AU745233B2 - Method for data transmission in an ATM switching center - Google Patents

Method for data transmission in an ATM switching center Download PDF

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Publication number
AU745233B2
AU745233B2 AU77562/98A AU7756298A AU745233B2 AU 745233 B2 AU745233 B2 AU 745233B2 AU 77562/98 A AU77562/98 A AU 77562/98A AU 7756298 A AU7756298 A AU 7756298A AU 745233 B2 AU745233 B2 AU 745233B2
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AU
Australia
Prior art keywords
atm
transmitting
minicells
switching center
information
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Ceased
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AU77562/98A
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AU7756298A (en
Inventor
Reinhard Franz
Manfred Goretzki
Christian Hinterberger
Michael Koch
Josef Singer
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Nokia Solutions and Networks GmbH and Co KG
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Siemens AG
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Publication of AU7756298A publication Critical patent/AU7756298A/en
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Publication of AU745233B2 publication Critical patent/AU745233B2/en
Assigned to NOKIA SIEMENS NETWORKS GMBH & CO. KG reassignment NOKIA SIEMENS NETWORKS GMBH & CO. KG Alteration of Name(s) in Register under S187 Assignors: SIEMENS AKTIENGESELLSCHAFT
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • H04L49/30—Peripheral units, e.g. input or output ports
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L49/00—Packet switching elements
    • H04L49/20—Support for services
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L49/00—Packet switching elements
    • H04L49/30—Peripheral units, e.g. input or output ports
    • H04L49/3081—ATM peripheral units, e.g. policing, insertion or extraction
    • 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
    • H04J2203/0089—Multiplexing, e.g. coding, scrambling, SONET
    • 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
    • H04L2012/5603—Access techniques
    • H04L2012/5604—Medium of transmission, e.g. fibre, cable, radio
    • H04L2012/5607—Radio
    • 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]
    • H04L2012/5656—Cell construction, e.g. including header, packetisation, depacketisation, assembly, reassembly using the ATM adaptation layer [AAL] using the AAL2
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L49/00—Packet switching elements
    • H04L49/10—Packet switching elements characterised by the switching fabric construction
    • H04L49/103—Packet switching elements characterised by the switching fabric construction using a shared central buffer; using a shared memory
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L49/00—Packet switching elements
    • H04L49/25—Routing or path finding in a switch fabric
    • H04L49/253—Routing or path finding in a switch fabric using establishment or release of connections between ports
    • H04L49/254—Centralised controller, i.e. arbitration or scheduling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L49/00—Packet switching elements
    • H04L49/30—Peripheral units, e.g. input or output ports
    • H04L49/3009—Header conversion, routing tables or routing tags
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/12—Access point controller devices

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)
  • Mobile Radio Communication Systems (AREA)

Description

GR 97 P 1387 Description Method for transmitting information in an ATM switching center The invention relates to a method for transmitting information in an ATM switching center, and to such an ATM switching center.
As is known from R. Handel, "Evolution der Netze mit ATM" [Evolution of networks with ATM], telcom report 17 (1994), issue i, pages 8-11, future broadband (wideband) networks, such as broadband ISDN, will be constructed on the ATM principle. A range of new services will be possible in these networks.
The design of digital radio networks is described in J. Oudelaar, "Evolution towards UMTS", PIMRC 94, 5th IEEE International Symp. on Personal, Indoor and Mobile Radio Communications, The Hague, NL, September 18-22, 1994, pages 852-856, and M. Lenti, H. Hageman "Paging in UMTS", RACE Mobile Telecommunications Workshop, Vol. i, Amsterdam, NL, May 17-19, 1994, pages 405-410.
The mobile radio systems which exist at the moment, such as the GSM (Global System for Mobile Communications), are, however, not designed for ATM traffic. Even the DECT (Digital European Cordless Telephone) cordless telephone system is not yet intended for broadband ATM traffic, but is designed for cordless subscriber access for voice transmission, mainly for use in rooms and buildings.
WO 95/34977 discloses an ATM transmission device which can transmit ATM minicells. These ATM minicells are more suitable than ATM cells for voice transmission. The introduction of such an ATM transmitting r- 2 device based on ATM minicells involves major financial costs, however.
A similar transmitting device for short-length packets, which are shorter than ATM cells, is disclosed in US 5 301 189.
EP 0758 174 Al discloses an ATM communications network. In the "Mobile Gateway Switching Center", as the access to the fixed network, and in the base stations, data sent by the communication terminals are split into short-length packets, and these short-length packets are embedded in conventional ATM cells. The ATM switching centers which are required between the "Mobile Gateway Switching Center" and the base stations are arranged on an ATM cell basis. However, the ATM 15 communications network requires major financial investments.
The splitting of short-length packets and the embedding of short-length packets in conventional ATM cells are likewise known from Nakamura et al.: "Using ATM to carry very low bit-rate mobile voice signals" 1995 4th IEEE International Conference on Universal Personal Communications Record, Nov 6-10, 1995, No.
Conf. 4, pages 863-867, Institute of Electrical and Electronics Engineers.
The invention is therefore based on the object of specifying a method and an ATM switching center, which allow economic migration from existing communications networks to future communications networks with ATM minicells. This object is achieved by a method having the features in patent claim 1, and by the ATM switching center with the features in patent claim 8. Advantageous developments can be found in the dependent claims.
-2a- According to one aspect of the present invention there is provided a method for transmitting information in an Asynchronous Transfer Mode (ATM) switching center, said switching center comprising an ATM transmitting device for transmitting ATM cells in a plurality of virtual channels, and at least two transmitting devices for transmitting ATM minicells, said transmitting devices for transmitting ATM minicells including organization information for said ATM minicells, said method comprising the steps of: assigning organization information from individual connections in each case to ATM minicells; embedding the ATM minicells in ATM cells based on the organization information; and transmitting the ATM cells in virtual channels utilising the ATM transmitting device.
According to another aspect of the present invention there is provided an ATM switching center comprising an ATM transmitting device for transmitting ATM cells on a plurality of virtual channels, wherein the ATM switching center further comprises at least two transmitting devices for transmitting ATM minicells, said transmitting devices for said transmitting said ATM minicells containing organization information for the ATM minicells, said ATM switching center comprising: ~assigning means for assigning information from the individual connections in each case to ATM minicells; and embedding means for embedding the ATM minicells in ATM cells based on the organization information, wherein the ATM cells are transmitted by the ATM transmitting device on virtual channels.
Known ATM bus structures or devices such as EWSX or SSNC for Siemens AG can thus be used as the ATM transmitting device, while at the same time exploiting the advantages of ATM mincells. By switching information of the individual connections through in two stages (which information may be voice information, digital data or else signalling information) and by means of the function split between the ATM transmitting device and the transmitting devices for ATM cells, a structure is created which can be retrofitted, is flexible and is highly suitable for migration to future communications network. Furthermore, higher transmission rates.
V [R:\LIBPP]2499.doc:edg GR 97 P 1387 3are possible than with pure ATM minicell transmission.
The method according to the invention is particularly relevant for future mobile radio standards, such as FPLMTS (Future Public Land Mobile Telecommunication System) and UMTS (Universal Mobile Telecommunication System). These planned systems may be designed as shown in Figures 1 to 5, as described in the following text, in order to manage ATM traffic. It is likewise envisaged to allow the transmission of ATM cells at bit rates up to 2 Mbit/s in so-called Wireless Access Networks that is to say to allow subscriber access to a stationery subscriber via a radio interface which, for example, uses a CDMA radio transmission method.
According to an advantageous refinement of the invention, the ATM cells are evaluated in the transmitting devices for ATM minicells, and the information of the individual connections is recovered in the ATM minicell. These measures not only allow ATM minicells to be produced but also allow information to be recovered from the ATM minicells. Bidirectional transmissions are thus also supported.
It is also advantageous that, the lengths of the ATM minicells can be set individually corresponding to the connections by the transmitting devices for ATM minicells. This makes it possible, for example, to distinguish between the voice and signaling information, and so select the best cell length for the ATM minicells in each case.
According to a further advantageous refinement, the information of the individual connections is received from the transmitting device for ATM minicells using an STM transmission method. STM transmission method, such as PCM30 for example in the case GAS mobile radio networks via the Abis and the GR 97 P 1387 4 Asub interface, PCM24, SO, PDH or SDH, can thus be used in the future for some or all connections during which transmission takes place in the ATM transmitting device on an ATM basis. The ATM transmitting device can thus be upgraded in stages from use in an STM environment to use in an ATM environment.
If the ATM minicell cell lengths are appropriate, it is advantageous for the information of an individual connection to be gathered over a plurality of receiving times, and then to be assigned to an ATM minicell. This filling of ATM minicells results in the transmission capacity being better utilized.
Maximum flexibility is achieved if the embedding of the ATM minicells in the ATM cell is independent of the cell grid of the ATM cells. The ATM minicells can thus be written in the ATM cells beyond the cell boundaries. This shortens the delay times.
The transmitting devices for ATM minicells advantageously produce organization information for the ATM cells and the ATM minicell, and embed this information in the corresponding cells. The organization information (header) for the ATM cells is evaluated in the ATM transmitting device, in order to pass the ATM cell through corresponding to the virtual channel. The organization information for the ATM minicells is evaluated by an output-side transmitting device for ATM minicells in order to read the information of the individual connections from the ATM minicells once again, and to pass this information on.
Advantageous refinements of the invention envisage the the ATM switching center is in the form of a base station controller of a mobile radio network or a network concentrator of an access network. Major investments have already been made in the network infrastructure for such networks, so that GR 97 P 1387 step-by-step matching to ATM transmission is of major importance.
If the transmitting devices for ATM minicells are in the form of peripheral assemblies, referred to as so-called Line Interface Cards (LIC), then Line Interface Cards for ATM or STM transmission methods can be matched to the specific requirements for the ATM switching center in various ways by a freely chosen combination.
The invention will be explained in more detail in the following text using exemplary embodiments and with reference to the drawing illustrations, in which: Figure 1 shows a schematic illustrations of the interfaces of a mobile radio network according to the prior art, Figure 2 shows a schematic illustrations of the interfaces of a mobile radio network having an ATM connection between a base station controller and a mobile switching center, Figure 3 shows a schematic illustrations of the interfaces of a mobile radio network having an ATM connection between a base station controller and a mobile switching center or base station, Figure 4 shows a schematic illustrations of the interfaces -of a mobile radio network having an ATM connection between a mobile switching center and an ATM network, Figure 5 shows a schematic illustrations of the interfaces of a mobile radio network having an ATM connection between a mobile switching center and an ATM network, and a base station having a UMTS radio interface, '±t4t4 ~v K. K' AK GR 97 P 1387 6- Figure 6 shows a schematic illustrations of an ATM switching center, and Figure 7 shows a virtual channel having ATM cells and ATM minicells.
Figure 1 shows devices and interfaces for a GSM mobile radio network. There is a radio interface using a TDMA method (time division multiple access) between a mobile station MS and a base station BTS. The base station BTS is connected to a base station controller BSC via a PCM (pulse code modulation) interface Abis, and the base station controller BSC carries out control functions and radio resource management functions for the base stations.
The base station controller BSC is connected via a further PCM interface Abis to a transcoder unit TRAU, which carries out functions relating to channel coding and channel matching between the base station BTS and a mobile switching center MSC. The transcoder unit TRAU is likewise connected via a PCM interface to the mobile switching center MSC. Networking of a plurality of mobile switching centers MSC with one another and the handover to other communications networks are also carried out using the STM transmission method.
Based on this network configuration, the aim is now to transmit on the basis of ATM minicells, using an AAL2 (ATM adaptation layer 2) protocol. To do this, the base station controller BSC called the ATM switching center BSC from now on, is upgraded in the manner according to the invention. Figures 6 and 7 show further details relating to this.
The migration steps which are envisaged toward a future mobile radio network, for example a UMTS communications network, are shown in Figures 2 to GR 97 P 1387 7 According to Figure 2, there is an ATM connection for ATM minicells ATM(AAL2) between the ATM switching center BSC and a further mobile switching center MSC. Furthermore, according to Figure 3, a base station BTS can be connected via such an ATM connection for ATM minicells ATM(AAL2) to the ATM switching center BSC. A further migration step is shown in Figure 4. The ATM switching center BSC is connected to a mobile switching center MSC via an ATM connection for AMT minicells ATM(AAL2), in which case this mobile switching center MSC is connected to an ATM communications network (backbone network). Closed ATM transmission to the radio interface is also possible in this case.
The mobile radio network shown in Figure 5 is a future UMTS communications network, in which the radio interface has also been redesigned, thus using an advantageous combination of TDMA, FDMA (frequency division multiple access) and CDMA (code division multiple access) for subscriber separation on the radio interface. The ATM switching center BSC according to the invention is also used in this scenario.
Figure 6 shows an ATM switching center BSC which contains an ATM transmitting device CC, five transmitting devices LIC for ATM minicells ml, m2, m3, mn, a central processor MPU for voice transmission, a central processor MPU-GPRS for packet data transmission, an alarm unit ALI and a memory unit SP.
The transmitting devices LIC for ATM minicells ml, m2, m3, mn are connected to the ATM transmitting device CC via ATM connections. Two transmitting devices LIC for ATM minicells ml, m2, m3, mn on the left are connected via connecting lines using an STM transmission method PCM30 (30 useful data channels with submultiplexing for four individual connections and two signaling channels in each case), GR 97 P 1387 8 via the Abis interface, to base stations BTS. Two further ATM transmitting devices LIC for ATM minicells ml, m2, m3, mn on the left are likewise connected via connecting lines using an STM transmission method PCM30, via the Asub interface, to a mobile switching center MSC. A third such transmitting device LIC is connected via a connecting line to a mobile switching center MSC, via an ATM connection.
The ATM transmitting devices LIC are in the form of peripheral assemblies and match the connections to the base stations BTS and the mobile switching centers MSC. They produce ATM minicells ml, m2, m3, mn, and evaluate these ATM minicells ml, m2, m3, mn.
Virtual channels VC are connected solid line by means of the ATM transmitting device CC between the ATM transmitting devices LIC of the Abis and Asub interfaces. The ATM transmitting device CC connects the virtual channels VC on the basis of ATM multiplexing.
Figure 6 furthermore shows signaling connections dashed line which are connected between the ATM transmitting devices LIC of the Abis and Asub interfaces, or end in the central processor MPU. The signaling connections are switched via the ATM transmitting device CC and the central processor MPU. A central processor MPU-GPRS for packet data transmission using GPRS is also connected to the ATM transmitting device CC, and carries out the signaling for this service. The central processors carry out the conversion of the signaling protocols LAPD on the Abis interface and CCS7 of the Asub interface, and use the ATM protocol AAL1. They are also connected to the memory device SP, which is formed by a hard disk, and to the alarm device ALI. The hard disk SP stores the assignment information for the signaling, and the alarm device L Y~4 I~r GR 97 P 1387- 9 ALI evaluates error messages, and signals them to an operation and maintenance center.
The function of the ATM transmitting devices LIC for the minicells ml, m2, m3, mn with the aid of a stored assignment table Tab is evident from the illustration of the virtual channel VC shown in Figure 7. ATM cells al, a2 are transmitted in this virtual channel VC, using the ATM transmission method. These ATM cells al, a2 have a length of 53 bytes in this case, with 5 bytes representing the organization information Ha, and 48 bytes representing the useful information. These ATM cells al, a2 can be transmitted by the ATM transmitting device CC in the conventional way.
The useful information part of the ATM cells al, a2 contains ATM minicells ml, m2, m3, inn, which are in turn composed of organization information Hm and useful information ci. This useful information cl is the information of a virtual connection, which arrive at the ATM switching center BSC, or is sent there, via the STM or ATM connections from the base stations BTS or mobile switching centers MSC.
The ATM transmitting devices LIC are used to carry out the format conversion of the information ci, c2, c3, c4 of the individual connections, for example the four submultiplex channels of one of the 30 PCM channels, into ATM minicells ml, m2, m3, inn, as well as the embedding of the ATM minicells ml, m2, m3, mn in ATM cells al, a2 for transmission to the ATM transmitting device ci, c2, c3, c4, and for recovering the information ci, c2, c3, c4 from the ATM cells al, a2 received from the ATM transmitting device CC.
The ATM switching device LIC receives information ci, c2, c3, c4, for example in the form of two bits in each case, in one time slot of the PCM connection from four communication connections.
Characteristic organization information Hm GR 97 P 1387 of the ATM minicells ml, m2, m3, mn is produced for each of these four communication connections, and is used during the connection. The useful information has a length of, for example, 1 byte 8 bits, so that the information cl from four successive time slots in a communication connection is in each case gathered and is written to an ATM minicell ml, with the aid of the assignment table Tab.
The ATM cell al is filled with the aid of the assignment table Tab by writing a plurality of ATM minicells ml, m2, m3, mn to the ATM cell al. In order to keep information delays short (as is important for voice transmission), it is necessary to ensure that an ATM cell al for the information items cl, c2, c3, c4 is transmitted at short intervals.
The length of the ATM minicells ml, m2, m3, mn is set by the ATM transmitting devices LIC and is indicated by a length designation in the organization information Hm, so that different cell lengths can be used for voice connections and signaling connections.
Furthermore, when filling the ATM cell al, a2 with the ATM minicells ml, m2, m3, mn, it is possible to overrun cell boundaries. An ATM minicell mn can also be transmitted in two ATM cells al and a2.
i

Claims (8)

1. A method for transmitting information in an Asynchronous Transfer Mode (ATM) switching center, said switching center comprising an ATM transmitting device for transmitting ATM cells in a plurality of virtual channels, and at least two transmitting devices for transmitting ATM minicells, said transmitting devices for transmitting ATM minicells including organization information for said ATM minicells, said method comprising the steps of: assigning organization information from individual connections in each case to ATM minicells; embedding the ATM minicells in ATM cells based on the organization information; and transmitting the ATM cells in virtual channels utilising the ATM transmitting device.
2. The method as claimed in claim 1, wherein the ATM cells are evaluated in the transmitting devices for transmitting ATM minicells, and the information from the individual connections is recovered in the ATM minicells. 20 3. The method as claimed in any one of claims 1 or 2, wherein the lengths of the ATM minicells can be set individually corresponding to the connections by the "transmitting devices for transmitting ATM minicells.
4. The method as claimed in any one of the preceding claims, wherein the information from the individual connections is received from the transmitting device for transmitting ATM minicells using an STM transmission method. The method as claimed in claim 4, wherein the information from an individual connection is gathered over a plurality of receiving times, and is then assigned to an ATM minicell.
6. The method as claimed in any one of the preceding claims, wherein the ATM minicells are embedded in the ATM cell independently of the cell grid of the ATM cells. [R:\LIBPP]2499.doc:edg wf,
12- 7. The method as claimed in any one of the preceding claims, wherein organization information for the ATM cells and for the ATM minicell is produced by the transmitting devices for transmitting ATM minicells and is embedded in the corresponding cells. 8. An ATM switching center comprising an ATM transmitting device for transmitting ATM cells on a plurality of virtual channels, wherein the ATM switching center further comprises at least two transmitting devices for transmitting ATM minicells, said transmitting devices for said transmitting said ATM minicells containing organization information for the ATM minicells, said ATM switching centre comprising: assigning means for assigning information from the individual connections in each case to ATM minicells; and embedding means for embedding the ATM minicells in ATM cells based on the organization information, wherein the ATM cells are transmitted by the ATM transmitting device on virtual channels. 9. The ATM switching center as claimed in claim 8, wherein the transmitting devices for ATM minicells are in the form of a peripheral device of the transmitting 2 device. The ATM switching center as claimed in any one of claims 8 or 9, wherein said transmitting devices for transmitting ATM minicells are configured for conversion of information from individual connections from an STM transmission configuration to an ATM transmission configuration. 11. The ATM switching center as claimed in any one of claims 9 or 10, wherein peripheral assemblies are connected to said switching center in order to receive information using an STM transmission method and using an ATM transmission method. 12. The ATM switching center as claimed in any one of claims 8 to 11, further comprising switching devices for said ATM minicells, said switching devices comprising means for storing an assignment table for assignment of in each case one individual connection to organization information for ATM minicells and means for evaluating the assignment table. [R:\LIBPP]2499.doc:cdg
13- 13. The ATM switching center as claimed in any one of claims 8 to 11, said switching center being configured in the form of a base station controller of a mobile radio network.
14. The ATM switching center as claimed in any one of claims 8 to 12, said switching center being configured in the form of a network concentrator of an access network. .ocumeft received on: 7 'JAM2 [R:\LIBPP]2499.doc:kxa -14- A method for transmitting information of individual connections in an ATM switching centre, substantially as herein described with reference to any one of the embodiments as illustrated in Figs. 2 to 7.
16. An ATM switching centre, substantially as herein described with reference to any one of the embodiments as illustrated in Figs. 2 to 7. DATED this Eighth Day of September, 1999 Siemens Aktiengesellschaft o Patent Attorneys for the Applicant SPRUSON FERGUSON o• o• o ooo ••o 0oo o o• oo•0 o• [R:\LIBW]10004.doc:iad
AU77562/98A 1997-03-24 1998-03-20 Method for data transmission in an ATM switching center Ceased AU745233B2 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19712259A DE19712259C1 (en) 1997-03-24 1997-03-24 Data exchange method in ATM exchange
DE19712259 1997-03-24
PCT/DE1998/000841 WO1998043394A2 (en) 1997-03-24 1998-03-20 Method for data transmission in an atm switching center

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Publication Number Publication Date
AU7756298A AU7756298A (en) 1998-10-20
AU745233B2 true AU745233B2 (en) 2002-03-14

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EP (1) EP0972424B1 (en)
JP (1) JP2001518260A (en)
KR (1) KR100538913B1 (en)
CN (1) CN1108726C (en)
AU (1) AU745233B2 (en)
BR (1) BR9808056A (en)
DE (2) DE19712259C1 (en)
ES (1) ES2203964T3 (en)
WO (1) WO1998043394A2 (en)

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Publication number Priority date Publication date Assignee Title
DE19842789C2 (en) * 1998-09-18 2002-02-07 Siemens Ag Method for the transmission of voice information in a communication system

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5301189A (en) * 1991-08-19 1994-04-05 Siemens Aktiengesellschaft Telecommunication network having ATM switching centers and STM switching centers
EP0758174A1 (en) * 1995-02-23 1997-02-12 Ntt Mobile Communications Network Inc. Method and device for multi-cell transmission

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE503317C2 (en) * 1994-06-13 1996-05-13 Ericsson Telefon Ab L M Way and selector node for connecting STM cells in a circuit-emulated ATM selector

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5301189A (en) * 1991-08-19 1994-04-05 Siemens Aktiengesellschaft Telecommunication network having ATM switching centers and STM switching centers
EP0758174A1 (en) * 1995-02-23 1997-02-12 Ntt Mobile Communications Network Inc. Method and device for multi-cell transmission

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EP0972424A2 (en) 2000-01-19
AU7756298A (en) 1998-10-20
WO1998043394A2 (en) 1998-10-01
DE59809087D1 (en) 2003-08-28
BR9808056A (en) 2000-03-08
DE19712259C1 (en) 1998-04-23
JP2001518260A (en) 2001-10-09
CN1108726C (en) 2003-05-14
EP0972424B1 (en) 2003-07-23
KR100538913B1 (en) 2005-12-27
ES2203964T3 (en) 2004-04-16
KR20000076350A (en) 2000-12-26
WO1998043394A3 (en) 1998-12-23
CN1251251A (en) 2000-04-19

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