JPH05128024A - Method for controlling priority of logical channel - Google Patents

Abstract

PURPOSE:To secure a logical channel with priority at the time of an emergency and to attain communication by allocating and connecting an ID registered in a priority level table to an idle logical channel in a group with a priority level. CONSTITUTION:When logical channels are congested in a normal procedure, a packet multiplexing device 3 receiving a user ID sent from a terminal 1 through a line refers to the priority level table 32, and when the ID has been registered, connects the ID to an idle logical channel in the priority level group registered in a logical channel management table 33. When the ID is not registered, the device 3 rejects its connection.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a logical channel priority control method for preferentially controlling a logical channel, and a logical channel priority control method for preferentially controlling a logical channel when a TTY procedure is connected to a packet network or the like. Is.

Recently, personal computer communication has become popular and TTY
The form of connecting the procedure to a packet network or the like is increasing. At that time, there is a demand for a service that allows the user to access the center at any time by setting a priority level at the time of connection.

[0003]

2. Description of the Related Art Conventionally, under the configuration shown in FIG. 4A, a terminal 21 such as a personal computer is connected to a center 23 through a telephone line and a packet multiplexer 22 to receive a service. In this case, the method of dynamically allocating logical channels is CCITT X.264. It is decided by 25 recommendations and PAD
The contents of the command are X. It is decided by 28 recommendations. In accordance with these recommendations, as shown in FIG. 4B, the terminal 21 and the center 23 are connected to transmit and receive data. A brief description will be given below.

In FIG. 4B, the terminal 21 sends a PAD command "XXXX". Is the packet multiplexer 2 that has received the PAD command
2 sends the PAD command response “XXXXX” to the terminal 21.

The terminal 21 indicates that the other party's address is ".00".
Since the logical channel between the packet multiplexer 22 and the center 23 is not empty here, the command "00+" is transmitted. The terminal 21 receiving this determines that it is busy.

[0006]

As described above, regarding the logical channels between the packet multiplexer 22 and the center 23, when a connection request is made from the terminal 21, the logical channels are connected in the order of speed. There was a problem that if there was no sky, you could not connect, even if you tried to connect preferentially in an emergency.

According to the present invention, the logical channels are divided into priority level groups and normal level groups, and when the IDs are registered in advance in the priority level table, they are allocated to empty logical channels of the priority level group and connected. The purpose is to secure a logical channel preferentially and enable communication in an emergency.

[0008]

FIG. 1 is a block diagram showing the principle of the present invention. In FIG. 1, a terminal 1 is a terminal that is connected to a center 4 or the like to exchange data.

Packet multiplexer (packet switch) 3
Is for multiplexing the data sent from the line into packets and transmitting / receiving the packets, and has a priority level table 32 and a logical channel management table 33.

The priority level table 32 is a table for registering an ID (user ID) that permits use of a logical channel of a priority level group. The logical channel management table 33 is a table for managing whether or not the logical channel is in use by dividing it into a normal level group and a priority level group.

[0011]

According to the present invention, as shown in FIG. 1, when the normal logical channel on the center side has no vacancy, the packet multiplexer 3 which has received the user ID sent from the terminal 1 via the line. When it is registered by referring to the priority level table 32, it is connected to an empty logical channel of the priority level group of the logical channel management table 33.

Therefore, the logical channels are divided into a priority level group and a normal level group, and when the ID is registered in the priority level table 32 in advance, it is allocated to an empty logical channel of the priority level group and connected. In an emergency, it becomes possible to preferentially secure a logical channel for communication.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the construction and operation of an embodiment of the present invention will be sequentially described in detail with reference to FIGS.

FIG. 1 is a block diagram showing the principle of the present invention. Figure 1
In the above, the terminal 1 is a terminal such as a personal computer that is connected to the center 4 or the like to exchange data.

Packet multiplexer (packet switch) 2
Is to multiplex the data sent from the line into a packet and transmit / receive it. The packet multiplexer (packet switch) 3 is a multiplexer (conversion) device that is directly connected to the center 4, and includes a logical channel priority control 31, a priority level table 32, a logical channel management table 33, and the like. .. The packet multiplexer 3 uses the logical channel management table 33 here,
A group of logical channels having a high priority level and a group of logical channels having a normal level are separately managed, and a logical channel is established between the center 4 and each terminal 1 to exchange data.

The logical channel priority control 31 refers to the logical channel management table 33 when a connection request is made by the priority level ID (user ID) registered in the priority level table 32, and the priority level group is referred to. It finds an empty logical channel, connects the terminal 1 for which a connection request is made to this logical channel, and performs priority control so as to exchange data with the destination terminal (center).

The priority level table 32 is a table in which an ID (user ID) that permits use of a logical channel of a priority level is registered in advance. The logical channel management table 33 is a table for managing whether or not the logical channel is in use by dividing it into a normal level group and a priority level group (see (b) of FIG. 2).

The priority level logical channel 34 is a logical channel that can be used only by the user (terminal 1) having the ID (user ID) registered in the priority level table 32 and is not normally used.

The normal level logical channel 35 is the terminal 1
It is a logical channel that is normally used from. Center 4
Is a center that provides various services to the terminal 1.

Next, the operation of the configuration of FIG. 1 will be described. , The terminal 1 sends the destination address to the packet multiplexer 2 by the PAD command.

When the normal level logical channel is empty, the packet multiplexer 2 sends the PAD response command ".00+" indicating that the logical channel is empty to the terminal 1.
To send to.

The terminal 1 sends the user ID of the priority level given in advance to the packet multiplexer 2. The packet multiplexer 2 sends the user ID to the packet multiplexer 3
Transfer to. The logical channel priority control 31 of the packet multiplexer 3 that has received the user ID of this priority level refers to the priority level table 32 and determines that the user ID is registered, and the priority of the logical channel management table 33 is given. Find an empty logical channel among the logical channels of the group of levels (assuming that the normal level logical channel is empty).

In, the packet multiplexer 3 sends a CN (connection request) to the center 4. Receives a CA (connection completion response) from the packet multiplexer 3 of the relay destination. , The packet multiplexer 2 sends a connection completion response to the terminal 1.

[0024] sends and receives data to the destination center 4 or the like via the logical channel to which the terminal 1 is connected. As described above, the terminal 1 uses the user ID registered in advance in the priority level table 32 even if the normal level logical channel has no free space, and uses the free logical channel of the priority level as the center 4 or the like. Connect preferentially to send and receive data. As a result, in an emergency, it becomes possible to preferentially communicate using the logical channel of the priority level.

Next, referring to the flowchart of FIG.
The operation of the above configuration will be described in detail. In FIG. 2A, S1 determines whether the user ID is registered in the priority level table 32. This corresponds to the reception of the user ID of FIG. 1 described above, and the logical channel priority control 31 of the packet multiplexing device 3 registers the received user ID in the priority level table 32. It is determined whether or not the user ID. If YES, S
Go to 2. In the case of NO, since it is determined that the user ID is not the priority level user, the fact that the user is busy is notified to the terminal 1 in S4. User ID terminal 1
To the effect that there is no empty logical channel (PAD response command “00+” during busy).

In S2, the user ID is found to be the priority level ID in the case of YES in S1, so the logical channel management table 33 of FIG. Determine if there is a logical channel of. In the case of YES, the destination is called using the empty logical channel in S3, the connection is completed in response to the destination terminal 1 (center 4) sending out the CA packet, and the communication between the two is performed. To do. On the other hand, in the case of NO, since there is no empty logical channel with a high priority level, the terminal 1 is informed that it is busy in S4.

FIG. 2B shows a logical channel management table. The logical channel management table 33 manages for each logical channel whether the logical channel group is in use by dividing into two groups, a normal level group of LCGN = 0 and a priority level group of LCGN = 1. .. When using an empty logical channel, the busy flag is set to 1 to make it in use, and the logical channel is used to connect between the terminal 1 and the center 4. After use, reset the in-use flag to 0 and return it to empty.

Next, a case where the user ID is registered in the priority level table 32 and a case where the user ID is not registered will be described with reference to FIG. At this time, it is assumed that there is no empty logical channel at the normal level.

FIG. 3A shows a case where the user ID is registered in the priority level table 32. In FIG. 3A, the terminal 1 uses the PAD command “.0”.
0+ "is sent to the packet multiplexer 2. Here, P
AD command ".00" is a shortened destination address "0"
“0” is represented, and “+” is a command.

Since there is no empty logical channel on the center side, the packet multiplexer 2 sends a PAD response command "00+" to the terminal 1, which indicates that there is no empty logical channel.

Is a priority channel use request ID by the terminal 1.
“VIP +” is sent to the packet multiplexer 2, and the packet multiplexer 2 sends VIP to the packet multiplexer 3.

Sends CN (Call Incoming, connection request). This is because the logical channel priority control 31 of the packet multiplexing device 3 which has received "VIP +" in step 11 refers to the priority level table 32 and determines that this user ID "VIP" is registered, and B) The empty logical channel of the priority level of the logical channel management table 33 of b) is found, its busy flag is set to 1, and CN (connection request) is sent to the destination via this logical channel.

Receives a CA (Call Accepted, connection completion response). This receives CA (connection completion response) in response to sending CN to the logical channel. Indicates that the packet multiplexer 2 connects to the terminal 1
To send to.

In, the terminal sends DATA (data). Causes the packet multiplexer 3 to send the DT (data) sent to the logical channel to the destination.

As described above, since the user ID "VIP" sent from the terminal 1 is registered in the priority level table 32, the empty logical channel of the priority group of the logical channel management table 33 is used and the normal level of Even if there is no empty logical channel, it is possible to send or receive data to the destination (center 4 or the like) using the logical channel of the priority level.

FIG. 3B shows the case where the user ID is not registered in the priority level table 22. In FIG. 3B, the terminal 1 uses the PAD command “.0”.
0+ "is sent to the packet multiplexer 2. Here, P
AD command ".00" is a shortened destination address "0"
“0” is represented, and “+” is a command.

Since there is no empty logical channel on the center side, the packet multiplexer 2 causes the PAD response command "0".
0+ "(busy) is sent to the terminal 1. 'is the channel use request ID of the terminal 1 at the normal level.
“AAA +” is sent to the packet multiplexer 2, and the packet multiplexer 2 sends AAA to the packet multiplexer 3.

'Is a logical channel priority control 3 of the packet multiplexer 3 which has received the user ID "AAA"in'
1 refers to the priority level table 32 and this user ID
When it is determined that "AAA" is not registered, the call disconnection packet CQ is sent to the packet multiplexer 2, and the packet multiplexer 2 sends "00+" (indicating busy) to the terminal 1.

As described above, since the user ID "AAA" sent from the terminal 1 is not registered in the priority level table 32, the busy state is sent to the terminal 1.

[0040]

As described above, according to the present invention,
Since the logical channels are divided into a priority level group and a normal level group, and the IDs registered in advance in the priority level table 32 are used, the empty logical channels of the priority level group are allocated and connected. ,
In an emergency, it is possible to preferentially secure a logical channel for communication. Thus, for example, in a system in which a plurality of terminals communicate with a center, a normal level logical channel that can be freely used by a terminal and a priority level logical channel that cannot be freely used are grouped, and this priority is given in an emergency. It becomes possible to secure the communication path by using the logical channel of the level. The ID (user ID) that can use the logical channel of this priority level is opened only to a specific user, or the ID is generally opened,
There is a usage mode such as charging higher when performing priority control.

[Brief description of drawings]

FIG. 1 is a principle configuration diagram of the present invention.

FIG. 2 is a flowchart for explaining the operation of the present invention.

FIG. 3 is an operation explanatory diagram of the present invention.

FIG. 4 is an explanatory diagram of a conventional technique.

[Explanation of symbols]

 1: Terminals 2, 3: Packet multiplexer (packet switch) 31: Logical channel priority control 32: Priority level table 33: Logical channel management table 34: Priority level logical channel 35: Normal level logical channel 4: Center

Claims (1)

[Claims] 1. A logical channel priority control method for preferentially controlling a logical channel, wherein a priority level table (32) for registering an ID that permits use of a logical channel of a priority level group, and a normal level and a priority level group The packet multiplexer (3) is provided with a logical channel management table (33) for separately managing whether or not the logical channel is in use. In the normal procedure, when the logical channel is congested, the line from the terminal (1) is Priority level of the logical channel management table (33) when the packet multiplexer (3) that received the user ID sent via the network is registered by referring to the priority level table (32) A logic characterized in that it is configured to connect to an empty logical channel of a group of and refuse the connection when it is not registered. Channel priority control method.