KR20020048500A - Method of Broadcasting channel controlling in Access Networks - Google Patents

Abstract

PURPOSE: A broadcasting channel controlling method in an access network is provided to effectively use a limited band width between an optical line terminal and an optical network unit. CONSTITUTION: An optical network unit is initialized according to a configuration information request message received from a service user terminal. An optical line terminal is initialized according to the configuration information request message requested by the optical network unit. The optical network unit is provided with service requested by the service user terminal from the optical line terminal and offers the service to the service user terminal. The optical line terminal provides corresponding service requested by the optical network unit.

Description

Method of controlling broadcasting channels in access network {Method of Broadcasting channel controlling in Access Networks}

The present invention relates to a method for controlling a broadcast channel in an access network used when providing a broadcast service through an access network. More specifically, the present invention provides a method for providing a broadcast channel in an access network effectively using a limited bandwidth between an OLT and an ONU. It is about.

The broadcast channel control method in an access network according to the prior art not only terminates a broadcast channel in an optical network unit (ONU) in the access network, but also allocates a fixed bandwidth to an optical line terminal (OLT) and an ONU for a broadcast service. Allocate the remaining bandwidth for other communication services. For example, if the connection between OLT and ONU is configured as STM4c (622Mbps), and all 60 broadcast channels (6Mbps per channel) are allocated, the broadcast service occupies 360Mbps, which is 50% of the total bandwidth. This causes a waste of bandwidth due to OLT and ONU due to the reason that even the broadcast channel which the service user is not watching is downloaded to the ONU. This results in reducing the allowed bandwidth of the Internet or other services.

SUMMARY OF THE INVENTION An object of the present invention for solving the problems of the prior art is to terminate a broadcast channel accessed by a service user at an ONU in an access network and to terminate a broadcast channel not yet accessed at an OLT, thereby effectively limiting a limited bandwidth between the OLT and the ONU. It is to provide a broadcast channel control method in an access network that can be used.

1 is an access network configuration diagram,

2 is a block diagram of a communication protocol stack;

3A is a flowchart of a configuration information related message between an OLT and an ONU in a broadcast channel control method in an access network according to an embodiment of the present invention;

3B is a flowchart of a broadcast channel selection related message between an OLT and an ONU in a broadcast channel control method in an access network according to an embodiment of the present invention;

3C is a flowchart of a broadcast channel selection related message between a user terminal and an access network in a broadcast channel control method in an access network according to an embodiment of the present invention;

4 is a flowchart illustrating an initialization process of an ONU in a broadcast channel control method in an access network according to an embodiment of the present invention;

5 is a flowchart illustrating an initialization process of an OLT in a broadcast channel control method in an access network according to an embodiment of the present invention;

6 is a flowchart illustrating a service providing process of an ONU in a broadcast channel control method in an access network according to an embodiment of the present invention;

7 is a flowchart illustrating a service providing process of an OLT in a broadcast channel control method in an access network according to an embodiment of the present invention;

8A through 8D are diagrams of encoding formats of messages used in a broadcast channel control method in an access network according to an embodiment of the present invention.

※ Explanation of code about main part of drawing ※

110: user terminal

120: access network

121: Optical Network Unit (ONU)

122: OLT (Opticla Line Terminal)

130: CATV HE (Head end)

According to an aspect of the present invention, there is provided a method for controlling a broadcast channel in an access network including an OLT and an ONU to provide a corresponding service of the OLT and an ONU to a service user terminal, the configuration information received from the service user terminal. In response to the request message, initializing the ONU; Initiating the OLT according to the configuration information request message requested from the ONU; A third step in which the ONU receives the corresponding service requested by the service user terminal from the OLT and provides the service to the service user terminal; The OLT includes a fourth step of providing a corresponding service requested by the ONU.

Preferably, in a recording medium comprising an OLT and an ONU, and storing a program that can be executed by a computer to perform a broadcast channel control method in an access network that provides a corresponding service of the OLT and ONU to a service user terminal. A first step of initializing the ONU according to a configuration information request message received from the service user terminal; Initiating the OLT according to the configuration information request message requested from the ONU; A third step in which the ONU receives the corresponding service requested by the service user terminal from the OLT and provides the service to the service user terminal; The OLT is provided with a computer-readable recording medium storing a program, characterized in that it comprises a fourth step of providing the service requested by the ONU.

Hereinafter, a message sent by the service user terminal to download the corresponding program channel information from the ONU will be referred to as a 'configuration information request message', and the ONU transmits the program channel information to the service user terminal and then sends the message ' Configuration Information Response Message, and the message sent by the ONU to obtain the information from the OLT is called the 'program transfer request message'.After the OLT sends the information to the ONU, the message sent is called Response message.

Hereinafter, a broadcast channel control method in an access network according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. 1 is a block diagram illustrating an access network for explaining a broadcast channel control method in an access network according to the present invention.

As shown, a plurality of service user terminals 110 and an optical network unit (ONU) in the access network 120 (hereinafter referred to as ONU, 121) and OLT (optical line terminal: light terminal, hereinafter OLT) Box 122), CATV-HE (Head End, 130), CATV-HE 130 and OLT 122 is connected to the STM-1 or STM-4C, OLT 122 and ONU 121 Is connected to STM4c, and ONU 121 and service user terminal 110 are connected to xDSL, E1, and the like.

In total, the CATV-HE 130 downloads all broadcast programs to the access network 120, and the access network 120 of all the received broadcast programs, the service user terminal 110 of the broadcast program desired by a particular service user Provided by.

FIG. 2 is a block diagram of a communication protocol stack which is mutually transmitted and received between the OLT and the ONU shown in FIG. This is the same as the zapping protocol stack structure established by the Digital Audio Visual Interactive Council (DAVIC) to allow service users to freely set broadcast channels, but among them, the channel control layer (210) accepts the SDB-CCP (aka zapping) protocol in the existing DAVIC 1.3.1 standard, but terminates the broadcast channel in the OLT, not ONU, and only from the broadcast channel requested by the service user, from OLT to ONU Perform technical control process to download the program.

For reference, DAVIC is an international non-profit organization formed in 1994 aimed at internationally standardizing interfaces and protocols for providing various services in interactive systems.

3A to 3C are flowcharts for messages transmitted and received between an OLT and an ONU used in a broadcast channel method in an access network according to the present invention. First, FIG. 3A is a flowchart of a configuration information message, in which the configuration information message is used to download static information (broadcast channel and broadcast channel-specific connection information) from an OLT for initialization of an ONU. This is the message that ONU uses to request this information from the OLT. As shown, when the OLT first sends a Configuration Information Request message (Configuration Information Request) to the ONU (S301), the ONU provides a corresponding message (Configuration Information Response) including the relevant static information to the ONU (S302).

3B is a flowchart of a broadcast channel selection message transmitted and received between an OLT and an ONU. When a broadcasting program ID of a corresponding program requested by a service user terminal is not downloaded, the ONU is a OLT video stream of the broadcast channel. This message is used when downloading request for. As shown, when the ONU transmits a program select request to the OLT (S303), the OLT provides a corresponding message (Program Select Response) including information on the video stream of the corresponding broadcast channel to the ONU. (S304).

3C is a flowchart of a message transmitted and received between a service user terminal and an ONU in an access network. The broadcast channel selection message is used when the service user terminal notifies the access network of specific channel information received from a service user. That is, as shown, when the service user terminal transmits a message (Program Select Request) for the broadcast channel selection request to the access network (S305), the access network transmits the downloading result for the video stream of the broadcast channel Thereafter, a program transfer response message (Program Select Response) is provided to the service user terminal (S306).

A broadcast channel control method in an access network according to the present invention including such a feature is as follows. 4 to 7 are flowcharts illustrating an operation process of an OLT and an ONU, which are broadcast channel control methods in an access network according to the present invention. First, FIG. 4 is a flowchart illustrating an initialization process of an ONU.

Before the initialization process, the ONU resets all counters (S401), and then generates a configuration information request message and transmits it to the OLT (S402). After the transmission, the timer T _cir is started in order to prevent the standby state indefinitely (S403). Thereafter, if a configuration information response message is received from the OLT before the timer expires (S404), the ONU stops the timer (S405) and then generates static information using the received configuration information response message (S406). Thereafter, the ONU analyzes the program transmission request message received from the service user terminal to search whether the broadcast channel desired by the service user is downloaded.

On the other hand, if the timer expires before the corresponding message is received, it is searched whether the expiration number of the timer exceeds the maximum repetition allowance value (S408). As a result of the search, if the expiration number of the timer does not exceed the maximum repetition allowance value, the temporary counter T _cir 1 is increased (S409), and then a configuration information request message is generated again (S402), while the timer When the number of expiration exceeds the maximum repetition allowable value, after notifying the abnormal situation to the operation management module (S410), the ONU analyzes the program transmission request message received from the service user terminal, and the broadcast channel desired by the service user is determined. Check if it is downloaded. That is, the process of FIG. 6 is connected.

5 is a flowchart illustrating an initialization process of an OLT. The OLT first receives the configuration information request message from the ONU (S510), and then generates a configuration information response message by referring to the received configuration information request message and corresponding static information (broadcast channel and broadcast channel-specific access information) (S520). (S530). The generated configuration information response message is transmitted to the ONU (S540). After that, the OLT analyzes which message is the program transmission request message received from the ONU. That is, the process of FIG. 7 is connected.

6 is a flowchart illustrating a service providing process of an ONU. When the program transmission request message is received from the service user terminal (S601), the ONU stores the corresponding dynamic information in the contents of the received message (S602), and then searches whether the program identifier is a non-program (S603). . As a result of the search, if the program identifier is not a non-program, the channel data of the program identifier is checked (S604). Thereafter, after searching whether the corresponding channel data exists (S605), if the corresponding channel data exists, a program selection response message is generated and transmitted (S606), whereas if the corresponding channel data does not exist, the program selection request is performed. After generating and transmitting the message (S607), the timer is started (S608). On the other hand, if the search result, the program identifier is a non-program, if the program identifier is confirmed (S613), and if the check result, a suspended state, generates a program request message, and transmits directly to the OLT (S614).

Subsequently, if a program transmission response message is received from the service user terminal before the timer expires (S609), the timer is stopped (S610), and then a program transmission response message is generated and transmitted again to the service user terminal (S606). However, if the timer expires before the program transfer response message arrives from the service user terminal (S611), a program transfer response message of failure is generated and immediately transmitted to the service user terminal (S612).

7 is a flowchart illustrating a service providing process of an OLT. When the OLT receives a program selection request message from the ONU (S710), after downloading the corresponding program to the ONU (S720), the OLT generates a program selection response message and transmits the generated program selection response message to the ONU (S730). On the other hand, if a program request message is received from the ONU (S740), the transmission of the program is immediately stopped (S750).

8A to 8D are diagrams of encoding formats of messages used in the broadcast channel control method in an access network according to an embodiment of the present invention as described above, which is an encoding scheme according to the prior art. First, FIG. 8A is an encoding format diagram of a configuration information request message, FIG. 8B is an encoding format diagram of a configuration information response message, FIG. 8C is an encoding format diagram of a program transmission request message, and FIG. 8D is an encoding format diagram of a program transmission response message. to be.

While the invention has been described above based on the preferred embodiments thereof, these embodiments are intended to illustrate rather than limit the invention. It will be apparent to those skilled in the art that various changes, modifications, or adjustments to the above embodiments can be made without departing from the spirit of the invention. Therefore, the protection scope of the present invention will be limited only by the appended claims, and it will be possible to interpret it as including all the above-described changes, modifications or adjustments.

As described above, according to the present invention, the broadcast channel accessed by the current service user is downloaded by ONU and the broadcast channel not accessed by the current service user is terminated in the OLT, so that the limited bandwidth can be effectively used and the related signal message Has the effect of preventing the concentration of OLT.

Claims (7)

In the broadcast channel control method in the access network consisting of OLT and ONU to provide the corresponding service of the OLT and ONU to the service user terminal, A first step of initializing the ONU according to a configuration information request message received from the service user terminal; Initiating the OLT according to the configuration information request message requested from the ONU; A third step in which the ONU receives the corresponding service requested by the service user terminal from the OLT and provides the service to the service user terminal; The OLT includes a fourth step of providing a corresponding service requested by the ONU. The method of claim 1, The first step is, A first sub-step of starting a timer to prevent waiting indefinitely after an ONU generates the configuration information request message and transmits the configuration information request message to the OLT; A sub-step of generating a static information after stopping the timer when a configuration information response message is received from the OLT before expiration of the timer; A third sub step of regenerating the configuration information request message and transmitting the configuration information request message to the OLT if the timer expires before the configuration information response message from the OLT arrives; A fourth sub step of repeating the first to third sub steps; And a fifth substep of stopping the process of the fourth substep if the expiration number of the timer exceeds the maximum repetition allowance value when the fourth substep is executed. Control method. The method of claim 2, The static information is a broadcast channel control method in an access network, characterized in that it comprises a broadcast channel and access information for each broadcast channel. The method of claim 1, The second step, A first sub step of retrieving corresponding information according to the configuration information request message received from the ONU; And a second sub-step of generating a configuration information response message and transmitting the configuration information response message to the ONU after transmitting the retrieved corresponding information. The method of claim 1, The third step, A first sub step of checking whether the corresponding program requested from the subscriber station is being transmitted from the OLT and providing the received program to the service user terminal; A second sub step of transmitting a program transfer request message to the OLT if the program is not being transmitted from the OLT; A third sub step of transmitting a negative program transfer response message to the service user terminal when the timer expires; And a fourth substep of transmitting a message of content of discontinuing transmission of the program to the OLT when a message of content not desired for further viewing is received from the service user terminal. Channel control method. The method of claim 1, The fourth step, A first sub step of providing a corresponding program according to a program transmission request message received from the ONU; And a second sub-step of stopping transmission of the corresponding program according to the received program stop request message from the ONU. Claims [1] A recording medium comprising an OLT and an ONU, and storing a program that can be executed by a computer to perform a broadcast channel control method in an access network that provides a corresponding service of the OLT and an ONU to a service user terminal. A first step of initializing the ONU according to a configuration information request message received from the service user terminal; Initiating the OLT according to the configuration information request message requested from the ONU; A third step in which the ONU receives the corresponding service requested by the service user terminal from the OLT and provides the service to the service user terminal; And the OLT comprises a fourth step of providing the service requested by the ONU.