JP2637279B2 - Communication channel management method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a communication apparatus that performs communication by multiplexing a plurality of communication channels on an ISDN line, and assigns communication channels to users and performs communication channel communication. The present invention relates to a communication channel management method that enables setting of attributes.

[Conventional technology]

In the ISDN communication service, it is possible to set a protocol to be used for each of a plurality of B channels and communication attributes such as an exchange mode (circuit exchange / packet exchange), an information transfer speed, and a speed matching method. ISDN User Network Interface for Controlling CCITT Recommendation
Specified by I.451.

In the case of a line other than ISDN, line control processing such as line initialization / termination processing depends on a protocol type and a line type.

As described above, in the conventional technology, line control is generally performed as part of protocol processing. Therefore, when protocol processing is implemented on an ISDN line, each protocol processing unit follows each I.451 interface. Usually, call control is performed independently as line control processing.

[Problems to be solved by the invention]

In the prior art in which the protocol processing unit performs call control as line control processing, the protocol processing unit controls the D channel for managing the delivery of the B channel to the user. Therefore, when a plurality of communication protocol processes are to be realized, each protocol processing unit controls the same D channel to control the B channel used by each protocol processing unit. For this reason, control competition for the D channel occurs between them, so that line multiplexing for realizing a plurality of communication protocols on the same line and use of the same channel in time series by a plurality of protocols are not possible. It was impossible.

In the ISDN communication service, when a plurality of communication channels are set on the same line, each communication channel is independent, and each communication channel can be used with a different communication protocol. Furthermore, when focusing on a single communication channel, the use of the channel, that is, the protocol to be used is not specified, so when the use of one communication channel is completed, the communication channel can be used by another protocol. It is.

Therefore, the present invention solves the contention of the D channel control between the protocol processing units by making the call control processing independent of the protocol processing unit and centrally managing the D channel control, and enables a plurality of communication units on the same line. It is an object of the present invention to provide a communication channel management method that enables line multiplexing to realize a communication protocol and time-series use of the same channel by a plurality of protocols.

[Means for solving the problem]

In order to achieve the above object, according to the present invention, in a communication device that performs communication by multiplexing a plurality of communication channels on an ISDN line, assignment of communication channels to users and setting of communication attributes of communication channels are performed as call control processing. A call control processing unit for managing the communication protocol processing independently is provided.

[Action]

In the prior art, the call control process is performed as part of the line control process in the protocol processing unit. In the present invention, the call control process is performed independently of the protocol process. Specifically, call control processing based on the I.451 interface is centrally managed, and management of payout / refund to communication channel users, communication attributes of each communication channel, and management of usage are handled as protocol processing. Perform independently.

〔Example〕

FIG. 1 is a block diagram showing an outline of an embodiment of the present invention.

In the figure, 1 is a protocol processing unit (A), 2 is a protocol processing unit (B), 3 is a call control processing unit, 4 is a network side,
It is. The protocol processing units (A) and (B) correspond to users, and the call control processing unit 3 is provided according to the present invention. In the ISDN, an example will be described in which a B1 channel, a B2 channel, and a D channel are present on the same interface. The B channel can transmit and receive circuit-switched and packet-switched information. It is used to transfer control signals for circuit switching and packet switching user information.

 Hereinafter, the operation will be described.

After performing the D channel initialization processing, the call control processing unit 3 waits for a D channel use start declaration from the users 1 and 2. Upon receiving the D channel use start declaration from the users 1 and 2, the communication attributes of the user and the usage method are recorded.

Thereafter, the call control processing unit 3 waits for a B-channel allocation request (calling) from the user 1 when the user 1 makes a call, and from the D-channel when the user 2 receives a call. Wait for a B channel incoming message.

When the user 1 makes a call and there is a B channel allocation request (call) from the user 1, the call control processing unit 3 transmits a call message to the D channel,
The B channel is assigned to the user 1.

In the case where the user 2 is the called party and the call control processing unit 3 receives the incoming call message of the B channel from the D channel, the D channel use start declaration made in advance by the user 2 is also sent. Then, after identifying the user who needs the B channel (in this case, 2) and performing incoming call communication, it waits for a B channel allocation request (incoming call response) from the user 2. Thereafter, when a B channel allocation request (call response) is made from the user 2, the channel is allocated to the user 2.

Further, when the user 1 or 2 has finished using the B channel, the user 1 or 2 issues a B channel release request to cancel the channel allocation request. By this processing, the B channel can be assigned to another protocol thereafter.

FIG. 2 and FIG. 3 are explanatory diagrams showing examples of the user interface provided by the call control processing unit 3 provided according to the present invention. 2 and 3, <information name> represents information passed from the user to the call control processing unit, and {information name}.
Represents information passed from the call control processing unit to the user.

FIG. 2 shows a specific example of an instruction from the user to the call control processing unit. As an example, "D channel use start declaration"
This instruction is described as a symbol “INIT_DCH”. By this instruction, the information passed from the user to the call control processing unit includes <own ISDN address>, <incoming call destination information>, <protocol information> It indicates that there is. Hereinafter, the same applies.

FIG. 3 shows a specific example of an instruction from the call control processing unit to the user. An example of an instruction of "incoming call notification" will be described. This indicates that there are {your ISDN address}, {other ISDN address}, {protocol information}, {user information}, and {call number}. Hereinafter, the same applies.

FIG. 4 is a sequence diagram showing a sequence when the user interface described with reference to FIGS. 2 and 3 is used.

It is to be noted that the outline is as follows. That is, each protocol processing unit that is a user of the call control registers the ISDN address to be used and its own protocol information by the INIT_DCH system call.

When each protocol processing unit performs a calling process, an ISDN address is designated and an ASGN_BCH (calling) system call is requested to allocate a B channel.

When a B channel incoming call request is received from the communication partner,
Protocol information and IS included in the incoming call notification message
It performs mapping with the INIT_DCH system call issuer based on the DN address, and notifies the corresponding protocol processing unit of the incoming call. Upon receiving the incoming call notification, the protocol processing unit
Request the allocation of the B channel by the ASGN_BCH system call.

FIG. 5 is an explanatory diagram showing a relationship between each system call (user interface) and issuance of a call control message according to the CCITT I.451 interface.

〔The invention's effect〕

According to the present invention, in a communication device that performs communication by multiplexing a plurality of communication channels on an ISDN line, a conflict of D-channel control is solved. Thus, time-series use of a plurality of protocols on the same channel becomes possible.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an outline of an embodiment of the present invention. FIGS. 2 and 3 are explanatory diagrams showing an example of a user interface provided by a call control processing unit provided according to the present invention. The figure is a sequence diagram showing the sequence when using the user interface.
FIG. 4 is an explanatory diagram showing a relationship with issuance of a call control message according to the CCITT I.451 interface. Description of symbols 1,2: Protocol processing unit (user), 3: Call control processing unit, 4: Network side

Claims (1)

(57) [Claims] In a communication apparatus for performing communication by multiplexing a plurality of communication channels on an ISDN line, assignment of communication channels to users and setting of communication attributes of communication channels are independent of communication protocol processing as call control processing. Communication channel management characterized in that a plurality of communication protocol processes coexist on the same line and that a plurality of protocols of the same channel can be used in chronological order by providing a call control processing unit for managing the communication channel. method.