CN101009652A - The method for downlink stream control information transfer in the Ethernet passive optical network - Google Patents

The method for downlink stream control information transfer in the Ethernet passive optical network Download PDF

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CN101009652A
CN101009652A CN 200710002721 CN200710002721A CN101009652A CN 101009652 A CN101009652 A CN 101009652A CN 200710002721 CN200710002721 CN 200710002721 CN 200710002721 A CN200710002721 A CN 200710002721A CN 101009652 A CN101009652 A CN 101009652A
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network
control
ethernet
step
according
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CN 200710002721
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于金辉
马焕南
谢云鹏
李明生
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中兴通讯股份有限公司
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00Traffic regulation in packet switching networks
    • H04L47/10Flow control or congestion control
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00Traffic regulation in packet switching networks
    • H04L47/10Flow control or congestion control
    • H04L47/11Congestion identification
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00Traffic regulation in packet switching networks
    • H04L47/10Flow control or congestion control
    • H04L47/33Forward notification

Abstract

The provided transmission method for down flow control information in Ethernet PON comprises: Step S402. Detecting whether jam on up link port of network terminal, and setting the flow control mark according to detection result; and Step S404.checking periodically the mark, and processing according to the check result. This invention enhances network device function, and improves network efficiency and flexibility.

Description

以太网无源光网络下行流控信息传递方法 EPON downstream control information transmission method

技术领域 FIELD

本发明涉及无源光网络系统(XPON),更具体地,本发明涉及一种下行流控信息传递方法,用于传递以太网无源光网络(EPON)的下行流控信息。 The present invention relates to a passive optical network system (XPON), and more particularly, the present invention relates to a downstream control information transmission method for transmitting Ethernet Passive Optical Network (EPON) downstream of the flow control information.

背景技术 Background technique

EPON技术是新兴的基于以太网的宽带无源光网络技术。 EPON technology is emerging Ethernet-based broadband passive optical network technology. 其本质是以太网在接入网领域的延伸。 Which extends essentially in the field of the Ethernet access network. EPON在物理拓扑上是一对多结构,逻辑上则为一对一结构。 On the physical topology EPON are many structures, for the one logical structure. 其下行数据传送为广播方式,所有光网络单元(ONU)都能在其物理PON(无源光网络)口上接收到所有的下行数据帧。 Transmitting downlink data which is broadcast, all optical network units (ONU) can receive all the data frames on downlink physical PON (Passive Optical Network) port. 而上行则为时分多址(TDMA)方式,每个ONU只在光线路终端(OLT)为其分配的上行授权时隙内发送上行数据。 Compared with the upstream time division multiple access (TDMA) mode, each ONU transmits only the uplink data in the uplink grant assigned timeslot optical line terminal (OLT). OLT处为ONU分配上行时隙的功能模块称为动态带宽分配(DBA)。 ONU at the OLT for the upstream timeslots assigned function module called dynamic bandwidth allocation (DBA). DBA为ONU分配上行带宽时除了考虑ONU上报的队列状态外,还要考虑网管为每个ONU配置的服务级别约定(SLA)参数。 DBA ONU upstream bandwidth allocation is considered in addition to the state reported by the ONU queue, but also consider the network configuration for each ONU service level agreement (SLA) parameters. 这些参数的内容视不同的DBA算法而不同,但至少都应包括最大带宽和保证带宽两个参数。 These parameters are different depending on the contents of DBA algorithms and different, but at least should include guaranteed bandwidth and maximum bandwidth two parameters.

为了降低成本,便于收敛接入层业务流量,目前不少OLT采用拥塞型结构设计,即OLT的上联口带宽小于所有OLT PON口上行带宽的总和。 To reduce costs, to facilitate the convergence of traffic access layer, that many of the OLT using the congestion type design, i.e., the OLT uplink port bandwidth of less than all of the PON OLT uplink interface total bandwidth. 这种结构在所有ONU发送的上行流量超过上联口可用带宽时,不可避免地会出现拥塞。 In this arrangement the upstream traffic transmitted over all ONU uplink port available bandwidth inevitably congestion. 但现有的OLT设备没有反压下行流控信息到ONU的功能。 However, the existing OLT devices do not line back pressure flow control information to the ONU function. 在拥塞发生后,OLT只是简单地将从ONU接收到的数据帧按一定比率丢弃。 After the congestion occurs, OLT simply from ONU received data frame is discarded according to a certain ratio. 而接入网大多数上网业务为TCP业务,其对网络拥塞的敏感度较高。 The majority of Internet access network services for TCP traffic, the higher its sensitivity to network congestion. 如果被丢弃的业务为TCP业务,则用户终端只能被动地等到定时器超时然后再重传。 If the traffic is discarded TCP traffic, the user terminal only passively wait before retransmission timer times out. 从而降低了整个网络的吞吐量。 Thereby reducing the overall network throughput.

图1是相关技术中拥塞型OLT结构框图,如图1所示,两个OLT的MAC(媒介接入控制)芯片通过一个交换芯片(SW)与背板相连。 FIG. 1 is a block diagram showing the congestion type OLT related art, as shown, two of the OLT MAC (Media Access Control) chip connected to the backing plate 1 through a switch chip (SW). OLT MAC芯片与交换芯片之间的接口为GMII接口,称为网络侧接口(NNI)。 OLT MAC interface between the chip and the chip switching GMII interface called network side interface (NNI). 交换芯片与背板之间的接口也为GMII接口,称为上联口。 The interface between the chip and the exchange of the backing plate is also GMII interface called uplink port. 当每个OLT MAC向交换芯片发送的数据流量总流量超过1Gpbs时,SW的上联口就会出现拥塞。 When the total flow of each data transmitted to the OLT MAC chip switching over 1Gpbs, SW uplink port will congestion. 如果所有芯片的流控功能都使能的话,此时交换芯片因上行出口拥塞生成流控帧并反压给OLT MAC。 If flow control is enabled for all chips are, then, when the switch chip generated by the uplink congestion outlet backpressure flow control frames and to the OLT MAC. 在相关技术中,OLT MAC并不会将该流控信息进一步反压给ONU,而是简单地在将超出其缓存能力的帧丢弃。 In the related art, OLT MAC not the backpressure flow control information further to ONU, but simply in the frame buffer capacity beyond its discarding.

因此,如何将流控信息有效地从OLT传递给ONU对于完善EPON的功能非常重要。 Therefore, how to control the flow of information efficiently is important for the function passed to complete EPON ONU from the OLT. 目前,见诸报道的技术方案只有一个,即烽火通信科技股份有限公司的专利“以太网无源光网络的流量控制方法和该方法所使用的装置”(申请号:200410070719.9)。 Currently, only been reported in a technical solution, i.e. FiberHome patent "means Ethernet Passive Optical Network traffic control method and the method used" (application number: 200410070719.9). 该专利采用的方法是将以太网的流控机制引入到OLT MAC中,通过OLTMAC发送扩展的pause帧到ONU来实现下行流控信息的传递。 The method of this patent uses OLT MAC introduced into the Ethernet flow control mechanism for transmitting the extended by OLTMAC pause frame to the ONU to realize downlink transmission flow control information. 但是,该方法需要特定的硬件来实现,不能在现有符合802.3ah标准的EPON OLT MAC芯片上使用,而且流控是针对所有ONU进行的,不能区分不同优先级的ONU,因而其实用性和灵活性有限。 However, this method requires specific hardware to achieve, can not be used in compliance with the existing standards 802.3ah EPON OLT MAC chip, and flow control is performed for all the ONU can not distinguish different priorities of the ONU, and therefore its usefulness limited flexibility.

因此,需要一种新的下行流控信息传递方法,用于EPON的下行流控信息的传递,以解决上述问题。 Thus, a new downlink flow control information transmission method for transmitting control information EPON downstream to solve the above problems.

发明内容 SUMMARY

为了解决上述问题,本发明提供了一种流控信息传递方法,用于以太网无源光网络(EPON)的下行流控信息的传递,克服了现有EPON系统不能将OLT上联口来的下行流控信息传递到ONU的问题。 To solve the above problems, the present invention provides a flow control information transmission method for transmitting control information about downstream Ethernet Passive Optical Network (EPON), and to overcome the existing EPON system OLT uplink port will not come the downlink flow control information is transmitted to the ONU problem.

为了实现上述目的,本发明提供了一种流控信息传递方法,用于传递以太网无源光网络的下行流控信息,该方法包括以下步骤:步骤S402,检测在光线路终端的上联口处是否出现拥塞,并根据检测结果设置流控标识;以及步骤S404,周期性地检查流控标识,并根据检查结果进行相应处理。 To achieve the above object, the present invention provides a flow control information transmission method for transmitting control information about downstream Ethernet passive optical network, the method comprising the following steps: step S402, detecting the uplink port in an optical line terminal if the congestion, and flow control is provided based on a detection result of the identification; and step S404, the flow control periodically check identifier, and a corresponding processing according to test results.

根据本发明,步骤S402还包括以下步骤:实时计算端口缓存队列占有率;判断端口缓存队列占有率是否大于预定阈值;以及如果判断结果为大于,则设置流控标识,否则清除流控标识。 According to the present invention, the step S402 further includes the step of: calculating the real-time interface buffer queue occupancy; determining whether the port queue buffer occupancy is greater than a predetermined threshold value; and if the judgment result is greater than the set flow control identifier, control or purge stream identifier.

此外,根据本发明,可选地,步骤S402还包括以下步骤:周期性统计上联口或网络侧接口接收到的流控帧;以及如果与前一周期相比,流控帧增加,则将下行流控标识设置为1,否则,如果连续预设数量的周期流控帧没有增加,则清除流控标识,将其设为0。 Further, according to the present invention, optionally, further comprising the step of the step S402: Statistics periodic uplink port or the network interface receives a flow control frame; and, if the flow control frame is increased compared to the previous cycle, then downstream control identifier to 1, otherwise, if a predetermined number of consecutive frames does not increase the flow control period, flow control identifier is cleared, it is set to 0.

根据本发明的实施例,流控标识是由1bit的寄存器来实现的;可选地,流控标识是由软件变量来实现的。 According to an embodiment of the present invention, flow control is identified by the register implemented 1bit; alternatively, be identified by the software flow control variable to achieve.

在步骤S404中,如果检查到的当前的流控标识为1,相应处理具体为:对服务级别约定参数进行动态削减。 In step S404, check if the current flow control is identified as 1, respective processing specifically comprises: service level agreement parameters dynamically cuts.

另外,在步骤S404中,如果检查到的流控标识为0,相应处理为:读取先前保存的流控标识;以及如果先前保存的流控标识为1,则对服务级别参数进行动态恢复,否则不做任何处理。 Further, in step S404, the control flow if the checked identifier is 0, the respective processing of: reading the previously stored flow control identifier; and 1, then the dynamic service level parameters previously saved recovery if identified as a flow control, otherwise no treatment.

根据本发明,动态削减包括以下步骤:步骤A,为与上联口有关的所有光网络单元设置优先级并据此划分成两组,分别为高优先级组和低优先级组,同时保证所有光网络单元的服务级别约定最大带宽之和小于或等于上联口的可用带宽;步骤B,如果此时流控标识为1,则减少低优先级组中的光网络单元的服务级别约定参数中的最大带宽到保证带宽,并延时一个周期;步骤C,如果此时流控标识是否仍为1,则按第一预定算法减少高优先级组中的光网络单元的服务级别约定参数中的最大带宽,并延时一个周期;以及步骤D,重复步骤C,直到流控制标识被设置为0,或所有光网络单元的最大带宽等于保证带宽。 According to the invention, comprising reduction of dynamic steps of: Step A, set the priority for all the optical network units associated with the uplink port is divided into two groups and, accordingly, are a high priority group and the low priority group, and ensure that all agreed service level the optical network unit and a maximum bandwidth equal to or less than the available bandwidth of the uplink port; step B, and if identified as a flow control at this time, the service level agreement parameters to reduce the low priority group of optical network units guaranteed bandwidth to a maximum bandwidth and a latency period; step C, and if at this time to identify whether the flow control is still 1, press a first predetermined algorithm to reduce the level of service in the high priority group convention optical network unit parameters maximum bandwidth, and a delay time period; and a step D, Repetitive procedure C, until the flow control flag is set to 0, the maximum bandwidth, or all the optical network units is equal to the guaranteed bandwidth.

根据本发明,第一预定算法为:最大带宽=当前最大带宽-(原最大带宽-保证带宽)×X%,其中,X为可配置值。 According to the present invention, a first predetermined algorithm: current maximum bandwidth of the maximum bandwidth = - (formerly maximum bandwidth - guaranteed bandwidth) × X%, wherein, X is a configurable value.

并且,动态恢复为:如果检查到流控制标识为0,则将高优先级组中的光网络单元的服务级别约定参数中的最大带宽恢复为被动态调节之前的初始值,并延时一个周期;如果此时流控制标识仍为0,则按第二预定算法增加低优先级组中的光网络单元的服务级别约定参数中的最大带宽,并延时一个周期;以及重复以上步骤,直到流控制标识变为1或低优先级组中的光网络单元的服务级别约定参数中的最大带宽恢复为动态调节之前的初始值。 And, as Dynamic Recovery: Check if the flow control flag is 0, the high priority service level set in the optical network unit agreed maximum bandwidth parameter is restored to the initial value prior to be dynamically adjusted, and a delay time period ; If the flow control flag remains 0 at this time, press a second predetermined algorithm to increase the maximum bandwidth service level agreement parameters of the low priority group of optical network units, and a delay time period; and repeating the above steps until the flow service level control flag is set to 1 or a low priority group of optical network units conventions maximum bandwidth parameter is restored to the initial value before the dynamic adjustment.

另外,根据本发明,第二预定算法为:最大带宽=当前最大带宽+(原最大带宽-保证带宽)×X%,其中,X为可配置值。 Further, according to the present invention, the second predetermined algorithm: maximum bandwidth = current + maximum bandwidth (original maximum bandwidth - guaranteed bandwidth) × X%, wherein, X is a configurable value.

因此,本发明实现了以下技术效果: Accordingly, the present invention achieves the following technical effects:

使得EPON网元设备能够支持从OLT到ONU的下行流控信息传递,增强了EPON设备的功能,并提高了EPON网络的效率和灵活性。 EPON network element devices that can support the flow control information is transmitted downstream from the OLT to the ONU, it enhances the EPON equipment, and improve the efficiency and flexibility of EPON network.

本发明的其它特征和优点将在随后的说明书中阐述,并且,部分地从说明书中变得显而易见,或者通过实施本发明而了解。 Other features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or learned by practice of the present invention. 本发明的目的和其他优点可通过在所写的说明书、权利要求书、以及附图中所特别指出的结构来实现和获得。 The objectives and other advantages of the invention may be realized and attained by the written description, claims, and drawings structure particularly pointed out.

附图说明 BRIEF DESCRIPTION

附图用来提供对本发明的进一步理解,并且构成说明书的一部分,与本发明的实施例一起用于解释本发明,并不构成对本发明的限制。 The drawings provide a further understanding of the invention and constitute a part of this specification, the embodiments of the invention, serve to explain the invention, not to limit the present invention. 在附图中:图1是相关技术中拥塞型OLT结构框图;图2是EPON系统拓朴图;图3是根据本发明的下行流控信息传递示意图;图4是根据本发明的下行流控信息传递方法的流程图;图5是根据本发明的实施例的采用软件扫描方法来检测拥塞和设置流控标识的流程图;图6是根据本发明的实施例的读取流控标识并启动响应处理的流程图;图7是根据本发明的实施例的SLA参数动态削减的流程图;以及图8是根据本发明的实施例的从检测到流控标识清零以及再到SLA参数恢复的流程图。 In the drawings: FIG. 1 is a block diagram OLT type congestion related art; FIG. 2 is a topology EPON system; Figure 3 is a schematic diagram of a downlink transmission flow control information according to the present invention; FIG. 4 is controlled in accordance with the present invention, the downstream a flowchart of information transmission method; FIG. 5 is an embodiment of the present invention employ scanning methods to detect software flowchart congestion and flow control set identifier; FIG. 6 is a flow control read identifier according to an embodiment of the present invention and start in response to a flowchart of processing; FIG. 7 is a flowchart of SLA parameters embodiment of the present invention a dynamic reduction; and FIG. 8 is a flow control parameter identifier is cleared and then to recover from the detected SLA accordance with an embodiment of the present invention. flow chart.

具体实施方式 detailed description

以下结合附图对本发明的优选实施例进行说明,应当理解,此处所描述的优选实施例仅用于说明和解释本发明,并不用于限定本发明。 The following embodiments will be described in conjunction with the accompanying drawings of the preferred embodiments of the present invention, it should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention and are not intended to limit the present invention.

图2是EPON系统拓朴图。 FIG 2 is a topology EPON system of FIG. 从图中可以看出,一个OLT 202的PON口下可以通过分光器204连接多个ONU 206。 As can be seen from the figure, a plurality of ONU 206 may be connected by beam splitter 204 to the PON OLT 202 to a port. 从OLT 202到ONU 206的下行数据传送方式为时分复用且物理层广播方式,即每一个下行帧会发送到所有的ONU 206的PON端口,从ONU 206到OLT 202的上行数据传送方式为TDMA方式。 From the OLT 202 to the ONU 206 of a downlink data transmission mode and a physical layer for time division multiplex broadcast mode, i.e. each downlink frame sent to all the ONU of the PON port 206, an uplink data transfer scheme from the ONU 206 to the OLT 202 as TDMA the way.

以下将参照图3简单介绍本发明的基本思想,图3是根据本发明的下行流控信息传递示意图。 The basic idea below with reference to FIG. 3 of the present invention briefly, FIG. 3 is a schematic diagram of a downlink transmission flow control information according to the present invention.

如图3所示,OLT的NNI口在收到流控信息后,暂时停止向SW发送数据一段时间,此时其内部缓存队列占用率的增加导致流控标识被置位。 3, NNI ports of the OLT after receiving the flow control information, to stop sending data to the SW period of time, this time to increase its internal cache queue occupancy leads to flow control flag is set. 之后通过动态削减各个ONU的SLA参数,使得各个ONU获取的上行授权时隙减少,即减少了上行数据流量。 After reduction of dynamic SLA parameters of each ONU, so that each ONU acquired uplink grant time slot is reduced, a reduction of the uplink data traffic. ONU发送的流量降低直接影响到ONU内部缓存占有率的增加,进而产生流控帧,并从UNI口发送出去。 Reducing the flow rate ONU transmitted directly affect the internal buffer occupancy increases ONU, thereby generating flow control frame, and is transmitted from the UNI port. 最终实现了从OLT NNI口到ONU的UNI口的下行流控信息传递。 Ultimately the downstream control information transmitted from the OLT NNI UNI port opening to the ONU.

综上,本发明的基本步骤如图4所示。 In summary, the basic steps of the present invention is shown in FIG. 要想达到本发明的目的,下行流控信息传递方法需要包括以下步骤: To achieve the object of the present invention, the downstream flow control information transmission method requires comprising the steps of:

步骤S402,检测在光线路终端的上联口处是否出现拥塞,并根据检测结果设置流控标识;以及步骤S404,周期性地检查流控标识,并根据检查结果进行相应处理。 Step S402, detecting whether the uplink port of the optical line terminal congestion, and flow control is provided based on a detection result of the identification; and step S404, the flow control periodically check identifier, and a corresponding processing according to test results.

在步骤S402中,包括以下步骤:统计接收到的流控帧的数量,并计算端口缓存队列占有率;判断端口缓存队列占有率是否大于预定阈值;以及如果判断结果为大于,则设置流控标识,否则清除流控标识。 In step S402, comprising the steps of: controlling the number of streams received frame statistics, and calculates port buffer queue occupancy; determining whether the port queue buffer occupancy is greater than a predetermined threshold value; and if the judgment result is greater than the set flow control identifier otherwise, clear flow control identity.

可选地,步骤S402还包括以下步骤:周期性统计上联口或网络侧接口接收到的流控帧;以及如果与前一周期相比,流控帧增加,则将下行流控标识设置为1,否则,如果连续预设数量的周期流控帧没有增加,则清除流控标识,将其设为0。 Optionally, the step S402 further includes the step of: periodically statistically uplink port or network interface receives a flow control frame; and, if the flow control frame is increased compared to the previous cycle, then the downlink flow control is provided to identify 1, otherwise, if a preset number of consecutive cycles flow control frame is not increased, the clear identification flow control, set it to 0.

图5是根据本发明的实施例的采用软件扫描方法来检测拥塞和设置流控标识的流程图,如图5所示,该过程的基本思想是:对OLT上联口处拥塞状态的检查可以有两种方式:一种是硬件触发方式,另一种是软件扫描方式。 FIG 5 is an embodiment of the present invention employ scanning methods to detect software flowchart congestion and flow control set identified in FIG. 5, the basic idea of ​​the process are: checking the congestion status of the uplink port of the OLT may there are two ways: one is the hardware trigger mode, the other is a software scan mode.

一.对于硬件触发方式:需要硬件在接收到流控帧,以致端口缓存队列占有率超过流控的set门限后设置一拥塞指示寄存器(即下行流控标识),此时该存器只用1bit标识拥塞状态就可以了(0-无拥塞,1-拥塞)。 For a hardware trigger mode: Upon receiving the required hardware flow control frame, resulting in the port queue buffer occupancy exceeds the set threshold of the flow control is provided a congestion indication register (i.e. downstream control identifier), only this time the register 1bit identifying the congested state can be a (0-no congestion, congestion 1-).

二.对于软件扫描方式:下行流控标识为软件变量。 For two scanning software: Software identified as downstream control variables. 在软件上,一个进程周期性查询查询上联口缓存队列的占用率并据此设置下行流控标识;如果MAC芯片不支持缓存队列占用率的查询,则通过查询上联口(或网络侧接口)接收到流控帧的变化情况来判断是否出现了拥塞。 In software, a process periodically queries the query buffer queue occupancy uplink port disposed downstream of the control and accordingly identifier; if the MAC chip buffer queue occupancy does not support a query, the query through the uplink port (or network side interface ) receiving the change of flow control frames to determine whether there is congestion.

基本步骤是:定时器超时触发软件周期性扫描,方法是读取NNI口处接收到的流控帧,如果同前一周期相比有所增加则认为产生了拥塞,然后将流控标识置位。 The basic steps are: software timer expires triggering periodic scanning, is read at the NNI port flow control frame is received, if increased in comparison with the previous period is considered to generate congestion, and flow control set identifier . 如果连续N个周期(N可配)没有新增加的流控帧则认为拥塞状态消失,此时须将流控标识清除。 If N consecutive cycles (N can be equipped) no new increased flow control frame is considered congestion state disappears, and the control flow shall clear identification. 上述具体步骤如图5所示:步骤S502,读取接收到的流控帧统计;步骤S504,判断流控帧是否增加,如果增加,则进行步骤S506,如果没有增加,则继续进行步骤S508;步骤S506,将流控标识置位;步骤S508,流控恢复计数器加1;步骤S510,判断此时的计数值是否大于“N”,如果大于,则进行步骤S512,如果不大于,则结束该过程;以及步骤S512,清除流控标识。 The above-described specific steps shown in Figure 5: step S502, reads the received flow control frame statistics; step S504, the control flow is determined whether the frame is increased, if increased, for step S506, the increase if not, proceed to step S508; step S506, the control flow set identifier; step S508, the control flow recovery counter is incremented; step S510, the count value is determined at this time is greater than "N", if yes, perform step S512, the if not, the end of the process; and a step S512, the control identification purge stream.

根据本发明的实施例,流控标识是由1bit的寄存器来实现的;可选地,流控标识是由软件变量来实现的。 According to an embodiment of the present invention, flow control is identified by the register implemented 1bit; alternatively, be identified by the software flow control variable to achieve.

图6是根据本发明的实施例的读取流控标识并启动响应处理的流程图,如图6所示,进程周期性检查流控标识,并保存上一次状态跃迁后的状态值。 FIG 6 is a flow control read identification embodiment of the present invention and the process starts in response to a flowchart shown in FIG. 6, the flow control process periodically checks identification, and saves the previous state transition value state. 如果当前的流控标识为“1”,则启动SLA参数动态削减过程。 If the current flow control identified as "1", then start the process of SLA parameters dynamic cuts. 否则先判断保存的状态值是否为“1”,如果是“1”,则启动SLA参数恢复过程。 Otherwise, first determine whether the value of the saved state "1" if it is "1", the SLA parameters to start the recovery process. 具体步骤如下: Specific steps are as follows:

步骤S602,读取流控标识;步骤S604,判断当前的流控标识是否为“1”,如果为“1”,则进行步骤S606,如果不是“1”,则进行步骤S608;步骤S606,进行SLA的动态削减;步骤S608,读取流控标识的原值;步骤S610,判断原值是否为“1”,如果不为“1”,则结束该过程,如果为“1”,则进行步骤S612;步骤S612,进行SLA恢复。 Step S602, the read control flow identifier; step S604, the control whether the flow identifier is "1" if it is "1", for step S606, the if not "1", then step S608; step S606, the carried reduction of dynamic SLA; step S608, reads the original value of the flow control identifier; step S610, the original value is determined is "1", if not "1", then the process ends, if it is "1", then step S612; step S612, the SLA for recovery.

图7是根据本发明的实施例的SLA参数动态削减的流程图。 FIG 7 is a flowchart of SLA parameters embodiment of the present invention is a dynamic embodiment cuts. 动态削减包括以下步骤:步骤A,为与上联口有关的所有光网络单元设置优先级并据此划分成两组,分别为高优先级组和低优先级组,同时保证所有光网络单元的服务级别约定最大带宽之和小于或等于上联口的可用带宽;步骤B,如果此时流控标识为1,则减少低优先级组中的光网络单元的服务级别约定参数中的最大带宽到保证带宽,并延时一个周期;步骤C,如果此时流控标识是否仍为1,则按第一预定算法减少高优先级组中的光网络单元的服务级别约定参数中的最大带宽,并延时一个周期;以及步骤D,重复步骤C,直到流控制标识被设置为0,或所有光网络单元的最大带宽等于保证带宽。 Dynamic reduction comprising the following steps: Step A, for all the optical network associated with the uplink port priority setting unit are divided into two groups and, accordingly, are a high priority group and the low priority group, while ensuring that all of the optical network units service level agreed bandwidth and the maximum available bandwidth is less than or equal to the uplink port; step B, and if identified as a flow control at this time, the reduced maximum bandwidth service level agreement parameters of the low priority group of optical network units to guaranteed bandwidth, and a delay time period; step C, and if at this time whether the flow control is still an identification, press a first predetermined algorithm to reduce the maximum bandwidth service level agreement parameters of the high priority group of optical network units, and a delay period; and a step D, Repetitive procedure C, until the flow control flag is set to 0, the maximum bandwidth, or all the optical network units is equal to the guaranteed bandwidth.

如图7所示,示出了动态削减的实施例过程,该调整需要两个前提条件:一是需要将与该拥塞消息相关的ONU配置不同的优先级,并按优先级划分为两个组;二是要保证所有ONU的SLA最大带宽之和要小于等于SW上联口的可用带宽。 7, illustrates a process embodiment of the dynamic reduction, the adjustment requires two preconditions: first, the need to congestion message associated with the ONU to set different priorities, and prioritize divided into two groups ; second is to ensure that all the SLA ONU bandwidth and maximum available bandwidth of less than or equal to the uplink port on SW.

该动态削减的基本流程如下:步骤S702,读取操作阶段标识;步骤S704,判断当前处于调整的哪个阶段,其中,阶段一为待调整低优先级ONU组SLA阶段,阶段二为待调整高优先级ONU组SLA阶段,如果当前阶段为第一阶段,进行步骤S706;步骤S706,削减低优先级组中ONU的SLA参数中的最大带宽到保证带宽,并延时一个周期。 The basic flow dynamics reduction: step S702, the read operation identifying stage; step S704, which is determined in the current stage of adjustment, wherein a phase is adjusted to be a low priority group ONU SLA stage, two stage high priority to be adjusted ONU group SLA level stage, if the current stage is a first stage, a step S706; step S706, the SLA parameters to reduce the maximum bandwidth low priority group to the ONU guaranteed bandwidth and latency of one cycle. 如果为阶段二,则进行步骤S708;步骤S708,读取所有高优先级组中ONU的SLA最大带宽;步骤S710,判断最大带宽是否等于保证带宽,如果等于,则结束该进程,如果不等于,则进行步骤S712;步骤S712,将高优先级组中的ONU的SLA参数中的最大带宽等比例削减为:当前最大带宽-(原最大带宽-保证带宽)*X%,其中X为可配置值,并延时一个周期。 If phase two, then step S708; step S708, the maximum bandwidth read SLA all high priority group of ONU; step S710, the determined maximum bandwidth is equal to the guaranteed bandwidth, if it is equal, then the process ends, if not equal, then step S712; step S712, the the SLA parameters of the high priority group of the ONU maximum bandwidth proportionally reduced to: the current maximum bandwidth - (formerly maximum bandwidth - guaranteed bandwidth) * X%, where X is a configurable value and a delay period. 重复上述操作,直到流控标识变为“0”或者所有ONU的最大带宽都等于其保证带宽为止。 Above operations are repeated until the flow control flag is set to "0" or all ONU bandwidth is equal to the maximum of its guaranteed bandwidth.

图8是根据本发明的实施例的从检测到流控标识以及再到SLA参数恢复的流程图。 FIG 8 is a flowchart showing the recovery from the detected stream identifier, and then to control SLA parameters according to an embodiment of the present invention. 如图8所示,该流程包括以下步骤:步骤S802,读取操作阶段标识;步骤S804,判断当前处于恢复的哪个阶段,阶段一为待恢复高优先级ONU组SLA阶段,阶段二为待恢复低优先级ONU组SLA阶段。 8, the flow includes the following steps: step S802, the read operation identifying stage; step S804, the determination of which phase is currently in the recovery stage to be recovered as a high priority group ONU SLA stage, stage two is to be restored ONU SLA low priority group stage. 如当前阶段为第一阶段,则进行步骤S806,如果不是第一阶段,而是第二阶段,则进行步骤S808; The current stage is a first stage, is performed step S806, the first stage if it is not, but a second phase, step S808 is performed;

步骤S806,将高优先级组中的ONU的SLA参数中的最大带宽等恢复为参数动态削减操作之前的初始值,并延时一个周期;步骤S808,读取所有高优先级组中ONU的SLA最大带宽;步骤S810,判断此时的最大带宽是否小于初始值,如果仍小于初始值,则进行步骤S812,如果不小于,则结束该进程;步骤S812,如果此时流控标识仍然为“0”(即小于初始值),则将低优先级组中的ONU的SLA参数中的最大带宽等比例增加为:保证带宽+(原最大带宽-保证带宽)×X%,其中X为可配置值,并延时一个周期。 Step S806, the SLA parameters to restore the high priority group of the ONU maximum bandwidth initial value before the operation to reduce the dynamic parameter, and a delay time period; step S808, the ONU read all the high priority group of SLA maximum bandwidth; step S810, the maximum bandwidth is determined whether this time is smaller than the initial value, if still less than the initial value, proceeds step S812, the if not less than, the end of the process; step S812, the control flow at this time if the identification is still "0 "(i.e., smaller than the initial value), the ratio of the maximum bandwidth SLA parameters will be set in the low priority is increased as the ONU: + guaranteed bandwidth (original maximum bandwidth - guaranteed bandwidth) × X%, where X is a configurable value and a delay period. 重复上述操作,直到流控标识变为“1”或者所有低优先级ONU的SLA参数中的最大带宽都恢复到LSA参数动态削减操作之的初始值。 Above operations are repeated until the flow control parameters identifier SLA becomes "1" or all of the low priority in the ONU maximum bandwidth LSA parameters are restored to the initial value of the dynamic operation of the cut.

可以看出由于采取了上述下行流控信息传递方法,EPON网元设备能够支持从OLT到ONU的下行流控信息传递。 As a result of the above it can be seen that the downstream flow control information transmission method, EPON network element device can support the flow control information is transmitted downstream from the OLT to the ONU. 而且,本发明的方法控制灵活,实现简单,增强了EPON设备的功能,并提高了EPON网络的效率和灵活性。 Further, the flexible control method of the present invention, is simple and enhances the functionality of EPON equipment, and improve the efficiency and flexibility of EPON network.

以上仅为本发明的优选实施例而已,并不用于限制本发明,对于本领域的技术人员来说,本发明可以有各种更改和变化。 The above is merely illustrate the preferred embodiments of the present invention, not intended to limit the present invention, those skilled in the art, the present invention may have various changes and variations. 凡在本发明的精神和原则之内,所作的任何修改、等同替换、改进等,均应包含在本发明的保护范围之内。 Any modification within the spirit and principle of the present invention, made, equivalent substitutions, improvements, etc., should be included within the scope of the present invention.

Claims (11)

  1. 1.一种流控信息传递方法,用于传递以太网无源光网络的下行流控信息,其特征在于,包括以下步骤:步骤S402,检测在光线路终端的上联口处是否出现拥塞,并根据检测结果设置流控标识;以及步骤S404,周期性地检查所述流控标识,并根据检查结果进行相应处理。 A flow control information transmission method for transmitting control information about downstream Ethernet passive optical network, characterized by comprising the following steps: step S402, detecting whether congestion in the uplink port of the optical line terminal, and the detection result provided flow control identifier; and step S404, the flow control periodically checks the identification, and a corresponding processing according to test results.
  2. 2.根据权利要求1所述的流控信息传递方法,其特征在于,所述步骤S402还包括以下步骤:实时计算端口缓存队列占有率;判断所述端口缓存队列占有率是否大于预定阈值;以及如果判断结果为大于,则设置所述流控标识,否则清除所述流控标识。 The flow control information transmission method according to claim 1, wherein said step further comprises the step S402: port buffer queue occupancy calculated in real time; determining whether the port queue buffer occupancy is greater than a predetermined threshold value; If the determination result is greater than, the flow control identifier is set, otherwise clear identification of the flow control.
  3. 3.根据权利要求1所述的流控信息传递方法,其特征在于,所述步骤S402还包括以下步骤:周期性统计所述上联口或网络侧接口接收到的流控帧;以及如果与前一周期相比,所述流控帧增加,则将所述下行流控标识设置为1,否则,如果连续预设数量的周期所述流控帧没有增加,则清除所述流控标识,将其设为0。 The flow control information transmission method according to claim 1, wherein said step further comprises the step S402: Statistics periodically on the uplink port or the flow control frames received by a network side interface; and if the compared to the previous cycle, increasing the flow control frame, then the downstream control identifier to 1, otherwise, if the preset number of successive cycles of said flow control frame does not increase, then the purge flow control identifier, it is set to 0.
  4. 4.根据权利要求2或3所述的流控信息传递方法,其特征在于,所述流控标识是由1 bit的寄存器来实现的。 The flow control information transmission method of claim 2 or claim 3, wherein said flow control identified by 1 bit register achieved.
  5. 5.根据权利要求2或3所述的流控信息传递方法,其特征在于,所述流控标识是由软件变量来实现的。 The flow control information transmission method of claim 2 or claim 3, wherein said flow control variable identifier is implemented by software.
  6. 6.根据权利要求1所述的流控信息传递方法,其特征在于,在所述步骤S404中,如果检查到的当前的所述流控标识为1,所述相应处理具体为:对服务级别约定参数进行动态削减。 The flow control information transmission method according to claim 1, wherein, in the step S404, the current to check if the stream is identified as a control, the corresponding processing specifically comprises: service level agreed parameters for dynamic cuts.
  7. 7.根据权利要求1所述的流控信息传递方法,其特征在于,在所述步骤S404中,如果检查到的所述流控标识为0,所述相应处理为:读取先前保存的流控标识;以及如果所述先前保存的流控标识为1,则对所述服务级别参数进行动态恢复,否则不做处理。 The flow control information transmission method according to claim 1, wherein, in the step S404, the checking if the identification of the flow control is zero, the corresponding processing is: reading the previously stored stream control identifier; and if the previously saved flow control identifier is 1, the service level parameters for dynamic recovery, or not treated.
  8. 8.根据权利要求7所述的流控信息传递方法,其特征在于,所述动态削减包括以下步骤:步骤A,为与所述上联口有关的所有光网络单元设置优先级并根据所述优先级划分成两组,分别为高优先级组和低优先级组,同时保证所述所有光网络单元的服务级别约定最大带宽之和小于或等于所述上联口的可用带宽;步骤B,如果此时所述流控标识为1,则减少所述低优先级组中光网络单元的服务级别约定参数中的最大带宽到保证带宽,并延时一个周期;步骤C,如果此时所述流控标识是否仍为1,则按第一预定算法减少所述高优先级组中的光网络单元的服务级别约定参数中的最大带宽,并延时一个周期;以及步骤D,重复步骤C,直到所述流控制标识被设置为0,或所有光网络单元的最大带宽等于保证带宽。 8. The flow control information transmission method of claim 7, wherein the dynamic reduction comprising the steps of: step A, and according to the priority is set for all the optical network unit and the associated uplink port prioritization into two groups, namely, a high priority group and the low priority group, service level while ensuring that all the optical network units and conventions maximum bandwidth equal to or less than the available bandwidth of the uplink port; a step B, and At this time, if the flow control is identified as 1, decreased the low priority group, service level agreement parameters of an optical network unit in a maximum bandwidth to guaranteed bandwidth, and a delay time period; step C, and if at this time the identifying whether flow control is still 1, press a first predetermined algorithm to reduce the level of service in the high priority group of optical network units conventions maximum bandwidth parameter, and a delay time period; and a step D, Repetitive procedure C, until the control flag is set to 0, all of the optical network unit or a maximum bandwidth equal to the guaranteed bandwidth flows.
  9. 9.根据权利要求8所述的流控信息传递方法,其特征在于,所述第一预定算法为:最大带宽=当前最大带宽-(原最大带宽-保证带宽)×X%,其中,X为可配置值。 9. The flow control information transmission method according to claim 8, wherein said first predetermined algorithm: current maximum bandwidth of the maximum bandwidth = - (formerly maximum bandwidth - guaranteed bandwidth) × X%, wherein, X is configurable value.
  10. 10.根据权利要求8所述的流控信息传递方法,其特征在于,所述动态恢复为:如果检查到所述流控制标识为0,则将所述高优先级组中的光网络单元的服务级别约定参数中的最大带宽恢复为被动态削减之前的初始值,并延时一个周期;如果此时所述流控制标识仍为0,则按第二预定算法增加所述低优先级组中的光网络单元的服务级别约定参数中的最大带宽,并延时一个周期;以及重复以上步骤,直到所述流控制标识变为1或所述最低优先级的光网络单元的服务级别约定参数中的最大带宽恢复为所述动态调节之前的初始值。 10. The flow control information transmission method according to claim 8, wherein the dynamic recovery is: to check if the flow control flag is 0, the high priority group of the optical network unit will be maximum bandwidth service level agreement parameters are restored to the original value before the reduction is dynamic, and a delay time period; At this time, if the flow control flag remains 0, press a second predetermined algorithm to increase the low priority group service level agreement parameter maximum bandwidth optical network unit, and a delay time period; and repeating the above steps until the flow control flag is set to 1 or the lowest priority service level agreement parameters of the optical network units maximum bandwidth to restore the initial value before the dynamic adjustment.
  11. 11.根据权利要求10所述的流控信息传递方法,其特征在于,所述第二预定算法为:最大带宽=当前最大带宽+(原最大带宽-保证带宽)×X%,其中,X为可配置值。 11. The flow control information transmission method according to claim 10, wherein said second predetermined algorithm: maximum bandwidth = current + maximum bandwidth (original maximum bandwidth - guaranteed bandwidth) × X%, wherein, X is configurable value.
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