Telephonic communications – Plural exchange network or interconnection – With interexchange network routing
Reexamination Certificate
1998-03-24
2001-11-27
Hong, Harry S. (Department: 2642)
Telephonic communications
Plural exchange network or interconnection
With interexchange network routing
C379S219000, C379S220010
Reexamination Certificate
active
06324278
ABSTRACT:
TECHNICAL FIELD
This invention relates to a switched telecommunication network comprising several exchanges which are directly or indirectly interconnected such that at least between individual pairs of exchanges more than two paths are possible, to a method of establishing a switched connection in a switched telecommunication network, to an exchange, and to a routing facility.
BACKGROUND OF THE INVENTION
Switched telecommunication networks are designed in such a way that the individual exchanges are more or less intermeshed. This means, on the one hand, that a connection can be established from any exchange of the network to any other exchange and, on the other hand, that as a rule, there is not only one possibility of routing the call, but more than one possibility, frequently three or more possibilities. This not only affords safety against disturbances but also results in a more uniform load distribution. There are many strategies to select an optimum possibility for each call attempt. In any case, at least the most recent attempts and their results are taken into account.
A problem arises from the fact that not all of the available possibilities are equivalent. On the one hand, individual ones of the possible paths are more expensive than others, and on the other hand, the capacities of the paths are partly very different.
SUMMARY OF THE INVENTION
The object of the invention is to provide a switched telecommunication network as well as suitable methods and components for further reducing the probability of unsuccessful call attempts.
This object Is attained by a switched telecommunication network comprising several exchanges which are directly or indirectly interconnected such that at least between individual pairs of exchanges, more than two paths are possible, and further comprising at least one routing facility which decides on the selection of the respective path to be used for each connection to be established and which does not select a path if it was blocked on the previous attempt, wherein the routing facility is designed not to select a path if the path is identical in sections with a path which was blocked on the previous attempt.
The object is also achieved by a method of establishing a switched connection in a switched telecommunication network comprising several exchanges which are directly or indirectly interconnected such that at least between individual pairs of exchanges, more than two paths are possible, and further comprising at least one routing facility which decides on the selection of the respective path to be used for each connection to be established and which does not select a path if it was blocked on the previous attempt, wherein the routing facility does not select a path if the path is identical in sections with a path which was blocked on the previous attempt.
The object is still further obtained by an exchange for a switched telecommunication network comprising several exchanges which are directly or indirectly interconnected such that at least between the exchange and another exchange, more than two paths are possible, and further comprising a routing facility which decides on the selection of the respective path to be used for each connection to be established and which does not select a path if it was blocked on the previous attempt, wherein the routing facility is designed not to select a path if the path is identical in sections with a path which was blocked on the previous attempt.
The object is also attained by a routing facility for a switched telecommunication network comprising several exchanges which are directly or indirectly interconnected such that at least between individual pairs of exchanges, more than two paths are possible, the routing facility being associated with at least one of the exchanges and designed to decide on the selection of the respective path to be used for each connection to be established and not to select a path even if it was blocked on the previous attempt, wherein the routing facility is designed not to select a path if the path is identical in sections with a path which was blocked on the previous attempt.
According to the invention, the fact that the paths between two exchanges are partly combined from a transmission point of view and then are jointly overloaded or even jointly disturbed is taken into account.
Further advantageous features of the invention are defined in the subclaims and will become apparent from the following description.
REFERENCES:
patent: 5390242 (1995-02-01), Bales et al.
patent: 5649108 (1997-07-01), Spiegel et al.
patent: 3626870 (1987-02-01), None
patent: 4308512 (1994-09-01), None
patent: 4428349 (1996-02-01), None
patent: 0696147 (1994-08-01), None
“Telekommunikationssysteme mit Leitweglenkung suchen die kostengunstigste Verbindung” by von Wlater Loffler, pp. 42-43 from Private Firmennetze.
Agdeppa Hector
Alcatel
Hong Harry S.
Ware Fressola Van der Sluys & Adolphson LLP
LandOfFree
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