Telephonic communications – Plural exchange network or interconnection – With interexchange network routing
Reexamination Certificate
1999-09-29
2003-01-21
Matar, Ahmad F. (Department: 2642)
Telephonic communications
Plural exchange network or interconnection
With interexchange network routing
C379S137000, C379S112080, C379S240000, C379S241000
Reexamination Certificate
active
06510218
ABSTRACT:
FIELD OF THE INVENTION
The present invention concerns a method of directional distribution of allocation in two-way alternate line bundles.
Related Technology
Line bundles in voice and data networks switched between computer-controlled exchange facilities are generally operated as two-way alternate lines. In this operating mode, both exchange facilities independently of one another can access free lines of the bundle and occupy them. The full capability of the line bundle is utilized in this way. However, with this operating mode there is the risk that when one direction of traffic is temporarily dominant, traffic flow in the other direction may be hindered or even displaced. The grade of service in this direction is thereby greatly reduced.
Two traffic management methods for preventing such displacement are known. The first method operates by introducing the traffic management function “trunk reservation” and in the second method by dividing the traffic connection in question three ways.
In “trunk reservation” one direction of traffic is preferred in that the last free line is kept free for this direction. This means that only the preferred direction can have access to the last free line. Thus, given the same starting situation, a requested connection in the direction that is not protected would be rejected and would thus fail.
The trunk reservation method yields the disadvantage that only one direction is protected, and traffic in the other direction can be displaced when the protected direction has a similarly high demand.
A method for democratically protecting both directions from displacement by the other direction is a three-way division of the traffic relationship in question. The lines of a bundle are divided into three partial bundles as follows: a directionally operated partial bundle for the basic traffic of the outgoing direction, a directionally operated partial bundle for the basic traffic of the incoming direction, and a partial bundle with two-way alternate operation which can be used in both directions by peak traffic.
When traffic in one direction is dominant, displacement of the traffic from the opposite direction can with the second method occur in the two-way alternate partial bundle but not in the directional partial bundle in the opposite direction.
A disadvantage of this operating mode is that full capability of a two-way alternate line bundle cannot be achieved. Thus, more lines are needed for handling a certain amount of traffic than are actually necessary.
Prior traffic management methods are summarized and described in principle in CCITT Recommendation E.412 “Network Management Controls” (10/92) by INTERN: TELECOMMUNICATION UNION.
SUMMARY OF THE INVENTION
An object of the present invention is to ensure the full capability of a two-way alternate bundle while at the same time precluding mutual displacement for both directions of traffic.
Therefore, an object of the present invention is to create a method of directional distribution of allocation in two-way alternate line bundles arranged between computer-controlled exchange facilities that will ensure full capability of the two-way alternate line bundle, preclude mutual displacement of the traffic in both directions and make the division ratio on one line adaptable exactly to the actual conditions.
The measure proposed according to the present invention is characterized in particular in the characterizing part of Patent Claim
1
.
Additional features of the present invention and embodiments are derived from the characterizing parts of Patent Claims
2
through
6
which follow Patent Claim
1
.
Advantages of the traffic management according to the present invention include that the full capability of the two-way alternate operating mode is utilized, and displacement in favor of one.
The method according to the present invention thus permits savings in numbers of lines and results in a balanced traffic distribution between the outgoing and incoming traffic of a line bundle and thus to an improvement in the grade of service—even under unusual traffic conditions.
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A. Toda, “Traffic Design of Telecommunication Network with Both-Way Circuit Operation,” Proceedings of the Twelfth International Teletraffic Congress—ITC12, Torino, Italy, Jun. 1-8, 1988, pp. 35-41.
A. Toda, et al., “Selection Method for Both-Way Circuit Groups Between Multiunit Offices,” Electronics and Communications in Japan, Part 1, vol. 69, No. 10, Oct. 1986, pp. 93-101.
A. Toda, “Traffic Control Strategies for a Both-Way Circuit-Group,” Electronics and Communications in Japan, Part 1, vol. 68, No. 9, Sep. 1985, pp. 88-97.
Proceedings of the Twelfth International Teletraffic Congress—ITC12, Bd. 1, 1.—Jun. 8, 1988 Torino (IT), Seiten 35-41, XP00279758 A. Toda: “Traffic design of telecommunications network with both-way circuit operation” siehe Siete 38, Absatz 3.2.
Electronics and Communications in Japan—Part 1—Communications, vol. 69, No. 10, Oct. 1986, Silver Spring (US), pp. 93-101, XP002038822. A. Toda Et Al: “Selection Method for both-way circuit groups between Multiunit Offices”.
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Bui Bing
Deutsche Telekom AG
Matar Ahmad F.
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