Patent application number | Description | Published |
20120163390 | METHOD AND APPARATUS FOR PATH COMPUTATION ELEMENT AND ROUTING CONTROLLER COOPERATION - A system, method, and node for a Routing Controller (RC) to obtain from a Path Computation Element (PCE), network resource path metrics across a plurality of domains in a communication network in which each domain includes a plurality of Border Nodes (BNs). The RC sends to the PCE, a first message requesting a first path computation between each pair of BNs. The first message contains a maximum metric-value that a path computation must not exceed for a Path Computation Client (PCC) to consider the path computation acceptable. The RC then sends a second message requesting the PCE to compute a subsequent path computation for each BN pair for which the first path computation did not exceed the maximum metric-value. The second message contains a minimum metric-value that a path metric must exceed for the PCC to consider the path metric acceptable. The RC then receives the computed subsequent path computation. | 06-28-2012 |
20130070638 | Summarisation in a Multi-Domain Network - 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 summarised intra-domain topology of paths between border nodes of the domain which is described using values of at least one summarised network topology parameter. Values of the summarised network topology parameter are derived from the values of the network topology parameter of the intra-domain topology of the first technology type. The summarised 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. | 03-21-2013 |
20130070754 | REDUCING NETWORK POWER CONSUMPTION - Path computation involves determining ( | 03-21-2013 |
20130114409 | LINK ADVERTISEMENT FOR PATH COMPUTATION IN A COMMUNICATIONS NETWORK - A path computation element for a communications network, receives link advertisements from hybrid nodes ( | 05-09-2013 |
20130216216 | OPTICAL NETWORK NODE WITH RESTORATION PATH - A node for an optical network has an electrical selector ( | 08-22-2013 |
20140023364 | ESTABLISHING CONNECTIONS IN A MULTI-RATE OPTICAL NETWORK - An optical transmission network comprises nodes which support a plurality of different wavelength channels and support at least a first bitrate traffic type and the second bitrate traffic type on respective wavelength channels. A connection of the second bitrate traffic type is established on an available wavelength, if the wavelength offers an acceptable quality of transmission using a first quality of transmission calculation. Alternatively, a connection of the second bitrate traffic type is established on a wavelength which is spaced, by a guard band, from wavelengths used for connections of the first bitrate traffic type, if the wavelength offers an acceptable quality of transmission using a second quality of transmission calculation. The second quality of transmission calculation is less stringent than the first quality of transmission calculation, and can ignore the effects of interference due to cross-phase modulation. The guard band is a wavelength spacing at which the interference between a connection of the first bitrate traffic type and a connection of the second bitrate traffic type is less than a predetermined amount. | 01-23-2014 |
20140023372 | METHOD AND APPARATUS FOR DYNAMIC WAVELENGTH ALLOCATION IN WAVELENGTH SWITCHED OPTICAL NETWORKS - A method of allocating a wavelength to a lightpath in a wavelength multiplex for use in an optical network comprising nodes connected by optical links, wherein the wavelength multiplex is adapted to support lightpaths of two different bitrates. The disclosed method allows for efficient allocation of wavelengths that prevents wasting bandwidth and mitigates detrimental effects of cross-phase modulation. | 01-23-2014 |
20140078895 | PATH COMPUTATION OF WORKING AND RECOVERY PATHS - Computing working paths and recovery paths in a telecommunications network having nodes capable of supporting different recovery schemes, is based on traffic demands having an indication of a desired recovery service level, for that demand. A path computation is carried out to select a working path through the network for each of the traffic demands and to select which of the different recovery schemes to use according to the service level. The selected working paths and their associated recovery schemes are then set up in the network. By leaving the selection of the recovery scheme to the path computation stage, network resources can be used more efficiently, and operators can specify resiliency in terms of needs rather than in terms of the technology of the network. Thus operators can be insulated from the detailed knowledge of the network. | 03-20-2014 |
20140093246 | METHOD OF CONFIGURING AN OPTICAL PATH, A PATH COMPUTATION ENGINE AND AN OPTICAL COMMUNICATIONS NETWORK NODE - A method of configuring an optical path, comprising: selecting a path from a first to a second node in an optical communications network; identifying each wavelength that may be used continuously across the path and selecting a transmission wavelength for the optical path one of the identified wavelengths for which: a fixed wavelength direction-bound add/drop transponder add operable at said wavelength is available at each node; if that first requirement is not met, a fixed wavelength direction-bound add/drop transponder or a fixed wavelength directionless add/drop transponder operable at said wavelength is available at each node; and if that second requirement is not met, a tunable wavelength direction-bound add/drop transponder or a tunable wavelength directionless add/drop transponder operable at said wavelength is available at each node. | 04-03-2014 |
20140307538 | Apparatus and Method for a Communication Network | 10-16-2014 |
20140328214 | BUILDING TOPOLOGY IN COMMUNICATIONS NETWORKS - The present proposal provides a specific solution for communications network topology summarization with a good trade-off between high scalability, good stability and resources utilization efficiency. | 11-06-2014 |
20140341572 | Routing and Bandwidth Assignment for Flexible Grid Wavelength Switched Optical Networks - 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. | 11-20-2014 |