATM communication devices 3 and 5 communicate with the H
They are interconnected by an IPPI interface. FIG. 15 shows a HIPPI interface signal, and shows a connection relationship between a higher-level device and an ATM communication device each having one HIPPI interface for transmission and reception.

FIG. 16 shows the data transfer of the conventional ATM communication device using the HIPPI interface in a sequential manner. In the data transfer by the credit control according to the recommendation of ANSI, the upper-level device 4 on the transmission side uses the credit transfer. When a transmission request (Req. = 1) occurs, it is transmitted to the communication device 5. The communication device 5 sends a connection request packet (I-communication packet) to the communication device 3 on the receiving side via the ATM line 1.
Field) 401 is transmitted.

Here, "credit control" is one of techniques for controlling transmission from the receiving side so that data overflow does not occur on the receiving side. Specifically, this is implemented by notifying the transmitting side of the credit value as a value representing the number of packets that can be currently received on the receiving side to the transmitting side. However, the packet in this case represents unit data that is a unit of transmission and reception, and therefore does not necessarily match a packet on the protocol.

The communication device 3 receiving the connection request packet 401 sends a connection request signal (Re
q. = 1), and a connection completion signal (Con. = 1) is sent from the host device 2.
Only after receiving the data, the packet 201 including the initial credit Ci is transmitted to the transmitting side communication device 5.
Reply to. Here, the initial credit Ci is a credit value notified from the receiving side to the transmitting side at the beginning of the communication, and the initial credit generally corresponds to the maximum number of continuous bursts that can be received by the receiving side. A value representing the number of buffers is used. Here, the burst has a fixed length, and generally one HIPPI packet having a variable length is constituted by a plurality of bursts.

In the case of HIPPI, credit control is HIP
Applied on a PI burst basis. HIP over protocol
A PI packet is composed of a plurality of HIPPI bursts, and a destination is generally set for each of a plurality of HIPPI packets. Accordingly, since the target of the credit control in the case of HIPPI is the HIPPI burst, each of the lines 402 with arrows is also represented in FIG. 16 so as to correspond to each HIPPI burst. I have.

As described above, in the conventional ATM communication apparatus, FIG.
Since it is assumed that the correspondence between the connection and the frame configuration as shown in FIG. 8A is assumed, frequent disconnection of the connection is not considered.

[0010] In addition, when the receiving side is busy, "Camp o"
In the conventional "n" control, as shown in FIG. 17, the conventional ATM communication apparatus waits for a certain period of time from transmission of the connection request packet 401 to reception of the packet 201 including the initial credit Ci. Then, the connection request packet 401 is retransmitted many times until a timeout occurs for a predetermined number of times.

[0011]

As described above, the conventional HI
In data transfer of an ATM communication device using a PPI interface, a call originated from a calling ATM communication device and reached to a called ATM communication device via an ATM network in order to establish an end-to-end connection. The connection request signal from the higher-level device on the receiving side is transmitted from the ATM communication device on the receiving side to the higher-level device on the receiving side, and only when a connection completion signal from the higher-level device on the receiving side is received.
The TM communication device can receive. Therefore, the receiving side ATM
Data cannot be transmitted from the transmission side until the connection completion signal returned from the communication apparatus to the transmission side ATM communication apparatus via the ATM network returns from the transmission side ATM communication apparatus to the transmission side host apparatus.

Therefore, the time required to establish an end-to-end connection depends on the physical distance between the transmitting and receiving ATM communication devices including the case where the connection is made via the ATM network, and the receiving-side higher-level device being connected to the receiving-side ATM device. After receiving the connection request signal from the communication device, the connection completion signal is transmitted to the receiving side ATM.
It also increases depending on the time until a response is returned to the communication device, that is, the load state of the receiving higher-level device.

The upper protocol of the HIPPI interface is TCP / IP (Transmission Control Protocol).
ol / Internet Protocol) or a connectionless protocol such as the one-to-two communication between the ATM communication device 3, the ATM communication device 5, and the ATM communication device 7 as shown in FIG. 18B, the transmission destination from the upper protocol of the HIPPI interface changes frequently, so that connection and disconnection of the connection by the HIPPI interface frequently occur as shown in FIG. As a result, the ratio of the connection connection or disconnection time to the entire communication increases. Therefore, the overall communication efficiency is reduced, and AT
It is difficult to make full use of the high speed of M communication.

Further, in the simultaneous communication with a plurality of communication partners as shown in FIG.
Since connection and disconnection of two connections from the M communication device 5 and the ATM communication device 7 are performed, communication with only one of them is possible at the same time. One of them is "Ca
You will have to wait in the "mp On" state.

In this case, a connection connection request packet due to a timeout as shown in FIG. 17 is retransmitted many times from the ATM communication device waiting in the "Camp On" state. There is a problem that extra traffic inflow is increased, and an ATM communication device during communication is adversely affected by an increase in transmission delay.

The present invention eliminates the effect of the time required to establish an end-to-end connection due to the load state of a receiving higher-level device in data transfer of an ATM communication device using a conventional HIPPI interface, and , Reduce connection time as much as possible,
By preventing excess traffic inflow in the "On" state, the overall communication efficiency is prevented from deteriorating,
It is an object of the present invention to provide a high-speed ATM communication system that does not adversely affect simultaneous communication with a plurality of communication partners.

[0017]

According to the present invention, an ATM is provided.
ATM in which host devices perform connection-type two-way communication with each other via an ATM communication device interconnected to a communication network
A communication system, wherein the receiving-side ATM communication device responds to an incoming connection connection request from the calling-side higher-level device transmitted from the calling-side ATM communication device and the receiving-side higher-level device is not in a call; An ATM communication system having means for transmitting a connection connection request signal to a receiving side higher-level device and transmitting a connection connection completion signal to the transmitting side ATM communication device is obtained.

Further, the receiving side higher-level device has means for transmitting a connection connection completion signal to the receiving side ATM communication device in response to a connection connection request signal from the receiving side ATM communication device. ,
In addition, the receiving-side ATM communication device transmits the incoming call between the time when the connection connection completion signal is transmitted and the time when the data from the transmitting-side higher-level device transmitted from the transmitting-side ATM communication device is completely received. If there is no connection completion signal from the upper side device, the originating AT
It has a means for sending a connection disconnection request to the M communication device.

Further, the receiving-side ATM communication device responds to an incoming connection connection request from a transmitting-side higher-level device transmitted from the transmitting-side ATM communication device,
A storage unit for temporarily storing the connection connection request when the receiving-side higher-level device is in a call; the transmitting-side ATM communication device performs the receiving-side ATM communication without retransmitting the connection connection request; And a means for waiting for reception of a connection completion signal from the communication device, wherein the receiving-side ATM communication device reads a connection request from the storage means in response to a call termination of the receiving-side higher-level device. Means for transmitting a connection connection request signal to the receiving side higher-level device, and transmitting a connection connection completion signal to the transmitting side ATM communication device.

The operation of the present invention will be described. The connection connection request from the transmission side higher-level device transmitted from the transmission side ATM communication device is transmitted to the reception side A connected via the ATM network.
If the receiving higher-level device is not in a call when a call arrives at the TM communication device, a connection connection request signal is transmitted from the receiving-side ATM communication device to the receiving-side higher-level device, and at the same time, the receiving-side ATM communication device transmits from the receiving-side ATM communication device. An end-to-end connection is established by sending a connection completion signal to the ATM communication device.

Thus, the receiving-side ATM communication device transmits the connection completion signal to the transmitting-side ATM communication device without waiting for the connection-connection completion signal from the receiving-side higher-level device. There is no time to wait between sending a connection connection request signal to the receiving-side higher-level device and receiving a connection connection completion signal from the receiving-side higher-level device.
Since the connection connection completion signal to the communication device can be sent quickly, the time required for establishing an end-to-end connection is also reduced.

Further, when the receiving-side higher-level device is not in a call, after transmitting a connection completion signal from the receiving-side ATM communication device to the transmitting-side ATM communication device, the transmitting-side ATM communication device transmits from the transmitting-side ATM communication device. If there is no connection completion signal from the receiving-side higher-level device until the data from the higher-level device is completely received by the receiving-side ATM communication device, the transmitting-side ATM communication device receives the data from the receiving-side ATM communication device.
A request to disconnect the connection is made from the TM communication device. In order to eliminate the waiting time from sending the connection connection request signal from the receiving side ATM communication device to the receiving side higher order device until receiving the connection connection completion signal from the receiving side higher order device, the state of the receiving side higher order device is changed. Cancel the connection completion signal sent without confirmation and disconnect the connection for another connection request.

When a connection connection request from the originating host device transmitted from the originating ATM communication device arrives at the terminating ATM communication device connected via the ATM network, the terminating host device during the call is connected. In the case, the called AT
If the connection connection request is temporarily stored in the M communication device and the originating ATM communication device cannot receive the connection connection completion signal from the called ATM communication device,
The end-to-end connection is established after receiving the connection completion signal without retransmitting the connection connection request.

[0024] Thus, since the transmitting side ATM communication device only needs to send the connection connection request once, there is no need to retransmit from the transmitting side, and it is possible to prevent an increase in unnecessary traffic between the ATM communication devices.

Further, when the receiving-side higher-level device is in a call, a connection connection request from the transmitting-side higher-level device transmitted from the transmitting-side ATM communication device is transmitted to the receiving-side ATM communication device connected via the ATM network. When an incoming call is received, the connection connection request temporarily stored in the receiving-side ATM communication device is read from the temporary storage at the time of termination of the call of the receiving-side higher-level device. At the same time as sending the connection request signal,
An end-to-end connection is established by sending a connection connection completion signal from the called-side ATM communication device to the calling-side ATM communication device.

Therefore, at the end of the call of the higher-level device on the receiving side,
Not only can a wasteful waiting time be eliminated by immediately accepting the next connection connection request temporarily stored in the called side ATM communication device and kept waiting, but also the calling side A
By sending a connection completion signal to the TM communication device, it informs the end-to-end connection establishment and urges data transfer from the originating host device, without being aware of Camp On control on the originating protocol. It becomes possible to communicate.

[0027]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram showing functions of an ATM communication apparatus according to one embodiment of the present invention. In FIG. 1, 3
An ATM cell input line 02 is input to the ATM line receiving interface unit 90. The ATM line receiving interface unit 90 terminates the ATM cell input line 302 to perform cell synchronization, and outputs all valid cells other than empty cells to the cell disassembly unit 80 via a FIFO (First In First Out) 81.

In the cell decomposing unit 80, the VPI (Virtual) of the cell header of all the cells input through the FIFO 81
Path Identifier), VCI (Virtual Channel Identif)
ier) and PTI (Payload Type Identifier) fields, and a cell in which each field is valid is selected as a control cell and a communication cell.
The data is output to the control cell processing unit 100 via the IFO 101.

In the case of a communication cell, the received cell is determined by the cell header information during the call notified from the H-PDU (HIPPI Protocol Data Unit) reception processing unit 70 via the signal line 72. Determine whether the cell is a cell. As a result of the determination, if the cell is a busy cell, only the payload portion of the cell is stored, and the PTI field of the cell header is set to A.
AL5 (ATM Adaption Layer 5) CPCS (Common Part
Convergence Sublayer)-When a cell indicating the end of the PDU is detected, the AAL5 trailer is checked by connecting all the stored payloads, and if there is no abnormality, the AAL5 trailer and padding data are obtained. Except for restoring to the original data packet H-PDU,
The data is output to the H-PDU reception processing unit 70 via the FIFO 71.

The V of the cell header recognized by the cell decomposing unit 80
PI, VCI and PTI fields and AAL5 C
The information of the PCS-PDU length is set in advance by the control processor 110 before the start of communication.

The H-PDU reception processing unit 70
1 to process the restored H-PDU input through the H.PDU. The processing differs depending on the contents of the HB-Header (HIPPI Burst header) of the H-PDU, and if the transmission control information is received, the H-PDU transmission processing unit 30 via the signal line 73
Notify reception. In the case of reception control information or reception data, H-PDU is converted to HIPPI-Burst and then
The data is output to the FIFO 61, and when the data includes “I-Field”, the data is output to the Camp on FIFO 10.

The H-PDU reception processing unit 70 also immediately sets the Camp-on FIFO 10
Is checked, and if an H-PDU including “I-Field” is stored, the corresponding H-PDU is stored in Camp O.
One is read out from the n-FIFO 10 to check the content. If the content is normal, the connection request for the connection is output to the FIFO 61, and at the same time, the H-PDU transmission processing unit 30 is instructed to transmit the initial credit via the signal line 73.

The HIPPI receiving interface unit 60
It processes information input via the IFO 61. FI
If the information input via the FO 61 is a connection connection request, the HIPPI reception interface 321
HIPP is turned on ("1") and the HIPP
It waits for the Connect signal of the I reception interface 322 to turn on ("1").

When the information input via the FIFO 61 is the reception data HIPPI-Burst,
If it can be output, it is output on the data bus of the HIPPI reception interface 321. Whether the output of the reception data is possible depends on Re of the HIPPI reception interface 322.
It is determined based on whether or not an ady signal is received.
Wait until the Ready signal of No. 2 is received.

The H-PDU reception processing unit 70
HIPPI-Bu output on the data bus of the HIPPI reception interface 321 by the reception interface unit 60
The number of rst is monitored via the signal line 62, and the output HIP
Each time the number of PI-Bursts reaches a preset value of a new credit value Cn, H-
It instructs the PDU transmission processing unit 30 to transmit the new credit Cn.

Reference numeral 311 denotes a HIPPI transmission interface, and a data bus for transmission together with a control line is terminated by the HIPPI transmission interface unit 20. The HIPPI transmission interface 311, the HIPPI reception interface 321 and the HIPPI transmission interface 31
In the case of No. 2, the same signals as those of the HIPPI reception interface 322 correspond to the upside down relationship in transmission and reception.

The signal input to the HIPPI transmission interface unit 20 is classified according to the meaning and type of the signal.
If the quest signal changes to the ON state ("1"), FI
It outputs a connection request to the FO 21. HIP
The PI transmission interface unit 20 also outputs a ready signal on the transmission side to the HIPPI transmission interface 312. Therefore, if the signal input to the HIPPI transmission interface unit 20 is HIPPI-Burst, the PI
Output to the IFO 21. If the request signal changes to the off state (“0”), a request to disconnect the connection is output to the FIFO 21.

The H-PDU transmission processing unit 30
, And if the signal is a connection request signal or a connection disconnection request signal, the transmission control H
-Generate a PDU and output it to the cell assembling unit 40 via the FIFO 31; if it is HIPPI-Burst, convert it from HIPPI-Burst to an H-PDU and output it to the cell assembling unit 40 via the FIFO 31 .

The H-PDU transmission processing unit 30 also monitors the signal line 73 and, when there is an instruction to transmit reception control information or credit information, generates an H-PDU for reception control and sends it through the FIFO 31. And outputs it to the cell assembling section 40.

In the cell assembling section 40, the H-PDU input from the H-PDU transmission processing section 30 through the FIFO 31
To generate AAL5 CPCS-PDU by adding padding data and AAL5 trailer to
The data is divided into cells and output to the ATM line transmission interface unit 50 via the FIFO 41. In addition, the cell assembling unit 40 also multiplexes control cells input from the control cell processing unit 100 via the FIFO 102 and outputs the multiplexed control cells to the ATM line transmission interface unit 50 via the FIFO 41.

The ATM line transmission interface unit 50
A transmission-side termination circuit of the TM line 301,
Output to the ATM line 301.

Next, the operation of the embodiment of the present invention will be described with reference to the drawings. FIG. 2 shows H in the embodiment of the present invention.
FIG. 2 shows a state of data transfer of an ATM communication device using an IPPI interface. In the case of the embodiment of the present invention shown in FIG. 2, when a transmission request is generated by the upper-level device 4 on the transmission side, the request is transmitted to the communication device 5 on the transmission side as a Req. = 1 signal. , The connection request packet 401 is transmitted to the communication device 3 on the receiving side.

The communication device 3 that has received the connection request packet 401 sends a connection request signal Req. = 1 to the host device 2 on the receiving side unless the communication device 3 itself is in a call. At the same time, the communication device 3 also sends a connection completion signal 201 to the ATM communication device 5 on the transmitting side.

Upon receiving the connection completion signal 201, the communication device 5 on the transmitting side that has transmitted the connection request packet 401 sends a connection completion signal Co to the host device 4 on the transmitting side.
While notifying n. = 1 and omitting the description in FIG. 2, since the Ready signal, which is the transmission permission signal notified with the initial credit Ci, is transmitted, the host device 4 transmits the HIPPI, which is the data transmission unit. Start transmitting a burst.

The communication device 3 on the receiving side which has transmitted the connection completion signal 201 transmits the HIPPI burst transmitted from the communication device 5 on the transmitting side from the higher-level device on the transmitting side to the AT.
Receiving and storing the data converted into M cells, the original HIPP
An I burst restoration operation is performed.

The communication device 3 receives the first received HIPPI
If the connection completion signal Con = 1 is received from the higher-level device 2 on the receiving side until the burst restoration is completed, the HIP
The receiving operation of the PI burst is continued as it is. If the connection completion signal Con = 1 is not notified from the upper device 2 on the receiving side by the time when the restoration of the first received HIPPI burst is completed, the communication on the transmitting side is performed. A connection disconnection request signal is sent to the device 5.

When the communication device 3 that has received the connection request packet 401 is talking with another device, as shown in FIG.
H- containing the connection information carried in the connection request packet 401
The PDU is stored in the Camp On FIFO in the communication device 3 on the receiving side, and when another call with the communication device 3 ends,
It is read from the Camp On FIFO by the communication device 3 on the receiving side itself. Therefore, the same operation as when the connection request packet 401 is received is restarted from the communication device 5 on the transmitting side without doing anything.

FIG. 4 shows how the data format is converted on the transmitting side of the ATM communication apparatus described above.
FIG. 5 shows how the data format is converted on the receiving side of the TM communication device.

FIG. 6 shows the relationship between the HIPPI burst and the H-PDU and the detailed description of the HB header in the H-PDU. FIG. 7 shows a detailed configuration of the HB header and the I-Field, and shows the H-PDU and the CPCS of the AAL5.
FIG. 8 shows the correspondence between PDUs and ATM cells.

The most characteristic feature of the embodiment of the present invention, H
FIGS. 9 and 12 show flowcharts of the operations of the PDU reception processing unit 70 and the H-PDU transmission processing unit 30 and the flow of the H-PDU processing, respectively. In FIG.
The operation flow of the status check (S1) of the HIPPI reception interface unit 60 is shown in FIG.
FIG. 11 shows a flowchart of the state check (S2) of the FO 10. In FIG. 12, the operation flow of the state check (S41) of the H-PDU reception processing unit 70 is shown in FIG.

FIG. 9 is a flowchart of the H-PDU processing in the H-PDU reception processing unit 70,
First, a status check of the HIPPI reception interface unit 60 is performed (S1), and this status check is processed according to the flowchart of FIG.

Therefore, referring to FIG. 10, the connection state is checked (S21), and if it is not during a call, it is checked whether it is in the connection waiting state (S2).
2). If the connection is waiting, the state of the Connect signal is checked (S23).
The connection state of the H-PDU reception processing unit 70 is set to "busy" (S24), and the process ends. In S23, if “0”, that is, if the connection is not completed, the process ends.

In S22, if the connection is not waiting, a check is made to see if the connection is in a disconnection waiting state (S25), and if so, the state of the Connect signal is checked (S2).
6). If this signal is "0", that is, if the connection is not completed, the connection state of the H-PDU reception processing unit 70 is set to "empty" (S27), and the process ends.

In S25, the process is terminated unless waiting for disconnection, and when the connection is completed "1" in S26, the process is terminated again.

If a call is being made in S21, it is checked whether a predetermined time, for example, one second, has elapsed from the previous state check (S28). If one second has not elapsed, the number of received bursts is checked (S29). If this received burst number is equal to the new credit number Cn, HP
The Cn is instructed to be transmitted to the DU transmission processing unit 30 (S3).
0). If one second has elapsed in S28, the process also proceeds to S30.

After the Cn transmission instruction or when the number of bursts ≠ Cn in S29, the state of the Connect signal is checked (S31). If this signal is "1", the process is terminated. If it is "0", Request = "0" is written into the HIPPI reception FIFO 61 (S32). And
It instructs the H-PDU transmission processing unit 30 to transmit Bbit = "1" (S33), sets the connection state of the H-PDU reception processing unit 70 to "empty" (S34), and ends the processing.

Returning to FIG. 9, the process proceeds to the next step S2. This step S2 is a state check of the CampOn FIFO 10, and a detailed flowchart thereof is shown in FIG. Referring to FIG. 11, a connection status check is performed (S35). If the status is not "empty", the process is terminated. If the status is "vacant", the status of the Camp On FIFO 10 is checked (S36). .

If the HB header is not "empty" but stored, the HB header is read out (S37).
-The PDU transmission processing unit 30 is instructed to transmit the initial credit number Ci (S38). And HIPPI reception F
Request = "1" is written in the IFO 61 (S39), the connection state of the H-PDU reception processing unit 70 is set to "waiting for connection" (S40), and the process ends.

Referring again to FIG. 9, H-PDU reception F
The reception state of the FIFO 71 is checked (S3), and the reception H
-If there is a PDU, it is read (S4). Then, the Vbit is checked (S5), and if "1", the Ibit is checked (S6). Ibit
If "1", the HB header is written in the Camp On FIFO 10 (S81), and the process returns to S1.

If Ibit = "0" in S6,
The Bbit is checked (S7), and if "1", Bbit = "1" is set in the H-PDU transmission processing unit 30 and a reception notification is made (S8). Then, or S7
When Bbit = "0" in the above, the Cbit is checked (S9), and when it is "1", the H-PDU transmission processing unit 30 is notified of the receipt of the credit information (S10).

Then, the Connect signal is checked (S11). If "0", the status of the HIPPI receiving interface unit 60 is checked (S12). This check follows the flow shown in FIG. 10 (S1), and the same applies to the case of "1" in S11.

Next, an address match check is performed (S13). If the address does not match, the process returns to the first step S1, and if the address matches, the Ebit is checked (S14). If “1”, receive H-PDU
Is regarded as having an error forcibly generated (S1).
5).

Thereafter, or when Ebit = "0",
H-PDU is converted to HIPPI-Burst (S1
6) This HIPPI-Burst is the HIPPI reception F
It is written into the IFO 61 (S17). And Dbit
Is checked (S18). If "0", the process returns to the first step S1, and if "1", the HIPPI reception FIF
Request = “0” is written in O61 (S
19), the connection state of the H-PDU reception processing unit 70 is set to "disconnect waiting" (S20). Then, the process returns to S1.

FIG. 12 is a flowchart showing the operation of the H-PDU processing in the H-PDU transmission processing unit 30. First, the state of the H-PDU reception processing unit 70 is checked (S41). The flow of this check is shown in FIG.

In FIG. 13, the presence or absence of a transmission instruction is checked (S57). If there is, a B bit is checked (S58). If "1", this B bit = "1" in the HB header of the transmission H-PDU. Is set (S5
9). Thereafter, or when Bbit = "0", a new credit is checked (S60).

If there is a new credit value, the transmission H-PDU
Cbit and Nbit are respectively set to “1” in the HB header (S61), and Cred of the HB header of the transmission H-PDU is set.
A new credit value is set in it-Information (S6
2).

Thereafter, or when there is no new credit value, the initial credit value is checked (S 63). If there is the initial credit value, C is added to the HB header of the transmission H-PDU.
The bit is set to "1" and the N bit is set to "0" (S64). Then, Cr of the HB header of the transmission H-PDU
Initial credit value is set in edit-Information (S
65).

Then, the H-PDU is transmitted by the H-PDU transmission FI.
It is written into the FO 31 (S66), and a reception notification check is made (S67). It should be noted that even if there is no transmission instruction in S57, the process proceeds to step S67. If there is no reception notification, the process ends. If there is no notification, the address is checked (S68).

If the address does not match the own address, the process ends. If the address matches, the B bit is checked (S69). If “1”, the H-PDU transmission processing unit 3
0 is set to "free" (S7).
0), Conn is sent to the HIPPI transmission interface unit 20.
ect = "0" is instructed (S71).

Thereafter, or if "0" in S69,
An initial credit is checked (S72), and if there is an initial credit value, a connection state check is performed (S73). If not, the connection is terminated. If the connection is waiting, the connection state of the H-PDU transmission processing unit 30 is set to "talking" (S74). And HI
In the PPI transmission interface unit 20, Connect =
"1" instruction is given (S75).

At S72, if there is no initial credit value, a connection state check is performed (S77). If no call is being made, the process ends. If a call is being made, the process proceeds to S76 together with S75. In S76, a command to send a credit-ready signal to the HIPPI transmission interface unit 20 is issued, and the process ends.

Returning to FIG. 12, after S41, HIPP
The state of the I transmission FIFO 21 is checked (S42),
If empty, return to S41; otherwise, FIFO2
The transmission HIPPI-BURST is read from 1 (S43). Thereafter, the connection status is checked (S44). If there is no call, it is checked whether there is an error (S45).
Request = “1” is checked (S46), and if not, the process returns to the start. If Request = "1", V
An H-PDU with both bit and Ibit set to “1” is generated (S47), and the connection state of the H-PDU transmission processing unit 30 is set to “waiting for connection” (S48).

In S44, if a call is in progress, HIP
PI-BURST is converted to H-PDU (S49),
An error check is made (S50), and if there is, "1" is set to the Ebit of the HB header (S51). afterwards,
Alternatively, if there is no error in S50, Request is checked (S52), and if "0", D in the HB header is checked.
"1" is set to the bit (S53).

Then, the connection state of the H-PDU transmission processing unit 30 is set to “empty” (S 54), and the HIP
An instruction of Connect = "0" is issued to the PI transmission interface unit 20 (S55).

Thereafter, or if it is not "0" in S52, or after S48, the H-PDU is written into the H-PDU transmission FIFO 31 and the process returns to the start.

[0077]

As described above, according to the present invention, the HI
In the data transfer of the ATM communication device using the PPI interface, the influence of the time required to establish the end-to-end connection due to the load condition of the receiving higher-level device is removed, and the connection time is reduced as much as possible. In addition, by preventing an increase in excess traffic inflow in the Camp On state, it is possible to prevent a decrease in overall communication efficiency and to provide a high-speed ATM communication that has no adverse effect even in simultaneous communication with a plurality of communication partners. There is an effect that makes it possible.

[Brief description of the drawings]

FIG. 1 is a block diagram of an ATM communication device according to an embodiment of the present invention.

FIG. 2 is a sequence diagram showing a state of connection control in the embodiment of the present invention.

FIG. 3 is a sequence diagram showing a state of Camp On in the embodiment of the present invention.

FIG. 4 is an explanatory diagram of data format conversion on the transmission side of the ATM communication device.

FIG. 5 is an explanatory diagram of data format conversion on the receiving side of the ATM communication device.

FIG. 6: HIPPI-Burst, H-PDU and HB
It is a block diagram of -Header.

FIG. 7 is a configuration diagram of an HB-Header and an I-Field.

FIG. 8 is an explanatory diagram of the correspondence between H-PDUs and ATM cells.

FIG. 9 shows an H-PDU in H-PDU reception processing section 70;
It is a flowchart of a process.

FIG. 10 is a flowchart of a state check of the HIPPI reception interface unit 60.

FIG. 11 is a flowchart of a state check of the Camp On FIFO 10;

FIG. 12 shows an H-PDU in the H-PDU transmission processing unit 30.
It is a flowchart of U processing.

FIG. 13 is a flowchart of a state check of the H-PDU reception processing unit 70.

FIG. 14 is a connection configuration diagram of a higher-level device and an ATM communication device using a HIPPI interface.

FIG. 15 is a signal configuration diagram of the HIPPI interface.

FIG. 16 is a sequence diagram showing a state of conventional connection control.

FIG. 17 is a sequence diagram showing a state of conventional Camp On control.

FIG. 18 is a diagram illustrating a connection between a connection and a frame configuration.

FIG. 19 is a connection configuration diagram of a plurality of higher-level devices and an ATM communication device using a HIPPI interface.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ATM network 2, 4 Host device 3, 5, 6, 7 ATM communication device 10 Camp On FIFO 20 HIPPI interface unit 21, 31, 41, 61, 71, 81, 101, 102
FIFO 30 H-PDU transmission processing unit 40 Cell assembling unit 50 ATM line transmission interface unit 60 HIPPI reception interface unit 62 HIPPI-Burst reception monitoring signal 70 H-PDU reception processing unit 72 Communicating cell header information signal 73 Transmission control information signal 80 cell Decomposition unit 90 ATM line reception interface unit 100 Control cell processing unit 110 Control processor 201 Packet including initial credit Ci 301 ATM cell output line 302 ATM cell input line 311, 312 HIPPI transmission interface 321, 322 HIPPI reception interface 401 Connection request packet 402 HIPPI burst

Claims (5)

[Claims] An ATM communication system in which higher-level devices perform connection-type bidirectional communication with each other via an ATM communication device interconnected to an ATM communication network.
In response to the incoming connection connection request from the originating host device transmitted from the originating ATM communication device, the TM communication device establishes a connection with the destination host device when the destination host device is not busy. An ATM communication system comprising means for transmitting a connection request signal and transmitting a connection connection completion signal to the originating ATM communication device. 2. The receiving side higher-level device, wherein the receiving side AT
2. The ATM communication system according to claim 1, further comprising means for sending a connection connection completion signal to said receiving side ATM communication device in response to a connection connection request signal from said M communication device. 3. The receiving-side ATM communication device transmits the connection connection completion signal, and then sends the connection-side ATM communication device.
If there is no connection completion signal from the receiving higher-level device until the data from the transmitting higher-level device transmitted from the M communication device is completely received, the transmitting-side ATM communication device is 3. The method according to claim 2, further comprising means for sending a connection disconnection request.
TM communication system. 4. The receiving-side ATM communication device responds to an incoming connection connection request from a calling-side higher-level device transmitted from the calling-side ATM communication device and responds to a call received by the receiving-side higher-level device. And a storage unit for temporarily storing the connection connection request, wherein the originating ATM communication device receives the connection connection completion signal from the destination ATM communication device without retransmitting the connection connection request. 4. The ATM communication system according to claim 1, further comprising a waiting unit. 5. The receiving-side ATM communication device reads a connection request from the storage unit in response to the termination of the call of the receiving-side higher-level device, and sends a connection connection request request signal to the receiving-side higher-level device. 5. The ATM communication system according to claim 4, further comprising means for transmitting a connection completion signal to said transmitting side ATM communication device.