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WO1999011093A1 - Procede pour transmettre des donnees utiles pouvant etre affectees a differentes applications - Google Patents

Procede pour transmettre des donnees utiles pouvant etre affectees a differentes applications Download PDF

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Publication number
WO1999011093A1
WO1999011093A1 PCT/DE1998/002191 DE9802191W WO9911093A1 WO 1999011093 A1 WO1999011093 A1 WO 1999011093A1 DE 9802191 W DE9802191 W DE 9802191W WO 9911093 A1 WO9911093 A1 WO 9911093A1
Authority
WO
WIPO (PCT)
Prior art keywords
substructures
atm
substructure
determined
frame
Prior art date
Application number
PCT/DE1998/002191
Other languages
German (de)
English (en)
Inventor
Klaus Hünlich
Wolfgang Fraas
Original Assignee
Siemens Aktiengesellschaft
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 Aktiengesellschaft filed Critical Siemens Aktiengesellschaft
Priority to CA002300965A priority Critical patent/CA2300965A1/fr
Priority to EP98948697A priority patent/EP1005778A1/fr
Publication of WO1999011093A1 publication Critical patent/WO1999011093A1/fr

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 user data, which can be assigned to different applications, between an A-side and B-side of an ATM transmission link, with data assigned to the individual applications in each case within an ATM containing a plurality of ATM cells.
  • Adaptation layer frame are transmitted in the substructures contained in the ATM cells and the useful data of the substructures can each be forwarded differently depending on the receiver-side application assignments.
  • the ATM adaptation layer which is also called the AT adaptation layer or AAL, is of major importance.
  • 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 for the user there. It establishes the connection between the subscriber and the network.
  • driver programs are used instead of special processors, which already use powerful processors in computers. This should also be done in order to adapt the data to be transmitted to the network requirements. This led to to use the AAL-5 specified in accordance with the international standard ITU-T 1.362, 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.
  • 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.
  • additional properties of the structural elements should be known to the sender and receiver, namely the size of the AAL frame, the length of a structural element, the number of structural elements in a virtual channel, the assignment of individual structural elements to addresses, information regarding synchronicity or Asynchronicity 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 provide a method for transmitting user data that can be assigned to different applications between an A side and a B side of an ATM transmission link, data assigned to the individual applications in each case within an ATM adaptation layer frame containing a plurality of ATM cells Substructures contained in the ATM cells are transmitted without the protocol overhead being greatly increased.
  • additional information regarding the format of the substructures can be defined administratively or in the signaling phase via signaling.
  • An administrative specification is recommended for transmission lines whose use does not change, for example a connection between a base station and a base station controller or a mobile radio switching center and a base station controller in a mobile radio system.
  • the number of ATM cells which an ATM adaptation layer frame contains is determined administratively or in the signaling phase by signaling, this information need not be transmitted when there is an existing connection.
  • the start of the first substructure within a frame is preferably determined by the start of the frame.
  • the first element of each substructure element specifies the length of the substructure element to which it belongs and thus when the next substructure begins.
  • the length of a substructure element is preferably determined by the value range 1 of a length indicator field.
  • the length of the substructures can also be determined by administration.
  • the ATM adaptation layer frame can preferably correspond to the AAL-5 frame according to the ATM form.
  • a connection between the A side and the B side can be bidirectional with respect to the substructures of an ATM adaptation layer frame.
  • a particularly advantageous embodiment of a method according to the invention provides that if no network data are to be transmitted within a substructure when using substructures of different sizes, the length of the substructure is shortened by the part intended for useful data.
  • a substructure can also extend over the useful data area of two adjacent ATM cells and thus enclose the header information area of an ATM cell.
  • An integer number of ATM cells is used as the structure of an AAL-5 frame.
  • the number of cells per structure must be negotiated when signaling when establishing a connection.
  • the length of a frame 5 should not exceed, as will be explained in more detail below.
  • Substructures can be within an AAL-5 frame of one
  • each element contains a pointer as the first octet, which points to the beginning of the following element.
  • This pointer is one octet long, so that up to 256 octets can be numbered consecutively.
  • the linkage 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 here.
  • 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 loss of frame can affect AAL-5 Support 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 via signaling without having to intervene in existing procedures.
  • FIG shows 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.
  • Data of a higher layer L3: PDU1, L3: PDU2 and L3: PDU3 are converted in this AAL-5 frame.
  • the conversion of the information L3: PDU1 leads to an equidistant substructure
  • the conversion of the information L3: PDU2 leads to a variable substructuring, the individual substructures being larger than cell formats and that Implementation of information L3: PDU3 leads to a variable

Landscapes

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

Abstract

L'invention concerne un procédé pour la transmission de données utiles, lesquelles peuvent être affectées à différentes applications, entre un côté A et un côté B d'une section de transmission MTA. Les données affectées aux différentes applications sont transmises respectivement à l'intérieur d'une trame de couche d'adaptation MTA contenant plusieurs cellules MTA, dans les sous-structures pouvant être affectées aux applications. A cet effet, l'affectation côté A et l'affectation côté B des sous-structures d'une trame de couche d'adaptation MTA sont déterminées par voie administrative. D'autres informations peuvent également être déterminées par voie administrative, comme par exemple le nombre des cellules MTA contenant une trame de couche d'adaptation MTA, ou bien l'information consistant à savoir si les différentes sous-structures sont de la même grandeur.
PCT/DE1998/002191 1997-08-21 1998-07-31 Procede pour transmettre des donnees utiles pouvant etre affectees a differentes applications WO1999011093A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CA002300965A CA2300965A1 (fr) 1997-08-21 1998-07-31 Procede pour transmettre des donnees utiles pouvant etre affectees a differentes applications
EP98948697A EP1005778A1 (fr) 1997-08-21 1998-07-31 Procede pour transmettre des donnees utiles pouvant etre affectees a differentes applications

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19736440.3 1997-08-21
DE19736440 1997-08-21

Publications (1)

Publication Number Publication Date
WO1999011093A1 true WO1999011093A1 (fr) 1999-03-04

Family

ID=7839754

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE1998/002191 WO1999011093A1 (fr) 1997-08-21 1998-07-31 Procede pour transmettre des donnees utiles pouvant etre affectees a differentes applications

Country Status (3)

Country Link
EP (1) EP1005778A1 (fr)
CA (1) CA2300965A1 (fr)
WO (1) WO1999011093A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000033589A1 (fr) * 1998-11-30 2000-06-08 Nokia Networks Oy Technique de planification des capacites d'interface hertzienne

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

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
JOHNSSON M ET AL: "SUPPORT FOR LOW BITRATE APPLICATIONS IN ATM NETWORKS", PROCEEDINGS OF IFIP WORKSHOP ON PERFORMANCE MODELLING AND EVALUATION OF ATM NETWORKS, 3 June 1996 (1996-06-03), pages 39/1 - 39/14, XP002045906 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000033589A1 (fr) * 1998-11-30 2000-06-08 Nokia Networks Oy Technique de planification des capacites d'interface hertzienne
US6636497B1 (en) 1998-11-30 2003-10-21 Nokia Networks Oy Air interface capacity scheduling method

Also Published As

Publication number Publication date
CA2300965A1 (fr) 1999-03-04
EP1005778A1 (fr) 2000-06-07

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