KR100763525B1 - Method for managing service bandwidth by customer port and EPON System using the same - Google Patents

Abstract

The present invention relates to a service bandwidth management method for each subscriber capable of controlling various service bandwidths for each subscriber and service, and an Ethernet-based passive optical network (EPON) system using the same. Assigns a subscriber identifier (Customer Identifier) for each subscriber, and assigns a Service Identifier and a Service Priority for each type of service provided to the subscriber, the subscriber identifier, the service identifier, and Bandwidth can be managed for each type of service provided to a subscriber by a combination of service priorities.

Optical, class of service, identifier, subscribed port, ONU, OLT, EPON

Description

Subscriber service bandwidth management method and Ethernet-based passive optical subscriber network system using the same {Method for managing service bandwidth by customer port and EPON System using the same}

1 is a schematic view showing the configuration of a general EPON system.

2 is a flowchart illustrating a service bandwidth management method for each subscriber according to the present invention.

3 is a block diagram of an Ethernet-based passive optical subscriber network system according to a preferred embodiment of the present invention.

4 is a detailed flowchart illustrating a subscriber identifier assignment process in an optical network termination apparatus according to the present invention.

5 is a detailed flowchart illustrating a subscriber identifier assignment process in the optical line termination apparatus according to the present invention.

6 is a flowchart illustrating a service identifier assignment process in the optical line termination apparatus according to the present invention.

7 is a flowchart illustrating a service identifier assignment process in an optical network end device according to the present invention.

8 is a flowchart illustrating a bandwidth control process for each service class in the optical line termination apparatus according to the present invention.

9 is a flowchart illustrating a bandwidth control process for each service class in the optical network termination apparatus according to the present invention.

10 is a diagram illustrating a general Ethernet frame structure.

* Brief description of symbols for the main parts of the drawings *

100: optical line terminator (OLT) 200: system administrator

300: optical network termination unit (ONU / ONT) 101, 301: link control unit

102 and 302: service identification tag removing unit 103: subscriber information extracting unit

104, 303: subscriber identification tag removal unit 105: subscriber information lookup table

106, 304: bandwidth controller 107, 305: service classification unit

108, 306: service identification tag insertion unit 109,307: subscriber identification tag insertion unit

The present invention relates to an Ethernet-based passive optical subscriber network (hereinafter referred to as an EPON), and more specifically, to service bandwidth management for each subscriber port, which enables various bandwidth control for a service provided through an EPON system. The present invention relates to an Ethernet-based passive optical subscriber network system using the same.

Passive Optical Network (PON) technology is in the spotlight as a next-generation subscriber network technology for providing convergence services of FTTH (Fiber To the Home) and communication and broadcasting. PON technology, which has strength in broadband service that accepts voice, data, and broadcasting in the subscriber network, which has been pointed out as a bottleneck, will also contribute to the construction and activation of the digital home. In particular, the standardization trend of the Ethernet-based Passive Ethernet PON (EPON), which accounts for 95% of the Internet traffic, the technical characteristics and economics of EPON, and the development status of the EPON system are as follows.

EPON is being standardized by the IEEE 802 LAN / MAN Standards Committee. Currently, three subscriber network technologies are determined: point-to-point copper cable, point-to-point fiber cable, and point-to-multipoint fiber cable. I am using a wired track. In the case of EPON, it has a transmission rate of 1 gigabit, a 1:16 branch rate, and a target transmission distance of 10/20 Km.

EPON uses a passive light splitter as a point-to-multipoint network structure. EPON is an inexpensive, easy-to-operate shared optical subscriber network that eliminates active devices such as regenerators and amplifiers in outdoor devices, minimizes the number of optical cables to be installed and reduces the number of optical ports in central offices. For new apartments with fiber optic cabling, EPON is an inexpensive FTTH or FTTB (Fiber To The Business) based subscriber network.

A general EPON system will be described with reference to the drawings.

1 is a schematic diagram of a general EPON system service providing form. Referring to FIG. 1, the EPON system connects an optical line terminal 10 (hereinafter referred to as 'OLT') 10 to a subscriber to a service provider or a network 11 to 1N used by the service provider. Optical network termination unit (hereinafter referred to as 'ONU') (31 to 3N). Among the ONUs, a single subscriber station device (Optical Network Terminal) (hereinafter referred to as 'ONT') 40 similar to an existing modem, rather than a plurality of subscribers, has the same concept as the ONU, but directly uses a service application terminal device used by the subscriber. It is also distinguished from ONU in that it provides a means of connection. In addition, the EPON system includes an apparatus (Optical Distribution Network, hereinafter referred to as 'ODN') 20 that separates one physical link so that a plurality of ONU / ONTs can be connected to one physical link provided by the OLT. do.

As shown in FIG. 1, the EPON system provides a means for logically distinguishing ONU / ONT (Logical Link Identifier: LLID hereinafter). More specifically, the ONU / ONTs 31 to 3N and 40 provide unique physical media information (hereinafter referred to as MAC addresses) to access the OLT 10, and the OLT 10 The MAC address of the ONU / ONT (31 to 3N, 40) is mapped to the LLID to provide a means for distinguishing the ONU / ONT (31 to 3N, 40). The OLT 10 provides a means for physically recognizing a device used by the service provider or another network device used by the service provider to access the OLT 10. In addition, the ONU / ONT (31 to 3N, 40) provides a means for physically recognizing the device used by the subscriber.

As shown in FIG. 1, a service provider providing a service through the EPON system provides a means for recognizing the type and characteristics of the provided service. That is, the service provider recognizes the type and characteristic of the service required from the service application terminal device used by the subscriber and serves to provide a corresponding service. EPON systems and service providers can set some rules for subscriber services and control and manage services that pass through the EPON system according to those rules.

EPON has limited bandwidth available for service delivery. We can't say that we have enough bandwidth to accommodate all these various services. Thus, a contract between the EPON system and the service provider and the subscriber should be able to control the bandwidth used for or to receive the service.

Conventional EPON focuses on the service itself rather than the subscriber connected to the ONU / ONT, and in terms of quality of service (hereinafter referred to as QoS), divides the service into multiple classes and bandwidth and transmission delays according to the class. There was a tendency to focus on controlling. However, as we have recently recognized that the bandwidth provided by EPON is very limited in accommodating a wide variety of services as much as possible, as described above, the service bandwidth used by a subscriber is not only determined by QoS but also by some subscriber-specific service policy. There is a need for control.

According to such a necessity, a method of prioritizing and serving a PON subscriber device is disclosed in Korean Patent Publication No. 2005-0061263.

In the foregoing patent application (Publication No. 2005-0061263), a service providing method and a PON system for a subscriber device having priority in a PON system are disclosed. In more detail, it is as follows. Priority is given to subscriber devices of the PON, and a reservation request message is received from the subscriber devices requesting band allocation for data transmission. Each received reservation request message is stored in each queue provided for each priority according to the priority of the subscriber device that transmitted the reservation request message, and then the priority request is stored from the reservation request message stored in the higher priority queue among the queues. Service is provided in order of reservation request message stored in low queue. As a result, priority may be given to a specific subscriber device to perform a differentiated subscriber service policy.

In addition, a method of identifying a subscriber using an IP address is disclosed in Korean Patent Publication No. 2005-0032687. The method includes assigning port-specific bandwidths and subscriber classes for a plurality of subscriber end devices connected to a service provider end device, allocating bandwidth for each subscriber port of the subscriber end device based on the bandwidth information; Allocating an IP address for each subscriber class of the subscriber end device based on the subscriber class information based on subscriber class information, and using the bandwidth and the IP address. It is implemented by the step of supporting the quality of service for each subscriber class for data transmission and reception between devices.

However, since the first prior patent classifies subscribers into ONU / ONT units only, there is a problem in that different types of bandwidth cannot be allocated, and the second prior patent must assign an IP address to distinguish the subscriber port. Whenever the IP address is dynamically assigned by DHCP, it is necessary to map the subscriber port and the IP address, check the subscriber port according to the mapped information, and check the service level of the identified subscriber port every time. .

The present invention has been proposed to solve the above-mentioned problems, and an object thereof is to provide a service bandwidth management method for each subscriber and an Ethernet-based passive optical subscriber using the same, which enables various bandwidth control for each service and a service for a service provided through a network. It is to provide a network system.

As a construction means for achieving the above object, the present invention comprises the steps of: assigning a subscriber identifier for distinguishing subscribers by subscribers; Allocating a service identifier for identifying a service for each service type; Classifying a service class indicating a class of a service by a combination of the assigned subscriber identifier and service identifier; And setting an allowable service bandwidth for each divided service class.

As another means for achieving the above object, the present invention provides a subscriber identification tag for finding a corresponding subscriber identifier among subscriber identifiers assigned for each subscriber and inserting it in the form of a subscriber identification tag for the uplink data packet to be transmitted to the optical line termination device. Insert; A service classification unit for classifying service types and characteristics to which the uplink data packet belongs and searching for a service identifier corresponding to the uplink data packet among service identifiers allocated for each service type; A service identification tag insertion unit for inserting a service identifier retrieved by the service classification unit into a service identification tag in the uplink data packet; A bandwidth controller for classifying a service class according to a subscriber identifier and a service identifier inserted into the uplink data packet and controlling a service bandwidth according to the classified service class; And a link control unit for transmitting an uplink data packet to an optical line termination device under the control of the bandwidth control unit.

In addition, the present invention is another configuration means for achieving the above object, the subscriber information lookup table for storing the subscriber identifier assigned for each MAC address which is the address of the physical medium connected to the optical network termination device; A subscriber identification tag inserting unit that finds a corresponding subscriber identifier in the subscriber information lookup table using a destination MAC address of a downlink data packet to be transmitted to an optical network termination device and inserts the corresponding subscriber identifier in the form of a subscriber identification tag in the downlink data packet; A service classification unit for classifying a service type to which the downlink data packet belongs among service identifiers allocated for each service type and providing a corresponding service identifier; A service identification tag insertion unit for inserting a service identifier provided by a service classification unit into a service identification tag in the downlink data packet; A bandwidth controller for checking a corresponding service class according to a combination of a service identifier and a subscriber identifier inserted into the downlink data packet, and controlling a service bandwidth according to the service class; And a link control unit for supporting an Ethernet-based packet transmission / reception with the subscriber end device and transmitting a corresponding downlink data packet to the subscriber end device under the control of the bandwidth control unit. Provide termination device.

In addition, the present invention as a configuration means for achieving the above object, the service class is assigned according to the combination of the subscriber and the service type and service priority information provided to the subscriber, and the bandwidth is allocated to each service class One or more optical network termination device for controlling the uplink bandwidth by service class; An optical line termination device for allocating a service class according to a combination of a subscriber receiving a service, a service type and service priority information provided to the subscriber, allocating bandwidth for each service class, and controlling downlink bandwidth for each service class; And a system manager which collects service provider information, service information provided by the service provider, subscriber information provided by the service provider, information for classifying services, and provides the optical network termination device and the optical line termination device to the optical network termination device. It provides a passive optical subscriber network system.

 Hereinafter, with reference to the accompanying drawings, it will be described in detail a preferred embodiment of the present invention. In the description of the embodiments, the same components are designated by the same reference numerals for the convenience of understanding.

2 is a flowchart illustrating a service bandwidth management method for each subscriber that can be applied to a network system such as an EPON system according to the present invention.

Referring to FIG. 2, the service bandwidth management method for each subscriber according to the present invention allocates a subscriber identifier for distinguishing subscribers for each subscriber (S10). In this case, the assignment of the subscriber identifier may be performed by one-to-one correspondence with the subscriber access port to which the subscriber side is connected in the case of ONU, thereby distinguishing subscribers by subscriber access port. Correspondingly, one subscriber identifier can be assigned. In the case of the OLT, since the subscriber access port information is not known, the MAC address of the physical medium delivered to the subscriber access port may be allocated in a one-to-one correspondence with the subscriber identifier.

In addition, the present invention allocates a service identifier for distinguishing a service for each service type (S20). The allocation of the service identifier is to collect information for identifying a service type for a data packet, classify a service type using this information, and then assign a unique service identifier for each classified service type. In this case, the information for identifying the service type for the packet may include one or more of a MAC address, an IP address, protocol information, priority information, and TCP / UDP port information. The method of assigning the service identifier is performed in the same manner in the OLT and the ONU. In addition, the present invention may further allocate a service priority for classifying service characteristics by service type together with a service identifier for more various bandwidth control (S30). The service priority may maintain the priority information included in the information for distinguishing the service type of the data packet from the collected information, or may assign a new priority for each classified service type.

As described above, when a subscriber identifier, a service identifier, and a service priority are allocated, a service class is set for each combination of the assigned subscriber identifier, the service identifier, and the service priority (S40).

After setting an allowable service bandwidth for each of the set service classes, the bandwidth of each service class is controlled to be within the set bandwidth (S50 and S60).

In step S50, the allowable service bandwidth corresponds to the bandwidth contracted between the service subscriber and the service provider for the service.

In addition, in step S60, in order to control bandwidth for each service class, a bandwidth control parameter may be set for each service class and bandwidth control may be performed using the same. In the above description, the control parameter related to the bandwidth control includes one or more of information on bandwidth measurement processing for each service class, allowable bandwidth set for each service class, and bandwidth information measured for each service class. When a packet of is inputted, the bandwidth information measured before the packet to execute the bandwidth control is compared with the allowable bandwidth corresponding to the service class of the corresponding data packet, so that the previously measured bandwidth information is received. If the bandwidth is exceeded, the corresponding data packet is dropped. If the previously measured bandwidth information does not exceed the allowable bandwidth, the data packet is normally processed to be transmitted.

In addition, in step S60, a queue buffer is provided for each combination of the subscriber identifier and the service priority for bandwidth control, and then the data packet is queued according to the combination of the subscriber identifier and the service priority of the corresponding data packet. By storing them in a buffer and scheduling the queue buffers according to their respective service priorities, the service bandwidth in the EPON system can be variously controlled.

Hereinafter, a bandwidth management process in the EPON will be described in more detail with reference to a detailed configuration of the EPON system and an operation flowchart thereof according to the above-described method.

3 is a block diagram of an EPON system for managing a service bandwidth for each subscriber port according to an exemplary embodiment of the present invention. Referring to FIG. 3, the EPON system according to the present invention includes an optical line terminal (OLT: 100), an optical network terminal (Optical Network Unit / Optical Network Terminal) 300, and a system manager 200. It includes. The ONU and ONT are simply classified according to whether they provide a connection means for a subscriber application device, which will be collectively referred to as ONU for convenience of description.

The OLT 100 may include an EPON link control unit 101, a service identification tag detaching unit 102, a customer information learning unit 103, and a subscriber identification tag removal. (Customer Identification Tag Detagging) unit 104, Customer Information Lookup table 105, Bandwidth Control unit 106, Service Classification unit 107, Service Identification Tag A service identification tag tagging unit 108 and a customer identification tag tagging unit 109 are included.

The ONU 300 may include an EPON link controller 301, a service identification tag removal unit 302, a subscriber identification tag removal unit 303, a bandwidth control unit 304, a service classification unit 305, and a service identification tag insertion unit ( 306, subscriber identification tag insertion unit 307.

The predetermined customer identification tag according to the present invention includes predetermined customer identifier information classified by subscribers, and the service identification tag includes a service identifier classified by service type and characteristics. Include.

The detailed function of the EPON system according to the present invention will be described in detail as follows.

When the packet is transmitted through a subscriber access port (not shown) provided by the ONU, the subscriber identification tag inserting unit 307 of the ONU 300 refers to a mapping table as shown in Table 1 to the subscriber access port to which the packet enters. The corresponding subscriber identifier is found and inserted into the packet in the form of a subscriber identification tag.

Subscriber Access Port Subscriber identifier

The service classification unit 305 extracts various communication protocol information and subscriber identifiers from the packet in which the subscriber identification tag is inserted by the subscriber identification tag inserting unit 307, and extracts the service by referring to a mapping table as shown in Table 2 below. Analyzed various communication protocol information and finds a match with various communication protocol preset information and subscriber identifier of the mapping table, finds a corresponding service identifier and service priority, and transmits the same to the service identification tag inserter 306.

Communication protocol preset information Subscriber identifier Service identifier Service priority

The service identification tag inserting unit 306 inserts the service identifier and service priority delivered from the service classification unit 305 into the packet in which the subscriber identification tag is inserted by the subscriber identification tag inserting unit 307 in the form of a service identification tag. do.

The bandwidth controller 304 is configured to insert the subscriber identification tag by the subscriber identification tag inserter 307 and the service identifier tag and the service priority in the packet in which the service identification tag is inserted by the service identification tag inserter 306. The information is extracted and a service class corresponding to the extracted information is found by referring to the mapping table in the form shown in Table 3.

Subscriber identifier Service identifier Service priority Service class

The bandwidth controller 304 compares the bandwidth information measured before the packet is delivered with the allowable bandwidth information by using the bandwidth control parameter corresponding to the service class with reference to the mapping table of the form as shown in Table 4. If the value exceeds the allowable value, the packet is dropped. If the value does not exceed the allowable value, the packet is passed.

Service class Bandwidth control parameters

In addition, the bandwidth control unit 304 measures the bandwidth for each of the service classes at predetermined intervals set in the bandwidth control parameter. The bandwidth measurement is performed in the form of calculating the number of packets that are passed per unit time, the number of bytes for a packet that is passed per unit time, or the number of bits for a packet that is passed per unit time. As described above, the bandwidth information measured for the class is preferably updated before a new packet is delivered.

In addition, the bandwidth controller 304 stores the undropped packet in a corresponding queue buffer among a plurality of queue buffers classified by a combination of a subscriber identifier and a service priority related to the packet according to a mapping table of a type as shown in Table 5 below.

Subscriber identifier Service priority Queue buffer

Subsequently, the bandwidth controller 304 schedules the queue buffers according to the service priority information according to the service priority of the service for the subscriber according to the subscriber identifier to transmit the packet to the EPON.

The link control unit 301 transfers the packet transmitted from the bandwidth control unit 304 to the link control unit 101 of the OLT 100 through the EPON.

The link control unit 101 of the OLT 100 receives a packet from the link control unit 301 of the ONU 300 and transmits the packet to the service identification tag removing unit 102.

The service identification tag removal unit 102 removes the service identification tag inserted by the service identification tag insertion unit 306 of the ONU 300 from the packet transmitted through the link control unit 101.

In addition, the subscriber information extracting unit 103 of the OLT 100 transmits to the subscriber identification tag inserting unit 307 of the ONU 300 in the packet from which the service identification tag is removed by the service identification tag removing unit 102. And extracts the MAC address (Source MAC Address of the packet) associated with the subscriber terminal device and the service application terminal device which generated the packet, and transfers it to the subscriber information lookup table 105.

The subscriber information lookup table 105 stores a subscriber identifier and a MAC address delivered from the subscriber information extracting unit 103 in a mapping table as shown in Table 6 below.

MAC address Subscriber identifier

Subsequently, the subscriber identification tag removing unit 104 inserts the subscriber identification tag inserted by the subscriber identification tag inserting unit 307 of the ONU 300 in the packet from which the service identifier has been removed by the service identification tag removing unit 102. Remove it.

The packet from which the service identification tag is removed by the service identification tag removal unit 102 and the subscriber identification tag is removed by the subscriber identification tag removal unit 104 is serviced through a service provider access port provided by the OLT 100. Output to the provider.

When the packet is delivered through the service provider access port provided by the OLT 100, the subscriber information lookup table 105 includes the MAC address associated with the subscriber station device or the service application terminal device (the destination MAC of the delivered packet). Address) information is extracted, the subscriber identifier corresponding to the extracted MAC address is found, and the subscriber identifier is transmitted to the subscriber identification tag inserting unit 109.

When the packet is transmitted through the service provider access port provided by the OLT 100, the subscriber identification tag inserting unit 109 subscribes the subscriber identifier associated with the packet transmitted from the subscriber information lookup table 105 to the packet. Insert in the form of an identification tag.

The service classification unit 107 extracts various communication protocol information and subscriber identifiers from the packet in which the subscriber identification tag is inserted by the subscriber identification tag insertion unit 109, and refers to the mapping table as shown in Table 7 above. Analyzes the extracted various communication protocol information and finds a match with various communication protocol preset information and subscriber identifier of the mapping table, finds a corresponding service identifier and service priority, and delivers the same to the service identification tag inserting unit 108. .

Communication protocol preset information Subscriber identifier Service identifier Service priority

The service identification tag inserting unit 108 transmits the service identifier and service priority delivered from the service classification unit 107 to the packet in which the subscriber identification tag is inserted by the subscriber identification tag inserting unit 108 in the form of a service identification tag. Insert

Bandwidth control unit 106 is a subscriber identification tag inserted by the subscriber identification tag insertion unit 109 and the service identification tag inserted by the service identification tag insertion unit 108, the subscriber identifier, service identifier and service priority The rank information is extracted, and a service class corresponding to the extracted information is found by referring to the mapping table as shown in Table 8.

Subscriber identifier Service identifier Service priority Service class

The bandwidth controller 106 compares the bandwidth information measured before the packet is delivered with the allowable bandwidth information by using a bandwidth control parameter corresponding to the service class with reference to a mapping table of a form as shown in Table 9, If the value exceeds the allowable value, the packet is dropped. If the value does not exceed the allowable value, the packet is passed.

Service class Bandwidth control parameters

The bandwidth control unit 106 measures the bandwidth for each service class at predetermined intervals set in the bandwidth control parameter. The bandwidth measurement is performed in the form of calculating the number of packets that are passed per unit time, the number of bytes for a packet that is passed per unit time, or the number of bits for a packet that is passed per unit time. The bandwidth information measured for the class of service is updated before a new packet is delivered.

The bandwidth controller 106 stores the undropped packet in a corresponding queue buffer corresponding to the subscriber identifier associated with the packet and the service priority according to the mapping relationship of the subscriber identifier field, service priority field, and queue buffer field. .

In addition, the bandwidth controller 106 schedules the queue buffers according to the service priority information for each service priority of the service of the subscriber according to the subscriber identifier.

The EPON link control unit 101 transfers the packet transmitted from the bandwidth control unit 106 to the ONU 300 side.

The link control unit 301 of the ONU 300 transfers the packet transmitted from the OLT 100 to the service identification tag removing unit 302 as described above.

The service identification tag removal unit 302 removes the service identification tag inserted by the service identification tag insertion unit 108 from the packet transmitted through the link control unit 301, and then the subscriber identification tag removal unit 303. ) Extracts the subscriber identifier information from the packet from which the service identifier has been removed by the service identification tag removing unit 302, and refers to the subscriber table corresponding to the extracted subscriber identifier information by referring to the mapping table as shown in Table 10. Port information is found, the subscriber identification tag inserted by the subscriber identification tag inserting unit 109 is removed from the packet, and then transmitted to the corresponding subscriber access port according to the subscriber access port information.

Subscriber identifier Subscriber access port

The service identification tag is removed by the service identification tag removal unit 302 and the packet whose subscriber identification tag is removed by the subscriber identification tag removal unit 303 is transmitted through a subscriber access port provided by the ONU 300. Output to the side.

Hereinafter, a method of allocating a subscriber identifier for each subscriber in the EPON system according to the present invention configured as described above will be described.

In the ONU 300, a criterion for allocating a subscriber identifier may be a subscriber access port to which a subscriber side is connected. That is, the subscriber identifier is allocated by mapping the subscriber access port and the subscriber identifier to 1: 1 and assigns the assigned subscriber identifier. Insert in the form of a tag.

The OLT 100 may obtain MAC address information, which is an address of physical media connected to the subscriber access port of the ONU 100, and a subscriber identifier inserted by the ONU 300, from the data packet transmitted from the ONU 300. have. Accordingly, by learning this in the uplink data packet transmitted from the ONU 300, a subscriber identifier may be allocated to a packet output to the EPON.

Hereinafter, a subscriber identification tag insertion process performed in the optical network termination apparatus will be described in detail.

4 is a detailed flowchart illustrating a subscriber identifier assignment process in an ONU according to the present invention.

In order to allocate a subscriber identifier, the system manager 200 collects and registers subscriber information, which is a target of a service to be provided by a service provider, from the service provider (S100).

In this collected information, subscribers are identified using the subscriber access port provided by the ONU 300 to access the subscriber. In other words, the port provided by the ONU / ONT 300 to access the subscriber and the subscriber are determined in a 1: 1 relationship. However, ONT divides itself into one subscriber and allocates each subscriber identifier (S102).

As described above, the subscriber identifier assigned to each subscriber is based on the relationship between the subscriber access port information and the subscriber identifier through the subscriber identification tag insertion unit 307 of the ONU 300, the subscriber access port information field as shown in Table 1, It is set and stored in the mapping table in the form of a subscriber identification field (S104).

Subsequently, the subscriber identifier assigned as described above is inserted in the form of a subscriber identification tag into an uplink data packet input through the subscriber access port through the subscriber identification tag insertion unit 307 provided in the ONU 300. In this case, the inserted subscriber identifier is a subscriber identifier mapped to a subscriber access port to which an uplink data packet is input.

5 is a flowchart illustrating a process of allocating a subscriber identifier in an OLT according to the present invention.

The OLT 100 cannot directly know subscriber access port information of the ONU 300. Therefore, the subscriber identifier must be allocated by distinguishing the subscriber using the information of the packet provided from the ONU 300 side.

In general, as shown in FIG. 10, a data packet includes a destination MAC address to which the packet is directed, a source MAC address from which the packet is generated, length and type information of the packet, and actual data. And FCS for error correction. In the case of the uplink data packet, the source MAC address is the MAC address of the subscriber device connected to the subscriber access port of the ONU 300, and, in the case of the downlink data packet, the destination MAC address. Becomes the MAC address of the subscriber device connected to the subscriber access port of the ONU 300.

That is, in the EPON system according to the present invention, the uplink data packet includes MAC address information of a physical medium connected to the subscriber access port and subscriber identifier information classified for each subscriber access port.

Accordingly, the OLT 100 extracts the information (MAC address, subscriber identifier) from the uplink data packet received through the subscriber information extracting unit 103 and transmits the information (MAC address, subscriber identifier) to the subscriber information lookup table 105, thereby providing a subscriber information lookup table ( In step 105, the MAC address and the subscriber identifier are mapped and stored (S110 and S112).

Then, when the downlink data packet is delivered from the service provider, the MAC address (ie, destination MAC address) related to the subscriber station device or the service application terminal device is extracted from the downlink data packet, and the subscriber information lookup table is used using the MAC address. In step 105, the subscriber identifier corresponding to the subscriber ID is found and transmitted to the predetermined subscriber identification tag insertion unit 109 provided in the OLT (S114).

In addition, the subscriber identifier found in the subscriber information lookup table 105 is inserted into the downlink data packet transmitted from the service provider through the subscriber identification tag inserting unit 109 in the form of a subscriber identification tag (S116).

The service identification information according to the present invention includes at least one of a service identifier and service priority information. The service identification information is divided according to service types and characteristics, and then inserted into each data packet. Hereinafter, the service identifier allocation process will be described in more detail with reference to FIGS. 5 and 6.

6 is a flowchart illustrating a service identifier assignment process in the optical line termination device according to the present invention.

Referring to FIG. 6, the system manager 200 managing the EPON system according to the present invention may provide information (MAC address, IP address, protocol, priority, TCP / UDP port information) necessary for determining a service type for a data packet. Etc.) to collect and register (S200).

Through the information, the OLT 100 classifies a service type and allocates a service identifier according to the service type (S202). When assigning a service identifier, the service priority may be registered and stored with the service identifier by maintaining the priority included in the originally collected information or by setting a new priority.

Here, the service classification unit 107 provided in the OLT (downlink service) includes a mapping table, and the preset information and the subscriber identification method for the various communication protocols required to classify and analyze the service. Sets and stores the relationship between the subscriber identifier and the service identifier and priority used for service classification in the form of various communication protocol preset information fields, subscriber identifier fields, service identifier fields, and service priority fields.

After the above process is performed, if a data packet is input, information for analyzing a service type is extracted from the data packet, and then the service identification (and service priority) is found in the above-described mapping table using the same. The tag is inserted into the corresponding data packet in step S204.

The above processes are performed when the downlink service from the OLT (100) to the ONU (300), which may be equally applied to the uplink service from the ONU (300) to the OLT (100).

7 is a flowchart illustrating a service identifier allocation process in an ONU according to the present invention.

Referring to FIG. 7, as described above, information necessary for determining a service type of a data packet (such as MAC address, IP address, protocol, priority, TCP / UDP port information, etc.) is determined through the system manager 300. Collect and register (S210), classify the service type through the information and assign a service identifier according to the service type (S212). When assigning a service identifier, the service priority is registered and stored with the service identifier by maintaining the priority included in the originally collected information or by setting a new priority. In other words, the service classification unit 305 provided in the ONU 300 is a subscriber according to the preset information and the subscriber identification method for the various communication protocols required to classify and analyze the service through a mapping table. The relationship between the identifier and the service identifier used for distinguishing the service and the priority are set and stored in the form of various communication protocol preset information fields, subscriber identifier fields, service identifier fields, and service priority fields.

When an uplink data packet is input, information for analyzing a service type is extracted from the packet, and then the mapping table is searched using the extracted information to find a corresponding service identifier to find a corresponding data packet in the form of a service identification tag. It is inserted into (S214). At this time, the service priority is also inserted.

According to the present invention, a service class can be allocated for each combination using a subscriber identifier, a service identifier, and a service priority assigned as described above, and bandwidths can be controlled for each of the service classes.

For example, if the subscriber identifier is 1, the service identifier is 2, and the service priority is 7, the service class is defined as 4, or if the subscriber identifier is 1, the service identifier is 3 and the service priority is 6, the service class is defined as 4. Alternatively, if the subscriber identifier is 1, the service identifier is 4, and the service priority is 5, the service class may be defined in the form of 3.

When the service class is defined as described above, the bandwidth can be controlled differently for each service class. For example, if the service class is 4, the allowed bandwidth is 8, and if the service class is 3, the allowed bandwidth is 7 will be. The bandwidth for each service class is determined through subscriber information on a service provided by a service provider and contract information related to the service bandwidth or quality that the service provider makes with the subscriber.

A method of controlling bandwidth for each service class will be described in detail with reference to the accompanying drawings.

8 is a flowchart illustrating a method of controlling bandwidth for each service class in an OLT according to the present invention.

Referring to FIG. 8, the system manager 200 collects and registers subscriber information, which is a service target for a service to be provided by a service provider, and contract information related to service bandwidth or quality made with the subscriber (S300).

The bandwidth control unit 106 of the OLT 100 includes a mapping table to display a relationship between service classes classified according to a combination of a subscriber identifier, a service identifier, and a service priority. The subscriber identifier field, the service identifier field, and the service priority field. , And set and store in the form of a service class field (S302).

In addition, a bandwidth control rule table is provided in the bandwidth controller 106 of the OLT 100, and the control parameters related to the bandwidth control registered for the service represented by the divided service class and the service class are included. The relationship is set and stored in the form of a service class field and a bandwidth control parameter field (S304). The bandwidth control parameter includes measurement information for collecting actual bandwidth information of a corresponding service, allowable bandwidth allocated to the corresponding service, and service bandwidth information measured before data packet input for the corresponding service class. In addition, the bandwidth controller 106 of the OLT 100 may include a predetermined queue buffer for each combination of a subscriber identifier field and a service priority field.

When the downlink data packet is input, the bandwidth controller 106 of the OLT 100 extracts subscriber identifier information, service identifier and priority information from the packet, and extracts the extracted subscriber identifier information, service identifier and priority information from the packet. Finds a corresponding service class in the subscriber identifier field, service identifier field, service priority field, service class field mapping table, and finds a bandwidth control parameter related to the service class in the bandwidth control rule table using the service class. (S306).

For the service class associated with the packet included in the found control parameter, the bandwidth information measured before the packet is delivered and the allowable bandwidth information are compared (S308). Dropping the delivered packet (S314), and if it does not exceed the allowance, and passes the packet, at this time, after storing in the queue buffer according to the combination of the subscriber identifier field, service priority field associated with the packet, Scheduling according to the service priority information (S312).

The bandwidth measurement for the service class is performed every predetermined period set in the bandwidth control parameter, and the number of packets to be passed per predetermined unit time, the number of bytes for a packet to be passed per predetermined unit time, or the packet to be passed per predetermined unit time. It is in the form of calculating the number of bits for, and it is preferable to update before a new packet is delivered.

9 is a flowchart illustrating a bandwidth control process for each service class in the ONU according to the present invention. The bandwidth control process for each service class in the ONU is performed similarly to the bandwidth control process in the OLT, except that the object becomes an uplink service.

Referring to FIG. 9, the system manager 200 receives and registers subscriber information, which is a service target for a service to be provided by a service provider, and contract information related to service bandwidth or quality made with the subscriber, from the service provider (see FIG. S320), by using the registration information, the subscriber identifier information, the service identifier and the priority information, the relationship between the service class classified according to the combination of the subscriber identifier field, service identifier field, service priority field type subscriber identifier field, service A mapping table having an identifier field, a service priority field, and a service class field is provided in the bandwidth controller 304 of the ONU 300 (S322).

In addition, a bandwidth control rule table (Bandwidth Control Rule Table) is provided in the bandwidth control unit 304, the relationship between the service parameters and the control parameters related to the bandwidth control for each registered service class service class field, bandwidth control parameters Set and store in field form (S324).

In addition, the bandwidth controller 304 may include a queue buffer for each combination of a subscriber identifier field and a service priority field using the subscriber identifier, the service identifier, and the service priority.

In this state, when the uplink data packet is input, the bandwidth controller 304 extracts the subscriber identifier, the service identifier, and the service priority from the corresponding packet, and uses the extracted subscriber identifier information, the service identifier, and the priority information. After the service class is found, the bandwidth control parameter related to the service class is found in the bandwidth control rule table using the service class (S326). As described above, the bandwidth control parameter includes allowable bandwidth, bandwidth measurement information of the corresponding service class, and bandwidth information of the corresponding service class currently measured.

Accordingly, bandwidth control is performed using the bandwidth control parameter, which is compared with the allowable bandwidth information and the bandwidth information measured before the packet is delivered for the service class associated with the input uplink data packet (S328). If the measured bandwidth exceeds the allowable value, the dropped packet is dropped. If the measured bandwidth does not exceed the allowable value, the transmitted packet is passed upstream (S330, S332, S334). The bandwidth measurement for the service class is performed every predetermined period set in the bandwidth control parameter, and the number of packets to be passed per predetermined unit time, the number of bytes for a packet to be passed per predetermined unit time, or the packet to be passed per predetermined unit time. This is done in the form of calculating the number of bits for and updates before a new packet is delivered.

In addition, the passing packet is stored in a corresponding queue buffer corresponding to a combination of a subscriber identifier and a service priority associated with the packet, and then the queue buffers are scheduled according to the service priority information (S330).

While the invention has been described above with reference to its preferred embodiments, those skilled in the art will be able to variously modify the invention without departing from the spirit and scope of the invention as set forth in the claims below. And can be practiced with modification. Accordingly, modifications to future embodiments of the present invention will not depart from the technology of the present invention.

As described above, the present invention can further clarify the subscriber management by dividing the subscriber access port provided by the ONU / ONT into the subscribers by further dividing the ONU and the ONT into subscribers. Depending on the type, service bandwidth control can be more diverse and detailed. As a result, it is possible to efficiently operate the limited service bandwidth provided by the EPON system.

Claims (41)

Allocating a subscriber identifier for distinguishing subscribers for each subscriber; Allocating a service identifier for identifying a service for each service type; Classifying a service class indicating a class of a service by a combination of the assigned subscriber identifier and service identifier; And And setting an allowable service bandwidth for each of the divided service classes. The method of claim 1, Allocating service priorities for classifying service characteristics according to service types; The classifying of the service class may include classifying a service class by a combination of the assigned subscriber identifier, the service identifier, and the service priority. The method according to claim 1 or 2, The allocating of the subscriber identifier may include allocating a subscriber identifier for each subscriber access port provided for access by the subscriber at the ONU side. The method of claim 3, The allocating of the subscriber identifier may include assigning one subscriber identifier by dividing itself into one subscriber in case of ONT. The method according to claim 1 or 2, The method of allocating the subscriber identifier may include allocating a subscriber identifier using an MAC address, which is an address of physical media connected to the ONU / ONT, in the case of an OLT. The method of claim 1, wherein assigning the service identifier comprises: Collecting information for identifying a service type for a data packet; Classifying a service type using the registered information; And And assigning a unique service identifier for each classified service type. 7. The method of claim 6, wherein assigning a service priority is When allocating the service priority for each of the classified service types, the service bandwidth management method for each subscriber, wherein the priority information included in the information for identifying the service type for the collected data packets is maintained as it is. . 7. The method of claim 6, wherein assigning a service priority is When allocating service priorities according to the classified service types, new priorities are allocated for each service type regardless of priority information included in information for identifying service types for the collected data packets. How to manage service bandwidth per subscriber. The method according to claim 1 or 2, The allowable service bandwidth set for each service class corresponds to a bandwidth contracted between a service subscriber and a service provider for a corresponding service. The method according to claim 1 or 2, And controlling the bandwidth of the data packet according to the set allowable service bandwidth for each service class. The method of claim 10, The controlling of the bandwidth may be performed by controlling a bandwidth according to a control parameter related to bandwidth control for each service class. The method of claim 11, wherein the control parameter related to the bandwidth control is And at least one of information on bandwidth measurement processing for each service class, allowable bandwidth set for each service class, and bandwidth information measured for each service class. The method of claim 12, wherein controlling the bandwidth Comparing the bandwidth information measured before the data packet to execute the bandwidth control with the allowable bandwidth corresponding to the service class of the data packet; And If the previously measured bandwidth information exceeds the allowable bandwidth, drop the corresponding data packet; and if the previously measured bandwidth information does not exceed the allowable bandwidth, the subscriber includes normal processing of the corresponding data packet. How to manage service bandwidth per star. The method of claim 12, The bandwidth information measured for each service class is updated before a new data packet is delivered. The method of claim 12, The information on the bandwidth measurement processing for each service class includes bandwidth measurement period information, and the bandwidth measurement information for each service class is measured and updated for each period according to the period information. . The method according to claim 14 or 15, The bandwidth measurement may be performed by calculating a number of packets to be passed per predetermined unit time, a number of bytes for a packet to be passed per predetermined unit time, or a number of bits to a packet to be passed per predetermined unit time. How to manage service bandwidth per star. The method of claim 13, wherein controlling the bandwidth Providing a queue buffer for each combination of the subscriber identifier and service priority; Storing the undropped data packet in a corresponding queue buffer according to a combination of subscriber identifier and service priority of the data packet; And And scheduling the queue buffers according to respective service priorities. A subscriber identification tag inserting unit for searching for an uplink data packet to be transmitted to the optical line termination device, and inserting a corresponding subscriber identifier in the form of a subscriber identification tag among subscriber identifiers assigned for each subscriber; A service classification unit for classifying a service type and a characteristic to which the uplink data packet belongs and searching for a service identifier corresponding to the uplink data packet among service identifiers allocated for each service type; A service identification tag insertion unit for inserting a service identifier retrieved by the service classification unit in the form of a service identifier tag into the uplink data packet; A bandwidth controller for classifying a service class according to a subscriber identifier and a service identifier inserted into the uplink data packet and controlling a service bandwidth according to the classified service class; And And a link control unit for transmitting an uplink data packet to an optical line termination device under the control of the bandwidth control unit. The method of claim 18, A subscriber identification tag removal unit for removing the subscriber identification tag included in the downlink data packet transmitted from the optical line termination device through the link control unit; And And a service identification tag removing unit for removing the service identification tag included in the downlink data packet so as to be delivered to the subscriber. The method of claim 18, wherein the subscriber identification tag insertion unit An optical network termination of an Ethernet-based passive optical subscriber network system including a mapping table in the form of a subscriber access port field and a subscriber identifier field, wherein a subscriber identifier corresponding to a subscriber access port into which a corresponding uplink data packet is input is found. Device. The method of claim 18, The service classification unit further searches for service priority for a service to which an uplink data packet belongs, according to service type and service characteristic. And the service identification tag inserting unit inserts a service priority together with the service identifier into an uplink data packet in the form of a service identification tag. 22. The method of claim 18 or 21, wherein the service classification unit An optical network termination device of an Ethernet-based passive optical subscriber network system comprising a mapping table including two or more fields among a communication protocol preset information field, a subscriber identifier field, a service identifier field, and a service priority field for each service type. . The method of claim 21, wherein the bandwidth control unit And a mapping table in the form of a subscriber identifier field, a service identifier field, a service priority field, and a service class field. 19. The system of claim 18, wherein the bandwidth controller An optical network of an Ethernet-based passive optical subscriber network system including a bandwidth rule table describing bandwidth control parameters for each service class, and controlling bandwidth for each service class using the bandwidth control parameters described in the bandwidth rule table. Termination device. The method of claim 24, wherein the bandwidth control parameter is An optical network termination device of an Ethernet-based passive optical subscriber network system comprising one or more of information on bandwidth measurement processing by service class, allowable bandwidth set by service class, and bandwidth information measured by service class. The method of claim 24, wherein the bandwidth control unit The bandwidth measured before the uplink data packet corresponding to the service class corresponding to the uplink data packet is compared with the allowable bandwidth in the corresponding service class so that the previously measured bandwidth information exceeds the allowable bandwidth. If the data packet is dropped, and if the previously measured bandwidth information does not exceed the allowable bandwidth, the optical network termination device of the Ethernet-based passive optical subscriber network system, characterized in that for controlling the transmission of the uplink data packet. The method of claim 24, wherein the bandwidth control unit And a plurality of queue buffers classified by the combination of the subscriber identifier and the service priority, and storing the uplink data packet in the queue buffer corresponding to the combination of the subscriber identifier and the service priority, Therefore, the optical network termination device of the Ethernet-based passive optical subscriber network system, characterized in that for scheduling each queue buffer. A subscriber information lookup table for storing a subscriber identifier allocated for each MAC address, which is an address of physical media connected to an optical network end device; A subscriber identification tag inserting unit that finds a corresponding subscriber identifier in the subscriber information lookup table using a destination MAC address of a downlink data packet to be transmitted to an optical network termination device and inserts the corresponding subscriber identifier in the form of a subscriber identification tag in the downlink data packet; A service classification unit for classifying a service type to which the downlink data packet belongs among service identifiers allocated for each service type and providing a corresponding service identifier; A service identification tag insertion unit for inserting a service identifier provided by a service classification unit into a service identification tag in the downlink data packet; A bandwidth controller for checking a corresponding service class according to a combination of a service identifier and a subscriber identifier inserted into the downlink data packet, and controlling a service bandwidth according to the service class; And The Ethernet-based passive optical subscriber network system of the present invention comprises a link control unit for transmitting and receiving an Ethernet-based packet to and from the subscriber end device and transmitting the corresponding downlink data packet to the subscriber end device under the control of the bandwidth control unit. Optical line terminator. The method of claim 28, And extracting a source MAC address and a subscriber identifier from an uplink data packet received through the link control unit, and updating the subscriber information lookup table by using the extracted MAC address and subscriber identifier. Fiber terminator in an Ethernet-based passive subscriber network system. The method of claim 28 or 29, A subscriber identification tag removal unit for removing a service identification tag from an uplink data packet transmitted from the optical network termination device through the link control unit; And And a service identification tag removing unit for removing a subscriber identification tag from the uplink data packet. The method of claim 28 or 29, The service classifier further allocates a service priority for a service to which an uplink data packet belongs according to service type and service characteristic. And the service identification tag inserting unit inserts a service priority together with the service identifier in an uplink data packet in the form of a service identification tag. 32. The method of claim 31, wherein the service classification unit An optical line termination device of an Ethernet-based passive optical subscriber network system comprising a mapping table including at least two of a communication protocol preset information field, a subscriber identifier field, a service identifier field, and a service priority field for each service type. . 29. The system of claim 28, wherein the bandwidth controller An optical line of an Ethernet-based passive optical subscriber network system including a bandwidth rule table for describing bandwidth control parameters for each service class, and controlling bandwidth for each service class using the bandwidth control parameters described in the bandwidth rule table. Termination device. 34. The method of claim 33, wherein the bandwidth control parameter is An optical line termination device of an Ethernet-based passive optical subscriber network system comprising one or more of information on bandwidth measurement processing for each service class, allowable bandwidth set for each service class, and bandwidth information measured for each service class. 35. The system of claim 34, wherein the bandwidth controller The bandwidth measured before the uplink data packet corresponding to the service class corresponding to the downlink data packet is compared with the allowable bandwidth in the corresponding service class, so that the previously measured bandwidth information exceeds the allowable bandwidth. If the data packet is dropped, and if the previously measured bandwidth information does not exceed the allowable bandwidth, the optical line termination device of the Ethernet-based passive optical subscriber network system, characterized in that the control to transmit the downlink data packet. 36. The system of claim 35, wherein the bandwidth controller And a plurality of queue buffers classified by the combination of the subscriber identifier and the service priority, and storing the uplink data packet in the queue buffer corresponding to the combination of the subscriber identifier and the service priority. Therefore, the optical line termination device of the Ethernet-based passive subscriber network system, characterized in that for scheduling each queue buffer. One or more optical network terminations for assigning a service class according to a combination of a subscriber receiving a service, a service type and service priority information provided to the subscriber, and a bandwidth for each service class to control uplink bandwidth for each service class. Device; An optical line termination device for allocating a service class according to a combination of a subscriber receiving a service, a service type and service priority information provided to the subscriber, allocating bandwidth for each service class, and controlling downlink bandwidth for each service class; And Ethernet-based passive optical including a system manager which collects service provider information, service information provided by a service provider, subscriber information provided by a service, and information for classifying a service and provides the information to the optical network termination device and the optical line termination device. Subscriber Network System. The method of claim 37, The optical network termination device is an Ethernet-based passive optical subscriber network system, characterized in that for distinguishing the subscriber by using the subscriber access port. The method of claim 37, The optical line terminator is an Ethernet-based passive optical subscriber network system, characterized in that for identifying the subscriber by using the MAC address of the physical medium connected to the optical network terminator. The method of claim 36, And the optical network termination device and the optical line termination device respectively set allowable bandwidths for each service class and control transmission of data packets to be within the set allowable bandwidth. The method of claim 36, The optical network termination device and optical line termination device, A plurality of queue buffers, each classified by a combination of subscriber and service priority, are stored in a queue buffer corresponding to a combination of subscriber and service priority, and then scheduled according to priority. Ethernet-based passive optical subscriber network system.

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