Multiplex communications – Pathfinding or routing – Switching a message which includes an address header
Reexamination Certificate
1997-07-17
2001-08-28
Ngo, Ricky (Department: 2664)
Multiplex communications
Pathfinding or routing
Switching a message which includes an address header
C370S522000, C379S220010
Reexamination Certificate
active
06282202
ABSTRACT:
THE TECHNICAL FIELD OF THE INVENTION
The present invention generally relates to telecommunications systems, and specifically to software systems for a telecommunications system, that includes hardware and software components with specific functions, and to which several users are connected. The invention also relates to methods of structuring software in telecommunications systems of the kind just mentioned.
More specifically the invention relates to internal communication between service controlling entities in traffic courses in a telecommunication system, said service controlling entities belonging to logical nodes in the same or different telecommunication service networks.
With service controlling entities is here meant e.g. service processes controlling service for a part in a call. Among types of service processes which may occur in a communication network may be mentioned traffic control processes for user access and network access.
By saying that a service controlling entity belongs to a logical node is here meant that it shall be specified in the logical node. The realization thereof in software is constituted by executing functions in the logical node. The software for the service controlling entities in a logical node may be distributed on different processors controlled by a distributed operating system. The concept of a logical node will here mean a group of functions to be installed together in a system. The logical node is defined in a reference model for the logical network and is specified in a node function model. Typical logical nodes are N-ISDN (narrow band ISDN) network access, N-ISDN user access, and B-ISDN (broad band ISDN) network access and B-ISDN user access.
By the concept of telecommunications service networks, or shortly below also service networks, is here furthermore meant a logical network for telecommunications services. Examples of service networks are PSTN, N-ISDN, B-ISDN, PLMN-GSM, VPN etc.
DESCRIPTION OF RELATED ART
In the U.S. patent application Ser. No. 07/723,166 a software system for controlling a telecommunication exchange is described. The system in question includes a plurality of application modules located in the exchange and intended to provide telecommunications services for users connected to the exchange. Each application module contains control instructions and data for implementing a specific telecommunications application. Resource modules provide common functional elements used by the application modules. The resource modules have access to and control hardware components of the exchange necessary for performing the specific functional activities. Communications may be established between each of the application modules and each other application module and each resource module in the exchange for providing the telecommunications services of each application module to users without the use of control instructions or data from any other application module. Network protocols control the communication between the application modules in the exchange. The communications between the resource modules and between the application modules and the resource modules in the exchange is carried through via interfaces.
In EP 0 432 924 a data communication architecture is described in which high level communication services for a central computer are arranged in independent horizontal functions which are managed in parallel. Conditional dependencies between the horizontal functions are solved by a means establishing interfaces between the horizontal functions and an application layer of the central computer. The communication is improved by admitting adaptive specification of a high level protocol used in the architecture for providing the high level services. This adaptive specification may be initiated in response to changing user demands or varying network parameters. In the protocol specification suitable values of parameters for the horizontal functions are selected, which are parametrically programmable.
In EP 0 513 799 a system is described for supporting entering or referencing a data value or a structural value which constitutes a component of a protocol data unit. The syntax of this unit is defined in accordance with ISO8824 and it is coded/decoded in accordance with ASN.1 rules in ISO8825.
In the U.S. Pat. No. 4,967,193 a method is described for communication with a protocol used in a telecommunication system with at least one central computer connected to a plurality of digital interface units via a communication module. Each digital interface unit is connected to a plurality of channel units. From the computer to the communication module an instructional message is sent with at least a first address of a selected interface unit, an address of a selected channel unit, a second address which is essentially identical to the first interface unit address, and a first information part. The instructional message from the communication module is sent to the digital interface units, the selected interface unit receiving the instructional message. In the selected interface unit the first address is removed from the instructional message for forming a modified message. The modified message is sent from the selected interface unit to the channel units, the selected channel unit receiving the modified message. The selected module provides a response message to the computer. The protocol provides a response format identifying the responding module, the type of response, and, in case of error, where the error was detected and which type of error there was.
In the U.S. Pat. No. 5,276,816 a system is described for interpreting messages sent from an input/output unit to an application object in an object oriented environment, so that the message interpretation of these messages remains consistent independent of the input/output unit used for generating them. Dynamical binding is used for interpreting all object-object interactions which may appear. This admits the use of further input/output units in the object oriented environment without the need for updating all application objects therein.
In the European patent application 0 505 092 a system is described for use by a computer for controlling a device for providing a plurality of services for a plurality of entities. Each entity exactly corresponds to one of the services and each service has its own copy of the code defining the service. The system associates a process executing the service with every service. The code for a service defines a finite state machine which is continuously executed by the service process. In a distinct state the state machine may move along a decision diagram which is directly accessible to the process. Measures to be taken at the passing of a node in the decision diagram may be defined in the state machine. The service process communicates with other processes and with itself via interprocess messages. Each state of the state machine includes event handlers for responding to messages which have been received by the service process.
EP 555 997 relates to protocol controlled communication between entities in a distributed computer system. A generic protocol is used in which it is possible to send a protocol description in a language which is independent of any applications. Each entity has the possibility to interpret which protocol is described in the generic protocol guided by the application independent language. Alternatively, the protocol interpreter in a receiving entity may be equipped with a protocol description in a memory, whereby it is only necessary to send a protocol identifier in the generic protocol.
WO 94/6251 i.a. discloses a signalling protocol for telecommunications networks. The nodes of the network are interconnected with a connection network. The communication between the nodes is performed with two different protocols, one basic protocol used for providing signal paths between service related software groups and one or more specific protocols.
EP 350 844 describes a method for transferring program parameters from an exchange to terminals.
Alvenkrona Hans
Bäckström Sven
Graf Leslie
Hågård Göran
Hillborg Mikael Lennart
Burns Doane Swecker & Mathis L.L.P.
Ngo Ricky
Telefonaktiebolaget LM Ericsson (publ)
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