KR20060080510A - System and method for transmitting/receiving control message in an ethernet passive optical communication network - Google Patents

Abstract

The present invention relates to an Ethernet-based passive optical network having a management node managing terminals existing in a network and a host receiving a control message from the management node and transmitting the control message to the terminal, wherein the host transmits a control message. A method, comprising: receiving an arbitrary control message from the management node, inserting a correlation tag in which a preset setting value is recorded in the received control command message, and constructing a new control message; It characterized in that it comprises the step of transmitting to the terminal.

Ethernet, optical network, EPON, OLT, ONU

Description

SYSTEM AND METHOD FOR TRANSMITTING / RECEIVING CONTROL MESSAGE IN AN ETHERNET PASSIVE OPTICAL COMMUNICATION NETWORK}             

1 is a diagram illustrating a configuration for transmitting a packet to a subscriber via an ONU in an OLT in a typical EPON

2 is a diagram illustrating a configuration in which a subscriber transmits a packet to an OLT through an ONU in a typical EPON;

3 is a diagram illustrating an EMS configuration / query message format transmitted from a conventional EPM host to OLT / ONUs.

4 is a flowchart illustrating a process of processing an EMS setup / query response message performed by a conventional EPM host.

5 illustrates a new setup / query control message format according to an embodiment of the present invention.

6 is a flowchart illustrating a process of receiving and processing a new setup / query response message by an EPM host according to an embodiment of the present invention.

7 is a flowchart illustrating a process in which an OLT / ONU receives a new setup / query control message and transmits a response message thereto according to an embodiment of the present invention.

The present invention relates to an Ethernet passive optical network (hereinafter referred to as 'EPON'), and more particularly to a method and system for transmitting and receiving control messages.

Ethernet-based passive optical subscriber network, ie EPON, is able to provide multimedia services such as voice, data, and video with high speed and high capacity.

The Institute of Electrical and Electronics Engineers (IEEE) 's Local Area Network (LAN) / MAN Standards Committee, in November 2000, aims to apply Ethernet, which is currently widely used in subscriber networks, to the Ethernet in the First Mile research group. Formation has been approved and the EPON related standardization work is in progress.

The EPON has a subscriber network structure that forms a distributed topology of a tree structure by connecting a plurality of optical network units (ONUs) by using a manual splitter to one optical line terminal (OLT). Such a system for managing devices such as OLT or ONU of EPON is an element management system (EMS).

Next, a method of transmitting and receiving a packet in a general EPON will be described with reference to FIGS. 1 and 2.

1 is a diagram illustrating a configuration of transmitting a packet to a subscriber through an ONU in an OLT in a typical EPON.

Referring to FIG. 1, the OLT 100 broadcasts a packet to a plurality of ONUs 150-1 to 150-3 through a splitter 120. Here, the packet transmitted by the OLT 100, that is, the frame structure 130 is defined in the IEEE 802.3 standard. The ONUs 150-1 to 150-3 receive all packets transmitted by the OLT 100 and recognize only packets that match the ONU Medium Access Control (MAC) address specified in the header as their packets. Discard the remaining packets. For example, ONU 150-1 recognizes only '1' packet as its own packet and transmits it to subscriber. Here, the subscriber is an Ethernet subscriber.

FIG. 2 is a diagram illustrating a configuration in which a subscriber transmits a packet to an OLT through an ONU in a typical EPON.

Referring to FIG. 2, subscribers transmit packets to each of the ONUs 150-1 to 150-3 to which they belong. In this case, the subscribers transmit a packet in a predetermined time slot to avoid transmission collision with other subscriber packets using a time division multiplexing scheme.

1 and 2, the EMS 110 managing the components of the EPON, the Simple Network Management Protocol agent 112, and the Ethernet PON Module (EPM) host 114 are connected to the EPON. The SNMP agent 112 is a protocol agent that monitors and controls network management and operation of network devices.

The EPM host 114 receives control command messages, such as a setup / query control message sent from the EMS 110, from the SNMP agent 112 to send the OLT 100 // ONUs 150-1 to 150-3. Or a response to the control message of the EMS 110 from the OLT / (100) or the ONUs 150-1 to 150-3, and serves as an intermediate medium. Accordingly, the EPM host 114 may include 16 OLT IP (Internet protocol) addresses and an index mapping table mapped thereto, 512 ONU MAC addresses and an index mapping table mapped thereto, and 2048 ONU logical links. ) It stores and manages MAC addresses and index mapping tables mapped to them.

Hereinafter, for convenience of explanation, a setting / query control message among a plurality of control messages will be described as an example.

When transmitting the setting / query control message to the OLT / (100) or the ONUs 150-1 to 150-3 in the EM 110, the index of the OLT IP address to be sent, the index of the ONU MAC address, and the ONU The logical link index and various system control information messages to be controlled are transmitted to the EPM host 114 through the SNMP agent 112. Accordingly, the EPM host 114 searches for the IP address, the MAC address, and the logical link corresponding to the index information of the OLT and ONUs in each index mapping table with reference to the information, and converts the IP address, MAC address, and logical link into the corresponding address and link, socket to the OLT 100 or / ONUs 150-1 to 150-3. Here, the setting / inquiry message is a message transmitted from the EMS 110 to the OLT 100 or the ONUs 150-1 to 150-3, and an operator may set a system operating bandwidth using the setting / inquiry message. After setting, you can check whether the setting is correct.

3 is a diagram illustrating an EMS setup / query message format transmitted from a conventional EPM host to OLT / ONUs.

Referring to FIG. 3, first, the EMS setup / retrieval message includes a message type field 302 indicating a type, a data length field 304 indicating a data length, and an EPM IP field 306 indicating an EPM IP address. , ONU MAC address / ONU logical link MAC address field 308 indicating ONU MAC address or ONU logical link MAC address, ONU logical link index field 310 indicating ONU logical link index, and setting indicating inquiry / setting data / Query data field 312. On the other hand, other control commands may be recorded in the setting / query data field 312.

On the other hand, the OLT or / ONUs receiving the EMS setup / query message as shown in FIG. 3 transmits an EMS setup / query response message similar to the EMS setup / query message to the EPM host. However, the difference between the EMS setup / retrieval message transmitted from the EPM host and the EMS setup / retrieval response message transmitted from the OLT / ONU is different from the contents recorded in the setup / retrieval data field.

Receiving the EMS setup / retrieval response message, the EPM host finds one-to-one mapped index information with the EPM IP address, ONU MAC address, and ONU logical link using the stored index mapping table.

4 is a flowchart illustrating a process of processing an EMS setup / query response message performed by a conventional EPM host.

Referring to FIG. 4, first, in step 402, the EMS host determines whether the received EMS setup / retrieval response message type is a setup / retrieval message type. As a result, if the setting / inquiry message type proceeds to step 404, otherwise proceeds to step 410 to process the corresponding response message in another module.

In step 404, the EPM host compares whether the EPM IP address of the setup / query response message matches the EPM IP index mapped in the index mapping table, and if so, proceeds to step 406; otherwise, step 412 Proceeds to ignore the response message.

In step 406, the EPM host compares whether the ONU MAC address of the setup / query response message matches the EPM MAC index mapped in the index mapping table, and if so, proceeds to step 408; otherwise, 412 Proceed to step Ignore the response message.

In step 408, the EPM host detects logical link information and port information of the ONU, and transmits the response message to the SNMP agent.

As described above, the EPM host conventionally performs a data processing process of comparing the EMS configuration / query response messages received from the OLT / ONU with the index mapping table that was previously stored. This means that a time delay occurs due to response message processing in the EPM host.

On the other hand, after the EMS transmits a control message to the OLT / ONU, the EMS cannot transmit another control message until the response message to the command message is received. Therefore, when the EMS does not receive a response message corresponding to the command message within a predetermined time, the EMS considers that the message transmission has failed and repeatedly transmits the same control message. That is, if a long time delay occurs due to the response message processing in the EPM host, the EMS should consider that the response message has not been received and repeatedly transmit the same control message. This is a problem that the EMS is repeatedly transmitted of the same control message, there is a problem that can not transmit another control message.

Accordingly, an object of the present invention, which was devised to solve the problems of the prior art operating as described above, is to provide a system and method for transmitting a new control message from an EPON to an OLT / ONU.

It is still another object of the present invention to provide a system and method for efficiently processing new control messages received from OLT / ONUs in EPON.

The first method of the present invention for achieving the above objects; In a passive optical network based on Ethernet having a management node for managing terminals existing in the network and a host for receiving a control message from the management node and transmitting the control message to the terminal, the host transmits a control message, Receiving a random control message from the management node, inserting a correlation tag in which a preset setting value is recorded in the received control command message to construct a new control message, and sending the new control message to the terminal Characterized in that the transmission process.

The second method of the present invention for achieving the above objects; In an Ethernet based passive optical network having a management node for managing terminals existing in a network and a host for receiving a control message from the management node and transmitting the control message to the terminal, the terminal transmits a control response message to the host. The method of claim 1, further comprising: receiving a new control message in which a correlation tag in which a preset setting value is recorded is inserted from the host, and including a correlation tag having the same value as the setting value in response to the new control message. And constructing a response message, and transmitting the new response message to the host.

The system of the present invention for achieving the above objects; In an Ethernet-based passive optical network having a management node for managing terminals existing in a network and a host for receiving a control message from the management node and transmitting the control message to a terminal, the system for transmitting and receiving a control message from the management node Upon receiving the control message, a new control message is formed by inserting a correlation tag in which a preset setting value is recorded in the control message, and receiving a new control message from the host and a host transmitting the new control message to the terminal. In this case, a new response message may be configured by including a correlation tag having the same value as the setting value recorded in the correlation tag of the new control message, and the terminal may be transmitted to the host.

Hereinafter, with reference to the accompanying drawings will be described in detail the operating principle of the preferred embodiment of the present invention. Like reference numerals are used to designate like elements even though they are shown in different drawings, and detailed descriptions of related well-known functions or configurations are not required to describe the present invention. If it is determined that it can be blurred, the detailed description thereof will be omitted. Terms to be described later are terms defined in consideration of functions in the present invention, and may be changed according to intentions or customs of users or operators. Therefore, the definition should be made based on the contents throughout the specification.

The present invention proposes a new control message type in an Ethernet passive optical network (hereinafter referred to as 'EPON'). More specifically, by adding a correlation tag to an existing control message, a process according to transmission and reception of a control message can be performed more quickly.

In the present invention, a setting / query control message among various control messages will be described as a representative example for convenience of description. Of course, it should be noted that the present invention is not limited to the setting / query control message but is applicable to all control messages.

5 illustrates a new setup / query control message format according to an embodiment of the present invention.

Referring to FIG. 5, the new setup / query control message according to the present invention has a form in which a correlation tag 500 is added to the existing setup / query control message of FIG. 3.

A process of processing a control message between an EPM (Ethernet PON module) host and an OLT / ONU in the EPON will be described with respect to the new configuration / retrieval message.

An element management system (EMS) that manages the devices of the EPON transmits a setup / retrieval control message to the EPM host. The EPM host adds a 2-byte long correlation tag to the received setup / query control message, records a specific value in the added correlation tag, and transmits OLT (Optical Line Terminal) or / ONU (Optical Line Terminal). / Optical Network Unit). Here, the specific value may be set differently for each control message, or may be set differently according to a destination, that is, OLT or ONU (also referred to as ONT (Optical Network Terminal)).

The OLT / ONU transmits a response message according to the setup / query control message of the EMS to the EPM host. Here too, the OLT / ONU adds a correlation tag to the response message, and records a specific value equal to a specific value recorded by the EPM host in the added correlation tag and transmits it to the EPM host.

The EPM host reads the correlation tag value recorded in the response message received from the OLT / ONU and compares it with the correlation tag value of the control message transmitted by the EPM host. In the same case, the EPM host ignores other fields, reads only setting / query data fields, and transmits corresponding setting / query data to a Simple Network Management Protocol (SNMP) agent.

Accordingly, in the present invention, as compared with the time taken to process the message by using the index mapping table previously stored by the EPM host receiving the response message to the control message, the correlation tag value matches in the present invention. By only checking whether the message processing time is shortened.

Here, the subject adding the correlation tag becomes an EPM host when the control command message is transmitted from the downlink, that is, the EPM host to the OLT or one ONU, and the control command message from the uplink, that is, the OLT / ONU to the EPM host. If it sends a response to, it is either ONU or OLT.

6 is a flowchart illustrating a process of receiving and processing a new setup / retrieval response message by an EPM host according to an embodiment of the present invention.

Referring to FIG. 6, the EPM host receives a response message for a setup / query control message from an OLT / ONU. In step 602, the EPM host determines whether the message type of the received response message is a setup / query message. As a result of the determination, in the case of the setting / query message, the process proceeds to step 604, and if not, the process proceeds to step 608 to control processing of the response message by another module. In step 604, the EPM host reads the correlation tag value of the received setup / query response message and compares it with the correlation tag value transmitted by the EPM host. As a result of the comparison, if it matches, the process proceeds to step 606, and if it does not match, proceeds to step 610 to ignore the response message.

In step 606, the EPM host transmits only information on the setting / query data field of the response message to the SNMP agent.

7 is a flowchart illustrating a process in which an OLT / ONU receives a new setup / query control message and transmits a response message thereto according to an embodiment of the present invention.

Referring to FIG. 7, in step 702, the OLT / ONU receives a new setup / query control message to which a correlation tag is added from an EPM host, and proceeds to step 704. In step 704, the OLT / ONU constructs a response message to the control message and proceeds to step 706. Here, the OLT / ONU records a correlation tag value identical to a correlation tag value of a setup / query control message transmitted by the EPM host in a correlation tag field of the response message. In step 706, the OLT / ONU transmits the new response message to the EPM host. For example, when the EPM host transmits the message by setting the correlation tag value of the control message to '1', the EPM host stores the EPM IP address, the ONU MAC address, and the ONU logical link MAC address having the '1' tag, When receiving a response message with a tag value, the ONU MAC address and ONU logical link MAC address information of the message can be known by referring to the stored information.

Meanwhile, in the detailed description of the present invention, specific embodiments have been described, but various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined not only by the scope of the following claims, but also by those equivalent to the scope of the claims.

According to the present invention operating as described in detail above, the EPON adds a correlation tag field to an existing control command message, transmits a new control message having a specific value recorded in the correlation tag field to the OLT / ONU, and the OLT / In response to this, the ONU adds a correlation tag field that records the same value as the specific value to the response message and transmits the correlation tag field, thereby greatly reducing the processing time of the existing control message. Accordingly, there is an advantage in that the EPM host can reduce the latency of processing a message, thereby preventing data loss, thereby improving system performance and reliability.

Claims (10)

In an Ethernet-based passive optical subscriber network having a management node that manages terminals existing in a network and a host that receives a control message from the management node and transmits the control message to the terminal, the host transmits a control message. , Receiving an arbitrary control message from the management node; Configuring a new control message by inserting a correlation tag in which a predetermined setting value is recorded in the received control command message; Transmitting the new control message to the terminal. The method of claim 1, The set value is characterized in that for recording the control messages differently. The method of claim 1, The setting value is recorded differently for each terminal to which a control message should be transmitted. The method of claim 1, When the host receives a new response message for the new control message from the terminal, the host compares the correlation tag setting value of the new control message with the correlation tag setting value of the new response message and recognizes that the response message is the correct response message. The method characterized in that it further comprises. In an Ethernet-based passive optical subscriber network having a management node managing terminals existing in a network and a host receiving a control message from the management node and transmitting the control message to the terminal, the terminal transmits a control response message to the host. In the way, Receiving, from the host, a new control message in which a correlation tag in which preset settings are recorded is inserted; Constructing a new response message including a correlation tag having the same value as the set value in response to the new control message; Transmitting the new response message to the host. A system for transmitting and receiving a control message in an Ethernet-based passive optical subscriber network having a management node managing terminals existing in a network and a host receiving a control message from the management node and transmitting the control message to the terminal, Receiving a control message from the management node, inserting a correlation tag in which a preset setting value is recorded into the control message to construct a new control message, and transmitting a new control message to the terminal; Receiving a new control message from the host, including a correlation tag having the same value as the setting value recorded in the correlation tag of the new control message to construct a new response message, and including a terminal for transmitting the response message to the host; Said system. The method of claim 6, When the value of the correlation tag of the new response message received from the terminal is the same as the setting value of the correlation tag of the control message transmitted by the host, only the information of the control information related field of the new response message is transmitted to the management node. The system, characterized in that. The method of claim 6, And the host records the set value differently for each new control message. The method of claim 6, And the host records the set value differently for each terminal to which a new control message should be transmitted. The method of claim 6, When the host receives a new response message for the new control message from the terminal, the host compares the correlation tag setting value of the new control message with the correlation tag setting value of the new response message and recognizes that it is a correct response message. Said system.

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