KR20050070540A - Apparatus and method for guarantee the quality of service in optical subscriber network - Google Patents

Abstract

The present invention provides an apparatus and method for guaranteeing the quality of service (QoS) of a service requiring high quality such as multimedia in an optical subscriber network system. The present invention for the optical subscriber network system for guaranteeing QoS is located between the service provider for providing a multimedia service, and the service provider and the user terminal, and receives the service request from the user terminal to the service provider And a proxy user for requesting a service and transmitting the multimedia stream provided by the service provider to the user terminal, and a user terminal provided with the service from the proxy user.

Description

APPARATUS AND METHOD FOR GUARANTEE THE QUALITY OF SERVICE IN OPTICAL SUBSCRIBER NETWORK}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical subscriber network system supporting integrated broadcasting and communication services using an FTTH (Fiber To The Home) network. It relates to an apparatus and a method for guaranteeing.

1 is a block diagram illustrating a general optical subscriber network configuration. As shown in FIG. 1, an optical subscriber network for providing a broadcast / communication service converts broadcast data received from a service provider 100, which is a broadcaster, to provide a broadcast service to a subscriber, and then converts one optical Optical network unit (ONU) 120, which is a user-side device that transmits information received from an optical line terminal (OLT) 110, which is bundled with a signal, to a subscriber, and an optical cable connecting the OLT 110 and ONU 120. It is composed. When the broadcast / communication data transmitted from the service provider 100, which is a broadcaster, is transmitted to the ONU 120 via the OLT 110, the ONU 120 receives a service request from the user terminal 130, which is the terminal of the service user. To provide that service.

Referring to FIG. 2, FIG. 2 is a diagram illustrating a process of transmitting data to a user by a service provider in a conventional optical subscriber network system. If the user terminal 202 requests the service to the service provider 200 in step 204, the service provider 200 responds to the service request in step 206. In operation 208, the service provider 200 provides the data service to the user terminal 202 according to the priority.

In the optical subscriber network as described above, when transmitting optical signals to the home, continuous digital broadcasting or VOD signals are transmitted to the subscriber in one direction, and bursted Ethernet communication signals are transmitted and received in bursts. Because of this directionality and continuity, it is difficult to transmit two signals together, so that broadcast signals of multiple channels are summed into TDM and then assigned to one optical wavelength, and Ethernet communication signals are assigned to another optical signal wavelength. The FTTH network system using Division Multiplexing) is implemented. Since the Internet service through such Ethernet communication cannot guarantee the QoS, the Internet has been recognized as a limitation in pursuing a higher value-added service. Recently, many efforts have been made to solve this problem. Basically, the priority of data is indicated in the protocol header, and each network device performs priority queuing based on the indicated priority. On the other hand, in the case of a multimedia service through a network, QoS refers to characteristics such as delay and loss in the network, as well as jitter and wonder of the stream when the service is a multimedia stream. This includes up to higher concepts such as response characteristics, image quality, and sound quality.

However, the current Internet service can only guarantee the quality at the network level by using the priority queuing method using the priority indicated in the data to guarantee the QoS, and cannot guarantee the higher quality. In other words, in the case of Internet service, real-time transmission may be required depending on the type of content. In the network, even if the data delay and loss is compensated, the media itself cannot be compensated. In particular, in the case of multimedia coding method such as MPEG (Moving Picture Experts Group) data, continuity of data is important. However, even if priority management is carried out through a packet network, the quality degradation caused by packetizing data cannot be avoided. . Since the degradation of the quality cannot be corrected by the network device, the subscriber device must be compensated separately. Even if the correction is successful, a functional burden of the subscriber device is generated, and usually another quality deterioration occurs. For example, when MPEG-2 is received over an IP (internet protocol) network, the MPEG-2 program clock reference (PCR) is properly compensated to compensate for the discontinuity caused by the IP packet, or the receiver has sufficient buffer to Discontinuities should be removed. The first method has a high functional burden, and the second method, which is more practical, is simple, but it may be a problem in the case of real-time broadcasting because the initial delay over a certain time cannot be avoided depending on the buffer size.

As described above, in the case of the optical subscriber network system, since there is a separate real-time channel having a certain delay characteristic, it is possible to avoid the deterioration of the quality as described above, so that the QoS can be strictly guaranteed. There was a need for a method for screening data for transmission.

Accordingly, an object of the present invention is to provide an apparatus and method for guaranteeing a quality of service (QoS) of a service requiring high quality such as multimedia in an optical subscriber network system.

The present invention for achieving the above object is in the optical subscriber network system for guaranteeing the QoS, the service provider for providing a multimedia service, located between the service provider and the user terminal, and receives a service request from the user terminal And a proxy user for requesting the received service from the service provider and transmitting the multimedia stream provided by the service provider to the user terminal, and a user terminal provided with the service from the proxy user.

The present invention for achieving the above object is a method for compensating QoS in an optical subscriber network system having a service provider for providing a multimedia service, and a user terminal provided with the service, between the service provider and the user terminal; Location, and having a proxy user; receiving, by the proxy user, a service request from the user terminal; requesting the received service to the service provider; and providing the service user with the service provider. Characterized in that the process of transmitting the multimedia stream to the user terminal.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In describing the present invention, if it is determined that the detailed description of the related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

3 is a diagram illustrating an optical subscriber network system for guaranteeing QoS according to an embodiment of the present invention.

An optical subscriber network system for guaranteeing QoS includes a service provider 300 that provides a multimedia service and a proxy user that is a network virtual terminal in which a multimedia stream provided by the service provider 300 matches a real-time channel. An OLT 310 including a 340, an optical network unit 320, which is a user-side device that transmits information received from an optical line terminal 310, which is bundled into one optical signal, to a subscriber, and an OLT. An optical cable connecting the 110 and the ONU 120 and a user terminal provided with a service are provided. In particular, the proxy user 340, which is a network virtual terminal in which the multimedia stream is matched to the real time channel, receives a service from the service provider 300 instead of the user terminal 330 and transmits the service to the user terminal through the real time channel.

Then, the fault for the user terminal 300 to receive the multimedia service in the optical subscriber network system configured as shown in FIG. 3 will be described with reference to FIG. 4. FIG. 4 is a diagram illustrating a process of transmitting data to a user by a service provider in an optical subscriber network system for guaranteeing QoS according to an exemplary embodiment of the present invention.

First, in step 406, the user terminal 330 requests the proxy user 340, which is a network terminal, to relay a service request for high quality service. The proxy user 340, which has received this, sets up a real-time channel with the user terminal 300 in step 408. Thereafter, the proxy user 340 requests a service from the service provider 300. The service provider 300 receiving the service request transmits a response to the service request to the proxy user 340, and transmits the data of the requested service to the proxy user 340 in step 414. Thereafter, the proxy user 340 matches data to a preset real-time channel. In this case, an appropriate correction may be applied to the multimedia stream for the purpose of removing jitter. The user terminal 330 may use a service of reliable quality through a preset real-time channel.

In addition, when the user terminal 300 requests the proxy user 340 to relay service control in the above manner, the proxy user 340 applies an appropriate priority policy according to the network to the service provider 300. Send control information.

In the entire process of steps 406 to 416, the service provider 300 does not know the existence of the user terminal 330 and provides a service to the proxy user 340, which is a virtual terminal. In such a case, the service provider 300 and the proxy user 340 can ensure the maximum QoS level achievable by the network between both the up and down, and the proxy user 340 applies the appropriate correction to the quality. By restoring the transmission to the user terminal 330 to ensure the QoS.

As described above, the present invention enables the user terminal to receive data that compensates for QoS in the proxy user, thereby ensuring quality of service (QoS) of services requiring high quality such as multimedia in the optical subscriber network system.

Meanwhile, in the detailed description of the present invention, specific embodiments have been described, but various modifications are possible without departing from the scope of the present invention. For example, in the exemplary embodiment of the present invention, the proxy user is described to be included in the OLT, but the proxy user may be installed in the ONU of the optical subscriber network system. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined not only by the scope of the following claims, but also by the equivalents of the claims.

As described above, since the user terminal receives data that compensates for QoS in the proxy user, the present invention has the advantage of enabling high quality / high value added services by differentiating QoS of multimedia services. In addition, since the user receives the data whose quality has already been adjusted in the multimedia stage, the user terminal device can be simplified and implemented at low cost. In addition, since the uplink control signal can always be transmitted first, there is an advantage of ensuring a quick response.

1 is a diagram illustrating a general optical subscriber network system configuration;

2 is a diagram illustrating a process of transmitting data to a user by a service provider in a conventional optical subscriber network system;

3 is a diagram illustrating an optical subscriber network system for guaranteeing QoS according to an embodiment of the present invention;

4 is a diagram illustrating a process of transmitting data to a user by a service provider in an optical subscriber network system for guaranteeing QoS according to an embodiment of the present invention.

Claims (5)

In the optical subscriber network system to guarantee the QoS, A service provider for providing a multimedia service, A proxy user located between the service provider and the user terminal, receiving a service request from the user terminal, requesting the received service from the service provider, and transmitting a multimedia stream provided by the service provider to the user terminal; , And a user terminal provided with a service from the proxy user. 2. The method of claim 1, wherein the proxy user is a network virtual terminal, and receives a service from the service provider instead of the user terminal and transmits the multimedia stream to the user terminal through a real time channel. Device for. The apparatus of claim 1, wherein the proxy user transmits a multimedia stream provided by the service provider to the user terminal through a predetermined real time channel with the user terminal. A method for compensating QoS in an optical subscriber network system having a service provider for providing a multimedia service and a user terminal provided with the service, the method comprising: Located between the service provider and the user terminal, and having a proxy user, Receiving, by the proxy user, a service request from the user terminal and requesting the received service from the service provider; Transmitting, by the proxy user, the multimedia stream provided by the service provider to the user terminal. The method of claim 4, wherein the transmitting of the multimedia stream to the user terminal comprises: And the proxy user transmits a multimedia stream provided by the service provider to the user terminal through a predetermined real time channel with the user terminal.