WO2018133480A1 - 一种动态带宽分配方法及装置 - Google Patents

一种动态带宽分配方法及装置 Download PDF

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WO2018133480A1
WO2018133480A1 PCT/CN2017/107941 CN2017107941W WO2018133480A1 WO 2018133480 A1 WO2018133480 A1 WO 2018133480A1 CN 2017107941 W CN2017107941 W CN 2017107941W WO 2018133480 A1 WO2018133480 A1 WO 2018133480A1
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length
dynamic
bandwidth allocation
frame length
bandwidth
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PCT/CN2017/107941
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French (fr)
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李祥辉
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烽火通信科技股份有限公司
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Priority to MYPI2019000310A priority Critical patent/MY201747A/en
Publication of WO2018133480A1 publication Critical patent/WO2018133480A1/zh
Priority to PH12019500062A priority patent/PH12019500062A1/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/70—Admission control; Resource allocation
    • H04L47/76—Admission control; Resource allocation using dynamic resource allocation, e.g. in-call renegotiation requested by the user or requested by the network in response to changing network conditions
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/70—Admission control; Resource allocation
    • H04L47/80—Actions related to the user profile or the type of traffic
    • H04L47/805—QOS or priority aware
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/70—Admission control; Resource allocation
    • H04L47/82—Miscellaneous aspects
    • H04L47/822—Collecting or measuring resource availability data

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  • the present invention relates to a passive optical network system in the field of communications, and in particular to a dynamic bandwidth allocation method and apparatus.
  • the PON Passive Optical Network
  • the PON system is generally an OLT (Optical Line Terminal) and an Optical Distribution Network (ODN).
  • OLT Optical Line Terminal
  • ODN Optical Distribution Network
  • the ONU Optical Network Unit
  • the OLT broadcasts data to all ONUs through the ODN; in the uplink direction, in order to avoid optical conflicts, time division multiplexing is adopted, and each ONU only The data transmission is performed in the time slot authorized by the OLT.
  • the allocation process of the time slot is the dynamic bandwidth allocation (DBA) process of the OLT.
  • DBA dynamic bandwidth allocation
  • the bandwidth is It is divided into the following types: fixed bandwidth R F (Fixed bandwidth), guaranteed bandwidth R A (Assured bandwidth), and supplementary bandwidth.
  • the supplementary bandwidth can be non-assured bandwidth (R NA ).
  • B BE Best-effort bandwidth
  • the allocation of the fixed bandwidth R F and the guaranteed bandwidth R A is relatively simple, and directly follows the fixed bandwidth R F without exceeding the maximum bandwidth R M (Maximum bandwidth). It can be allocated with the guaranteed bandwidth R A.
  • For the allocation of supplementary bandwidth proceed as follows:
  • Non-guaranteed bandwidth (R NA ) the i-th ONU performs dynamic bandwidth allocation according to formula (a) at time t
  • the uplink traffic of the ONU suddenly increases, it will bring a large uplink service delay, and may even cause packet loss.
  • the defect is determined by the characteristics of the PON system. That is, there is a certain delay between the time when the ONU uplink data responds to the bandwidth delivered by the OLT and the time when the OLT bandwidth is sent. This delay is generally a number of downlink DBA calculation periods (for example, 250us). That is, the bandwidth allocated by the OLT to the ONU is the bandwidth required by the ONU before several DBA calculation cycles, instead of the bandwidth required at the current time. Therefore, this will cause the ONU to fail to obtain the required time when the upstream traffic suddenly increases. Bandwidth, which causes uplink service delays and may even result in packet loss;
  • bandwidth allocated by the OLT to the ONU is the bandwidth required by the ONU for several DBA calculation cycles, instead of the bandwidth required at the current time. This causes the ONU to obtain a larger bandwidth than the actual required bandwidth, resulting in wasted bandwidth. ;
  • the technical problem to be solved by the present invention is that when the ONU uplink traffic suddenly increases, the existing DBA algorithm may cause a large uplink service delay, and may even cause packet loss; when the ONU uplink traffic suddenly decreases, bandwidth is wasted.
  • the throughput and QOS (Quality of Service) of the entire PON system are reduced.
  • the technical solution adopted by the present invention is to provide a dynamic bandwidth allocation method, including the following steps:
  • the dynamic bandwidth allocation algorithm is modified by the uplink traffic dynamic change factor, and the dynamic bandwidth allocation algorithm is used to allocate dynamic bandwidth to the ONU.
  • the allocated bandwidth is converted into a bandwidth allocation structure conforming to the PON protocol standard, and is sent to the corresponding ONU through the downlink frame.
  • the uplink traffic information includes the total length of the uplink burst, the length of the GTC frame header, the length of the GEM frame header, the length of the FEC check, the length of the idle frame, the length of the PLOAM message, the length of the DBRU flag, the length of the GEM frame padding, and the length of the idle frame. ;
  • Effective frame length total length - (GTC frame header length + GEM frame header length + FEC check length + Idle frame length + PLOAM message length + DBRU flag length + GEM frame padding byte length + idle frame length) (1).
  • N is greater than or equal to 1.
  • the modified dynamic bandwidth allocation algorithm (5) performs dynamic bandwidth allocation for the i-th ONU at time t:
  • R NA is a non-guaranteed bandwidth
  • R F is a fixed bandwidth
  • R A is a guaranteed bandwidth
  • FTraffic is an uplink traffic dynamic change factor
  • the modified dynamic bandwidth allocation algorithm (6) performs dynamic bandwidth allocation for the ith ONU at time t:
  • R BE is the best effort bandwidth
  • R M is the maximum bandwidth
  • R F is the fixed bandwidth
  • R A is the guaranteed bandwidth
  • FTraffic is the uplink traffic dynamic change factor
  • the invention also provides a dynamic bandwidth allocation device, comprising:
  • the uplink traffic collection unit parses the uplink burst frame and acquires uplink traffic information
  • the average flow calculation unit calculates an effective frame length average value and an idle frame length average value respectively based on the uplink traffic information acquired by the uplink traffic collection unit;
  • the effective frame length change calculation unit calculates an effective frame length change factor according to the average value of the effective frame length calculated by the mean flow calculation unit;
  • the idle frame length change calculation unit calculates an idle frame length change factor according to the average value of the idle frame length calculated by the mean flow calculation unit;
  • the uplink traffic dynamic change calculation unit calculates an uplink traffic dynamic change factor according to the effective frame length change factor calculated by the effective frame length change calculation unit and the idle frame length change factor calculated by the idle frame length change calculation unit;
  • the dynamic bandwidth allocation unit corrects the dynamic bandwidth allocation algorithm by using the uplink traffic dynamic change factor calculated by the uplink traffic dynamic change calculation unit, and uses the modified dynamic bandwidth allocation algorithm to perform dynamic bandwidth allocation on the ONU.
  • the dynamic bandwidth issuance unit is further configured to convert the bandwidth allocated by the dynamic bandwidth allocation unit into a bandwidth allocation structure conforming to the PON protocol standard, and send the downlink frame to the corresponding ONU.
  • the invention calculates the effective frame length average value and the idle frame length average value by monitoring the uplink effective frame and the uplink idle frame, and calculates the effective frame length change factor and the idle frame length change according to the effective frame length average value and the idle frame length average value, respectively.
  • Factor then calculate the uplink traffic dynamic change factor according to the effective frame length change factor and the idle frame length change factor, modify the traditional dynamic bandwidth allocation algorithm by using the uplink traffic dynamic change factor, and use the modified dynamic bandwidth allocation algorithm to dynamically dynamic the ONU Bandwidth allocation improves the efficiency of bandwidth allocation and uplink service response speed, thereby improving the throughput and QOS (Quality of Service) of the entire PON system.
  • QOS Quality of Service
  • FIG. 1 is a flow chart of a dynamic bandwidth allocation method according to the present invention.
  • FIG. 2 is a schematic structural diagram of a dynamic bandwidth allocation apparatus according to the present invention.
  • the invention provides a dynamic bandwidth allocation algorithm optimized in a burst mode, which not only can be well compatible with the existing dynamic bandwidth allocation system, but also can improve the efficiency of bandwidth allocation and the response speed of bandwidth allocation, and reduce the uplink.
  • Service delay thereby improving the throughput and QOS of the entire PON system, and the invention is all implemented on the OLT side, and the dynamic bandwidth allocation algorithm modified by the upstream traffic dynamic change factor only adds a small amount of mathematical operations, and these mathematical operations can be implemented by hardware.
  • Logic such as FPGA or ASIC
  • software implementation does not require additional design on the ONU side to improve the compatibility of the PON system with ONUs, especially for PON systems that need to be compatible with multiple manufacturers' ONUs.
  • the embodiment of the invention provides a dynamic bandwidth allocation method, as shown in FIG. 1 , including the following steps:
  • the uplink traffic information includes the total length of the uplink burst (BurstTotal_i), the GTC header length (GTCHeader_i), the GEM header length (GEMHeader_i), the FEC check length (FECParity_i), the idle frame length (Idlelen_i), and the PLOAM message length (PLOAM_i). ), DBRU flag length (DBRU_i), GEM frame fill byte length (GEMPadding_i), and idle frame length (Idlelen_i).
  • the average value of the uplink traffic information in N and (N+1) to 2N time slots ie, the average value of the effective frame length in N slots, and the effective frame length in (N+1) to 2N slots
  • the average value, the average value of the idle frame length in the N time slots, and the average of the idle frame lengths in the (N+1) to 2N time slots can effectively smooth the uplink traffic information of the ONU and timely acquire the trend of the upstream traffic change. Therefore, the statistics of the upstream traffic can be more effectively performed.
  • N is greater than or equal to 1;
  • N is greater than or equal to 1.
  • the dynamic bandwidth allocation algorithm is modified by using an uplink traffic dynamic change factor, and the dynamic bandwidth allocation algorithm is used to allocate dynamic bandwidth to the ONU, and the bandwidth allocation length of each uplink burst is obtained.
  • the modified dynamic bandwidth allocation algorithm (5) performs dynamic bandwidth allocation for the i-th ONU at time t:
  • R NA is a non-guaranteed bandwidth
  • R F is a fixed bandwidth
  • R A is a guaranteed bandwidth
  • FTraffic is an uplink traffic dynamic change factor
  • the modified dynamic bandwidth allocation algorithm (6) performs dynamic bandwidth allocation for the ith ONU at time t:
  • R BE is the best effort bandwidth
  • R M is the maximum bandwidth
  • R F is the fixed bandwidth
  • R A is the guaranteed bandwidth
  • FTraffic is the upstream traffic dynamic change factor
  • the embodiment of the invention further provides a dynamic bandwidth allocation device, as shown in FIG. 2, comprising:
  • the uplink traffic collection unit 10 parses the uplink burst frame and acquires uplink traffic information.
  • the average value calculation unit 20 calculates an effective frame length average value and an idle frame length average value based on the uplink traffic information acquired by the uplink traffic collection unit 10;
  • the effective frame length change calculation unit 30 calculates an effective frame length change factor according to the average value of the effective frame length calculated by the mean flow calculation unit 20;
  • the idle frame length change calculation unit 40 calculates an idle frame length change factor according to the average value of the idle frame length calculated by the mean flow calculation unit 20;
  • the uplink traffic dynamic change calculation unit 50 calculates the uplink traffic dynamic change factor according to the effective frame length change factor calculated by the effective frame length change calculation unit 30 and the idle frame length change factor calculated by the idle frame length change calculation unit 40;
  • the dynamic bandwidth allocating unit 60 uses the upper traffic dynamics calculation unit 50 to calculate the upper
  • the dynamic traffic bandwidth change factor is used to modify the dynamic bandwidth allocation algorithm, and the dynamic bandwidth allocation algorithm is used to allocate dynamic bandwidth to the ONU.
  • the dynamic bandwidth issuance unit 70 converts the bandwidth allocated by the dynamic bandwidth allocation unit 60 into a bandwidth allocation structure required by the PON protocol standard, and delivers the downlink frame to the corresponding ONU.

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Abstract

本发明公开了一种动态带宽分配方法及装置，该方法包括以下步骤：解析上行突发帧，并基于获取到的上行流量信息分别计算有效帧长度平均值和空闲帧长度平均值；根据有效帧长度平均值和空闲帧长度平均值分别计算有效帧长度变化因子和空闲帧长度变化因子；根据有效帧长度变化因子和空闲帧长度变化因子计算上行流量动态变化因子；利用上行流量动态变化因子对动态带宽分配算法进行修正，采用修正后的动态带宽分配算法对ONU进行动态带宽分配。本发明提升了带宽分配的效率和上行业务响应速度，从而提升了整个PON系统的吞吐量和服务质量。

Description

一种动态带宽分配方法及装置 技术领域
本发明涉及通信领域中的无源光网络系统，具体涉及一种动态带宽分配方法及装置。
背景技术
近年来，PON(Passive Optical Network，无源光网络)作为一种高速带宽接入技术得到快速发展，PON系统一般由OLT(Optical Line Terminal，光线路终端)、ODN(Optical Distribution Network，光分配网络)和ONU(Optical Network Unit，光网络单元)组成，在下行方向，OLT将数据通过ODN广播到所有的ONU；在上行方向，为了避免光冲突，则采用时分复用的方式，每个ONU只在被OLT授权的时隙进行数据传输，这种时隙的分配过程就是OLT的动态带宽分配(DBA，Dynamic Bandwidth Allocation)过程。
在PON系统的相关标准(例如GPON标准ITU-T G.984.3、XGPON标准ITU-T G.987.3和NGPON2标准ITU-T G.989.3)中，对DBA算法数学模型进行了详细描述，并将带宽分为以下几种类型，分别为固定带宽RF(Fixed bandwidth)、保证带宽RA(Assured bandwidth)以及补充带宽(Additional bandwidth)，补充带宽可以为非保证带宽RNA(Non-assured bandwidth)或尽力而为带宽RBE(Best-effort bandwidth)，其中，固定带宽RF和保证带宽RA的分配比较简单，在不超过最大带宽RM(Maximum bandwidth)的前提下，直接按照固定带宽RF和保证带宽RA来进行分配即可，对于补充带宽的分配，按照以下方式进行：
非保证带宽(RNA)，第i个ONU在t时刻按照公式(a)进行动态带宽分配
Figure PCTCN2017107941-appb-000001
尽力而为带宽(RBE)，第i个ONU在t时刻按照公式(b)进行动态带宽分配
Figure PCTCN2017107941-appb-000002
在实际的业务场景中，RF、RA和RM一般是固定不变的，因此，从上述公式(a)和(b)可以看出，各个ONU在t时刻分配的补充带宽只与当前可分配的总带宽以及RF、RA和RM有关，与当前实际流量没有关系。这个DBA算法模型对于一般的业务模型是适用的，目前商业的PON系统也大多基于该DBA算法，但该DBA算法存在以下缺陷：
(1)当ONU上行流量突然增加时，会带来较大的上行业务延迟，甚至可能会造成丢包。该缺陷是由PON系统的特点所决定的，即ONU上行数据响应OLT下发带宽的时刻与OLT带宽下发的时刻是存在一定的延迟的，这个延迟一般是若干个下行DBA计算周期(例如250us)，也就是说，OLT分配给ONU的带宽是ONU若干个DBA计算周期之前需要的带宽，而不是当前时刻需要的带宽，因此，这会导致ONU在上行流量突然增加时，无法及时获得所需带宽，从而带来上行业务延迟，甚至可能会造成丢包；
(2)当ONU上行流量突然减少时，会造成带宽浪费。如缺点(1)所述，OLT分配给ONU的带宽是ONU若干个DBA计算周期之前需要的带宽，而不是当前时刻需要的带宽，这会导致ONU得到的带宽大于实际需要的带宽，造成带宽浪费；
(3)如果同时存在上行流量突然增加的ONU以及上行流量突然减少的ONU，则会导致上行流量增加的ONU无法及时获得所需带宽，而上行流量突然减少的ONU却占有了不需要的带宽，从而降低了整个PON系统的吞吐量 和QOS(Quality of Service，服务质量)。
发明内容
本发明所要解决的技术问题是现有的DBA算法当ONU上行流量突然增加时，会带来较大的上行业务延迟，甚至可能会造成丢包；当ONU上行流量突然减少时，会造成带宽浪费；当同时存在上行流量突然增加的ONU以及上行流量突然减少的ONU时，降低了整个PON系统的吞吐量和QOS(服务质量)。
为了解决上述技术问题，本发明所采用的技术方案是提供一种动态带宽分配方法，包括以下步骤：
解析上行突发帧，并基于获取到的上行流量信息分别计算有效帧长度平均值和空闲帧长度平均值；
根据有效帧长度平均值和空闲帧长度平均值分别计算有效帧长度变化因子和空闲帧长度变化因子；
根据有效帧长度变化因子和空闲帧长度变化因子计算上行流量动态变化因子；
利用上行流量动态变化因子对动态带宽分配算法进行修正，并采用修正后的动态带宽分配算法对ONU进行动态带宽分配。
在上述技术方案中，将分配的带宽转换成符合PON协议标准的带宽分配结构，并通过下行帧下发到相应ONU。
在上述技术方案中，基于所述上行流量信息计算出有效帧长度，并根据有效帧长度计算有效帧长度平均值，其中；
所述上行流量信息包括上行突发的总长度、GTC帧头长度、GEM帧头长度、FEC校验长度、空闲帧长度、PLOAM消息长度、DBRU标志长度、GEM帧填充字节长度和空闲帧长度；
有效帧长度＝总长度-(GTC帧头长度+GEM帧头长度+FEC校验长度+ 空闲帧长度+PLOAM消息长度+DBRU标志长度+GEM帧填充字节长度+空闲帧长度)   (1)。
在上述技术方案中，
Figure PCTCN2017107941-appb-000003
Figure PCTCN2017107941-appb-000004
公式(2)和公式(3)中N大于等于1。
在上述技术方案中，
Figure PCTCN2017107941-appb-000005
在上述技术方案中，
对于非保证带宽，采用修正后的动态带宽分配算法(5)在t时刻对第i个ONU进行动态带宽分配：
Figure PCTCN2017107941-appb-000006
其中，RNA为非保证带宽，RF为固定带宽，RA为保证带宽，FTraffic为上行流量动态变化因子；
对于尽力而为带宽，采用修正后的动态带宽分配算法(6)在t时刻对第i个ONU进行动态带宽分配：
Figure PCTCN2017107941-appb-000007
其中，RBE为尽力而为带宽，RM为最大带宽,RF为固定带宽，RA为保证带宽，FTraffic为上行流量动态变化因子。
本发明还提供了一种动态带宽分配装置，包括：
上行流量采集单元，解析上行突发帧，并获取上行流量信息；
均值流量计算单元，基于所述上行流量采集单元获取的上行流量信息，分别计算有效帧长度平均值和空闲帧长度平均值；
有效帧长度变化计算单元，根据所述均值流量计算单元计算出的有效帧长度平均值计算有效帧长度变化因子；
空闲帧长度变化计算单元，根据所述均值流量计算单元计算出的空闲帧长度平均值计算空闲帧长度变化因子；
上行流量动态变化计算单元，根据所述有效帧长度变化计算单元计算出的有效帧长度变化因子和所述空闲帧长度变化计算单元计算出的空闲帧长度变化因子计算上行流量动态变化因子；
动态带宽分配单元，利用所述上行流量动态变化计算单元计算出的上行流量动态变化因子对动态带宽分配算法进行修正，并采用修正后的动态带宽分配算法对ONU进行动态带宽分配。
在上述技术方案中，还包括动态带宽下发单元，将所述动态带宽分配单元分配的带宽转换成符合PON协议标准的带宽分配结构，并通过下行帧下发到相应ONU。
本发明通过监控上行有效帧和上行空闲帧，计算出有效帧长度平均值和空闲帧长度平均值，根据有效帧长度平均值和空闲帧长度平均值分别计算有效帧长度变化因子和空闲帧长度变化因子，再根据有效帧长度变化因子和空闲帧长度变化因子计算上行流量动态变化因子，利用上行流量动态变化因子对传统动态带宽分配算法进行修正，并采用修正后的动态带宽分配算法对ONU进行动态带宽分配，提升了带宽分配的效率和上行业务响应速度，从而提升了整个PON系统的吞吐量和QOS(服务质量)。
附图说明
图1为本发明中一种动态带宽分配方法流程图；
图2为本发明中一种动态带宽分配装置结构示意图。
具体实施方式
本发明提供了一种在突发方式下优化的动态带宽分配算法，不仅可以很好的兼容于现有的动态带宽分配系统，同时还可以提升带宽分配的效率和带宽分配的响应速度，降低上行业务延迟，从而提升整个PON系统的吞吐量和QOS，而且本发明全部在OLT侧实现，经上行流量动态变化因子修改后的动态带宽分配算法只增加了少量的数学运算，这些数学运算可以采用硬件逻辑(如FPGA或者ASIC)或者软件实现，不需要在ONU侧增加额外的设计，从而提升PON系统对ONU的兼容性，特别适用于需要兼容多个厂商ONU的PON系统。
下面结合说明书附图和具体实施方式对本发明做出详细的说明。
本发明实施例提供了一种动态带宽分配方法，如图1所示，包括以下步骤：
S1、解析上行突发帧，并获取上行流量信息。
上行流量信息包括上行突发的总长度(BurstTotal_i)、GTC帧头长度(GTCHeader_i)、GEM帧头长度(GEMHeader_i)、FEC校验长度(FECParity_i)、空闲帧长度(Idlelen_i)、PLOAM消息长度(PLOAM_i)、DBRU标志长度(DBRU_i)、GEM帧填充字节长度(GEMPadding_i)和空闲帧长度(Idlelen_i)。
S2、基于上行流量信息，分别计算N个和(N+1)～2N个时隙内有效帧长度(Validlen_i)平均值(Validlen_m1,Validlen_m2)和空闲帧长度平均值(Idlelen_m1,Idlelen_m2)。
计算有效帧长度平均值时，需先基于上行流量信息计算出有效帧长度，其中，有效帧长度＝总长度-(GTC帧头长度+GEM帧头长度+FEC校验长度+空闲帧长度+PLOAM消息长度+DBRU标志长度+GEM帧填充字节长度+空闲帧长度)   (1)。
通过计算N个和(N+1)～2N个时隙内的上行流量信息的平均值(即N个时隙内有效帧长度平均值、(N+1)～2N个时隙内有效帧长度平均值、N个时隙内空闲帧长度平均值以及(N+1)～2N个时隙内空闲帧长度平均值)，能够对ONU的上行流量信息进行有效平滑，及时获取上行流量变化的趋势，从而能够更有效的进行上行流量的统计。
S3、根据有效帧长度平均值和空闲帧长度平均值分别计算有效帧长度变化因子(FValidlen_m)和空闲帧长度变化因子(FIdlelen_m)。
Figure PCTCN2017107941-appb-000008
即
Figure PCTCN2017107941-appb-000009
公式(2)中N大于等于1；
Figure PCTCN2017107941-appb-000010
即
Figure PCTCN2017107941-appb-000011
公式(3)中N大于等于1。
S4、根据有效帧长度变化因子和空闲帧长度变化因子计算上行流量动态变化因子(FTraffic)。
Figure PCTCN2017107941-appb-000012
即
Figure PCTCN2017107941-appb-000013
S5、利用上行流量动态变化因子对动态带宽分配算法进行修正，并采用修正后的动态带宽分配算法对ONU进行动态带宽分配，得到每个上行突发的带宽分配长度。
对于非保证带宽，采用修正后的动态带宽分配算法(5)在t时刻对第i个ONU进行动态带宽分配：
Figure PCTCN2017107941-appb-000014
公式(5)中，RNA为非保证带宽，RF为固定带宽，RA为保证带宽，FTraffic为上行流量动态变化因子；
对于尽力而为带宽，采用修正后的动态带宽分配算法(6)在t时刻对第i个ONU进行动态带宽分配：
Figure PCTCN2017107941-appb-000015
公式(6)中，RBE为尽力而为带宽，RM为最大带宽,RF为固定带宽，RA为保证带宽，FTraffic为上行流量动态变化因子。
S6、将分配的带宽转换成PON协议标准要求的带宽分配结构(BWmap,bandwidth map)，并通过下行帧下发到相应ONU。
本发明实施例还提供了一种动态带宽分配装置，如图2所示，包括：
上行流量采集单元10，解析上行突发帧，并获取上行流量信息；
均值流量计算单元20，基于上行流量采集单元10获取的上行流量信息，分别计算有效帧长度平均值和空闲帧长度平均值；
有效帧长度变化计算单元30，根据均值流量计算单元20计算出的有效帧长度平均值计算有效帧长度变化因子；
空闲帧长度变化计算单元40，根据均值流量计算单元20计算出的空闲帧长度平均值计算空闲帧长度变化因子；
上行流量动态变化计算单元50，根据有效帧长度变化计算单元30计算出的有效帧长度变化因子和空闲帧长度变化计算单元40计算出的空闲帧长度变化因子计算上行流量动态变化因子；
动态带宽分配单元60，利用上行流量动态变化计算单元50计算出的上 行流量动态变化因子对动态带宽分配算法进行修正，并采用修正后的动态带宽分配算法对ONU进行动态带宽分配；
动态带宽下发单元70，将动态带宽分配单元60分配的带宽转换成PON协议标准要求的带宽分配结构，并通过下行帧下发到相应ONU。
本发明不局限于上述最佳实施方式，任何人在本发明的启示下作出的结构变化，凡是与本发明具有相同或相近的技术方案，均落入本发明的保护范围之内。

Claims (8)

  1. 一种动态带宽分配方法，其特征在于，包括以下步骤：
    解析上行突发帧，并基于获取到的上行流量信息分别计算有效帧长度平均值和空闲帧长度平均值；
    根据有效帧长度平均值和空闲帧长度平均值分别计算有效帧长度变化因子和空闲帧长度变化因子；
    根据有效帧长度变化因子和空闲帧长度变化因子计算上行流量动态变化因子；
    利用上行流量动态变化因子对动态带宽分配算法进行修正，并采用修正后的动态带宽分配算法对ONU进行动态带宽分配。
  2. 如权利要求1所述的动态带宽分配方法，其特征在于，将分配的带宽转换成符合PON协议标准的带宽分配结构，并通过下行帧下发到相应ONU。
  3. 如权利要求1所述的动态带宽分配方法，其特征在于，基于所述上行流量信息计算出有效帧长度，并根据有效帧长度计算有效帧长度平均值，其中；
    所述上行流量信息包括上行突发的总长度、GTC帧头长度、GEM帧头长度、FEC校验长度、空闲帧长度、PLOAM消息长度、DBRU标志长度、GEM帧填充字节长度和空闲帧长度；
    有效帧长度＝总长度-(GTC帧头长度+GEM帧头长度+FEC校验长度+空闲帧长度+PLOAM消息长度+DBRU标志长度+GEM帧填充字节长度+空闲帧长度)(1)。
  4. 如权利要求3所述的动态带宽分配方法，其特征在于，
    Figure PCTCN2017107941-appb-100001
    Figure PCTCN2017107941-appb-100002
    公式(2)和公式(3)中N大于等于1。
  5. 如权利要求4所述的动态带宽分配方法，其特征在于，
    Figure PCTCN2017107941-appb-100003
  6. 如权利要求5所述的动态带宽分配方法，其特征在于，
    对于非保证带宽，采用修正后的动态带宽分配算法(5)在t时刻对第i个ONU进行动态带宽分配：
    Figure PCTCN2017107941-appb-100004
    其中，RNA为非保证带宽，RF为固定带宽，RA为保证带宽，FTraffic为上行流量动态变化因子；
    对于尽力而为带宽，采用修正后的动态带宽分配算法(6)在t时刻对第i个ONU进行动态带宽分配：
    Figure PCTCN2017107941-appb-100005
    其中，RBE为尽力而为带宽，RM为最大带宽,RF为固定带宽，RA为保证带宽，FTraffic为上行流量动态变化因子。
  7. 一种动态带宽分配装置，其特征在于，包括：
    上行流量采集单元，解析上行突发帧，并获取上行流量信息；
    均值流量计算单元，基于所述上行流量采集单元获取的上行流量信息，分别计算有效帧长度平均值和空闲帧长度平均值；
    有效帧长度变化计算单元，根据所述均值流量计算单元计算出的有效 帧长度平均值计算有效帧长度变化因子；
    空闲帧长度变化计算单元，根据所述均值流量计算单元计算出的空闲帧长度平均值计算空闲帧长度变化因子；
    上行流量动态变化计算单元，根据所述有效帧长度变化计算单元计算出的有效帧长度变化因子和所述空闲帧长度变化计算单元计算出的空闲帧长度变化因子计算上行流量动态变化因子；
    动态带宽分配单元，利用所述上行流量动态变化计算单元计算出的上行流量动态变化因子对动态带宽分配算法进行修正，并采用修正后的动态带宽分配算法对ONU进行动态带宽分配。
  8. 如权利要求7所述的动态带宽分配装置，其特征在于，还包括动态带宽下发单元，将所述动态带宽分配单元分配的带宽转换成符合PON协议标准的带宽分配结构，并通过下行帧下发到相应ONU。
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