JP2006020240A - Band control method, subscriber accommodation apparatus, indoor terminating equipment, and user terminal - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a band control method with which bands are fairly allocated to users even if an ONU accommodates user terminals more than an upper limit value of the number of user terminals for an LLID allocated by an OLT. <P>SOLUTION: When an OLT allocates a band for each of LLIDs allocated to a plurality of ONUs connected to the present device, with bands for the maximum number of user terminals to be accommodated in a predetermined ONU 2 as an upper limit, the OLT allocates, to each ONU, bands corresponding to the number of user terminals accommodated in the ONU, and the ONU divides the bands allocated to the OLT with the number of user terminals accommodated in the present device and allocates the bands to user terminals 6. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to bandwidth control of an optical communication system, and more particularly to a bandwidth control method for controlling the bandwidth allocated to each user terminal in a PON (Passive Optical Network) system.

  The Gigabit Ethernet (registered trademark) -PON system (hereinafter referred to as GE-PON system) is being established in particular by the standardization activity of IEEE (Institute of Electrical and Electronics Engineers) 802.3. In the GE-PON system, a plurality of in-house terminal units (ONU: Optical Network Unit) are connected to a subscriber accommodation device (OLT: Optical Line Termination) installed on the station side by using an optical coupler and an optical fiber. It is an optical passive network that connects with many. The main data between the OLT and the ONU is an Ethernet (registered trademark) frame (hereinafter referred to as a layer 2 frame), and band control and the like are managed by MPCP (Multi-Point MAC Control Protocol) defined by IEEE 802.3ah. The

  IEEE 802.3ah performs bandwidth control for each LLID (Logical Link ID) assigned to the ONU, manages bandwidth control of users contracted to the ONU with the OTL, and the OLT makes a report request to the ONU. The ONU requests the upstream bandwidth from the OLT for each LLID. The OLT manages the upstream bandwidth of all ONUs according to the upstream bandwidth request from each ONU managed by the own device, and controls the timing of upstream data.

IEEE802.3ah

  However, the bandwidth control of the above prior art has a problem that bandwidth management over LLID cannot be performed because the OLT requests an upstream bandwidth for each LLID assigned to the ONU. That is, when a large number of users are accommodated in the ONU, there is a problem that the user's bandwidth can be managed only up to the number of assigned LLIDs.

  The present invention has been made in view of the above, and even when the ONU accommodates a number of user terminals exceeding the upper limit of the number of user terminals for the LLID allocated by the OLT, the bandwidth is allocated to the users fairly. An object is to obtain a bandwidth control method capable of

  In order to solve the above-described problems and achieve the object, the bandwidth control method according to the present invention includes a plurality of in-house terminal devices that accommodate a plurality of user terminals, and a subscriber accommodation that manages the bandwidth for each of these in-home terminal devices. A bandwidth control method for the plurality of user terminals of a communication system including a device, wherein the user terminal sends registration information including terminal identification information for identifying the terminal itself to the home terminal device to the home terminal device. And the home terminal device manages the plurality of user terminals accommodated by the own device based on the terminal identification information included in the registration information, and includes the number of user terminals managed by the own device and the terminal identification information. A number change request is transmitted to the subscriber accommodation device, and the bandwidth allocated from the subscriber accommodation device is divided into the number of user terminals managed by the own device and assigned to each user terminal. The subscriber accommodation device accommodates the plurality of in-house terminal devices connected to the own device based on the number of user terminals notified by the registration number change request and the terminal identification information, and these in-home terminal devices The user terminal is managed, and a band corresponding to the number of user terminals accommodated in the in-home terminal device is set with an upper limit of a band corresponding to the maximum accommodated number of user terminals predetermined for each of the plurality of in-home terminal devices. Assigning to the plurality of in-home terminal devices.

  According to the bandwidth control method of the present invention, when the subscriber accommodation device allocates a bandwidth to each of a plurality of residential termination devices connected to the own device, the maximum accommodation of user terminals accommodated in a predetermined residential termination device. A bandwidth corresponding to the number of user terminals accommodated in the home terminal device is allocated to each home terminal device with a bandwidth of several minutes as an upper limit, and the home terminal device assigns the bandwidth allocated to the subscriber accommodation device to Since it is divided by the number of user terminals to be accommodated and allocated to each user terminal, even if the number of user terminals accommodated by the in-home terminal device exceeds the maximum accommodated number, the subscriber accommodation device becomes the in-home terminal device. The bandwidth can be allocated fairly to the user terminals accommodated by the in-home terminal device without changing the allocated bandwidth.

  Embodiments of a bandwidth control method according to the present invention will be described below in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.

  An embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a diagram showing the configuration of a communication system using GE-PON to which the bandwidth control method according to the present embodiment of the present invention is applied. The communication system shown in FIG. 1 includes a home terminal device (hereinafter referred to as “terminal terminal device”) that accommodates a plurality of (in this case, three) user terminals 6 via a terminal terminal device 5 constituted by a wireless local area network (LAN) or a hub. ONU) 2 and a subscriber accommodation device (hereinafter referred to as OLT) 1 installed on the station side are connected by an optical transmission path (optical fiber 3 and optical passive element 4 such as a star coupler). . Frames handled by this communication system (user frames transmitted and received by the user terminal 6 and control frames between the OLT 1 and the ONU 2) are layer 2 frames that are Ethernet (registered trademark) frames.

  The OLT 1 includes an MPCP control unit 11 that performs MPCP processing that is a message protocol for performing bandwidth control, an authentication server 12 that manages registration information and authentication information of the ONU 2 connected to the own device, and an LLID assigned to the ONU 2 An upstream bandwidth control unit 13 that manages an upstream bandwidth (communication bandwidth from the ONU 2 to the OLT 1), a packet filter 14 that outputs only user frames from the user terminal 6 that has been registered or authenticated, and an MPCP control unit 11 A packet buffer 15 that temporarily stores user packets received during communication with the MPCP control unit 21 of the ONU 2 using a control frame (MPCP message), and a PDS (Passive Double Star) terminal that controls signals in the PON section of optical transmission Part 10.

  The ONU 2 is assigned by the OLT 1 to the PDS termination unit 20 that controls the upstream optical transmission signal, the MPCP control unit 21 that processes the MPCP message received from the OLT 1, and the user terminal 6 that is registered and authenticated by the OLT 1 An upstream bandwidth control unit 22 that divides and allocates bandwidth fairly, a packet buffer 23 that buffers upstream user frames received from the user terminal 6, authentication information of the user terminal 6 connected to the own device, An authentication information management unit 24 that manages registration information, authentication information of the device itself, a packet filter 25 that discards user frames to the unauthenticated user terminal 6 and user frames that are not addressed to the device itself, and authentication information management MPCP control unit 21 via authentication control information input from unit 24 and packet filter 25 Based on the authentication status notifications et input, and a data multiplexing unit 26 for generating a registration request notification and registration permission notification.

  In addition to a general terminal function, the user terminal 6 includes an authentication information notification control unit 60 that notifies the ONU 2 of registration information including ID and identification information for identifying the terminal itself.

  Next, the operation of the communication system to which the bandwidth control method according to the present invention is applied will be described with reference to FIGS.

  First, the operation of the user registration authentication process for registering the user terminal 6 in the OLT 1 will be described with reference to the sequence diagram of FIG. The user registration authentication process is executed by communication between the MPCP control unit 11 of the OLT 1 and the MPCP control unit 21 of the ONU 2 using a control message.

  The authentication information notification control unit 60 of the user terminal 6 transmits registration information including terminal identification information for identifying the own terminal such as an ID, a MAC address, and an IP address to the ONU 2 and requests registration of the own terminal.

  The MPCP control unit 11 of the OLT 1 transmits to the ONU 2 a Gate message for confirming whether or not the ONU 2 and the user terminal 6 connected to the ONU 2 are registered at predetermined intervals. FIG. 3 shows a Gate message transmitted by the MPCP control unit 11 of the OLT 1. The Gate message is a GATE MPCPDU frame defined by IEEE 802.3ah, and includes a destination address (Destination Address), a source address (Source Address), a length / type (Length / Type), an OP code (Opcode), and a time stamp. (Timestamp), Grants number / flag (Number of grants / Flags), start time and length corresponding to Grants (Grant # 1 Start Time, Grant # 1 Length, Grant # 2 Start Time, Grant # 2 Length, Grant # 3 Start Time, Grant # 3 Length, Grant # 4 Start Time, Grant # 4 Length), Sync Time, Pad / Reserved, and FCS (Frame Check Sequence).

  When receiving the Gate message, the MPCP control unit 21 of the ONU 2 transmits a registration number update request (Register Request) to the OLT 1. FIG. 4 shows a control message for the registration number update request transmitted by the MPCP control unit 21 of the ONU 2. The control message for the registration number update request is a RETIGSTER_REQ MPCPDU frame defined by IEEE 802.3ah, and includes a destination address (Destination Address), a source address (Source Address), a length / type (Length / Type), an OP code ( Opcode), Timestamp, Flags, Pending grants, Pad / Reserved, and FCS (Frame Check Sequence).

  The MPCP control unit 21 of the ONU 2 registers the registration information of the user terminal 6 and the registered and authenticated user terminal 6 managed by the authentication information management unit 24 in the pad / reserve of the control message of the registration number update request shown in FIG. Is set and transmitted to the OLT 1. When the registration request is received from the user terminal 6 during the periodically received Gate message, the MPCP control unit 21 receives the registration information received as a registration request in the flag of the control message of the registration number update request, and the registration If the number of authenticated user terminals 6 is set and no registration request has been received, only the number of registered and authenticated user terminals 6 is set in the flag.

  The MPCP control unit 21 of the ONU 2 sends a registration number update request control message to the OTL 1 to notify the authentication information management unit 24 that the user terminal 6 has been registered. The authentication information management unit 24 notifies the data multiplexing unit 26 of authentication control information for notifying that a registration request has been made. The data multiplexing unit 26 generates a registration request notification based on the authentication control information and transmits it to the user terminal 6. Thereby, the authentication information notification control unit 60 of the user terminal 6 recognizes that the registration information transmitted by the own terminal has been accepted.

  On the other hand, the MPCP control unit 11 of the OLT 1 that has received the control message for the registration number update request includes the terminal identification information included in the registration information set in the flag of the control message for the registration number update request, and the registered and authenticated user terminal 6. And the registration number notification including the LLID for identifying the ONU 2 which is the transmission source of the control message of the registration number update request.

  The authentication server 12 of the OLT 1 determines whether to authenticate the user terminal 6 that requests registration based on the registration number notification. Specifically, the authentication server 12 associates the LLID assigned to the ONU 2 with the maximum number of user terminals 6 connected to the ONU 2 determined at the time of contracting and the bandwidth capacity (maximum bandwidth allocated to one user terminal 6). A registration management information table in which the number of registered user terminals, terminal identification information of the user terminal 6, authentication / non-authentication, and the like are registered. The authentication server 12 compares the maximum accommodation number corresponding to the LLID included in the registration number notification with the number of registered user terminals. Since the user terminal 6 can be authenticated when the maximum accommodation number is smaller than the number of registered user terminals, the authentication server 12 adds the identification information of the user terminal 6 to the registration management information as authenticated, and the registered user The registration management information table is updated by adding the number of terminals. If the maximum accommodation number is equal to the number of registered user terminals, the user terminal 6 cannot be authenticated. Therefore, the authentication server 12 adds the identification information of the user terminal 6 to the registration management information as non-authentication and registers it. Update the management information table.

  The authentication server 12 is information indicating whether or not the user terminal 6 notified by the registration number notification has been authenticated, that is, whether or not the user terminal 6 has been registered (registered and authenticated) as a terminal for determining a bandwidth to be allocated to an LLID described later. Notification of whether or not registration is possible is sent to the MPCP control unit 11.

  The MPCP control unit 11 of the OLT 1 transmits a control message of registration availability information (Register) including information on registration availability notification to the ONU 2. FIG. 5 shows a control message of registration availability information transmitted by the MPCP control unit 11 of the OLT 1. The control message of registration permission / inhibition information is a REGISTER MPCPDU frame that is a frame defined by IEEE 802.3ah, and includes a destination address (Destination Address), a source address (Source Address), a length / type (Length / Type), and OP. Code (Opcode), Timestamp, Asser Import (Assigned Port), Flag (Flags), Sync Time (Sync Time), Echoed Pending grants, Pad / Reserved (Pad / Reserved), And FCS.

  The MPCP control unit 11 of the OLT 1 sets registration enable / disable information indicating whether or not registration authentication has been performed in the flag of the control message of the registration enable / disable information shown in FIG.

  The MPCP control unit 21 of the ONU 2 notifies the authentication information management unit 24 of the registration enable / disable information of the flag of the received registration enable / disable information control message.

  The authentication information management unit 24 stores a registration authentication information table indicating whether or not registration authentication is performed in the OLT 1 in association with identification information of the user terminal 6 connected to the own device. The authentication information management unit 24 updates the registration authentication information table by adding information indicating whether or not the user terminal 6 has been registered and authenticated in the OLT 1 in association with the identification information of the user terminal 6 based on the registration availability information.

  The MPCP control unit 21 of the ONU 2 generates an authentication status notification indicating whether or not the user terminal 6 has been registered and authenticated with the OLT 1 based on the registration availability information, and outputs the notification to the data multiplexing unit 26 via the packet filter 25. The data multiplexing unit 26 generates a registration availability notification from the authentication status notification and transmits it to the user terminal 6. Thereby, the user terminal 6 recognizes whether or not the own terminal is registered and authenticated in the OLT 1.

  Next, the operation of bandwidth allocation processing in which the OLT 1 allocates bandwidth to the ONU 2 will be described. When it is time to transmit the Gate message, the MPCP control unit 11 outputs a bandwidth determination instruction for determining a bandwidth to be allocated to the ONU 2 to the upstream bandwidth control unit 13.

  The upstream bandwidth control unit 13 of the OLT 1 calculates the bandwidth allocated to the ONU 2 from the bandwidth capacity registered in the registration management information table of the authentication server 12 and the number of registered user terminals 6. Here, since the bandwidth capacity allocated to one user terminal 6 is registered, the allocated bandwidth allocated to the ONU 2 is calculated by “the number of registered user terminals × the bandwidth capacity allocated to one user terminal 6”. Can do. As described in the registration authentication process, since the number of registered user terminals is the maximum number of user terminals 6 that can be accommodated by the ONU 2, the bandwidth allocated to the ONU 2 is the bandwidth that can be allocated to the ONU 2. Never exceed capacity. The upstream bandwidth control unit 13 notifies the MPCP control unit 11 of the calculated bandwidth.

  The MPCP control unit 11 of the OLT 1 includes the allocated bandwidth calculated by the uplink bandwidth control unit 13 in the Gate message and transmits it to the ONU 2.

  The MPCP control unit 21 of the ONU 2 notifies the uplink bandwidth control unit 22 of the allocated bandwidth included in the Gate message. The upstream bandwidth control unit 22 stores the notified allocated bandwidth.

  Next, an operation in which the ONU 2 transmits the uplink user frame (layer 2 frame) received from the user terminal 6 to the OLT 1 will be described with reference to the flowchart of FIG. The packet buffer 23 receives and accumulates packets from the user terminal 6 via the terminal termination device 5.

  The authentication information management unit 24 extracts terminal identification information from the user frame stored in the packet buffer 23 (step S100). The authentication information management unit 24 searches the registration information table using the extracted terminal identification information as a search key, and determines whether or not the user frame stored in the packet buffer 23 is a user frame from the user terminal 6 registered in the OLT 1. Is notified to the packet buffer 23 (step S110). The authentication information management unit 24 notifies the upstream bandwidth control unit 22 of the number of registered user terminals 6 as the division number (step S120).

  If the packet buffer 23 has accumulated user frames determined to have been registered by the authentication information management unit 24, the packet buffer 23 notifies the upstream bandwidth control unit 22 that there is a user frame to be transmitted (step S130).

  The upstream bandwidth control unit 22 divides the bandwidth allocated from the OLT 1 by the number of divisions notified from the authentication information management unit 24, and determines the bandwidth allocated to each user terminal 6 managed by the own device (step S140). The upstream bandwidth control unit 22 reads out the frames from the same user terminal 6 accumulated in the packet buffer 23 by an amount corresponding to the determined bandwidth, and outputs it through the MPCP control unit 21 and the PDS termination unit 20 ( Step S150).

  The packet filter 14 of the OLT 1 outputs only the user frame from the user terminal 6 registered or authenticated by the authentication server 12.

  Next, an operation in which the ONU 2 transmits the user frame to the user terminal 6 received from the OLT 1 to the user terminal 6 will be described with reference to the flowchart of FIG. The packet buffer 15 of the OLT 1 determines whether or not the received user frame is a user frame addressed to the user terminal 6 registered in the authentication server 12, and only the registered user frame addressed to the user terminal 6 is MPCP. Transmission is performed via the control unit 11 and the PDS termination unit 10.

  The packet filter 25 accumulates user frames received via the PDS termination unit 20 and the MPCP control unit 21 (step S200). The authentication information management unit 24 extracts terminal identification information from the user frame stored in the packet filter 25 (step S210). The authentication information management unit 24 searches the registration information table using the extracted terminal identification information as a search key, and determines whether the user frame stored in the packet filter 25 is a user frame addressed to the user terminal 6 registered in the OLT 1 or not. Is determined (step S220).

  In the case of a user frame addressed to the registered user terminal 6, the authentication information management unit 24 outputs a transmission permission notification to the packet filter 25 (step S230). Upon receiving the transmission permission notification, the packet filter 25 transmits the accumulated user frame via the data multiplexing unit 26 (step S240). The transmitted user frame arrives at the user terminal 6 via the terminal termination device 5.

  On the other hand, if it is not a user frame addressed to the registered user terminal 6, the authentication information management unit 24 outputs a discard notification to the packet filter 25 (step S250). Upon receiving the discard notification, the packet filter 25 discards the accumulated user frame (step S260).

  As described above, in this embodiment, when the OLT 1 allocates a band for each LLID allocated to a plurality of ONUs 2 connected to the own apparatus, a band corresponding to the maximum accommodated number of user terminals 6 accommodated in the ONU 2 determined in advance. Is assigned to each ONU 2 according to the number of user terminals 6 accommodated in the ONU 2, and the ONU 2 divides the bandwidth allocated to the OLT 1 by the number of user terminals 6 accommodated by the own device. Since the user terminals 6 are allocated, even if the number of user terminals 6 accommodated by the ONU 2 exceeds the maximum capacity, the user terminals 6 accommodated by the ONU 2 without changing the bandwidth allocated for each LLID by the OLT 1. Therefore, it is possible to provide a service with guaranteed bandwidth to each user terminal 6.

  As described above, the bandwidth control method according to the present invention is useful for the Ethernet (registered trademark) PON system, and particularly for bandwidth control when the number of user terminals exceeding the maximum capacity is connected to the home terminal device. Is suitable.

It is a figure which shows the structure of the communication system by GE-PON to which the zone | band control method of this Embodiment concerning this invention is applied. It is a sequence diagram for demonstrating operation | movement of the registration authentication process of the communication system shown in FIG. It is a figure which shows the structure of the control message which OLT shown in FIG. 1 transmits. It is a figure which shows the structure of the control message which ONU shown in FIG. 1 transmits. It is a figure which shows the structure of the control message which OLT shown in FIG. 1 transmits. 3 is a flowchart for explaining the operation of the communication system shown in FIG. 1. 3 is a flowchart for explaining the operation of the communication system shown in FIG. 1.

Explanation of symbols

1 OLT
2 ONU
DESCRIPTION OF SYMBOLS 3 Optical fiber 4 Optical passive element 5 Terminal termination device 6 User terminal 10,20 PDS termination | terminus part 11,21 MPCP control part 12 Authentication server 13,22 Up-band control part 14,25 Packet filter 15,23 Packet buffer 24 Authentication information management Unit 26 data multiplexing unit 60 authentication information notification control unit

Claims (7)

A bandwidth control method for the plurality of user terminals in a communication system having a plurality of in-house terminal devices that accommodate a plurality of user terminals and a subscriber accommodation device that manages a bandwidth for each of the in-home terminal devices,
The user terminal is
Sending registration information including terminal identification information for identifying the terminal to the home terminal device to the home terminal device;
The in-home terminal device is
The plurality of user terminals accommodated by the own apparatus are managed by the terminal identification information included in the registration information, and the number of user terminals managed by the own apparatus and a registration number change request including the terminal identification information are transmitted to the subscriber accommodation apparatus. And the bandwidth allocated from the subscriber accommodation device is divided into the number of user terminals managed by the own device and assigned to each user terminal,
The subscriber accommodation device is:
Managing the plurality of in-house terminal devices connected to the own device based on the number of user terminals notified by the registration number change request and the terminal identification information, and user terminals accommodated by these in-home terminal devices, A bandwidth corresponding to the number of user terminals accommodated in the in-home terminal device is allocated to the plurality of in-home terminal devices, with an upper limit of a bandwidth corresponding to the maximum number of user terminals predetermined for each of the in-home terminal devices. thing,
A bandwidth control method characterized by the above. The subscriber accommodation device is:
Allocating a band according to the number of user terminals accommodated by the in-home terminal device based on a predetermined maximum bandwidth capacity or minimum bandwidth capacity to the plurality of in-home terminal devices;
The band control method according to claim 1.   3. The bandwidth control method according to claim 1, wherein an Ethernet (registered trademark) -PON system conforming to or conforming to the IEEE 802.3ah standard is used as the communication system. In a home terminal device that allocates a bandwidth allocated from a subscriber accommodation device to a plurality of user terminals accommodated by the device itself,
An authentication information management unit for managing the plurality of user terminals using terminal identification information for identifying user terminals included in registration information transmitted from the plurality of user terminals;
An MPDP control unit for transmitting a registration number change request including the number of user terminals managed by the authentication information management unit and the terminal identification information to the subscriber accommodation device;
An uplink bandwidth controller that divides the bandwidth allocated from the subscriber accommodation device into the number of user terminals managed by the authentication information manager and allocates the bandwidth to the plurality of user terminals;
An in-house terminal device comprising: In a subscriber accommodation device that allocates a band for each home terminal device that accommodates a plurality of user terminals,
Based on the registration number change request including the number of the plurality of user terminals and the terminal identification information for identifying the plurality of user terminals, the plurality of in-house terminal devices connected to the own device, and the in-house terminal devices An authentication server for managing user terminals to be accommodated;
Uplink for allocating a bandwidth corresponding to the number of user terminals managed by the authentication server to the plurality of home terminal devices, with an upper limit of a bandwidth corresponding to the maximum number of user terminals predetermined for each of the plurality of home terminal devices. A bandwidth controller;
An MPCP control unit that transmits information on the bandwidth allocated by the uplink bandwidth control unit to the plurality of home terminal devices, and receives the registration number change request from the plurality of home terminal devices;
A subscriber accommodation device comprising: The uplink bandwidth control unit
Allocating a band according to the number of user terminals accommodated in the in-home terminal device based on a predetermined maximum bandwidth capacity or a minimum bandwidth capacity to the plurality of in-home terminal devices;
The subscriber accommodation apparatus according to claim 5. In the user terminal accommodated in the home terminal device connected to the subscriber accommodation device,
An authentication information notification unit for transmitting registration information including terminal identification information for identifying the terminal itself to the in-home terminal device;
A user terminal comprising:

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