KR100919055B1 - Passive Optical Network system providing high speed level IPTV service to low speed level subscriber - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a passive optical network (PON) system for efficiently providing a high speed IPTV service to a low speed subscriber, wherein an optical line termination (OLT) is a packet for broadcasting (IPTV). Shaping is processed for each IPTV channel in order to prevent burst occurring due to a transmission structure in which data and data packets are mixed down and transmitted, and an optical network termination (ONT) By outputting the packet for broadcasting (IPTV) and the packet for data (Data) through separate output ports, it is possible to efficiently provide a high-speed IPTV service to low-speed subscribers.

IPTV Service, PON, OLT, ONT, Burst, Shaping

Description

Passive Optical Network System providing high speed IPTV service to low speed level subscriber

The present invention relates to a passive optical network system for efficiently providing a high-speed IPTV service to low-speed subscribers, and more particularly, to an optical line termination (OLT) of a passive optical network (PON) and to a passive optical network system. The present invention relates to a packet processing technology of an optical network termination (ONT).

The ITU-T G.984 Working Group standardizes the Gigabit Passive Optical Network (GPON) standard to provide subscribers with broadband services and to efficiently provide communication, broadcasting and voice services through a single infrastructure. It was. The current standardized specification is able to provide downlink 2.5Gbps and uplink 1Gbps transmission bands.

However, in order to provide high quality IPTV broadcasting service and various multimedia services requiring high bandwidth in the future, the demand for the transmission bandwidth of 10 Gbps is increasing downward, and accordingly, the GPON for providing the transmission bandwidth of 10 Gbps in the G.984 working group is therefore required. Promoting the standardization of the structure.

High quality IPTV services require a transmission bandwidth of 20Mbps per channel. For fast channel selection, the channel of all IPTV services must be transmitted from the subscriber end device like the cable TV method, and channel selection must be made. Under these conditions, if 100 IPTV service channels are transmitted to the subscriber station, a transmission band of about 2 Gbps is required. Therefore, in order to transmit more IPTV service channels, a 10Gbps GPON technology capable of providing a 10Gbps transmission band is required.

Currently, optical network termination (ONT) uses subscriber ports of 1 Gbps to provide IPTV services to subscribers (IP set-top boxes). This is because the port cost is low, and at the same time, about 50 IPTV services can be delivered to the IP set top box.

Accordingly, there is a need for a method of efficiently mapping a high-speed IPTV service delivered at a transmission rate of 10 Gbps to a 10 Gbps GPON system to a low-speed subscriber end device of 1 Gbps. In addition, when the transmission is at a speed of 1Gbps or more due to the characteristics of the burst of the IPTV service processing method for this is required.

For this reason, the present inventors have studied passive optical network technology that can efficiently provide high-speed IPTV service to low-speed subscribers by preventing bursts occurring when providing high-speed IPTV service to low-speed subscribers. Was done.

The present invention has been invented in view of the above, and is a manual for efficiently providing a low speed subscriber with a high speed IPTV service that can prevent a burst occurring when a high speed IPTV service is provided to a low speed subscriber. It is an object of the present invention to provide an optical network system.

According to an aspect of the present invention for achieving the above object, an optical line terminal device (OLT) of a passive optical network system (PON) for efficiently providing a high-speed IPTV service to a low-speed subscriber according to the present invention is broadcasted It is characterized in that the shaping is performed for each IPTV channel in order to prevent a burst occurring due to a transmission structure in which a packet for (IPTV) and a packet for data are mixed and transmitted downward.

On the other hand, according to an additional aspect of the present invention, the optical network terminator (ONT) of the passive optical network system (PON) to provide a high-speed IPTV service to low-speed subscribers according to the present invention is a packet for broadcast (IPTV) And downlink data packets through a separate output port.

The present invention has a useful effect of efficiently providing a high speed IPTV service to a low speed subscriber by preventing a burst occurring when providing a high speed IPTV service to a low speed subscriber.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily understand and reproduce the present invention.

1 is a schematic diagram of an IPTV service in a passive optical network (PON) system. The optical line terminal (OLT) 100 provides a high speed IPTV service such as a 10 Gbps transmission band to the backbone network 300 and the PON link 400.

Typically, IPTV services are provided in two ways. The first method is to separate the port for broadcasting (IPTV) and data (Data) in the optical line terminal (OLT) 100, and the packets input through the port for broadcasting (IPTV) in the PON link 400 It is an overlay method that transmits through a separate wavelength. This has the advantage of using a single PON link 400, but is inefficient because additional IPTV devices are additionally required.

In the second method, the optical line terminal (OLT) 100 converts a packet for broadcasting (IPTV) and data (Data), which are mixed and transmitted from a backbone network, into a Globally Executable MHP (GEM) frame for GPON, and then terminates the optical network. The GEM having the registered port identification information (Port-ID) is transmitted to the device (ONT) 200, and whether the optical network termination device (ONT) 200 is a packet for broadcasting (IPTV) or a packet for data. Only frames are sent to the subscriber port and the rest are discarded. The GEM frame transmitted to the subscriber end port is converted into an Ethernet frame and output.

In this transmission method, all broadcast (IPTV) channels are transmitted through the subscriber port, and the broadcast set is separated from the IP set-top box. In this method, if a certain broadcast (IPTV) channel has a burst characteristic and is transmitted over a specific transmission band, this traffic is lost at the subscriber port and service is normally performed. It becomes impossible. In addition, since a broadcast (IPTV) packet and a data (Data) packet are output together through a single port, they interfere with each other.

Therefore, the optical line terminal (OLT) 100 performs a shaping function on the IPTV channels so that the bandwidth of the specific IPTV service does not exceed the specific transmission band at any moment, thereby reducing the speed of the high-speed IPTV service. The present invention proposes a passive optical network (PON) structure that can prevent the occurrence of bursts when providing to subscribers.

In addition, by allowing the optical network terminator (ONT) 200 to output a broadcast (IPTV) packet and a data (Data) packet through separate ports, it is possible to more efficiently provide a high speed IPTV service to a low speed subscriber. A passive optical network (PON) architecture is proposed.

2 is a schematic diagram of a downlink IPTV service of a passive optical network system for efficiently providing a high speed IPTV service to a low speed subscriber according to the present invention. FIG. 3 is a high speed IPTV service according to the present invention to a low speed subscriber. Uplink IPTV Service Schematic of Passive Optical Network System for Efficiently Providing FIG. 4 shows an optical network terminator (ONT) of a passive optical network system for efficiently providing a high speed IPTV service to a low speed subscriber according to the present invention. A block diagram according to one embodiment.

As shown in the figure, a passive optical network (PON) system includes an optical line termination device (OLT) 100 and a plurality of optical network termination devices (ONTs) 200 linked thereto. It is made to include.

In the optical line terminal (OLT) 100 of the passive optical network system for efficiently providing a high speed IPTV service to a low speed subscriber according to the present invention, a packet for broadcasting (IPTV) and a packet for data are mixed. The shaping process is performed for each IPTV channel in order to prevent the burst occurring due to the transmission structure transmitted downward.

At this time, the shaping process buffers the packet for each IPTV channel using a frame buffer and adjusts the output bandwidth to a promised size so that the transmission band of the specific IPTV service does not exceed the specific transmission band. This prevents bursts that occur when providing high-speed IPTV service to low-speed subscribers.

For example, when providing a 10Gbps high-speed IPTV service to a 1Gbps low-speed subscriber, the optical line terminal (OLT) 100 adjusts the transmission band and outputs a high-speed IPTV service through shaping processing. Prevents bursts occurring at the time of provision to low speed subscribers.

If the optical line terminal (OLT) 100 adjusts the transmission bandwidth through shaping so as not to exceed 20Mbps bandwidth per IPTV channel, it can provide about 500 channel services for a high-speed IPTV service of 10Gbps. In other words, it means that an optical network terminator (ONT) provides IPTV service through a low speed subscriber port such as 1 Gbps.

(Downlink packet processing)

Meanwhile, according to an additional aspect of the present invention, the optical network terminator (ONT) 200 is implemented to output down through the separate output port for the packet for broadcasting (IPTV) and the data (Data), respectively more efficient As a result, high-speed IPTV services can be efficiently provided to low-speed subscribers.

In detail, the optical network terminator (ONT) 200 includes a broadcasting table 210, a data table 220, a determination unit 230, and a downlink packet processor 240.

The broadcast table 210 stores port identification information (Port-ID) for broadcast (IPTV) for managing packets for broadcast (IPTV). The data table 220 stores port identification information (Port-ID) for data for managing the data packet. For example, if a packet is processed in a GEM (Globally Executable MHP) frame, the port identification information becomes a GEM Port-ID.

At this time, the format of the broadcast (IPTV) packet and the data (Data) packet are the same. Only the difference between the two packets is determined by the IPTV service provider including the port identification information (Port-ID) and whether it is a packet for broadcast (IPTV) or a data (Data) packet.

The determination unit 230 determines whether the packet transmitted downward is a packet for broadcast (IPTV) or a data (Data) packet by referring to the broadcast table 210 and the data table 220. That is, the broadcasting table and the data table are for port data (Port-ID) for broadcasting (IPTV) and data (Data) for managing packets for data. Port-ID information is stored, so it is possible to know whether the packet is for broadcast (IPTV) or data (Data) by comparing the stored information with the transmitted port-identity information (Port-ID) included in the packet. do.

The downlink packet processor 240 outputs through the first output port when it is determined by the determination unit 230 that the packet is for broadcast (IPTV), and outputs a second packet when it is determined that the packet is for data. Output through the port.

At this time, when the packet is not registered in either the broadcast table or the data table, the downlink packet processor 240 filters the packet and discards the packet without transmitting it to the subscriber.

That is, the optical network terminator (ONT) 200 receives packets of all IPTV channels from the optical line terminal apparatus (OLT) 100 and registers among them by referring to the broadcasting table 210 and the data table 220. Only the packet having the port identification information (Port-ID) for broadcast (IPTV) is detected through the determination unit 230, and has the port identification information (Port-ID) for broadcasting (IPTV) through the first output port. Only packets are sent to subscriber IP set-top boxes.

That is, the optical network terminator (ONT) 200 outputs the packet for broadcasting (IPTV) and the packet for data (Data) downward through separate output ports, respectively, for the packet for broadcasting (IPTV) and the packet for data (Data). Each of them is independently output to the subscriber IP set-top box without mutual interference, and by separately managing only the packets for broadcasting (IPTV), it is possible to efficiently provide high-speed IPTV services to low-speed subscribers.

For example, if the shaping process is performed by the optical line terminal (OLT) 100 so as not to exceed 20 Mbps bandwidth per IPTV channel, the optical network terminator (ONT) 200 may not exceed 50 Gbps, which is a transmission band of a low-speed subscriber, at most 50. Port IDs for broadcasting (IPTV) can be managed through the broadcasting table. By doing so, the ONT 200 can provide IPTV service at up to 1 Gbps to an IP set-top box at the subscriber side without generating a burst.

On the other hand, when managing 50 port identification information (Port-ID) for the broadcast (IPTV) through the broadcast table 210, the port identification information for the broadcast (IPTV) of the 50 favorite channels that subscribers enjoy If ID) is managed through the broadcast table, the subscriber can quickly select a channel.

And, if the subscriber applies for registration of a new channel, deletes the port identification information (Port-ID) for the broadcast (IPTV) of the channel that has not been viewed for a long time among the subscriber preferred channels managed through the broadcasting table 210 and broadcasts the new channel. If the port identification information (Port-ID) for (IPTV) is stored in the broadcast table 210, a more useful IPTV service can be achieved.

To this end, the optical network termination device (ONT) 200 may further include a table updater 250. The table updater 250 updates the broadcast table 210 or the data table 220. The process of updating the broadcast table 210 or the data table 220 will be described in detail later.

(Upstream Packet Processing)

On the other hand, according to an additional aspect of the present invention, the optical network termination device (ONT) 200 receives the uplink (IPTV) packet and the data (Data) packet through a separate input port, respectively. Specifically, the optical network terminator (ONT) 200 further includes a first transport container (T-CONT: Transmisssion Container) 260, a second transport container 270, and an uplink packet processor 280. .

The first transport container 260 stores a packet for broadcast (IPTV) input through a first input port. The second transport container 270 stores a packet for data input through a second input port. For example, a packet for broadcast (IPTV) input through the first input port may be a packet for channel change request.

In this case, the second transport container 270 may be configured in plural so as to provide a differentiated data service. In this case, the division of the second transport container for each service may be determined through priority information of the packet transmitted from the subscriber.

The uplink packet processor 280 processes the packet stored in the first transport container 260 or the second transport container 270 and transmits the packet upward. In this case, the uplink packet processing unit 280 converts the MAC frame stored in the first transport container 260 into a transport protocol scheme, for example, a GEM scheme frame, and a destination IP in the converted frame. The uplink transmission includes port identification information (Port-ID) assigned to the address.

To this end, the optical fiber terminator (ONT) 200 must have a broadcast port identification information (Port-ID) for the IPTV channel, and the broadcast port identification information (Port-ID) mapped to the destination (Destination) IP address It must be stored as an internal table.

Alternatively, one broadcast port identification information (Port-ID) used exclusively for broadcasting may be included in the MAC frame input through the first input port and transmitted. In this case, there is no need for an internal table in which a destination IP address and a broadcast port ID are mapped.

The optical line terminal (OLT) 100 allocates transmission bands for the first transport container 260 and the second transport container 270 through dynamic bandwidth allocation (DBA).

By doing so, the optical network terminator (ONT) 200 receives the broadcast (IPTV) packet and the data (Data) packet which are transmitted on the uplink through different input ports, thereby receiving the broadcast (IPTV) packet and data (Data). ) Mutual interference of packets does not occur.

Referring to FIG. 5, a broadcast (IPTV) table update procedure of a passive optical network system for efficiently providing a high speed IPTV service according to the present invention having the above-described configuration to a low speed subscriber will be described.

In order to register a new IPTV channel, the optical line terminal (OLT) 100 transmits a channel registration request message (Configure-Port-ID PLOAM) to the optical network terminator (ONT) 200 in step S110. At this time, the channel registration request message includes a source IP address of a newly registered IPTV channel and port identification information (Port-ID) assigned thereto.

Upon receiving the channel registration request message (Configure-Port-ID PLOAM), the optical network terminator (ONT) 200 receives the source IP address and port identification information (Port-ID) included in the channel registration request message in step S120. ) Is updated in the broadcast (IPTV) table according to the new channel registration by storing the) in the broadcast (IPTV) table.

The IPTV service input to the optical line terminal (OLT) 100 is transmitted downward to the optical network terminator (ONT) 200, and is identified by the broadcast port identification information (Port-ID) of the broadcasting (IPTV) table. Served as a subscriber IP set-top box.

In order to change the IPTV channel, a channel change request message (IGMP Join) is transmitted upward from the subscriber IP set-top box to the optical network terminator (ONT) 200 in step S210. The channel change request message (IGMP Join) includes port identification information (Port-ID) assigned to a destination IP address.

Then, the optical network terminator (ONT) 200 in step S220 to store the broadcast port identification information (Port-ID) for the channel requested by the subscriber in place of the most recently used broadcast port identification information (Port-ID) As a result, the broadcast (IPTV) table is updated according to the change of the IPTV channel.

As described above, the present invention provides an instant burst due to a transmission structure in which an optical line termination (OLT) is transmitted downward by mixing a packet for broadcasting (IPTV) and a packet for data (Data). Shaping is processed for each IPTV channel to prevent occurrence, and Optical Network Termination (ONT) outputs downlink packets for broadcasting (IPTV) and packets for data through separate output ports. By doing so, it is possible to efficiently provide a high-speed IPTV service to a low-speed subscriber, thereby achieving the above object of the present invention.

While the invention has been described with reference to the preferred embodiments, which are referred to by the accompanying drawings, it is apparent that various modifications are possible without departing from the scope of the invention within the scope covered by the following claims from this description. .

The present invention can be used industrially in the field of packet processing or application thereof of the optical line terminal (OLT) of the passive optical network (PON) and the optical network termination device (ONT) interlocked thereto.

1 is a schematic diagram of an IPTV service in a passive optical network (PON) system;

2 is a schematic diagram of a downlink IPTV service of a passive optical network system for efficiently providing a high speed IPTV service to a low speed subscriber according to the present invention;

3 is a schematic diagram of an uplink IPTV service of a passive optical network system for efficiently providing a high speed IPTV service to a low speed subscriber according to the present invention;

4 is a block diagram according to an embodiment of an optical network terminator (ONT) of a passive optical network system for efficiently providing a high speed IPTV service to a low speed subscriber according to the present invention.

5 is a flowchart illustrating a broadcast table update procedure of a passive optical network system for efficiently providing a high speed IPTV service to a low speed subscriber according to the present invention.

<Explanation of symbols for main parts of the drawings>

100: optical line terminal device (OLT) 200: optical network terminal device (ONT)

210: broadcast table 220: data table

230: determination unit 240: downlink packet processing unit

250: table updating unit 260: first transport container

270: second transport container 280: uplink packet processing unit

300: backbone network 400: PON link

Claims (10)

In a passive optical network (PON) system including an optical line termination (OLT) and a plurality of optical network terminations (ONT) linked thereto, The optical line terminal device (OLT) is: In order to prevent burst occurring due to a transmission structure in which a packet for broadcasting (IPTV) and a packet for data are mixed and transmitted downward, shaping is performed for each IPTV channel. Passive optical network system for efficiently providing IPTV services to low-speed subscribers. The method of claim 1, The shaping process is: Passive optical for efficiently providing high-speed IPTV service to low-speed subscribers, which is characterized by buffering packets for each IPTV channel using a frame buffer and adjusting the output bandwidth to a promised size. Network system. The method according to claim 1 or 2, The optical network terminator (ONT) is: Passive optical network system for efficiently providing a high-speed IPTV service to low-speed subscribers, characterized in that the output packet for broadcasting (IPTV) and data (Data) packet down through a separate output port. The method of claim 3, wherein The optical network terminator (ONT) is: A broadcast table for managing packets for broadcast (IPTV); A data table for managing packets for data; A determination unit for determining whether the downlink transmitted packet is a packet for broadcast (IPTV) or a data (Data) with reference to the broadcast table and the data table; A downlink packet processor for outputting through the first output port if it is determined that the packet is for broadcasting (IPTV) and outputting through the second output port if it is determined that the packet is for data; Passive optical network system for efficiently providing a high-speed IPTV service to a low-speed subscriber comprising a. The method of claim 4, wherein The downlink packet processing unit: As a result of the determination by the determination unit, in the case of a packet not registered in the broadcast table or the data table, the packet is filtered. The passive optical network for efficiently providing a high speed IPTV service to a low speed subscriber system. The method of claim 4, wherein The optical network terminator (ONT) is: A table updater for updating the broadcast table or the data table; Passive optical network system for efficiently providing a high-speed IPTV service to a low-speed subscriber, characterized in that it further comprises. The method of claim 3, wherein The optical network terminator (ONT) is: Passive optical network system for efficiently providing a high-speed IPTV service to a low-speed subscriber, characterized in that up to receive a packet for broadcasting (IPTV) and data (Data) through a separate input port. The method of claim 7, wherein The optical network terminator (ONT) is: A first transmission container (T-CONT: Transmisssion Container) for storing a packet for broadcast (IPTV) input through the first input port; A second transport container configured to store a packet for data input through the second input port; An uplink packet processor for processing a packet stored in the first transport container or the second transport container and forwarding the packet upward; Passive optical network system for efficiently providing a high-speed IPTV service to a low-speed subscriber comprising a. The method of claim 8, The uplink packet processing unit: The MAC frame stored in the first transport container is converted into a frame of a transport protocol method, and the uplink transmission is included in the converted frame by including broadcast port identification information (Port-ID) assigned to a destination IP address. A passive optical network system for efficiently providing a high speed IPTV service to a low speed subscriber, characterized in that. The method of claim 8, A packet for broadcast (IPTV) input through the first input port is: A passive optical network system for efficiently providing a high speed IPTV service to a low speed subscriber, characterized in that the packet is a channel change request packet.

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