WO2014079866A1 - Système et procédé permettant une optimisation de la protection et/ou restauration optique sur un réseau optique au moyen de transpondeurs multiformat à traitement numérique du signal et d'un module gestionnaire de traitement numérique du signal - Google Patents

Système et procédé permettant une optimisation de la protection et/ou restauration optique sur un réseau optique au moyen de transpondeurs multiformat à traitement numérique du signal et d'un module gestionnaire de traitement numérique du signal Download PDF

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Publication number
WO2014079866A1
WO2014079866A1 PCT/EP2013/074260 EP2013074260W WO2014079866A1 WO 2014079866 A1 WO2014079866 A1 WO 2014079866A1 EP 2013074260 W EP2013074260 W EP 2013074260W WO 2014079866 A1 WO2014079866 A1 WO 2014079866A1
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WIPO (PCT)
Prior art keywords
dsp
format
module
traffic
optical
Prior art date
Application number
PCT/EP2013/074260
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English (en)
Inventor
Óscar GONZÁLEZ DE DIOS
Felipe JIMÉNEZ ARRIBAS
José Manuel RIVAS MOSCOSO
Alfredo GONZÁLEZ MUÑIZ
Original Assignee
Telefonica, S.A.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
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Application filed by Telefonica, S.A. filed Critical Telefonica, S.A.
Publication of WO2014079866A1 publication Critical patent/WO2014079866A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
    • H04J14/0254—Optical medium access
    • H04J14/0256—Optical medium access at the optical channel layer
    • H04J14/0257—Wavelength assignment algorithms
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
    • H04J14/0254—Optical medium access
    • H04J14/0267—Optical signaling or routing
    • H04J14/0268—Restoration of optical paths, e.g. p-cycles
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
    • H04J14/0254—Optical medium access
    • H04J14/0267—Optical signaling or routing
    • H04J14/0269—Optical signaling or routing using tables for routing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
    • H04J14/0254—Optical medium access
    • H04J14/0267—Optical signaling or routing
    • H04J14/0271—Impairment aware routing

Definitions

  • optical networks are equipped with a limited set of transponders, with different transmission speeds and tolerances to physical impairments on the fibre.
  • Data network nodes are connected by means of logical point-to-point links (wavelengths) between transponders, which belong to a model or set of models with enough capacity to carry all traffic between the data nodes and suitable for the optical path conditions, such as received optical signal to noise ratio, filter concatenation, etc.
  • transponders Some of the logical paths between nodes must be protected in a complete (transponder and line side) or partial (line) model, in order to avoid traffic interruption for critical services. Protection procedures can also be complemented with restoration for even higher resiliency. In those scenarios transponders are duplicated in the end nodes, and parallel logical connections (wavelengths) are created between them. For less critical services, restoration mechanisms allow an on-the-fly circuit setup after a failure event on the single active circuit, avoiding the duplication of deployed transponders.
  • Protection, restoration or a combination of both are widely used in the optical networks, as either critical services or very high volumes of traffic are supported over them.
  • Network planners have to take into account that several routes must be feasible (to allow, at least, for restoration) for every optical link between every specific pair of transponders.
  • a subset of all possible optical routes will be feasible and can be considered for communications between one type of transponders whereas a different subset will be feasible for a different type of transponders.
  • a communication example between data nodes connected to different types (A, B) of transponders is shown in Figure 1 , where nominal and protected routes between two different transponder types are shown.
  • Variable bit-rate transponders would have a set of transmission requirements depending on their current bit rate. This could lead to optical network optimization in terms of deployed resources (e.g. regenerators), network capacity, feasible routes for protection and restoration, power consumption, etc.
  • deployed resources e.g. regenerators
  • This invention proposes methods and systems aimed at augmenting transport network capacity in terms of overall carried traffic as well as easing optical planning tasks for protected and restorable services.
  • the present invention relates, in a first aspect, to a method for optical protection and/or restoration optimization on an optical network with DSP-based multi- format transponders, comprising as commonly in the field:
  • an optical network equipped with at least two DSP-based multi-format transponders, for carrying data traffic through at least two optical routes, and
  • PCE+ extended path computation element
  • RWA wavelength assignment
  • the method of the first aspect comprises using a digital signal processor (DSP) manager module, establishing an optimal route of said at least two optical routes calculating route parameters by checking a peak traffic of said at least two DSP-based multi-format transponders.
  • DSP digital signal processor
  • said PCE+ module receives as an input said list of suitable signal and frame formats from said DSP manager module and further uses this information for the establishment of an optimal route of said at least two optical routes.
  • the optical node controller module interacts with said DSP-based multi-format transponders and receives a plurality of requests from a management system module to set up a plurality of new services. Said optical node controller module then forwards the requests to said DSP manager module.
  • said calculated route parameters and said signal and frame formats are stored in a traffic database module.
  • a second aspect of the present invention relates to a system for optical protection and/or restoration optimization on an optical network with DSP-based multi-format transponders, comprising:
  • optical network equipped with at least two DSP-based multi-format transponders for carrying data traffic through at least two optical routes
  • a PCE+ module adapted to perform a routing and a wavelength assignment (RWA) for said data traffic.
  • the system further comprises:
  • a traffic database module to store said calculated route parameters and said signal and frame formats.
  • the system of the second aspect is adapted to implement the method of the first aspect.
  • a core planner sub-module adapted to perform said resource usage optimization and said transport network capacity allocation automation and to communicate with a PCE+ module;
  • Figure 1 is an example of a nominal and protected route between two different transponder types.
  • Figure 2 is an illustration of the interaction between a DSP manager, a transponder and a PCE+, according to an embodiment.
  • Figure 5 is a backup-route set-up process flow chart for protected services, according to an embodiment.
  • Figure 6 is a backup-route set-up process flow chart for restorable services with path precomputation, according to an embodiment.
  • Figure 9 is a flow chart in the case of route failure, according to an embodiment.
  • Figure 10 is a flow chart showing the overall process of the present invention.
  • the tool will select the best route based on its own criteria and the options received from the DSP manager (10).
  • the route parameters will subsequently be stored, together with the signal and frame format, in a traffic database module (60).
  • the PCE+ (50) informs the DSP manager (10) of the signal parameters that need to be used on that route.
  • the DSP manager (10) then dispatches the appropriate instructions to the management sub module (402) in the optical node controller (40), which eventually configures the DSP (301 ).
  • Figure 2 illustrates the DSP manager, the transponder and the PCE+ interaction.
  • a format advisor sub-module (103) that queries a look-up table (25) and make a list of suitable signal and frame formats for given traffic capacities under a set of impairment assumptions.
  • the look-up table (25) is periodically updated by the traffic measurement module (20) on the peak traffic of every DSP-based multi- format transponder (30) and also stores operator-entered parameters related to forecast traffic increments.
  • the format advisor (103) then sends the list of suitable signal and frame formats to the core planner (102), which makes the decision of whether a new path must be computed, in which case it will send the PCE+ (50) all the necessary information for the RWA process.
  • the format advisor sub-module (103) will continuously update the core planner (102) on the suitability list.
  • a controller sub-module (101 ) which receives an indication from the core planner (102) when a format change is needed for the current route (if it complies with any of the options from the suitability list) or for a new established route, gets access to the involved transponder DSP (301 ) and configures it accordingly.
  • any kind of connectivity service it is a common operator practice for any kind of connectivity service to define a nominal route for the optical light path under normal operating conditions. This route will be maintained, at least for an extended period of time, after some failure event triggers a switch to an already established backup path (protected services) or to a newly created path (restorable services). After the event, the optical system will keep trying to get back to the nominal route.
  • the nominal route can also be optimized according to new planning criteria or modified to accommodate higher capacity demands, but this process will not be carried out frequently, e.g. on a yearly basis.
  • DSP-based multi-format transponders (30) will offer flexibility in terms of overhead ratio for error correction as well as modulation format. Changes in signal baud-rate will not be considered as they will also imply a modification in the electrical circuitry preceding the transponder element.
  • New service creation In the case of a new service creation, the system management (70) receives a new service request and dispatches it to the optical node controller's management sub module (402), which in turn passes it on to the DSP manager module (10).
  • the sequence of steps that follows details the processes that take place within the DSP manager (10) and how it interacts with its surrounding elements:
  • the controller (101 ) receives a new service-creation request between DSP- based multi-format transponders (30) of some specific type (provider, model) with maximum capacity C, and sends it to the core planner (102). Traffic estimations show a forecast need at time T1 of C, and a current (peak) capacity need of C " , with C " ⁇ C ' ⁇ C.
  • the PCE+ (50) uses its topology database, the suitability list provided by the core planner (102) and the available information from the outside/inside plant: fibre link attenuations, amplifier location and characteristics (noise factor), reconfigurable add-and-drop multiplexer (ROADM) location and filter profile, etc. Therewith, the PCE+ (50) selects the optimal route according to some predefined criteria and sends this information to a traffic database (60), where modulation format, overhead and route parameters are stored for later access from the PCE+ (50) or the core planner (102).
  • a traffic database 60
  • modulation format, overhead and route parameters are stored for later access from the PCE+ (50) or the core planner (102).
  • Figure 3 and Figure 4 show the flow chart and a message-flow example, respectively, for this nominal-route turn-up process.
  • the core planner (102) queries the static database (suitability list) in the format advisor sub module (103) for the register corresponding to capacity C " (current peak traffic), instead of C, from the look-up table (25), and then it follows the same process as above.
  • the core planner (102) queries the format advisor sub module (103) for the register for C " from the look-up table (25). This information is sent to the PCE+ (50) so that it can calculate a backup route that will be stored in the traffic database (60), to be used in a potential restoration process.
  • the PCE+ 50
  • Figure 6 shows the backup-route set-up process flow chart for restorable services with path precomputation.
  • the format advisor sub-module (103) computes a suitability list with possible options (modulation-format/overhead pair) to carry the current peak traffic, plus some excess A ' . This excess is introduced as a safety mechanism that ensures the options will be valid for at least At, when a new traffic reading is performed.
  • This suitability list is sent to the core planner (102) in the DSP manager (10), along with the associated maximum impairment values for each modulation format and overhead ratio.
  • the core planner (102) informs the controller sub-module (101 ) that a new format must be used.
  • the controller (101 ) gets access to the management sub module (402) in the optical node controller (40) and configures the transponder DSP (301 ) in accordance.
  • the optical path is unsuitable for all possible signal formats.
  • the PCE+ (50) computes a new optical path for the protection route and sends the corresponding commands to the traffic database (60) and the optical node controller (40) for path establishment. If the current signal format is maintained, no further actions are required. If the format has to be changed, the core planner (102) will indicate to the controller sub-module (102) that it must reconfigure the transponders (30) involved. To do so, the controller will get access to the management sub module (402) in the optical node controller (40).
  • Figure 8 is a nominal and backup route turn-up process message-flow example for protected services.
  • the controller (101 ) in the DSP manager (10) receives a failure message and dispatches a new service request to the core planner (102), which queries the format advisor sub-module (103) for updated values of the peak rate C " and the increments ⁇ and ⁇ ' retrieved from the look-up table (25).
  • the core planner (102) evaluates whether the peak traffic is still below C, and, if this condition holds (as would normally happen), the format advisor (103) calculates a suitability list of modulation formats and OH ratios for C " + ⁇ ' .
  • the core planner (102) passes a suitability list of modulation formats, FEC overheads (OH) and the impairments associated with them on to the PCE+ (50).
  • the PCE+ (50) selects the optimal route according to some predefined criteria and sends this information to the core planner (102) and to a traffic database (60), where modulation format, overhead and route parameters are stored for later access from the PCE+ (50) or the core planner (102).
  • the DSP manager (10) will follow the same steps described for the establishment of the nominal route upon reception of a new service creation request.
  • the core planner (102) needs to access state information of the established connections in the network. Also, the PCE+ (50) needs to store and access state information. These interfaces can be implemented by means of any database protocol.
  • the message that needs to be sent from the format advisor (103) to the core planner (102) is:
  • Connection ID (unique identifier of the connection in the network), List of Modulation Formats, Overheads and Channel Impairments.
  • the core planner (102) need to request the list of modulation formats and overhead for a capacity C from the format advisor (103). Under no other circumstance does the core planner (102) proactively send requests to the format advisor (103).
  • the message that could be sent from the core planner (102) to the format advisor (103) is:
  • Connection ID (unique identifier of the connection in the network), Capacity.
  • the Traffic measurement module (20) updates the look-up table (25) contents for each connection.
  • the format advisor (103) consults the look-up table (25)
  • the following message is received as a reply: - TRAFFIC_USED_PER_CONNECTION message: Connection ID (unique identifier of the connection in the network), Current Capacity used (measured)
  • the traffic measurement module (20) periodically queries the optical node controller management sub module (402) to ascertain the traffic transmitted during the last measurement interval.
  • This interface can be implemented with standard protocols like SNMP or Netconf.
  • the look-up table (25) is then updated by the traffic measurement module (20)
  • the DSP manager (10) may decide that the modulation format used by the transponder (either for the nominal or backup paths) needs to be changed.
  • the message sent from the core planner (102) to the DSP manager controller (101 ) must contain the following information:
  • the messages sent from the DSP manager controller (101 ) are:
  • Optical Node Controller (40): When the DSP manager (10) decides that a transponder's modulation format needs to be changed, the DSP manager controller (101 ) is notified. The DSP manager controller (101 ) will have one interface per transponder (physically, it can be multiplexed in a single data connection, e.g. to an Ethernet network, not excluding others). The message sent from the DSP manager controller (101 ) to the optical node controller (40) must contain the following information:
  • the messages sent from the Optical Controller are:
  • This interface can be implemented by any standard protocol to configure devices or nodes (e.g. SNMP, Netconf, Openflow).
  • the proposed invention allows increased flexibility of RWA, especially for the protection and restoration paths, which can be periodically updated without any impact on service performance.
  • This extended flexibility comes from the existence of a higher number of potential routes, as their feasibility has to be ensured only for the actual traffic instead of the maximum traffic forecast. As a result, either network reliability augments or equipment expenditures can be decreased.
  • network operation is simplified thanks to the automatic reconfiguration of the optical transponders according to the specific needs (traffic, network conditions, etc.) and onsite maintenance tasks can be kept to a minimum.
  • the proposal is focused on currently deployed fixed grid optical networks, where a light path fits into a fixed frequency slot of the transmission system (typically 50 GHz). Although there are no deployments of variable grid networks yet, they are expected to be available in the near future. The described approach could be easily extended to take leverage on those new capabilities to also optimize the use of available spectrum.

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

Abstract

L'invention porte sur un procédé et un système qui permettent d'optimiser la protection et/ou restauration optique sur un réseau optique au moyen de transpondeurs multiformat à traitement numérique du signal. Le procédé selon l'invention fait appel à un réseau optique équipé d'au moins deux transpondeurs multiformat à traitement numérique du signal (30) qui transportent un trafic de données sur au moins deux routes optiques, et à un module PCE+ (50) qui effectue un routage et une attribution de longueur d'onde (RWA). Le procédé permet, par le biais d'un module gestionnaire de traitement numérique du signal (DSP) (10) qui calcule des paramètres de routage en contrôlant le trafic de pointe desdits au moins deux transpondeurs multiformat à traitement numérique du signal (30), d'établir une route optimale parmi lesdites au moins deux routes optiques. Le système selon l'invention est apte à permettre la mise en œuvre du procédé précité. Le module gestionnaire de traitement numérique du signal (10) peut être utilisé pour optimiser l'utilisation des ressources et pour automatiser l'attribution d'une capacité du réseau de transport.
PCT/EP2013/074260 2012-11-21 2013-11-20 Système et procédé permettant une optimisation de la protection et/ou restauration optique sur un réseau optique au moyen de transpondeurs multiformat à traitement numérique du signal et d'un module gestionnaire de traitement numérique du signal WO2014079866A1 (fr)

Applications Claiming Priority (2)

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ES201231802 2012-11-21
ESP201231802 2012-11-21

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WO2014079866A1 true WO2014079866A1 (fr) 2014-05-30

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112187398A (zh) * 2020-09-30 2021-01-05 国网山东省电力公司信息通信公司 电力otn光传输系统地调双上联光路优化方法及系统

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FILIPPO CUGINI ET AL: "Demonstration of Flexible Optical Network Based on Path Computation Element", JOURNAL OF LIGHTWAVE TECHNOLOGY, IEEE SERVICE CENTER, NEW YORK, NY, US, vol. 30, no. 5, 1 March 2012 (2012-03-01), pages 727 - 733, XP011405627, ISSN: 0733-8724, DOI: 10.1109/JLT.2011.2180361 *
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112187398A (zh) * 2020-09-30 2021-01-05 国网山东省电力公司信息通信公司 电力otn光传输系统地调双上联光路优化方法及系统
CN112187398B (zh) * 2020-09-30 2022-09-20 国网山东省电力公司信息通信公司 电力otn光传输系统地调双上联光路优化方法及系统

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