EP0609654A2
Expired / Lapsed
EP
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Burst band-width reservation method in an asynchronous transfer mode (ATM) network
Assignee: NEC Corp
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Filing: 1994-01-05
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Granted: —
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Expires: 2014-01-05
Abstract
Abstract In an ATM network using a burst-level band-width allocation, a source terminal reserves, before a burst transmission, band-widths according to a peak rate of the burst and then sends the burst therethrough. When the transmission is finished, the band-widths are released. Where there exists a link to which the peak rate is not assigned, NACK is sent to the terminal and the reserved band-widths are released. On receiving the NACK, the terminal allocates a band-width with peak rate lower than that of the first request after a back-off time is elapsed, thereby minimizing the block probability of the transmission. The source terminal declares a minimum band-width together with the peak rate (maximum band-width) in the band-width request operation. Each node allocates the peak rate when the remaining band-width of a link controlled by the node is sufficient to allocate the peak rate. Even if the remaining band-width is insufficient, when the band-width is not less than the minimum band-width, there is allocated a band-width equal to or more than the minimum band-width and equal to or less than the peak rate according to the remaining band-width, thereby transferring the burst.
Inventors
- 👤 Chinatsu C/O Nec Corporation Ikeda
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-29 19:06
CPC Classifications
H; H04; H04L; H04L47/00; H04L47/70; H04L47/72; H04L47/724; H04L12/00; H04L12/54; H04L12/56; H04L12/5601; H04L12/5602; H04L47/74; H04L47/743; H04L47/746; H04L47/748; H04L47/82; H04L47/826; H04Q; H04Q11/00; H04Q11/04; H04Q11/0428; H04Q11/0478; H04L2012/5629; H04L2012/563; H04L2012/5631; H04L2012/5632; H04L2012/5634; H04L2012/5635
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
144 words
A burst band-width reservation method for use with an ATM network, comprising the steps of: connecting a source terminal via a plurality of nodes to a destination terminal; setting a path between an initiating node and a terminating node in a call set-up phase; reserving for each link on the path, prior to transmission of a burst from the source terminal, band-widths to send the burst therethrough, thereby transferring the the burst; releasing the reserved band-widths after the burst is completely transmitted; repeatedly conducting by the source terminal, at a failure of the band-width reservation on the path, a band-width re-reservation until band-widths are successfully reserved; and counting by the source terminal the number of successively failed attempts of the band-width reservation, thereby decreasing a request band-width at the band-width re-allocation for the burst transmission in accordance with the number of successively failed attempts.
Claim 2
Dependent Claim
53 words
A method as claimed in claim 1, further including the steps of: calculating by the source terminal the number of consecutively succeeded attempts of the band-width reservation; and decreasing by the source terminal a request band-width for the burst transmission from the source terminal in accordance with the number of consecutively succeeded attempts.
Claim 3
Dependent Claim
55 words
A method as claimed in claim 1, further including the steps of: calculating by the source terminal the number of consecutively succeeded attempts of the band-width reservation; and increasing a back-off period of time for the band-width re-reservation at a failed attempt of the band-width reservation in accordance with the number of successively failed attempts.
Claim 4
Dependent Claim
79 words
A method as claimed in claim 1, 2, or 3, wherein the source terminals includes: means for repeatedly conducting, at a failure of the band-width reservation on the path, a band-width re-reservation until band-widths are successfully reserved; means for counting the number of successively failed attempts of the band-width reservation; and means for altering a request band-width, thereby decreasing the request band-width at the band-width re-allocation for the burst transmission in accordance with the number of successively failed attempts.
Claim 5
Dependent Claim
47 words
A method as claimed in claim 4, wherein the source terminal includes means for counting the number of consecutively succeeded attempts of the band-width reservation, thereby increasing the request band-width for the burst transmission from the source terminal in accordance with the number of consecutively succeeded attempts.
Claim 6
Dependent Claim
48 words
A method as claimed in claim 5, wherein the source terminal includes means for altering the back-off period of time for a re-reservation of a band-width at a failed attempt of the band-width reservation, thereby increasing the back-off period of time according to the number of succeeded attempts.
Claim 7
Dependent Claim
138 words
In an ATM network in which a source terminal is connected via a plurality of nodes to a destination terminal and a burst is transferred therethrough, the source terminal decides at an occurrence of a loss of a burst cell in a burst transmission that the pertinent transmission has been failed and calculates the number of failed burst transmissions, the source terminal decides when a cell transmission is achieved without any cell loss that the transmission is successfully conducted and calculates the number of succeeded burst transmissions, the source terminal increases an interval between cell transmissions in accordance with the number of failed burst transmissions, thereby decreasing a peak rate defined by the interval, and the source terminal decreases the interval between cell transmissions in accordance with the number of succeeded burst transmissions, thereby increasing the peak rate.
Claim 8
Dependent Claim
135 words
In the AIM network as claimed in claim 7, the source terminal includes: means operative at an occurrence of a loss of a burst cell in a burst transmission for deciding an event that the pertinent transmission has been failed; means for calculating the number of failed burst transmissions; means operative when a cell transmission is achieved without any cell loss that the transmission is successfully conducted; means for calculating the number of succeeded burst transmissions; and means for altering a peak rate defined by an interval of the transmitted burst cells, the source terminal increasing the interval in accordance with the number of failed burst transmissions, thereby decreasing the peak rate, the source terminal decreasing the interval between cell transmissions in accordance with the number of succeeded burst transmissions, thereby increasing the peak rate.
Claim 9
Dependent Claim
176 words
A burst band-width reservation method for use with an ATM network, comprising the steps of: connecting a source terminal via a plurality of nodes to a destination terminal; setting a path between an initiating node and a terminating node in a call set-up phase; and reserving by the source terminal band-widths for all links on the path prior to transmission of a burst therefrom, transferring the burst therethrough to the destination terminal, and releasing the reserved band-widths after the burst is completely transmitted, the band-width reservation being achieved by sending to the initiating node, prior to the burst transmission, a signal indicating a maximum band-width and a minimum band-width necessary for the burst transfer, each node on the path reserving, according to the maximum band-width and the minimum band-width and a remaining band-width of a link managed by the node, a band-width equal to or more than the minimum band-width and equal to and less than the maximum band-width according to the remaining band-width, the remaining band-width being equal to or more than the minimum band-width.
Claim 10
Dependent Claim
71 words
A method as claimed in claim 9, wherein each of a second and subsequent nodes on the path reserves in a manner similar to that of the first node a band-width equal to or more than the minimum band-width and equal to and less than a band-width allocated by the previous node, the remaining band-width of a link controlled by the node being equal to or more than the minimum band-width.
Claim 11
Dependent Claim
110 words
A method as claimed in claim 10, wherein: the first node on the path reserves a band-width obtained by a function f(P1, P2, C) according to the maximum band-width P1, the minimum band-width P2, and a remaining band-width of a link controlled by the node; and each of the second and subsequent nodes on the path reserves in a manner similar to that of the first node a band-width obtained by a function f (P3, P2, C) according to a band-width P3 allocated by a previous node, the minimum band-width P2, and the remaining band-width C, the remaining band-width C being equal to or more than the minimum band-width P2.
Claim 12
Dependent Claim
101 words
A method as claimed in claim 9, 10, or 11, further including the steps of: repeatedly conducting by the source terminal, at a failure of the band-width reservation on the path, a band-width re-reservation until band-widths are successfully reserved; minimizing by the source terminal a request band-width at the band-width re-allocation in accordance with the number of failed attempts of band-width reservation; and decreasing by the source terminal the request band-width at the band-width re-allocation for the burst transmission in accordance with the number of failed attempts and the remaining band-widths of the links until the band-width reservation is successfully achieved.
References Cited (Backward Citations)
No citation records indexed.
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