WO2007033553A1 - A multicast managing method and the device thereof in pon system - Google Patents

Abstract

A PON system multicast right monitor method and the device thereof in PON system, comprising, the OLT sets user on demand right, and the OLT distributes the public downstream service channel number and the public key for the authorized user, and the OLT updates the public downstream service channel number and the public key on specified time, and sets the preview time for each preview and the preview times within the predetermined time for the user who has the preview right to monitor the multicast service right. The present invention realize monitoring the user on demand process in PON network access system, such that only the user who has the corresponding right can obtain the corresponding service, and such that the commercial video on demand service is performed in PON system.

Description

 Multicast authority management and control method and device for passive optical network system

Technical field

 The present invention relates to the field of communications technologies, and in particular, to a multicast optical network system multicast authority management method and apparatus. Background of the invention

 In recent years, with the rapid development of the Internet and the popularity of personal computers, the surge in Internet data flow has dramatically limited the capacity of the access part. The traditional copper access method in the access network is obviously unable to meet the growth of communication services. For this reason, optical fiber transmission is gradually being widely used. The optical fiber has the advantages of transmission frequency bandwidth, large capacity, low loss, strong anti-interference ability, etc., and is very suitable as a transmission medium for high-speed and broadband services. Among various optical access technologies, PON (Passive Optical Network) has attracted attention due to the advantages of low cost of laying, operation and maintenance, transparency to services, and easy upgrade due to the use of passive nodes.

 As an emerging broadband access fiber technology, PON does not require node equipment at the optical branch point. It only needs to install a simple optical splitter, thus saving fiber cable resources, sharing bandwidth resources, saving equipment room investment, and equipment security. High performance, fast network construction, and low cost of integrated network construction.

 At the same time, with the rapid development of communication technology, digital multimedia signals are also increasingly favored by people. Applications such as video or audio on-demand, multicast and broadcast through access networks will appear more and more in the present and future. In the network access system.

 Figure 1 shows the structure of a PON multicast network. The passive optical network accesses signals from the OLT (optical network line terminal), and is assigned to each user ONU/ONT through an ODN (Optical Distribution Network). The ONT is an optical network user. The terminal is directly located at the user end; and the ONU is an optical network subscriber unit, and is connected to the client end and other networks such as Ethernet, and the multimedia signal can be viewed at the user end. The OLT is located at the central office, the ONU/ONT is located at the user end, and the direction of the OLT to the ONU/ONT is the downlink direction, and vice versa. In the downlink direction, the time division multiplexing based multicast mode is adopted. The ODN distributes the optical signals input by the OLT to a number of output clients evenly according to the power, and generally has a distribution scheme of 1 minute 16, 1 minute 32 or 1 minute 64.

The existing multicast video on demand operation process is shown in FIG. 2. FIG. 2 is a flow chart of a method for performing multicast video on demand through a PON access system. In the figure, the OLT allocates an independent public downlink service channel for each multicast group, and each multicast group sends only one multicast data stream, and the multicast data stream only those ONT users send out ONT applications. In order to receive on this channel normally. The OLT also generates a public key for each multicast group. When the multicast data stream is sent, the key is used for encryption; and the key and the public service channel number are sent to the multicast receiving authority by using the management channel. The ONT, the ONT uses the key to decrypt the multicast data stream on the public service channel, and receives and forwards the multicast data stream to the user. It is not difficult to see that the method only implements the on-demand application of the users under multiple ONTs under the same PON port. After the OLT sends only one multicast data on each PON port as needed, multiple users can simultaneously perform on-demand broadcasting. Program. Without considering the management of the user's on-demand rights, the user-on-demand process under the ONT is completely uncontrolled, and therefore, it is impossible to develop various multicast services that must be controlled, such as video on demand services, which requires each on the OLT. The on-demand rights of each multicast group of the user under the ONT are separately controlled, and the video on-demand service cannot be extended if the user under the ONT is not controlled.

 Therefore, it is necessary to provide a method for controlling the rights of each user on the on-demand side.

Summary of the invention

 The object of the present invention is to provide a method and a device for controlling the multicast rights of a passive optical network system. By setting a user-on-demand right on the OLT, the OLT allocates a public downlink service channel number and a public key to the authorized user. The public downlink service channel number and the public key are updated periodically, and the preview time and the preview time in the specified time are set for the user with the preview permission, which is used to control the multicast service authority.

 The object of the invention is achieved by the following technical solutions:

 A multicast privilege management and control method for a PON passive optical network system, including: - A, a passive optical network PON system sets a user on-demand permission at an optical network line terminal OLT;

 B. In the process of the user performing the multicast service, the OLT allocates the multicast group common downlink service channel number and the public key for the multicast service to the user with the on-demand service.

 The user on-demand permission is determined according to the passive optical network identifier PON ID of the user's optical network user terminal ONT.

 The user rights include: authorization, unauthorized, and/or previewable.

 The step A further includes:

 Al, set the preview time and/or limit the number of previews for the specified time for users who can preview.

 The step B includes -

Bl, determining, according to the set user-on-demand permission, that the user is an authorized user; or a user having preview permission, and the preview time of the user with the preview permission does not reach the prescribed upper limit and/or the preview number within the specified time does not meet the requirement Upper limit

 B2. The OLT sends the public downlink service channel number and a public key.

 The step B includes: starting from the allocation of the public downlink service channel number and the public key, and updating the public downlink service channel number every time the specified time is reached.

The step B further includes - The public key is updated every time the specified time is reached, starting from the allocation of the public downlink service channel number and the public key.

 The method further includes:

 If the user is determined to be an unauthorized user, the OLT terminates the processing of the user's on-demand application.

 A multicast optical network system multicast authority control device, comprising:

 a user right authentication module, configured to set and save user rights, and authenticate the user according to the set user rights in the multicast operation;

 The security management module is configured to allocate a multicast group public downlink service channel number and a public key for the user multicast service with the corresponding authority.

 The device also includes:

 The timer is used to time the operation of the downlink service channel number and the public key to the security management module; and/or, the preview management module is configured to control the preview operation of the user with the preview permission.

 It can be seen from the technical solution provided by the present invention that the present invention implements the control of the on-demand rights of the PON network access system, and divides the user's on-demand rights into authorized, unauthorized, and previewable, so that only users with corresponding rights can The corresponding service is obtained, and the user with the preview permission can preview the program stream for a short time, so that the commercial video on demand service can be carried out in the PON system.

BRIEF DESCRIPTION OF THE DRAWINGS

 1 is a schematic structural diagram of a prior art PON multicast network;

 2 is a flow chart of operation of multicast video on demand in a prior art PON access system;

 FIG. 3 is a flow chart of the operation and control operation of the user's on-demand authority in the PON access system of the present invention.

Mode for carrying out the invention

 The core idea of the present invention is to provide a multicast optical network system multicast authority management method and device. By setting a user's on-demand permission on the OLT, for an authorized user, the OLT allocates a public downlink service channel number and a public key to the user, and Timing update realizes the control of multicast service permissions.

 The present invention provides a method for controlling the multicast rights of a passive optical network system. Referring to FIG. 3, an operation flowchart of the method according to the present invention is provided. The method for controlling the multicast rights of the PON system specifically includes: Step 10: The OLT receives And processing the on-demand request of the user under the ONT;

 The user can send the on-demand request through the IGMP (Internet Group Management Protocol) protocol;

Step 11: The OLT authenticates the user. The user's on-demand rights can be set in advance on the OLT. For example, the user permission table for each multicast group is configured for each user, and the on-demand rights of each user are specified according to the PON ID of each user's ONT, and the user permission table defines the user's on-demand rights. : Authorized, Unlicensed, Previewable, etc., and sets the number of previews for each preview time and/or specified time for previewable users;

 After receiving the on-demand request of the user, the OLT obtains the PON ID of the ONT of the user, and determines the on-demand permission of the user according to the PON ID according to the user permission table;

 Step 12: If the user is authorized or has preview permission, the OLT searches whether the local database has the multicast group data stream requested by the user;

 The OLT searches for a multicast group data stream requested by the user in the local database according to the user's request for on-demand; the local database is used to store local multicast group data stream information;

 Step 13: If the multicast group data stream is not available, the OLT requests the upstream device to obtain the multicast group data stream. If the OLT does not find the multicast group data stream requested by the user in the local database, the OLT goes upstream. The device applies for obtaining the multicast group data stream; the upstream device includes a network device that can obtain a multicast group data stream, such as a routing server and a broadband access server;

 Step 14: The OLT allocates a public downlink service channel number and a public key for the multicast group data flow, and starts timing, determining whether the public downlink service channel number and the key are timed out;

 After obtaining the multicast group data stream requested by the user, the OLT allocates a public downlink service channel number and a public key for the multicast group data stream, and the OLT starts timing after generating the public downlink service channel number and the public key. It is used to determine whether the current public downlink service channel number and the key are timed out, and update the public downlink service channel number and the public key every time the specified time is reached, that is, the OLT periodically replaces the public downlink service channel number and the public key, and the specified time value may be Determined according to needs; for simple implementation, the replacement operation can only replace the public key, and keep the public downlink service channel number unchanged;

 Step 15: The OLT sends an encrypted multicast data stream on the allocated public downlink service channel.

 After the OLT completes the foregoing operation, the multicast group data requested by the user is sent on the public downlink service channel that is allocated, and the multicast group data stream is encrypted by using the allocated public key; if the OLT is in the foregoing step 12 If the multicast group data stream requested by the user is found in the local database, the operation of step 15 is directly performed;

 Step 16: After the above operation is completed, determine whether the user has preview permission.

Step 17: If the user has the preview permission, determine whether the preview time and the preview number have arrived; if the user has the preview permission, judge according to the preview time specified in the user permission table and the preview number in the specified time Whether the user's preview time and/or preview number has arrived; Step 18: If it is determined that the preview time and/or the preview number has expired, the OLT stops sending the public downlink service channel number and the key of the multicast group data stream to the ONT of the user;

 When it is determined that the preview time and/or the preview number have expired, the OLT stops sending the public downlink service channel number and the key of the multicast group data stream to the ONT of the user, and the preview operation of the user is prohibited;

 Step 19: If the user does not have the preview permission, that is, the user right is authorized, or the above-mentioned judgment that the preview time and the preview number of the user do not reach the specified limit, the OLT passes the public downlink service channel number of the multicast group and the public through the management channel. The key is sent to the user's ONT;

 The multicast group data stream requested by the user has been sent through the public downlink service channel allocated by the OLT, and the ONT of the user can receive the multicast group data stream information only after obtaining the public downlink service channel number and the key;

 Step 20: If it is determined in step 11 that the user is an unauthorized user, the OLT terminates the processing of the on-demand application of the user.

 The present invention also provides a multicast privilege management and control device for a passive optical network system. The device is disposed at the OLT end, and includes the following device-user privilege authentication module, configured to set user rights according to the PON ID of each user, in the multicast operation. The user authority is authenticated according to the user PON ID; the pre-set authority may be in the form of a user permission table, and the user's on-demand rights are specified in the user permission table: authorization, unauthorized, previewable, etc. Levels, and set the number of previews per preview time and/or specified time for users who can preview;

 a security management module, configured to allocate a multicast group public downlink service channel number and a public key for the user multicast service with the corresponding authority;

 The timer is configured to time the operation of the downlink service channel number and the public key to the security management module, so that the security management module can periodically update the delivered information.

 The preview control module is configured to control the preview operation of the user with the preview permission, including detecting whether the preview operation of the preview user exceeds the duration specified in the user authorization identification module, and whether the preview number within the specified time exceeds the user authorization identification module The number of times specified in the table.

 In summary, the present invention implements the control of the on-demand process of the PON network access system, so that only users with corresponding rights can obtain corresponding services, so that commercial video on demand services can be carried out in the PON system.

 The above is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of changes or within the technical scope disclosed by the present invention. Alternatives are intended to be covered by the scope of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

Rights request  A method for controlling and controlling multicast rights of a passive optical network system, comprising:  A. Passive optical network PON system sets user on-demand permission at the optical network line terminal OLT;  B. In the process of the user performing the multicast service, the OLT allocates the multicast group common downlink service channel number and the public key for the multicast service to the user with the on-demand service.  The method for controlling the multicast rights of the passive optical network system according to claim 1, wherein the user-on-demand permission is determined according to the passive optical network identifier PON ID of the optical network user terminal ONT of the user.  The privilege management and control method for a PON system according to claim 1 or 2, wherein the user rights include: authorization, unauthorized, and/or previewable.  The multicast authority management and control method for a passive optical network system according to claim 3, wherein the step A further includes:  Al, set the preview time and/or the number of previews for the specified time for the previewable user.  The method for controlling the multicast rights of the passive optical network system according to claim 4, wherein the step B comprises:  Bl, determining, according to the set user-on-demand permission, that the user is an authorized user; or a user having preview permission, and the preview time of the user with the preview permission does not reach the prescribed upper limit and/or the preview number within the specified time does not meet the requirement Upper limit  B2. The OLT sends the public downlink service channel number and a public key.  The method for controlling the multicast rights of the passive optical network system according to claim 1, wherein the step B comprises: starting the time allocation of the public downlink service channel number and the public key, and updating the location every time the specified time is reached. The public downlink service channel number.  The method for controlling the multicast rights of the passive optical network system according to claim 1 or 6, wherein the step B further comprises:  The public key is updated from the allocation of the public downlink service channel number and the public key, and the public key is updated every time the specified time is reached.  The method for controlling the multicast rights of the passive optical network system according to claim 1, wherein the method further comprises:  If the user is determined to be an unauthorized user, the OLT terminates the processing of the user's on-demand application. 9. A passive optical network system multicast authority control device, characterized in that: a user right authentication module, configured to set and save user rights, and authenticate the user according to the set user rights in the multicast operation;  The security management module is configured to allocate a multicast group public downlink service channel number and a public key for the user multicast service with the corresponding authority.  The apparatus for controlling the multicast rights of the passive optical network system according to claim 9, wherein the apparatus further comprises:  The timer is used to time the operation of the downlink service channel number and the public key to the security management module; and/or, the preview management module is configured to control the preview operation of the user with the preview permission.