EP0464680A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Communication system using route setup procedure
Assignee: Fujitsu Ltd
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Filing: 1991-06-27
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Granted: —
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Expires: 2011-06-27
Abstract
Abstract A communication system using a network route establishing technique for a network having a plurality of nodes (11 to 18) connected through links (21 to 31), in which a route search message is delivered simultaneously in a plurality of directions from a sender node (11) through a network route to a destination node, and a confirmation is delivered from the destination through the network route back to the sender node, and accordingly, a network route is established. The communication system includes a device for detecting, at a node (13) through which a search message is to be transmitted, a possibility of a transmission of the search message beyond the node (13), a device for delivering a cancel message in the direction from which the search message has been transmitted, and a device for releasing the network route engaged by the search message, based on the delivered cancel message.
Inventors
- 👤 Hiroaki Komine
- 👤 Takafumi Chujo
- 👤 Keiji Miyazaki
- 👤 Takao Ogura
- 👤 Tetsuo Soejima
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-31 09:49
CPC Classifications
H; H04; H04L; H04L45/00; H04L45/26; H04L45/44
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
136 words
A communication system using a network route establishing technique for a network having a plurality of nodes connected through links, in which a route search message is delivered simultaneously in a plurality of directions from a sender node through a network route to a destination node, and a confirmation is delivered from said destination through the network route back to said sender node, and accordingly, the network route is established, said communication system comprising: means for detecting, at a node through which a search message is to be transmitted, a possibility of the transmission of said search message beyond said node; means for delivering a cancel message in the direction from which said search message has been transmitted; and means for releasing the network route engaged by said search message based on said delivered cancel message.
Claim 2
Dependent Claim
66 words
A communication system according to claim 1, wherein, at a node through which a message is to be transmitted, when it is detected that a further transmission of the search message is impossible, a cancel message is delivered in the direction from which said search message has been transmitted, and the network route engaged by said search message is released based on said delivered cancel message.
Claim 3
Dependent Claim
43 words
A system according to claim 1, wherein, when said node receives cancel messages through all links along which search messages have been delivered from said node, cancel messages are delivered from said node in the directions from which said search messages are received.
Claim 4
Dependent Claim
44 words
A system according to claim 1, wherein, when a vacant line at a node through which a search message is to be transmitted becomes unavailable, a cancel message is delivered and a release of the route engaged by said search message is carried out.
Claim 5
Dependent Claim
62 words
A system according to claim 1, wherein, when a search message is transmitted through a number of nodes and the number of the nodes through which said search message is transmitted becomes more than a predetermined number at one node, a cancel message is delivered from said node, and a release of the route engaged by said search message is carried out.
Claim 6
Dependent Claim
13 words
A system according to claim 4, wherein said predetermined number is made variable.
Claim 7
Dependent Claim
102 words
A system according to claim 1, wherein, when a search message is transmitted through a number of nodes and it is detected that the same message has already arrived through another route at a node, a cancel message is delivered from said node, and a release of the route engaged by said search message is carried out; said system comprising means for delivering a cancel message from a node at which a detection of an impossibility of a further transmission of a search message is carried out, and based on a said cancel message, releasing a route engaged by said search message.
Claim 8
Dependent Claim
121 words
A communication system using network route establishing technique for a network having a plurality of nodes connected through links in which a route search message is delivered simultaneously in a plurality of directions from a sender node through a route to a destination node, and a confirmation message is delivered from said destination node through the route back to the sender node, and accordingly, a network route is established, said communication system comprising means for holding in a node a search message which has arrived at said node later than a previously transmitted message, and delivering said search message held in said node from said node, based on an establishing or release of a route established by said previously transmitted message.
Claim 9
Dependent Claim
80 words
A system according to claim 8, wherein, when it is detected at a node that a preceding search message has already been transmitted through a different route a search message arriving at said node later than said preceding search message is held in said node, and a notification of the state of the holding of said later arrived search message in said node to a sender node from which said later arrived search message has been delivered is carried out.
Claim 10
Dependent Claim
62 words
A system according to claim 8, wherein, when it is detected at a node that a preceding search message has already been transmitted through a different route, a time limit for holding a later arrived search message in said node is preselected, and upon the expiration of said preselected limit time a cancellation of said later arrived search message is carried out.
Claim 11
Dependent Claim
28 words
A system according to claim 10, wherein a measuring of elapse of time is carried out at a node in which said later arrived search message is held.
Claim 12
Dependent Claim
29 words
A system according to claim 10, wherein a measuring of an elapse of time is carried out at a node whereat a detection of a fault is carried out.
Claim 13
Dependent Claim
85 words
A system according to claim 8, wherein, when it is detected at a node that a preceding search message has already been transmitted through a different route, search messages arriving at said node later than said preceding search message are successively held in said node, and when the route engaged by the preceding search message is established or released, deliveries of the search messages held in said node are made in accordance with a priority of a sequence of an arrival thereat from said node.
References Cited (Backward Citations)
No citation records indexed.
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