WO2009049522A1 - Procédé, système et nœud de réseau pour transmettre des données - Google Patents

Procédé, système et nœud de réseau pour transmettre des données Download PDF

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Publication number
WO2009049522A1
WO2009049522A1 PCT/CN2008/072529 CN2008072529W WO2009049522A1 WO 2009049522 A1 WO2009049522 A1 WO 2009049522A1 CN 2008072529 W CN2008072529 W CN 2008072529W WO 2009049522 A1 WO2009049522 A1 WO 2009049522A1
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WIPO (PCT)
Prior art keywords
network node
root
data
leaf
unit
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PCT/CN2008/072529
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English (en)
French (fr)
Inventor
Tao Cai
Jianfei He
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Huawei Technologies Co., Ltd.
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Application filed by Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Publication of WO2009049522A1 publication Critical patent/WO2009049522A1/zh

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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04JMULTIPLEX COMMUNICATION
    • H04J14/00Optical multiplex systems
    • H04J14/02Wavelength-division multiplex systems
    • H04J14/0227Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
    • H04J14/0241Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths
    • H04J14/0242Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON
    • H04J14/0245Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON for downstream transmission, e.g. optical line terminal [OLT] to ONU
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04JMULTIPLEX COMMUNICATION
    • H04J14/00Optical multiplex systems
    • H04J14/02Wavelength-division multiplex systems
    • H04J14/0227Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
    • H04J14/0241Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths
    • H04J14/0242Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON
    • H04J14/0249Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON for upstream transmission, e.g. ONU-to-OLT or ONU-to-ONU
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04JMULTIPLEX COMMUNICATION
    • H04J14/00Optical multiplex systems
    • H04J14/02Wavelength-division multiplex systems
    • H04J14/0226Fixed carrier allocation, e.g. according to service
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04JMULTIPLEX COMMUNICATION
    • H04J14/00Optical multiplex systems
    • H04J14/02Wavelength-division multiplex systems
    • H04J14/0227Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04JMULTIPLEX COMMUNICATION
    • H04J14/00Optical multiplex systems
    • H04J14/02Wavelength-division multiplex systems
    • H04J14/0278WDM optical network architectures
    • H04J14/0282WDM tree architectures

Definitions

  • the present invention relates to optical network technologies, and in particular, to a method, system and network node for transmitting data in an optical network.
  • the light path refers to the light path from end to end.
  • Multiple network nodes in the aggregation network are capable of communicating on the end-to-end optical path established between the network nodes.
  • the data to be transmitted is modulated on the light emitted by the own laser, and the modulated light is transmitted to another network node.
  • the number of lasers required to be set on each network node in the aggregation network is determined by the number of optical paths formed, for example, when there are 4 in one aggregation network.
  • the network node as shown in Figure 1, in order to realize that each network node can send data to each other, it is necessary to set three lasers in each network node to form three optical paths, respectively, and three other than itself.
  • the optical path formed by the network node communicates, so that the aggregation network containing four network nodes requires a total of 12 lasers. Therefore, when using the prior art method, when the aggregation network contains multiple network nodes, the total photochemical cost of the aggregation network is high. Summary of the invention
  • the embodiments of the present invention provide a method, a system, and a network node for transmitting data, so as to save the number of lasers in the aggregation network and reduce the cost of all-opticalization of the aggregation network.
  • a method of transmitting data comprising:
  • the leaf network node In the symmetric tree established by the receiving network node as the root network node, the leaf network node reflects the downlink light sent by the root network node, and sends the data by using the reflected uplink light to The root network node.
  • a system for transmitting data comprising: a root network node and a leaf network node in a symmetric tree established by a receiving network node as a root network node;
  • a root network node configured to send downlink light to the leaf network node, and receive data sent by the leaf network node; and the obtained uplink optical sends data to the root network node.
  • a network node comprising:
  • An optical processing unit configured to reflect downlink light sent by the root network node, or forward the received downlink optical to another adjacent network node;
  • a data sending unit configured to send, by using the uplink optical transmission data obtained by the optical processing unit, the data to the root network node.
  • a network node comprising:
  • An optical add/drop multiplexer configured to broadcast the downlink light generated by the laser to a leaf network node in a symmetric tree having a network node where the network node is located;
  • a data receiving unit configured to receive data sent by the leaf network node.
  • the method, system and network node provided by the embodiments of the present invention perform the downlink light from the root network node in the symmetric tree established by the receiving network node as the root network node. Reflecting, and using the upstream light obtained after the reflection to send data to the root network node. In this way, it is only necessary to set a laser in each network node.
  • the uplink obtained by the laser of the receiving network node is reflected by the downlink light sent by the symmetric tree of the root network node. Light, send data to the receiving network node.
  • FIG. 1 is a diagram showing a laser setting when four network nodes are included in the prior art
  • FIG. 2a is a schematic diagram of a network node in an optical transport network according to an embodiment of the present invention
  • FIG. 2b is a flowchart of a method in FIG. 2a according to an embodiment of the present invention
  • FIG. 3 is a structural diagram of a system for transmitting data according to an embodiment of the present invention.
  • FIG. 4 is a diagram of a laser setting when four network nodes are provided according to an embodiment of the present invention.
  • the method provided by the embodiment of the present invention mainly includes: in a symmetric tree established by a receiving network node as a root network node, the leaf network node reflects the downlink light from the root network node, and uses the reflected light obtained by the reflection. Send data to the root network node.
  • the light transmitted from the root network node to the leaf network node is referred to as downlink light
  • the light transmitted from the leaf network node to the root network node is referred to as uplink light.
  • the data transmission request may be sent to the root network node, and after receiving the data transmission request sent by the leaf network node, the root network node sends an allow response to the leaf network node. After receiving the permission response, the leaf network node sends data to the root network node by using the uplink light obtained by reflecting the downlink light sent by the root network node.
  • FIG. 2a is a schematic diagram of a network node in an optical transport network.
  • the method provided by the embodiment of the present invention is described in detail below by taking a symmetric tree in which the network node A is a network node.
  • the other network nodes B to I are leaf network nodes.
  • the network node 1 sends data to the network node A as an example.
  • Figure 2b is a flowchart of the method of Figure 2a according to an embodiment of the present invention. As shown in Figure 2b, the method includes the following steps: Step 201: Establish a symmetric tree extension with each network node as a root node in the aggregation network. Park.
  • a symmetric tree topology with each network node as a root node needs to be established in the aggregation network.
  • the network nodes in the mesh (Mesh) aggregation network It is possible to become a receiving network node. Therefore, each network node can be used as a root network node to establish a symmetric tree.
  • each network node Since each network node does not send data when the network element is started, but can send control packets, each network node in the aggregation network can exchange control information, so the shortest path bridge algorithm can be used to generate the symmetric tree topology, and Each network node stores the topology information of its own symmetric tree, and the root network node information in the symmetric tree in which it is located and the connection relationship between the network nodes can be obtained from the topology information saved by itself. .
  • the method for generating a symmetric tree topology by using the shortest path bridge algorithm is a prior art, and details are not described herein again.
  • the operation of establishing a symmetric tree topology in this step is an operation on the signaling plane.
  • Step 202 The root network node in each symmetric tree broadcasts downlink light of a specific wavelength in a symmetric tree that is itself a network node.
  • the root network node in different symmetric trees can send downlink light of different wavelengths
  • no step 203 the network node 1 sends a data transmission request to the network node A.
  • the network node I can find the symmetric tree with the network node A as the root network node according to the symmetric tree topology information saved by itself, and use the symmetric tree to send a data transmission request to the network node A.
  • the network node I may send the data transmission request to the network node A via the network node F or the network node according to the symmetric tree topology information; or, the data transmission request is sent to the network node H, the network node 8,
  • the network node B sends to the network node A; or uses other paths.
  • the data transmission request may include the identifier of the network node A, and after receiving the request, the other network node determines that it is not sent to itself according to the identifier of the network node A. The request is forwarded until it is sent to network node A.
  • the operation of transmitting a data transmission request in this step is still an operation on the signaling plane.
  • Step 204 After receiving the data transmission request sent by the network node 1, the network node A sends an permission response to the network node 1 by using a dynamic bandwidth allocation (DBA, Dynamic Bandwidth s tr ibut ion) algorithm.
  • DBA Dynamic Bandwidth s tr ibut ion
  • the data transmission time of the network node I that sends the request may be allocated by the DBA algorithm, and the data transmission time may include a time point at which the network node 1 sends data, and may also include a length of time for data transmission.
  • the DBA algorithm is only one of the methods used in the embodiments of the present invention to allocate data transmission time of the network node to avoid conflicts. Of course, other algorithms may also be used to allocate data transmission time.
  • the permission response sent to the network node 1 may include the identifier of the network node I, and may also include the specific wavelength information of the downlink light broadcast by the network node A.
  • each leaf network node may determine whether it is sent to itself according to the identifier of the network node I included in the permission response, and if not, forward the permission response until it is sent to the network node 1.
  • the permission response may further include data transmission time information allocated by the DBA algorithm.
  • Step 205 After receiving the permission response sent by the network node A, the network node I reflects the downlink light of the specific wavelength sent by the network node A, and sends the data to the network node A by using the uplink light obtained by the reflection.
  • the network node 1 After the network node 1 receives the permission response, it determines, according to the identifier of the network node I included in the permission response, that the permission response is sent to itself, and according to the specific wavelength information included in the permission response, The downward light of the wavelength is reflected. The data is sent to the network node A at the time indicated by the data transmission time information included in the permission response.
  • the network node A can also send the downlink light of the specific wavelength and the permission response to the specific port of the network node 1.
  • the network node I After receiving the permission response, the network node I reflects the downlink light received from the specific port. And send data to the network node A at the time indicated by the data transmission time information included in the permission response. In this manner, the root network node does not need to carry specific wavelength information in the allowed response, and the leaf network node does not need to identify the specific wavelength of light based on the specific wavelength information in the allowed response.
  • the leaf network nodes in each symmetric tree have two working modes, one is a detection mode, and the other is a remote modulation mode.
  • the working mode of the device is the detection mode, and the received optical signal is forwarded, so that the downlink optical broadcast by the root network node can reach the leaf network node that sends the request.
  • the network node switches its working mode to the far-end modulation mode, reflects the downlink light of a specific wavelength, and modulates the data to be transmitted on the upward light obtained after the reflection, and The modulated uplink light is sent to the root network node.
  • the root network node in each symmetric tree can broadcast the downlink light in the symmetric tree with itself as the root network node after receiving the data transmission request sent by the leaf network node.
  • Step 202 is performed after step 203. In this manner, the execution order of steps 202 and 204 is not limited.
  • the uplink light obtained by the downlink light reflected by the leaf sends data to the root network node.
  • FIG. 3 is a structural diagram of a system for transmitting data according to an embodiment of the present invention.
  • the system mainly includes: a root network node 300 and a leaf in a symmetric tree established by using a receiving network node as a root network node.
  • Network node 310 The root network node 300 and a leaf in a symmetric tree established by using a receiving network node as a root network node.
  • the root network node 300 is configured to broadcast downlink light to the leaf network node 310 and receive data sent by the leaf network node 310.
  • the leaf network node 310 is configured to reflect the downlink light broadcast by the root network node 300, and send the data to the root network node 300 by using the reflected uplink light.
  • the leaf network node 300 is a leaf network node in the symmetric tree to send data to the root network node. Other leaf network nodes that do not need to transmit data forward the received downlink light without reflecting the downstream light.
  • the leaf network node 310 may be further configured to send a data transmission request to the root network node 300, and after receiving the permission response that is sent by the root network node and including the identifier of the network node, perform the broadcast by the root network node 300.
  • the downward light reflects the operation.
  • the root network node 300 can also be configured to receive the data transmission request sent by the leaf network node 310. Thereafter, an allowed response including the leaf network node 310 identity is sent to the leaf network node 310.
  • the other leaf network node After receiving the permission response, the other leaf network node determines that the permission response is not sent to itself according to the permission response identified by the leaf network node 310 included in the permission response, and forwards the permission response to the adjacent leaf network node.
  • the leaf network node 310 may include: an optical processing unit 311 and a data transmitting unit 312.
  • the optical processing unit 311 is configured to reflect the downlink optical broadcast by the root network node 300, or forward the received downlink optical to the neighboring other network nodes.
  • the data sending unit 312 is configured to send the uplink optical transmission data obtained by the optical processing unit 311 to the network node 300.
  • the leaf network node 310 may further include: a signaling interaction unit 31 3, configured to send a data transmission request, and after receiving the permission response including the identifier of the network node where the network node is located, notify the optical processing unit 311 to perform the broadcast of the root network node 300.
  • the data sending unit 312 may include: a data acquiring unit 3121, a modulating unit 3122, and a sending unit 3123.
  • the data obtaining unit 3121 is configured to acquire data to be sent.
  • the modulating unit 3122 is configured to modulate the received uplink light from the root network node 300 by using the data acquired by the data acquiring unit 3121.
  • the transmitting unit 3123 is configured to send the uplink light modulated by the modulation unit 3122.
  • the leaf network node 310 may further include: a topology information storage unit 314, configured to store topology information of a symmetric tree in which the network node is located.
  • the signaling interaction unit 31 3 is configured to send, according to the topology information stored by the topology information storage unit 314, a data transmission request to the root network node 300 of the symmetric tree in which it is located.
  • the leaf network node 310 When the leaf network node 310 wants to send data to an aggregation network node in the aggregation network, it searches for the network node with the aggregation network node as the root network node according to the topology information stored in the topology information storage unit 314.
  • the symmetric tree topology information and according to the topology information, sends a data transmission request to the root network node in the symmetric tree.
  • the leaf network node 310 can be a semiconductor optical amplifier (RSOA, Ref Lective Semiconductor opt ica l Ampl if ier ).
  • the RSOA can have two working modes, one is a detection mode, and the other is a remote modulation mode.
  • the notification light processing unit 311 switches the operation mode to the remote modulation mode, and performs the downlink light of the specific wavelength according to the specific wavelength information included in the permission response.
  • the reflection, transmission unit 312 modulates the data to be transmitted on the upstream light formed by the reflection of the downlink light of the specific wavelength, and transmits the modulated uplink light to the root network node 300.
  • the root network node 300 may include: a laser 301, a data receiving unit 302, and an optical add/drop multiplexer 303.
  • a laser 301 is used to generate the downward light.
  • the optical add/drop multiplexer 303 is configured to broadcast the downlink light generated by the laser 301 to the leaf network node in the symmetric tree with the network node where the network node is located as the root network node.
  • the data receiving unit 302 is configured to receive data sent by the leaf network node 310.
  • the root network node 300 may further include: a signaling interaction unit 304, configured to receive a data transmission request sent by the leaf network node 310, and allocate a data transmission time to the leaf network node 310 that sends the data transmission request by using a DBA algorithm, and The leaf network node 310 transmits an allow response in response to the data transmission time information and the leaf network node 310 identity.
  • a signaling interaction unit 304 configured to receive a data transmission request sent by the leaf network node 310, and allocate a data transmission time to the leaf network node 310 that sends the data transmission request by using a DBA algorithm, and The leaf network node 310 transmits an allow response in response to the data transmission time information and the leaf network node 310 identity.
  • the root network node 300 further includes: a wavelength adjustment unit 305, configured to adjust, according to a symmetric tree established by the network node where the network node is located, the downlink light broadcasted by the laser 301 to a specific wavelength of the downlink light corresponding to the symmetric tree. .
  • Each symmetry tree can correspond to a specific wavelength, so that each leaf network node can distinguish which downlink node sends the downlink light according to a specific wavelength to avoid collision.
  • the optical add/drop multiplexer 303 can transmit the downlink optical of the specific wavelength to a specific port of the leaf network node, and the signaling interaction unit 304 can also send the permission response to the specific port of the leaf network node. In this way, after the leaf network node receives the permission response from the specific port, it can reflect the downlink light received from the specific port.
  • the above signaling interaction unit 304 includes: a signaling receiving unit 3041, a DBA unit 3042, an answer generating unit 3043, and a response transmitting unit 3044.
  • the signaling receiving unit 3041 is configured to receive a data transmission request sent by the leaf network node 310.
  • the DBA unit 3042 is configured to allocate a data transmission time to the leaf network node 310 that sends the data transmission request by using the DBA algorithm after the signaling receiving unit 3041 receives the data transmission request.
  • the response generating unit 3043 is configured to generate an allowed response including the data sending time information and the leaf network node identifier according to the data sending time allocated by the DBA unit 3042.
  • the response transmitting unit 3044 is configured to send the permission response generated by the response generating unit 3043.
  • the root network node 300 may further include: a topology information storage unit 306, configured to store topology information of a symmetric tree in which the network node is located.
  • the wavelength adjustment unit 305 adjusts the downward light generated by the laser 301 to the downward light of the specific wavelength corresponding to the symmetric tree according to the topology information of the symmetric tree stored by the topology information storage unit 306.
  • the optical add/drop multiplexer 303 broadcasts the downlink light in the symmetric tree according to the topology information of the symmetric tree stored by the topology information storage unit 306.
  • some network nodes may serve as both a root network node of a symmetric tree and a leaf network node of another symmetric tree, and therefore, may include the structure of the root network node and the leaf network node at the same time, which includes the above Network nodes of the root network node and leaf network node structure are also within the scope of the present invention.
  • the method, system and network node provided by the embodiment of the present invention reflect the downlink light from the root network node in a symmetric tree established by a cluster network node as a root network node. And using the upstream light obtained after the reflection to send data to the root network node. In this way, it is only necessary to set a laser in each network node.
  • the uplink obtained by the laser of the receiving network node is reflected by the downlink light sent by the symmetric tree of the root network node. Light, send data to the receiving network node.
  • each network node when there are four network nodes in the aggregation network, as shown in FIG. 4, in order to realize that each network node can send data to each other, only one laser needs to be set in each network node, and the other three network nodes can be configured.
  • the uplink light formed by the reflection of the downlink light transmitted by the laser in the network node is used to transmit data, and it is not necessary to set three lasers in each network node, so that in an aggregation network where there are four network nodes, a total of Compared with the prior art method of setting 12 lasers, the number of lasers is greatly reduced, and the cost of total photochemicalization of the convergence network is reduced.

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
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  • Data Exchanges In Wide-Area Networks (AREA)

Description

一种发送数据的方法、 系统和网络节点 技术领域
本发明涉及光网络技术, 特别涉及一种光网络中发送数据的方法、 系统和 网络节点。
背景技术
随着端到端技术、 组播电视等新业务的不断涌现, 用户对接入带宽的需求 日益增加, 光网络技术应运而生。 随着光接入网的不断发展, 全光网络是一 个主要的技术方向, 但汇聚网的全光化是主要的技术瓶颈。
目前, 在汇聚网中, 是基于光路 ( Light Pa th ) 实现通信的。 光路是指从 端到端的光路。 汇聚网中的多个网络节点能够在网络节点之间建立的端到端 的光路上进行通信。 当汇聚网中一个网络节点需要向另一个网络节点发送数 据时, 将要发送的数据调制在自身激光器发出的光上, 将该调制后的光发送 给另一网络节点。
但是, 现有技术中这种基于光路发送数据的方法, 需要在汇聚网中的每一 个网络节点上设置的激光器数目是由形成光路的个数决定的, 例如, 当一个 汇聚网中有 4个网络节点时, 如图 1所示, 为了实现各网络节点之间可以相 互发送数据, 就需要在每一个网络节点中设置 3个激光器, 以便形成 3条光 路, 分别在与除了自身的其它 3 个网络节点形成的光路上进行通信, 这样该 含有 4个网络节点的汇聚网就共需要 12个激光器。 因此, 釆用现有技术的方 法时, 当汇聚网中含有多个网络节点时, 就会使得汇聚网的全光化成本很高。 发明内容
本发明实施例提供了一种发送数据的方法、 系统和网络节点, 以便于节省 汇聚网中激光器的数目, 降低汇聚网全光化的成本。
一种发送数据的方法, 该方法包括:
在以接收端网络节点为根网络节点所建立的对称树中, 叶网络节点将所述 根网络节点发送的下行光进行反射, 并利用反射后得到的上行光发送数据到 所述根网络节点。
一种发送数据的系统, 该系统包括: 在以接收端网络节点为根网络节点所 建立的对称树中的根网络节点和叶网络节点;
根网络节点, 用于向所述叶网络节点发送下行光, 接收所述叶网络节点发 送的数据; 后得到的上行光发送数据到所述根网络节点。
一种网络节点, 该网络节点包括:
光处理单元, 用于将根网络节点发送的下行光进行反射, 或将接收到的下 行光转发给相邻的其它网络节点;
数据发送单元, 用于利用所述光处理单元反射后得到的上行光发送数据到 所述根网络节点。
一种网络节点, 该网络节点包括:
激光器, 用于产生下行光;
光分插复用器, 用于向以自身所在网络节点为根网络节点的对称树中的叶 网络节点广播所述激光器产生的下行光;
数据接收单元, 用于接收所述叶网络节点发送的数据。
由以上技术方案可以看出, 本发明实施例提供的方法、 系统和网络节点, 在以接收端网络节点为根网络节点所建立的对称树中, 叶网络节点将来自根 网络节点的下行光进行反射, 并利用反射后得到的上行光发送数据到根网络 节点。 这样, 只需在每个网络节点中设置一个激光器, 当网络节点需要发送 数据时, 利用接收端网络节点的激光器在以自身为根网络节点的对称树中发 送的下行光进行反射后得到的上行光, 发送数据到该接收端网络节点。 当网 络中有多个网络节点之间需要互相发送数据时, 无需在每个网络节点中为了 形成多条光路设置多个激光器, 大大节省了汇聚网中激光器的数目, 降低了 汇聚网全光化的成本。 附图说明
图 1为现有技术中含有 4个网络节点时的激光器设置图;
图 2a为本发明实施例提供的光传送网中网络节点示意图;
图 2b为本发明实施例提供的以图 2a为例的方法流程图;
图 3为本发明实施例提供的发送数据的系统结构图;
图 4为本发明实施例提供的含有 4个网络节点时的激光器设置图。
具体实施方式
为了使本发明的目的、 技术方案和优点更加清楚, 下面结合附图和具体实 施例对本发明进行详细描述。
本发明实施例提供的方法主要包括: 在以一个接收端网络节点为根网络节 点所建立的对称树中, 叶网络节点将来自根网络节点的下行光进行反射, 并 利用反射后得到的上行光发送数据到该根网络节点。
需要说明的是, 在本发明实施例中, 将从根网络节点发送至叶网络节点的 光称为下行光, 将从叶网络节点发送至根网络节点的光称为上行光。
当叶网络节点要向根网络节点发送业务数据时, 可以向该根网络节点发送 数据传输请求, 该根网络节点接收到叶网络节点发送的数据传输请求后, 向 该叶网络节点发送允许应答, 该叶网络节点接收到允许应答后, 利用将根网 络节点发送的下行光进行反射后得到的上行光发送数据到根网络节点。
图 2a为光传送网中网络节点示意图, 下面以网络节点 A为^ =艮网络节点时 所在的对称树为例, 对本发明实施例提供的方法进行详细的描述。 在以网络 节点 A为根网络节点的对称树中, 其它网络节点 B至 I都为叶网络节点。 该 实施例中, 以网络节点 I向网络节点 A发送数据为例。 图 2b为本发明实施例 提供的以图 2a为例的方法流程图, 如图 2b所示, 该方法包括以下步骤: 步骤 201 : 在汇聚网中建立以各网络节点为根节点的对称树拓朴。
在该方法中首先需要在汇聚网中建立以各网络节点为根节点的对称树拓 朴, 当汇聚网中有多个网络节点时, 由于网状(Mesh ) 汇聚网中的网络节点 都可能成为接收端网络节点, 所以, 可以以每一个网络节点为根网络节点分 别建立对称树。 由于网元在启动时, 每个网络节点都不发送数据, 但可以发 送控制报文, 汇聚网中的各网络节点可以交换控制信息, 因此可以使用最短 路径网桥算法生成对称树拓朴, 且每一个网络节点中都保存有自身所在对称 树的拓朴信息, 从自身保存的拓朴信息中可以获取到在自身所在的对称树中 的根网络节点信息、 以及各网络节点之间的连接关系。 其中, 利用最短路径 网桥算法生成对称树拓朴的方法为现有技术, 在此不再赘述。
本步骤中建立对称树拓朴的操作是信令面上的操作。
步骤 202: 各对称树中的根网络节点在以自身为网络节点的对称树中广播 各自特定波长的下行光。
本步骤中, 不同对称树中的根网络节点可以发送不同波长的下行光, 用不 步骤 203: 网络节点 I向网络节点 A发送数据传输请求。
在该步骤中, 网络节点 I可以根据自身保存的对称树拓朴信息, 查找以网 络节点 A为根网络节点的对称树, 并利用该对称树向该网络节点 A发送数据 传输请求。
网络节点 I可以根据对称树拓朴信息,将该数据传输请求经由网络节点 F、 网络节点(、 网络节点 B发送给网络节点 A; 或者, 将该数据传输请求经由网 络节点 H、 网络节点8、 网络节点 B发送给网络节点 A; 或者釆用其它路径。 该数据传输请求中可以包含网络节点 A 的标识, 其它网络节点接收到该请求 后, 根据该网络节点 A 的标识判断不是发送给自己的就将该请求进行转发, 直至发送至网络节点 A。
本步骤中发送数据传输请求的操作仍是信令面上的操作。
步骤 204: 网络节点 A接收到网络节点 I发送的数据传输请求后, 通过动 态带宽分配 ( DBA, Dynamic Bandwide di s tr ibut ion ) 算法, 向网络节点 I 发送允许应答。 通过 DBA算法, 为各发送请求的网络节点分配数据发送的时间, 从而避免 多个网络节点同时发送数据造成的冲突。 通过该 DBA算法, 可以为该发送请 求的网络节点 I分配数据发送时间, 该数据发送时间可以包括网络节点 I发 送数据的时间点,还可以包括数据发送的时间长度。 DBA算法只是本发明实施 例釆用的其中一种方式来进行网络节点的数据发送时间的分配, 以避免冲突, 当然, 也可以釆用其它算法来进行数据发送时间的分配。
本步骤中, 向网络节点 I发送的允许应答可以包含网络节点 I的标识, 还 可以包含网络节点 A广播的下行光的特定波长信息。 各叶网络节点接收到该 允许应答后, 可以根据该允许应答中包含的网络节点 I 的标识判断是否是发 送给自身的, 如果不是, 则转发该允许应答, 直至发送至网络节点 I。 另外, 该允许应答中还可以包含通过 DBA算法分配的数据发送时间信息。
步骤 205: 网络节点 I接收到网络节点 A发送的允许应答后, 将网络节点 A发送的特定波长的下行光进行反射,并利用反射后得到的上行光发送数据到 网络节点 A。
本步骤中, 网络节点 I接收到的允许应答后, 根据该允许应答中包含的网 络节点 I 的标识判断该允许应答是发送给自己的, 并根据该允许应答中包含 的特定波长信息, 将特定波长的下行光进行反射。 并在允许应答中包含的数 据发送时间信息指示的时间发送数据到网络节点 A。
另外, 网络节点 A还可以将特定波长的下行光和允许应答发送到网络节点 I的特定端口, 网络节点 I从该特定端口接收到允许应答后, 将从该特定端口 接收到的下行光进行反射, 并在允许应答中包含的数据发送时间信息指示的 时间发送数据到网络节点 A。 釆用这种方式时, 根网络节点无需在允许应答中 携带特定波长信息, 叶网络节点也无需根据允许应答中的特定波长信息识别 该特定波长的光。
本实施例中,各对称树中的叶网络节点有两种工作模式,一种是检测模式, 另一种是远端调制模式。 各网络节点没有接收到发送给自身的允许应答时, 自身的工作模式都为检测模式, 将接收到的光信号转发出去, 从而使得根网 络节点广播的下行光能够达到发送请求的叶网络节点。 当网络节点接收到发 送给自身的允许应答时, 将自身的工作模式切换为远端调制模式, 将特定波 长的下行光进行反射, 并将要发送的数据调制在反射后得到的上行光上, 并 将该调制后的上行光发送给根网络节点。
另外, 在图 2b 所示的流程中, 各对称树中的根网络节点可在接收到叶网 络节点发送的数据传输请求后, 再在以自身为根网络节点的对称树中广播下 行光。 即将步骤 202放在步骤 203之后执行, 在这种方式下, 不限定步骤 202 和步骤 204的执行先后顺序。
在上述流程中, 当汇聚网的网络结构比较简单, 网络节点数目较少时, 叶 送的下行光反射后得到的上行光发送数据到根网络节点。
图 3为本发明实施例提供的发送数据的系统结构图, 如图 3所示, 该系统 主要包括: 在以接收端网络节点为根网络节点所建立的对称树中的根网络节 点 300和叶网络节点 310。
根网络节点 300,用于向叶网络节点 310广播下行光,接收叶网络节点 310 发送的数据。
叶网络节点 310, 用于将根网络节点 300广播的下行光进行反射, 并利用 反射后得到的上行光发送数据到根网络节点 300。
其中, 叶网络节点 300为该对称树中要发送数据到根网络节点的叶网络节 点。 不需要发送数据的其它叶网络节点将接收到的下行光进行转发, 不将该 下行光进行反射。
另外, 叶网络节点 310, 还可以用于向根网络节点 300发送数据传输请求, 接收到所述根网络节点发送的包含自身网络节点标识的允许应答后, 执行所 述将根网络节点 300广播的下行光进行反射的操作。
根网络节点 300, 还可以用于接收到叶网络节点 310发送的数据传输请求 后, 向该叶网络节点 310发送包含叶网络节点 310标识的允许应答。
其它叶网络节点, 接收到允许应答后, 根据该允许应答中包含的叶网络节 点 310标识的允许应答, 判断该允许应答不是发送给自身的, 将该允许应答 转发给相邻的叶网络节点。
其中, 叶网络节点 310可以包括: 光处理单元 311和数据发送单元 312。 光处理单元 311 , 用于将根网络节点 300广播的下行光进行反射, 或将接 收到的下行光转发给相邻的其它网络节点。
数据发送单元 312 , 用于利用光处理单元 311反射后得到的上行光发送数 据到才艮网络节点 300。
该叶网络节点 310还可以包括: 信令交互单元 31 3 , 用于发送数据传输请 求, 接收包含自身所在网络节点标识的允许应答后, 通知光处理单元 311 执 行所述将根网络节点 300 广播的下行光进行反射的操作; 接收到包含其它网 络节点标识的允许应答或没有接收到允许应答后, 通知光处理单元 311 执行 所述将接收到的下行光转发给相邻的其它网络节点的操作。
其中, 数据发送单元 312可以包括: 数据获取单元 3121、 调制单元 3122 和发送单元 3123。
数据获取单元 3121 , 用于获取要发送的数据。
调制单元 3122 , 用于利用数据获取单元 3121获取的数据对接收到的来自 根网络节点 300的上行光进行调制。
发送单元 3123 , 用于发送调制单元 3122调制后的上行光。
该叶网络节点 310还可以包括: 拓朴信息存储单元 314 , 用于存储自身所 在网络节点所在对称树的拓朴信息。
信令交互单元 31 3 , 用于根据拓朴信息存储单元 314存储的拓朴信息, 向 自身所在对称树的根网络节点 300发送数据传输请求。
叶网络节点 310要发送数据到汇聚网中的一个汇聚网络节点时, 才艮据拓朴 信息存储单元 314 中存储的拓朴信息, 查找以该汇聚网络节点为根网络节点 的对称树拓朴信息, 并根据该拓朴信息, 在该对称树中, 向根网络节点发送 数据传输请求。
其中, 叶网络节点 310 可以为半导体光放大器 (RSOA , Ref lect ive Semiconductor opt ica l Ampl if ier ), 该 RSOA可以有两种工作模式, 一种是 检测模式, 另一种是远端调制模式。 当信令交互单元 313接收包含自身所在 网络节点标识的允许应答后, 通知光处理单元 311 将工作模式切换为远端调 制模式, 根据允许应答中包含的特定波长信息, 将特定波长的下行光进行反 射, 发送单元 312 将要发送的数据调制在该特定波长的下行光进行反射后形 成的上行光上, 并将该调制后的上行光发送给根网络节点 300。
根网络节点 300可以包括: 激光器 301、 数据接收单元 302和光分插复用 器 303。
激光器 301 , 用于产生下行光。
光分插复用器 303 , 用于向以自身所在网络节点为根网络节点的对称树中 的叶网络节点广播激光器 301产生的下行光。
数据接收单元 302 , 用于接收叶网络节点 310发送的数据。
该根网络节点 300还可以包括: 信令交互单元 304 , 用于接收叶网络节点 310发送的数据传输请求, 釆用 DBA算法为发送数据传输请求的叶网络节点 310分配数据发送的时间,并向叶网络节点 310发送包含数据发送时间信息和 该叶网络节点 310标识的允许应答。
该根网络节点 300还包括: 波长调节单元 305 , 用于根据以自身所在网络 节点为根网络节点建立的对称树, 将激光器 301 广播的下行光调整为与该对 称树对应的特定波长的下行光。
每一个对称树可以对应一个特定波长, 这样, 各叶网络节点可以根据特定 波长区分是哪一个根网络节点发送的下行光, 以免发生冲突。
光分插复用器 303可以将该特定波长的下行光发送到叶网络节点的特定端 口, 信令交互单元 304 也可以将允许应答发送到叶网络节点的该特定端口, 这样, 叶网络节点从该特定端口接收到允许应答后, 便可以将从该特定端口 接收到的下行光进行反射。
上述的信令交互单元 304包括: 信令接收单元 3041、 DBA单元 3042、 应答 生成单元 3043和应答发送单元 3044。
信令接收单元 3041 , 用于接收叶网络节点 310发送的数据传输请求。
DBA单元 3042 , 用于在信令接收单元 3041接收到数据传输请求后, 釆用 DBA算法为发送数据传输请求的叶网络节点 310分配数据发送时间。
应答生成单元 3043 , 用于根据 DBA单元 3042分配的数据发送时间, 生成 包含数据发送时间信息和该叶网络节点标识的允许应答。
应答发送单元 3044 , 用于发送应答生成单元 3043生成的允许应答。
该根网络节点 300还可以包括: 拓朴信息存储单元 306 , 用于存储自身所 在网络节点所在对称树的拓朴信息。
波长调节单元 305 , 根据该拓朴信息存储单元 306存储的对称树的拓朴信 息, 将激光器 301产生的下行光调整为与该对称树对应的特定波长的下行光。
该光分插复用器 303 , 根据该拓朴信息存储单元 306存储的对称树的拓朴 信息在该对称树中广播下行光。
当然, 在汇聚网中, 有些网络节点可能同时作为一个对称树的根网络节点 和另一个对称树的叶网络节点, 所以, 可能同时包含上述根网络节点和叶网 络节点的结构, 该同时包含上述根网络节点和叶网络节点结构的网络节点也 在本发明保护的范围内。
由以上描述可以看出, 本发明实施例提供的方法、 系统和网络节点, 在以 一个汇聚网络节点为根网络节点所建立的对称树中, 叶网络节点将来自根网 络节点的下行光进行反射, 并利用反射后得到的上行光发送数据到根网络节 点。 这样, 只需在每个网络节点中设置一个激光器, 当网络节点需要发送数 据时, 利用接收端网络节点的激光器在以自身为根网络节点的对称树中发送 的下行光进行反射后得到的上行光, 发送数据到该接收端网络节点。 当网络 中有多个网络节点之间需要互相发送数据时, 无需在每个网络节点中为了形 成多条光路设置多个激光器, 大大节省了汇聚网中激光器的数目, 降低了汇 聚网全光化的成本。
例如, 当汇聚网中存在 4个网络节点时, 如图 4所示, 为了实现各网络节 点之间可以相互发送数据, 只需要在每个网络节点中设置一个激光器, 其它 3 个网络节点均可以利用该网络节点中的激光器发送的下行光进行反射后形成 的上行光来发送数据, 而不必在每个网络节点中设置 3 个激光器, 这样, 在 存在 4个网络节点的汇聚网中, 共需要设置 4个激光器, 这与现有技术中需 要设置 12个激光器的方法相比, 大大节约了激光器的个数, 降低了汇聚网全 光化的成本。
以上所述仅为本发明的较佳实施例而已, 并不用以限制本发明, 凡在本发 明的精神和原则之内, 所做的任何修改、 等同替换、 改进等, 均应包含在本 发明保护的范围之内。

Claims

权 利 要求 书
1、 一种发送数据的方法, 其特征在于, 该方法包括:
在以接收端网络节点为根网络节点所建立的对称树中, 叶网络节点将所述根 网络节点发送的下行光进行反射, 并利用反射后得到的上行光发送数据到所述 根网络节点。
2、 根据权利要求 1 所述的方法, 其特征在于, 该方法还包括: 利用最短路 径网桥算法建立以接收端网络节点为根网络节点的对称树。
3、 根据权利要求 1 所述的方法, 其特征在于, 叶网络节点将所述根网络节 点发送的下行光进行反射之前还包括:
叶网络节点向所述根网络节点发送数据传输请求, 接收所述根网络节点发送 的允许应答。
4、 根据权利要求 3 所述的方法, 其特征在于, 所述根网络节点发送允许应 答包括:
所述根网络节点接收到所述数据传输请求后, 釆用动态带宽分配算法为所述 发送数据传输请求的叶网络节点分配数据发送的时间, 并向所述叶网络节点发 送包含数据发送时间信息的允许应答;
所述发送数据到所述根网络节点包括: 根据所述允许应答中包含的数据发送 时间信息, 在所述分配的数据发送时间发送数据到所述根网络节点。
5、 根据权利要求 3 所述的方法, 其特征在于, 所述根网络节点发送的下行 光为特定波长的下行光; 节点接收到所述允许应答后, 根据所述允许应答中包含的特定波长的信息将所 述特定波长的下行光反射; 或者,
所述根网络节点将所述特定波长的下行光和允许应答发送到所述叶网络节 点的特定端口, 所述叶网络节点从所述特定端口接收到允许应答后, 将从所述 特定端口接收到的特定波长的下行光进行反射。
6、 根据权利要求 1 所述的方法, 其特征在于, 所述利用反射后得到的上行 光发送数据到所述根网络节点包括: 所述叶网络节点将要发送的数据调制在所 述反射后得到的上行光上, 并将该调制后的上行光发送给根网络节点。
7、 一种发送数据的系统, 其特征在于, 该系统包括: 在以接收端网络节点 为根网络节点所建立的对称树中的根网络节点 ( 300 )和叶网络节点 (310 ); 根网络节点 ( 300 ), 用于向所述叶网络节点 (310 )发送下行光, 接收所述 叶网络节点 (310 )发送的数据;
叶网络节点 (310 ), 用于将所述根网络节点 ( 300 )发送的下行光进行反射, 并利用反射后得到的上行光发送数据到所述根网络节点 ( 300 )。
8、 根据权利要求 7 所述的方法, 其特征在于, 所述叶网络节点 (310 ), 还 用于向所述根网络节点( 300 )发送数据传输请求,接收到所述根网络节点( 300 ) 发送的包含自身网络节点标识的允许应答后, 执行将所述根网络节点( 300 )发 送的下行光进行反射的操作;
所述根网络节点 ( 300 ), 还用于接收到所述叶网络节点 (310 )发送的数据 传输请求后, 向所述叶网络节点 ( 310 )发送包含所述叶网络节点标识的允许应 答。
9、 一种网络节点, 其特征在于, 该网络节点包括:
光处理单元(311 ), 用于将根网络节点发送的下行光进行反射, 或将接收到 的下行光转发给相邻的其它网络节点;
数据发送单元( 312 ), 用于利用所述光处理单元( 311 )反射后得到的上行 光发送数据到所述根网络节点。
10、 根据权利要求 9所述的网络节点, 其特征在于, 该网络节点还包括: 信 令交互单元(31 3 ), 用于发送数据传输请求, 以及接收到包含自身所在网络节 点标识的允许应答后, 通知所述光处理单元 ( 311 )执行所述将根网络节点发送 的下行光进行反射的操作; 接收到包含其它网络节点标识的允许应答或没有接 收到允许应答后, 通知所述光处理单元( 311 )执行所述将接收到的下行光转发 给相邻的其它网络节点的操作。
11、根据权利要求 9所述的网络节点,其特征在于,所述数据发送单元( 312 ) 包括:
数据获取单元(3121 ), 用于获取要发送的数据;
调制单元(3122 ), 用于利用所述数据获取单元(3121 )获取的数据对所述 上行光进行调制;
发送单元(3123 ), 用于发送所述调制单元(3122 )调制后的上行光。
12、 根据权利要求 10 所述的网络节点, 其特征在于, 该网络节点还包括: 拓朴信息存储单元(314 ), 用于存储自身所在网络节点所在对称树的拓朴信息; 所述信令交互单元 ( 31 3 ), 用于根据所述拓朴信息存储单元 ( 314 )存储的 拓朴信息, 向自身所在对称树的根网络节点发送数据传输请求。
1 3、 一种网络节点, 其特征在于, 该网络节点包括:
激光器(301 ), 用于产生下行光;
光分插复用器( 303 ), 用于向以自身所在网络节点为根网络节点的对称树中 的叶网络节点广播所述激光器 (301 )产生的下行光;
数据接收单元( 302 ), 用于接收所述叶网络节点发送的数据。
14、 根据权利要求 1 3 所述的网络节点, 其特征在于, 该网络节点还包括: 信令交互单元( 304 ), 用于接收所述叶网络节点发送的数据传输请求, 釆用动 态带宽分配算法为所述发送数据传输请求的叶网络节点分配数据发送的时间, 并向所述叶网络节点发送包含数据发送时间信息和该叶网络节点标识的允许应 答。
15、 根据权利要求 1 3 所述的网络节点, 其特征在于, 该网络节点还包括: 波长调节单元( 305 ), 用于根据以自身所在网络节点为根网络节点建立的对称 树, 将所述激光器(301 )产生的下行光调整为与该对称树对应的特定波长的下 行光。
16、 根据权利要求 1 3 所述的网络节点, 其特征在于, 所述信令交互单元包 括: 信令接收单元( 3041 ), 用于接收叶网络节点发送的数据传输请求;
DBA单元( 3042 ) ,用于在所述信令接收单元( 3041 )接收到数据传输请求后, 釆用 DBA算法为所述发送数据传输请求的叶网络节点分配数据发送时间;
应答生成单元( 3043 ), 用于根据所述 DBA单元( 3042 )分配的数据发送时 间, 生成包含数据发送时间信息和该叶网络节点标识的允许应答;
应答发送单元( 3044 ), 用于发送所述应答生成单元( 3043 )生成的允许应 答。
17、 根据权利要求 15 所述的网络节点, 其特征在于, 该网络节点还包括: 拓朴信息存储单元( 306 ), 用于存储自身所在网络节点所在对称树的拓朴信息; 所述波长调节单元( 305 ), 用于根据所述拓朴信息 ( 306 )存储单元存储的 对称树的拓朴信息, 执行所述将激光器(301 )产生的下行光调整为与该对称树 对应的特定波长的下行光的操作;
所述光分插复用器 ( 303 ), 用于根据所述拓朴信息存储单元( 306 )存储的 对称树的拓朴信息, 执行所述向自身所在网络节点为根网络节点的对称树中的 叶网络节点广播所述激光器(301 )产生的下行光的操作。
PCT/CN2008/072529 2007-10-11 2008-09-25 Procédé, système et nœud de réseau pour transmettre des données WO2009049522A1 (fr)

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CN1593027A (zh) * 2001-09-28 2005-03-09 英特尔公司 光网络中传送上行数据的方法和装置
US20050237974A1 (en) * 2004-04-21 2005-10-27 Alcatel Tree optical transmission network
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CN1593027A (zh) * 2001-09-28 2005-03-09 英特尔公司 光网络中传送上行数据的方法和装置
US20050237974A1 (en) * 2004-04-21 2005-10-27 Alcatel Tree optical transmission network
US20070116467A1 (en) * 2005-11-23 2007-05-24 Samsung Electronics Co.; Ltd Passive optical network

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