WO2012103761A1 - Method for detecting quality of multicast service and terminal - Google Patents

Abstract

A method for detecting quality of a multicast service, an optical line terminal and an optical network unit. The method comprises: an optical line terminal selecting one or more monitoring-dedicated multicast groups, and sending characteristic parameters of the monitoring-dedicated multicast group to a designated optical network unit; the optical line terminal sending a multicast join packet of the monitoring-dedicated multicast group to a multicast source, and upon receiving a monitoring multicast service flow that corresponds to the multicast join packet and is sent by the multicast source, sending the monitoring multicast service flow to the designated optical network unit; and upon receiving the monitoring multicast service flow, the designated optical network unit detecting quality of the monitoring multicast service flow according to the characteristic parameters of the monitoring-dedicated multicast group. According to the present invention, the quality of a multicast video provided to a user can be monitored in time.

Description

 Method and terminal for detecting multicast service quality

Technical field

 The present invention relates to a method for deploying a multicast service on a Passive Optical Network (PON) broadband network, and specifically relates to a method for detecting the quality of a multicast service, and an Optical Line Terminal (OLT) and an optical network. Optical Network Unit (ONU). Background technique

 Multicast video services are becoming more and more widely used in broadband networks. PON network technology is a relatively common method of network broadband access. The PON system is a point-to-multipoint tree structure in the physical topology, and is composed of an OLT (Optical Line Terminal), an Optical Distribution Network (ODN), and an Optical Network Unit (ONU). Composition.

 With the widespread application of multicast video services in PON broadband networks, how to conveniently and timely monitor the quality of multicast video provided to users on PON broadband networks, for network operators and equipment vendors that provide corresponding network equipment, more and more important. Summary of the invention

 The technical problem to be solved by the present invention is to provide a method for detecting the quality of a multicast service, an optical line terminal, an optical network unit, and monitoring the quality of the multicast service provided to the user.

 In order to solve the above technical problem, the present invention provides a method for detecting the quality of a multicast service, including:

 The optical line terminal selects one or more monitoring dedicated multicast groups, and sends the characteristic parameters of the monitoring dedicated multicast group to the designated optical network unit;

 The optical line terminal sends the multicast join packet of the monitoring dedicated multicast group to the multicast source, and after receiving the monitored multicast service flow corresponding to the multicast join packet sent by the multicast source, The monitoring multicast service flow is sent to the designated optical network unit;

After the specified optical network unit receives the monitored multicast service flow, according to the monitoring The quality of the monitored multicast service flow is detected by using a characteristic parameter of the multicast group.

 Preferably, the foregoing method further has the following feature: the optical line terminal transmitting, by the optical line terminal, the monitoring multicast service flow to the designated optical network unit, further comprising: sending, by the optical line terminal, detection switch control information to the Designated optical network unit;

 The step of detecting, by the optical network unit, the quality of the monitored multicast service flow according to the characteristic parameter of the monitoring dedicated multicast group includes:

 The optical network unit determines whether to enable the service quality detection function according to the detection switch control information, and if the service quality detection function is determined and enabled, the monitoring multicast service flow is performed according to the characteristic parameter of the monitoring dedicated multicast group. Quality is tested.

 Preferably, the method further has the following features: the characteristic parameters of the monitoring dedicated multicast group include: the bandwidth of the monitoring dedicated multicast group, the monitoring time interval, and the threshold of the number of allowed packet loss, the optical network unit according to the The steps of monitoring the quality of the monitored multicast service flow by monitoring the characteristic parameters of the dedicated multicast group include:

 The optical network unit receives the number of packets of the monitored multicast service flow in the monitoring time interval during the monitoring time interval, and then calculates the bandwidth in combination with the bandwidth of the monitoring dedicated multicast group. Comparing the number of lost packets in the time period of the monitoring interval, comparing the number of lost packets with the threshold of the number of allowed packet loss, and if the number of lost packets is greater than the threshold for the number of allowed packets, The alarm information is reported on the optical line terminal.

 Preferably, the above method further has the following features:

 After receiving the alarm information, the optical line terminal reports the alarm information to the network management system, where the alarm information includes: the number of lost packets in the monitored multicast service flow during the monitoring time interval. And the corresponding optical network unit interface information.

 Preferably, the foregoing method further has the following features: after the step of receiving, by the optical network unit, the number of packets of the monitored multicast service flow in the period of the monitoring time interval, the method further includes: the optical network unit The monitoring multicast service flow is discarded.

 Preferably, the foregoing method further has the following feature: the optical line terminal sends the characteristic parameter of the monitoring dedicated multicast group to the optical network unit by running a management and maintenance configuration interface.

In order to solve the above problems, the present invention also provides an optical line terminal, including: a configuration module, configured to: configure one or more monitoring dedicated multicast groups, configure characteristic parameters of the monitoring dedicated multicast group, and send the characteristic parameters of the monitoring dedicated multicast group to the optical network unit;

 a transmission control module, configured to: send a multicast join packet of the monitoring dedicated multicast group selected by the selection module to the multicast source, and receive the multicast feed packet corresponding to the multicast join packet sent by the multicast source After monitoring the multicast service flow, the monitored multicast service flow is sent to the designated optical network unit.

 Preferably, the optical line terminal further has the following features:

 The transmission control module is further configured to: send the detection switch control information to the designated optical network unit in the process of transmitting the monitored multicast service flow to the designated optical network unit.

 Preferably, the optical line terminal further has the following features:

 The characteristic parameters of the monitoring dedicated multicast group include: the bandwidth of the monitoring dedicated multicast group, the monitoring time interval, and the threshold of the number of allowed packet loss.

 In order to solve the above problems, the present invention also provides an optical network unit, including:

 The configuration module is configured to: perform local configuration according to the characteristic parameters of the received monitoring private multicast group;

 a detecting module, configured to: after receiving the monitoring multicast service flow corresponding to the monitoring dedicated multicast group, performing the monitoring multicast service according to the characteristic parameter of the monitoring private multicast group configured by the configuration module The quality of the flow is tested.

 Preferably, the optical network unit further has the following features: the detecting module includes: a determining unit, configured to: determine whether to open the service quality detecting unit according to the received detecting switch control information;

 The service quality detecting unit is configured to: detect, in an open state, the quality of the monitored multicast service flow according to a characteristic parameter of the monitoring dedicated multicast group.

 Preferably, the optical network unit further has the following features: The characteristic parameters of the monitoring dedicated multicast group include: the bandwidth of the monitoring dedicated multicast group, the monitoring time interval, and the threshold of the number of allowed packet loss, the service quality detecting unit Includes:

a statistical subunit, which is set to: count every monitoring time interval between the monitoring time Receiving the number of packets of the monitored multicast service flow in a period of time;

 a calculation subunit, configured to: calculate, according to the bandwidth of the monitoring dedicated multicast group, the monitoring time interval, and the number of received packets, the number of lost packets in the monitoring time interval; The unit is configured to: compare the number of lost packets with the threshold of the number of allowed packet loss, and if the number of lost packets is greater than the threshold of the number of allowed packets, report the alarm information, where the alarm information includes: And monitoring the number of packet loss and the corresponding optical network unit interface information in the time period of the monitoring time interval of the multicast service flow.

 Preferably, the optical network unit further has the following features:

 The statistic subunit is further configured to: after receiving the number of packets of the monitored multicast service flow within a period of the monitoring time interval, discarding the monitoring multicast service flow.

 In summary, the embodiments of the present invention provide a method for detecting the quality of a multicast service, an optical line terminal, and an optical network unit, which can monitor the quality of the multicast video provided to the user in time.

BRIEF abstract

 1 is a topological structural diagram of a PON broadband network video service according to the present invention;

 2 is a schematic diagram of an OLT according to an embodiment of the present invention;

 3 is a schematic diagram of an ONU according to an embodiment of the present invention;

 4 is a flowchart of a method for detecting a quality of a multicast service according to the present invention;

 FIG. 5 is a flowchart of a method for detecting a quality of a multicast service according to an embodiment of the present invention.

Preferred embodiment of the invention

 For a better understanding of the invention, the invention will be further described in conjunction with the drawings and specific embodiments.

 FIG. 1 is a schematic diagram showing the basic structure of a PON broadband network video service according to the present invention.

 After the video surveillance function is added to the present invention, the network networking architecture does not change. Additional functional modules are added to the ONU device only on the OLT device.

Adding a multicast monitoring module to the OLT device, as shown in FIG. 2, the OLT of the embodiment of the present invention The method includes: a configuration module and a transmission control module, wherein

 a configuration module, configured to configure one or more monitoring dedicated multicast groups, configure characteristic parameters of the monitoring dedicated multicast group, and send the characteristic parameters of the monitoring dedicated multicast group to the ONU;

 a transmission control module, configured to send a multicast join packet of the monitoring dedicated multicast group selected by the selection module to the multicast source, and receive the monitoring group corresponding to the multicast join packet sent by the multicast source After the service flow is broadcast, the monitored multicast service flow is sent to the designated ONU.

 The transmission control module is further configured to send the detection switch control information to the designated ONU during the process of sending the monitored multicast service flow to the designated ONU, to perform service quality detection on the ONU. Take control.

 Specifically, the OLT device internally copies the monitored multicast service stream received by the uplink port to the corresponding PON port according to the ONU port information included in the monitoring dedicated multicast group, and simultaneously transmits the detection switch control information to the ONU device, Control whether the ONU enables multicast video surveillance.

 The characteristic parameters of the monitoring dedicated multicast group include: a bandwidth of the monitoring dedicated multicast group, a monitoring time interval, and a threshold of the number of allowed packet loss.

 The bandwidth parameter value of the configured monitoring private multicast group needs to be the same as the service flow bandwidth of the monitoring private multicast group on the video server.

 The characteristic parameters of the monitoring dedicated multicast group are downloaded to the ONU device locally through the OAM (Operation Administration Management) configuration interface between the OLT and the ONU. At the same time, the local ONU device starts or disables the multicast service quality monitoring service according to the corresponding detection switch control information.

 The embodiment of the present invention adds a multicast service quality monitoring module to the ONU device. As shown in FIG. 3, the ONU of this embodiment includes: a configuration module and a detection module, where

 a configuration module, configured to perform local configuration according to the characteristic parameter of the received monitoring private multicast group; the detecting module, configured to receive the monitoring multicast service flow corresponding to the monitoring dedicated multicast group, according to the configuration module The characteristic parameters of the monitored dedicated multicast group are configured to detect the quality of the monitored multicast service flow.

The detecting module may further include: a determining unit and a service quality detecting unit, where a determining unit, configured to determine, according to the received detection switch control information, whether to open the service quality detecting unit;

 The service quality detecting unit detects the quality of the monitored multicast service flow according to the characteristic parameter of the monitoring dedicated multicast group in an open state.

 The characteristic parameters of the monitoring dedicated multicast group include: the bandwidth of the monitoring dedicated multicast group, the monitoring time interval, and the threshold of the number of allowed packet loss, the service quality detecting unit may be further subdivided into: a statistical subunit, a calculation subunit and a detection subunit, wherein

 a statistical subunit, configured to receive, during the monitoring time interval, a number of packets that are received by the monitoring multicast service flow during a time period of the monitoring time interval; and a statistical subunit that counts time at the monitoring time interval After receiving the number of the monitored multicast service flows, the segment may be used to discard the monitored multicast service flow.

 a calculating subunit, configured to calculate, according to the bandwidth of the monitoring dedicated multicast group, the monitoring time interval, and the number of received packets, the number of lost packets in the monitoring time interval;

 The detecting subunit is configured to compare the number of the lost packets with the threshold of the number of allowed packet loss, and if the number of the lost packets is greater than the threshold of the number of allowed packets, the alarm information is reported, and the alarm information includes: And monitoring the number of packet loss and the corresponding optical network unit interface information in the time period of the monitoring time interval of the multicast service flow.

 4 is a flowchart of a method for detecting a quality of a multicast service according to the present invention. As shown in FIG. 4, the method may include the following steps:

 S10, the OLT selects one or more monitoring dedicated multicast groups, and sends the characteristic parameters of the monitoring dedicated multicast group to the designated ONU;

 S20. The OLT sends the multicast join packet of the monitoring dedicated multicast group to the multicast source, and after receiving the monitored multicast service flow corresponding to the multicast join packet sent by the multicast source, the monitoring is performed. Sending a multicast service flow to the designated ONU;

 S30. After receiving the monitored multicast service flow, the specified ONU detects the quality of the monitored multicast service flow according to the characteristic parameter of the monitoring dedicated multicast group.

FIG. 5 is a flowchart of a method for detecting a quality of a multicast service according to an embodiment of the present invention. As shown in FIG. 5, the method includes the following steps: First, the OLT selects one or more monitoring dedicated multicast groups, and sends the characteristic parameters of the monitoring dedicated multicast group to the ONU. The characteristic parameters of the monitoring dedicated multicast group include: monitoring the bandwidth of the dedicated multicast group, The monitoring interval and the percentage of error tolerance of the monitoring result allow the packet loss threshold to be equal to the product of monitoring the bandwidth of the dedicated multicast group, the monitoring interval, and the percentage of tolerance of the monitoring result.

 Step 101: The OLT continuously sends a multicast join packet of the monitoring dedicated multicast group to the multicast source to maintain the service flow corresponding to the monitoring dedicated multicast group between the OLT and the multicast source.

 Step 102: The OLT itself copies the monitored multicast service flow received by the uplink port to the corresponding PON port.

 Step 103: The PON port on the OLT and the multiple ONUs broadcast the monitoring multicast service flow to each ONU device through the ODN broadcast mechanism.

 Step 104: Each ONU determines whether to perform quality detection on the received monitoring multicast service flow according to the startup multicast service monitoring switch. If the switch is detected to be off, the monitoring multicast service packet is directly discarded; if the detection switch is enabled, Then, the service quality check is performed, and then the monitoring multicast service packet is discarded, and the trap (alarm) is reported.

 The video service quality detection method is as follows:

 The number of packets of the monitored multicast service flow received in this time period is read every interval of the detection interval, and the total number of lost packets in the period is calculated.

 Calculated as follows:

 Number of lost packets = configured bandwidth * Detection interval - Total number of received packets

 Allowed packet loss = configured bandwidth * detection interval * monitoring result tolerance error percentage If the calculated lost packet number is greater than the configured allowable packet loss threshold, if the video quality is considered to be problematic, a trap (alarm) is reported. The trap information includes: the number of lost packets and the ONU interface information during the detection interval, and then drops the monitored multicast service flow.

The invention fully utilizes the point-to-multipoint structure and broadcast mechanism of the PON system, realizes monitoring a single copy of the dedicated multicast group stream between the video server and the OLT, and broadcasts between the OLT and the ONU, and monitors the dedicated multicast group. The stream is discarded inside the ONU. Different ONU devices use the same multicast stream copy, which does not occupy the additional bandwidth of the ONU, and achieves efficient video quality monitoring. due to The configuration of the ONU is delivered through the OLT. It does not require configuration by the end user and is easy to deploy.

 In other embodiments, if the ONU port is configured with different levels of multicast service services (for example, different multicast video quality), multiple similar video quality monitoring templates can be configured (each template includes: monitoring dedicated multicast groups, monitoring) Traffic flow bandwidth, monitoring interval, video packet loss tolerance range, etc.).

 Correspondingly, in addition to configuring whether to enable the detection function switch, the ONU setting needs to specify which video quality monitoring template is used, and set the detection parameter information according to the template.

 The corresponding OLT needs to continuously send multiple multicast group join packets, and simultaneously maintain multiple dedicated monitoring dedicated multicast group service flows with the video source, and the ODN network between the OLT and the ONU also includes multiple monitoring dedicated Traffic flow of a multicast group.

One of ordinary skill in the art will appreciate that all or a portion of the above steps may be accomplished by a program instructing the associated hardware, such as a read-only memory, a magnetic disk, or an optical disk. Alternatively, all or part of the steps of the above embodiments may also be implemented using one or more integrated circuits. Correspondingly, each module/unit in the above embodiment may be implemented in the form of hardware or in the form of a software function module. The invention is not limited to any specific form of combination of hardware and software.

The above is only a preferred embodiment of the present invention, and of course, the present invention may be embodied in various other embodiments without departing from the spirit and scope of the invention. Corresponding changes and modifications are intended to be included within the scope of the appended claims.

Industrial applicability

 The embodiment of the invention provides a method for detecting the quality of a multicast service, an optical line terminal, and an optical network unit, which can timely monitor the quality of the multicast video provided to the user.

Claims

Claim  A method for detecting the quality of a multicast service, comprising:  The optical line terminal selects one or more monitoring dedicated multicast groups, and sends the characteristic parameters of the monitoring dedicated multicast group to the designated optical network unit;  The optical line terminal sends the multicast join packet of the monitoring dedicated multicast group to the multicast source, and after receiving the monitored multicast service flow corresponding to the multicast join packet sent by the multicast source, The monitoring multicast service flow is sent to the designated optical network unit;  After receiving the monitored multicast service flow, the designated optical network unit detects the quality of the monitored multicast service flow according to the characteristic parameter of the monitoring dedicated multicast group.  2. The method according to claim 1, wherein the process of the optical line terminal transmitting the monitoring multicast service flow to the designated optical network unit further comprises: the optical line terminal transmitting the detection switch control information Giving the designated optical network unit;  The step of detecting, by the optical network unit, the quality of the monitored multicast service flow according to the characteristic parameter of the monitoring dedicated multicast group includes:  The optical network unit determines whether to enable the service quality detection function according to the detection switch control information, and if the service quality detection function is determined and enabled, the monitoring multicast service flow is performed according to the characteristic parameter of the monitoring dedicated multicast group. Quality is tested.  The method of claim 1, wherein the monitoring the characteristic parameters of the dedicated multicast group comprises: the bandwidth of the monitoring dedicated multicast group, the monitoring time interval, and the threshold of the number of allowed packet loss, the optical network unit The step of detecting the quality of the monitored multicast service flow according to the characteristic parameter of the monitoring dedicated multicast group includes:  The optical network unit receives the number of packets of the monitored multicast service flow in the monitoring time interval during the monitoring time interval, and then calculates the bandwidth in combination with the bandwidth of the monitoring dedicated multicast group. Comparing the number of lost packets in the time period of the monitoring interval, comparing the number of lost packets with the threshold of the number of allowed packet loss, and if the number of lost packets is greater than the threshold for the number of allowed packets, The alarm information is reported on the optical line terminal.  4. The method of claim 3, further comprising: After receiving the alarm information, the optical line terminal reports the alarm information to the network management system. The alarm information includes: the number of lost packets and the corresponding optical network unit interface information in the monitoring time interval of the monitoring multicast service flow.  The method of claim 3, wherein, after the step of receiving, by the optical network unit, the number of packets of the monitored multicast service flow in the time period of the monitoring time interval, the method further includes: The optical network unit discards the monitored multicast service flow.  6. The method of claim 1, wherein  The optical line terminal sends the characteristic parameters of the monitoring dedicated multicast group to the optical network unit by using an operation management and maintenance configuration interface. 7. An optical line terminal comprising:  a configuration module, configured to: configure one or more monitoring dedicated multicast groups, configure the characteristic parameters of the monitoring private multicast group, and send the characteristic parameters of the monitoring dedicated multicast group to the optical network unit;  a transmission control module, configured to: send a multicast join packet of the monitoring dedicated multicast group selected by the selection module to the multicast source, and receive the multicast feed packet corresponding to the multicast join packet sent by the multicast source After monitoring the multicast service flow, the monitored multicast service flow is sent to the designated optical network unit.  8. The optical line terminal according to claim 7, wherein  The transmission control module is further configured to: send the detection switch control information to the designated optical network unit in the process of transmitting the monitored multicast service flow to the designated optical network unit.  9. The optical line terminal according to claim 7, wherein  The characteristic parameters of the monitoring dedicated multicast group include: the bandwidth of the monitoring dedicated multicast group, the monitoring time interval, and the threshold of the number of allowed packet loss.  10. An optical network unit, comprising:  The configuration module is configured to: perform local configuration according to the characteristic parameters of the received monitoring private multicast group; a detecting module, configured to: after receiving the monitoring multicast service flow corresponding to the monitoring dedicated multicast group, performing the monitoring multicast service according to the characteristic parameter of the monitoring private multicast group configured by the configuration module The quality of the flow is tested. The optical network unit according to claim 10, wherein the detecting module comprises: a determining unit, configured to: determine whether to turn on the service quality detecting unit according to the received detecting switch control information;  The service quality detecting unit is configured to: detect, in an open state, the quality of the monitored multicast service flow according to a characteristic parameter of the monitoring dedicated multicast group.  The optical network unit according to claim 11, wherein the characteristic parameters of the monitoring dedicated multicast group include: the bandwidth of the monitoring dedicated multicast group, the monitoring time interval, and the threshold of the number of allowed packet loss, the service The quality inspection unit includes:  And a statistical subunit, configured to: receive, according to the monitoring time interval, a number of packets that are received by the monitoring multicast service flow during a time interval of the monitoring time interval;  a calculation subunit, configured to: calculate, according to the bandwidth of the monitoring dedicated multicast group, the monitoring time interval, and the number of received packets, the number of lost packets in the monitoring time interval; The unit is configured to: compare the number of lost packets with the threshold of the number of allowed packet loss, and if the number of lost packets is greater than the threshold of the number of allowed packets, report the alarm information, where the alarm information includes: And monitoring the number of packet loss and the corresponding optical network unit interface information in the time period of the monitoring time interval of the multicast service flow.  13. The optical network unit of claim 12, wherein  The statistic subunit is further configured to: after receiving the number of packets of the monitored multicast service flow within a period of the monitoring time interval, discarding the monitoring multicast service flow.