KR101319895B1 - A method for sending and receiving data and broadcasting receiver - Google Patents

Abstract

According to the present invention, a cable card transmits a new flow request message (new_flow_req ()) for connecting a data transmission / reception path for UDP communication to a host, and the host receiving the new flow request message (new_flow_req ()) sends a new message to the cable card. And transmitting a flow response message (new_flow_cnf ()), wherein the new flow request message (new_flow_req) includes an error message control field defining a method of processing an error message received during UDP communication. Provides a method for transmitting and receiving.

Therefore, according to the present invention, it is possible to clarify the operation of the host and the cable card by defining a method of processing an error message received during UDP communication by connecting the data path of the host and the cable card.

Description

A method for sending and receiving data and broadcasting receiver

1 is a flow chart of data transmission and reception between a host and a cable card according to the present invention.

2 is a syntax of a new flow request message including an error message control field according to the present invention.

FIG. 3 is an embodiment diagram of an error message control field included in FIG. 2.

4 is a flowchart of an embodiment of a data transmission / reception method according to the present invention.

5 is a characteristic diagram of processing an error message received by the host;

6 is a flowchart of a method of processing in response to an error message received by the host;

7 is a characteristic diagram of processing an error message received by the host;

8 is a flowchart of a method for ignoring an error message received by a host.

9 is a configuration diagram of an embodiment of a broadcast receiver according to the present invention;

BRIEF DESCRIPTION OF THE DRAWINGS

900 host 902 tuner

904: Demultiplexer 906: Audio Decoder

908: Video Decoder 99: Audio / Video Display

912: Additional Information Processing Unit 914: CAS Module

916: card interface unit 918: key input unit

920: storage unit 930: control unit

940: cable communication unit 950: security module

951: card control unit

The present invention relates to a data transmission and reception method and a broadcast reception device, and more particularly, to a data transmission and reception method between a cable card and a host.

An error may occur in an external server or an intermediate router during UDP communication through the socket, and data transmitted from the broadcast reception device may be lost or other data transmission error may occur.

When an error occurs, the broadcast reception device may receive an error message indicating an error occurrence. In this case, the method of processing the error message received by the host is not clear, which is difficult to implement.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to define a method of processing an error message when receiving an error message, thereby clarifying the data transmission and reception process between the host and the cable card. And a broadcast receiving device.

In order to achieve the above object, the present invention provides a method for transmitting a new flow request message (new_flow_req ()) connecting a data transmission path for UDP communication to a host by a cable card, and receiving the new flow request message (new_flow_req ()). The host includes sending a new flow response message (new_flow_cnf ()) to the cable card, wherein the new flow request message (new_flow_req) includes an error message control field defining a method of processing an error message received during UDP communication. It provides a data transmission and reception method comprising a.

According to another embodiment of the present invention, the present invention comprises the steps of a host receiving a new flow request message (new_flow_req ()) including an error message control field defining a method of processing an error message received during UDP communication, the host Connected to a cable card and a socket process, receiving data from the cable card, transmitting the data received from the cable card to an external server, and receiving an error message for the transmitted data, the error message control And processing the received error message by the host according to the value of the field.

According to still another embodiment of the present invention, the present invention provides a cable card, which is a communication path with a broadcast signal transmission entity, a cable communication unit for connecting a broadcast receiver and an external server to perform network communication, and receiving data from the cable card. And a host for transmitting and receiving data by communicating with an external server through the cable communication unit, and the cable card and the host include an error message control field defining a method of processing an error message received during UDP communication. Connected by new_flow_req ()), the host processes the received error message according to the value of the error message control field.

Therefore, according to the present invention, it is possible to clarify the operation of the host and the cable card by defining a method of processing an error message received during UDP communication by connecting the data path of the host and the cable card.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. At this time, the configuration and operation of the present invention shown in the drawings and described by it will be described as at least one embodiment, by which the technical spirit of the present invention and its core configuration and operation is not limited.

In addition, although the term used in the present invention is selected as a general term that is widely used at present, in some cases, there is a term arbitrarily selected by the applicant. In this case, the meaning is described in detail in the description of the present invention. It is to be understood that the present invention should be grasped as a meaning of a term other than a name.

The broadcast reception device includes a cable card, a host, and a cable communication unit.

The cable card serves as a communication path with a broadcast signal transmitting entity, for example, a broadcasting station and a head end. The cable communication unit connects a broadcast receiver and an external server to perform network communication. An example of the cable communication unit is a cable modem.

The host may process the received broadcast signal and output it. In addition, by receiving data from the cable card, it can communicate with an external server through the cable communication unit to transmit and receive data.

The host and cable card need three IP addresses to implement IP communication with the external server. The first IP address required is for the cable modem, the second for the host, and the third for the cable card. Basically, in case of OCAP application, IP communication is performed by opening a socket using the IP address of the host. When IP communication is required from the cable card, the cable card has an IP address for the cable card. IP communication is performed through the interface. However, in the case of the CableCARD interface, the data is transmitted to the host in the form of an IP packet through the interface between the separate host and the cable card. In this case, the host has a disadvantage in that it is complicated in implementation since the host must perform data transmission and reception on behalf of the card identifier. In addition, since three IP addresses are required in one broadcast receiving device, the IP address is wasted.

To compensate for this, the IP address of the cable card is eliminated and IP communication is carried out through the socket with the IP address of the host basically to reduce IP waste and to implement IP communication of the communication card simply and clearly.

The external server and the broadcast reception device perform logical communication. At this time, the types of transport layers that perform logical communication between end-to-end include UDP and TCP.

The TCP is a connection-oriented transport and transmits data in consideration of the state of an external server. That is, a response message for the transmitted data is received to confirm that the data is transmitted normally. If the reception is not successful, the data may be retransmitted.

The UDP is a connectionless transport, and transmits data without considering the state of an external server. In addition, since data is transmitted without considering an error of data transmission, a delay of data transmission does not occur.

 If UDP communication is performed through socket, there may be a problem with the host, a problem with the external server, or an intermediate router connecting the host and the remote server. The UDP packet transmitted by the router may fail to reach the remote host due to an abnormality in the router. Since UDP protocol basically provides the best-effort service, it cannot guarantee reliability. Therefore, there is no guarantee that the datagram sent from the IP layer has reached its destination. If there is a problem with the remote server, the remote server may report the error through an error message to the calling party. When the sender receives an error message, it handles it accordingly. It is up to the implementation method to receive the error message and process the corresponding message or to ignore the error message. This can be implemented in various forms. There is no standard on how to implement, so there are some ambiguities in the implementation of the operation.

1 illustrates a flow of data transmission and reception between a host and a cable card according to the present invention.

Referring to FIG. 1, the cable card transmits a new flow request message (new_flow_req ()) to the host, and the host transmits a new flow response message (new_flow_cnf ()) to the cable card, so that the cable card and the host send data. This will be connected for transmission and reception.

In this case, the new flow request message (new_flow_req) includes an error message control field defining a method of processing an error message received during UDP communication.

The present invention relates to a method of controlling an error message in a host when an error occurs during UDP communication and an error message is received from an external server.

The external server and the broadcast receiving device communicate through a UDP transport layer. At this time, the external server communicates with the cable card through a host in the broadcast receiving device.

In order to send and receive data to and from the external server, the host and the cable card are connected by a socket process. The cable card transmits a new flow request message from the cable card to the host, and the host sends a new flow response message for the new flow request message to the cable card. By transmitting, the connection between the cable card and the host is initiated.

When the cable card starts to connect with the host, the cable card transmits data to the host, and the host transmits the received data to the external server through the cable modem.

The present invention is intended to clearly define the operation of the cable card and the host when an error occurs during UDP communication.

The UDP protocol does not provide reliability by default, so the host that sent the datagram does not guarantee that the datagram has arrived at its destination. However, if a problem occurs in the remote host or in the middle, an error message can be sent to the sender. An example of an error message is an Internet Control Message Protocol (ICMP) message. Hereinafter, description will be given using an ICMP message which is an embodiment of an error message.

At this time, the sender can ignore the received ICMP message because the datagram does not matter whether the data arrives at the destination well or not. However, if you receive an ICMP message, you can also take appropriate action. This is determined by the implementation on the host side. However, there is no clear description of how this is implemented, so implementations may vary for each company's model. Therefore, this paper suggests a way to more clearly define the ambiguity to prevent possible errors.

Figure 2 illustrates the syntax of a new flow request message including an error message control field in accordance with the present invention.

Referring to FIG. 2, a new flow request message is an error message received during UDP communication in a loop containing socket connection information when the service type is a socket process (hereinafter referred to as a 'socket connection information loop'). An error message control field 201 defining the processing method is included.

The new flow request message is sent by the host to the card in the OOB mode and the card to the host in the DSG mode.

The new flow request message is a message requesting the opening of a connection or flow between a host and a card. The new flow request message includes connection information according to a process used in a separate loop.

The common loop includes a new flow request message tag, a field length, and a service type field. Examples of service types include MPEG section, IP unicast, IP multicast, socket, etc. One of these service types is defined in the service type field.

There is a separate loop containing connection information according to the service type. Since the error message control field according to the present invention corresponds to one of the socket connection information, it is included in the socket connection information loop.

 The socket connection information loop includes a protocol tag (protocol_tag) field, a timeout_control field, a local_port_number field, a remote_port_number field, and a connection_timeout field. In addition, it may further include a socket connection information field.

The error message control field 201 defines a method of processing an error message when an error message is received from an external server. Also, the error message processing process depends on the value defined in the error message control field. In this case, the error message control field may define one of ignore or not ignore the error message as a method of processing the error message.

The error message control field 201 may also be defined to report the received error message to the cable card.

The local port number field (local_port_number) identifies a local port.

The remote port number (remote_port_number) field identifies a remote port.

The connection_timeout field defines a state that is timed out. For example, the time determined by the timeout is defined.

FIG. 3 illustrates an embodiment of an error message control field included in FIG. 2.

Referring to FIG. 3, if the value of the error message control field is 0x00, the host ignores the received error message. If the value of the error message control field is 0x01, the host does not ignore the error message. If the value is 0x02, the host can define to report the received error message to the cable card. Such an implementation is merely an embodiment and may be defined to vary an implementation method according to a value of a field.

The extra bits can be left as reserved fields for future use.

When the cable card sends a new flow request message (new_flow_req ()) to the host, 0x00 (host ignores icmp message) or 0x01 (host SHALL not ignore icmp message) or 0x02 (host SHALL report icmp) in the error message control field. message) to send. This is only an embodiment, the scope of the present invention is not limited to this embodiment.

The host receiving the new flow request message (new_flow_req ()) extracts the value of the error message control field (icmp_control field) to determine whether to process or ignore the error message (icmp message) in the host and performs an operation accordingly.

The host may default to process an error message when the value of the error message control field (icmp_control field) in the new flow request message (new_flow_req ()) is not a defined value.

4 is a flowchart of an embodiment of a method of transmitting and receiving data according to the present invention.

Referring to FIG. 4, according to an embodiment of the present invention, a host receives a new flow request message (new_flow_req ()) including an error message control field defining a method of processing an error message received during UDP communication. The host is connected to the cable card and the socket process, receiving data from the cable card, transmitting the data received from the cable card to an external server, and receiving an error message for the transmitted data. And processing, by the host, the received error message according to the value of the error message control field.

Receiving the new flow request message (S41) is a step in which a host requests a new flow from the cable card. The new flow request message includes an error message control field that defines a method of processing an error message received during UDP communication.

The host receiving the new flow request message sends a new flow response message to the cable card. When the cable card receives the new flow response message, the data path of the host and the cable card is connected.

When the data path is connected, the host receives data through an extended channel from the cable card, and transmits the data to an external server (S42). In this case, the data may be received in the form of a packet or datagram.

Data received over the extension channel is routed over the network through the cable modem through an already open socket.

A problem occurs in the external server or the intermediate router, and an error message is sent to the data sender, and the host receives the error message (S43).

The received error message is processed by the method defined in the error message control field included in the new flow request message (S44).

5 shows a characteristic of processing an error message received by the host.

Referring to FIG. 5, in the broadcast receiving device including the cable modem 59, the host 520, and the cable card 530, when the host 520 receives an error message through the cable modem 59, the host may receive an error. Respond to the situation. A detailed method of coping with an error occurrence by the host will be described with reference to FIG. 6.

6 shows a flow of a method of processing, in response to an error message received by the host.

If the error message control field is defined not to ignore the error message received by the host, that is, to handle it accordingly, the port of the server is checked by checking the status of the external server when a UDP socket open request is made. You can check whether you are ready to receive data.

In addition, if a problem occurs in an external server or an intermediate router after transmitting a UDP datagram, the host transmits data when an error message (ICMP message) indicates that there is a problem in UDP packet transmission. Stop and propagate the error to the host's application through the socket interface.

The assignment sends an error occurrence indication message (lost_flow_ind ()) to the cable card (C69) to the cable card (C69) to inform the cable card that the flow has been terminated. In this case, the error occurrence is defined in the reason field (reason_field) of the error occurrence indication message. For example, if the value of the reason field of the error occurrence indication message is 0x06, this may mean that a socket error occurs. In this case, the error occurrence indication message may use the flow identifier to inform the cable card of the flow in which the error occurred. The flow identifier has a flow ID.

The cable card sends an error occurrence response message (lost_flow_cnf ()) to the host (S620) and again sends a flow end request message (delete_flow_req ()) to the host (S630). When the host receives the flow end request message (delete_flow_req ()) from the cable card, the host closes the socket for the flow and then sends a flow end response message (delete_flow_cnf ()) to the cable card (S640). .

Thereafter, the cable card transmits a new flow request message to the host, and when a new data path is connected, new data transmission and reception are possible.

If the error message control field is defined to report the error message received by the host to the cable card, the server's port will receive the data by checking the status of the external server when a UDP socket open request is made. You can check whether

In addition, if a problem occurs in an external server or an intermediate router after transmitting a UDP datagram, and an error message (ICMP message) indicates that there is a problem in UDP packet transmission, Send a warning message and continue sending UDP packets. In this case, a warning message may use an existing error occurrence indication message (lost_flow_ind ()) or a new function. For example, problem_flow_ind (). At this time, the cable card determines whether to ignore the error message or terminate the socket connection. That is, by reporting the error message to the cable card, the cable card determines how to process the error message and controls subsequent steps.

7 shows a characteristic of processing an error message received by the host.

Referring to FIG. 7, in the broadcast reception device including the cable modem 59, the host 520, and the cable card 530, when the host 520 receives an error message through the cable modem 59, the host may receive an error. Ignore the message.

8 shows the flow of a method for ignoring an error message received by a host.

If the error message control field is defined to ignore the error message received by the host, the UDP datagram is transmitted without checking the status of the external server when the UDP socket open request is made. In addition, after transmission, the host does not consider whether the transmitted data has reached its destination and does not notify the cable card separately.

In addition, if an error message (ICMP message) indicates that a problem occurs in the UDP packet transmission due to a problem in the remote host or an intermediate router after the UDP datagram transmission, an error message (ICMP message) Ignore) and continue to transfer data.

9 shows a configuration of an embodiment of a broadcast receiver according to the present invention.

Referring to FIG. 9, the broadcast receiving apparatus according to the present invention receives data from a cable card, which is a communication path with a broadcast signal transmission entity, a cable communication unit for connecting a broadcast receiver and an external server to perform network communication, and the cable card. And a host communicating with an external server through the cable communication unit to transmit and receive data.

At this time, the cable card and the host are connected by a new flow request message (new_flow_req ()) including an error message control field defining a method of processing an error message received during UDP communication, and to a value of the error message control field. Therefore, the host processes the received error message.

The digital broadcast receiver includes a host 900, a cable communication unit 940, and a cable card 950.

The host 900 includes a tuner 902, a demultiplexer 904, an audio decoder 906, a video decoder 908, an audio processor 609, a video processor 99, an additional information processor 912, and a CAS (Conditional). Access System) module 914, a key input unit 918, a card interface unit 916, a storage unit 920, and a control unit 930.

The tuner 902 tunes a broadcast channel selected by a user. When the user changes the viewing channel, the corresponding frequency is selected. The selected frequency enters a VSB or QAM converter (not shown) and is converted into a digital signal.

The demultiplexer 904 demultiplexes the time multiplexed transport stream into demultiplexed, that is, video, audio and side information signals.

The audio decoder 906 expands / restores the audio signal separated by the demultiplexer 904 and outputs the audio signal through the audio display unit 99, and the video decoder 908 decompresses the video signal separated by the demultiplexer 904. / Restore and output via the video display unit (99).

The CAS module 914 extracts an Entitlement Control Message (ECM) PID and a Local Transport Stream ID (LTSID) from the information analyzed by the additional information processor 912.

A command desired by a user is input to the key input unit 918, and the controller 930 controls the operation of each unit of the digital broadcasting system.

The control unit 930 is also responsible for the copy restriction process that is responsible for the limited reception function between the cable card 950 and the host 900. The controller 930 classifies the received digital broadcast signal into a main stream and an extra stream, determines whether to scramble, and descrambles the scrambled stream.

It also controls the socket process between the host and the cable card according to the present invention. That is, a new flow request message received from the cable card is received and the value of the error message control field is analyzed. When an error message for data transmission is received, the error processing is controlled according to the value of the error message control field. The above-described socket process may be applied to the controller.

The storage unit 920 stores and extracts necessary information according to the control signal of the controller 930. In the present invention, the information on the stream in which the scramble is determined is stored by the control signal of the controller.

The cable card 950 is inserted into the card interface unit 222. The card interface unit may be located in the host, may be located in the cable card 950, may be present together. According to the present invention, when the control unit exchanges a message with a cable card or exchanges data, the control unit is a passage for communication.

The cable communication unit 940 is in charge of network communication. In the present invention, the cable communication unit may be connected to an external server to exchange messages. An embodiment of the cable communication unit is a cable modem.

The cable card 950 serves as a communication path with the broadcast signal transmitter. In addition, a control unit 951 is provided in the cable card.

When the controller 951 in the cable card defines to report the error message to the cable card in the error message control field, if the host reports the error message to the cable card, it determines the next step. In other words, the cable card becomes the subject for error handling.

In this embodiment, however, a descrambling module is provided in the cable card, and the cable card is attached to and detached from the host. The broadcast signal from the broadcast station is descrambled through a descrambling module of the cable card and provided to the user. However, according to an embodiment, a descrambling module is provided inside the host without a cable card, and the descrambling module may be configured to be downloaded from a broadcasting station. That is, a descrambling module downloaded from a broadcasting station or the like may have a different configuration to be stored in a predetermined memory in the host.

As an example of the method for downloading the descrambling module, when a security processor pre-embedded in the set-top is connected to the network, the CA may automatically download a CA (Conditional Access) image from the headend. However, it is natural that the difference in configuration does not change the scope of the present invention.

The above description is merely illustrative of the technical idea of the present invention, and those skilled in the art to which the present invention pertains may make various modifications and changes without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention but to describe the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas falling within the scope of the same shall be construed as falling within the scope of the present invention.

The effects of the data transmission and reception method and the broadcast reception device according to the present invention described above are as follows.

According to the present invention, it is possible to clarify the operation of the host and the cable card by defining a method of processing an error message received during UDP communication and connecting the data path of the host and the cable card.

Claims (11)

Sending, by the cable card, a flow request message for connecting a data transmission / reception path for UDP communication to a host; Sending the flow response message to the cable card by the host receiving the flow request message, The flow request message includes an error message control field for defining a method of processing an error message received during UDP communication. The method of claim 1, The error message control field is defined to implement one of the error message (ignore) or not (ignore) for the data received by the host. The method of claim 1, The error message control field is defined to implement to report an error message for the data received by the host to the cable card. Receiving, by the host, a flow request message including an error message control field defining a method of processing an error message received during UDP communication; The host is connected to a cable card and a socket process to receive data from the cable card; Transmitting data received from the cable card to an external server and receiving an error message for the transmitted data; And processing, by the host, the received error message according to a value of the error message control field. 5. The method of claim 4, If the error message control field defines a processing method to ignore the received error message, And the host ignores the received error message according to a value of the error message control field. 5. The method of claim 4, When the error message control field defines a processing method corresponding to the received error message, The host sending an error occurrence indication message of data to the cable card according to a value of the error message control field; The cable card stopping data transmission to the host and transmitting a flow end request message to the host; The host further comprises the step of terminating the socket process. The method according to claim 6, The occurrence of the error is a method of transmitting and receiving data, characterized in that defined in the reason (reson field) of the error occurrence indication message. 5. The method of claim 4, If the error message control field defines a processing method to report the received error message to the cable card, The host reporting an error occurrence of data to the cable card according to the value of the error message control field; The cable card further comprises the step of determining whether to proceed with the data transmission, and notifying the host characterized in that the data transmission and reception method. A cable card, which is a communication path with a broadcast signal transmitter; A cable communication unit for connecting a broadcast receiver and an external server to perform network communication; And A host for receiving data from the cable card and communicating with an external server through the cable communication unit to transmit and receive data; The cable card and the host are connected by a flow request message including an error message control field defining a method of processing an error message received during UDP communication, and the error received by the host according to the value of the error message control field. A broadcast receiving device characterized by processing a message. 10. The method of claim 9, The error message control field is defined to implement one of the error message (ignore) or not (ignore) for the data received by the host. 10. The method of claim 9, The error message control field is defined to implement to report an error message for the data received by the host to the cable card.

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