WO2002017543A2 - System and method of mapping fixed-size data packets and variable-size data packets over sonet and sdh - Google Patents

System and method of mapping fixed-size data packets and variable-size data packets over sonet and sdh Download PDF

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Publication number
WO2002017543A2
WO2002017543A2 PCT/US2001/026534 US0126534W WO0217543A2 WO 2002017543 A2 WO2002017543 A2 WO 2002017543A2 US 0126534 W US0126534 W US 0126534W WO 0217543 A2 WO0217543 A2 WO 0217543A2
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WO
WIPO (PCT)
Prior art keywords
mapping
data packets
size data
sdh
superframe
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Application number
PCT/US2001/026534
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French (fr)
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WO2002017543A3 (en
Inventor
Lee Gordon
Kevin Huang
Chen Wen-Lung
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Geyser Networks, Inc.
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Priority to AU2001288397A priority Critical patent/AU2001288397A1/en
Publication of WO2002017543A2 publication Critical patent/WO2002017543A2/en
Publication of WO2002017543A3 publication Critical patent/WO2002017543A3/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L49/00—Packet switching elements
    • H04L49/60—Software-defined switches
    • H04L49/606—Hybrid ATM switches, e.g. ATM&STM, ATM&Frame Relay or ATM&IP
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/64—Hybrid switching systems
    • H04L12/6418—Hybrid transport
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00—Routing or path finding of packets in data switching networks
    • H04L45/50—Routing or path finding of packets in data switching networks using label swapping, e.g. multi-protocol label switch [MPLS]
    • 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
    • H04J—MULTIPLEX COMMUNICATION
    • H04J2203/00—Aspects of optical multiplex systems other than those covered by H04J14/05 and H04J14/07
    • H04J2203/0001—Provisions for broadband connections in integrated services digital network using frames of the Optical Transport Network [OTN] or using synchronous transfer mode [STM], e.g. SONET, SDH
    • H04J2203/0003—Switching fabrics, e.g. transport network, control network
    • H04J2203/0005—Switching elements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J2203/00—Aspects of optical multiplex systems other than those covered by H04J14/05 and H04J14/07
    • H04J2203/0001—Provisions for broadband connections in integrated services digital network using frames of the Optical Transport Network [OTN] or using synchronous transfer mode [STM], e.g. SONET, SDH
    • H04J2203/0003—Switching fabrics, e.g. transport network, control network
    • H04J2203/0005—Switching elements
    • H04J2203/0008—Time switch details
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J2203/00—Aspects of optical multiplex systems other than those covered by H04J14/05 and H04J14/07
    • H04J2203/0001—Provisions for broadband connections in integrated services digital network using frames of the Optical Transport Network [OTN] or using synchronous transfer mode [STM], e.g. SONET, SDH
    • H04J2203/0028—Local loop
    • H04J2203/0039—Topology
    • H04J2203/0041—Star, e.g. cross-connect, concentrator, subscriber group equipment, remote electronics
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J2203/00—Aspects of optical multiplex systems other than those covered by H04J14/05 and H04J14/07
    • H04J2203/0001—Provisions for broadband connections in integrated services digital network using frames of the Optical Transport Network [OTN] or using synchronous transfer mode [STM], e.g. SONET, SDH
    • H04J2203/0073—Services, e.g. multimedia, GOS, QOS
    • H04J2203/0075—Connection-oriented
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J2203/00—Aspects of optical multiplex systems other than those covered by H04J14/05 and H04J14/07
    • H04J2203/0001—Provisions for broadband connections in integrated services digital network using frames of the Optical Transport Network [OTN] or using synchronous transfer mode [STM], e.g. SONET, SDH
    • H04J2203/0073—Services, e.g. multimedia, GOS, QOS
    • H04J2203/0082—Interaction of SDH with non-ATM protocols
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/64—Hybrid switching systems
    • H04L12/6418—Hybrid transport
    • H04L2012/6424—Access arrangements

Definitions

  • the present invention relates to optical networking. More particularly, the invention relates to a system and method of mapping fixed- size data packets and variable-size data packets over SONET and SDH.
  • ATM cells are only byte-boundary aligned and are not ATM cell boundary aligned.
  • ATM cells are delineated at the ATM layer, which is a very inefficient process.
  • ATM cells are carried within a SONET payload envelope without aligning to any boundary in the SONET frame. Instead, ATM cells are only byte aligned by traditional ATM mapping at the ATM layer. This creates the need to delineate ATM cells at the other end of the SONET transport at the ATM layer, which increases the difficulty and complexity of implementation.
  • the present invention provides a system and method of mapping fixed-size data packets and variable-size data packets over SONET and SDH.
  • the system and method of mapping fixed-size data packets over SONET and SDH includes (1) buffering ATM cells and (2) mapping the ATM cells in a nxVT superframe.
  • the mapping includes mapping four ATM cells per NT in the nxNT superframe.
  • the mapping includes mapping 4n ATM cells in a sequence of byte flow in the nxNT superframe, where n is a positive integer.
  • the system and method of mapping variable-size data packets over SONET and SDH includes (1) encapsulating the packets in High-Level Data Link Control (HDLC) frames and (2) mapping the HDLC frames in a nxVT superframe.
  • HDLC High-Level Data Link Control
  • Figure 1 illustrates prior art byte boundary alignment for ATM cells in standard SONET and SDH.
  • a dynamic bandwidth allocation (DBA) protocol which is described in co-pending and commonly assigned U.S. Patent Application No. (Number to be assigned) with Attorney Docket Number 55369-015, allows for dynamically changing the throughput of all nxVT connections, based on the real-time traffic loads of applications using the nxVT connections.
  • the DBA protocol allows for the efficient use of the SONET/SDH bandwidth through statistical multiplexing.
  • the same dynamic bandwidth allocation protocol applies to nxSTS-1 and nxAU- 3/nxAU-4.
  • the virtual concatenation invention provides for virtual concatenation, which includes creating a logical connection or pipe by combining multiple, n (where n is a positive integer), STS-1 or NT connections or pipes, which may be contiguous or non-contiguous, into a single connection or pipe, nxSTS-1 or nxNT, respectively, in order to support a connection or pipe with a higher throughput than the throughput of the original STS-1 or VT pipes.
  • the present invention provides a multi-service convergence sub-layer (MSCS) which is capable of transporting fixed-size data packets (ATM cells), and variable-size data packets (IP/FrameRelay/Ethernet frames) over a SONET and SDH network.
  • MSCS multi-service convergence sub-layer
  • Superframe 210 also known as a nxNT superframe, is further described in co-pending and commonly assigned U.S. Patent Application No. (Number to be assigned) with Attorney Docket Number 55369-014.
  • a packet is encapsulated in an HDLC frame directly, and the HDLC frame is mapped to a nxVT frame with byte alignment.
  • ATM cells are carried within a SONET payload envelope without aligning to any boundary in the SONET frame. Instead, ATM cells are only byte aligned by traditional ATM mapping at the ATM layer. This creates the need to delineate ATM cells at the other end of the SONET transport at the ATM layer, which increases the difficulty and complexity of implementation.
  • the present invention's auto-alignment technique for carrying ATM cells within a SONET payload envelope removes the need for ATM cell delineation, and, thereby, reduces the probability of cell loss and cell mis- insertion.
  • IP/FrameRelay/Ether Frames within one unifying structure over nxVT, thereby enabling multi-service transport support over SONET and SDH.
  • the present invention 's (1) auto-alignment technique for fixed-size packet and (2) packet direct mapping through DHLC to nxVT for variable- size packets, simplifies the de-capsulation of payload information.
  • the present invention can scale very well as the speed of a network increases..

Abstract

A system and method of mapping fixed-size data packets and variable-size data packets over SONET and SDH is provided. The system and method of mapping fixed-size data packets over SONET and SDH includes buffering ATM cells (230) and mapping the ATM cells in a nxVT superframe (210). In a further embodiment, the mapping includes mapping four ATM cells per VT in the nxVT superframe (210). In a further embodiment, the mapping includes mapping 4n ATM cells in a sequence of byte flow in the nxVT superframe (210), where n is a positive integer. The system and method of mapping variable-size data packets over SONET and SDH includes encapsulating the packets in High-Level Data Link Control (HDLC) frames and mapping the HDLC frames in a nxVT superframe.

Description

SYSTEM AND METHOD OF MAPPING FIXED-SIZE DATA PACKETS AND VARIABLE-SIZE DATA PACKETS OVER SONET
AND SDH
SPECIFICATION RELATED APPLICATIONS This application is related to U.S. Provisional Application No.
60/228,008, filed on August 23, 2000, to U.S. Provisional Application No. 60/272,793 , filed on March 1, 2001, to co-pending and commonly assigned U.S. Patent Application No. (Number to be assigned) with Attorney Docket Number 55369-014, filed on August 23, 2001, and to co-pending and commonly assigned U.S. Patent Application No. (Number to be assigned) with Attorney Docket Number 55369-015, filed on August 23, 2001. The contents of U.S. Provisional Application No. 60/228,008, filed on August 23,
2000, of U.S. Provisional Application No. 60/272,793, filed on March 1,
2001, of co-pending and commonly assigned U.S. Patent Application No. (Number to be assigned) with Attorney Docket Number 55369-014, filed on
August 23, 2001, and of co-pending and commonly assigned U.S. Patent Application No. (Number to be assigned) with Attorney Docket Number 55369-015, filed on August 23, 2001, are hereby incorporated by reference.
MPK42612-1.055369.00235 J This application claims priority to U.S. Provisional Application No. 60/228,008, filed on August 23, 2000, and to U.S. Provisional Application No. 60/272,793, filed on March 1, 2001.
FIELD OF THE INVENTION
The present invention relates to optical networking. More particularly, the invention relates to a system and method of mapping fixed- size data packets and variable-size data packets over SONET and SDH.
BACKGROUND OF THE INVENTION
Both SONET (See Synchronous Optical Network (SONET) Transport Systems: Common Generic Criteria. GR-253-CORE, Issue 2, Revision 1. December, 1997.) and SDH (See International Telecommunication Union. Network Node Interface for the Synchronous Digital Hierarchy. Recommendation G.707. March, 1996.) enable the use of virtual concatenation to support both the dynamic resizing of transport trunks and the grooming of traffic. More recently, advances in the transport of routed datagram traffic leveraging the research and experience of ATM has resulted in the standardization of MPLS (See Internet Engineering Task Force. Multiprotocol Label Switching Architecture. IETF Draft Document. August, 1999 and ht1p://www.ietf.org/internet-drafts/draft-ietf-mpls-arch- 06.txt.). This work allows network devices to employ a standards-based method by which packet traffic can traverse a network, while receiving a previously agreed upon Quality of Service. Referring to prior art Figure 1, in standard, prior art SONET and
SDH, ATM cells are only byte-boundary aligned and are not ATM cell boundary aligned. In other words, in standard SONET and SDH, ATM cells are delineated at the ATM layer, which is a very inefficient process. Traditionally, ATM cells are carried within a SONET payload envelope without aligning to any boundary in the SONET frame. Instead, ATM cells are only byte aligned by traditional ATM mapping at the ATM layer. This creates the need to delineate ATM cells at the other end of the SONET transport at the ATM layer, which increases the difficulty and complexity of implementation.
SUMMARY OF THE INVENTION The present invention provides a system and method of mapping fixed-size data packets and variable-size data packets over SONET and SDH. The system and method of mapping fixed-size data packets over SONET and SDH includes (1) buffering ATM cells and (2) mapping the ATM cells in a nxVT superframe. In a further embodiment, the mapping includes mapping four ATM cells per NT in the nxNT superframe. In a further embodiment, the mapping includes mapping 4n ATM cells in a sequence of byte flow in the nxNT superframe, where n is a positive integer.
The system and method of mapping variable-size data packets over SONET and SDH includes (1) encapsulating the packets in High-Level Data Link Control (HDLC) frames and (2) mapping the HDLC frames in a nxVT superframe.
BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 illustrates prior art byte boundary alignment for ATM cells in standard SONET and SDH.
Figure 2 depicts an STS-1 Super-Frame format and slot numbering scheme in accordance with an exemplary embodiment of the present invention.
DETAILED DESCRIPTION OF THE INVENTION
Introduction
The invention described in co-pending and commonly assigned U.S. Patent Application No. (Number to be assigned) with Attorney Docket Number 55369-014 provides a system and method of virtually concatenating VTl .5s and STS-ls over SONET and SDH and WDM. The virtual concatenation invention allows users to setup connections or pipes with configurable bandwidth over either nxSTS-l/nxAU-3/nxAU-4 or nxVT1.5/nxTU-l l/nxTU-12 within a nxSTS-l/nxAU-3/nxAU-4 pipe on an existing SONET/SDH network. This provides a connection or pipe of adjustable bandwidth with a granularity of close to 1.5 Mbps to fit the needs of applications. The resulting connection can be treated as a TDM like connection. By replacing "STS-1 " with "AU-3" or "AU-4" and "NT" or "NT1.5" with "TU-11" or "TU-12", the virtual concatenation invention applies to nxAU-3/nxAU-4 and nxTU-1 l/nxTU-12 for SDH networks. For simplicity, these connections are called "nxNT" for both SONET and SDH networks. By replacing "STS-1" with "NT" or "NT1.5", the virtual concatenation invention applies to nxSTS-1 and nxAU-3/nxAU-4.
On top of the virtual concatenation invention, a dynamic bandwidth allocation (DBA) protocol, which is described in co-pending and commonly assigned U.S. Patent Application No. (Number to be assigned) with Attorney Docket Number 55369-015, allows for dynamically changing the throughput of all nxVT connections, based on the real-time traffic loads of applications using the nxVT connections. The DBA protocol allows for the efficient use of the SONET/SDH bandwidth through statistical multiplexing. The same dynamic bandwidth allocation protocol applies to nxSTS-1 and nxAU- 3/nxAU-4. The virtual concatenation invention provides for virtual concatenation, which includes creating a logical connection or pipe by combining multiple, n (where n is a positive integer), STS-1 or NT connections or pipes, which may be contiguous or non-contiguous, into a single connection or pipe, nxSTS-1 or nxNT, respectively, in order to support a connection or pipe with a higher throughput than the throughput of the original STS-1 or VT pipes.
The present invention provides a multi-service convergence sub-layer (MSCS) which is capable of transporting fixed-size data packets (ATM cells), and variable-size data packets (IP/FrameRelay/Ethernet frames) over a SONET and SDH network. The MSCS can seamlessly mix both categories of traffic mentioned above within one STS-1 payload envelope and beyond, with bandwidth from one NT- 1.5 to as much as OC-n. ATM Mapping General
Referring to Figure 2, the present invention provides for a MSCS 200 developed upon standard SONET payload envelope. As depicted in Figure 2, MSCS super-frame 210, also known as a nxNT superframe, is formed by concatenating 8 consecutive SONET STS-1 frames (or 2 consecutive multi- frames). Each super-frame 210 consists of 28 basic slots, where each basic slot occupies 54 words, with 32-bit long words, ) within super-frame 210. The bandwidth of one basic slot is equivalent to one NT-1.5 defined by SONET standards. Multiple slots can be merged into one bigger slot for applications requiring bandwidth higher than NT-1.5. The number of basic slots that can be merged together is only limited by the total bandwidth of the SONET ring, not by the STS-1 framing boundary.
For each basic slot, the first word of the 54 words is called the PQUV word, which contains control information for dynamic bandwidth allocation. The remaining 53 words are for carrying payload information. For example, one NT 1.5 may have its control information stored in word 230 and have its payload stored in slotl[l] (slot 1, word 1) 240 to slotl[28] (slot 1, word 53) 242. For example, exactly 4 ATM cells can be mapped in the 53 information words of a slot. In this case, the ATM cell boundary is automatically aligned with the super-frame boundary in a convenient manner.
Superframe 210, also known as a nxNT superframe, is further described in co-pending and commonly assigned U.S. Patent Application No. (Number to be assigned) with Attorney Docket Number 55369-014. For variable-size packets, a packet is encapsulated in an HDLC frame directly, and the HDLC frame is mapped to a nxVT frame with byte alignment.
Features Traditionally, ATM cells are carried within a SONET payload envelope without aligning to any boundary in the SONET frame. Instead, ATM cells are only byte aligned by traditional ATM mapping at the ATM layer. This creates the need to delineate ATM cells at the other end of the SONET transport at the ATM layer, which increases the difficulty and complexity of implementation.
The present invention's auto-alignment technique for carrying ATM cells within a SONET payload envelope removes the need for ATM cell delineation, and, thereby, reduces the probability of cell loss and cell mis- insertion.
The present invention, for variable-size packets over SONET, compared with the traditional Packet - PPP - HDLC - SONET, includes Packet - HDLC - nxVT, which yields a higher bandwidth utilization rate and less implementation difficulty.
The present invention's homogeneous application of these two features enable multi-service transport support over SONET and SDH. Summary The present invention's MSCS 200 enables the encapsulation of fixed-size packets (ATM cells) as well as variable-size packets
(IP/FrameRelay/Ether Frames) within one unifying structure over nxVT, thereby enabling multi-service transport support over SONET and SDH.
The present invention's (1) auto-alignment technique for fixed-size packet and (2) packet direct mapping through DHLC to nxVT for variable- size packets, simplifies the de-capsulation of payload information. The present invention can scale very well as the speed of a network increases.. Conclusion
The present invention relates to optical networking. More particularly, the invention relates to a system and method of mapping fixed- size data packets and variable-size data packets over SONET and SDH.
Having fully described a preferred embodiment of the invention and various alternatives, those skilled in the art will recognize, given the teachings herein, that numerous alternatives and equivalents exist which do not depart from the invention. It is therefore intended that the invention not be limited by the foregoing description, but only by the appended claims.

Claims

CLAIMSWe claim:
1. A method of mapping fixed-size data packets over SONET and SDH comprising:
buffering ATM cells; and
mapping the ATM cells in a nxNT superframe.
2. The method of claim 1 wherein the mapping comprises mapping four ATM cells per NT in the nxNT superframe.
3. The method of claim 1 wherein the mapping comprises mapping 4n ATM cells in a sequence of byte flow in the nxNT superframe, where n is a positive integer.
4. A method of mapping variable-size data packets over SONET and SDH comprising:
encapsulating the packets in High-Level Data Link Control (HDLC) frames; and
mapping the HDLC frames in a nxVT superframe.
5. The method of claim 4 wherein the mapping comprises mapping the packets in a sequence of byte flow in the nxNT superframe.
6. The method of claim 4 wherein the mapping comprises mapping the HDLC frames in a sequence of byte flow in the nxVT superframe.
PCT/US2001/026534 2000-08-23 2001-08-23 System and method of mapping fixed-size data packets and variable-size data packets over sonet and sdh WO2002017543A2 (en)

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US22800800P 2000-08-23 2000-08-23
US60/228,008 2000-08-23
US27279301P 2001-03-01 2001-03-01
US60/272,793 2001-03-01

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PCT/US2001/026533 WO2002017542A2 (en) 2000-08-23 2001-08-23 System and method of binding mpls labels to virtually concatenated sonet/sdh transport connections
PCT/US2001/026557 WO2002017546A2 (en) 2000-08-23 2001-08-23 SYSTEM AND METHOD OF VIRTUALLY CONCATENATING VT1.5s ANS STS-1s OVER SONET AND SDH AND WDM
PCT/US2001/026542 WO2002017545A2 (en) 2000-08-23 2001-08-23 SYSTEM AND METHOD OF nxSTS-1 BANDWIDTH SHARING AND RING PROTECTION
PCT/US2001/026535 WO2002017544A2 (en) 2000-08-23 2001-08-23 Dynamic bandwidth allocation (dba) protocol
PCT/US2001/026567 WO2002017580A1 (en) 2000-08-23 2001-08-23 Dual switch architecture for mixed packet and circuit transports over sonet and sdh and dwdm
PCT/US2001/026534 WO2002017543A2 (en) 2000-08-23 2001-08-23 System and method of mapping fixed-size data packets and variable-size data packets over sonet and sdh

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PCT/US2001/026557 WO2002017546A2 (en) 2000-08-23 2001-08-23 SYSTEM AND METHOD OF VIRTUALLY CONCATENATING VT1.5s ANS STS-1s OVER SONET AND SDH AND WDM
PCT/US2001/026542 WO2002017545A2 (en) 2000-08-23 2001-08-23 SYSTEM AND METHOD OF nxSTS-1 BANDWIDTH SHARING AND RING PROTECTION
PCT/US2001/026535 WO2002017544A2 (en) 2000-08-23 2001-08-23 Dynamic bandwidth allocation (dba) protocol
PCT/US2001/026567 WO2002017580A1 (en) 2000-08-23 2001-08-23 Dual switch architecture for mixed packet and circuit transports over sonet and sdh and dwdm

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WO2002017542A3 (en) 2002-05-16
AU2001288406A1 (en) 2002-03-04
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