KR0174944B1 - How to cancel erased resources in DMC protocol - Google Patents

Abstract

The present invention relates to a method for canceling a erased resource initiated by a server in a DSM-CC protocol, comprising: providing a server deleted resource cancel request message from the server to a network; When a server clear resource cancel request message is received from the server, forwarding a client clear resource cancel request message to the client in the network; In response to the client erased resource cancellation instruction message from the network, if the client can cancel the erased resource, canceling the erased resource of the client, and transmitting a client erased resource cancellation response message indicating the cancellation to the network. step; And upon receiving the client erased resource cancellation response message from the network, canceling the erased resource of the network and delivering a server erased resource cancellation confirmation message indicating the cancellation to the server. Therefore, there is no command for canceling the erased resource initiated by the server, thereby compensating for the disadvantage of greatly reducing the time and resource utilization between the server, the network, and the client.

Description

How to cancel the erased resource in the DSM-CC protocol

1 is a diagram illustrating a regular procedure for executing a server-initiated erase resource request under the DSM-CC protocol.

2 is an apparatus diagram between a sub, a network and a client to which the present invention is applied.

3 is a flowchart illustrating a method of canceling deleted resources in the DSM-CC protocol according to the present invention.

* Explanation of symbols for main parts of the drawings

100: server 102: storage

104: MPEG2 stream control unit 106: application program control unit

108: command control unit 110: cancel command processor

112: network interface 200: network

202: session control unit 204: cancel command processor

206: resource control unit 300: client

302 network interface 304 MPEG2 transport

306: MPEG2 decoder 308: graphics control unit

310: system control unit 312: cancel command processor

The present invention relates to command processing between a server, a network, and a client in an interactive CATV, and in particular, digital storage media command and control (hereinafter abbreviated as DSM-CC). The present invention relates to a method for canceling a deleted resource in the DSM-CC protocol for canceling a deleted resource initiated by a server under the DSM-CC protocol.

Many digital storage media have different defined control commands. Thus, a user must know a set of differently defined digital storage media control commands in order to access MPEG bitstreams from other digital storage media.

The DSM-CC standard proposed by ISO to address these shortcomings is based on the ISO / IEC 11172 (MPEG-1) bitstream and ISO / IEC stored in the media, regardless of what digital storage media is used in the near or far-area. 13818 (MPEG-2) A set of protocols that define common operations and control functions for managing bitstreams.

On the other hand, to support a variety of applications such as video-on-demand (VOD), interactive video services, or video networks that respond instantly to demand in stand-alone and diverse network environments. Currently, DSM-CC has drafted an extension of the DSM-CC protocol (ISO / IEC 13818-6) in addition to the management of existing MPEG streams.

FIG. 1 is a diagram for explaining a regular procedure in which a command sequence proceeds when a server-initiated erase resource is requested under the conventional DSM-CC protocol.

In the first step, the server sends a Server Delete Resource Request message to the network.

In the second step, upon receiving a Server Delete Resource Request message from the server, the network examines whether the value of the session-ID matches an existing session and whether the session belongs to the server. As a result of the search, if the field value of the session-ID is valid and is owned by the server, the network sends a Client Delete Resource Indication message to the client. If the field value of the session-ID is the same as the session-ID received from the server, the value of the listen field indicates that the session is deleted by the server's request, and the user data counter and the user data byte field are used. The value of is the same as that received from the server.

In step 3, upon receiving the client clear resource indication message, the client side checks whether the value of the session-ID matches an existing session. As a result of the search, if the value of the session-ID field is valid, the client first releases all resources allocated to the session and sends a Client Delete Resource Respone message to the network. The value of the session-ID field is the same as the value of the session-ID field received from the network, and the value of the userDataCount field is equal to the number of user data bytes in the message. That is, from this point on, the client assumes that the session has ended and all session resources have been released.

In the fourth step, the network releases all client resources allocated to the session as soon as the Client Delete Resource Respone message is received, and then sends a Client Delete Resource Confirm message to the server. The values of the fields Session-ID, User Data Count, and User Data Byte are the same as those received from the Client Delete Resource Respone. Terminate and assume all session resources are released.

In a fifth step, as soon as the server receives a Client Delete Resource Confirm message, the server releases all resources allocated to the session. From this point on, the server terminates the session and releases all session resources.

The related information of the command is briefly described as follows.

Server Clear Resource Request: Session-ID, Reason, ReasonCount, ResourceCount, ResourceNum, User Data Count, User Data Byte.

Client Clear Resource Instruction: Session-ID, Reason, Resource Count, ResourceNum, User Data Count, User Data Byte.

Client Erase Resource Response: Session-ID, response, user data count, user data byte.

Server Erase Resource Check: Session-ID, Response, User Data Count, User Data Byte.

As described above, the interactive CATV is a series of command sequences for processing one erased resource between a client, a network, and a server, namely, a server erased resource request, a client erased resource instruction, a client erased resource response, and a server erased resource check. Further commands are sent and received between three subjects: client, network and server.

However, in some cases, the requester of the resource request for the first time may need to change the resource command for cancellation of the user or change of the network environment before receiving the confirmation command. In this case, since there is no command for processing the DSM-CC protocol of the prior art, the exchange of a new command can be performed only after a series of command negotiations are completed. More specifically, once a cleared resource command has been cancelled, a new cleared resource cancel command must be provided after receiving a confirmation command for the deleted resource. As a result, the erased resource cancellation method of the conventional DSM-CC protocol has a disadvantage in that the utilization of time and resources is greatly reduced by repeatedly performing two command exchanges.

Accordingly, the present invention has been made to solve the above disadvantages, an object of the present invention is to delete the erased resources in the DSM-CC protocol to easily cancel the erased resources initiated by the server To provide.

According to the present invention for achieving the above object, a first step of providing a server erase resource cancellation request message from the server to the network to cancel the erase resource; When the server clear resource cancel request message is received from the server, transmitting a client clear resource cancel request message to the client in the network; A third step of determining whether the client can cancel the erased resource in response to the client erased resource cancellation instruction message from the client; If cancellation of the erased resource is not possible at the client, a first client erased resource cancellation response message indicating that the erased resource of the client has not been canceled is transmitted to the network, and if the canceled resource at the client is possible, Canceling the erased resource of the client and transmitting a second client erased resource cancellation response message indicating that the erased resource of the client has been canceled to the network; Upon receiving the first client erased resource cancellation response message in the network, a first server erased resource cancellation confirmation message indicating that the erased resource of the client is not canceled is transmitted to the server, and the second server in the network is transmitted. A fifth step of canceling the erased resource of the network and delivering a second server erased resource cancellation confirmation message indicating that the erased resource of the network has been canceled upon receiving the client erased resource cancellation response message of the client; It is characterized by.

Hereinafter, the present invention will be described in detail with reference to the illustrated drawings.

2 is a block diagram schematically illustrating a configuration between a server, a network, and a client suitable for performing a method for canceling a session erase resource in the DSM-CC protocol according to the present invention. The server 100, the network 200, It is composed of a client (300).

The server 100 controls the storage unit 102 for recording image data, data information, and the like, and the MPEG2 stream control unit for standardizing and controlling the data in the form of an MPEG2 bit stream when restoring the data stored in the storage unit 102. An application program control unit 106 for recording an application program of the server apparatus 100 and then resourceing the program based on the application program, a command related to the DSM-CC protocol, and a command control unit 108 for executing the command. ), A cancellation command processor 110 and a network interface 112 for interfacing with the network 200 to be applied to the present invention.

The network 200 includes a session controller 202 for controlling a connection between the network interface 112 of the server and the network interface 301 of the client, a cancellation command processor 204 and program logic and data information to be applied to the present invention. It consists of a resource control unit 206 for volunteering.

The client 300 is connected to the network interface 302, the MPEG2 transport 304, the MPEG2 decoder 306, the graphics control unit 308, the system control unit 310, the cancel command processor 312 and the memory 314. It is composed.

The network interface 302 is connected to a network to perform an interface required for data transmission and reception between the client side and the network device 200.

The MPEG2 transport 304 analyzes the information bits of the transmitted and received data and converts them to meet the MPEG2 standard.

The MPEG2 decoder 306 decodes the data input from the MPEG2 transport 304 and provides the decoded data to the graphic control unit 308.

The graphic controller 308 graphics the data decoded by the MPEG2 decoder 306 and outputs the graphic to the display device.

The system controller 310 controls the system initialization and the switching to the driving state and the overall operation of the system that occur when the power is applied or rebooted (Re-Booting).

The cancel command processor 312 is configured to control the cancel command to be applied to the present invention, and the memory 314 stores decoded data from the MPEG2 decoder 306 or stores information and other data about.

The operation of the present invention configured as described above will be described in detail with reference to FIG.

When the server 100 requesting the Delete Resource command for the first time needs to change the Delete Resource command due to the cancellation of a user or the change of the network environment before receiving the confirmation command, the server Delete Resource Cancel request signal is sent to the server. When applied to the command control unit 108 of 100, the command control unit 108 receives data for the server resource removal request signal accordingly from the cancellation command processor 110 to transmit a network (through the network interface 112). 200) (step 301). At this time, the server erase resource cancellation request includes a session-ID, a reason (reason), a user data counter, and a user data byte.

Accordingly, the network 200 transmits the server erase resource cancellation request message transmitted through the network interface 112 of the server 100 to the session controller 202. The session controller 202 compares whether or not the server erase resource cancel request signal, which is already set in the cancel command processor 204, matches (step 402).

In step 402, the server erase resource cancellation request signal coincides with the client erase resource cancellation signal from the resource control unit 206 of the network 200, and the session controller 202 receives the client erase resource cancellation instruction message therefrom. And to the client 300 via the network interface 302 (step 404).

In step 405, the system control unit 310 of the client 300 determines whether the message provided from the network 200 is a client erase resource cancel indication message, and if it is determined that the message is a client erase resource cancel indication message, step 407. The system controller 310 determines whether cancellation of the erased resource of the client 300 is possible.

If the result of the determination in step 407 is that the erased resource of the client 300 is not cancelable, the flow proceeds to step 408 where the first client erased resource response responds that the erased resource of the client 300 has not been cancelled. The message is sent to the network 200.

However, in step 407, if the erased resource of the client 300 is cancelable, the process proceeds to step 409 to cancel the erased resource of the client 300 and informs that the erased resource of the client 100 is canceled. The client erase resource cancellation response message of 2 is transmitted to the session controller 202 of the network 200 through the network interface 302 of the client 300.

In the above-described steps 408 and 409, the first or second client erased resource cancel response message, that is, distinguishing that the erased resource of the client 300 has not been canceled or canceled is the message response field of the DSM-CC. Provided on board.

In step 410, the network 200 determines whether a first or second client erase resource cancel response message has been sent from the client 300, and if so, in step 412 the message is first received. Or a second client clear resource cancel response message.

In step 412, if the network 200 receives the first client erased resource cancellation response message from the client 300, the flow proceeds to step 413, where the erased resource requested by the server in the client 300 is canceled. The first server erase resource cancellation confirmation message notifying the server 100 is transmitted.

However, in step 412, if the network 200 receives the second client cleared resource cancel response message from the client 300, the flow proceeds to step 414 to cancel the cleared resource of the network 200, This is terminated by providing the server 100 with a second server erase resource cancellation confirmation message indicating that the erased resource of 200 is cancelled.

In the above-described steps 413 and 414, the division of the first or second server erased resource cancellation confirmation message, that is, the determination that the erased resource of the network 200 is not canceled or canceled is the message response field of the DSM-CC. Provided on board.

In addition, the above-described message related to canceling session session according to the present invention is configured using a user defined message scenario code (user defined message scenario code) assigned to the message scenario field (message scenario field) of the DSM-CC, the assigned message Code ID is shown in the following table.

As described above, the present invention does not have a command for executing a server erased resource initiated by a server in the existing DSM-CC, and has an effect of compensating for the disadvantage of greatly reducing the time and resource utilization between the server, the network, and the client. have.

Claims (1)

A method for canceling a erased resource transmitted from a server to a client through a network under a digital storage media command and control (hereinafter, abbreviated as DSM-CC) protocol, to cancel the erased resource, Providing a server erase resource cancellation request message from the server to a network; When the server clear resource cancel request message is received from the server, transmitting a client clear resource cancel request message to the client in the network; A third step of determining whether the client can cancel the erased resource in response to the client erased resource cancellation instruction message from the client; If cancellation of the erased resource is not possible at the client, a first client erased resource cancellation response message indicating that the erased resource of the client has not been canceled is transmitted to the network, and if the canceled resource at the client is possible, Canceling the erased resource of the client and transmitting a second client erased resource cancellation response message indicating that the erased resource of the client has been canceled to the network; Upon receiving the first client erased resource cancellation response message in the network, a first server erased resource cancellation confirmation message indicating that the erased resource of the client is not canceled is transmitted to the server, and the second server in the network is transmitted. A fifth step of canceling the erased resource of the network and delivering a second server erased resource cancellation confirmation message indicating that the erased resource of the network has been canceled upon receiving the client erased resource cancellation response message of the client; Server deletion resource cancellation method in the DSM-CC protocol, characterized in that.