EP1112667A1 - Procede et systeme de radiocommunication pour mettre a disposition un canal d'organisation - Google Patents

Procede et systeme de radiocommunication pour mettre a disposition un canal d'organisation

Info

Publication number
EP1112667A1
EP1112667A1 EP99969206A EP99969206A EP1112667A1 EP 1112667 A1 EP1112667 A1 EP 1112667A1 EP 99969206 A EP99969206 A EP 99969206A EP 99969206 A EP99969206 A EP 99969206A EP 1112667 A1 EP1112667 A1 EP 1112667A1
Authority
EP
European Patent Office
Prior art keywords
synchronization
channel
sequence
synchronization sequences
channels
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Withdrawn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
EP99969206A
Other languages
German (de)
English (en)
Inventor
Meik Kottkamp
Michael Färber
Volker Sommer
Michael Benz
Anja Klein
Armin Sitte
Thomas Ulrich
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 EP1112667A1 publication Critical patent/EP1112667A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/001—Synchronization between nodes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/0055—Synchronisation arrangements determining timing error of reception due to propagation delay
    • H04W56/0065—Synchronisation arrangements determining timing error of reception due to propagation delay using measurement of signal travel time
    • H04W56/007—Open loop measurement
    • H04W56/0075—Open loop measurement based on arrival time vs. expected arrival time
    • H04W56/0085—Open loop measurement based on arrival time vs. expected arrival time detecting a given structure in the signal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W92/00—Interfaces specially adapted for wireless communication networks
    • H04W92/04—Interfaces between hierarchically different network devices
    • H04W92/10—Interfaces between hierarchically different network devices between terminal device and access point, i.e. wireless air interface

Definitions

  • the invention relates to a method and a radio communication system for providing an organizational channel, in particular within a mobile radio system with broadband channels and TDD or FDD transmission mode.
  • radio communication systems messages (for example voice, image information or other data) are transmitted with the aid of electromagnetic waves via a radio interface.
  • the radio interface relates to a connection between a base station and subscriber stations, it being possible for the subscriber stations to be mobile stations or fixed radio stations.
  • the electromagnetic waves are emitted at carrier frequencies that lie in the frequency band provided for the respective system.
  • UMTS Universal Mobile Telecommunication System
  • 3rd generation systems frequencies in the frequency band of approx. 2000 MHz are provided.
  • Two modes are provided for the third mobile radio generation, one mode being FDD operation (frequency division duplex), see ETSI STC SMG2 UMTS-Ll, Tdoc SMG2 UMTS-Ll 221/98, dated August 25, 1998, and the other mode a TDD operation (time division duplex), see DE 198 27 700.
  • the operating modes are used in different frequency bands and use both time slots.
  • a method for providing an organizational channel is known from the GSM mobile radio system (global system for mobile communications), which method defines a channel in a predetermined frequency band for transmitting the organizational information. Only a limited amount of organizational information can be transmitted via this one channel, which is sufficient for signaling to the voice services in the GSM mobile radio system.
  • GSM mobile radio system global system for mobile communications
  • the invention has for its object to provide a method and a radio communication system with which greater flexibility in the provision of an organizational channel is achieved. This object is achieved by the method with the features of claim 1 and the radio communication system with the features of claim 14. Advantageous further developments can be found in the subclaims.
  • a channel or a plurality of channels are assigned to a base station for the transmission of organizational information, which form the organizational channel. This allows the data rate of the organizational channel to be varied.
  • At least one synchronization sequence is transmitted by the base station, the channel or channels of the organization channel corresponding to the selection of one or more synchronization sequences and / or the sequence of several synchronization sequences.
  • a subscriber station receives the at least one synchronization sequence and determines the configuration of the organization channel on the basis of the recognized synchronization sequence denoting the channel or channels and / or the recognized sequence of several synchronization sequences.
  • the organization channel can be adapted to the individual needs of the individual radio cells and also over time according to the services offered. The flexibility of providing organizational information via the organizational channel is therefore much greater.
  • the configuration of the organization channel in TDD mode is advantageously designated by the number, the time slots used within a frame structure and / or the spread codes used for the channels. In FDD mode, this is a combination of scrambling code and the channelization code. This information can be complete or refer to parameters that are already known throughout the system.
  • the capacity of the organizational channel can be adapted to the subscriber stations, e.g. Additional spreading codes are assigned to an already assigned time slot and / or additional time slots with a spreading code as channels within the organization channel and the assignment is signaled with the aid of the synchronization sequences. If the required capacity is reduced, the assignment r is canceled, as a result of which the capacity is expanded with the channels which have become free for the user data transmission.
  • a high coding gain is achieved if the coding of the configuration of the organizational channel is determined by the choice and / or the sequence of the synchronization sequences extends over several time slots or several frames. For example, 17 variants of the second synchronization sequence are used and the sequence of eight transmissions of the second
  • the synchronization sequences are advantageously unmodulated orthogonal gold codes. So the synchronization procedure of FDD operation hardly needs to be modified.
  • the synchronization method is particularly suitable for radio communication systems in which the time slots are part of a TDD transmission scheme with broadband channels. Here, several time slots per frame can be used to signal the configuration of the organization channel. Use in FDD mode is also possible. For multimode subscriber stations, parts of the detection device can thus be used for both modes.
  • the synchronization sequences are sent in m time slots, with which additional organizational information of the organization channel is transmitted. This means that only a small number of time slots have to be waited (from the base station to the The degree of freedom of the asymmetry of both transmission directions is hardly restricted. In order to keep the interference on the other channels caused by the synchronization sequences low, these are transmitted with other transmissions of the base station, for example the organizational information of lower power this disadvantage is easily compensated for.
  • two synchronization sequences are advantageously in one time slot Posted.
  • the first synchronization sequence is used to Be ⁇ mood of the reception timing and Grobsynchroni- tion.
  • the sequence of the second synchronization sequences over several transmissions encodes the organization channel and possibly further information such as a time offset of the transmission within the time slot.
  • a time interval between the two synchronization sequences is specified in a time slot. This makes it possible to use a single, switchable filter to detect both synchronization sequences.
  • the second synchronization sequence can also be sent before the first, so the time interval is negative. Further information can be encoded in the temporal ratio of the first to the second synchronization sequence. If two different filters are used, the two sequences can also be sent simultaneously. With two synchronization sequences separated in time, the interfering interferences are better distributed over time, so that fewer burst-like interferences arise.
  • the further information relates to a frame synchronization as well as midambles and spreading codes used by the base station in TDD mode or in FDD mode the code group used by the base station (scrambling code).
  • 1 shows a radio communication system
  • 2 shows a schematic representation of a TDD radio interface between base station and subscriber stations
  • FIG. 5 shows a flowchart for the synchronization and the determination of the configuration of the organizational channel.
  • the mobile radio system shown in FIG. 1 as an example of a radio communication system 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 provided with at least one device RNC for controlling the base stations BS and for allocating radio resources, i.e. a radio resource manager. Each of these devices RNC in turn enables a connection to at least one base station BS.
  • a base station BS can connect via a radio interface to a subscriber station, e.g. Build mobile stations MS or other mobile and stationary devices.
  • the subscriber stations MS contain synchronization means SYNC for synchronization and evaluation means AUS for detection and evaluation of the signals received by the base station BS.
  • At least one radio cell is formed by each base station BS.
  • connection VI, V2, V3 for the transmission of useful information and signaling information between mobile stations MS and a base station BS and an organization channel BCCH as a point-to-multipoint connection.
  • Organizational information oi is transmitted in the organization channel BCCH and can be evaluated for all subscriber stations MS and contains information about the services offered in the radio cell and about the configuration of the channel of the radio interface.
  • An operations and maintenance center OMC implements control and maintenance functions for the mobile radio system or for parts thereof. 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 a TDD radio transmission is shown in FIG. 2.
  • a TDMA component time division multiple access
  • a division of time slots ts of the same duration for example 16 time slots tsO to tsl5.
  • a frequency band extends over a frequency range B.
  • Some of the time slots are used in the downward direction DL and some of the time slots are used in the upward direction UL.
  • An asymmetry ratio of 3: 1 in favor of the downward direction DL is shown as an example.
  • the frequency band for the upward direction UL corresponds to the frequency band for the downward direction DL.
  • the same is repeated for other carrier frequencies. Due to the variable allocation of the time slots ts for upward or downward direction UL, DL, diverse asymmetrical resource allocations can be made.
  • Information of several connections is transmitted in radio blocks within the time slots ts.
  • the data d are spread individually for each connection with a fine structure, a spreading code c, so that, for example, n connections can be separated at the receiving end by this CDMA component (code division multiple access).
  • the spreading of individual symbols of the data d causes Tsym Q chips of the duration T c ⁇ p to be transmitted within the symbol duration.
  • the Q chips form the connection-specific spreading code c.
  • a channel K1, K2, K3, K4 is designated within a frequency band B by a time slot ts, a spreading code c and thus implicitly a spreading factor.
  • the dimension of the time slot ts is missing in the FDD mode.
  • the successive time slots ts are structured according to a frame structure. So 16 time slots ts are combined into a frame for.
  • two time slots ts0, ts8 are used for synchronization, for example.
  • two synchronization sequences cp are sent in a time slot ts8, separated by a time interval tgap.
  • the separation of the two synchronization sequences cp it has the advantage of reduced interference, since the interference power of both sequences is better distributed over time.
  • the first synchronization sequence cp is the same in every time slot tsO, ts8.
  • the second synchronization sequence it can be re-selected from time slot tsO to time slot ts ⁇ .
  • the choice and sequence of the second synchronization sequence corresponds to a time offset toff with which the transmission of the first synchronization sequence cp is delayed with respect to the start of the time slot ts8.
  • the receiving subscriber station MS can determine the time offset toff and take it into account in the synchronization.
  • Neighboring base stations BS are frame-synchronized in TDD mode. According to the invention, neighboring base stations BS are assigned a different time offset toff for the transmission of the synchronization sequences. For example,
  • the further information relates to the frame synchronization, midambles used by the base station, spreading codes (the midambles and spreading codes are assigned independently of one another) and information on the configuration of an organization channel BCCH.
  • the frame start after detection of the synchronization is m one time slot ts still inaccurate by a factor of two.
  • the frame synchronization is consequently easily brought about by a certain sequence of second synchronization sequences.
  • the later detection of information from the organization channel BCCH is accelerated if middle messages, spreading codes and configuration information are already transmitted during the synchronization.
  • any channels K1, K2, K3, K4 denoted by spreading code c and time slot ts can also be signaled beyond the number four.
  • the information about the time slots ts or the spreading codes c is superfluous. Possibly.
  • other parameters for channels K1, K2, K3, K4 of the organizational channel BCCH must be signaled.
  • the data rate of the BCCH organizational channel can be adapted to the cell-specific requirements in accordance with the services offered there. This will enable future modifications to the BCCH organizational channel.
  • the parameters (number of channels, time slots and spreading codes) of the Organi ⁇ sationskanals BCCH must therefore not be pre-set system-wide fixed, but the synchronization can be communicated while.
  • additional channels with organizational information by means of the further information from the synchronization.
  • organizational information can also be temporarily sent in m additional channels.
  • the organizational channel BCCH is sent in parallel to other user data connections, but with a larger error protection coding if necessary.
  • the transmissions of the organization channel BCCH and the synchronization sequences cp are preferably located in the same time slot ts, as a result of which only two time slots tsO, ts8 have to be reserved continuously for the downlink DL.
  • the adjustability of the asymmetry is only slightly restricted.
  • the asymmetry ratios in the system are such that more than two time slots ts0, ts8 are used for the downward direction DL, organizational information can also be transmitted in the remaining time slots ts assigned to the downward direction DL. It is then also possible to transmit the organizational information only in time slots ts in which the synchronization sequences cp, es are not sent. This further reduces the interference on the user data connections.
  • the flexibility of the BCCH organizational channel offers additional advantages, e.g. a distribution over several time slots makes the transmission more robust against interference.
  • the use of a multicode transmission in the organization channel BCCH (several spreading codes c per time slot ts) within a time slot ts enables an adaptive increase in the data rate of the organization channel BCCH. The same can also be achieved by reducing the spreading factor, which is also communicated by the choice and sequence of the synchronization sequences.
  • the choice of the time slots ts for transmitting the organizational information can be made by a higher-level entity, e.g. a radio resource manager RNC, for several base stations BS are coordinated.
  • a control device for example the radio resource manager RNC of a base station system of time slots tsO, ts8 for the synchronization, of channels K1, K2, K3, K4 of the organization channel and of different time offsets toff with respect to the beginning of the time slot tsO, ts8 for sending the synchronization sequences cp
  • the synchronization is preceded by the first step 1 .
  • a plurality of base stations BS send the synchronization sequences cp, it in the predetermined order, which is individual for each base station BS and corresponds to the time offset toff.
  • a subscriber station MS receives the synchronization sequences cp, and carries out a rough synchronization on the basis of the first synchronization sequence cp.
  • the time slot synchronization to the beginning of the time slot ts is possible, whereupon the frame synchronization is also carried out in a fifth step 5 by evaluating the further information.
  • Steps 3 to 5 are carried out by synchronization means SYNC assigned to the subscriber station, which, for example, represent a signal processing processor and correlators formed by signal-adapted filters.
  • a sixth step 6 the configuration of the organization channel BCCH is determined on the basis of the further information in the evaluation means AUS formed by a signal processor, and the preparation for the reception of the organization channel BCCH is initiated.

Abstract

Selon l'invention, un ou plusieurs canaux formant le canal d'organisation sont affectés à une station de base pour la transmission d'informations d'organisation. Il est ainsi possible de faire varier le débit binaire du canal d'organisation. La station de base envoie au moins une séquence de synchronisation, le ou les canaux du canal d'organisation correspondant à la sélection d'une ou plusieurs séquences de synchronisation et/ou d'une succession de plusieurs séquences de synchronisation. Un poste d'abonné reçoit la ou les séquences de synchronisation et détermine la configuration du canal d'organisation sur la base de la séquence de synchronisation reconnue, servant à repérer le ou les canaux. Plusieurs variantes d'une seule séquence de synchronisation et/ou l'ordre dans lequel sont envoyées différentes séquences de synchronisation par exemple peuvent servir à indiquer la configuration du canal d'organisation. Il est ainsi possible, dès la phase de synchronisation et avec un faible investissement supplémentaire, de signaler la présence d'un canal d'organisation évolutif.
EP99969206A 1998-09-10 1999-09-10 Procede et systeme de radiocommunication pour mettre a disposition un canal d'organisation Withdrawn EP1112667A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19841464 1998-09-10
DE1998141464 DE19841464C2 (de) 1998-09-10 1998-09-10 Verfahren und Funk-Kommunikationssystem zum Bereitstellen eines Organisationskanals
PCT/DE1999/002893 WO2000016575A1 (fr) 1998-09-10 1999-09-10 Procede et systeme de radiocommunication pour mettre a disposition un canal d'organisation

Publications (1)

Publication Number Publication Date
EP1112667A1 true EP1112667A1 (fr) 2001-07-04

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP99969206A Withdrawn EP1112667A1 (fr) 1998-09-10 1999-09-10 Procede et systeme de radiocommunication pour mettre a disposition un canal d'organisation

Country Status (4)

Country Link
EP (1) EP1112667A1 (fr)
AU (1) AU1149700A (fr)
DE (1) DE19841464C2 (fr)
WO (1) WO2000016575A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10021820A1 (de) * 2000-05-04 2001-11-15 Siemens Ag Verfahren zur Signalübertragung in einem Funk-Kommunikationssystem

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3527330A1 (de) * 1985-07-31 1987-02-05 Philips Patentverwaltung Digitales funkuebertragungssystem mit verbindungsbegleitenden organisationskanal im zeitmultiplexrahmen
US5042082A (en) * 1989-06-26 1991-08-20 Telefonaktiebolaget L. M. Ericsson Mobile assisted handoff
US5404355A (en) * 1992-10-05 1995-04-04 Ericsson Ge Mobile Communications, Inc. Method for transmitting broadcast information in a digital control channel
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
DE19629899C1 (de) * 1996-07-24 1997-08-21 Nokia Mobile Phones Ltd TDD-Verfahren zwischen einer Basisstation und wenigstens einer Mobilstation

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO0016575A1 *

Also Published As

Publication number Publication date
WO2000016575A1 (fr) 2000-03-23
DE19841464C2 (de) 2002-03-14
DE19841464A1 (de) 2000-04-06
AU1149700A (en) 2000-04-03

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