US6449276B1
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for efficient switching of partial minicells in ATM adaptation layer 2
Assignee: Nokia Technologies Oy
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Filing: 1998-05-20
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Granted: 2002-09-10
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Expires: 2018-05-20
Abstract
Abstract A method of switching partial minicells in an AAL2 switching network without the need for re-assembly of the partial minicells at intermediate nodes. Identification of each remainder partial minicell ( 432 ) is accomplished using an 8-bit channel identifier ( 450 ), a double octet identifier ( 950 ) or a triple octet identifier ( 1050 ) depending on traffic requirements. Each partial minicell is immediately transmitted based upon the identification code attached to each partial minicell.
Inventors
- 👤 Baranitharan Subbiah
- 👤 Sudhir Dixit
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:03
CPC Classifications
H; H04; H04L; H04L49/00; H04L49/30; H04L49/3081; H04Q; H04Q11/00; H04Q11/04; H04Q11/0428; H04Q11/0478; H04L12/00; H04L12/54; H04L12/56; H04L12/5601; H04L2012/5638; H04L2012/5646; H04L2012/5652; H04L2012/5653; H04L2012/5656
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
147 words
A method of switching minicells, comprising the steps of: receiving a stream of ATM cells, wherein the ATM cells comprise complete minicells having an identification code in a header of the complete minicells to identify the complete minicells, first partial minicells having an identification code in a header of the first partial minicells to identify the first partial minicells, and remainder partial minicells having an identification code attached directly thereto to identify the remainder partial minicells, wherein a length of the identification code attached directly to the remainder partial minicells is dependent upon a traffic requirement of the ATM cells; and transmitting each minicell immediately based upon the identification code in the header of each minicell when the minicell is a complete minicell or a first partial minicell and based upon the identification code attached directly to the minicell when the minicell is a remainder partial minicell.
Claim 2
Independent Claim
147 words
A method of switching minicells, comprising the steps of: receiving a stream of ATM cells, wherein the ATM cells comprise complete minicells having an identification code in a header of the complete minicells to identify the complete minicells, first partial minicells having an identification code in a header of the first partial minicells to identify the first partial minicells, and remainder partial minicells having an identification code attached directly thereto to identify the remainder partial minicells, wherein a length of the identification code attached directly to the remainder partial minicells is dependent upon a traffic requirement of the ATM cells; and transmitting each minicell immediately based upon the identification code in the header of each minicell when the minicell is a complete minicell or a first partial minicell and based upon the identification code attached directly to the minicell when the minicell is a remainder partial minicell.
Claim 3
Dependent Claim
20 words
The method of claim 1 wherein the identification code attached directly to the remainder partial minicell is a channel identifier.
Claim 4
Dependent Claim
14 words
The method of claim 2 wherein the channel identifier is a one octet code.
Claim 5
Dependent Claim
32 words
The method of claim 2 wherein only a single channel identifier is used for each minicell so that the first partial minicell and the remainder partial minicell can not be further fragmented.
Claim 6
Dependent Claim
67 words
The method of claim 2 wherein the step of transmitting further comprises the steps of: determining a remaining available payload space for a current ATM cell; determining a size for a first remainder partial minicell; and inserting the first remainder partial minicell in the current ATM cell when the size for the remaining available payload space is greater than the size for the first remainder partial minicell.
Claim 7
Dependent Claim
36 words
The method of claim 5 further comprising the step of creating a new ATM cell for the remainder partial minicell when the remaining available payload space is less than the size for the remainder partial minicell.
Claim 8
Dependent Claim
31 words
The method of claim 5 further comprising the step of searching incoming AAL 2 connections for a minicell that is less than or equal to the size for the remaining payload.
Claim 9
Dependent Claim
26 words
The method of claim 1 wherein the identification code attached directly to the remainder partial minicell is a channel identifier code and a length indicator field.
Claim 10
Dependent Claim
18 words
The method of claim 8 wherein the channel identifier code and a length indicator field comprise two octets.
Claim 11
Dependent Claim
40 words
The method of claim 8 wherein the channel identifier code and a length indicator field being two octets in size allow a first partial minicell and a remainder partial minicell to be fragmented again before arriving at a final destination.
Claim 12
Dependent Claim
20 words
The method of claim 1 wherein the identification code attached directly to the remainder partial minicell is a CPS-Packet header.
Claim 13
Dependent Claim
12 words
The method of claim 11 wherein the CPS-Packet header comprise three octets.
Claim 14
Dependent Claim
29 words
The method of claim 11 wherein the CPS-Packet header allow a first partial minicell and a remainder partial minicell to be fragmented again before arriving at a destination node.
Claim 15
Dependent Claim
32 words
The method of claim 13 wherein the CPS-Packet header further comprises a user-to-user interface, the user-to-user interface informing a destination node of a beginning and a end of the remainder partial minicell.
Claim 16
Dependent Claim
19 words
The method of claim 14 wherein the user-to-user interface provides for a correct reassembly of a variable size minicell.
Claim 17
Dependent Claim
27 words
The method of claim 1 further comprising the step of determining whether a minicell is a complete minicell, a first partial minicell or a remainder partial minicell.
Claim 18
Dependent Claim
30 words
The method of claim 16 wherein the step of determining further comprises the step of comparing the identification code of a Partial minicell with entries in a identification code table.
Claim 19
Dependent Claim
16 words
The method of claim 17 wherein the identification code table is a channel identifier code table.
Claim 20
Dependent Claim
31 words
The method of claim 18 wherein the step of comparing further comprises the step of identifying a size received field in the identifier code table in the channel identifier code table.
Claim 21
Dependent Claim
15 words
The method of claim 19 wherein the size received field is identified as being zero.
Claim 22
Dependent Claim
29 words
The method of claim 20 further comprising the step of comparing a length field in the identification code with a packet size field in the channel identifier code table.
Claim 23
Dependent Claim
39 words
The method of claim 21 further comprising the step of identifying a minicell as a complete minicell when the length field in the identification code is the same as the packet size field in the channel identifier code table.
Claim 24
Dependent Claim
41 words
The method of claim 22 further comprising the step of identifying a minicell as a first partial minicell when the length field in the identification code is not the same as the packet size field in the channel identifier code table.
Claim 25
Dependent Claim
30 words
The method of claim 22 further comprising the steps of extracting a length indicator from the identification code and updating the size received field in the channel identifier code table.
Claim 26
Dependent Claim
15 words
The method of claim 19 wherein the size received field is identified as being non-zero.
Claim 27
Dependent Claim
23 words
The method of claim 25 wherein the minicell is a remainder partial minicell when the size received field is identified as being non-zero.
Claim 28
Dependent Claim
32 words
The method of claim 26 further comprising the steps of: subtracting a value in the size received field in the channel identifier code table from a entry in the packet size field.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 2005-09-09 | 2006-03-11 | 2006-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2009-09-09 | 2010-03-11 | 2010-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2013-09-09 | 2014-03-11 | 2014-09-10 | $7700.00 | Window Closed / Lapsed |