WO2010017838A1 - Method and device for data processing via a generic framing procedure - Google Patents

Method and device for data processing via a generic framing procedure Download PDF

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Publication number
WO2010017838A1
WO2010017838A1 PCT/EP2008/060637 EP2008060637W WO2010017838A1 WO 2010017838 A1 WO2010017838 A1 WO 2010017838A1 EP 2008060637 W EP2008060637 W EP 2008060637W WO 2010017838 A1 WO2010017838 A1 WO 2010017838A1
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WO
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Patent type
Prior art keywords
gfp
method according
bandwidth information
channel
frame
Prior art date
Application number
PCT/EP2008/060637
Other languages
French (fr)
Inventor
Christian Magerle
Peter Weber
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Nokia Siemens Networks Oy
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04JMULTIPLEX COMMUNICATION
    • H04J3/00Time-division multiplex systems
    • H04J3/16Time-division multiplex systems in which the time allocation to individual channels within a transmission cycle is variable, e.g. to accommodate varying complexity of signals, to vary number of channels transmitted
    • H04J3/1605Fixed allocated frame structures
    • H04J3/1611Synchronous digital hierarchy [SDH] or SONET
    • H04J3/1617Synchronous digital hierarchy [SDH] or SONET carrying packets or ATM cells
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00Traffic regulation in packet switching networks
    • H04L47/10Flow control or congestion control

Abstract

A method and a device for data processing via a Generic Framing Procedure are provided, wherein a bandwidth information regarding at least one GFP channel is conveyed with a GFP frame. Furthermore, a communication system is suggested comprising said device.

Description

Description

Method and device for data processing via a Generic Framing Procedure

The invention relates to a method and to a device for data processing via a Generic Framing Procedure.

In transmission systems for telecommunication applications various approaches of wrapping and conveying data are utilized. One example is defined as Generic Framing Procedure (GFP) according to ITU-T Recommendation G.7041.

GFP is in particular used to wrap different, in particular packet-oriented data formats in an SDH frame or in an OTH frame. According to a transparent version of GFP (GFP-T), incoming data streams are evenly distributed into GFP-T packets. This results in a constant utilization of an available bandwidth depending on the user signal. According to a frame- based version of GFP (GFP-F) , the data packets are distributed among single GFP F packets, in particular each single data packet is assigned to a GFP-F packet.

GFP allows conveying several data streams via a single SDH or a single OTH stream. In such case, channel numbers are assigned to individual GFP packets.

It is also possible to mix various data streams on different sections of a path or connection. Fig.l shows a sequence of network elements NEO, NEl, NE2, NE3 and NE4, which are connected via SDH or OTH. GFP channels are conveyed within the SDH or OTH data streams. Said SDH or OTH data connections are totally terminated, thus GFP channels can be freely mixed at each network element. Each GFP channel may start or terminate at any network element. For example, according to Fig.l, GFP channel A starts at network element NEO and ends at network element NE3, GFP channel B starts at network element NEl and terminates at network element NE4, GFP channel C starts at network element NE2 and ends at network element NE4 and GFP channel D starts at network element NEO and terminates at network element NE2. For each GFP channel a corresponding channel may exist in opposite direction.

GFP channels convey type of data information in a data frame. However, setting up a GFP channel requires to observe a bandwidth limitation for the sum of all GFP channels. With GFP channels being only point-to-point connections, this task is relatively easy to meet. However, in case several sections of a path are combined by overlapping GFP channels (as, e.g., shown in Fig.l) the task gets more complicated and the overall bandwidth limitation requirement is difficult to meet.

Disadvantageously, GFP does not support any means that help adjusting and/or fulfilling the bandwidth limitation requirement on a dynamic basis.

The problem to be solved is to overcome the disadvantages set forth above and in particular to allow GFP channels to cope with an overall bandwidth limitation requirement even if complex overlapping GFP channels are mixed throughout a network.

This problem is solved according to the features of the inde- pendent claims. Further embodiments result from the depending claims .

In order to overcome this problem, a method for data processing via a Generic Framing Procedure (GFP) is provided, wherein a bandwidth information regarding at least one GFP channel is conveyed with a GFP frame.

It is noted that said GFP is based on a definition set forth in ITU-T Recommendation G.7041. However, the approach sug- gested herein extends said standard in a way to efficiently utilize conveying bandwidth information regarding at least one GFP channel. In particular, all GFP channels may carry information regarding their respective bandwidth. It is further noted that the bandwidth information mentioned may refer to any such information directly or derived from another information. For example, bandwidth information may also comprise any data rate information.

Thus, the approach presented allows providing information regarding the data rate with the GFP channel. The GFP information conveyed may indicate that a fiber channel signal is conveyed at a data rate of, e.g., 1.0625 GBit/s, 2.125 GBit/s or of 4.25 GBit/s.

This approach thus allows monitoring, supervising and surveillance of an actual data rate applied to the GFP channels thereby avoiding any signal interruptions due to misconfigu- ration. In other words, bandwidths can be adjusted pursuant to such monitoring. This in particular applies to scenarios comprising several (overlapping) GFP channels with different data rates.

The approach provided herein is applicable for GFP-T as well as for GFP-F.

In an embodiment, the GFP frame comprises or is associated with a GFP data frame and/or a GFP client management frame.

In another embodiment, the bandwidth information of each GFP channel is conveyed with the GFP frame of said GFP channel.

In a further embodiment, an extension header identifier (EXI) of the GFP frame is utilized for conveying said bandwidth information .

In a next embodiment, an extension header type is introduced for conveying said bandwidth information, said extension header type in particular comprising a channel data rate field. It is also an embodiment that said bandwidth information is processed in particular by a management component or by a management function.

Thus, a monitoring, surveillance or management function may utilize the bandwidth information to trigger further activities thereon.

Pursuant to another embodiment, a GFP channel is suppressed in case of a discrepancy between the bandwidth information conveyed and a bandwidth information set by configuration.

The problem stated above is also solved by a device comprising a and/or being associated with a processor unit and/or a hard-wired circuit and/or a logic device that is arranged such that the method as described herein is executable on said processor unit.

According to an embodiment, the device is a communication de- vice, in particular a or being associated with a network component or any element within a network starting and/or terminating GFP traffic.

The problem stated supra is further solved by a communication system comprising the device as described herein.

Embodiments of the invention are shown and illustrated in the following figures:

Fig.2 shows an adapted GFP frame structure for a GFP data frame and for a GFP client management frame;

Fig.3 shows a type-field of a standard type GFP header;

Fig.4 shows a series of network elements with overlapping GFP channels of different bandwidths, wherein a GFP channel D has been wrongly configured thereby interfering with GFP channels A and B; Fig.5 shows the series of network elements according to

Fig.4, wherein the GFP channel D is interrupted by a management function in order to avoid interfering with GFP channels A and B.

This approach in particular is based on the GFP standard as defined in ITU-T G.7041. This GFP is extended as suggested herein in particular to provide monitoring and surveillance functionality regarding bandwidth and/or data rate information .

GFP allows according to ITU-T G.7041 an extension header identifier (EXI) parameter to be used to select the type of extension header. This EXI parameter is utilized herein to convey additional information in an overhead portion of each data frame.

The EXI parameter is a 4bit field allowing 16 different val- ues to be assigned, wherein ITU-T G.7041 yet only uses 3 values. The remaining 13 values are labeled "reserved".

This approach in particular defines an extension header type by introducing an according value for the EXI parameter. This extension header type is utilized for supplementing bandwidth information. Advantageously, the extension header type for the EXI parameter is selected such that there is no collision with upcoming changes of the standard.

Fig.2 shows as how a GFP frame structure for a GFP data frame as well as for the GFP client management frame may be adapted to convey the bandwidth information.

The core header corresponds to the definition set forth in standard ITU-T G.7041. The standard type field as shown in

Fig.3 corresponds to the structure as defined in ITU-T G.7041 comprising the fields Payload Type Identifier (PTI), Payload FCS Identifier (PFI), Extension Header Identifier (EXI) and User Payload Identifier (UPI) .

The Extended Linear Extension Header comprises unlike the Linear Extension Header according to ITU-T G.7041 an additional field comprising a Channel Data Rate (CDR) . This additional field CDR results in an adaptation of the length of the Extension Header compared to the yet defined Linear Extension Header. This is in particular possible as an addi- tional 4 bytes per GFP frame are without significant impact on a maximum data rate.

Advantageously, a Channel ID (CID) and an extended HEC (eHEC) are used as suggested by ITU-T G.7041. Utilizing eHEC allows for supervision and error correction of the Extended Linear Extension Header.

The remaining portion of the GFP packet comprising in particular payload data and a frame check sequence may remain unchanged and/or correspond to the specification set forth in ITU-T G.7041. This maintains the protection mechanisms set forth in the standard.

The CDR block is used to convey bandwidth information. Ac- cording to Fig.2, the data rate may be indicated at an accuracy of 1 Mbit/s.

The approach is not limited to this particular adaptation of the GFP frame. It is rather directed to the possibility con- veying data rate or bandwidth information with the GFP data.

The bandwidth information can be provided at the start of the GFP channel with the GFP frame. In each network element, such bandwidth information can be obtained and evaluated. Several approaches of evaluation are possible, e.g.:

(a) The information received is compared to an expected channel-specific bandwidth (that may be set by configu- ration) . In case of discrepancy, the GFP signal can be suppressed, because of an assumed misconfiguration . By suppressing a wrongly configured signal interference of the other channels can be avoided. In addition, an alarm event or a notification towards a management system can be launched.

(b) The information received is compared to the maximum bandwidth for the particular channel (set by configura- tion) . In case the received bandwidth exceeds the configuration, the GFP signal can be suppressed. This avoids interfering with other channels that may be correctly configured. In addition, an alarm event may be sent to the management system. In case the received bandwidth falls short of the configuration, no alarm event has to be triggered. Such shortfall is admissible and may even be a suitable technique reserving bandwidth for future usage.

(c) The bandwidth information received can be used for evaluation purposes in order to determine an amount of available bandwidth for the particular transmission line .

Further Advantages:

The approach provided avoids misconfigurations that may result in interruptions of the transmission. In particular, channels that are wrongly configured can be selectively switched off thereby avoiding any undesired impact or interference of such channels to/with the remaining channels. Thus, it can in particular be prevented that one misconfig- ured channel affects all other (otherwise properly working) channels .

Regarding a scenario with mixed GFP channels, i.e. GFP channels with different starting points and termination points as shown in Fig.l, channel-specific bandwidth transmission gains in importance. This is in particular decisive and complex for channels of different data rates. Hence, the approach provided allows an upper management system to monitor the data rates of the different GFP channels.

Fig.4 shows a scenario based on Fig.l with a misconfiguration of the bandwidth for GFP channel D in the network element NEl resulting in an interference with channels A and B in the section from network element NEl to network element NE2. An exemplary solution is depicted in Fig.5. Suppressing said GFP channel D avoids any disturbance of GFP channels A and B in said section between network elements NEl and NE2.

List of Abbreviations:

CDR Channel Data Rate cHEC HEC for core header CID Channel ID eHEC HEC for extension header

EXI Extension Header Identifier

FCS Frame Checking Sequence

GFP Generic Framing Procedure GFP-F frame-based GFP

GFP-T transparent GFP

HEC Header Error Check

OTH Optical Transport Hierarchy

PFI Payload FCS Indicator PLI Payload Length Indicator

PTI Payload Type Identifier

SDH Synchronous Digital Hierarchy tHEC HEC for type header

UPI User Payload Identifier

Claims

Claims :
1. A method for data processing via a Generic Framing Procedure, wherein a bandwidth information regarding at least one GFP channel is conveyed with a GFP frame.
2. The method according to claim 1, wherein the bandwidth information comprises a data rate information.
3. The method according to any of the preceding claims, wherein the GFP frame comprises or is associated with a GFP data frame and/or a GFP client management frame.
4. The method according to any of the preceding claims, wherein the bandwidth information of each GFP channel is conveyed with the GFP frame of said GFP channel.
5. The method according to any of the preceding claims, wherein an extension header identifier of the GFP frame is utilized for conveying said bandwidth information.
6. The method according to any of the preceding claims, wherein an extension header type is introduced for conveying said bandwidth information, said extension header type in particular comprising a channel data rate field.
7. The method according to any of the preceding claims, wherein said bandwidth information is processed in particular by a management component or by a management function.
8. The method according to claim 7, wherein a GFP channel is suppressed in case of a discrepancy between the bandwidth information conveyed and a bandwidth information set by configuration.
9. The method according to any of the preceding claims, wherein said Generic Framing Procedure comprises GFP-T and/or GFP-F.
10. A device comprising a and/or being associated with a processor unit and/or a hard-wired circuit and/or a logic device that is arranged such that the method according to any of the preceding claims is executable thereon .
11. The device according to claim 10, wherein said device is a communication device, in particular a or being associated with a network component.
12. Communication system comprising the device according to any of claims 10 or 11.
PCT/EP2008/060637 2008-08-13 2008-08-13 Method and device for data processing via a generic framing procedure WO2010017838A1 (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011106974A1 (en) * 2010-03-04 2011-09-09 中兴通讯股份有限公司 Bandwidth adjustment method and system for flexible optical channel data unit based on generic framing procedure
WO2012088994A1 (en) * 2010-12-27 2012-07-05 中兴通讯股份有限公司 Method and system for establishing connection
WO2016074484A1 (en) * 2014-11-10 2016-05-19 中兴通讯股份有限公司 Method and apparatus for sending packet service signal, and receiving method and apparatus
US9825696B2 (en) 2016-01-13 2017-11-21 Ciena Corporation Ethernet link state signaling for packet flows mapped into optical transport network with generic framing procedure

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US20020083190A1 (en) * 2000-12-26 2002-06-27 Satoshi Kamiya Apparatus and method for GFP frame transfer
US20040013129A1 (en) * 2001-08-07 2004-01-22 Xiaojun Fang Method and protocol for packetized optical channel based on digital wrapper
US20040085904A1 (en) * 2002-10-31 2004-05-06 Bordogna Mark A. Method for flow control of packets aggregated from multiple logical ports over a transport link
US20060002304A1 (en) * 2004-06-30 2006-01-05 Nortel Networks Limited Method and apparatus for implementing link-based source routing in generic framing protocol

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20020083190A1 (en) * 2000-12-26 2002-06-27 Satoshi Kamiya Apparatus and method for GFP frame transfer
US20040013129A1 (en) * 2001-08-07 2004-01-22 Xiaojun Fang Method and protocol for packetized optical channel based on digital wrapper
US20040085904A1 (en) * 2002-10-31 2004-05-06 Bordogna Mark A. Method for flow control of packets aggregated from multiple logical ports over a transport link
US20060002304A1 (en) * 2004-06-30 2006-01-05 Nortel Networks Limited Method and apparatus for implementing link-based source routing in generic framing protocol

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"Generic framing procedure (GFP); G.7041/Y.1303 (08/05)" ITU-T STANDARD IN FORCE (I), INTERNATIONAL TELECOMMUNICATION UNION, GENEVA, CH, no. G.7041/Y.1303 (08/05, 22 August 2005 (2005-08-22), XP017404569 cited in the application *

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011106974A1 (en) * 2010-03-04 2011-09-09 中兴通讯股份有限公司 Bandwidth adjustment method and system for flexible optical channel data unit based on generic framing procedure
CN102195859A (en) * 2010-03-04 2011-09-21 中兴通讯股份有限公司 Method and system for adjusting bandwidth of optical channel data unit flexible (ODUflex) based on GFP (Generic Framing Procedure)
US8971333B2 (en) 2010-03-04 2015-03-03 Zte Corporation Bandwidth adjustment method and system for optical channel data unit flexible based on generic framing procedure
CN102195859B (en) * 2010-03-04 2015-05-06 中兴通讯股份有限公司 Method and system for adjusting bandwidth of optical channel data unit flexible (ODUflex) based on GFP (Generic Framing Procedure)
WO2012088994A1 (en) * 2010-12-27 2012-07-05 中兴通讯股份有限公司 Method and system for establishing connection
WO2016074484A1 (en) * 2014-11-10 2016-05-19 中兴通讯股份有限公司 Method and apparatus for sending packet service signal, and receiving method and apparatus
US9825696B2 (en) 2016-01-13 2017-11-21 Ciena Corporation Ethernet link state signaling for packet flows mapped into optical transport network with generic framing procedure

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