EP0998832A2 - Procede et systeme de communication radio pour la transmission d'informations au moyen de cellules mta - Google Patents

Procede et systeme de communication radio pour la transmission d'informations au moyen de cellules mta

Info

Publication number
EP0998832A2
EP0998832A2 EP98947304A EP98947304A EP0998832A2 EP 0998832 A2 EP0998832 A2 EP 0998832A2 EP 98947304 A EP98947304 A EP 98947304A EP 98947304 A EP98947304 A EP 98947304A EP 0998832 A2 EP0998832 A2 EP 0998832A2
Authority
EP
European Patent Office
Prior art keywords
message
base station
radio interface
mobile
bts
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.)
Withdrawn
Application number
EP98947304A
Other languages
German (de)
English (en)
Inventor
Michael Koch
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
Original Assignee
Siemens AG
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 filed Critical Siemens AG
Publication of EP0998832A2 publication Critical patent/EP0998832A2/fr
Withdrawn legal-status Critical Current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
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/185—Space-based or airborne stations; Stations for satellite systems
    • H04B7/18578—Satellite systems for providing broadband data service to individual earth stations
    • H04B7/18582—Arrangements for data linking, i.e. for data framing, for error recovery, for multiple access
    • 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
    • H04L2012/5603—Access techniques
    • H04L2012/5604—Medium of transmission, e.g. fibre, cable, radio
    • H04L2012/5608—Satellite

Definitions

  • the invention relates to a method and a radio communication system for transmitting information by means of ATM cells via a radio interface between base stations and mobile stations.
  • Mobile stations can also be fixed terminals in the sense of an access network.
  • the invention is based on the object of specifying in a radio communication system an information transmission with ATM cells which limits the distances, ie on satellite routes or on small cells ( ⁇ 500m) the base station and the mobile stations.
  • the object is achieved by the method with the features of claim 1 and the radio communication system with the features of claim 13.
  • the invention makes use of the knowledge that, in both cases of the scenarios described above, the differences in the signal propagation times between the base station and the various mobile stations are negligible and therefore no additional problems of controlling the transmission times for the information transmission via the radio interface have arisen up to now. All mobile stations could be treated equally. In the first case (satellite radio) the total signal transit time is very long and the different positions of the mobile stations on earth are negligible. In the second case, the differences in signal transit times between the mobile stations due to the short distances are negligible.
  • a base station sends a first message with which configuration of the radio interface is initiated.
  • a mobile station receives the first message, whereupon this mobile station sends a second message.
  • the base station determines a time of reception for the second message and from it a correction value which is used to synchronize the information transmission via the radio interface.
  • the radio interface is also used when the radio resources are used to a high degree Distance range of greater than 500 m and less than 22,000 miles for the information transfer using ATM cells.
  • the cell size can thus be comparable to the existing public mobile radio networks, such as GSM.
  • the base station transmits the correction value to the mobile station with a third message, so that the mobile station uses the correction value to carry out a synchronization of the information transmission via the radio interface.
  • the base station i.e. network-side components, the calculation of correction values for the mobile stations, so that the mobile stations are relieved of such tasks and only convert the respective correction value into a corresponding time of transmission.
  • the radio interface enables direct cell transmission from ATM cells, i.e. a radio interface aligned with ATM cells, or a transmission of ATM cells within a digital mobile radio network.
  • the synchronization of the information transmission enables the creation of a cellular structure of the radio communication system, as is required in terrestrial mobile radio networks.
  • an existing digital mobile radio network is used to transmit the ATM cells, its radio interface can be a radio interface based on CDMA (radio interface which enables subscriber access by means of subscriber codes), a radio interface based on FDMA (radio interface which enables subscriber access by means of subscriber codes), a radio interface based on FDMA (radio interface which enables subscriber access by means of subscriber codes), a radio interface based on FDMA (radio interface which enables subscriber access by means of subscriber codes), a radio interface based on FDMA
  • the third message is transmitted to the mobile station as separate signaling or in-band signaling within the information transmission.
  • the separate signaling has the advantage, for example, that signaling messages can be routed more easily to the functional unit that is to process them.
  • the inband signaling has e.g. the advantage that no additional traffic load is generated on the radio interface.
  • the receiving part of the mobile station is easier to implement.
  • a field for the third message is provided in the organizational block within an ATM cell, which consists of an organizational block and a user data block.
  • the correction value is entered in this field.
  • This field advantageously replaces, at least in part, information about a virtual path which is no longer required for transmission via the radio interface.
  • the field contains at least eight bit information for correcting the transmission time of the mobile station, i.e. for synchronization.
  • an ATM cell can be transmitted exactly in one time slot or divided over several time slots. It is also possible to transmit several ATM cells in one time slot.
  • the synchronization described in the exemplary embodiments provides the basis for information transmission starting from several mobile stations at different distances from the base station, without successively transmitted information from different mobile stations canceling one another. The invention is explained in more detail on the basis of exemplary embodiments which refer to the figures.
  • FIG. 2 shows a schematic representation of the information transmission from a mobile station to the ATM network
  • FIG. 3 shows a schematic representation of a cell of a cellular mobile radio network
  • FIG. 4 shows an overview of various synchronization options
  • FIG. 5 shows a schematic illustration of the signaling flow between the base station system and the mobile station
  • FIG. 6 shows a virtual channel with ATM cells allocated to a mobile station
  • FIGS. 8 and 9 representations of the organizational block of an ATM cell for inband signaling
  • FIGS. 10 and 11 representations of the division of ATM cells into time slots of a TDMA radio interface
  • Figure 12 is a definition of the correction value as a time delay due to the signal delay
  • Allocation rate for a mobile station. 1 shows a general scenario with mobile subscribers from mobile radio networks which can be connected either to a switching network PSTN with conventional switching devices or to an ATM (backbone) network with ATM switching devices.
  • a radio interface for information transmission with ATM cells is additionally defined, which results in a WATM (wireless asynchronous transfer mode) radio interface.
  • WATM wireless asynchronous transfer mode
  • the mobile stations MS are consequently also suitable for receiving ATM cells.
  • WATM is used to enable the ATM network to be adapted to the mobility functions.
  • a MAP (mobile application part) is defined in the ATM signaling. 2
  • this MAP is defined in a base station controller BSC, which is connected to at least one base station BTS.
  • the base station controller BSC and the base station BTS form a base station system BSS, which represents the network-side termination of the radio interface.
  • the base station controller BSC is connected to the ATM network via wired channels.
  • a radio interface between the base station BTS and the mobile station MS, via which ATM cells are transmitted in both directions.
  • a synchronization unit S is contained in the base station BTS, which controls the synchronization of the radio interface.
  • a base station BTS supplies a cell within a mobile radio network which forms the radio communication system.
  • Several mobile stations MS can be located within the cell, which can establish a connection via the radio interface to the base station BTS (MOC mobile originated call) or to which a connection can be established (MTC mobile terminated call).
  • the mobile stations MS have an arbitrary distance from the base station BTS within the cell, being within the cell can move freely without breaking the connections to the base station BTS.
  • the cell has a radius of up to a few kilometers, as a result of which the signal propagation times between the mobile stations MS and the base station BTS can vary between almost zero and a few ⁇ s.
  • there are influences of multipath propagation which further exacerbate the problem of different signal propagation times.
  • the differences must be corrected in accordance with the following exemplary embodiments.
  • the ATM cells can either be transmitted directly - the radio interface can be adapted to the size and transmission speed of the ATM cells - or the transmission is carried out via digital mobile radio networks, which either use CDMA (code division multiple access), have an FDMA (frequency division multiple access) or TDMA (time division multiple access) structure.
  • CDMA-based cellular networks are, for example, the IS-95 cellular network or a wideband CDMA cellular network.
  • TDMA-based systems are, for example, GSM (global system for mobile communication), PCS1900 or a TD / CDMA system with joint detection (joint detection).
  • An FDMA system is, for example, a GSM mobile radio network in which a carrier, i.e. one frequency per cell with all time slots, is provided for a WATM transmission.
  • a prerequisite for the information transfer using ATM cells via the Eunkinterface is the definition of the size of the ATM cells, e.g. 53 bytes per ATM cell, and the transmission speed.
  • An ATM cell grid is generally set up.
  • Several mobile stations MS share a virtual path (VP virtual path) or a virtual channel (VC virtual channel) on the radio interface.
  • VP virtual path virtual path
  • VC virtual channel virtual channel
  • identification characters VPI, VCI are provided for the virtual path VP or the virtual channel VC.
  • These identification characters VPI, VCI are entered in an organizational block header of an ATM cell and serve to convey this ATM cell to the addressees.
  • the signaling sequence between the base station system BSS and the mobile station MS is shown in FIG. 5.
  • the base station system BSS sends a first message mesl on an organizational channel of its radio cell via the base station BTS, which is received by the ready-to-receive mobile station MS.
  • a virtual channel VC is thus set up for further signaling messages.
  • the mobile station MS can use this organization channel to coordinate. It is also possible to call the mobile station MS when establishing an MTC connection to the mobile station MS.
  • the mobile station MS sends a second message mes2 with an access message (access burst) if it wishes an outgoing call (MOC) or responds to an incoming call (MTC).
  • the second message mes2 is not in a fixed time related to the first message mesl.
  • a synchronization unit S of the base station BTS determines a reception time tl for the second message mes2 and a correction value korl from the reception time tl. Possibly . the correction value is determined after evaluating several second messages mes2 with increased accuracy.
  • the correction value korl can also be determined in other components of the base station system BSS, for example a synchronization unit S in the base station controller BSC.
  • the determined correction value korl is used to synchronize the information transmission via the radio interface.
  • the base station system BSS allocates a virtual channel VC to the mobile station MS and transmits the correction value to the mobile station MS with a third message mes3.
  • the mobile station MS uses the correction value to carry out the synchronization, i.e. the setting of the transmission time or the transmission times for the information transmission by means of ATM cells via the radio interface.
  • a synchronization unit S in the base station system BSS determines the reception times t 1 of transmitted information from the mobile station MS and continuously determines corrective values. This does not have to be done for every single ATM cell.
  • the intervals between two determinations should, however, depend on the rate of change of the signal propagation time, i.e. be adapted to the position of the mobile station MS.
  • the determined correction values korl are reported to the mobile station MS with third messages mes3 and processed by the latter.
  • the first and second exemplary embodiment have in common that the ATM cell grid in the radio cell on one frequency (direct transmission of ATM cells with its own radio interface). or FDMA) or a participant code (CMDA).
  • the base station BTS controls the time grid of the transmission, ie the delimitation of the ATM cells.
  • a mobile station MS writes its data into the assigned ATM cells according to a predetermined scheme.
  • mini cells according to AAL2 can also be used. This means that an ATM cell does not always contain information from only one mobile station MS, but a second, finer structure is introduced.
  • the distance between the mobile station MS and the base station BTS leads to a non-negligible time shift between the time of transmission and the time of reception t1 of a message.
  • the signal transit time is shown in FIG. 7 and represents the time shift of the time grid in the mobile station MS and the base station BTS. It is here equated with the correction value korl. Any other conversion methods from correction value to the compensation values for the signal runtime can also be used.
  • the transmission time can be set very precisely. If 6 bits are used for the correction value korl, then accuracies as in the GSM mobile radio network can be achieved. This ensures easy adaptation to this network.
  • the VPI can be replaced with inband signaling. This results in an easily manageable change in the design of the information in the organizational block header.
  • the identification information of the virtual path VPI is in one Radio cell is no longer required, since it is usually only evaluated in the switching nodes of an ATM network.
  • FIGS. 8 and 9 show two examples of an ATM cell in which the correction value is entered in the organizational block header.
  • 8-bit correction values replace the identification information of the virtual path VPI. 9 in the base station BTS
  • Information of the identification information of the virtual path VPI is overwritten and additionally 4 bits of the field are used for the identification information of the virtual channel VCI.
  • a cell In the case of direct transmission of ATM cells, a cell is simultaneously a virtual channel VC and a virtual path VP.
  • a radio interface based on CDMA a subscriber code on one frequency is a VC and a VP.
  • a frequency In the case of a radio interface based on FDMA, a frequency is a VC and a VP. A combination of the three cases is possible.
  • the correction value korl is entered in the signaling information of the MAP.
  • the base station BTS transmits on the WATM signaling channel this information to the mobile station MS with each signaling message.
  • either an additional virtual channel VC can be set up between base station BTS and mobile station MS, or every nth ATM cell in the channel for user data transmission is used for signaling.
  • the maximum time interval t of each signaling message is:
  • c propagation speed of the wave in air
  • dt maximum permitted time shift
  • v speed of the moving mobile station MS (e.g. 250 km / h).
  • the correction values can be transmitted using PCS (personal communication system) access network signaling information. This presupposes that the ATM cell transmission takes place via a digital mobile radio network which provides such signaling.
  • PCS personal communication system
  • the mobile station MS calculates from the correction value korl by how many time units the ATM cells have to be sent before a reference time of the base station BTS in order to compensate for the signal delay.
  • the base station BTS receives the ATM cells within the normal time frame.
  • an ATM cell is a virtual channel VC.
  • a subscriber code is on a fre- quenz a VC.
  • a frequency is a VC. A combination of the three cases is possible.
  • the correction value korl is converted into e.g. 8 or 9 defined field of the organizational block header of an ATM cell.
  • the base station BTS thus sends the correction value to the mobile station MS with each ATM cell.
  • the frequency of sending the correction value korl is therefore not critical.
  • the maximum cell expansion smax is defined as in the first exemplary embodiment.
  • the third and fourth exemplary embodiments have a TDMA radio interface in common.
  • a virtual channel VC can be viewed as a superposition over the time grid according to the TDMA scheme.
  • Figures 10 and 11 show the use of ATM cells by a mobile station MS, the remaining cells can be occupied by other mobile stations.
  • Time slot 0 is used for information transmission using ATM cells in accordance with WATM. Depending on the length of the time slots and the permissible transmission speed, either several ATM cells (FIG. 10) are entered in one time slot, one ATM cell is transmitted per time slot (not shown) or one ATM cell is transferred to at least two time slots (FIG. 11) distributed. In addition to time slot 0, further time slots can also be provided for the virtual channel VC. This increases the maximum transmission rate.
  • the correction value korl is a transmission rate n, ie the time interval between two ATM cells usable by the mobile station MS, and the time position m of the virtual one VC channel required within the TDMA grid.
  • the mobile station MS uses two timers.
  • the first timer tml is the timer of the TDMA grid, the second timer tm2 controls the ATM cell grid.
  • the base station BTS set up the virtual channel on time slot 0.
  • the mobile station MS uses the first timer tml to control that the second timer tm.2 continues to count when the time slot 0 has been identified using the first timer tml.
  • the second timer tm2 is initialized.
  • the base station BTS tells the mobile station MS which ATM cell (s) the mobile station MS may occupy.
  • the mobile station MS stops the transmission.
  • the value of the second timer tm2 is buffered and reused later.
  • Mobile station MS the rest of the ATM cell. With the correction value korl, the mobile station MS corrects the second timer tm2.
  • One or more time slots are simultaneously a virtual channel VC and a virtual path VP.
  • n is already provided in WATM.
  • the correction values korl and m are entered in the signaling information of the MAP.
  • the base station BTS sends this information on the WATM signaling channel to the mobile station MS with each signaling message.
  • either an additional virtual channel VC can be set up between base station BTS and mobile station MS, or every nth ATM cell in the channel for user data transmission is used for signaling.
  • the maximum time interval t of each signaling message is:
  • c propagation speed of the wave in air
  • dt maximum permitted time shift
  • v speed of the moving mobile station MS (e.g. 250 km / h).
  • the correction values can be corrected using a PCS (personal communication
  • access network signaling information are transmitted. This presupposes that the ATM cell transmission takes place via a digital mobile radio network which provides such signaling.
  • the mobile station MS calculates by how many time units the ATM cells have to be sent before a reference time of the base station BTS in order to compensate for the signal transit time.
  • the base station BTS receives the ATM cells within the normal time frame.
  • One or more time slots are a virtual channel VC.
  • the correction value korl is converted into e.g. 8 or 9 defined field of the organizational block header of an ATM cell.
  • the base station BTS thus sends the correction value korl to the mobile station MS with each ATM cell, n and m are communicated in a signaling message from the base station BTS to the mobile station MS.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • Astronomy & Astrophysics (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • General Physics & Mathematics (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)
  • Synchronisation In Digital Transmission Systems (AREA)
  • Time-Division Multiplex Systems (AREA)

Abstract

Une station de base envoie un premier message permettant d'initier une configuration de l'interface radio. Une station mobile reçoit ce premier message, sur quoi elle envoie un deuxième message. La station de base détermine un moment de réception pour ce deuxième message et à partir de là une valeur de correction qui est utilisée pour la synchronisation de la transmission d'informations sur l'interface radio. La synchronisation de la transmission des cellules MTA, assortie d'une exploitation optimale des ressources radiotechniques de l'interface radio, permet également de desservir une région éloignée, de manière comparable aux réseaux de radiocommunication mobile publics existant actuellement pour la transmission MTASF.
EP98947304A 1997-07-21 1998-07-17 Procede et systeme de communication radio pour la transmission d'informations au moyen de cellules mta Withdrawn EP0998832A2 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19731205A DE19731205A1 (de) 1997-07-21 1997-07-21 Verfahren und Funk-Kommunikationssystem zur Informationsübertragung mittels ATM-Zellen
DE19731205 1997-07-21
PCT/DE1998/002021 WO1999005880A2 (fr) 1997-07-21 1998-07-17 Procede et systeme de communication radio pour la transmission d'informations au moyen de cellules mta

Publications (1)

Publication Number Publication Date
EP0998832A2 true EP0998832A2 (fr) 2000-05-10

Family

ID=7836362

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98947304A Withdrawn EP0998832A2 (fr) 1997-07-21 1998-07-17 Procede et systeme de communication radio pour la transmission d'informations au moyen de cellules mta

Country Status (9)

Country Link
EP (1) EP0998832A2 (fr)
JP (1) JP2001511632A (fr)
KR (1) KR20010022098A (fr)
CN (1) CN1265259A (fr)
BR (1) BR9811529A (fr)
DE (1) DE19731205A1 (fr)
ID (1) ID24220A (fr)
RU (1) RU2182744C2 (fr)
WO (1) WO1999005880A2 (fr)

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DE19937245A1 (de) 1999-08-06 2001-02-15 Siemens Ag Synchronisierungsverfahren und -system für Taktquellen bei insbesondere paketvermittelnden Kommunikationssystemen
DE10065514A1 (de) * 2000-12-28 2002-07-18 Siemens Ag Verfahren zur Datenübertragung zwischen verschiedenen Einheiten eines Funkkommunikationssystems und dafür eingerichtetes Basisstationssystem und Funkkommunikationssystem
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US8862764B1 (en) 2012-03-16 2014-10-14 Google Inc. Method and Apparatus for providing Media Information to Mobile Devices
RU2696478C1 (ru) * 2018-11-19 2019-08-02 Федеральное государственное бюджетное образовательное учреждение высшего образования "Омский государственный технический университет" Способ позначной синхронизации при передаче дискретных сообщений по декаметровым каналам связи

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SE502168C2 (sv) * 1993-12-29 1995-09-04 Ericsson Telefon Ab L M Förfarande och anordning vid ett radiokommunikationssystem
GB9418749D0 (en) * 1994-09-16 1994-11-02 Ionica L3 Limited Digital telephony
US5568482A (en) * 1994-11-23 1996-10-22 Yurie Systems, Inc. Low speed radio link system and method designed for ATM transport

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CZ301701B6 (cs) * 2000-11-29 2010-05-26 Novartis Ag Lécivo obsahující kyselinu zoledronovou pro ošetrování bolesti

Also Published As

Publication number Publication date
ID24220A (id) 2000-07-13
KR20010022098A (ko) 2001-03-15
BR9811529A (pt) 2000-08-22
CN1265259A (zh) 2000-08-30
DE19731205A1 (de) 1999-01-28
JP2001511632A (ja) 2001-08-14
WO1999005880A3 (fr) 1999-04-08
RU2182744C2 (ru) 2002-05-20
WO1999005880A2 (fr) 1999-02-04

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