Electrical computers and digital processing systems: multicomput – Computer-to-computer session/connection establishing – Network resources access controlling
Reexamination Certificate
1998-07-08
2001-03-20
Lim, Krisna (Department: 2758)
Electrical computers and digital processing systems: multicomput
Computer-to-computer session/connection establishing
Network resources access controlling
C709S226000
Reexamination Certificate
active
06205484
ABSTRACT:
TECHNICAL FIELD OF THE INVENTION
This invention relates to the field of resource reservation, and in particular to a method of controlling access to a communications network, and to a network using such a method.
DESCRIPTION OF RELATED ART
The Internet is a communications network which is becoming widely available. The Internet provides a “best effort” bearer service. That is, the user receives the best service available at the time he requests it, but no commitments are given to the user in terms of available bandwidth, transit delay, or packet loss. The Internet is particularly useful in data communications applications, but is of limited use for telecommunications applications which require guaranteed bandwidth availability, and specify maximum values for the transit delay and loss of data. The Internet cannot usually guarantee the required quality of service.
One conventional way of achieving resource reservation, to be able to provide a required quality of service commitment, is to use connection states to store information in the network nodes about bandwidth, buffer parameters, connection identity and status. However, an advantage of the Internet is that it is a connectionless network, which therefore cannot use this technique without sacrificing the simplicity of the Internet.
One conventional way of achieving bearer service differentiation, in a connectionless network, is to use a set of priority bits in the packet header. However, in a public connectionless network, it is still necessary to control how many connections use the highest available priority. If every connection uses the highest available priority, the network can still in effect only offer a best effort service to the users.
A problem remains, therefore, as to how to control admission to the network.
SUMMARY OF THE INVENTION
The present invention seeks to solve the problem of achieving admission control and resource reservation in a connectionless network.
A further object of the invention is to provide a method of access control which, in preferred embodiments, allows service differentiation in a form which permits a user to receive a quality of service guarantee which is better than a “best effort” service.
According to the invention, each transmission by a user across the network includes a message sent to the user from the network. The message includes information about the priority level of the transmission, based on the user's contract with the network provider, and can subsequently be extracted by the network to determine how to handle the transmission.
Thus, rather than rely on the network being able to detect the status of the connection, the relevant information is transmitted by the user with the data transmission, and can be extracted by the network as required.
For a better understanding of the present invention, and to show how it may be brought into effect, reference will now be made, by way of example, to the accompanying drawings.
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Jenkens & Gilchrist P.C.
Lim Krisna
Telefonaktiebolaget LM Ericsson
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