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WO1999060707A2 - Procede et station de base pour transmettre des signaux dans un canal d'organisation d'un systeme de radiotelecommunication - Google Patents

Procede et station de base pour transmettre des signaux dans un canal d'organisation d'un systeme de radiotelecommunication Download PDF

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Publication number
WO1999060707A2
WO1999060707A2 PCT/DE1999/001304 DE9901304W WO9960707A2 WO 1999060707 A2 WO1999060707 A2 WO 1999060707A2 DE 9901304 W DE9901304 W DE 9901304W WO 9960707 A2 WO9960707 A2 WO 9960707A2
Authority
WO
WIPO (PCT)
Prior art keywords
information
channel
bcch
signal
organizational
Prior art date
Application number
PCT/DE1999/001304
Other languages
German (de)
English (en)
Other versions
WO1999060707A3 (fr
Inventor
Stefan Bahrenburg
Paul Walter Baier
Jürgen Mayer
Johannes Schlee
Tobias Weber
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
Publication of WO1999060707A2 publication Critical patent/WO1999060707A2/fr
Publication of WO1999060707A3 publication Critical patent/WO1999060707A3/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
    • H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
    • H04B7/2628—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile using code-division multiple access [CDMA] or spread spectrum multiple access [SSMA]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J13/00—Code division multiplex systems
    • H04J13/0003—Code application, i.e. aspects relating to how codes are applied to form multiplexed channels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
    • H04W48/12—Access restriction or access information delivery, e.g. discovery data delivery using downlink control channel

Definitions

  • the invention relates to a method and a base station for signal transmission in an organizational channel of a radio communication system, in particular m mobile radio systems with TD / CDMA subscriber separation.
  • information 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.
  • UMTS Universal Mobile Telecommunications System
  • 3rd generation systems frequencies in the frequency band of approx. 2000 MHz are provided.
  • a channel impulse response as an example of the representation of the channel properties describes such a multi-way channel.
  • the determined by a mobile station for the signals m Abwarts ⁇ direction of training sequences channel characteristics are needed for the detection signal equalization and coordinating the data.
  • GSM global system for mobile communications
  • sationskanals provided.
  • a radio block is only sent with organizational information.
  • a method is known from DE 198 10 285 for connecting the transmission of information of an organizational channel with further information, for example useful information or signaling information, in a radio communication system.
  • further information for example useful information or signaling information
  • the invention is therefore based on the object of improving the signal transmission while simultaneously transmitting information from an organizational channel and further information. This object is achieved by the method with the features of claim 1 and the base station with the features of claim 10. Further developments of the invention can be found in the subclaims.
  • information from an organizational channel is transmitted from a base station to mobile stations at the same time as further information according to a CDMA transmission method.
  • Signal forms of the information of the organizational channel and the further information are at least temporarily coordinated with one another.
  • a signal form is selected for the information of the organizational channel, which is adapted to the signal form during the duration of the transmission of m the further information embedded training sequences. This in turn results in a composite signal form which is predictable on the receiving side and which can assume the function of a training sequence.
  • the signal shapes differ only by a factor or the signal shapes are formed by the same chip sequences. This hardly influences the channel estimation on the receiving side, since the channel impulse response may be falsified by a real multiplicative factor, but this has no consequences for a subsequent data estimation. If a JD method (] o ⁇ nt detection) is used for data estimation, see DE 41 21 356 AI, this factor can be compensated for without any problems due to the near / far resistance of the method.
  • the waveform of the organization channel information is used as a training sequence, i.e. a part of this signal form replaces the training sequences otherwise sent for the further information.
  • An organization channel is particularly easy to evaluate if the information of the organization channel is sent with constant performance. This simplifies the selection of a base station for establishing a connection or a handover procedure between base stations.
  • the method according to the invention can advantageously be integrated into radio communication systems which, in addition to the CDMA transmission method, use TDMA subscriber separation.
  • the organization channel is then advantageously set up only in some time slots.
  • TDD transmission systems time division duplex
  • continuous organizational channel can be provided.
  • the coexistence of information from the organizational channel with other information is important for spectral efficiency in broadband frequency channels.
  • FIG. 1 shows a block diagram of a radio communication system
  • FIG. 2 shows a schematic representation of the frame structure of a TDD transmission method
  • FIG. 3 4 signal forms for information of the organization channel and for further information
  • FIG. 5 shows a block diagram of a base station.
  • the radio communication system shown in FIG. 1 consists of a large number 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 device RNM for allocating radio resources. Each of these devices RNM in turn enables a connection to at least one base station BS. Such a base station BS can connect to other radio stations, e.g. Build mobile stations MS or other mobile and stationary devices. At least one radio cell is formed by each base station BS.
  • connection VI for the transmission of useful information ni and signaling information si between mobile stations MSI, MS2, MSk and one Base station BS and an organization channel BCCH, which represented a point-to-multipoint connection.
  • An operation and maintenance center OMC implements control and maintenance functions for the cellular network or for parts of it. The functionality of this structure can be transferred to other radio communication systems in which the invention can be used, in particular for subscriber access networks with a wireless subscriber line.
  • the frame structure of the radio transmission is shown in FIG 2.
  • the frequency range B forms a frequency channel.
  • Part of the time slots ts0 to ts9 is used in the downward direction DL and part of the time slots ts10 to tsl5 is used in the upward direction UL.
  • the frequency channel for the upward direction UL corresponds to the frequency channel for the downward direction DL.
  • An organization channel BCCH is set up in the first time slot tsO.
  • a mobile station decides on a frequency band and detects the signals of the associated base station received in the corresponding time slot ts. Consequently, there is a constant switch between monitoring the organization channel BCCH of the own base station BS, with which the mobile station is currently maintaining a radio connection, and the organization channel BCCH of neighboring base stations BS.
  • This further information consists of sections with data d, in which training sequences tseql to tseqn known at the receiving end are embedded.
  • the data d are connection-specific with a fine structure, a subscriber code c, spread so that, for example, n connections can be separated at the receiving end by this CDMA component.
  • the spreading of individual symbols of the data d has the effect that within the symbol duration T sym Q chips of the duration T ch i p are transmitted, which result in a specific signal form.
  • the Q chips form the connection-specific subscriber code c.
  • a protection time gp is provided within the time slot ts to compensate for different signal delays of the connections.
  • the successive time slots ts are structured according to a frame structure. So 16 time slots ts are combined into a frame for.
  • Chip rate 4096 Mcps
  • Such a TDD transmission method is provided with a combination of ultiplex time slots and code division multiplex for the UMTS radio transmission. These parameters enable the best possible harmonization with an FDD (frequency division duplex) mode for the 3rd generation of mobile communications.
  • FDD frequency division duplex
  • FIG. 3 shows a time slot ts in which information oi of the organizational channel BCCH and further information ni, for example the useful information of a plurality of connections, are simultaneously tmdungen, are transferred.
  • a training sequence tseq is embedded in the useful information ni.
  • An enlarged section shows the signal forms sl, s2 of this information oi, si, which are coordinated with one another for the duration of the training sequence tseq.
  • the chip sequences that form the signal form sl, s2 differ only in one factor.
  • the transmitting power of information oi the organization channel BCCH is constant, the factor that results from individual settings of the amplitude of the two ⁇ th waveform s2.
  • the signal forms sl, s2 superimposed on the transmission side lead to a sum signal ss which is predictable for the duration of the training sequences tseq and can thus be used for channel estimation.
  • the sum signal ss cannot be predicted for the useful signal components, since the information oi, ni to be transmitted of the organization channel or the useful information and thus also the two signal forms sl, s2 are not matched to one another.
  • FIG. 4 An alternative variant is shown in FIG. 4.
  • only the signal form sl of the organization channel BCCH is sent for the duration of the training sequence tseq, which means that it can be used alone as the training sequence tseq.
  • the sum signal ss corresponds to the first signal form sl of the organization channel BCCH during the duration of the training sequence tseq.
  • the dynamic range of the signal portion of the further information is ni m Abwarts ⁇ device 30 dB and the transmission power of the signal component of the organization information oi is ni to 16 dB less than the maximum transmit power of the additional information.
  • the minimum transmission power is chosen for the further information ni, this results in a 14 dB reduction in more powerful signal portion of the organizational information oi.
  • the tuning of the signal forms sl, s2 according to the invention can ensure even in such an unfavorable constellation that the channel estimation can be carried out.
  • a channel estimator according to Steiner see DE 197 34 936, is used for the channel estimation.
  • a JD detection method joint detection
  • This JD detection method known from DE 41 21 356 AI is resistant to larger power differences between the signal components due to the compensation calculation used.
  • base station BS and mobile station MS The structure of base station BS and mobile station MS is shown in a very simplified manner in FIG. Only the components directly involved in carrying out the method according to the invention are mentioned.
  • the compilation of radio blocks with signal parts of the information oi of the organization channel BCCH and the further information ni, si is carried out in a base station BS according to FIG. 5.
  • This consists of a transmission / reception device TRX, which converts transmission signals to be radiated digitally / analogously, converts them from the baseband to the frequency range of the radiation and modulates, amplifies and transmits the transmission signals via an antenna device AE.
  • a device SA for radio block formation has previously compiled the transmission signals in radio blocks and assigned them to the corresponding frequency band and time slot.
  • a signal processing device DSP evaluates signals received via the transmitting / receiving device TRX.
  • the transmission power control of the signal components is carried out by means of a control device SE, the associated data being stored in a memory device MEM.
  • the radio blocks are received in a mobile station MS.
  • the mobile station MS contains a transceiver TRX, in which the received signals are amplified, converted to the baseband and converted to analog / digital.
  • a signal processing device DSP with a channel estimator KS then carries out the channel and data estimation.

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

Abstract

Selon l'invention, des informations d'un canal d'organisation sont transmises simultanément avec d'autres informations selon un procédé de transmission AMCR, entre une station de base et des stations mobiles, des séquences d'apprentissage étant incorporées dans les autres informations. A cet effet, les formes des signaux des informations du canal d'organisation et des autres informations sont adaptées les unes aux autres pendant la durée des séquences d'apprentissage. Les formes des signaux se différencient par un facteur fixe ou bien le canal d'organisation remplace la séquence d'apprentissage. Ce procédé s'utilise notamment dans des systèmes à temps partagé/AMCR.
PCT/DE1999/001304 1998-05-18 1999-05-03 Procede et station de base pour transmettre des signaux dans un canal d'organisation d'un systeme de radiotelecommunication WO1999060707A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19822276.9 1998-05-18
DE1998122276 DE19822276A1 (de) 1998-05-18 1998-05-18 Verfahren und Basisstation zur Signalübertragung in einem Organisationskanal eines Funk-Kommunikationssystems

Publications (2)

Publication Number Publication Date
WO1999060707A2 true WO1999060707A2 (fr) 1999-11-25
WO1999060707A3 WO1999060707A3 (fr) 2002-09-26

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Country Status (2)

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DE (1) DE19822276A1 (fr)
WO (1) WO1999060707A2 (fr)

Cited By (1)

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US7974371B2 (en) 2001-11-13 2011-07-05 Panasonic Corporation Communication method and radio communication apparatus

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DE19852248B4 (de) * 1998-11-12 2004-02-05 Siemens Ag Verfahren und Basisstationsystem asymmetrischen Datenübertragung in einem Mobilfunksystem
DE10008574A1 (de) * 2000-02-24 2001-09-06 Siemens Ag Verfahren zur erneuten Zuweisung von Übertragungskapazitäten durch ein Basisstationssystem eines Kommunikationssystems
DE10009401C2 (de) * 2000-02-28 2003-07-24 Siemens Ag Verfahren, Mobilfunksystem und Station zur Ermittlung einer Vorhaltezeit für eine Verbindung zwischen zwei Stationen
DE10015041C2 (de) * 2000-03-27 2002-08-01 Siemens Ag Verfahren zur Signalisierung des Beginns eines logischen Kanals in einem gemeinsam genutzten physikalischen Übertragungskanal eines Funk-Kommunikationssystems und Vorrichtung zur Durchführung des Verfahrens

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GB9201879D0 (en) * 1992-01-29 1992-03-18 Millicom Holdings Uk Ltd Communication system
TW376601B (en) * 1995-08-01 1999-12-11 Siemens Ag Method and arrangement for reducing common channel interference in radio system with a cellular structure
DE19549148A1 (de) * 1995-12-29 1997-07-03 Siemens Ag Verfahren und Anordnung zur Funkübertragung von digitalen Signalen
DE19608204C2 (de) * 1996-03-04 1998-04-16 Siemens Ag Verfahren und Anordnung zur Übertragung von Informationen über die Funkschnittstelle zwischen einer Teilnehmereinrichtung und einer Netzeinrichtung eines zellularen Mobilfunknetzes
JP3720141B2 (ja) * 1996-10-01 2005-11-24 松下電器産業株式会社 移動体通信方法およびその装置

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US8229026B2 (en) 2001-11-13 2012-07-24 Panasonic Corporation Processor and processing method for signal transmission
US8428182B2 (en) 2001-11-13 2013-04-23 Panasonic Corporation Communication method and radio communication apparatus
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US8744005B2 (en) 2001-11-13 2014-06-03 Panasonic Corporation Method and apparatus for generating modulation signals
US8891678B2 (en) 2001-11-13 2014-11-18 Wi-Fi One, Llc Receiving apparatus and receiving method
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US9628300B2 (en) 2001-11-13 2017-04-18 Wi-Fi One, Llc Method and signal generating apparatus for generating modulation signals
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US10003443B2 (en) 2001-11-13 2018-06-19 Wi-Fi One, Llc Methods and apparatus for transmitting modulation signals
US10033551B2 (en) 2001-11-13 2018-07-24 Panasonic Intellectual Property Corporation Of America Transmission and reception signal processor and method
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US10355841B2 (en) 2001-11-13 2019-07-16 Wi-Fi One, Llc Methods and apparatus for transmitting modulation signals
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US10630443B2 (en) 2001-11-13 2020-04-21 Wi-Fi One, Llc Radio transmission apparatus and methods
US10651993B2 (en) 2001-11-13 2020-05-12 Wi-Fi One, Llc Methods and apparatus for transmitting modulation signals
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Also Published As

Publication number Publication date
WO1999060707A3 (fr) 2002-09-26
DE19822276A1 (de) 1999-12-09

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