KR100598074B1 - Method of transmitting broadcast streaming data in ip based broadcasting service system - Google Patents

Abstract

The present invention relates to a method for transmitting broadcast stream data in an IP-based broadcast service system for multicasting broadcast stream data only for authenticated subscribers and subscriber-authorized channels.

The present invention as described above comprises a tenth step (S10) in which the broadcast server (11, 12) multicasts a plurality of broadcast stream data to the L3 switch 40; When the terminal 60 is powered on, performing a user authentication process and then assigning an IP address (S20); A thirtieth step (S30) of establishing a subscriber profile information database on the L2 and L3 switches 50 and 40; A 40th step in which the broadcast server 11 or 12 transmits TV portal information to the corresponding terminal 60 (S40); When a desired channel is selected, the terminal 60 performs a group join request (S50); And if the L3 switch 40 is an authenticated user and channel, the 60th step (S60) of joining the group and transmitting the broadcast stream data.

According to the present invention, paying and differentiating a broadcasting service is achieved, and an efficient network management is achieved by reducing bandwidth of the entire network.

Broadcasting service system, IGMP protocol, PIM-SM protocol, broadcasting server,

Description

Broadcast stream data transmission method in IP-based broadcast service system {METHOD OF TRANSMITTING BROADCAST STREAMING DATA IN IP BASED BROADCASTING SERVICE SYSTEM}             

1 is a network diagram of an IP-based broadcast service system to which the present invention is applied;

2 is an operation flowchart illustrating a broadcast stream data transmission process in an IP-based broadcast service system according to an embodiment of the present invention;

3 is an exemplary diagram illustrating a structure of an IGMP message in the broadcast stream data transmission method according to FIG. 2;

4 is a diagram illustrating a structure of a broadcast channel and a multicasting address mapping table in the broadcast stream data transmission method according to FIG. 2;

FIG. 5 is an exemplary diagram illustrating a broadcast channel mapping table that can be viewed for each subscriber in the broadcast stream data transmission method according to FIG. 2.

<Explanation of symbols for the main parts of the drawings>

11, 12: broadcast server 20: authentication server

21: DHCP server 30: Multicasting Router

40: L3 switch 41: IGMP server

50: L2 switch 60: terminal (set-top box or PC)

The present invention relates to a method for transmitting broadcast stream data in an IP (Internet Protocol) -based broadcast service system. More particularly, the present invention relates to a method of authenticating a subscriber and a channel when a user accesses a service. The present invention relates to a method for transmitting broadcast stream data in an IP-based broadcast service system that multicasts broadcast stream data only for subscribers and subscriber-authorized channels.

As is well known, the speed of internet provided to subscribers is getting faster due to the generalization of the use of Internet and the rapid development of technology. The rapid development of the Internet has a profound effect on the field of broadcasting services, and the transition from the existing cable service method to the cable service providing method through the Internet is being radically performed, and active research is being conducted.

At this time, the conventionally developed broadcasting service using the Internet uses the unicast method, which is a point-to-point connection method, which causes a large rental width by copying and transmitting broadcast stream data whenever a user requests a connection. There was a problem that a lot of load on the network itself.

For this reason, the multicast scheme was developed to overcome the above-mentioned problems of the unicast scheme, which is a broadcast service scheme using a protocol capable of simultaneously delivering one broadcast stream data to multiple user terminals belonging to the same group. . However, since the existing protocol for multicasting group management does not have any authentication process for subscribers, there are no constraints on user's joining and leaving the group. There was a problem that the quality of service is poor because it is impossible.

In addition, as described above, since the existing protocol for multicasting group management has no authentication process, the broadcast stream data is transmitted whenever the user requests a connection, thereby increasing the load of the broadcast service network. Because of this, there was a problem that efficient network management is impossible.

Accordingly, the present invention has been made to solve the above-mentioned conventional problems, and an object of the present invention is to perform authentication procedures for subscribers and channels when users access a service, and only authenticated subscribers and subscriber-specific authenticated channels. By multicasting the broadcast stream data, not only the paying and differentiation of the broadcast service is realized but also a method of transmitting the broadcast stream data in an IP-based broadcast service system for reducing the bandwidth of the entire network.

In order to achieve the above object, a broadcast stream data transmission method in an IP-based broadcast service system of the present invention includes a broadcast server, an authentication server provided with a DHCP server, a multicasting router connected to the authentication server through the Internet, and the multi A method of transmitting broadcast stream data in an IP based broadcast service system including an L3 switch connected to a casting router, an L3 switch provided with an IGMP server, an L2 switch connected to the L3 switch, and a terminal (set-top box or PC) connected to the L2 switch. To

A tenth step of the broadcasting server multicasting a plurality of broadcast stream data to the L3 switch;

A twenty step of, when the power of the terminal is turned on, the authentication server performs an authentication procedure for a user of the terminal, and the DHCP assigns an IP to the terminal;

A thirtieth step, wherein the authentication server establishes a subscriber profile information database on the L2 switch and the L3 switch;

Step 40, by the broadcasting server, transmitting software and TV portal information (EPG, channel selection guide information) necessary for the terminal to the corresponding terminal;

If the user selects a desired channel through the terminal, the terminal transmitting a membership report message (IGMP join) to the IGMP server of the L3 switch via the L2 switch; And

After receiving the membership report message (IGMP join) from the L3 switch, the L3 switch searches profile information of the corresponding subscriber, and if the user and channel are authenticated, joins a group to establish a group information table of a multicast session and then subscribes to the subscriber. And a sixty step of transmitting broadcast stream data to the terminal.

Hereinafter, a broadcast stream data transmission method in an IP based broadcast service system according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a network configuration diagram of an IP-based broadcast service system to which the present invention is applied. The IP-based broadcast service system according to the present invention includes a broadcast server (11, 12) and a DHCP (Dynamic Host Configuration Protocol) server 21. L3 provided with an authentication server 20, a multicasting router 30 connected to the authentication server 20 through the Internet, and an IGMP server 41 connected to the multicasting router 30. The switch 40, the L2 switch 50 connected with the L3 switch 40, and the terminal (set top box or PC) 60 connected with the L2 switch 50 are comprised.

At this time, the broadcast server may be located in the local 11 connected to the L2 switch 50 as shown in FIG. 1, or may exist in the core network 12, where multicasting is performed on the core network. In order to achieve this, the protocol independent multicast-sparse mode (PIM-SM) protocol function must be implemented in the network, and if it is located locally, the IGMP protocol must be implemented.

In addition, as shown in FIG. 1, when there is L2 switch 50 equipment between the terminal 60 and the L3 switch 40, an IGMP snooping function should be implemented in the L2 switch 50. In this IGMP snooping function, when the terminal 60 selects a desired channel as an IGMP client, it requests to join a multicast group member. In the L3 switch 40, a group of multicast sessions is selected. By constructing the information table, the broadcast stream data transmitted from the broadcast servers 11 and 12 is transmitted to the terminal 60.

Next, a broadcast stream data transmission method in an IP-based broadcast service system according to an embodiment of the present invention configured as described above will be described with reference to the accompanying drawings. 2 is a flowchart illustrating a process of transmitting broadcast stream data in an IP-based broadcast service system according to an embodiment of the present invention.

First, the broadcast servers 11 and 12 encode a plurality of broadcast stream data (for example, encoding using MPEG2 or MPEG4) as a network initialization process, and then attach a multicast IP for each channel to the L3 switch 40. Multicasting to (S10). At this time, the L3 switch 40 discards all packets if there is no terminal 60 subscribed to the multicast group after receiving a plurality of broadcast stream data from the broadcast servers 11 and 12 (S11).

Thereafter, as the set-top initialization process, when the power of the terminal 60 is turned on, an authentication procedure for the user of the terminal 60 is performed through communication between the terminal 60 and the authentication server 20, The DHCP server 21 allocates an IP to the terminal 60 (S20).

Then, the authentication server 20 builds a subscriber profile information database on the L2 switch 50 and the L3 switch 40 (S30). In this case, FIG. 5 is an embodiment illustrating profile information about a channel that can be viewed for each subscriber.

Then, the broadcast servers 11 and 12 transmit the software and TV portal information (EPG (Electronic Program Guide), channel selection guide information) required for the terminal 60 to the corresponding terminal 60 (S40). At this time, in the channel selection guide information of the TV portal information, IP address and MAC (Media Access Control) address information mapped to each channel is recorded as shown in FIG. 4. 4 is a diagram illustrating an embodiment of a table in which multicast IP addresses are mapped to broadcast channels, and a KBS broadcast is designated as a relative "number 1", and a multicast IP address thereof is set as "224.10.8.1". Specify the MAC address as "01: 00: 5e: 0a: 08: 01". Therefore, this address information should be known to the terminal 60, and when viewing the KBS broadcasts should send a membership report message (IGMP join) to the address "224.10.8.1".

At this time, if the user selects a desired channel through the terminal 60, the terminal 60 receives a membership report message (IGMP join) via the L2 switch 50, the IGMP server of the L3 switch 40 ( 41) (S50). The membership report message (IGMP join) 1 includes an IGMP type field 1a for storing version and type information of an IGMP message, as shown in FIG. 3; A maximum response time field 1b in which maximum response time information is stored; A checksum field 1c; It consists of a Multicast Group address field (1d), which is filled with "0" in case of general query message and a specific group address is stored in case of group-specific query message. Here, the maximum response time field 1b is specified only in the case of a membership query message.

On the other hand, the L3 switch 40 receives the membership report message (IGMP join) from the terminal 60, retrieves the profile information of the subscriber and joins the group if the authenticated user and channel, the group of the multicast session After constructing the information table, the broadcast stream data is transmitted to the subscriber station 60 (S60).

At this time, the method of the L3 switch 40 to search whether the user and the channel is authenticated in more detail with reference to Figures 4 and 5, the terminal 60 IP address corresponding to KBS broadcast If the membership report message (IGMP join) is sent to (224.10.8.1), the L3 switch 40 is mapped to the MAC address "01: 00: 5e: 0a: 08: 01" of the IP address "224.10.8.1". Retrieve channel information. At this time, "Channel No. 1", which is the KBS broadcast of FIG. 4, indicates the right to view since the first bit of the channel mapping table of FIG. Therefore, through this process, the L3 switch 40 proceeds with the authentication search procedure of the user and the channel.

Meanwhile, when the terminal 60 transmits a membership rib group message (IGMP leave) to the L3 switch 40 via the L2 switch 50, the L3 switch 40 stops transmitting the broadcast stream data ( S70). The membership leave message (IGMP leave) also has a structure as shown in FIG. 3 like the membership report message (IGMP join) 1.

Although the present invention has been described in more detail with reference to some embodiments, the present invention is not necessarily limited to these embodiments, and various modifications can be made without departing from the spirit of the present invention.

As described above, according to the method for transmitting broadcast stream data in the IP-based broadcast service system according to the present invention, only the authenticated subscribers and the authenticated channel for each subscriber are performed by performing an authentication procedure for subscribers and channels when users access the service. By multicasting broadcast stream data, paying and differentiating broadcasting services are possible, which not only improves the quality of services but also reduces the bandwidth of the entire network, thereby enabling efficient network management.

Claims (6)

A broadcast server, an authentication server provided with a DHCP server, a multicasting router connected to the authentication server through the Internet, an L3 switch connected to the multicasting router and equipped with an IGMP server, an L2 switch connected to the L3 switch, and the In the broadcast stream data transmission method in the IP-based broadcast service system consisting of a terminal (set-top box or PC) connected to the L2 switch, A tenth step of the broadcasting server multicasting a plurality of broadcast stream data to the L3 switch; A twenty step of, when the power of the terminal is turned on, the authentication server performs an authentication procedure for a user of the terminal, and the DHCP assigns an IP to the terminal; A thirtieth step, wherein the authentication server establishes a subscriber profile information database on the L2 switch and the L3 switch; Step 40, by the broadcasting server, transmitting software and TV portal information (EPG, channel selection guide information) necessary for the terminal to the corresponding terminal; If the user selects a desired channel through the terminal, the terminal transmitting a membership report message (IGMP join) to the IGMP server of the L3 switch via the L2 switch; And After receiving the membership report message (IGMP join) from the L3 switch, the L3 switch searches profile information of the corresponding subscriber, and if the user and channel are authenticated, joins a group to establish a group information table of a multicast session and then subscribes to the subscriber. 60. A method of transmitting broadcast stream data in an IP-based broadcast service system, comprising: transmitting a broadcast stream data to a terminal; The method of claim 1, In the tenth step, the L3 switch further includes an eleventh step of discarding all packets if there is no terminal subscribed to the multicast group after receiving a plurality of broadcast stream data from the broadcast server Broadcast stream data transmission method in an IP-based broadcast service system. The method of claim 1, The method of claim 40, wherein the IP address and MAC address information mapped to each channel is recorded in the channel selection guide information. The method of claim 1, In step 60, the membership report message (IGMP join) includes an IGMP type field in which version and type information of an IGMP message is stored; A maximum response time field in which maximum response time information is stored; Checksum field; And A method for transmitting broadcast stream data in an IP-based broadcast service system, comprising a multicast group address field filled with "0" in the case of a general query message and a specific group address in the case of a group-specific query message. The method of claim 1, After step 60, when the terminal transmits a membership rib group message (IGMP leave) to the L3 switch via the L2 switch, the L3 switch further includes a seventy step of stopping broadcast stream data transmission. A broadcast stream data transmission method in an IP based broadcast service system. The method of claim 5, In step 70, the membership leave group message (IGMP leave) is an IGMP type field in which version and type information of an IGMP message is stored; A maximum response time field in which maximum response time information is stored; Checksum field; And A method for transmitting broadcast stream data in an IP-based broadcast service system, comprising a multicast group address field filled with "0" in the case of a general query message and a specific group address in the case of a group-specific query message.

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