WO2009000194A1 - Procédé d'attribution de bande passante, système et appareil dans un réseau optique - Google Patents

Procédé d'attribution de bande passante, système et appareil dans un réseau optique Download PDF

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Publication number
WO2009000194A1
WO2009000194A1 PCT/CN2008/071380 CN2008071380W WO2009000194A1 WO 2009000194 A1 WO2009000194 A1 WO 2009000194A1 CN 2008071380 W CN2008071380 W CN 2008071380W WO 2009000194 A1 WO2009000194 A1 WO 2009000194A1
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WIPO (PCT)
Prior art keywords
optical network
bandwidth
layer channel
transport layer
unit
Prior art date
Application number
PCT/CN2008/071380
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English (en)
French (fr)
Inventor
Hai Gao
Wei Wu
Original Assignee
Huawei Technologies Co., Ltd.
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Publication date
Application filed by Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Publication of WO2009000194A1 publication Critical patent/WO2009000194A1/zh

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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04JMULTIPLEX COMMUNICATION
    • H04J3/00Time-division multiplex systems
    • H04J3/16Time-division multiplex systems in which the time allocation to individual channels within a transmission cycle is variable, e.g. to accommodate varying complexity of signals, to vary number of channels transmitted
    • H04J3/1694Allocation of channels in TDM/TDMA networks, e.g. distributed multiplexers

Definitions

  • the optical network technology of the present invention specifically relates to a bandwidth allocation method, system and device in an optical network. Background technique
  • the PON (Passive Optical Network) technology is a point-to-multipoint optical access technology. It consists of an OLT (Optical Line Terminal) on the central office and an ONU (Optical Network Unit) on the user side.
  • the optical network unit is composed of an ONT (Optical Network Terminal) (hereinafter referred to as an ONU/ONT) and an ODN (Optical Distribution Network).
  • ONT Optical Network Terminal
  • ODN Optical Distribution Network
  • the passive optical network system mainly uses the tree topology, as shown in Figure 1:
  • the OLT needs to uniformly allocate resource allocations between ONUs and ONTs.
  • the DBA (Dynamic Bandwidth Assignment) protocol is defined in the prior art standard, which specifies that the OLT allocates data to one or more bandwidth control units T-CONT (Transmission Container) in the ONU/ONT. Authorization to control upstream traffic.
  • T-CONT Transmission Container
  • Authorization to control upstream traffic To determine the bandwidth value assigned to a T-CONT, the OLT needs to know the traffic status of the T-CONT.
  • the first method is a direct "status report", that is, the SR (Status Reporting) mode; the other is called “idle unit monitoring.”
  • SR Status Reporting
  • NSR Non Status Reporting
  • the ONU/ONT reports the T-CONT packet buffer length to the OLT as its traffic status at the request of the OLT, that is, through the ONU/ONT DBRu (Dynamic Bandwidth Report upstream)
  • the peak cell rate (peak cell rate) included in the bandwidth report is reported.
  • the OLT obtains the traffic status of the T-CONT
  • the internal DBA functional entity reassigns the data authorization for the T-CONT, that is, the allocation.
  • the bandwidth value of the T-CONT is reported.
  • the DBA function entity in the OLT performs correlation calculation according to the traffic state of all T-CONTs reported in the uplink frame, that is, DBRu.PCR, and the actual configured bandwidth value of the T-CONT, and the calculation result is
  • the bandwidth allocation map BWmap is sent to each ONU/ONT to complete bandwidth allocation.
  • Each ONU/ONT transmits uplink burst data in its respective time slot according to the BWmap information, and occupies the uplink bandwidth.
  • the minimum BWmap of a DBA function for a T-CONT is defined as the length of DBRu, which is 2 bytes.
  • GEM G-PON Encapsulation Method
  • the minimum frame length can be 6 bytes. If the T-CONT of the ONU/ONT also supports a minimum of 2 bytes of DBRu and a minimum of 6 bytes of GEM frames, the DBA functional entity of the OLT can be used to implement the setting of any bandwidth value of each T-CONT and distribution.
  • the minimum BWmap length supported by ONU/ONT chips of many manufacturers is far greater than 2 bytes. If the BWmap allocated by the DBA function entity is smaller than the minimum supported by the ONU/ONT chip, the T-CONT of the ONU/ONT will be impossible. Supports such a small bandwidth and discards upstream packets. Summary of the invention
  • An embodiment of the present invention provides a bandwidth allocation method and system in an optical network, so as to prevent an ONU/ONT uplink packet from being lost between an OLT and an ONU/ONT, and an ONT of a plurality of different capabilities to implement an arbitrary transport layer channel. Bandwidth value assignment and setting.
  • An embodiment of the present invention further provides an optical line terminal and an optical network terminal, where the optical network terminal can report the bandwidth processing capability parameter of the transmission layer channel to the optical line terminal, where the optical line terminal can be more A different capability of ONU/ONT, which realizes the allocation and setting of the bandwidth value of any transport layer channel.
  • a bandwidth allocation method in an optical network comprising: parameters;
  • the method of the embodiment of the invention can prevent the ONU/ONT in the interworking between the OLT and the ONU/ONT
  • the uplink packet is lost, and the ONU/ONT of multiple different capabilities is considered to realize the allocation and setting of the bandwidth value of any transport layer channel.
  • a bandwidth allocation system in an optical network comprising: an optical line terminal and an optical network unit or an optical network terminal connected through an optical distribution network,
  • the optical line terminal includes: a capability parameter
  • an adapting unit configured to determine, according to the bandwidth processing capability parameter, a bandwidth allocation map of the transport layer channel of the optical network unit or the optical network terminal;
  • a sending unit configured to send the bandwidth allocation map to the optical network unit or the optical network terminal.
  • the system in the optical line terminal performs bandwidth adaptation according to the bandwidth processing capability parameter of the transmission layer channel of the ONU/ONT through the adaptation unit in the optical line terminal, and determines the transmission layer channel of the ONU/ONT.
  • the bandwidth allocation map can be compatible with ONU/ONTs of various different capabilities, and realize the allocation and setting of the arbitrary bandwidth value of the transmission layer channel of the ONU/ONT, and ensure the transmission of the uplink text of the ONU/ONT.
  • An optical line terminal comprising: a force parameter
  • an adapting unit configured to determine, according to the bandwidth processing capability parameter, a bandwidth allocation map of the transport layer channel of the optical network unit or the optical network terminal;
  • the optical line terminal of the embodiment of the present invention can allocate and set the bandwidth value of any transmission layer channel to the ONU/ONT of a plurality of different capabilities.
  • An optical network terminal includes:
  • a registration unit configured to register with an optical line terminal in the network when accessing the network
  • a reporting unit configured to report the transport layer channel to the optical line terminal after the registration unit completes the registration process Bandwidth processing capability parameters.
  • the optical network terminal of the embodiment of the present invention can report the bandwidth processing capability parameter of the transmission layer channel to the optical line terminal, and allocate the arbitrary bandwidth value of the transmission layer bandwidth channel for the optical line terminal.
  • the settings provide valid reference conditions.
  • FIG. 1 is a topological structural diagram of a passive optical network system in the prior art
  • FIG. 2 is a flowchart of a bandwidth allocation method in an optical network according to an embodiment of the present invention
  • FIG. 3 is a schematic block diagram of a bandwidth allocation system in an optical network according to an embodiment of the present invention
  • FIG. 4 is another schematic block diagram of a bandwidth allocation system in an optical network according to an embodiment of the present invention
  • the ONU/ONT reports to the OLT.
  • the T-CONT bandwidth processing capability parameter the OLT performs bandwidth adaptation according to different T-CONT bandwidth processing capability parameters, determines a bandwidth allocation map BWmap of the ONU/ONT transport layer channel, and then sends the determined BWmap to the ONU/
  • the ONT is implemented to adapt the BWmap required for each T-CONT, so that the optical network can be compatible with ONU/ONTs of different capabilities, and any bandwidth of each T-CONT can be implemented in the OLT and ONU/ONT interworking. The setting and assignment of values.
  • FIG. 2 is a flowchart of a bandwidth allocation method in an optical network according to an embodiment of the present invention, including the following steps:
  • the bandwidth processing capability parameter of the T-CONT is reported to the OLT.
  • the bandwidth processing capability parameter of the T-CONT may include: a packet fragmentation mode, a minimum acceptable time slot length, and a minimum acceptable packet length, where the packet fragmentation mode includes any length fragmentation and fixed. Length fragmentation. If the packet fragmentation mode is a fixed-length fragment, the bandwidth processing capability parameter of the transport layer channel further includes: a length value of the fixed fragment. The meaning of each parameter is as follows:
  • Packet fragmentation mode indicating any length fragmentation or fixed length fragmentation
  • the minimum acceptable time slot length indicates that the ONU/ONT cannot send DBRu and uplink data if the allocated BWmap is less than this length;
  • the minimum acceptable packet length indicates that if the assigned BWmap is less than this length, the ONU/ONT can send DBRu but cannot send upstream data packets.
  • the OLT records the bandwidth processing capability parameters of the received T-CONT.
  • the OLT may establish a capability parameter table of the T-CONT according to the capability parameter, and report the T-CONT reported by each ONU/ONT received.
  • the bandwidth processing capability parameter is stored in the table.
  • the bandwidth processing capability parameter of the corresponding T-CONT can be found according to the identifier of the ONU/ONT.
  • the OLT can also store the bandwidth processing capability parameters of the T-CONT in other ways, for example, in a dedicated database.
  • the OLT performs bandwidth adaptation according to the recorded bandwidth processing capability parameter of the T-CONT, that is, allocates the BWmap required by the ONU/OLT to report the DBRu according to the minimum acceptable time slot length of the transport layer channel in the parameter.
  • the OLT sends the BWmap required by the assigned DBRu to the ONU/ONT.
  • the ONU/ONT reports the DBRu of the T-CONT to the OLT.
  • the OLT performs bandwidth adaptation according to the recorded bandwidth processing capability parameter of the T-CONT, that is, allocates the BWmap of the T-CONT to the ONU/ONT according to the minimum acceptable time slot length of the transport layer channel in the parameter.
  • the OLT sends the BWmap of the assigned T-CONT to the ONU/ONT.
  • the new PLOAM (Physical Layer OAM) message or the OMCI (ONU Management and Control Interface) can be defined.
  • Unit management and control interface) Message reporting can also be reported through other dedicated messages.
  • ME Managed Entity
  • the content of the ME includes three parameters of the T-CONT bandwidth processing capability information of the ONU/ONT. The examples are as follows:
  • ONT T-CONT BWmap capability which describes the T-CONT bandwidth processing capability of the ONU/ONT.
  • the ONT T-CONT BWmap capability ME contains the key attribute fields shown in Table 2 below:
  • the ONU/ONT sends a PLOAM message or an OMCI message to the OLT, and reports the bandwidth processing capability parameter of the T-CONT to the OLT.
  • the bandwidth processing capability parameter of the T-CONT is the bandwidth processing capability parameter of the T-CONT, followed by the PCR (Peak Cell Rate) required by the DBRu included in the DBRu.
  • the bandwidth value actually configured for each T-CONT may also be different. Therefore, the bandwidth value actually configured by each T-CONT is also considered. Specifically, you can follow the following Assign the BWmap of the T-CONT to the ONU/ONT:
  • the BWmap of the T-CONT is allocated according to the minimum acceptable message length
  • the bandwidth that should be allocated can be obtained according to the DBA calculation procedure defined by the existing standard plus DBRu for the next frame.
  • the length is assigned to the BWmap of the T-CONT.
  • the T-CONT packet fragmentation mode supported by the T-CONT can be any length fragmentation or fixed-length fragmentation. Therefore, for the fixed-length fragmentation method, When the bandwidth is adapted, the BWmap of the T-CONT needs to be adjusted to be an integer multiple of the length of the fixed fragment of the T-CONT to ensure that the ONU/ONT effectively allocates the bandwidth of the uplink packet.
  • the following example further illustrates the process by which the OLT combines the T-CONT bandwidth capability parameter table, the DBRu required PCR, and the actual T-CONT configuration bandwidth value to calculate the B-map of the T-CONT.
  • T-CONT 1 and T-CONT 2 are: Type Type2, bandwidth parameter is guaranteed to be 8 bytes wide.
  • the BWmap required for DBRu reporting for each T-CONT is determined. The result is as follows:
  • T-CONT 1 DBRu.PCR 7 bytes
  • T-CONT 2 DBRu.PCR 9 bytes.
  • the OLT determines the BWmap for each T-CONT by combining the minimum acceptable message length in the T-CONT Bandwidth Capability Parameter Table, DBRu.PCR, T-CONT actual configuration bandwidth parameters: For T-CONT 1, its DBRu.PCR (7 bytes) is greater than the minimum acceptable message length (6 bytes) and less than the actual configured bandwidth parameter (8 bytes), so a 7-byte BWmap can be allocated, considering packet fragmentation. The way is to fix 8 bytes, make adaptation adjustments, and finally determine the BWmap that allocates 8 bytes.
  • the OLT obtains the bandwidth processing capability parameter of the T-CONT by receiving the information actively reported by the ONU/ONT, and then performs bandwidth adaptation according to the bandwidth processing capability parameter of the T-CONT to determine the ONU/ONT.
  • the process of T-CONT's BWmap In fact, the embodiments of the present invention are not limited to this manner.
  • the bandwidth processing capability parameter of the T-CONT of the ONU/ONT can be configured in advance on the OLT, so that the ONU/ONT does not need to report to the OLT, and the OLT can perform dynamic bandwidth allocation for the ONU/ONT.
  • the process of bandwidth adaptation is performed according to the configuration information, which is the same as steps 3 to 7 of the foregoing embodiment, and will not be described in detail herein.
  • the OLT allocates a suitable T-CONT BWmap for each ONU/ONT for the ONU/ONT of different capabilities, thereby realizing the allocation of the bandwidth value of any transmission layer channel. And the setting ensures the transmission of the uplink text of the ONU/ONT in the interworking between the OLT and the ONU/ONT.
  • FIG. 3 is a block diagram showing a principle of a bandwidth allocation system in an optical network according to an embodiment of the present invention:
  • the OLT 31 and the plurality of ONUs/ONTs 32 connected by the optical distribution network 30 are included in the system, wherein the OLT 31 includes: a storage unit 311, an adaptation unit 312, and a transmission unit 313.
  • the storage unit 311 is configured to store a bandwidth processing capability parameter of the T-CONT of the ONU/ONT 32.
  • the bandwidth processing capability parameter of the T-CONT includes: a packet fragmentation mode, a minimum acceptable slot length, and a minimum acceptable
  • the packet fragmentation mode includes any length fragmentation and fixed length fragmentation. If newspaper The fragmentation mode is a fixed-length fragmentation, and the bandwidth processing capability parameter of the transport layer channel further includes: a length value of the fixed fragment.
  • the bandwidth processing capability parameter of each T-CONT can be saved to the storage unit 311 in a pre-configured manner.
  • the adaptation unit 312 stores the T-CONT saved in the storage unit 311.
  • the bandwidth processing capability parameter performs bandwidth adaptation to determine the BWmap of the T-CONT; then the transmitting unit 313 sends the determined BWmap of the T-CONT to the corresponding ONU/ONT.
  • the process of the dynamic bandwidth allocation by the adaptation unit 312 is consistent with the description in the foregoing method of the embodiment of the present invention, and details are not described herein again.
  • a plurality of ONUs/ONTs are connected to the OLT through an optical distribution network.
  • the embodiment of the present invention is not limited to the networking mode, and may also be applied to a networking mode in which only a single ONU/ONT is used. .
  • the system of the embodiment of the present invention is further described by taking a networking mode in which a single ONU/ONT is connected to the OLT through an optical distribution network as an example.
  • FIG. 4 is a block diagram showing another principle of the bandwidth allocation system in the optical network according to the embodiment of the present invention:
  • a reporting unit 421 is further provided in the ONU/ONT 42 for reporting the bandwidth processing capability parameter of the T-CONT to the OLT, and the receiving is also set in the OLT.
  • the unit 414 is configured to receive the bandwidth processing capability parameter of the T-CONT reported by the reporting unit 421, and store the bandwidth processing capability parameter in the storage unit 311. That is to say, with the system of this embodiment, the bandwidth processing capability parameter of the T-CONT can be actively reported to the OLT by the ONU/ONT after the registration is completed, without the T-CONT supported by the ONU/ONT of different capabilities.
  • the bandwidth processing capability parameter is pre-configured on the OLT.
  • the above two methods can also be combined to enable the OLT to know the bandwidth processing capability parameters of the T-CONT of different ONU/ONTs. For example, if the ONU/ONT can actively report the bandwidth processing capability parameter of the T-CONT, the ONU/ONT will actively report the registration after the registration is completed. If the ONU/ONT cannot actively report the bandwidth processing capability parameter of the T-CONT, The bandwidth processing capability parameter of the T-CONT of the ONU/ONT is pre-configured on the OLT.
  • bandwidth adaptation can be performed according to the bandwidth processing capability parameter of the T-CONT of the ONU/ONT, and the BWmap of the T-CONT of the ONU/ONT is determined, thereby being compatible with ONUs of various different capabilities.
  • /ONT which realizes the allocation and setting of the arbitrary bandwidth value of the transmission layer channel of the ONU/ONT, and ensures the transmission of the uplink packet of the ONU/ONT.
  • the embodiment of the present invention further provides an optical line terminal.
  • the structural block diagram can refer to the OLT 31 in FIG. 3 and the OLT 41 in FIG. 4, and the optical line terminal can implement any transmission layer channel for multiple ONU/ONTs with different capabilities. Bandwidth value assignment and setting.
  • FIG. 5 is a schematic block diagram of an optical network terminal according to an embodiment of the present invention:
  • the optical network terminal 50 includes: a registration unit 51 and an upper unit 52, wherein the registration unit 51 is configured to register with an optical line terminal in the network when accessing the network; After the registration unit completes the registration process, the bandwidth processing capability parameter of the transport layer channel is reported to the optical line terminal.
  • the optical network terminal of the embodiment of the present invention can report the bandwidth processing capability parameter of the transmission layer channel to the optical line terminal, and provide an effective reference condition for the optical line terminal to allocate and set the bandwidth value of the transmission layer bandwidth channel.

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Description

光网络中带宽分配方法、 系统及设备
本申请要求于 2007 年 6 月 22 日提交中国专利局、 申请号为 200710123046.2、 发明名称为"光网络中带宽分配方法、 系统及设备"的中国专 利申请的优先权, 其全部内容通过引用结合在本申请中。
技术领域
本发明光网络技术, 具体涉及一种光网络中带宽分配方法、 系统及设备。 背景技术
PON ( Passive Optical Network, 无源光网络)技术是一种点到多点的光纤 接入技术, 它由局侧的 OLT ( Optical Line Terminal, 光线路终端) 、 用户侧的 ONU( Optical Network Unit,光网络单元)或者 ONT( Optical Network Terminal, 光网络终端) (以下以 ONU/ONT来表示) 以及 ODN ( Optical Distribution Network, 光分配网络)组成。 所谓"无源", 是指 ODN中不含有有源电子器件 及电子电源, 全部由光分路器(Splitter )等无源器件组成, 因此其管理维护的 成本较低。
无源光网络系统主要釆用了树型的拓朴结构, 如图 1所示:
在该拓朴结构中, 多个 ONU或 ONT (后面以 ONU/ONT表示 )通过 ODN共 享 OLT的光纤资源, 因此需要 OLT统一调度 ONU/ONT之间的资源分配。
在现有技术标准中定义了 DBA ( Dynamic Bandwidth Assignment , 动态带 宽分配)协议, 该协议规定 OLT通过向 ONU/ONT内部一个或者多个带宽控制 单元 T-CONT ( Transmission Container, 传输层通道)分配数据授权来控制上 行流量。 为确定分配给一个 T-CONT的带宽值, OLT需要知道该 T-CONT的流 量状态。 现有技术中有两种方法来确定 T-CONT的流量状态, 第一种方法为直 接"状态报告", 即 SR ( Status Reporting, 状态上报)模式; 另一种则被称为"空 闲单元监测", 即 NSR ( Non status Reporting, 非状态上报)模式。
在直接 "状态报告"方法中, 应 OLT的请求, ONU/ONT向 OLT报告其 T-CONT数据包緩冲器长度作为其流量状态, 即通过 ONU/ONT的 DBRu ( Dynamic Bandwidth Report upstream,上行动态带宽上报)中包含的 PCR( Peak Cell Rate, 峰值信元速率) 实现流量状态上报。 OLT—旦获得 T-CONT的流量 状态, 则由其内部的 DBA功能实体以此为 T-CONT重新分配数据授权, 即分配 T-CONT的带宽值。 在状态报告机制中, OLT内部的 DBA功能实体根据上行一 帧内上报的所有 T-CONT的流量状态即 DBRu.PCR,并结合 T-CONT的实际配置 带宽值进行相关计算, 并将计算结果以带宽分配图 BWmap的形式下发给各 ONU/ONT, 完成带宽分配。 各 ONU/ONT根据 BWmap信息在各自的时隙内发 送上行突发数据, 占用上行带宽。
现有技术标准中定义, DBA功能对一个 T-CONT的最小 BWmap定义为 DBRu的长度, 为 2个字节。 GEM ( G-PON Encapsulation Method, GPON封装 方式) 帧长度最小可为 6个字节。 如果 ONU/ONT的 T-CONT同样支持最小 2个 字节的 DBRu、 最小 6个字节的 GEM帧的情况下, 可以配合 OLT的 DBA功能实 体实现每个 T-CONT的任意带宽值的设置和分配。
但是目前很多厂家的 ONU/ONT芯片支持的最小 BWmap长度远远大于 2 个字节, 如果 DBA功能实体分配的 BWmap小于 ONU/ONT芯片支持的最小 值, ONU/ONT的 T-CONT则会因为无法支持这么小的带宽而丟弃上行报文。 发明内容
本发明实施例一方面提供一种光网络中带宽分配方法及系统, 以防止在 OLT与 ONU/ONT互通中 ONU/ONT的上行报文丟失, 兼顾多种不同能力的 ONT, 实现任意传输层通道带宽值的分配和设定。
本发明实施例另一方面还提供一种光线路终端和一种光网络终端,该光网 络终端能够将自己的传输层通道的带宽处理能力参数上报给光线路终端,该光 线路终端可以对多种不同能力的 ONU/ONT, 实现任意传输层通道带宽值的分 配和设定。
为此, 本发明实施例提供如下的技术方案:
一种光网络中带宽分配方法, 包括: 参数;
根据所述带宽处理能力参数,确定所述光网络单元或光网络终端的传输层 通道的带宽分配图;
将所述带宽分配图发送给所述光网络单元或光网络终端。
本发明实施例的方法可以防止在 OLT与 ONU/ONT互通中 ONU/ONT的 上行报文丟失, 兼顾多种不同能力的 ONU/ONT, 实现任意传输层通道带宽值 的分配和设定。
一种光网络中带宽分配系统, 包括: 通过光分配网络连接的光线路终端和 光网络单元或光网络终端,
所述光线路终端包括: 理能力参数;
适配单元, 用于根据所述带宽处理能力参数,确定所述光网络单元或光网 络终端的传输层通道的带宽分配图;
发送单元, 用于将所述带宽分配图发送给所述光网络单元或光网络终端。 本发明实施例的系统在进行动态带宽分配时,通过光线路终端中的适配单 元根据 ONU/ONT的传输层通道的带宽处理能力参数进行带宽适配,确定所述 ONU/ONT 的传输层通道的带宽分配图, 从而可以兼容多种不同能力的 ONU/ONT, 实现对 ONU/ONT的传输层通道任意带宽值的分配和设定, 保证 ONU/ONT的上行艮文的传输。
一种光线路终端, 包括: 力参数;
适配单元, 用于根据所述带宽处理能力参数,确定所述光网络单元或光网 络终端的传输层通道的带宽分配图;
发送单元, 用于将所述带宽分配图发送给所述光网络单元或光网络终端。 本发明实施例的光线路终端可以对多种不同能力的 ONU/ONT, 实现任意 传输层通道带宽值的分配和设定。
一种光网络终端, 包括:
注册单元, 用于在接入网络时, 向所述网络中的光线路终端进行注册; 上报单元, 用于在所述注册单元完成注册过程后, 向所述光线路终端上报 所述传输层通道的带宽处理能力参数。
本发明实施例的光网络终端能够将自己的传输层通道的带宽处理能力参 数上报给光线路终端,为光线路终端进行传输层带宽通道任意带宽值的分配和 设定提供有效的参考条件。
附图说明
图 1是现有技术中无源光网络系统的拓朴结构图;
图 2是本发明实施例的光网络中带宽分配方法的流程图;
图 3是本发明实施例的光网络中带宽分配系统的一种原理框图; 图 4是本发明实施例的光网络中带宽分配系统的另一种原理框图; 图 5是本发明实施例的光网络终端的原理框图。
具体实施方式
为了使本技术领域的人员更好地理解本发明实施例的方案,下面结合附图 和实施方式对本发明实施例作进一步的详细说明。
本发明实施例针对在 ONU/ONT芯片支持的最小 BWmap长度不能满足现 有标准中要求的最小 2个字节的 DBRu、 最小 6个字节的 GEM帧的情况下, 由 ONU/ONT向 OLT上报其 T-CONT带宽处理能力参数, OLT根据不同的 T-CONT带宽处理能力参数进行带宽适配,确定 ONU/ONT的传输层通道的带 宽分配图 BWmap, 然后将确定的 BWmap发送给所述 ONU/ONT, 从而实现 对各 T-CONT 所需的 BWmap 的适配, 使光网络可以兼容多种不同能力的 ONU/ONT, 在 OLT和 ONU/ONT互通中, 实现上行每个 T-CONT的任意带宽 值的设置和分配。
参照图 2, 图 2示出了本发明实施例光网络中带宽分配方法的流程图, 包括 以下步骤:
1. ONU/ONT注册成功后, 主动向 OLT上报 T-CONT的带宽处理能力参 数。
所述 T-CONT的带宽处理能力参数可以包括:报文分片方式、最小可接受 的时隙长度、和最小可接受的报文长度, 所述报文分片方式包括任意长度分片 和固定长度分片。如果报文分片方式为固定长度分片, 则所述传输层通道的带 宽处理能力参数还包括: 固定分片的长度值。 各参数的含义如下:
报文分片方式, 表示任意长度分片还是固定长度分片;
最小可接受的时隙长度, 表示如果分配的 BWmap 小于此长度, 则 ONU/ONT无法发送 DBRu和上行数据艮文; 最小可接受的报文长度,表示如果分配的 BWmap小于此长度, ONU/ONT 可发送 DBRu, 但无法发送上行数据报文。
2. OLT记录接收到的 T-CONT的带宽处理能力参数。
为了方便后续进行带宽适配时对 T-CONT 的带宽处理能力参数的查找, OLT 可以根据该能力参数建立 T-CONT 的能力参数表, 将接收到的每个 ONU/ONT上报的 T-CONT的带宽处理能力参数存储到该表中, 在需要时, 根 据 ONU/ONT的标识就可以查找到对应的 T-CONT的带宽处理能力参数。当然, OLT也可以将 T-CONT的带宽处理能力参数以其它方式存放, 比如, 存储到 一个专用数据库中。
3. OLT根据记录的 T-CONT的带宽处理能力参数进行带宽适配, 即按照 该参数中的传输层通道的最小可接受的时隙长度, 分配 ONU/OLT上报 DBRu 所需的 BWmap。
4. OLT将分配的 DBRu所需的 BWmap下发给 ONU/ONT。
5. ONU/ONT向 OLT上报 T-CONT的 DBRu。
6. OLT根据记录的 T-CONT的带宽处理能力参数进行带宽适配, 即按照 该参数中的传输层通道的最小可接受的时隙长度, 分配 ONU/ONT 上报 T-CONT的 BWmap。
7. OLT将分配的 T-CONT的 BWmap下发给 ONU/ONT。
在上述步骤 1中 ONU/ONT向 OLT上报 T-CONT的带宽处理能力参数时, 可以通过定义新的 PLOAM ( Physical Layer OAM, 物理层操作管理维护 ) 消 息或 OMCI ( ONU Management and Control Interface, 光网络单元管理和控制 接口) 消息上报, 当然也可以通过其它专用消息上报。
下面对通过 PLOAM消息和 OMCI消息上报的具体方式进行说明。
( 1 ) PLOAM消息
定义一个新的上行 PLOAM消息 , 该消息内容包括 ONU/ONT的 T-CONT 带宽处理能力信息的三个参数, 举例说明如下表 1 :
T-CONT带宽处理能力信息上 ^艮消息
字节 内容 描述
1 ONU-ID ONU/ONT标识索引 2 Message ID 消息 ID
3 Segment Mode 报文分片方式:
0x00: 任意长度分片方式
其他: 固定长度分片方式及固定长度参数(单位: 字节)
4 MinTimeSlotLen 最小可接受的时隙长度(单位: 字节)
5 MinPacketLen 最小可接受的报文长度(单位: 字节)
6-12 保留
Figure imgf000008_0001
( 2 ) OMCI消息
定义一个新的 OMCI管理实体(ME, Managed Entity ) , 该 ME的内容包括 ONU/ONT的 T-CONT带宽处理能力信息的三个参数, 举例说明如下:
定义 ME: ONT T-CONT BWmap capability,用于描述 ONU/ONT的 T-CONT 带宽处理能力。 ONT T-CONT BWmap capability ME包含如下表 2所示的关键属 性字段:
Figure imgf000008_0002
表 2
这样, ONU/ONT向 OLT发送 PLOAM消息或 OMCI消息, 通过该消息 将 T-CONT的带宽处理能力参数上报给 OLT。
在上述步骤 6中 OLT进行带宽适配时, 首先要考虑的因素是 T-CONT的 带宽处理能力参数,其次是 DBRu中包含的 DBRu要求的 PCR( Peak Cell Rate, 峰值信元速率)。 而且, 在实际应用中, 每个 T-CONT实际配置的带宽值也可 能不同, 因此, 还要考虑各 T-CONT实际配置的带宽值。 具体可以按照以下方 式分配 ONU/ONT上报 T-CONT的 BWmap:
如果 DBRu中要求的 PCR小于 OLT记录的该 T-CONT的最小可接受的报 文长度, 则按所述最小可接受的报文长度分配该 T-CONT的 BWmap;
如果 DBRu中要求的 PCR大于或等于该 T-CONT的最小可接受的报文长 度, 则可以按照现有标准定义的 DBA计算流程获得应分配的带宽加上用于上 才艮下一帧的 DBRu长度分配该 T-CONT的 BWmap。
另外, 考虑到各种不同的 ONU/ONT, 其支持的 T-CONT的报文分片方式 可以是任意长度分片,也可以是固定长度分片, 因此,对于固定长度分片方式, 在进行带宽适配时,还需要调整该 T-CONT的 BWmap为该 T-CONT的固定分 片的长度值的整数倍, 以保证 ONU/ONT对上行报文带宽的有效分配。
下面举例进一步说明 OLT结合 T-CONT带宽能力参数表、 DBRu要求的 PCR和实际 T-CONT配置带宽值计算 T-CONT的 BWmap的过程。
假如 OLT建立有如下表 3所示的 T-CONT的能力参数表:
Figure imgf000009_0002
Figure imgf000009_0001
T-CONT 1和 T-CONT 2的实际配置均为: 类型 Type2, 带宽参数为保证带 宽 8个字节。
首先根据 T-CONT带宽能力参数表中的最小可接受的时隙长度, 确定分 每个 T-CONT的 DBRu上报所需的 BWmap, 结果如下:
T-CONT 1 DBRu BWmap: 2个字节;
T-CONT 2 DBRu BWmap: 8个字节。
假设 ONU/ONT上报的 T-CONT DBRu要求的 PCR ( DBRu.PCR )如下: T-CONT 1 DBRu.PCR: 7个字节; T-CONT 2 DBRu.PCR: 9个字节。
OLT结合 T-CONT带宽能力参数表中的最小可接受的报文长度、 DBRu.PCR, T-CONT实际配置带宽参数确定分配每个 T-CONT的 BWmap: 对于 T-CONT 1 , 其 DBRu.PCR ( 7个字节)大于最小可接受的报文长度(6 个字节) , 且小于实际配置的带宽参数(8个字节) , 所以可分配 7个字节的 BWmap, 考虑报文分片方式是固定 8个字节, 做适配调整, 最后确定分配 8个 字节的 BWmap。
对于 T-CONT 2,其 DBRu.PCR ( 9个字节)小于最小可接受的报文长度( 16 个字节) , 所以必须分配 16个字节的 BWmap, 即使超过实际配置的带宽参数 ( 8个字节) , 考虑报文分片方式是任意字节分片, 最后确定分配 16个字节的 BWmap。
在该实施例中, 描述了 OLT通过接收 ONU/ONT主动上报的信息, 获取 T-CONT的带宽处理能力参数,进而根据该 T-CONT的带宽处理能力参数进行 带宽适配, 确定 ONU/ONT的 T-CONT的 BWmap的过程。 实际上, 本发明实 施例并不仅局限于这种方式。除此之外,还可以预先在 OLT上配置 ONU/ONT 的 T-CONT的带宽处理能力参数,这样,无需由 ONU/ONT向 OLT上报, OLT 在为 ONU/ONT进行动态带宽分配时,就可以根据这些配置信息来进行带宽适 配的过程, 该过程与上述实施例的步骤 3至步骤 7相同, 在此不再详细描述。
由上述描述可见,本发明实施例中 OLT针对不同能力的 ONU/ONT,通过 带宽适配处理, 为各 ONU/ONT分配合适的 T-CONT的 BWmap, 从而实现了 任意传输层通道带宽值的分配和设定, 保证了 OLT 与 ONU/ONT 互通中 ONU/ONT的上行艮文的传输。
参照图 3 , 图 3示出了本发明实施例的光网络中带宽分配系统的一种原理 框图:
在该系统中包括:通过光分配网络 30连接的 OLT31和多个 ONU/ONT32 , 其中, OLT31 包括: 存储单元 311、 适配单元 312、 发送单元 313。 存储单元 311用于存储 ONU/ONT32的 T-CONT的带宽处理能力参数,所述 T-CONT的 带宽处理能力参数包括: 报文分片方式、 最小可接受的时隙长度、 和最小可接 受的报文长度, 所述报文分片方式包括任意长度分片和固定长度分片。如果报 文分片方式为固定长度分片, 则所述传输层通道的带宽处理能力参数还包括: 固定分片的长度值。各 T-CONT的带宽处理能力参数可以通过预先配置的方式 保存到存储单元 311中, 在 OLT31对 T-CONT进行动态带宽分配时, 由适配 单元 312根据存储单元 311中保存的该 T-CONT的带宽处理能力参数进行带宽 适配, 确定该 T-CONT的 BWmap; 然后由发送单元 313将确定的该 T-CONT 的 BWmap发送给对应的 ONU/ONT。 适配单元 312进行动态带宽分配的过程 与前面本发明实施例的方法中的描述一致, 在此不再赘述。
在该实施例的组网结构中, 有多个 ONU/ONT 通过光分配网络连接到 OLT , 本发明实施例并不仅限于这种组网方式, 也可以应用于只有单个 ONU/ONT的组网方式。下面就以单个 ONU/ONT通过光分配网络连接到 OLT 的组网方式为例, 进一步说明本发明实施例的系统。
参照图 4, 图 4示出了本发明实施例的光网络中带宽分配系统的另一种原 理框图:
与图 3所示实施例的区别在于,在该实施例中,在 ONU/ONT42中还设有 上报单元 421 , 用于向 OLT上报 T-CONT的带宽处理能力参数, 在 OLT中还 设置有接收单元 414, 用于接收上报单元 421上报的 T-CONT的带宽处理能力 参数, 并将该带宽处理能力参数存储到存储单元 311中。 也就是说, 利用该实 施例的系统, 可以由 ONU/ONT在其注册完成后, 主动向 OLT上报 T-CONT 的带宽处理能力参数,而无需将不同能力的 ONU/ONT支持的 T-CONT的带宽 处理能力参数预先配置在 OLT上。
当然, 针对不同的 ONU/ONT, 也可以综合釆用上述两种方式, 使 OLT 获知不同 ONU/ONT的 T-CONT的带宽处理能力参数。 比如, 如果 ONU/ONT 能够主动上报 T-CONT的带宽处理能力参数,则由该 ONU/ONT在注册完成后 进行主动上报; 如果 ONU/ONT不能主动上报 T-CONT的带宽处理能力参数, 则将该 ONU/ONT的 T-CONT的带宽处理能力参数预先配置在 OLT上。
可见,利用本发明实施例的系统,可以根据 ONU/ONT的 T-CONT的带宽 处理能力参数进行带宽适配, 确定该 ONU/ONT的 T-CONT的 BWmap, 从而 可以兼容多种不同能力的 ONU/ONT, 实现对 ONU/ONT的传输层通道任意带 宽值的分配和设定, 保证 ONU/ONT的上行报文的传输。 本发明实施例还提供了一种光线路终端, 其结构框图可参照图 3 中的 OLT31和图 4中的 OLT41 , 该光线路终端可以对多种不同能力的 ONU/ONT , 实现任意传输层通道带宽值的分配和设定。
参照图 5, 图 5是本发明实施例的光网络终端的原理框图:
该光网络终端 50包括: 注册单元 51和上 ^艮单元 52, 其中, 注册单元 51 用于在接入网络时, 向所述网络中的光线路终端进行注册; 上 ^艮单元 52用于 在所述注册单元完成注册过程后,向所述光线路终端上报传输层通道的带宽处 理能力参数。
本发明实施例的光网络终端能够将自己的传输层通道的带宽处理能力参 数上报给光线路终端,为光线路终端进行传输层带宽通道任意带宽值的分配和 设定提供有效的参考条件。
以上对本发明实施例所提供的系统、方法及设备进行了详细介绍, 本文中 应用了具体实施方式对本发明进行了阐述,以上实施例的说明只是用于帮助理 解本发明的系统及方法; 同时, 对于本领域的一般技术人员, 依据本发明的思 想, 在具体实施方式及应用范围上均会有改变之处, 综上所述, 本说明书内容 不应理解为对本发明的限制。

Claims

权 利 要 求
1、 一种光网络中带宽分配方法, 其特征在于, 包括:
4冬端获取光网络单元或光网络终^ '宽处理能力 参数;
根据所述带宽处理能力参数确
通道的带宽分配图;
将所述带宽分配图发送给所述光网络单元或光网络终端。
2、 根据权利要求 1所述的方法, 其特征在于, 所述光线路终端获取根据 光网络单元或光网络终端的传输层通道的带宽处理能力参数的过程包括: 所述光线路终端通过接收所述光网络单元或光网络终端的上报信息 ,获取 所述传输层通道的带宽处理能力参数。
3、 根据权利要求 1所述的方法, 其特征在于, 所述光线路终端获取根据 光网络单元或光网络终端的传输层通道的带宽处理能力参数的过程包括: 所述光线路终端通过预置的配置信息,获取所述传输层通道的带宽处理能 力参数。
4、 根据权利要求 1所述的方法, 其特征在于, 所述传输层通道的带宽处 理能力参数包括: 报文分片方式、 最小可接受的时隙长度、 和最小可接受的报 文长度, 所述 文分片方式包括任意长度分片和固定长度分片。
5、 根据权利要求 4所述的方法, 其特征在于, 所述根据所述光网络单元 或光网络终端的传输层通道的带宽处理能力参数确定所述传输层通道的带宽 分配图的过程包括:
按照所述传输层通道的最小可接受的时隙长度分配所述光网络单元或光 网络终端上报 DBRu的带宽分配图;
当所述光线路终端获取 DBRu状态报告后,如果 DBRu中要求的峰值信元 速率小于所述传输层通道的最小可接受的报文长度,则按所述最小可接受的报 文长度分配所述传输层通道的带宽分配图,如果 DBRu中要求的峰值信元速率 大于或等于所述传输层通道的最小可接受的报文长度,则按实际计算的带宽加 上 DBRu长度分配所述传输层通道的带宽分配图。
6、 根据权利要求 5所述的方法, 其特征在于, 所述传输层通道的带宽处理能力参数还包括: 固定分片的长度值; 如果所述传输层通道的报文分片方式是固定长度分片,则所述根据所述光 网络单元或光网络终端的传输层通道的带宽处理能力确定所述传输层通道的 带宽分配图的过程还包括:调整所述传输层通道的带宽分配图为所述传输层通 道的固定分片的长度值的整数倍。
7、 一种光网络中带宽分配系统, 包括: 通过光分配网络连接的光线路终 端和光网络单元或光网络终端, 其特征在于, 所述光线路终端包括: 理能力参数;
适配单元,用于根据所述带宽处理能力参数确定所述光网络单元或光网络 终端的传输层通道的带宽分配图;
发送单元, 用于将所述带宽分配图发送给所述光网络单元或光网络终端。
8、 根据权利要求 7所述的系统, 其特征在于,
所述光网络单元或光网络终端包括: 上报单元, 用于向所述光线路终端上 报所述传输层通道的带宽处理能力参数;
所述光线路终端还包括: 接收单元, 用于接收所述上报单元上报的所述传 输层通道的带宽处理能力参数,并将所述传输层通道的带宽处理能力参数存储 到所述存储单元中。
9、 一种光线路终端, 其特征在于, 包括: 力参数;
适配单元,用于根据所述带宽处理能力参数确定所述光网络单元或光网络 终端的传输层通道的带宽分配图;
发送单元, 用于将所述带宽分配图发送给所述光网络单元或光网络终端。
10、 根据权利要求 9所述的光线路终端, 其特征在于, 所述光线路终端还 包括:
接收单元,用于接收所述上报单元上报的所述传输层通道的带宽处理能力 参数, 并将所述传输层通道的带宽处理能力参数存储到所述存储单元中。
11、 一种光网络终端, 其特征在于, 包括: 注册单元, 用于在接入网络时, 向所述网络中的光线路终端进行注册; 上报单元, 用于在所述注册单元完成注册过程后, 向所述光线路终端上报 传输层通道的带宽处理能力参数。
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