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WO1999011092A1 - Procede pour la transmission de trames de couche d'adaptation mta du type aal-5 - Google Patents

Procede pour la transmission de trames de couche d'adaptation mta du type aal-5 Download PDF

Info

Publication number
WO1999011092A1
WO1999011092A1 PCT/DE1998/002121 DE9802121W WO9911092A1 WO 1999011092 A1 WO1999011092 A1 WO 1999011092A1 DE 9802121 W DE9802121 W DE 9802121W WO 9911092 A1 WO9911092 A1 WO 9911092A1
Authority
WO
WIPO (PCT)
Prior art keywords
atm
adaptation layer
aal
connection
atm cells
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.)
Ceased
Application number
PCT/DE1998/002121
Other languages
German (de)
English (en)
Inventor
Wolfgang Fraas
Klaus Hünlich
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Siemens Corp
Original Assignee
Siemens AG
Siemens Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Siemens AG, Siemens Corp filed Critical Siemens AG
Priority to EP98947349A priority Critical patent/EP1005777A1/fr
Priority to CA002300952A priority patent/CA2300952A1/fr
Publication of WO1999011092A1 publication Critical patent/WO1999011092A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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
    • H04L2012/5629—Admission control
    • H04L2012/563—Signalling, e.g. protocols, reference model
    • 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
    • H04L2012/5652—Cell construction, e.g. including header, packetisation, depacketisation, assembly, reassembly
    • H04L2012/5653—Cell construction, e.g. including header, packetisation, depacketisation, assembly, reassembly using the ATM adaptation layer [AAL]
    • H04L2012/5658—Cell construction, e.g. including header, packetisation, depacketisation, assembly, reassembly using the ATM adaptation layer [AAL] using the AAL5

Definitions

  • the invention relates to a method for transmitting ATM adaptation layer frames of the AAL-5 type, which each contain several ATM cells and contain several structures with user data associated with applications in the useful data area of these ATM cells.
  • the ATM adaptation channel which is also called ATM adaptation layer or AAL, is an interface that enables access to an ATM network.
  • the AAL is the interface between ATM and the higher protocol layers. It hides the ATM-specific properties of the transmission from the higher layers and adapts the ATM layer (bidirectionally) to them. For this purpose, the data of the higher layers are packed together with the protocol information of the AAL layer in the information fields of the ATM cells and transmitted as useful information, also known as payload. Since the AAL is responsible for adapting the services of higher layers to ATM, it plays no role in the network itself during the transmission. The AAL is there for the user. It establishes the connection between the subscriber and the network.
  • AAL-5 which was specified in accordance with the international standard ITU-T 1.362 and was initially only intended for data transmission and for the transmission of signaling data, also in the speech area.
  • AAL sublayers In order to meet the requirements placed on the AAL layer by different services, it is divided into sub-layers, so-called AAL sublayers, each with different tasks.
  • the CS function influences the mode of operation of the SAR.
  • the demands placed on the transmission by individual services can be summarized in classes, so-called classes of services. The requirements are shown in ITU-T 1.362.
  • Is "timing relation" between origin (source) and destination (destination) required or not; is the bit rate constant or variable; and a connection-oriented service or a connectionless service is provided.
  • AAL-5 has the advantage of a lower protocol overhead compared to other AALs. In addition, AAL-5 offers better opportunities to detect cell losses using CRC mechanisms across the entire information content.
  • AAL-5 fulfills most service requirements, namely synchronization of origin and destination (timing relation between source and destination), constant bit rate CBR (constant bit rate), variable bit rate VBR, connection-oriented service, connection pipes service, low protocol portion of the payload of the ATM cells (protocol overhead), favorable behavior with regard to "binary alignment”. Only the delay in the transmission of compressed voice data due to the cell filling time is unfavorable. As long as the transfer of uncompressed ISDN data is concerned, the cell fill times do not play a special role.
  • an integer multiple of ATM cells should be selected as a frame, for example based on AAL-5.
  • AAL-5 would enable the security elements contained therein to be used.
  • a substructure can also be chosen to be larger than the actual cell format and that it must be able to overlap the boundaries between two (or more) cells.
  • the structure elements should be known at the transmitter and receiver, namely the size of the AAL frame, the length of a structure element, the number of structure elements in a virtual channel, the assignment of individual structure elements to addresses, information regarding synchronicity or asynchrony and information regarding the constancy of the bit rate, i.e. CBR / VBR. If this information is transmitted in a known manner within AAL frames, the protocol overhead is greatly increased.
  • the object of the present invention is to specify a method for transmitting ATM adaptation layer frames of the AAL-5 type, which each contain a plurality of ATM cells and contain a plurality of structures with useful data associated with applications in the useful data area of these ATM cells.
  • the protocol overhead should only be increased as little as possible.
  • This object is achieved in that the number of ATM cells contained in an ATM adaptation layer frame is specified in a connection-specific manner in order to transmit ATM adaptation layer frames of the AAL-5 type.
  • This has the advantage that, in the case of an existing connection, it is known on the transmitter and receiver side how many ATM cells are contained in an ATM adaptation layer frame for this connection. Corresponding information therefore does not need to be transmitted within each AAL-5 frame.
  • Another development of the invention provides that it is also determined in a connection-specific manner whether all structures of the ATM adaptation layer frame are of the same size or not. Consequently, this information also does not burden the ATM cell area available for useful information when there is a connection. If the structures of the ATM adaptation layer frame are not of the same size, it is advisable that the first element of each substructure, as a length indicator, indicate the length of the substructure element to which it belongs and thus when the next substructure begins.
  • one embodiment of the invention provides for the number of ATM cells per ATM adaptation layer frame to be limited to a maximum of five.
  • the number of ATM cells contained in an ATM adaptation layer frame can be determined by signaling when the connection is set up, in order to avoid the regular transmission of further required information.
  • a special embodiment of the invention provides for the case of quasi-static connections, e.g. between a base station and the assigned base station controller or a mobile switching center of a mobile radio network, to administratively determine the number of ATM cells contained in an ATM adaptation layer frame when setting up a connection.
  • Subscriber information can be specified on a connection-specific basis the one that could then also be transmitted via signaling or administratively.
  • An integer number of ATM cells is used as the structure of an AAL-5 frame.
  • the number of cells per structure is either to be negotiated when signaling as part of the connection establishment or to be determined by administration. in the
  • the length of a frame 5 should not exceed, as will be explained in more detail below.
  • Substructures can overlap from one ATM cell to the next ATM cell within an AAL-5 frame.
  • each element contains as the first octet a pointer which points to the beginning of the following element.
  • This pointer is one octet long so that up to 256 octets can be numbered.
  • the pointer can be omitted.
  • the selected length must either be negotiated as part of the signaling or determined by administration.
  • the length of the structural elements must always be specified in integer multiples of octets. Special processor or bus properties can be taken into account.
  • the method described is characterized in that no address information has to be given to the individual structural elements. Synchronization measures that become necessary due to frame loss can be based on AAL-5 mechanisms. No additional agreements are necessary for this, which concern the formats used. Marking the last cell of a frame with AAL5 is sufficient.
  • New formats can be defined and then negotiated by signaling or administration without having to intervene in existing procedures.
  • FIG an AAL-5 frame of layer two L2 AAL-5, consisting of four ATM cells, each with header H and not individually identified payload part.
  • AAL-5 frame data of a higher layer L3: PDU1, L3: PDU2 and L3: PDU3 are converted.
  • L3 PDU2 leads to a variable substructuring, the individual substructures being larger than cell formats, and the implementation of the information L3: PDU3 leads to a variable substructuring, the individual substructures being smaller than cell formats.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)

Abstract

Pour la transmission de trames de couche d'adaptation MTA du type AAL-5, qui contiennent respectivement plusieurs cellules MTA et renferment dans la zone des données utiles de ces cellules MTA plusieurs structures avec des données utiles affectées à des applications, le nombre des cellules MTA contenues dans une trame de couche d'adaptation MTA est déterminé en fonction de la connexion.
PCT/DE1998/002121 1997-08-21 1998-07-27 Procede pour la transmission de trames de couche d'adaptation mta du type aal-5 Ceased WO1999011092A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP98947349A EP1005777A1 (fr) 1997-08-21 1998-07-27 Procede pour la transmission de trames de couche d'adaptation mta du type aal-5
CA002300952A CA2300952A1 (fr) 1997-08-21 1998-07-27 Procede pour la transmission de trames de couche d'adaptation mta du type aal-5

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19736443.8 1997-08-21
DE19736443 1997-08-21

Publications (1)

Publication Number Publication Date
WO1999011092A1 true WO1999011092A1 (fr) 1999-03-04

Family

ID=7839756

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE1998/002121 Ceased WO1999011092A1 (fr) 1997-08-21 1998-07-27 Procede pour la transmission de trames de couche d'adaptation mta du type aal-5

Country Status (3)

Country Link
EP (1) EP1005777A1 (fr)
CA (1) CA2300952A1 (fr)
WO (1) WO1999011092A1 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5533021A (en) * 1995-02-03 1996-07-02 International Business Machines Corporation Apparatus and method for segmentation and time synchronization of the transmission of multimedia data
WO1997016046A1 (fr) * 1995-10-24 1997-05-01 General Instrument Corporation Transmission par salves de longueur variable sur la couche physique d'un systeme de transmission multicouche

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5533021A (en) * 1995-02-03 1996-07-02 International Business Machines Corporation Apparatus and method for segmentation and time synchronization of the transmission of multimedia data
WO1997016046A1 (fr) * 1995-10-24 1997-05-01 General Instrument Corporation Transmission par salves de longueur variable sur la couche physique d'un systeme de transmission multicouche

Also Published As

Publication number Publication date
EP1005777A1 (fr) 2000-06-07
CA2300952A1 (fr) 1999-03-04

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