JP2012151557A - Communication device and band control method in communication device - Google Patents

Communication device and band control method in communication device Download PDF

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JP2012151557A
JP2012151557A JP2011007043A JP2011007043A JP2012151557A JP 2012151557 A JP2012151557 A JP 2012151557A JP 2011007043 A JP2011007043 A JP 2011007043A JP 2011007043 A JP2011007043 A JP 2011007043A JP 2012151557 A JP2012151557 A JP 2012151557A
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master station
bandwidth
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information
concentrator
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JP5634275B2 (en
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Yusuke Sakagami
佑介 坂上
Ryusuke Kawate
竜介 川手
Tetsuya Yokoya
哲也 横谷
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Mitsubishi Electric Corp
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Abstract

PROBLEM TO BE SOLVED: To solve a problem in which: when a PON and a layer 2 switch are viewed as one system, band allocation by a dynamic band allocation (DBA) and band control by output time scheduling are carried out independently, and thereby an optimal band control reflecting the status of both PON and layer 2 switch is not performed.SOLUTION: A communication device which achieves optimization of band control and power saving, and a band control method in the communication device are provided by coordinating a dynamic band allocation function (DBA) of a PON, and the band control function of a concentrator concentrating the PON, e.g. a layer 2 switch or a layer 3 switch.

Description

この発明は、ＰＯＮ(Passive Optical Network：受動的光ネットワーク)のユーザを収容する集線装置において、各ユーザに対して適切な帯域を割り当てる帯域保証および帯域制御を行う通信装置、および通信装置における帯域制御方法に関するものである。   The present invention relates to a concentrator that accommodates PON (Passive Optical Network) users, a communication device that performs bandwidth guarantee and bandwidth control for assigning an appropriate bandwidth to each user, and bandwidth control in the communication device. It is about the method.

従来、ＰＯＮの親局装置であるＯＬＴ(Optical Line Terminal)の上位にレイヤ２スイッチが配置され、ＰＯＮとレイヤ２スイッチは独立して動作し、それぞれ個別に、自身の入力と出力において帯域制御などを行っていた。   Conventionally, a layer 2 switch is arranged above the OLT (Optical Line Terminal), which is a PON master station device, and the PON and the layer 2 switch operate independently, and bandwidth control is performed individually at its own input and output. Had gone.

ＰＯＮのＤＢＡ(動的帯域割当機能：dynamic bandwidth allocation)では、ＰＯＮの子局装置であるＯＮＵ(Optical Network Unit)が自身(自ユーザ)の蓄積している上りデータ量を、ＯＬＴにＲＥＰＯＲＴフレームとして通知する。ＯＬＴはこのＯＮＵの蓄積データ量と他のＯＮＵの使用帯域から、このＯＮＵに与える上り帯域(ＯＮＵの上り送信開始時刻と送信量)を計算し、ＯＮＵに通知する(ＧＡＴＥフレーム)ことで、帯域要求が多いＯＮＵに多くの帯域を割り当てている。   In the PON DBA (dynamic bandwidth allocation function), the ONU (Optical Network Unit), which is the PON slave station device, stores the uplink data amount stored by itself (own user) as a REPORT frame in the OLT. Notice. The OLT calculates the upstream bandwidth (ONU upstream transmission start time and transmission amount) to be given to this ONU from the accumulated data amount of this ONU and the bandwidth used by other ONUs, and notifies the ONU (GATE frame). Many bandwidths are allocated to ONUs with many requests.

ユーザ毎の帯域割り当ての効率化を図ったシステムを開示した文献はいくつかあるが(例えば下記特許文献１−９参照)、ＰＯＮのＤＢＡ機能とレイヤ２スイッチの帯域制御機能とを連携させたものはない。   There are several documents that disclose a system that improves the efficiency of bandwidth allocation for each user (see, for example, Patent Documents 1 to 9 below), but the PON DBA function and the layer 2 switch bandwidth control function are linked. There is no.

特開２００１−１４８６７５号公報JP 2001-148675 A 特開２００２−３４４４６９号公報JP 2002-344469 A 特開２００４−９６５７９号公報JP 2004-96579 A 特開２００６−１０９０４７号公報JP 2006-109047 A 特開２００７−６０４３８号公報JP 2007-60438 A 特開２００７−３２９９７７号公報JP 2007-329977 A 特開２００８−１９９６３１号公報JP 2008-199631 A 特開２００８−２１９８９０号公報Japanese Patent Laid-Open No. 2008-21890 特開２００８−２８９２０２号公報JP 2008-289202 A

図８に示すように、ＰＯＮとレイヤ２スイッチを一つの系として見た場合、ＤＢＡによる帯域割り当てと、レイヤ２スイッチ内での出力時刻スケジューリングによる帯域制御は、それぞれが独立して制御されており、ＰＯＮとレイヤ２スイッチ双方の状態を反映した最適な帯域制御が行われていない。また、アクセス系(例えばユーザから電話局あるいはインターネット・プロバイダまでの間のネットワーク(WAN：Wide Area Network))における将来的な回線速度の増加により、１基のレイヤ２スイッチに収容するユーザ数が激増してしまうと、現行のレイヤ２スイッチで対応するためにはバッファ回路の増加、バッファＲＡＭチップの増加、レイヤ２スイッチ動作速度のクロックアップが求められることになり、消費電力が増大する。   As shown in FIG. 8, when the PON and the layer 2 switch are viewed as one system, the bandwidth allocation by the DBA and the bandwidth control by the output time scheduling in the layer 2 switch are controlled independently. The optimum bandwidth control reflecting the state of both the PON and the layer 2 switch is not performed. In addition, the number of users accommodated in a single layer 2 switch will increase dramatically due to the future increase in line speed in the access system (for example, a wide area network (WAN) from a user to a telephone office or Internet provider). Therefore, in order to cope with the current layer 2 switch, an increase in the buffer circuit, an increase in the buffer RAM chip, and a clock-up of the operation speed of the layer 2 switch are required, and the power consumption increases.

この発明は、上記の課題を解決するためになされたものであり、ＰＯＮの動的帯域割当機能(ＤＢＡ)と、ＰＯＮを集線する集線装置である例えばレイヤ２スイッチの帯域制御機能を連携させることで、帯域制御の最適化、省電力化を実現する通信装置および通信装置における帯域制御方法を提供することを目的とする。   The present invention has been made to solve the above-described problem, and links the PON dynamic bandwidth allocation function (DBA) with the bandwidth control function of, for example, a layer 2 switch that is a line concentrator that collects PON. Therefore, an object of the present invention is to provide a communication device and a bandwidth control method in the communication device that realizes optimization of band control and power saving.

この発明は、少なくとも１つの子局装置がそれぞれ接続された複数の親局機能手段と、前記複数の親局機能手段が接続された１つの集線手段とを備え、前記各親局機能手段は、接続された前記各子局装置からの上り蓄積データ量情報に従い前記各子局装置への動的帯域割当を行うと共に、前記各子局装置の前記上り蓄積データ量情報を合計した合計上り蓄積データ量情報を含む親局情報を前記集線手段へ送信し、前記集線手段は、接続された前記各親局機能手段からの前記親局情報に従い前記各親局機能手段のための帯域割当を計算し帯域制限情報として前記各親局機能手段へ送信し、前記各親局機能手段は、前記集線手段からの前記帯域制限情報の帯域割当の範囲以内になるように前記動的帯域割当で求めた帯域割当量を圧縮して前記各子局装置へ送信する、ことを特徴とする通信装置およびその帯域制御方法にある。   The present invention comprises a plurality of master station function means to which at least one slave station device is respectively connected, and a single concentrator means to which the plurality of master station function means are connected. Total uplink accumulation data obtained by performing dynamic bandwidth allocation to each slave station device according to the uplink accumulation data amount information from each connected slave station device and totaling the uplink accumulation data amount information of each slave station device The master station information including quantity information is transmitted to the concentrator, and the concentrator calculates a bandwidth allocation for each master station function means according to the master station information from each connected master station function means. The bandwidth limit information is transmitted to each of the master station function means, and each of the master station function means obtains the bandwidth determined by the dynamic bandwidth allocation so that it is within the bandwidth allocation range of the bandwidth limit information from the concentrator. Compress the allocated amount And transmits to the device, in a communication device and a bandwidth control method, characterized in that.

この発明では、ＰＯＮの動的帯域割当機能(ＤＢＡ)と、ＰＯＮを集線するレイヤ２スイッチの帯域制御機能を連携させ、レイヤ２スイッチに接続されたＰＯＮからレイヤ２スイッチへの出力帯域の合計が、レイヤ２スイッチの総出力帯域内に収まるようにＰＯＮからレイヤ２スイッチへの出力帯域を割り当てることで、帯域制御の最適化、省電力化が実現できる。   In this invention, the dynamic bandwidth allocation function (DBA) of the PON and the bandwidth control function of the layer 2 switch for concentrating the PON are linked so that the total output bandwidth from the PON connected to the layer 2 switch to the layer 2 switch is By allocating the output band from the PON to the layer 2 switch so as to be within the total output band of the layer 2 switch, optimization of band control and power saving can be realized.

この発明の一実施の形態による通信装置の構成の一例を示すブロック図である。It is a block diagram which shows an example of a structure of the communication apparatus by one embodiment of this invention. この発明の一実施の形態による通信装置の構成の別の例を示すブロック図である。It is a block diagram which shows another example of a structure of the communication apparatus by one embodiment of this invention. 図１および図２の通信装置における処理の流れを示す動作フローチャートである。3 is an operation flowchart illustrating a flow of processing in the communication device of FIGS. 1 and 2. この発明におけるレイヤ２スイッチ１つ、ＯＬＴ１つ、ＯＮＵ３つの構成の場合のＯＮＵ、ＯＬＴ、レイヤ２スイッチ間の信号送受のタイムチャートである。It is a time chart of signal transmission / reception between ONU, OLT, and layer 2 switch in the case of the configuration of one layer 2 switch, one OLT, and three ONUs in the present invention. この発明におけるレイヤ２スイッチ部分の動作を説明するための装置間の送受信信号を示す図である。It is a figure which shows the transmission / reception signal between apparatuses for demonstrating operation | movement of the layer 2 switch part in this invention. この発明におけるレイヤ２スイッチ部分の動作を説明するためのＯＬＴに割り当てる帯域の内訳を示す図である。It is a figure which shows the breakdown of the zone | band allocated to OLT for demonstrating operation | movement of the layer 2 switch part in this invention. この発明におけるレイヤ２スイッチ部分の動作を説明するための帯域割当方法を示す図である。It is a figure which shows the band allocation method for demonstrating operation | movement of the layer 2 switch part in this invention. 従来の課題を説明するための図である。It is a figure for demonstrating the conventional subject.

以下、この発明による通信装置および通信装置における帯域制御方法を実施の形態に従って図面を用いて説明する。なお、各図において、同一もしくは相当部分は同一もしくは相当する符号で示し、重複する説明は省略する。   Hereinafter, a communication apparatus and a bandwidth control method in the communication apparatus according to the present invention will be described with reference to the drawings according to embodiments. In each drawing, the same or corresponding parts are denoted by the same or corresponding reference numerals, and redundant description is omitted.

実施の形態１．
図１はこの発明の一実施の形態による通信装置の構成の一例を示すブロック図である。また、図２はこの発明の一実施の形態による通信装置の構成の別の例を示すブロック図である。図２では、ＰＯＮ(受動的光ネットワーク)のＯＬＴ(親局装置)とレイヤ２スイッチ(Ｌ２ＳＷ)とを１つの装置内に実装し、一体化した場合の構成を示している。 Embodiment 1 FIG.
FIG. 1 is a block diagram showing an example of the configuration of a communication apparatus according to an embodiment of the present invention. FIG. 2 is a block diagram showing another example of the configuration of the communication apparatus according to the embodiment of the present invention. FIG. 2 shows a configuration in which a PON (passive optical network) OLT (master station device) and a layer 2 switch (L2SW) are mounted and integrated in one device.

図１で示す例は、既存のＰＯＮを構成するＯＮＵ＃２−１〜２−ｎ(子局装置)と、レイヤ２スイッチＳＷとの連携機能を付加したＯＬＴ＃１〜ｍと、ＯＬＴ＃１〜ｍとの連携機能を付加したレイヤ２スイッチＳＷとで構成される。ＯＮＵ、ＯＬＴ、レイヤ２スイッチの各装置間の接続は従来通り、光ファイバケーブルまたは電気ケーブルからなる帯域制御が行われる伝送路による接続で、フレームの送受を行うことを想定する。なお、以下「伝送路」とは、通信の際のそれぞれの通信に対して送信開始時刻と送信量を設定して通信時間帯域制御を行う通信制御機能を有するものとする。   In the example shown in FIG. 1, ONTs # 2-1 to 2-n (slave station devices) constituting an existing PON, OLTs # 1 to m to which a cooperation function of layer 2 switch SW is added, and OLT # 1 And a layer 2 switch SW to which a cooperation function with .about.m is added. It is assumed that the connection between the ONU, OLT, and layer 2 switch devices is performed by transmission / reception of frames through a transmission path in which bandwidth control is performed using an optical fiber cable or an electric cable as usual. Hereinafter, the “transmission path” has a communication control function for performing communication time band control by setting a transmission start time and a transmission amount for each communication at the time of communication.

接続形態としては従来と同一であるが、ＯＬＴ＃１〜ｍとレイヤ２スイッチＳＷ間で制御フレームおよび帯域制御情報フレームの送受が行われる点が新規となる。ＯＬＴ＃１〜ｍとレイヤ２スイッチＳＷ間の制御フレームには、例えばＯＬＴ＃２であれば、ＯＬＴ＃２に接続されているＯＮＵ＃２−１〜２−ｎ等に蓄積されたデータ量(上り蓄積データ量)と、各ユーザに割り当てられた最低保証帯域の情報がコンテナされる。なお、この各ユーザへの最低保証帯域がもともと設定されていない通信システムの通信装置の場合には最低保証帯域は考慮されない。   Although the connection form is the same as the conventional one, it is new that a control frame and a band control information frame are transmitted and received between the OLT # 1 to m and the layer 2 switch SW. In the control frame between the OLT # 1 to m and the layer 2 switch SW, for example, in the case of OLT # 2, the amount of data stored in the ONUs # 2-1 to 2-n connected to the OLT # 2 ( Upstream accumulated data amount) and minimum guaranteed bandwidth information allocated to each user are containerized. Note that the minimum guaranteed bandwidth is not considered in the case of a communication apparatus of a communication system in which the minimum guaranteed bandwidth for each user is not originally set.

図２で示す例は、既存のＰＯＮを構成するＯＮＵ＃２−１〜２−ｎと、ＯＬＴ機能を内蔵したレイヤ２スイッチまたはレイヤ２スイッチ機能を内蔵したＯＬＴである例えばＯＬＴ内蔵レイヤ２スイッチ１００によって構成される。ＯＬＴ内蔵レイヤ２スイッチ１００内のレイヤ２スイッチ機能部ＳＷａと各ＯＬＴ機能部＃１ａ〜ｍａは装置内接続となるため、制御信号類の送受を主信号系と分離する構成とし、制御信号(後述する親局情報)、および帯域制限情報をデータ用の主信号線ＭＬとは異なる制御信号線ＣＬを用いて送受する。これらの「主信号線ＭＬ」および「制御信号線ＣＬ」は上記帯域制御等の通信制御機能は有しない。   The example shown in FIG. 2 is an ONU # 2-1 to 2-n constituting an existing PON and a layer 2 switch incorporating an OLT function or an OLT incorporating a layer 2 switch function. For example, an OLT built-in layer 2 switch 100 Consists of. Since the layer 2 switch function unit SWa in the OLT built-in layer 2 switch 100 and each of the OLT function units # 1a to ma are connected within the apparatus, transmission and reception of control signals are separated from the main signal system, and control signals (described later) Master station information) and band limitation information are transmitted and received using a control signal line CL different from the main signal line ML for data. These “main signal line ML” and “control signal line CL” do not have communication control functions such as band control.

図１の構成との違いとして、専用信号線によって情報の送受を行うため、各ＯＬＴ機能部１ａ〜ｍａからそれぞれに接続された各ＯＮＵに蓄積されたデータ量と、各ＯＮＵの各ユーザに割り当てられた最低保証帯域の情報をそれぞれレイヤ２スイッチ機能部ＳＷａに伝達する。主信号(データフレーム)の間に信号フレームを割り込ませる図１の構成に比べて、信号遅延が少なく、主信号への割り込みが無いために主信号のデータレートにも影響が無い。   The difference from the configuration of FIG. 1 is that information is transmitted and received through a dedicated signal line, so that the amount of data stored in each ONU connected to each of the OLT function units 1a to ma is allocated to each user of each ONU. Each of the guaranteed minimum bandwidth information is transmitted to the layer 2 switch function unit SWa. Compared with the configuration of FIG. 1 in which a signal frame is interrupted between main signals (data frames), there is less signal delay and there is no interruption to the main signal, so there is no effect on the data rate of the main signal.

以下では、「ＯＬＴ」(親局機能手段)は図１におけるＯＬＴ＃１〜ｍおよび図２におけるＯＬＴ内蔵レイヤ２スイッチ１００におけるＯＬＴ機能部１ａ〜ｍａの双方を指し、同様に「レイヤ２スイッチ」(集線手段)はレイヤ２スイッチＳＷおよびＯＬＴ内蔵レイヤ２スイッチ１００におけるレイヤ２スイッチ機能部ＳＷａの双方を指す言葉として使用する。   In the following, “OLT” (master station function means) refers to both OLT # 1 to m in FIG. 1 and OLT function units 1a to ma in the OLT built-in layer 2 switch 100 in FIG. (Concentration means) is used as a term indicating both the layer 2 switch SW and the layer 2 switch function unit SWa in the OLT built-in layer 2 switch 100.

図３は図１および図２の通信装置における処理の流れを示す動作フローチャートである。最初に、従来技術のＤＢＡと同様に、各ＯＮＵからそれぞれに蓄積されている上り蓄積データ量を記したＲＥＰＯＲＴフレームが接続されているＯＬＴに送信され、ＯＬＴがこのＲＥＰＯＲＴフレームを受信する(Ｓ１)。次に、ＯＬＴは一旦従来通りに自身に接続された各ＯＮＵからの上り蓄積データ量に従い各ＯＮＵへの帯域(ＯＮＵの上り送信開始時刻と送信量)の動的帯域割当計算を実行する。ここまでは従来通りの制御方法となるが、この計算によって割り当てられた帯域情報をＯＮＵへＧＡＴＥフレームとして通知することを保留する点が従来と異なる。   FIG. 3 is an operation flowchart showing a flow of processing in the communication apparatus of FIGS. First, similar to the DBA of the prior art, a REPORT frame indicating the amount of uplink stored data stored in each ONU is transmitted to the connected OLT, and the OLT receives this REPORT frame (S1). . Next, the OLT executes dynamic bandwidth allocation calculation of the bandwidth (ONU upstream transmission start time and transmission amount) to each ONU according to the amount of upstream accumulated data from each ONU connected to itself once as usual. Up to this point, the conventional control method is used, but the point that the bandwidth information allocated by this calculation is suspended as a GATE frame is different from the conventional method.

ＯＬＴは、上記の動的帯域割当計算と並行して、自身に接続されたＯＮＵからのＲＥＰＯＲＴフレームから各ＯＮＵの上り蓄積データ量を集計し、これを合計した合計上り蓄積データ量を合計上り蓄積データ量として、各ＯＮＵの各ユーザに対して設定されている最低保証帯域の合計と共に、レイヤ２スイッチに制御フレーム(図１の場合)または制御信号(図２の場合)を送信する(Ｓ２)。ＯＬＴは、ユーザに設定された最低保証帯域を、例えばＯＮＵ単位で合計したものを記憶部(図示省略)に予め格納しており、ＯＮＵ単位の最低保証帯域をさらに合計する(合計最低保証帯域情報)。なお、合計上り蓄積データ量と合計最低保証帯域を親局情報とする。   In parallel with the dynamic bandwidth allocation calculation described above, the OLT totals the upstream accumulated data amount of each ONU from the REPORT frame from the ONU connected to the OLT, and totaled the accumulated upstream accumulated data amount. As a data amount, a control frame (in the case of FIG. 1) or a control signal (in the case of FIG. 2) is transmitted to the layer 2 switch together with the total guaranteed minimum bandwidth set for each user of each ONU (S2). . The OLT stores the minimum guaranteed bandwidth set by the user in advance in, for example, the ONU unit in a storage unit (not shown), and further sums the minimum guaranteed bandwidth in ONU units (total minimum guaranteed bandwidth information). ). The total uplink accumulated data amount and the total minimum guaranteed bandwidth are set as parent station information.

ＯＬＴからの制御フレームまたは制御信号(親局情報)を受け取ったレイヤ２スイッチでは、自身に接続された１つ以上のＯＬＴまたは全ＯＬＴからの合計上り蓄積データ量および合計最低保証帯域を集計し、自身に接続されたそれぞれのＯＬＴに対して帯域を割り当てる計算を実行し(Ｓ３)、この結果を帯域制限情報として各ＯＬＴに送信する(Ｓ３)。ここでの計算内容は後述する。帯域制限情報は、ＯＬＴの出力帯域の最大値を含む。   In the layer 2 switch that has received the control frame or control signal (master station information) from the OLT, the total uplink accumulated data amount and the total minimum guaranteed bandwidth from one or more OLTs or all OLTs connected to the OLT are aggregated, A calculation for allocating a bandwidth to each OLT connected to itself is executed (S3), and the result is transmitted to each OLT as bandwidth limitation information (S3). The calculation contents here will be described later. The band limitation information includes the maximum value of the output band of the OLT.

ＯＬＴは、従来通りに計算した自身に接続されたＯＮＵへの動的帯域割当計算結果をＯＮＵに送らずに保留していることは前述したが、ＯＬＴがレイヤ２スイッチから受信した帯域制限情報を元に、前述の計算結果全体に対して、ＯＬＴに接続されたＯＮＵに対する帯域割当の合計がレイヤ２スイッチから受け取った帯域制限情報の帯域制限の範囲内に収まる(範囲以内になる)ように、各ＯＮＵへの帯域割当量を圧縮する(Ｓ５)。各ＯＮＵへの帯域割当の比は変わらない。この圧縮された結果(修正帯域割当量)を、接続された各ＯＮＵにＧＡＴＥフレームとして送信する(Ｓ５)。ＧＡＴＥフレームの内容、およびＯＬＴとＯＮＵの制御方法は従来通りである。   As described above, the OLT holds the calculation result of the dynamic bandwidth allocation to the ONU connected to itself without being sent to the ONU, but the bandwidth limitation information received from the layer 2 switch by the OLT is described above. Originally, for the entire calculation result described above, the total bandwidth allocation for ONUs connected to the OLT is within the range of the bandwidth limit of the bandwidth limit information received from the layer 2 switch (within the range). The bandwidth allocation amount to each ONU is compressed (S5). The ratio of bandwidth allocation to each ONU does not change. The compressed result (corrected bandwidth allocation amount) is transmitted as a GATE frame to each connected ONU (S5). The contents of the GATE frame and the control method of the OLT and ONU are the same as before.

その後、各ＯＮＵは送信された修正帯域割当量に従って、ＲＥＰＯＲＴフレームで送信要求を送信した後、データをＤＡＴＡフレームで送信する(Ｓ７)。最終的な出力での帯域から割り当て量を計算するため、この工程を経てＯＵＮから送信したデータは、後段においても溢れないため、レイヤ２スイッチにおけるバッファは、到着フレームの競合制御に必要な分だけ設ければよい。   Thereafter, each ONU transmits a transmission request with a REPORT frame according to the transmitted corrected bandwidth allocation amount, and then transmits data with a DATA frame (S7). Since the allocation amount is calculated from the bandwidth at the final output, the data transmitted from the OUN through this process does not overflow even in the subsequent stage. Therefore, the buffer in the layer 2 switch is only necessary for the contention control of the arrival frame. What is necessary is just to provide.

図４はレイヤ２スイッチ１つ、ＯＬＴ１つ、ＯＮＵ３つの構成の場合のＯＮＵ、ＯＬＴ、レイヤ２スイッチ間の信号送受のタイムチャートである。図４においてＲ１〜Ｒ３はＯＬＴ＃１に接続されているＯＮＵ＃１−１〜ＯＮＵ＃１−３が所定期間内に送信したＲＥＰＯＲＴフレーム(上り蓄積データ量情報含む)であり、Ｃ１〜Ｃ３はＯＬＴ＃１〜ＯＬＴ＃３(ＯＬＴ＃１のみ図示)が別の所定期間内にレイヤ２スイッチに送信した制御フレーム(合計上り蓄積データ量情報、合計最低保証出力帯域からなる親局情報を含む)であり、Ｌ１〜Ｌ３はレイヤ２スイッチからＯＬＴ＃１〜＃３に送信される帯域制御情報フレーム(帯域制限情報を含む)であり、Ｇ１〜Ｇ３はＯＬＴ＃１からＯＮＵ＃１〜ＯＮＵ＃３へ送信されるＧＡＴＥフレーム(修正帯域割当量を含む)である。   FIG. 4 is a time chart of signal transmission / reception between the ONU, the OLT, and the layer 2 switch in the case of the configuration of one layer 2 switch, one OLT, and three ONUs. In FIG. 4, R1 to R3 are REPORT frames (including uplink accumulated data amount information) transmitted by ONU # 1-1 to ONU # 1-3 connected to OLT # 1 within a predetermined period. Control frames transmitted by OLT # 1 to OLT # 3 (only OLT # 1 is shown) to the layer 2 switch within another predetermined period (including total uplink accumulated data amount information and master station information including total minimum guaranteed output bandwidth) L1 to L3 are bandwidth control information frames (including bandwidth limitation information) transmitted from the layer 2 switch to OLT # 1 to # 3, and G1 to G3 are OLT # 1 to ONU # 1 to ONU # 3. GATE frame (including the corrected bandwidth allocation amount) transmitted to

図１で示すように各ＯＬＴとレイヤ２スイッチが別装置である場合、各ＯＮＵと対応するＯＬＴの間、およびＯＬＴとレイヤ２スイッチの間がそれぞれ伝送路で接続され、それぞれの間で伝送路を介してデータと共に信号フレームにより信号の送信が行われる。
各ＯＬＴは、所定期間の間に各ＯＮＵから受信した上り蓄積データ量情報の信号フレームの内容を合計した合計上り蓄積データ量情報と格納された最低保証帯域の合計最低保証帯域を含む親局情報の信号フレームをレイヤ２スイッチに送信する。
レイヤ２スイッチは、別の所定期間の間に各ＯＬＴから受信した親局情報の信号フレームの内容に従い各ＯＬＴのための帯域割当を計算し帯域制限情報の信号フレームとして各ＯＬＴへ送信する。 As shown in FIG. 1, when each OLT and the layer 2 switch are separate devices, each ONU and the corresponding OLT, and between the OLT and the layer 2 switch are connected by a transmission line, respectively. The signal is transmitted by the signal frame together with the data via.
Each OLT includes master station information including total uplink accumulated data amount information obtained by summing up the contents of signal frames of uplink accumulated data amount information received from each ONU during a predetermined period and the total minimum guaranteed bandwidth of the stored minimum guaranteed bandwidth. Are transmitted to the layer 2 switch.
The layer 2 switch calculates the bandwidth allocation for each OLT according to the contents of the signal frame of the master station information received from each OLT during another predetermined period, and transmits it to each OLT as a signal frame of the bandwidth limitation information.

一方、図２で示すように各ＯＬＴとレイヤ２スイッチが同一装置内に実装されている場合、各ＯＮＵと対応するＯＬＴ機能部の間がそれぞれ伝送路で接続され、伝送路を介してデータと共に信号フレームにより信号の送信が行われ、各ＯＬＴ機能部とレイヤ２スイッチ機能部の間がそれぞれデータを伝送する主信号線ＭＬと制御用信号を送信する制御信号線ＣＬで接続され、親局情報、帯域制限情報が制御用信号として送信される。
各ＯＬＴ機能部は、所定時間の間に各ＯＮＵから受信した上り蓄積データ量情報の信号フレームの内容を合計した合計上り蓄積データ量情報と格納された最低保証帯域の合計最低保証帯域を含む親局情報の制御信号をレイヤ２スイッチ機能部に送信する。
レイヤ２スイッチ機能部は、別の所定期間の間に各ＯＬＴ機能部から受信した親局情報の制御信号に従い各ＯＬＴ機能部のための帯域割当を計算し帯域制限情報の制御信号として各ＯＬＴ機能部へ送信する。 On the other hand, when each OLT and the layer 2 switch are mounted in the same device as shown in FIG. 2, each ONU and the corresponding OLT function unit are connected by a transmission path, and together with the data via the transmission path. Signal transmission is performed by a signal frame, and each OLT function unit and the layer 2 switch function unit are connected by a main signal line ML for transmitting data and a control signal line CL for transmitting a control signal, respectively. The band limit information is transmitted as a control signal.
Each OLT function unit is a parent that includes total uplink accumulated data amount information obtained by adding up the contents of signal frames of uplink accumulated data amount information received from each ONU during a predetermined time and a total minimum guaranteed bandwidth of the stored minimum guaranteed bandwidth. A control signal of station information is transmitted to the layer 2 switch function unit.
The layer 2 switch function unit calculates the bandwidth allocation for each OLT function unit according to the control signal of the master station information received from each OLT function unit during another predetermined period, and uses each OLT function as a control signal of the band limit information. To the department.

次に、レイヤ２スイッチで行う制御の内容を説明する。各装置(機能部)間で送受される信号の内容を図５に示す。レイヤ２スイッチは各ＯＬＴからＲＥＰＯＲＴフレームの集計結果として、各ＯＬＴに接続されたＯＮＵにバッファされている送信待ちデータ量の合計(合計上り蓄積データ量)と、ＯＬＴで保持している各ユーザに設定されている最低帯域保証の合計(合計最低保証帯域)を受け取る。レイヤ２スイッチは、１つ以上のＯＬＴまたは全ＯＬＴからの上記情報を総合し、総帯域量がレイヤ２スイッチ自身の総出力帯域に収まる(帯域以内になる)ように、各ＯＬＴ毎の出力帯域を決定する。   Next, the contents of control performed by the layer 2 switch will be described. FIG. 5 shows the contents of signals transmitted and received between the devices (functional units). As a result of counting the REPORT frames from each OLT, the layer 2 switch determines the total amount of data waiting to be transmitted (total amount of uplink accumulated data) buffered in the ONU connected to each OLT and each user stored in the OLT. Receives the total guaranteed minimum bandwidth (total minimum guaranteed bandwidth). The layer 2 switch combines the above information from one or more OLTs or all OLTs, and the output bandwidth for each OLT so that the total bandwidth amount is within the total output bandwidth of the layer 2 switch itself (within the bandwidth). To decide.

図６は、上記状況においてレイヤ２スイッチが、各ＯＬＴに出力帯域を割り当てる計算を行う際の、計算結果における帯域の内訳を表したものである。最終的に各ＯＮＵに割り当てられる帯域の内、最低保証帯域は常に保証される帯域で、固定割り当てとなる。レイヤ２スイッチの総出力帯域から、全ユーザに設定された最低保証帯域分を差し引いた余剰帯域が、動的に各ＯＬＴに対して割当帯域として割り当てられる。図７に示すように、割当量は、各ＯＬＴから受け取った、該ＯＬＴに接続されたＯＮＵの送信要求データ量すなわち上り蓄積データ量の合計を集計し、この比率をもって上記した余剰帯域を割り付けたものが、各ＯＬＴの出力帯域割当分となる。   FIG. 6 shows a breakdown of the band in the calculation result when the layer 2 switch performs calculation to allocate the output band to each OLT in the above situation. Of the bandwidths finally assigned to each ONU, the minimum guaranteed bandwidth is always guaranteed and is fixedly assigned. A surplus bandwidth obtained by subtracting the minimum guaranteed bandwidth set for all users from the total output bandwidth of the layer 2 switch is dynamically allocated to each OLT as an allocated bandwidth. As shown in FIG. 7, the allocated amount is the total of the transmission request data amount of the ONUs connected to the OLT received from each OLT, that is, the total amount of uplink accumulated data, and the above-described surplus bandwidth is allocated with this ratio. What is the output bandwidth allocation of each OLT.

図７は、レイヤ２スイッチが、自身に接続された各ＯＬＴに対して出力帯域を割り当てる方法について説明するための図である。ＯＬＴとレイヤ２スイッチの接続数にも左右されるが、基本的に全ＯＬＴの出力可能帯域合計はレイヤ２スイッチの出力可能帯域を上回るものとする。全ＯＬＴが自身の出力可能帯域を全て使い切ってレイヤ２スイッチにフレームを流した場合、レイヤ２スイッチにおいて溢れたフレームをドロップする必要があるが、レイヤ２スイッチの出力可能帯域を限界として各ＯＬＴの出力帯域を絞ることで、溢れて無駄となるフレームを最小限に抑えることができる。レイヤ２スイッチにおけるＯＬＴ出力帯域制御は、レイヤ２スイッチの総出力帯域から図６に示した最低帯域保証を除いた分を各ＯＬＴの出力帯域の合計とし、各ＯＬＴから受け取った制御フレーム、制御信号に記された各ＯＮＵの送信要求データ量(合計上り蓄積データ量情報)の割合をもって、各ＯＬＴの出力帯域を割り当てる。   FIG. 7 is a diagram for explaining a method in which the layer 2 switch allocates an output band to each OLT connected to itself. Although it depends on the number of connections between the OLT and the layer 2 switch, basically, the total outputable bandwidth of all OLTs exceeds the outputable bandwidth of the layer 2 switch. When all OLTs use their own output available bandwidth and flow frames to the layer 2 switch, it is necessary to drop the overflow frame in the layer 2 switch. However, with the limit of the output available bandwidth of the layer 2 switch, By narrowing the output bandwidth, it is possible to minimize the overflowing and wasted frames. The OLT output bandwidth control in the layer 2 switch is obtained by subtracting the minimum bandwidth guarantee shown in FIG. 6 from the total output bandwidth of the layer 2 switch as the sum of the output bandwidth of each OLT, and the control frame and control signal received from each OLT The output bandwidth of each OLT is assigned with the ratio of the transmission request data amount (total uplink accumulated data amount information) of each ONU described in (1).

なお、ユーザへの最低保証帯域の設定がない通信装置の場合には、各ＯＬＴは親局情報として合計上り蓄積データ量を送信し、レイヤ２スイッチでは、各ＯＬＴからの合計上り蓄積データ量情報の割合をもって、かつ総帯域量がレイヤ２スイッチ自身の総出力帯域に収まる(帯域以内になる)ように、各ＯＬＴの出力帯域を割り当てればよい。   Note that in the case of a communication device in which the minimum guaranteed bandwidth is not set for the user, each OLT transmits the total uplink accumulated data amount as parent station information, and the layer 2 switch has the total uplink accumulated data amount information from each OLT. And the output bandwidth of each OLT may be allocated so that the total bandwidth amount is within the total output bandwidth of the layer 2 switch itself (within the bandwidth).

また、上記実施の形態ではレイヤ２スイッチの場合について説明したが、ＰＯＮの動的帯域割当機能(ＤＢＡ)と、ＰＯＮを集線する集線装置であるレイヤ３スイッチの帯域制御機能を同様にして連携させるようにしても、同様に実施可能であり、同様な効果を奏する。   In the above embodiment, the case of the layer 2 switch has been described. However, the PON dynamic bandwidth allocation function (DBA) and the bandwidth control function of the layer 3 switch which is a line concentrator for collecting PONs are linked in the same manner. Even if it does, it can implement similarly, and there exists the same effect.

以上のようにこの発明によれば、アクセス系におけるＰＯＮのＤＢＡとレイヤ２スイッチ、レイヤ３スイッチの帯域制御機能とを連携させることで、廃棄フレームの削減やネットワーク端末のバッファの有効利用など、通信システム内の伝送路上の伝送速度の最適化を図ることができ、従来のレイヤ２スイッチ、レイヤ３スイッチの帯域制御機能を実装する上で必要であった大規模なバッファ回路を大きく削減することが可能となる。これにより、データ伝送の効率化、および消費電力の低減を実現できる。   As described above, according to the present invention, the PON DBA in the access system and the bandwidth control function of the layer 2 switch and the layer 3 switch are linked to reduce the number of discarded frames and to effectively use the buffer of the network terminal. The transmission speed on the transmission line in the system can be optimized, and the large-scale buffer circuit necessary for implementing the bandwidth control function of the conventional layer 2 switch and layer 3 switch can be greatly reduced. It becomes possible. Thereby, the efficiency of data transmission and the reduction of power consumption can be realized.

１，２，３，…，ｍ ＯＬＴ(親局機能手段)、１ａ，２ａ，３ａ，…，ｍａ ＯＬＴ機能部(親局機能手段)、２−１，２−２，…，２−ｎ ＯＮＵ、ＳＷ レイヤ２スイッチ(集線手段)、ＳＷａ レイヤ２スイッチ機能部(集線手段)、１００ ＯＬＴ内蔵レイア２スイッチ、ＣＬ 制御信号線、ＭＬ 主信号線。   1, 2, 3, ..., m OLT (master station function means), 1a, 2a, 3a, ..., ma OLT function section (master station function means), 2-1, 2-2, ..., 2-n ONU SW layer 2 switch (concentration means), SWa layer 2 switch function unit (concentration means), 100 OLT built-in layer 2 switch, CL control signal line, ML main signal line.

Claims (11)

少なくとも１つの子局装置がそれぞれ接続された複数の親局機能手段と、前記複数の親局機能手段が接続された１つの集線手段とを備え、
前記各親局機能手段は、接続された前記各子局装置からの上り蓄積データ量情報に従い前記各子局装置への動的帯域割当を行うと共に、前記各子局装置の前記上り蓄積データ量情報を合計した合計上り蓄積データ量情報を含む親局情報を前記集線手段へ送信し、
前記集線手段は、接続された前記各親局機能手段からの前記親局情報に従い前記各親局機能手段のための帯域割当を計算し帯域制限情報として前記各親局機能手段へ送信し、
前記各親局機能手段は、前記集線手段からの前記帯域制限情報の帯域割当の範囲以内になるように前記動的帯域割当で求めた帯域割当量を圧縮して前記各子局装置へ送信する、
ことを特徴とする通信装置。 A plurality of master station function means to which each of at least one slave station device is connected; and one concentrator means to which the plurality of master station function means are connected;
Each master station function means performs dynamic bandwidth allocation to each slave station device according to uplink stored data amount information from each connected slave station device, and the uplink stored data amount of each slave station device Sending the master station information including the total uplink accumulated data amount information totaled information to the concentrator,
The line concentrator calculates a bandwidth allocation for each master station function means according to the master station information from each connected master station function means and transmits the bandwidth allocation information to each master station function means,
Each master station function unit compresses the bandwidth allocation amount obtained by the dynamic bandwidth allocation so as to be within the range of the bandwidth allocation of the bandwidth limitation information from the concentrator, and transmits the compressed bandwidth allocation amount to each slave station device ,
A communication device. 前記集線手段が、接続された前記各親局機能手段からの前記親局情報を集計し、総帯域量が前記集線手段の総出力帯域以内になるように前記各親局機能手段の帯域割当量を割り当てることを特徴とする請求項１に記載の通信装置。   The concentrator collects the master station information from each connected master station function means, and the bandwidth allocation amount of each master station function means so that the total bandwidth is within the total output bandwidth of the concentrator means The communication device according to claim 1, wherein the communication device is assigned. 前記各親局機能手段は、接続されている前記各子局装置に関する最低保証帯域を予め記憶部に格納し、前記最低保証帯域を合計した合計最低保証帯域を前記合計上り蓄積データ量情報と共に前記親局情報として送信し、
前記集線手段は、前記各親局機能手段からの合計上り蓄積データ量情報と合計最低保証帯域を含む前記親局情報に従い帯域割当を行い、前記合計最低保証帯域を前記集線手段の出力帯域の中の固定帯域として割り当て、出力帯域の余剰帯域を動的帯域とし、前記各親局機能手段に対して、前記合計最低保証帯域に従って最低保証帯域を割り当てると共に、前記動的帯域を前記合計上り蓄積データ量情報の比率に従って割当領域として割り当てることを特徴とする請求項２に記載の通信装置。 Each master station function means stores in advance a minimum guaranteed bandwidth for each connected slave station device in a storage unit, and sums the minimum guaranteed bandwidth together with the total uplink accumulated data amount information. Send as master station information,
The concentrator performs bandwidth allocation according to the master station information including the total uplink stored data amount information from each master station function unit and the total minimum guaranteed bandwidth, and the total minimum guaranteed bandwidth is included in the output bandwidth of the concentrator. And a surplus bandwidth of the output bandwidth as a dynamic bandwidth, assigning a minimum guaranteed bandwidth according to the total minimum guaranteed bandwidth to each master station function means, and assigning the dynamic bandwidth to the total uplink accumulated data The communication apparatus according to claim 2, wherein the communication apparatus is allocated as an allocation area according to a ratio of the quantity information. 前記各子局装置と前記親局機能手段の間、および前記各親局機能手段と前記集線手段の間がそれぞれ伝送路で接続され、それぞれの間で前記伝送路を介してデータと共に信号フレームにより信号の送信が行われることを特徴とする請求項１から３のいずれか１項に記載の通信装置。   Each slave station device and the master station function means, and each master station function means and the concentrator means are connected by a transmission path, and between each of them by a signal frame together with data via the transmission path. 4. The communication apparatus according to claim 1, wherein signal transmission is performed. 前記各親局機能手段と前記集線手段を別装置とし、前記各親局機能手段が、第１の所定期間の間に前記各子局装置から受信した前記上り蓄積データ量情報の信号フレームの内容を合計した合計上り蓄積データ量情報を含む親局情報の信号フレームを前記集線手段に送信することを特徴とする請求項４に記載の通信装置。   Each master station function means and the concentrator means are separate devices, and the contents of the signal frame of the uplink accumulated data amount information received by each master station function means from each slave station device during a first predetermined period 5. The communication apparatus according to claim 4, wherein a signal frame of parent station information including total uplink accumulated data amount information obtained by totaling the data is transmitted to the concentrator. 前記集線手段が、第２の所定期間の間に前記各親局機能手段から受信した前記親局情報の信号フレームの内容に従い前記各親局機能手段のための帯域割当を計算し帯域制限情報の信号フレームとして前記各親局機能手段へ送信することを特徴とする請求項４または５に記載の通信装置。   The line concentrator calculates a bandwidth allocation for each master station function means according to the content of the signal frame of the master station information received from each master station function means during a second predetermined period, and 6. The communication apparatus according to claim 4, wherein the communication apparatus transmits the signal frame to each of the master station function means. 前記各子局装置と前記親局機能手段の間がそれぞれ伝送路で接続され、前記伝送路を介してデータと共に信号フレームにより信号の送信が行われ、
前記各親局機能手段と前記集線手段の間がそれぞれデータを伝送する主信号線と制御用信号を送信する制御信号線で接続され、前記親局情報、帯域制限情報が前記制御用信号として送信される、
ことを特徴とする請求項１から３のいずれか１項に記載の通信装置。 Each slave station device and the master station function means are each connected by a transmission line, and a signal is transmitted by a signal frame together with data through the transmission line,
The master station function means and the concentrator are connected by a main signal line that transmits data and a control signal line that transmits a control signal, respectively, and the master station information and band limit information are transmitted as the control signal. To be
The communication device according to any one of claims 1 to 3, wherein 前記各親局機能手段と前記集線手段を同一装置内に実装し、前記各親局機能手段が、第１の所定時間の間に前記各子局装置から受信した前記上り蓄積データ量情報の信号フレームの内容を合計した合計上り蓄積データ量情報を含む親局情報の制御信号を前記集線手段に送信することを特徴とする請求項７に記載の通信装置。   Each of the master station function means and the concentrating means are mounted in the same device, and each master station function means receives the signal of the uplink accumulated data amount information received from each of the slave station devices during a first predetermined time. 8. The communication apparatus according to claim 7, wherein a control signal of master station information including total uplink accumulated data amount information obtained by summing up the contents of frames is transmitted to the concentrator. 前記集線手段が、第２の所定期間の間に前記各親局機能手段から受信した前記親局情報の制御信号に従い前記各親局機能手段のための帯域割当を計算し帯域制限情報の制御信号として前記各親局機能手段へ送信することを特徴とする請求項７または８に記載の通信装置。   The line concentrator calculates a bandwidth allocation for each of the master station function means according to the control signal of the master station information received from each of the master station function means during the second predetermined period, and controls the bandwidth limitation information. The communication apparatus according to claim 7 or 8, wherein the communication apparatus transmits to each of the master station function means. 前記集線手段がレイヤ２スイッチまたはレイア３スイッチを機能を有するか、またはレイヤ２スイッチまたはレイア３スイッチからなる請求項１から９までのいずれか１項に記載の通信装置。   The communication device according to any one of claims 1 to 9, wherein the line concentrator has a function of a layer 2 switch or a layer 3 switch, or includes a layer 2 switch or a layer 3 switch. 少なくとも１つの子局装置がそれぞれ接続された複数の親局機能手段と、前記複数の親局機能手段が接続された１つの集線手段とを備えた通信装置における帯域制御方法であって、
前記各親局機能手段が、接続された前記各子局装置からの上り蓄積データ量情報に従い前記各子局装置への動的帯域割当を行うと共に、前記各子局装置の前記上り蓄積データ量情報を合計した合計上り蓄積データ量情報を含む親局情報を前記集線手段へ送信する工程と、
前記集線手段が、接続された前記各親局機能手段からの前記親局情報に従い前記各親局機能手段のための帯域割当を計算し帯域制限情報として前記各親局機能手段へ送信する工程と、
前記各親局機能手段が、前記集線手段からの前記帯域制限情報の帯域割当の範囲以内になるように前記動的帯域割当で求めた帯域割当量を圧縮して前記各子局装置へ送信する工程と、
を含むことを特徴とする通信装置における帯域制御方法。 A bandwidth control method in a communication apparatus comprising a plurality of master station function means to which at least one slave station device is connected, and a single line concentrator to which the plurality of master station function means are connected,
Each master station function means performs dynamic bandwidth allocation to each slave station device according to uplink stored data amount information from each connected slave station device, and the uplink stored data amount of each slave station device Transmitting master station information including total uplink accumulated data amount information totaling information to the concentrator;
The concentrating means calculates bandwidth allocation for each master station function means according to the master station information from each connected master station function means, and transmits the bandwidth allocation information to each master station function means; ,
Each master station function unit compresses the bandwidth allocation amount obtained by the dynamic bandwidth allocation so as to be within the range of the bandwidth allocation of the bandwidth limitation information from the concentrator, and transmits the compressed bandwidth allocation amount to each slave station device Process,
A bandwidth control method in a communication apparatus, comprising:
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