EP1002434A2 - Installation de transmission de donnees dans des reseaux radiotelephoniques mobiles - Google Patents

Installation de transmission de donnees dans des reseaux radiotelephoniques mobiles

Info

Publication number
EP1002434A2
EP1002434A2 EP98947332A EP98947332A EP1002434A2 EP 1002434 A2 EP1002434 A2 EP 1002434A2 EP 98947332 A EP98947332 A EP 98947332A EP 98947332 A EP98947332 A EP 98947332A EP 1002434 A2 EP1002434 A2 EP 1002434A2
Authority
EP
European Patent Office
Prior art keywords
transmission
gsm
data
channel
signals
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Withdrawn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
EP98947332A
Other languages
German (de)
English (en)
Inventor
Stefan Bahrenburg
Christoph Euscher
Tobias Weber
Paul Walter Baier
Jürgen Mayer
Johannes Schlee
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 EP1002434A2 publication Critical patent/EP1002434A2/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • H04W88/08—Access point devices
    • 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
    • H04W88/02—Terminal devices
    • H04W88/06—Terminal devices adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals

Definitions

  • the invention relates to a device for data transmission in mobile radio networks, in particular base stations and mobile stations in mobile radio networks with TDMA and / or TD / CDMA radio interface.
  • messages for example voice, image information or other data
  • the electromagnetic waves are emitted at carrier frequencies that lie in the frequency band provided for the respective system.
  • GSM Global System for Mobile Communication
  • the carrier frequencies are in the range of 900, 1800 and 1900 MHz.
  • UMTS Universal Mobile Telecommunication System
  • 3rd generation systems frequencies in the frequency band of approx. 2000 MHz are provided.
  • the emitted electromagnetic waves are attenuated due to losses due to reflection, diffraction and radiation due to the curvature of the earth and the like. As a result, the reception power that is available at the receiving radio station decreases. This damping is location-dependent and also time-dependent for moving radio stations.
  • a radio communication system which uses CDMA subscriber separation (CDMA code division multiple access), the radio interface additionally having a time division multiplex subscriber separation (TDMA time division multiple access). It therefore becomes a TD / CDMA transmission method for the radio interface used.
  • CDMA subscriber separation CDMA code division multiple access
  • TDMA time division multiple access time division multiplex subscriber separation
  • JD method JD joint detection
  • the radio communication system shown here is a candidate for a system of the third generation of mobile communications.
  • GSM mobile communications
  • 3rd generation of mobile communications will again require considerable investments for network operators if network elements such as mobile switching centers, base station controllers or base stations have to be replaced or additionally installed. Significant development expenditure is also required from the manufacturers of the infrastructure and mobile stations.
  • the invention is based on the object of specifying a device for data transmission in a mobile radio network which supports TD / CDMA transmission and can be produced economically. This object is achieved by the device with the features of patent claim 1. Advantageous further developments can be found in the subclaims.
  • the device for data transmission in mobile radio networks is used for radio transmission as part of a TDMA and / or as part of a TD / CDMA transmission method.
  • the device contains: control means for controlling the device,
  • At least one RF part for processing high-frequency transmit and receive signals
  • At least one channel estimator for evaluating the received signals with regard to their transmission channel
  • At least one modulator for modulating the transmission signals
  • At least one signal filter and / or one HF part is used jointly for both transmission methods.
  • Such a device for data transmission which provides modulators, channel estimators and data estimators for both transmission methods (TDMA and TD / CDMA), but uses common components - signal filter and / or HF part in common - increases the acceptance of new mobile radio networks and reduces development expenditure , because previously used components can be taken over.
  • the device for data transmission contains a means for power regulation, by means of which the transmission power of the transmission signals is regulated for both transmission methods. Furthermore, it is advantageous to equip the device with at least one block encoder / decoder for additional coding of signaling information.
  • the control means can be designed in such a way that the received signaling information is evaluated and the signaling information to be sent is processed for both transmission methods.
  • Signaling algorithms, signaling mechanisms, synchronization and algorithms for power control can be adopted by the GSM mobile network. Adjustments for a TD / CDMA transmission are only necessary in the transmission method for the data via the radio interface.
  • its HF part consists of a receiving part and a transmitting part. It is not necessary to redesign the RF section, just a modification that takes into account the larger bandwidth of the transmit and receive signals.
  • the higher bandwidth is to be taken into account in the receiving section for signal amplification, filtering and transmission in the baseband and in the transmitting section for signal amplification, filtering and transmission in the high-frequency transmission band.
  • the implementation of these components is can work together with a digital signal processing device that enables easy updating of the components.
  • the program components are advantageously structured in such a way that they can be at least partially replaced by new program components transmitted from the mobile radio network or can be switched to the respective other transmission method by new parameters.
  • a software update is thus possible by exchanging or supplementing program components, so that, for example, a mobile station can adapt to the current network environment.
  • the digital signal processing only needs to be expanded to include the algorithms for joint detection for the transmission layer. Higher layers (layer 2, ..) advantageously remain unaffected.
  • FIG. 1 shows a block diagram of a mobile radio network
  • 2 to 5 show different combinations of mobile stations and base stations and their ability to support TDMA and TD / CDMA transmission methods
  • 7 shows a block diagram of the device for data transmission
  • 8 shows a block diagram of the HF part of the transmitter of the device
  • FIG. 11 shows a detailed block diagram of the receiver of the device
  • FIG. 12 shows a block diagram of the signal processing means with program components.
  • the structure of the radio communication system shown in FIG. 1 corresponds to a known GSM mobile radio network which consists of a multiplicity of mobile switching centers MSC which are networked with one another or which provide access to a fixed network PSTN. Furthermore, these mobile switching centers MSC are each connected to at least one base station controller BSC. Each base station controller BSC in turn enables a connection to at least one base station BTS. Such a base station BTS is a radio station which can establish a radio connection to mobile stations MS via a radio interface.
  • a service control unit SCP in the sense of an intelligent network (IN) implements functions for software updates for the mobile radio network or for parts thereof.
  • the radio cells of the corresponding base stations BTS (GSM / UMTS), BTS (GSM), BTS (UMTS) can also overlap.
  • the mobility of the mobile stations MS should not be hindered by the different standards available.
  • a mobile station MS that only supports the GSM standard can continue to establish a radio connection to a base station BTS of the GSM standard (FIG. 2).
  • the mobile station MS can also be supplied by a base station BTS which supports both standards (UMTS, GSM) (FIG. 5).
  • a mobile station MS that supports both standards can communicate with a GSM base station BTS (GSM) as well as with a base station BTS that only allows TD / CDMA transmission or both transmission methods.
  • GSM GSM base station BTS
  • Such a mobile station MS is a device for data transmission according to the invention.
  • a base station BTS, which supports TD / CDMA or both transmission methods, is also a device according to the invention.
  • 6 shows how loading program modules P1 'to P9' replaces or supplements the existing program modules in the sense of a software update or a parameter setting.
  • the subscriber of the mobile station MS specifies a call request (MOC) or a connection to the MobilStation MS (MTC) is requested and the mobile station does not yet have one the necessary program modules Pl 'to P9' for processing the signals in accordance with the available standard, this is reported to the service control unit SCP, which then overwrites the program modules Pl 'to P9' of the mobile station MS or a switchover to the corresponding modules Performs parameter update.
  • a broadcast service or an individual transmission can be selected.
  • the base station BTS which does not have the necessary program modules or parameters P1 'to P9'.
  • the base station BTS can also load the necessary program modules P1 'to P9' from the service control unit SCP.
  • the connection can be established.
  • An alternative way of downloading the software is to store the program modules P1 'to P9' in the base station BTS and from there to make them available to the requesting mobile stations MS.
  • the service control unit SCP offers the subscriber this in the form of a menu or a table, possibly supplemented by information on costs and the required storage capacity.
  • the subscriber can then make the selection of the standard via the input means of the mobile station MS.
  • the program modules P1 'to P9' programs, data and / or parameters belonging to the selected standard are then transmitted from the service control device SCP to the mobile station MS.
  • a device for data transmission is shown in Fig. 7, with a division into a digital part, the is realized by digital signal processing means DSP, and an HF part, which consists of a transmitting part HF-S and a receiving part HF-E, is made.
  • the transmitting part HF-S and the receiving part HF-E are connected to a common antenna device A.
  • the transmission path of the digital signal processing consists of a convolutional encoder FC for channel coding of user data and signaling data which were previously block-coded in a block encoder BC.
  • the data is then scrambled in an interleaver I and, depending on the transmission standard, fed to a modulator GSM-MOD for GSM modulation or a modulator JD-MOD for TD / CDMA modulation.
  • a first switching device UM1 which, like a second switching device UM2 shown later, is controlled by a control device SE, connects the selected modulator GSM-MOD or JD-MOD with a digital transmission filter SF and further with the transmission part HF-S.
  • a means LR for regulating the transmission power controls the transmission power for transmission signals tx in accordance with the specifications of the control means SE.
  • received signals rx received by the antenna device A are processed in the receiving part HF-E and fed to the digital signal processing.
  • a digital reception filter EF filters the broadband reception signals rx and outputs the signals via the second switching means UM2 to a channel estimator, which is either a channel estimator GSM-KS according to the GSM standard or a channel estimator JD-KS according to the TD / CDMA standard. After the channel estimation, the signals are sent to the respective data estimator
  • GSM-D or JD-D supplied which perform the data detection.
  • a deinterleaver DI the data from both paths are again descrambled and then fed to a folding decoder FD for channel decoding.
  • Signaling information is fed to a block decoder BD, which decodes this data to the control means SE.
  • the control means SE forwards the signaling data to be transmitted or received into the transmission or reception path and establishes the connection to a human-machine interface MMI (keyboard, screen) at a mobile station MS or to network-side signaling channels at the base station BTS ago.
  • MMI human-machine interface
  • the 8 contains a digital / analog converter D / A for real and imaginary parts, first analog transmit filter FS1 for low-pass filtering of the signals in the baseband, a first mixer MSI for converting the transmit signals tx into the transmit frequency band, and one Power amplifier PA for amplifying the transmission signals tx.
  • a first analog reception filter EF1 contains a first analog reception filter EF1, a reception amplifier RPA for measuring and amplifying the reception signals rx, a second mixer MS2 for converting the reception signals rx into the baseband (several mixing stages can also be used), second analog receive filter EF2 and finally an analog / digital converter A / D for real and imaginary parts, which generates digital receive signals rx which can be processed in the digital signal processing means DSP.
  • the transmission path of the device is shown in detail in FIG. 10. It is shown in the usual description form for modeling and simulating a communications system, in which the dependency between different functions and the system structure is shown.
  • the data from a first data source Q1 are transmitted via a user data channel TCH, the data from a second data source Q2 via a signaling channel SACCH or FACCH.
  • the reception path of the device in detail.
  • the reception signals rx are converted from the transmission frequency band into the low-pass range and the splitting into a real and an imaginary component.
  • Analog sub-pass filtering is carried out in sub-module E2 and, in sub-module E3, a double oversampling of the received signal with 13/3 MHz and a word length of 12 bits is carried out.
  • sub-module E4 digital low-pass filtering is carried out using a filter with a bandwidth of 13/6 MHz with the highest possible slope for channel separation. This is followed by a 2: 1 decimation of the double oversampled signal in sub-module E4.
  • the received signal e obtained in this way essentially consists of two parts, namely a part em for the channel Estimate and from parts el and e2 for data estimation.
  • sub-module E8 the calculation of the cross-correlation matrix A A takes place. Since A A has a töplitz structure, only a small part of the matrix has to be calculated here, which can then be used to expand to the full size.
  • Cholesky decomposes A A into H H, where H is an upper triangular matrix. Due to the pottery structure of A A, H also has an approximate pottery structure and does not have to be fully calculated.
  • a vector s represents the reciprocal of the diagonal elements of H, which can be used to advantage in solving equations.
  • Sub-module E13 the estimated data dl / 2 are demodulated, descrambled and finally fold-decoded using a Viterbi decoder.
  • the decoded data blocks d E13 are either fed to a first data sink D1 or via the source decoder E14 to a second data sink D2.
  • Source decoding is necessary for data blocks that were transmitted via SACCH or FACCH signaling channels.
  • Fig. 12 shows the device for data transmission, the HF part HF-S and HF-E is pronounced according to Fig. 7 and the digital signal processing means DSP in addition to one or more digital signal processors - not shown - several program modules Pl to stored in a memory P9 contains.
  • program modules Pl to P9 represent the components of the digital signal filters P8, P9, the channel estimator P6, the modulators P4, the control means Pl, the data estimator P6, the channel encoder / decoder P2, P3 and block encoder / decoder P2, P3.
  • the program modules P1 to P9 in particular the program modules P4 and P6 for modulation, channel and data estimation, can be supplemented by program modules P4 'and P ⁇ ', which then also enable transmission with the respective other standard .
  • the device for data transmission BTS, MS presented in the exemplary embodiments for a mobile radio network with a combination of FDMA, TDMA and CDMA is suitable for requirements on 3rd generation systems. In particular, it is suitable for implementation in existing GSM mobile radio networks, for which only a small amount of change is required.
  • the design of dual-mode mobile stations MS, which function both according to the GSM standard and according to the presented TD / CDMA standard, is facilitated.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne une installation de transmission de données utilisée dans des réseaux radiotéléphoniques mobiles pour une radiotransmission selon un procédé de transmission AMRT et/ou AMCR/AMRT. L'installation comprend des moyens de commande, un élément HF, des filtres de signaux, des éléments d'estimation de canaux, des modulateurs, au moins un élément de commutation commandé par les moyens de commande et servant à la commutation entre les procédés de transmission, des éléments d'estimation de données, et des codeurs/décodeurs de canaux. Selon l'invention, au moins un filtre de signalisation et/ou un élément HF sont utilisés en commun pour les deux procédés de transmission.
EP98947332A 1997-08-05 1998-07-24 Installation de transmission de donnees dans des reseaux radiotelephoniques mobiles Withdrawn EP1002434A2 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19733860 1997-08-05
DE19733860A DE19733860A1 (de) 1997-08-05 1997-08-05 Einrichtung zur Datenübertragung in Mobilfunknetzen
PCT/DE1998/002090 WO1999008407A2 (fr) 1997-08-05 1998-07-24 Installation de transmission de donnees dans des reseaux radiotelephoniques mobiles

Publications (1)

Publication Number Publication Date
EP1002434A2 true EP1002434A2 (fr) 2000-05-24

Family

ID=7838061

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98947332A Withdrawn EP1002434A2 (fr) 1997-08-05 1998-07-24 Installation de transmission de donnees dans des reseaux radiotelephoniques mobiles

Country Status (6)

Country Link
EP (1) EP1002434A2 (fr)
JP (1) JP2001512952A (fr)
CN (1) CN1143574C (fr)
AU (1) AU9430998A (fr)
DE (1) DE19733860A1 (fr)
WO (1) WO1999008407A2 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19851309C1 (de) * 1998-11-06 2000-07-06 Siemens Ag Verfahren zur Datenübertragung in einem Funk-Kommunikationssystem über eine Funkschnittstelle zwischen einer Basisstation und Teilnehmerstation
GB0024705D0 (en) 2000-10-09 2000-11-22 Nokia Networks Oy Communication system
WO2002032160A2 (fr) 2000-10-09 2002-04-18 Nokia Corporation Priorites des services dans un reseau multicellulaire
US7230936B2 (en) * 2001-12-14 2007-06-12 Qualcomm Incorporated System and method for data packet transport in hybrid wireless communication system
DE10355643B4 (de) * 2003-11-28 2006-04-20 Infineon Technologies Ag Mobilstation zum Verarbeiten von Signalen des GSM- und des TD-SCDMA-Funkstandards

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2992670B2 (ja) * 1994-01-31 1999-12-20 松下電器産業株式会社 移動体通信装置
US5592480A (en) * 1995-03-13 1997-01-07 Carney; Ronald R. Wideband wireless basestation making use of time division multiple-access bus having selectable number of time slots and frame synchronization to support different modulation standards
DE19549148A1 (de) * 1995-12-29 1997-07-03 Siemens Ag Verfahren und Anordnung zur Funkübertragung von digitalen Signalen

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9908407A3 *

Also Published As

Publication number Publication date
DE19733860A1 (de) 1999-02-11
CN1266596A (zh) 2000-09-13
AU9430998A (en) 1999-03-01
CN1143574C (zh) 2004-03-24
WO1999008407A3 (fr) 1999-04-15
JP2001512952A (ja) 2001-08-28
WO1999008407A2 (fr) 1999-02-18

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