EP1198930A1 - Method of determining cell loss priority information - Google Patents
Method of determining cell loss priority informationInfo
- Publication number
- EP1198930A1 EP1198930A1 EP00963864A EP00963864A EP1198930A1 EP 1198930 A1 EP1198930 A1 EP 1198930A1 EP 00963864 A EP00963864 A EP 00963864A EP 00963864 A EP00963864 A EP 00963864A EP 1198930 A1 EP1198930 A1 EP 1198930A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cell
- priority information
- loss priority
- atm
- gfr
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/04—Selecting arrangements for multiplex systems for time-division multiplexing
- H04Q11/0428—Integrated services digital network, i.e. systems for transmission of different types of digitised signals, e.g. speech, data, telecentral, television signals
- H04Q11/0478—Provisions for broadband connections
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/54—Store-and-forward switching systems
- H04L12/56—Packet switching systems
- H04L12/5601—Transfer mode dependent, e.g. ATM
- H04L2012/5625—Operations, administration and maintenance [OAM]
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/54—Store-and-forward switching systems
- H04L12/56—Packet switching systems
- H04L12/5601—Transfer mode dependent, e.g. ATM
- H04L2012/5638—Services, e.g. multimedia, GOS, QOS
- H04L2012/5646—Cell characteristics, e.g. loss, delay, jitter, sequence integrity
- H04L2012/5647—Cell loss
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/54—Store-and-forward switching systems
- H04L12/56—Packet switching systems
- H04L12/5601—Transfer mode dependent, e.g. ATM
- H04L2012/5638—Services, e.g. multimedia, GOS, QOS
- H04L2012/5646—Cell characteristics, e.g. loss, delay, jitter, sequence integrity
- H04L2012/5651—Priority, marking, classes
Definitions
- ATM communication networks operating according to the Asynchronous Transfer Mode (ATM)
- ATM communication networks operating according to the Asynchronous Transfer Mode (ATM)
- ATM communication networks there are different ways of monitoring variable and fixed and guaranteed transmission rates of ATM cells or ATM cells belonging to a frame or transmission frame Monitoring strategies are provided for monitoring the data traffic.
- loss priorities are assigned to the transmitted ATM cells, and the loss priorities are used, among other things, to determine the
- Transfer of the respective ATM cell decided in a communication device With the help of a monitoring procedure, a decision is made based on the assigned loss priorities, in particular on the forwarding or rejection of an ATM cell in the respective communication device.
- the cell-specific assignment of loss priorities thus determines which ATM cells can be discarded in the event of an overload situation within the ATM communication network without the loss of real-time, connection-specific information.
- CBR constant bit rate
- VBR variable bit rate
- ABR available bit rate
- URR unspecified bit rate
- GFR guaranteed frame Rate
- the constant bit rate connection type is used for virtual connections for which, in the period of existence of the virtual current connection, a specified transmission bandwidth must always be provided.
- variable bit rate connection type is defined for virtual connections with variable or variable transmission rate requirements in the "Traffic Management 4.1" proposal of the ATM Forum 1999.
- the available bit rate connection type enables applications to which no special transmission bandwidth is assigned.
- the applications can use the transmission bandwidth currently possible in the ATM communication network, a maximum and a minimum transmission rate being assigned to the respective available bit rate connection and these limit values must not be exceeded or undershot.
- Unspecified Bit Rate connection type With the Unspecified Bit Rate connection type, no specified cell loss information or cell delay times are assigned to the respective virtual connection. Rather, the unspecified bit rate connection type sets one
- the guaranteed frame rate connection type is intended to support delay-tolerant applications that are guaranteed low transmission bandwidth and that can be allocated additional transmission capacity that is freed up during the traffic volume.
- the information of a frame is packaged in ATM cells and all ATM cells of a frame are given the same loss priority or cell loss priority information with the aid of the cell loss priority bit (CLP bit ) assigned, ie in the cell header or header of the ATM cell, the CLP bit provided for overload control in ATM communication systems assumes the same value for the ATM cells of a frame of a virtual guaranteed frame rate connection. If, for example, an overload occurs in a network node or an ATM communication device, then all the ATM cells belonging to a frame can be rejected by the overload control of the network node or the ATM communication device.
- CLP bit cell loss priority bit
- ATM cells or control cells intended exclusively for this purpose provided.
- Such ATM cells are referred to as "Operation Administration Maintenance” (OAM) cells and “Resource Management ent” (RM) cells. They can be inserted into the continuous ATM cell stream both by the ATM communication terminals and by ATM communication devices.
- OAM Operaation Administration Maintenance
- RM Resource Management ent
- the object on which the invention is based is to ensure the "Quality of Service” when inserting operational, maintenance, administrative and resource management ent cells.
- the object is solved by the features of claim 1.
- the essential aspect of the method according to the invention is to be seen in the fact that for determining the cell loss priority information in operational, maintenance, administrative and / or resource management cells, the cells between a virtual connection with a guaranteed frame transmission rate (guaranteed frame Rate) can be inserted within an ATM communication system and / or an ATM communication terminal, the cell loss priority information of the cell of the respective virtual connection to be transmitted is determined and incorporated into the operational, maintenance, administrative and / or resource management Cell is inserted as current cell loss priority information.
- a guaranteed frame transmission rate guaranteed frame Rate
- different loss priorities are assigned to the respective cell by the cell loss priority information - claim 2 - and the cell loss priority information is formed by information comprising one bit - claim 3.
- the assignment of different loss priorities with the aid of the Cell loss priority information and the formation of one bit of information is coordinated with the "Traffic Management Specification 4.1" proposal of the ATM Forum 1999.
- the operational, maintenance, administrative and resource management cells are standard operation administration maintenance (OAM) cells and resource management (RM) cells ITU-T 1.610 and ITU-T 1.371 designed - claim 4.
- OFAM operation administration maintenance
- RM resource management
- a further essential advantage of the method according to the invention is to be seen in the fact that when a cell of the virtual connection that is to be transmitted directly is not available, a predetermined standard cell loss priority information is entered into the operational, maintenance, technical and / or resource management cell is inserted as the current cell loss priority information — claim 5.
- the logical value “0” is advantageously assumed by the standard cell loss priority information represented by the CLP bit, that is, by default, due to the CLP bits having the logical value “0”, the ATM Cell This ATM cell is only likely to be rejected if an overload situation occurs, for example within an ATM communication device.
- the cell loss priority information of the cell to be transmitted immediately of the following frame becomes the virtual one Connection determined and inserted into the operational maintenance management technical and / or resource management cell as current cell loss priority information - claim 6.
- an ATM communication device ATM-KE operating according to the asynchronous transfer mode is shown schematically, to which a plurality of feeder lines El to En and a plurality of customer lines AI to An are connected with the aid of connection units AE.
- the feeder lines El to En and the customer lines AI to An and one of several possible connection units AE are shown by way of example in FIG. 1.
- ATM cells DPx are transmitted via virtual connections according to the asynchronous transfer mode, variable, fixed or guaranteed transmission rates being provided for the transmission of ATM cells DPx from virtual connections.
- a virtual GFR connection GFR-Vx is exemplified by a dashed line and its feeder line Ex or its customer line Ax.
- GFR guaranteed frame rate
- the information of one frame is packaged in ATM cells DPx and all ATM cells DPx one
- the same loss priority or cell loss priority information CLP is assigned to the frame using the cell loss priority bit (CLP bit).
- the connection unit AE has a plurality of treatment devices BHE, with each of the feeder lines El to En and the customer lines AI to An being assigned a treatment device BHE.
- the feeder treatment device BHEE which is associated with the virtual GFR connection GFR-Vx and which is connected to the feeder line Ex, is shown as an example in the block diagram according to FIG.
- the feeder treatment device BHEE of the connection unit AE is supplied with the ATM cells DPx transmitted in the virtual GFR connection GFR-Vx. Subsequently, the ATM cells DPx of the virtual GFR connection GFR-Vx are forwarded to a switching network KA of the ATM communication device ATM-KE, for the switching network KA in FIG.
- the ATM cells DPx of the virtual GFR connection GFR-Vx are forwarded from the coupling arrangement KA to the customer line Ax by a treatment device BHE connected to the customer lines AI to An.
- the treatment units BHE / BHEE are equipped with a storage unit PS and a microcontroller MC, the storage unit PS and the microcontroller MC of the feeder treatment unit BHEE of the virtual GFR connection GFR-Vx being shown by way of example in FIG.
- the ATM cell DPx of a frame of the virtual GFR connection GFR-Vx arrives in the ATM communication device ATM-KE
- the ATM cell DPx is forwarded to the feeder treatment device BHEE of the connection unit AE passes and cached there in the storage unit PS.
- a first and a second ATM cell DP1, DP2 of the virtual GFR connection GFR-Vx are buffered in the storage unit PS, the first ATM cell DPI before the second ATM cell DP2 being buffered in the storage unit PS and is therefore intended for direct transmission to the coupling arrangement KA.
- the ATM communication device ATM-KE provides for the insertion of an OAM or RM cell OAM into the cell stream of the virtual GFR connection GFR-Vx, it is assumed that an ATM-KE or is present in the feeder treatment device BHEE of the connection unit AE OAM and / or RM cell OAM.
- the ATM cell DPx to be transmitted directly of the virtual GFR connection GFR-Vx becomes the cell loss priority information CLP transmitted in the temporarily stored first ATM cell DPI with the help of the microcontroller MC within the framework of a Read cycle or copied and entered in the generated OAM and / or RM cell OAM and buffered in the memory unit PS.
- FIG. 1 shows, for example, an OAM cell OAM, into which the cell loss priority information CLP of the temporarily stored first ATM cell DPI is entered or copied with the aid of the microcontroller MC.
- the OAM and / or RM cell OAM modified in this way is inserted into the cell stream of the virtual GFR connection GFR-Vx, for example — as shown in FIG.
- the OAM and / or RM cell to be inserted OAM enters or copies standard cell loss priority information assuming the logical value "0".
- the inserted OAM cell OAM is transmitted to the switching network KA and switched there.
- the respective ATM cell DPx or the inserted OAM and / or RM cell OAM is conveyed to the treatment device BHE connected to the customer line Ax and forwarded to the customer line Ax by the treatment device BHE.
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Data Exchanges In Wide-Area Networks (AREA)
Abstract
Description
Claims
Applications Claiming Priority (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19935787 | 1999-07-29 | ||
DE19935787 | 1999-07-29 | ||
DE19937244A DE19937244B4 (en) | 1999-07-29 | 1999-08-06 | A method of determining cell loss priority information |
DE19937244 | 1999-08-06 | ||
PCT/DE2000/002521 WO2001010085A1 (en) | 1999-07-29 | 2000-07-31 | Method of determining cell loss priority information |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1198930A1 true EP1198930A1 (en) | 2002-04-24 |
Family
ID=26054403
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00963864A Withdrawn EP1198930A1 (en) | 1999-07-29 | 2000-07-31 | Method of determining cell loss priority information |
Country Status (4)
Country | Link |
---|---|
US (1) | US7151748B1 (en) |
EP (1) | EP1198930A1 (en) |
AU (1) | AU7504300A (en) |
WO (1) | WO2001010085A1 (en) |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3291875B2 (en) * | 1993-12-06 | 2002-06-17 | 株式会社日立製作所 | Policing circuit |
JPH09270804A (en) * | 1996-04-03 | 1997-10-14 | Toshiba Corp | Atm exchange |
US5966546A (en) * | 1996-09-12 | 1999-10-12 | Cabletron Systems, Inc. | Method and apparatus for performing TX raw cell status report frequency and interrupt frequency mitigation in a network node |
JP3011130B2 (en) * | 1996-10-11 | 2000-02-21 | 日本電気株式会社 | ATM signal switching device |
JP3607017B2 (en) * | 1996-10-31 | 2005-01-05 | 富士通株式会社 | Feedback control device and cell scheduling device in cell switch |
US5991265A (en) * | 1996-12-02 | 1999-11-23 | Conexant Systems, Inc. | Asynchronous transfer mode system and method |
US6246687B1 (en) * | 1997-03-27 | 2001-06-12 | Massachusetts Institute Of Technology | Network switching system supporting guaranteed data rates |
US6483839B1 (en) * | 1998-03-18 | 2002-11-19 | Conexant Systems, Inc. | Apparatus and method for scheduling multiple and simultaneous traffic in guaranteed frame rate in ATM communication system |
JP3650262B2 (en) * | 1998-03-20 | 2005-05-18 | 富士通株式会社 | Cell transfer rate control apparatus and method |
JP3474439B2 (en) * | 1998-05-08 | 2003-12-08 | 富士通株式会社 | Communication control device having ABR communication service function and ATM exchange having this communication control device |
JP2000059370A (en) * | 1998-08-04 | 2000-02-25 | Fujitsu Ltd | Device and method for controlling traffic |
-
2000
- 2000-07-31 US US10/048,014 patent/US7151748B1/en not_active Expired - Fee Related
- 2000-07-31 AU AU75043/00A patent/AU7504300A/en not_active Abandoned
- 2000-07-31 WO PCT/DE2000/002521 patent/WO2001010085A1/en active Application Filing
- 2000-07-31 EP EP00963864A patent/EP1198930A1/en not_active Withdrawn
Non-Patent Citations (1)
Title |
---|
See references of WO0110085A1 * |
Also Published As
Publication number | Publication date |
---|---|
US7151748B1 (en) | 2006-12-19 |
AU7504300A (en) | 2001-02-19 |
WO2001010085A1 (en) | 2001-02-08 |
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Legal Events
Date | Code | Title | Description |
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PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
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17P | Request for examination filed |
Effective date: 20020128 |
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AK | Designated contracting states |
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RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: NOKIA SIEMENS NETWORKS GMBH & CO. KG |
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RAP3 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: NOKIA SIEMENS NETWORKS S.P.A. |
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RAP3 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: NOKIA SIEMENS NETWORKS GMBH & CO. KG |
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GRAP | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOSNIGR1 |
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STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
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18D | Application deemed to be withdrawn |
Effective date: 20080610 |