US6160793A
Expired / Lapsed
US
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ECN-based approach for congestion management in hybrid IP-ATM networks
Assignee: Nokia Technologies Oy
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Filing: 1998-10-13
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Granted: 2000-12-12
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Expires: 2018-10-13
Abstract
Abstract A method and apparatus for coupling IP ECN with ATM congestion control is disclosed. The invention extends IP-ECN to ATM devices with minimal implementation complexity. Thus, the performance of IP data traffic over ATM is enhanced without requiring packet-reconstruction at the ATM layer. The method includes using AAL5 packet trailers in ATM cells to detect packet boundaries for identifying a first cell in an IP packet, determining whether an ATM cell capable of using explicit congestion notification to indicate congestion and setting a explicit congestion notification indicator in a capable ATM cell to indicated congestion to a source node. The use of the packet trailers further comprises monitoring a flag for indicating whether an ATM cell is an end of packet. The method further includes resetting the end of packet flag to an off state to so the next cell is recognized a first cell of a packet and transmitting the ATM cell. A determination is made as to whether a next ATM cell is a first ATM cell for a packet. The next ATM cell is transmitted when the ATM cell is not a first ATM cell for a packet. A determination is then made as to whether ATM congestion is associated with the next ATM cell. The next ATM cell is then transmitted when congestion is not associated with the next ATM cell.
Inventors
- 👤 Nasir Ghani
- 👤 Sudhir Dixit
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:10
CPC Classifications
H; H04; H04L; H04L47/00; H04L47/10; H04L12/00; H04L12/54; H04L12/56; H04L12/5601; H04L12/5602; H04L47/26; H04L47/35; H04Q; H04Q11/00; H04Q11/04; H04Q11/0428; H04Q11/0478; H04L2012/5629; H04L2012/5631; H04L2012/5632; H04L2012/5635; H04L2012/5638; H04L2012/5646; H04L2012/5647; H04L2012/5651; H04L2012/5652; H04L2012/5653; H04L2012/5658; H04L2012/5665; H04L2012/5667; H04L47/43; H04L47/431
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
64 words
A method for congestion management in hybrid IP-ATM networks, comprising: using AAL5 packet trailers in ATM cells to detect packet boundaries for identifying a first cell in an IP packet; determining whether an ATM cell is capable of using explicit congestion notification to indicate congestion; and setting an explicit congestion notification indicator in a capable ATM cell to indicate congestion to a source node.
Claim 2
Independent Claim
64 words
A method for congestion management in hybrid IP-ATM networks, comprising: using AAL5 packet trailers in ATM cells to detect packet boundaries for identifying a first cell in an IP packet; determining whether an ATM cell is capable of using explicit congestion notification to indicate congestion; and setting an explicit congestion notification indicator in a capable ATM cell to indicate congestion to a source node.
Claim 3
Dependent Claim
26 words
The method of claim 1 wherein the using packet trailers further comprises monitoring a flag for indicating whether an ATM cell is an end of packet.
Claim 4
Dependent Claim
35 words
The method of claim 2 further comprising resetting the end of packet flag to an off state so the next cell is recognized as a first cell of a packet and transmitting the ATM cell.
Claim 5
Dependent Claim
21 words
The method of claim 3 further comprising determining whether a next ATM cell is a first ATM cell for a packet.
Claim 6
Dependent Claim
25 words
The method of claim 4 further comprising transmitting the next ATM cell when the ATM cell is not a first ATM cell for a packet.
Claim 7
Dependent Claim
18 words
The method of claim 4 further comprising determining whether ATM congestion is associated with the next ATM cell.
Claim 8
Dependent Claim
22 words
The method of claim 6 further comprising transmitting the next ATM cell when congestion is not associated with the next ATM cell.
Claim 9
Dependent Claim
125 words
An ATM switch, comprising: receive ports for receiving ATM cells thereon; a buffer, coupled to the receive ports, for storing ATM cells for processing; a processor, coupled to the buffer, for controlling the processing of the ATM cells; and transmit ports, coupled to the buffer, for transmitting the ATM cells in the buffer; wherein the processor providing congestion management in hybrid IP-ATM networks, the processor using AAL5 packet trailers in the received ATM cells to detect packet boundaries for identifying a first cell in an IP packet; determining whether the first cell in an IP packet is capable of using explicit congestion notification to indicate congestion and setting an explicit congestion notification indicator in a capable ATM cell to indicate congestion to a source node.
Claim 10
Dependent Claim
125 words
An ATM switch, comprising: receive ports for receiving ATM cells thereon; a buffer, coupled to the receive ports, for storing ATM cells for processing; a processor, coupled to the buffer, for controlling the processing of the ATM cells; and transmit ports, coupled to the buffer, for transmitting the ATM cells in the buffer; wherein the processor providing congestion management in hybrid IP-ATM networks, the processor using AAL5 packet trailers in the received ATM cells to detect packet boundaries for identifying a first cell in an IP packet; determining whether the first cell in an IP packet is capable of using explicit congestion notification to indicate congestion and setting an explicit congestion notification indicator in a capable ATM cell to indicate congestion to a source node.
Claim 11
Dependent Claim
27 words
The ATM switch of claim 8 wherein the using packet trailers further comprises monitoring a flag for indicating whether an ATM cell is an end of packet.
Claim 12
Dependent Claim
35 words
The method of claim 9 further comprising resetting the end of packet flag to an off state so the next cell is recognized as a first cell of a packet and transmitting the ATM cell.
Claim 13
Dependent Claim
21 words
The method of claim 10 further comprising determining whether a next ATM cell is a first ATM cell for a packet.
Claim 14
Dependent Claim
25 words
The method of claim 11 further comprising transmitting the next ATM cell when the ATM cell is not a first ATM cell for a packet.
Claim 15
Dependent Claim
18 words
The method of claim 11 further comprising determining whether ATM congestion is associated with the next ATM cell.
Claim 16
Dependent Claim
22 words
The method of claim 13 further comprising transmitting the next ATM cell when congestion is not associated with the next ATM cell.
Claim 17
Dependent Claim
83 words
An article of manufacture for a processor-based ATM switch, the article of manufacture comprising a computer readable medium having instructions for causing a processor to perform a method comprising: using AAL5 packet trailers in ATM cells to detect packet boundaries for identifying a first cell in an IP packet; determining whether an ATM cell is capable of using explicit congestion notification to indicate congestion; and setting an explicit congestion notification indicator in a capable ATM cell to indicate congestion to a source node.
Claim 18
Dependent Claim
83 words
An article of manufacture for a processor-based ATM switch, the article of manufacture comprising a computer readable medium having instructions for causing a processor to perform a method comprising: using AAL5 packet trailers in ATM cells to detect packet boundaries for identifying a first cell in an IP packet; determining whether an ATM cell is capable of using explicit congestion notification to indicate congestion; and setting an explicit congestion notification indicator in a capable ATM cell to indicate congestion to a source node.
Claim 19
Dependent Claim
26 words
The method of claim 15 wherein the using packet trailers further comprises monitoring a flag for indicating whether an ATM cell is an end of packet.
Claim 20
Dependent Claim
37 words
The article of manufacture of claim 16 further comprising resetting the end of packet flag to an off state so the next cell is recognized as a first cell of a packet and transmitting the ATM cell.
Claim 21
Dependent Claim
21 words
The method of claim 17 further comprising determining whether a next ATM cell is a first ATM cell for a packet.
Claim 22
Dependent Claim
25 words
The method of claim 18 further comprising transmitting the next ATM cell when the ATM cell is not a first ATM cell for a packet.
Claim 23
Dependent Claim
18 words
The method of claim 18 further comprising determining whether ATM congestion is associated with the next ATM cell.
Claim 24
Dependent Claim
22 words
The method of claim 20 further comprising transmitting the next ATM cell when congestion is not associated with the next ATM cell.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2003-12-12 | 2004-06-12 | 2004-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2007-12-12 | 2008-06-12 | 2008-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2011-12-12 | 2012-06-12 | 2012-12-12 | $7700.00 | Window Closed / Lapsed |