Communication system having a limited number of communication channels
First Claim
1. Method of controlling communication links in a communication system, each communication link occupying at least one communication channel and being used for communications between at least two communication devices, comprising:
- detecting a request for a first communication link;
establishing the requested communication link if free communication channels are available; and
if free communication channels are not available;
detecting at least one second communication link occupying at least two communication channels;
releasing at least one of the communication channels of the at least one second communication link; and
establishing the first communication link using the at least one released communication channel; and
wherein, in case communication channels become available, these communication channels are used by the at least one second communication link until an original state thereof is reestablished.
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Accused Products
Abstract
Method of controlling communication links in a communication system, each communication link occupying at least one of a limited number of communication channels and being used for communications between communication devices. The invention allows a requested first communication link to be established, even if a free communication channel is not available. Control means are provided to determine at least one second communication link which uses at least two communication channels and to initiate a release procedure for at least one of the communication channels of the identified communication link. The released communication channel is used to establish the requested first communication link. After termination of the requested and established link, the communication channel may be returned to restore the at least one second communication link. The invention can equally be applied to ISDN-systems as well as to mobile communication networks.
21 Citations
18 Claims
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1. Method of controlling communication links in a communication system, each communication link occupying at least one communication channel and being used for communications between at least two communication devices, comprising:
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detecting a request for a first communication link;
establishing the requested communication link if free communication channels are available; and
if free communication channels are not available;
detecting at least one second communication link occupying at least two communication channels;
releasing at least one of the communication channels of the at least one second communication link; and
establishing the first communication link using the at least one released communication channel; and
wherein, in case communication channels become available, these communication channels are used by the at least one second communication link until an original state thereof is reestablished. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. Method of controlling communication links in a communication system, each communication link occupying at least one communication channel and being used for communications between at least two communication devices, comprising:
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detecting a request for a first communication link;
establishing the requested communication link if free communication channels are available; and
if free communication channels are not available;
detecting at least one second communication link occupying at least two communication channels;
sending a disconnect command from control means to the corresponding communication devices;
releasing at least one of the communication channels of the at least one second communication link;
receiving a release message from the communication devices;
sending a release complete message from the control means to the corresponding communication devices; and
establishing the first communication link using the at least one released communication channel; and
wherein, in case communication channels become available, these communication channels are used by the at least one second communication link until an original state thereof is reestablished. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. Communication system, comprising:
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a plurality of communication devices;
a plurality of communication links for communications between the plurality of communication devices, each communication link occupying at least one communication channel; and
control means including;
first detection means for receiving a request for a first communication link and for receiving a termination message in case a communication link is terminated;
second detection means for determining at least one second communication link occupying at least two communication channels, in case a free communication channel is not available; and
switching means for controlling a release of at least one communication channel of the at least one second communication link, and establishing the first communication link via the released communication channel; and
means for reestablishing, in case communication channels become available, the at least one second communication link to an original state thereof using these communication channels. - View Dependent Claims (18)
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Specification