公开(公告)号：US09490927B2

公开(公告)日：2016-11-08

申请号：US14382299

申请日：2012-03-22

申请人： Filippo Cugini ,  Giulio Bottari ,  Gianmarco Bruno ,  Piero Castoldi ,  Paola Iovanna ,  Nicola Sambo

发明人： Filippo Cugini ,  Giulio Bottari ,  Gianmarco Bruno ,  Piero Castoldi ,  Paola Iovanna ,  Nicola Sambo

IPC分类号： H04J14/02

CPC分类号： H04J14/0227 ,  H04J14/02 ,  H04J14/0224 ,  H04J14/0254 ,  H04J14/0257 ,  H04J14/026 ,  H04J14/0267

摘要： A method of changing the spectral position of a lightpath between a source node and a destination node of an optical network. The optical network uses a flexible grid for spectral allocation and the lightpath has been allocated first spectral resources at a first spectral position. The method comprises, at the source node, reserving additional spectral resources for the lightpath which are contiguous in frequency with the first spectral resources. The method comprises re-tuning a light source at the source node such that the lightpath moves in frequency from using the first spectral resources at the first spectral position to using second spectral resources at a second spectral position, wherein the second spectral resources comprise at least some of the additional spectral resources. The method comprises releasing at least some of the first spectral resources. The source node continues to send traffic over the lightpath during the re-tuning.

摘要翻译： 一种在光网络的源节点和目的地节点之间改变光路的光谱位置的方法。 光网络使用灵活的网格进行光谱分配，并且光路已经在第一光谱位置分配了第一光谱资源。 该方法包括在源节点处为与第一光谱资源频率相邻的光路预留附加光谱资源。 该方法包括在源节点处重新调谐光源，使得光路在频率上从使用第一光谱位置处的第一光谱资源移动到在第二光谱位置处使用第二光谱资源，其中第二光谱资源至少包括 一些额外的频谱资源。 该方法包括释放至少一些第一光谱资源。 在重新调谐期间，源节点继续在光路上发送流量。

公开(公告)号：US20150244453A1

公开(公告)日：2015-08-27

申请号：US14344973

申请日：2011-10-12

申请人： Giulio Bottari ,  Diego Caviglia ,  Daniele Ceccarelli

发明人： Giulio Bottari ,  Diego Caviglia ,  Daniele Ceccarelli

IPC分类号： H04B10/032 ,  H04Q11/00 ,  H04J14/02 ,  H04B10/2575

CPC分类号： H04B10/032 ,  H04B10/2575 ,  H04J14/00 ,  H04J14/0209 ,  H04J14/0212 ,  H04J14/0217 ,  H04J14/0257 ,  H04J14/0267 ,  H04J14/0268 ,  H04J14/0271 ,  H04J14/0284 ,  H04Q11/0005 ,  H04Q2011/0043

摘要： Dynamic restoration involves routing and bandwidth assignment of an unplanned restoration path in a wavelength switched optical network (20), having regeneration nodes (60), nodes each having a ROADM (62) having drop paths and add paths. An electrical switch (68) provides configurable regeneration capacity by coupling selected drop paths to selected add paths. Some of the configurable regeneration capacity is kept for unplanned restoration paths. A PCE determines (120) routing and bandwidth assignments for an unplanned restoration path for the traffic flow to avoid a fault, and sends (130) configuration messages to the nodes to set up the unplanned restoration path dynamically and to configure the electrical switch to provide regeneration on the path. Keeping some reconfigurable regeneration capacity enables much longer unplanned paths to be found to avoid faults, and enables wavelength conversion if needed. Thus the reliability of finding at least one path avoiding the fault can be increased.

摘要翻译： 动态恢复涉及在具有再生节点（60）的波长交换光网络（20）中的非计划恢复路径的路由和带宽分配，每个节点具有具有丢弃路径和添加路径的ROADM（62）。 电开关（68）通过将所选择的放置路径耦合到所选择的附加路径来提供可配置的再生能力。 一些可配置的再生能力被保留用于非计划的恢复路径。 PCE确定（120）用于业务流的非计划恢复路径的路由和带宽分配以避免故障，并且向节点发送（130）配置消息以动态地建立非计划恢复路径并且配置电开关以提供 在路上再生。 保持一些可重新配置的再生能力可以实现更长的非计划路径，以避免故障，并在需要时实现波长转换。 因此，可以增加找到至少一个避免故障的路径的可靠性。

公开(公告)号：US20150104167A1

公开(公告)日：2015-04-16

申请号：US14401106

申请日：2012-06-19

申请人： Giulio Bottari ,  Stefano Ruffini

发明人： Giulio Bottari ,  Stefano Ruffini

IPC分类号： H04B10/077

CPC分类号： H04B10/0775 ,  H04B10/2513 ,  H04J3/0661 ,  H04J3/0697

摘要： A method of determining properties of an optical communications path between a first optical network node (A) and a second optical network node (B) determines, at the second optical network node (B), a time difference between respective first and second optical test signals received on different wavelengths (λ1, λ2) from the first optical network node. The method also determines, at the second optical network node (B), a real-time chromatic dispersion parameter for each of the wavelengths using a respective coherent receiver at the second optical network node. The method can be used to determine length of the path between the nodes (A, B). The method can be used to determine propagation delay between the nodes (A, B), or asymmetry in propagation delay between the nodes (A, B). Where separate paths are used for forward and reverse transmission directions, measurements can be made of each path.

摘要翻译： 确定第一光网络节点（A）和第二光网络节点（B）之间的光通信路径的属性的方法在第二光网络节点（B）处确定相应的第一和第二光学测试 从第一光网络节点接收的不同波长（λ1，λ2）的信号。 该方法还在第二光网络节点（B）处确定在第二光网络节点处使用相应的相干接收机的每个波长的实时色散参数。 该方法可用于确定节点（A，B）之间路径的长度。 该方法可用于确定节点（A，B）之间的传播延迟，或节点（A，B）之间传播延迟的不对称性。 在使用独立路径用于正向和反向传输方向的情况下，可以对每条路径进行测量。

公开(公告)号：US20130202291A1

公开(公告)日：2013-08-08

申请号：US13879147

申请日：2011-09-13

申请人： Fabio Cavaliere ,  Giulio Bottari ,  Luca Giorgi ,  Stefano Ruffini

发明人： Fabio Cavaliere ,  Giulio Bottari ,  Luca Giorgi ,  Stefano Ruffini

IPC分类号： H04B10/08

CPC分类号： H04L43/0864 ,  H04B10/07 ,  H04B10/0775 ,  H04B10/0795 ,  H04B2210/072 ,  H04B2210/078 ,  H04J3/0667 ,  H04J14/0201 ,  H04J14/021 ,  H04J14/0226 ,  H04J14/0267 ,  H04J14/0273 ,  H04J14/0275 ,  H04Q11/0066 ,  H04Q2011/0083

摘要： A method for measuring asymmetry in propagation delay of first and second links which connect a first node to a second node of a communication network. The method comprises measuring (101) a round trip delay of the first link. The round trip delay can be measured by transmitting (102) a test signal from the first node to the second node over the first link and receiving a reply to the test signal from the second node over the first link. The method further comprises measuring (105) a round trip delay of the second link. The round trip delay can be measured by transmitting (106) a test signal to the second node over the second link and receiving a reply to the test signal from the second node over the second link. A difference in the propagation delay of the first link with respect to the second link is determined (109) using the measured round trip delays of the first link and the second link.

摘要翻译： 一种用于测量将第一节点连接到通信网络的第二节点的第一和第二链路的传播延迟不对称的方法。 该方法包括测量（101）第一链路的往返延迟。 可以通过在第一链路上将测试信号从第一节点发送（102）到第二节点（102）并通过第一链路接收来自第二节点的测试信号的答复来测量往返延迟。 该方法还包括测量（105）第二链路的往返延迟。 可以通过在第二链路上向第二节点发送（106）测试信号（106）并通过第二链路从第二节点接收对测试信号的回复来测量往返延迟。 使用所测量的第一链路和第二链路的往返延迟来确定第一链路相对于第二链路的传播延迟的差异（109）。

公开(公告)号：US20120148234A1

公开(公告)日：2012-06-14

申请号：US13391428

申请日：2010-07-30

申请人： Elisa Bellagamba ,  Enrico Dutti ,  Giulio Bottari

发明人： Elisa Bellagamba ,  Enrico Dutti ,  Giulio Bottari

IPC分类号： H04J14/02 ,  H04B10/08

CPC分类号： H04J14/0227 ,  H04J14/0221 ,  H04J14/0257 ,  H04J14/0258 ,  H04J14/0267 ,  H04J14/0269 ,  H04J14/0271 ,  H04J14/0284 ,  H04Q2011/0073 ,  H04Q2011/0086

摘要： The present invention relates to methods and node entities for distributing Physical (PI) parameters used when establishing Optical Paths for user traffic by routing and wavelength assignment of optical channels carried in optical links of a Wavelength Switched Optical Network (WSON).

摘要翻译： 本发明涉及用于在通过波长切换光网络（WSON）的光链路中承载的光信道的路由和波长分配来建立用于用户业务的光路径时使用的物理（PI）参数的方法和节点实体。

公开(公告)号：US20110004455A1

公开(公告)日：2011-01-06

申请号：US12678278

申请日：2008-09-24

申请人： Diego Caviglia ,  Giulio Bottari

发明人： Diego Caviglia ,  Giulio Bottari

IPC分类号： G06F17/50

CPC分类号： H04L41/145 ,  H04L41/12

摘要： A method of designing a network given a set of network nodes, a set of adjacencies defining which nodes can be connected together directly and so are topologically adjacent and a traffic matrix comprising a plurality of entries each indicating a source node, a destination node and a number being the number of connections from the source node to the destination node that are to be present in the network; the method comprising the steps of: simulating the network nodes and the adjacencies thereof to generate a simulated network; simulating applying the traffic matrix entry by entry, each application of an entry causing a number of links consistent with the entry to be simulated between the source and destination nodes indicated in the entry, via a chain of topologically adjacent nodes; simulating the effect of at least one failure on the simulated network, including simulating the re-routing of the links onto a replacement chain where the chain is broken; determining the number of links between each pair of topologically adjacent nodes; repeating these steps for a plurality of iterations, the order in which the entries in the traffic matrix and the faults are applied being different in different iterations; for each iteration and for each topologically adjacent pair of nodes, determining an average number of links between the pair of nodes for all iterations so far; for each iteration and for each pair of topologically adjacent pair of nodes, determining a variance in the average number of links for all iterations so far; for each iteration, determining an average variance in the average number of links for all iterations so far, the average being taken across the entire network; for each iteration, determining a variance in the variances in the average number of links for all iterations so far, the variance being taken across the entire network; determining when to cease iterating based upon the variance in the variances in the average number of links.

公开(公告)号：US09473834B2

公开(公告)日：2016-10-18

申请号：US14417550

申请日：2012-08-16

申请人： Nicola Sambo ,  Giulio Bottari ,  Piero Castoldi ,  Filippo Cugini ,  Paola Iovanna

发明人： Nicola Sambo ,  Giulio Bottari ,  Piero Castoldi ,  Filippo Cugini ,  Paola Iovanna

IPC分类号： H04J14/02 ,  H04Q11/00 ,  H04L12/721 ,  H04L27/26

CPC分类号： H04Q11/0062 ,  H04J14/0212 ,  H04J14/0257 ,  H04J14/0261 ,  H04J14/0267 ,  H04J14/0298 ,  H04L27/2697 ,  H04L45/62 ,  H04Q2011/0086 ,  H04Q2011/0088

摘要： In an optical communications network using bandwidth variable wavelength switching, routing and spectrum assignment for a traffic request for x sub-carriers of a super-channel, involves checking for an existing super-channel having sufficient potential sub-carriers not currently active. If not found, then possible paths for a new super-channel are identified and a path is selected and sub-carriers assigned. By trying first to use inactive potential sub-carriers of an existing super-channel, fewer super channels overall are needed, and thus fewer super transponders are needed. This can reduce blocking probabilities and can reduce capital costs. The search for possible paths can try to avoid or reduce overlap with spectrum of existing super channels, or compare possible paths by weighting according to amounts of overlap.

摘要翻译： 在使用带宽可变波长切换的光通信网络中，对于超级信道的x个子载波的业务请求的路由和频谱分配涉及检查具有当前没有活动的足够的潜在子载波的现有超级信道。 如果没有找到，则识别新的超级信道的可能路径，并且选择路径并分配子载波。 首先尝试使用现有超级频道的无效潜在子载波，需要更少的超级频道，因此需要更少的超级应答器。 这可以减少阻塞概率，并可以降低资本成本。 搜索可能的路径可以尝试避免或减少与现有超级频道的频谱重叠，或者通过根据重叠量加权来比较可能的路径。

公开(公告)号：US09288111B2

公开(公告)日：2016-03-15

申请号：US13579804

申请日：2010-02-23

申请人： Paola Iovanna ,  Giulio Bottari

发明人： Paola Iovanna ,  Giulio Bottari

IPC分类号： G06F15/173 ,  G06F15/16 ,  H04L12/28 ,  H04L12/24 ,  H04L12/751 ,  H04L12/715

CPC分类号： H04L41/12 ,  H04L41/022 ,  H04L45/02 ,  H04L45/04

摘要： A multi-domain network comprises domains of different network technology types. A network domain comprises a plurality of network nodes connected by links and comprising border nodes which connect with other network domains. In a first domain (AS A) of a first technology type, a method comprises determining an intra-domain topology of the nodes and links of the domain by collecting values of at least one network topology parameter of the first technology type. The method determines a summarized intra-domain topology of paths between border nodes of the domain which is described using values of at least one summarized network topology parameter. Values of the summarized network topology parameter are derived from the values of the network topology parameter of the intra-domain topology of the first technology type. The summarized network topology parameter is part of a common set of network topology parameters for advertising between domains comprising apparatus of different technology types. A domain can comprise multiple layers of different technology type.

摘要翻译： 多域网络包括不同网络技术类型的域。 网络域包括通过链路连接并包括与其他网络域连接的边界节点的多个网络节点。 在第一技术类型的第一域（AS A）中，一种方法包括通过收集第一技术类型的至少一个网络拓扑参数的值来确定该节点的节点和链路的域内拓扑。 该方法确定使用至少一个汇总的网络拓扑参数的值来描述的域的边界节点之间的路径的汇总的域内拓扑。 汇总网络拓扑参数的值从第一种技术类型的域内拓扑的网络拓扑参数的值导出。 总结网络拓扑参数是用于在包括不同技术类型的设备的域之间进行广告的一组通用网络拓扑参数的一部分。 域可以包括不同技术类型的多层。

公开(公告)号：US20150163125A1

公开(公告)日：2015-06-11

申请号：US14386151

申请日：2012-04-05

申请人： Diego Caviglia ,  Giulio Bottari ,  Daniele Ceccarelli

发明人： Diego Caviglia ,  Giulio Bottari ,  Daniele Ceccarelli

IPC分类号： H04L12/751 ,  H04L12/721 ,  H04L12/723

CPC分类号： H04L45/02 ,  H04L41/12 ,  H04L45/04 ,  H04L45/26 ,  H04L45/42 ,  H04L45/44 ,  H04L45/50

摘要： A network architecture is provided for enabling end-to-end paths to be computed across a plurality of network domains. The network architecture comprises a plurality of child path computation elements associated with a plurality of respective network domains, each child path computation element adapted to compute a path segment within its respective network domain. A parent path computation element adapted to compute an end-to-end path across a plurality of network domains in conjunction with the plurality of respective child path computation elements.

摘要翻译： 提供了一种网络架构，用于跨多个网络域计算端到端路径。 网络架构包括与多个相应网络域相关联的多个子路径计算元件，每个子路径计算元件适于计算其各自网络域内的路径段。 父路径计算元件，适于结合多个相应的子路径计算元件计算跨多个网络域的端到端路径。

公开(公告)号：US20140341572A1

公开(公告)日：2014-11-20

申请号：US14240232

申请日：2011-09-30

申请人： Nicola Sambo ,  Giulio Bottari ,  Piero Castoldi ,  Filippo Cugini ,  Paola Iovanna

发明人： Nicola Sambo ,  Giulio Bottari ,  Piero Castoldi ,  Filippo Cugini ,  Paola Iovanna

IPC分类号： H04Q11/00 ,  H04J14/02

CPC分类号： H04Q11/0062 ,  H04J14/0224 ,  H04J14/0227 ,  H04J14/0257 ,  H04J14/026 ,  H04J14/0267 ,  H04J14/0269 ,  H04J14/0271 ,  H04Q2011/0086

摘要： Routing and bandwidth assignment of new paths of different bandwidths, occupying different numbers of adjacent frequency slots in a wavelength switched optical network, involves selecting a route, and assigning a set of adjacent frequency slots. The assignment can place wider bandwidth ones of the new paths at an opposite end of a spectrum of the available frequency slots, to an end where narrower bandwidth ones are placed. A size of sets of available adjacent slots remaining after the assignment is likely to be increased, compared to a conventional first fit assignment. A wider subsequent new path can sometimes be accommodated along all or some of the route and thus the blocking probability can be lowered. The selecting of which of the possible routes to use can be made dependent on which has more sets of available adjacent frequency slots, or which has a wider gap between occupied slots.

摘要翻译： 在波长交换光网络中占用不同数量的相邻频率槽的不同带宽的新路径的路由和带宽分配涉及选择路由和分配一组相邻频率时隙。 该分配可以将更宽的带宽的新路径放置在可用频率隙的频谱的另一端，到达放置较窄带宽的端点。 与传统的第一拟合分配相比，分配之后剩余的可用相邻狭缝的集合的大小可能增加。 有时可以沿着所有或某些路线容纳更宽的后续新路径，从而可以降低阻塞概率。 可以选择要使用哪些可能的路由取决于哪些具有更多的可用相邻频率槽的集合，或者在占用时隙之间具有更宽的间隙。