CN101141276A - Realization method of controllable multicast service - Google Patents

Abstract

The invention discloses a method for realizing a controllable multicast service. The method is as follows: a user sends a multicast service joining request to an access control device; the access control device transparently transmits the request to the multicast network side; and The access control device judges the multicast authority of the user. If the user has the authority to receive multicast programs, the access control device forwards the multicast data stream sent from the multicast network to the user, otherwise it does not send the multicast data stream to the user. Forward data.

Description

Realization method of controllable multicast service

technical field

The invention relates to multicast network technology, in particular to a method for realizing controllable multicast services.

Background technique

On the Internet, multimedia services such as streaming media, video conferencing, and video-on-demand are becoming an important part of information transmission. The unicast method of point-to-point transmission cannot adapt to this type of business transmission characteristics, that is, one-point transmission and multi-point reception, because the server must provide each receiver with a copy of the IP message with the same content, and the same content is also repeatedly transmitted on the network packets, occupying a lot of resources. Although IP broadcasting allows a host to send an IP packet to all hosts on the same network, network resources are wasted because not all hosts need these packets. In this case, the multicast service emerges as the times require, and its appearance provides a method for a host to send messages to specific multiple receivers.

Currently, multicast routers are used in conjunction with switches to implement multicast services on the network. The network model is shown in Figure 1. The protocol supported by the multicast router is mainly the PIM-SD protocol. The protocol supported on the network switch is mainly the Multicast Control Protocol (IGMP). As shown in Figure 2, when a user uses a multicast program, the process is as follows:

(1), the user sends a multicast service join request to the network switch;

(2), the network switch transparently transmits the request to the multicast network side;

(3), the multicast network sends the multicast data flow to the switch;

(4) The network switch sends the multicast data stream to the user.

Through the above process, the user can receive the data stream of the multicast program. The procedure when a user stops using a multicast program is as follows:

(1), the user sends a multicast service leave request;

(2) The network switch stops sending multicast data to the user, and transparently transmits the request to the multicast network side at the same time.

(3) If there is no other user on the user side of the network switch to use the multicast service, the multicast network will no longer send multicast data to the switch.

Although the existing technology realizes the multicast service, since the above two protocols do not have user management functions, all users who can access the Internet can use the multicast service, which is not convenient for operators to manage and collect fees.

Contents of the invention

The purpose of the present invention is to provide a controllable multicast service implementation method, so that service providers can manage access users.

Technical scheme one of the present invention:

A method for realizing a controllable multicast service, the method comprising the following steps:

The user sends a multicast service joining request to the access control device;

The access control device transparently transmits the request to the multicast network side; and

The access control device judges the user's multicast authority. If the user has the authority to receive multicast services, the access control device forwards the multicast data flow sent by the multicast network to the user, otherwise it does not send the multicast data stream to the user. User forwards data.

Technical scheme two of the present invention:

A method for realizing a controllable multicast service, the method comprising the steps of:

(1), the user sends a multicast service joining request to the access control device;

(2), the access control device judges the user's multicast authority; if the user has the authority to receive the multicast service, then the user's multicast service joining request is sent to the network side and continues step (3), otherwise the user is discarded request message, end the processing of the request;

(3) The access control device forwards the multicast data stream sent by the multicast network to the user.

Technical scheme three of the present invention:

A method for realizing a controllable multicast service, the method comprising the steps of:

a. The user sends a multicast service joining request to the access control device;

B. The access control device judges the user's multicast authority; if the user has the authority to receive the multicast service, then continue to step c, otherwise discard the user's request message, and end the processing of the request;

c. The access control device further determines whether the same multicast service request has been sent to the multicast network, and if so, proceeds to step d, otherwise sends the user's multicast join request to the multicast network side, proceeds to step d;

d. The access control device sends the multicast data stream sent by the multicast network to authorized users.

in:

The control device is a network switch, a digital subscriber line access multiplexer or other devices with similar functions.

By adopting the method of the present invention, the operator can realize "refinement and individualized" operation by controlling the authority of users, and provide different services for different user groups, thereby increasing operating income.

Description of drawings

Fig. 1 is the network model figure that realizes multicast service in the prior art;

FIG. 2 is a schematic diagram of the principle of implementing multicast services in the prior art;

Fig. 3 is a schematic diagram of the principle of realizing the controllable multicast service in the present invention;

Fig. 4 is the flow chart of the present invention to realize the controllable multicast service scheme 1;

Fig. 5 is the flow chart that realizes the controllable multicast service scheme 2 of the present invention;

FIG. 6 is a schematic diagram of a multicast controllable network switch of the present invention;

Fig. 7 is a schematic diagram of the processing of the user request message by the network switch of the present invention;

FIG. 8 is a flow chart of the third embodiment of the controllable multicast service in the present invention.

Detailed ways

The controllable multicast of the present invention is to realize the control of user access by using relevant protocols on control devices with similar functions such as network switch or digital subscriber line access multiplexer (DSLAM). Such as using the Multicast Control Protocol (referred to as IGMP), 802.1X protocol and so on. This embodiment uses the multicast control protocol as an example to describe the present invention. The networking diagram of the present invention is shown in FIG. 1 .

In order to solve the problem of user management, a local database is established on the control device, and the user's authority is configured in the database. When receiving a user joining request message, the user's authority is queried from the database and controlled according to the user's authority. For message forwarding, see Figure 3.

In the multicast service, the program is unique and corresponds to the multicast IP address one by one, and the user's multicast authority is configured according to the user's physical location or logical location.

Permissions are configured based on physical locations, and each user is assigned a unique device port, as shown in Table 1.

Permissions are configured in logical locations, and each user is assigned a unique user VLAN ID, as shown in Table 2.

Table I

Name of programme program address user location username user location username user location username Port 0 Zhang San Port 1 Li Si Port 12 Wang Wu CCTV-5 224.1.10.1 have have have HBO 224.1.10.2 have No have Phoenix Television 224.1.10.3 have have No

Table II

Name of programme program address user location username user location username user location username VLAN 0 Zhang San VALN 16 Li Si VALN 100 Wang Wu CCTV-5 224.1.10.1 have have have HBO 224.1.10.2 have No have Phoenix Television 224.1.10.3 have have No

Refer to 4. Take the IPGM snooping protocol implemented by the network switch as an example. The process of controllable multicast is as follows:

(1) The user sends a multicast service join request to the network switch;

(2) The network switch transparently transmits the request to the multicast network side, and simultaneously checks the user's authority from the local authority database according to the received user control message;

(3) If the user has the authority to receive the multicast program, the network switch forwards the multicast data stream sent by the multicast network to the user, otherwise the multicast data stream is not sent to the requesting user.

Refer to 5. In order to further optimize the service control process, for step (2) in FIG. 4, it is also possible to determine whether to send the user's multicast service join request to the network side according to the analysis result of the user's usage authority. The process is as follows:

(1), the user sends a multicast service joining request to the access control device;

(2), the access control device judges the user's multicast authority; if the user has the authority to receive multicast programs, then the user's multicast service joining request is sent to the network side and continues step (3), otherwise the user is discarded request message, end the processing of the request;

(3) The access control device forwards the multicast data flow sent by the multicast network to the requesting user.

Referring to FIG. 6 , the network switch controllable multicast module part includes: user side control message receiving module, control message analysis module, IGMP message processing module and multicast data message sending control module. The IGMP message processing module is mainly responsible for analyzing the user's multicast authority.

Referring to Figure 7, the processing of the message is as follows:

The user-side control message receiving module monitors and receives all control messages sent by the user, and then sends these messages to the control message analysis module.

The user packet analysis module classifies the control packets according to the content of the protocol field in the control packets, and then sends various packets to the corresponding module for processing. If it is an IGMP control message, it is sent to the IGMP message processing module; otherwise, other message processing is performed.

The IGMP message processing module obtains the multicast address and the user's location from the user's request message, and queries the user's multicast permission from the local database according to the multicast address and the user's location to determine whether the user has permission to watch the multicast programs; if there is no authority, no operation is performed; if there is authority, a control message is sent to the multicast data packet sending control module.

The multicast data message sending control module obtains the location information of the user from the command of the control message, and then activates the multicast message sending function of the user according to the command. When the network switch receives the multicast data, it will send it to the user.

Referring to Figure 8, taking the implementation of the IGMP Proxy (IGMP Proxy) protocol by a network switch as an example, the flow of the controllable multicast is as follows:

(1) The user sends a multicast service join request to the network switch.

(2) The network switch first queries the local database to determine whether the user has the right to use the multicast service. If there is permission, go to step (3), if not, discard the user's request message, and end the request processing process.

(3), further judge whether the network switch has sent the same multicast program request to the multicast network; if the same request has been sent, it means that the multicast program already exists, and the multicast request is no longer sent to the multicast network ; If it has not been sent before, send a multicast join request to the multicast network. After the multicast network receives the request, it sends the multicast program to the network switch.

(4) The network switch sends the multicast data to users who have permission to use it.

Wherein, the processing process of the user request message refers to FIG. 6 and FIG. 7 .

In the present invention, the process when the user stops using the multicast program is the same as that of the prior art.

Claims (9)

1. the implementation method of a controllable multicast service is characterized in that comprising step:

The user sends multicast service to access control equipment and joins request;

Access control equipment is transparent to the multicast network side with described request; And

Access control equipment is judged this user's multicast authority, if this user has the authority of receiving multicast business, then access control equipment multicast traffic stream that multicast network is sent is transmitted to this user, otherwise does not transmit data to this user.

2. the method for claim 1, access control equipment judge that user right comprises step:

From the control message that the user sends, obtain multicast address and user's position;

Multicast authority according to position inquiring user from database of multicast address and user.

3. method as claimed in claim 1 or 2 is characterized in that, described access control equipment is the network switch, Digital Subscriber Line Access Multiplexer or functionally similar other equipment.

4. the implementation method of a controllable multicast service is characterized in that comprising step:

(1), the user sends multicast service to access control equipment and joins request;

(2), access control equipment is judged this user's multicast authority; If this user has the authority of receiving multicast business, then user's multicast service being joined request is sent to network side and continues step (3), otherwise abandons user's request message, finishes this time processing of request;

(3), access control equipment multicast traffic stream that multicast network is sent is transmitted to described user.

5. the multicast authority of judging this user in the method as claimed in claim 4, step (2) comprises step:

From the control message that the user sends, obtain multicast address and user's position;

Multicast authority according to position inquiring user from database of multicast address and user.

6. as claim 4 or 5 described methods, it is characterized in that described control appliance is the network switch, Digital Subscriber Line Access Multiplexer or functionally similar other equipment.

7. the implementation method of a controllable multicast service is characterized in that comprising step:

A, user send multicast service to access control equipment and join request;

B, access control equipment are judged this user's multicast authority; If this user has the authority of receiving multicast business then continues step c, otherwise abandon user's request message, finish this time processing of request;

C, access control equipment further judge whether to send identical multicast service request to multicast network, if then carry out steps d, otherwise join request to multicast network side transmission user's multicast, carry out steps d;

The multicast traffic stream that d, access control equipment send multicast network sends to the user of authority.

8. method as claimed in claim 7, judge among the step b that user's multicast authority comprises step:

From the control message that the user sends, obtain multicast address and user's position;

Multicast authority according to position inquiring user from database of multicast address and user.

9. as claim 7 or 8 described methods, it is characterized in that described control appliance is the network switch, Digital Subscriber Line Access Multiplexer or functionally similar other equipment.

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