摘要:
A method for estimation of the distance from a domain by means of a fragment based model, the method comprising the steps of identifying the fragments [r 1 to r n ] in a structure. Comparing the or each fragment with one or more fragments in the model. If the or each fragment substantially matches a fragment in a model determining a first error measure between the activity of the or each fragment and activity of the matching fragment in the model. If the or each fragment does not substantially match a fragment in the model determining which fragment in the model is the most similar to the or each fragment and determining a second error measure based on the similarity between the fragment and the most similar fragment. A step of combining the first error measure and the second error measure to generate a degree of separation between the activity of the structure and of the combined fragments in the model is then carried out. This method allows the calculation of a prediction even if there is the problem of missing fragments and allows a level of uncertainty (error) to be determined for the prediction.
摘要:
Constrained operation performance of exchanges (50) and switches (16, 216) of wireline communication systems (10) is mitigated and single entry point management of the system maintained through the provision of a distributed multi-service hub (MSH) sub-net (350) architecture in which individual MSHs (302-308) have hidden point codes (1001-1003). A signalling server (352) is able to translate an address of the MSH sub-net into a point code associated with an MSH entry point into the MSH sub-net, while dialled digit information pertaining to a service or party identifies a related MSH exit point from the MSH sub-net (350). A path can therefore be established, with the signalling server (352) further required to ensure that the hidden point code associated with the MSH exit point is translated back to the address of the MSH sub-net in onward routing of signalling messages to the dialled service or party. An intermediate element manager EM 2 (312) isolates a management server OSS (54) from element managers (314-322) associated with the control of individual MSHs (302-310), with the intermediate EM 2 (312) therefore providing a single address point to the OSS (54) while itself appearing as an OSS to the element managers (314-322) of individual MSHs (302-310). Signalling and management functions can therefore be consolidated at the intermediate EM 2 (312) to increase efficiency and reduce overhead.
摘要:
A trail management system for a transport network comprises a database storing data describing each of a plurality of actual and intended/planned trails within a network. Each trail is described in terms of a state model, in which the trail is recorded as being in one of a plurality of stable states, eg ready for service (1100), not ready for service (1101), existing in the network but not fully recorded in the network management system (1102), or assigned for deletion from the network (1103). The trail data is modified by a set of automatic processes, by means of which a trail data may transition between stable states. Each trail data may adopt one of a plurality of sub-states, eg fully provisioned, incomplete, in conflict with another trail, inconsistent with another trail, unprovisioned, or unsupported by network resources. The network management system learns of actual existing trails within the network and checks for consistency of actual trails with stored trail data.
摘要:
An optical amplifier arrangement comprises a splitter for providing an input WDM optical signal on at least first and second output paths. An optical amplifier is provided in at least one of the paths, and a signal routing arrangement is provided for routing individual channels or groups of channels of the WDM signal within the at least one of the paths. A switch selects the signal from one of the at least first and second output paths. In this arrangement, there are two paths between the input and output. Whilst one path is being used, the components in the other path can be upgraded. For example, a switching arrangement may be provided in the other path, and an amplifier may also be upgraded, without disrupting service in the path in use. This enables an amplifying node within an optical communications system to be incrementally upgraded.
摘要:
There is presented a method for integrating management functionality in communications networks by virtue of a design model for constructing a management information base in a communications network management system. A unit of manageable physical resources is represented in the management information base by a management unit. The management unit comprises a collection of managed objects representing actual physical and logical resources in the communications network, the managed objects arranged such that functionality provided by the physical and logical resources is represented separately and independently from the actual physical and logical resources themselves, in the particular way in which those resources are implemented. A unit of manageable functionality and resources is represented in the management information base by a management unit. A management unit comprises an Application Model, which represents functionality of those resources, and an Implementation Model, which represents the actual specific implementation of how that functionality is carried out. The Application Model and Implementation Model are related to each other by a set of associations, presented in the disclosure, termed "realisation associations". A collection of realisation associations which link an Application Model to an implementation form a realisation model. Division and representation of physical and logical resources in the management information base by the management unit method may enable substitution of physical and logical resources by different implementations of similar resource components without requiring reconfiguration of parts of the management information base which represent the functionality provided by those physical resources. Greater reuse of design and development effort may be achieved by configuring the management information base in the method disclosed, and easier maintenance and replaceability of physical and logical components may be achieved.
摘要:
One aspect of the invention provides an apparatus for modelling a plurality of switching operations arranged in a plurality of switching stages. The apparatus comprises a respective switch stage component for each switching stage, and each switch stage component comprises a respective addressable switch state indicator for each switching operation associated with the respective switching stage. The values of the switch state indicators in a given switch stage component identify a respective switch state indicator in another switch stage component. The switch stage components are interconnected such that addressing a switch state indicator in one switch stage component causes the respective identified switch state indicator in another switch stage component to be addressed. In the preferred embodiment, each switch stage component comprises a respective Look-Up Table.
摘要:
The present invention relates to soft handoffs in an OFDM system. Each mobile terminal measures pilot signal strengths of transmissions from adjacent base stations. If the pilot signal strength for a base station exceeds the defined threshold, that base station is added to an active set list. Each mobile terminal notifies the base stations of their active set lists. By providing the set list to the base station controller and the servicing base station, the mobile terminal identifies the sole servicing base station or triggers a soft handoff mode when multiple base stations appear on the active set list. The soft handoff mode uses a combination of scheduling and space-time coding to affect efficient and reliable handoffs.
摘要:
The invention relates particularly to the switching of an SDH low order VC-3 using a high order switching apparatus, such as an STS switch. A low order VC-3 is aligned with a TU-3 pointer to form a TU-3. The TU-3 is mapped into a high order VC-3 type data structure which, in turn, is aligned with an AU-3 pointer to form an AU-3 type data structure. The AU-3 type data structure is suitable for switching by the high order switch. After switching, the AU-3 type data structure is combined with similar AU-3 type data structures and converted into an AU-4 suitable for transmission across an SDH/SONET network. Advantageously, the arrangement is such that each AU-3 pointer has the same fixed value. Hence, conversion to an AU-4 is achieved by a fixed pointer replacement operation. The invention significantly reduces the amount of pointer processing that is required in comparison with conventional techniques for switching low order VC-3s using low order VT/TU switches and in comparison with a ITU-T standards compliant approach for switching low order VC-3s using a high order switch. The present invention relates to the switching of low order data structures. In particular, the invention relates to switching an SDH low order VC-3 using a high order switching apparatus.