JPH05122675A - Catv control system for atm exchange network - Google Patents

Abstract

PURPOSE:To fetch a CATV service as one for ATM exchange network. CONSTITUTION:This CATV control system provided with a CATV head end device 2 sending CATV information independent at every channel on the ATM exchange network 1 and a TV terminal 3 capable of receiving the CATV information can receive the CATV service and sent the required channel information to the ATM exchange network 1 by setting it during the call signal from the TV terminal 3. Then, the ATM exchange network 1 analyzes the information from the TV termibal 3 to be connected to the channel of the CATV head end device 2 corresponding to the required channel information, thereby providing the CATV information from the CATV head end device 2 to the TV terminal 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a CA in an ATM switching network.
It relates to a TV control system.

[0002]

2. Description of the Related Art ATM (Asynchronous Transfer Mode) is promising as a basic technology for economically realizing a broadband communication network, but provides various services in a switching network (ATM switching network) using such an ATM system. It is in the stage of being considered in various fields for the realization of.

[0003] By the way, conventionally, there is a CATV (cable television) service for providing television information to a TV terminal by connecting a TV (television) terminal and an information source via a cable. Then, there is a request to incorporate the CATV service as a service of the ATM switching network.

[0004]

However, in order to take in the CATV service as a service of the ATM switching network as described above, it is not only necessary to connect the TV terminal and the information source to the ATM switching network, but various types are required. It is necessary to devise. The present invention was devised under such circumstances, and it is possible to incorporate a CATV service as a service of an ATM switching network.
It is an object to provide a CATV control method in the M switching network.

[0005]

FIG. 1 is a block diagram of the principle of the present invention. In FIG. 1, reference numeral 1 is an ATM switching network, and this ATM switching network 1 provides independent CATV information for each of a plurality of channels. The CATV head-end device 2 that can be sent and the TV terminal 3 that can receive the CATV information sent through the CATV head-end device 2 are configured to be accommodated.

Here, the CATV headend device 2 is
A dedicated virtual channel identifier is assigned to each of its own channels. In addition, 4 is a concentrator for concentrating a plurality of TV terminals 3.

[0007]

In the above-described CATV control system in the ATM switching network of the present invention, as shown in (1) of the signal sequence diagram of FIG. 2, the CATV service can be received and desired channel information is transmitted to the TV. It is set in the calling signal from the terminal 3 and sent to the ATM switching network 1.

Then, as shown in (2) of FIG.
In the M switching network 1, the above information from the TV terminal 3 is analyzed, and the CA corresponding to the channel information desired by the TV terminal 3 is analyzed.
The CATV information from the CATV headend device 2 is provided to the TV terminal 3 by connecting to the channel of the TV headend device 2 (each channel is assigned a dedicated virtual channel identifier for each channel) (claim) Items 1, 3). In addition, in (2) of FIG.
PROC is a response signal, and CONN is a connect signal.

If the user wants to receive the information of another channel while receiving the information of the channel which is the TV terminal 3, the channel switching information is sent from the TV terminal 3 as shown in (3) of FIG. It is defined as a new information element in the layer 3 message and sent to the ATM switching network 1. Then, ATM
In the switching network 1, the channel switching information from the TV terminal 3 is analyzed, and the channel of the CATV headend device 2 corresponding to the channel information desired by the TV terminal 3 (each channel is a dedicated virtual channel identifier for each channel). The CATV information from the CATV headend device 2 is provided to the TV terminal 3 by connecting to the TV terminal 3 (claims 2 and 3).

Further, when the TV terminal 3 ends the CATV service, as shown in (4) of FIG.
The TV service end information is set in the disconnection signal from the TV terminal 3 and sent to the ATM switching network 1.

In FIG. 2 (4), REL is a response signal and REL COMP is a response completion signal. Next, in the ATM switching network 1, the CAT from the TV terminal 3 is sent.
Analysis of V service end information, TV terminal 3 and CATV
The path connection with the headend device 2 is disconnected (claim 4).

Further, when the CATV service is terminated from the CATV headend device 2 side, as shown in FIG. 3, the CATV headend device 2 disconnects the physical connection with the ATM switching network 1 (claim 5). ). Also in FIG. 3, REL is a response signal and REL COMP is a response completion signal.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 4 is a block diagram showing an embodiment of the present invention. In FIG. 4, 1'is an ATM switch (ATM switch network).
The ATM exchange 1'has a main control unit 6 and a main storage unit 7. The ATM exchange 1'concentrator 4 and two terminal interfaces 5 arranged in parallel.
The CATV head-end device 2 is accommodated via the LAN, and the TV terminal 3 is accommodated via the concentrator 4'and two terminal interfaces 5'arranged in parallel.

The ATM switch 1'is an ATM type switch, and the CATV headend device 2 has independent CATV information (for example, video information) for each of a plurality of channels.
The CATV information source 2A is connected to the CATV headend device 2.

The TV terminal 3 is the CATV headend device 2.
The CATV headend device 2 of the CATV headend device 2 has a changeover switch (channel changeover unit) for enabling the information selection. By receiving the CATV information corresponding to the channel and switching the switch, other CATV information can be received.

With the above-described configuration, since information is provided to each channel of the CATV headend device 2 in advance for each of a plurality of channels, a dedicated virtual channel identifier (VCI) is assigned to each channel of the dedicated network. Give the position. After that, as shown in (1) of FIG.
The call signal (S) from the TV terminal 3 of the subscriber indicates that the ATV service can be received and the desired channel information.
ETUP) and send it to the ATM switching network 1.

That is, the CATV subscriber can be identified when the layer 3 message is set up (SET UP) [see FIG. 5 (A) and FIG. 7] by the signaling process executed when the ISDN subscriber makes a call. Therefore, the value of the symmetry of the transfer capability information element (see octets 6 to 10 in FIG. 7) indicating the request for the transfer function provided by the network in the setup signal is set to be asymmetrical (octet 4b in FIG. 8). (See).

The source channel of the CATV headend device 2 to be received is set in the keypad facility information element for carrying IA5 characters, etc., which is entered from the TV terminal keypad in the setup signal of FIG. 5 ( Octet 3 in FIG. 9). These pieces of information are provided at the time of setup and sent to the ATM switching network 1 side.

FIG. 7 is a diagram for explaining the information element structure of the setup signal, FIG. 8 is a diagram showing the format and coding of the transfer capability information element in the setup signal, and FIG. 9 is a keypad facility in the setup signal. It is a figure which shows the format and coding of an information element.

Further, VPI / in the setup signal
The format and coding of the VCI identifier and band are shown in FIGS. 10 and 11, respectively.
Then, as shown in (2) of FIG. 5, in the ATM switching network 1, the above information from the TV terminal 3 is analyzed and the channel of the CATV headend device 2 corresponding to the channel information desired by the TV terminal 3 is analyzed. (A dedicated virtual channel identifier is assigned to each channel).

That is, first, the setup signal of the layer 3 message of the calling information from the subscriber TV terminal 3 is set to A
Analysis is performed on the TM switching network 1 side [(B) of FIG. 5]. As a result, if the asymmetry of the transmission capability information element is confirmed, CA
The TV subscriber TV terminal 3 analyzes the reception channel, and then the response signal (CALL PROC) and the connect signal (CON
N) is transmitted to the TV terminal 3 [(C) in FIG. 5,
(D)], a path to the corresponding channel [(E) in FIG. 5] of the CATV headend device 2 is connected [(F) in FIG. 5].

This connection is made in the same manner as a general call connection in the ATM switching network 1. However, the parameter values set at the time of connection are unique to the CATV headend device 2 (the handling of a dedicated line is Value). After these operations, as shown by the thick line in FIG.
The V terminal 3 and the CATV headend device 2 are path-connected, and the CAT from the CATV headend device 2
The V information is provided to the TV terminal 3 [(G) in FIG. 5].

If the user wants to receive information of another channel while receiving information of the channel of the TV terminal 3, the TV terminal 3 first switches as shown in (3) of FIG. The switch is operated [(H) in FIG. 5]. By the operation of this switch, the INFO message in the layer 3 message including the channel switching request from the subscriber defined as the new information element is sent from the TV terminal 3 to the AT.
This is notified to the M switching network 1 [(I) in FIG. 5].

Upon receiving this notification, the ATM switching network 1 analyzes the keypad facility of the information element to determine the switching channel, and similarly to the previous connection, the CATV head corresponding to the channel information desired by the TV terminal 3. End device 2
The path connection is made to the channel No. 1 and the reception information at the TV terminal 3 is switched [(J) in FIG. 5]. After these operations, the CATV information from the CATV headend device 2 is provided to the TV terminal 3 [(K) in FIG. 5].

When the TV terminal 3 terminates the CATV service, as shown in (4) of FIG. 5, first, the fact is notified from the TV terminal 3 to the ATM switching network 1.
The call termination notification is carried out in the same manner as the ISDN subscriber's call termination process. That is, the CATV service end information is T
It is set in the disconnection signal [(L) in FIG. 5: DISC signal] from the V terminal 3 and transmitted to the ATM switching network 1. Then, in the ATM switching network 1, the CATV service end information from the TV terminal 3 is analyzed and the path connection between the TV terminal 3 and the CATV headend device 2 is disconnected [(M) in FIG. 5].

After that, the response signal (REL signal) [(N) in FIG. 5] shown in FIG. 5 is transmitted from the ATM switching network 1 to the TV terminal 3.
And the response completion signal (RE
The LCOMP signal) [(O) in FIG. 5] is sent to the ATM switching network 1 as a reply. With such an operation, the TV terminal 3 ends the CATV service.

Further, as shown in FIG. 6, when the CATV service is terminated from the CATV headend device 2 side,
Since the CATV headend device 2 is positioned as a leased line, it cannot perform the processing required for the normal call termination processing.
Therefore, instead of notifying the ATM switching network 1 of that fact and stopping the service to each TV terminal subscriber, the CATV headend device 2 physically connects to the ATM switching network 1. Disconnect.

As a result, the transfer information of the designated channel [see FIG.
(P)] is stopped on the CATV headend device 2 side [(Q) in FIG. 6]. Then, since the CATV headend device 2 is positioned as a leased line, the service stoppage is detected in the hardware physically connected to the CATV headend device 2 in the ATM switching network 1 (see FIG. 5). (R): Layer 1 level fault].

Then, when the ATM switching network 1 detects the service stop, the ATM switching network 1 carries out the forced release of the subscriber to the connecting subscriber [(S) of FIG. 6] and the response signal (shown in FIG. 6). REL) [(T) in FIG. 6] is sent from the ATM switching network 1 to the TV terminal 3.

Then, the response completion signal (R
(EL COMP signal) [(U) in FIG. 6] is sent to the ATM switching network 1 as a reply to the originating TV terminal 3.
Processing similar to the ISDN general call disconnection processing method is performed. With such an operation, the service is stopped from the CATV headend device 2.

In this way, CATV capable of transmitting independent CATV information for each of a plurality of channels to the ATM switching network 1.
In a housing in which the headend device 2 and the TV terminal 3 capable of receiving CATV information transmitted through the CATV headend device 2 are accommodated, a dedicated virtual channel identifier is assigned to each channel of the CATV headend device 2. Then, the reception of the CATV service and the desired channel information are set in the calling signal from the TV terminal 3 and transmitted to the ATM switching network 1.
In the switching network 1, the above information from the TV terminal 3 is analyzed, and the CA corresponding to the channel information desired by the TV terminal 3 is analyzed.
By connecting to the channel of the TV headend device 2, it becomes possible to provide the CATV information from the CATV headend device 2 to the TV terminal 3.

Then, in the system described above,
In the case where a dedicated virtual channel identifier is assigned to each channel of the V headend device 2, the TV terminal 3
If the user wants to receive the information of another channel while receiving the information of the channel that is, the channel switching information is set to the TV terminal 3
Defined as a new information element in a layer 3 message from the TV terminal 3 and sent to the ATM switching network 1. Then, the ATM switching network 1 analyzes the channel switching information from the TV terminal 3, and the TV terminal 3 requests it. C corresponding to the channel information
By connecting to the channel of the ATV headend device 2, it becomes possible to provide the CATV information of another channel from the CATV headend device 2 to the TV terminal 3.

Also, the CATV service end information is sent to the TV.
It is set in the disconnection signal from the terminal 3 and sent to the ATM switching network 1. Then, in the ATM switching network 1, the CATV service end information from the TV terminal 3 is analyzed, and the TV terminal 3 and the CATV headend are connected. The CATV service can be terminated by the TV terminal 3 by disconnecting the path connection with the device 2.

Conversely, the CATV headend device 2 disconnects the physical connection with the ATM switching network 1, whereby the CATV service can be terminated from the CATV headend device 2 side. As a result, it becomes possible to combine the TV terminal 3 and the CATV headend device 2 in the ATM switching network 1, and even in the ATM switching network 1, C
It becomes possible to realize the provision of the ATV service.

[0035]

As described above in detail, according to the CATV control system in the ATM switching network of the present invention, the ATM switching network is
A CATV headend device capable of transmitting independent CATV information for each of a plurality of channels, and a TV capable of receiving the CATV information transmitted through the CATV headend device.
In a terminal that accommodates a terminal, a dedicated virtual channel identifier is assigned to each channel of the CATV headend device, CATV service reception is possible, and desired channel information is transmitted from a TV terminal as a call signal. Set to the inside and send out to the ATM switching network. Then, in the ATM switching network, the above information from the TV terminal is analyzed and connected to the channel of the CATV headend device corresponding to the channel information desired by the TV terminal. By CATV
There is an advantage that CATV information from the headend device can be provided to the TV terminal (claims 1 and 3).

Then, in the above system, the CAT
If a dedicated virtual channel identifier is assigned to each channel of the V headend device, and if it is desired to receive information of another channel while receiving information of a channel which is a TV terminal, the channel switching information is changed to TV. Defined as a new information element in the layer 3 message from the terminal,
It is sent to the ATM switching network, and then, in the ATM switching network, T
By analyzing the channel switching information from the V terminal and connecting to the channel of the CATV headend device corresponding to the channel information desired by the TV terminal, the CATV information of the other channel from the CATV headend device is transmitted to the TTV.
There is an advantage that it can be provided to the V terminal (claims 2 and 3).

Further, the CATV service end information is sent to the TV.
It is set in the disconnection signal from the terminal and sent to the ATM switching network. Then, in the ATM switching network, the above C from the TV terminal is sent.
Analyzes the ATV service end information, TV terminal and CAT
There is an advantage that the CATV service can be terminated by the TV terminal by disconnecting the path connection with the V headend device (claim 4).

On the contrary, the CATV headend device is
By disconnecting the physical connection with the TM switching network, C
There is an advantage that the CATV service can be terminated from the ATV headend device side (Claim 5). As a result, AT
It is possible to combine a TV terminal and a CATV headend device in the M switching network, and even in the ATM switching network, CAT.
There is an advantage that the provision of V service can be realized.

[Brief description of drawings]

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

FIG. 2 is a signal sequence diagram for explaining the principle of the present invention.

FIG. 3 is a signal sequence diagram for explaining the principle of the present invention.

FIG. 4 is a block diagram showing an embodiment of the present invention.

FIG. 5 is a signal sequence diagram for explaining the operation of the embodiment of the present invention.

FIG. 6 is a signal sequence diagram illustrating the operation of the embodiment of the present invention.

FIG. 7 is a diagram showing a format and coding according to an embodiment of the present invention.

FIG. 8 is a diagram showing a format and coding according to an embodiment of the present invention.

FIG. 9 is a diagram showing a format and coding according to an embodiment of the present invention.

FIG. 10 is a diagram showing a format and coding according to an embodiment of the present invention.

FIG. 11 is a diagram showing a format and coding according to an embodiment of the present invention.

[Explanation of symbols]

 1 ATM Switch Network 1'ATM Switch 2 CATV Headend Device 2A CATV Information Source 3 TV Terminal 4, 4'Concentrator 5,5 'TV Terminal Interface Device 6 Main Controller 7 Main Memory 7

Claims (5)

[Claims] 1. A CATV headend device (2) capable of sending independent CATV information for each of a plurality of channels to an ATM switching network (1), and a CATV information sent through the CATV headend device (2). In a case where a TV terminal (3) capable of receiving is accommodated, the CATV service can be received and desired channel information is set in a call signal from the TV terminal (3). It is sent to the ATM switching network (1), and then, in the ATM switching network (1), the TV terminal (3)
By analyzing the above information from the CATV and connecting it to the channel of the CATV headend device (2) corresponding to the channel information desired by the TV terminal (3),
A CATV control system in an ATM switching network, characterized in that CATV information from a headend device (2) is provided to the TV terminal (3). 2. When it is desired to receive information of another channel while receiving information of a channel which is the TV terminal (3),
The channel switching information is transferred to the layer 3 from the TV terminal (3).
The ATM is defined as a new information element in the message.
It is sent to the switching network (1), and then the ATM switching network (1)
Then, by analyzing the channel switching information from the TV terminal (3) and connecting to the channel of the CATV headend device (2) corresponding to the channel information desired by the TV terminal (3), CATV information from the CATV headend device (2) is provided to the TV terminal (3), C in the ATM switching network according to claim 1.
ATV control system. 3. AT according to claim 1 or 2, characterized in that a dedicated virtual channel identifier is assigned for each channel of the CATV headend device (2).
CATV control method in M switching network. 4. When the TV terminal (3) ends the CATV service, the CATV service end information is sent to the TV.
It is set in the disconnection signal from the terminal (3) and sent to the ATM switching network (1). Then, in the ATM switching network (1), the CATV service end information from the TV terminal (3) is sent. 2. The CATV control system in an ATM switching network according to claim 1, wherein the path connection between the TV terminal (3) and the CATV headend device (2) is analyzed and disconnected. 5. When the CATV service is terminated from the CATV headend device (2) side, the CATV headend device (2) disconnects the physical connection with the ATM switching network (1). The AT according to claim 1, characterized in that
CATV control method in M switching network.