EP1027815A2 - Systeme de communication radio et dispositif de commande - Google Patents

Systeme de communication radio et dispositif de commande

Info

Publication number
EP1027815A2
EP1027815A2 EP98962184A EP98962184A EP1027815A2 EP 1027815 A2 EP1027815 A2 EP 1027815A2 EP 98962184 A EP98962184 A EP 98962184A EP 98962184 A EP98962184 A EP 98962184A EP 1027815 A2 EP1027815 A2 EP 1027815A2
Authority
EP
European Patent Office
Prior art keywords
radio
frequency
assigned
cluster
spreading codes
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Withdrawn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
EP98962184A
Other languages
German (de)
English (en)
Inventor
Stefan Bahrenburg
Jürgen Mayer
Johannes Schlee
Paul Walter Baier
Dieter Emmer
Tobias Weber
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 EP1027815A2 publication Critical patent/EP1027815A2/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J13/00—Code division multiplex systems
    • H04J13/16—Code allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/02—Resource partitioning among network components, e.g. reuse partitioning
    • H04W16/12—Fixed resource partitioning
    • 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
    • H04B7/2621—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile using frequency division multiple access [FDMA]
    • 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
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/02—Resource partitioning among network components, e.g. reuse partitioning

Definitions

  • the invention relates to a radio communication system constructed from radio cells, in particular a mobile radio network and a control device.
  • transmission encompasses the processes during transmission and / or reception in the form of point-to-point and / or in the form of point-to-multipoint communication. Transmitting, receiving and / or processing devices are usually used for the transmission.
  • messages for example voice, image information or other data
  • radio communication systems this is done with the aid of electromagnetic waves via a radio interface.
  • the electromagnetic waves are emitted at carrier frequencies that lie in the frequency range provided for the respective system.
  • GSM Global System for Mobile Communication
  • the carrier frequencies are in the range of 900 MHz.
  • UMTS Universal Mobile Telecommunication System
  • 3rd generation systems frequencies in the frequency range 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 interface between a transmitting and a receiving radio station, via which the electronic tromagnetic waves a data transmission takes place.
  • 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).
  • CDMA subscriber separation CDMA code division multiple access
  • TDMA time division multiple access time division multiplex subscriber separation
  • JD Joint Detection
  • at least two data channels can be allocated to a connection via the radio interface, each data channel being distinguishable by an individual spreading code.
  • the data channel is also understood to mean logical channels via which user data can be transmitted.
  • the receiving radio station uses the midambles to estimate the channel impulse responses for different transmission channels. It is also known from the GSM mobile radio network to combine adjacent radio cells into a cluster and to transmit m to the different radio cells m different frequency bands within this cluster.
  • Spread codes can be assigned to CDMA channels in two different ways:
  • a set of fixed spreading codes this has the disadvantage that the CDMA channels to which the same spreading code is assigned are difficult to separate under certain circumstances.
  • the invention is therefore based on the object of specifying a radio communication system and a control device for data transmission with which the capacity utilization of the radio communication system is improved.
  • the invention is therefore based on the idea of carrying out a spreading code planning in such a way that radio cells within which transmission is carried out in the same frequency bands form a subset, and the same spreading codes are not used simultaneously in the radio cells locally adjacent to this subset. So it is possible that a limited number of easily separable spreading codes can be used efficiently.
  • a further development of the invention also provides for corresponding midamble code planning.
  • the result of this is that a limited number of midambles can be allocated efficiently.
  • At least one frequency cluster contains only one radio cell.
  • a radio communication system which is constructed from radio cells, data sequences which are not disjoint in time and frequency and which are transmitted in a radio cell can be distinguished by spread codes assigned to them, each radio cell is assigned a set of spread codes, and a plurality of radio cells are combined to form a code cluster , and the sets of spreading codes assigned simultaneously to the radio cells within a code cluster are different.
  • the radio interface additionally contains a TDMA component.
  • the transmission resources and the code resources can be used even more efficiently and flexibly.
  • FIG. 1 shows a block diagram of a mobile radio network
  • the structure of the radio communication system shown in FIG. 1 corresponds to a known GSM mobile radio network which consists of a large number of mobile switching centers MSC which are networked with one another and which provide access to a fixed network PSTN. Furthermore, these mobile switching each MSC 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 BS.
  • a base station BS is a radio station which can establish a radio connection to mobile radio stations, the mobile stations MS, via a radio interface.
  • a radio cell FZ is essentially defined by the range of the base station.
  • the allocation of resources such as codes and frequency bands to radio cells and thus to the transmitted data sequences can be controlled by control devices such as the base station controller BSC.
  • FIG. 1 shows three radio connections for transmitting useful information ni and signaling information si between three mobile stations MS and a base station BS, one mobile station MS for increasing the data rate two data channels DK1 and DK2 and the other mobile stations MS each a data channel DK3 or DK4 are allocated.
  • 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 is used by the radio communication system according to the invention; however, it can also be transferred to other radio communication systems in which the invention can be used.
  • the base station BS is connected to an antenna device which e.g. consists of three individual emitters. Each of the individual radiators radiates in a sector of the radio cell supplied by the base station BS. However, a larger number of individual radiators (according to adaptive antennas) can alternatively be used, so that spatial subscriber separation using an SDMA method (Space Division Multiple Access) can also be used.
  • an SDMA method Space Division Multiple Access
  • the base station BS provides the mobile stations MS with organizational information about the location area (LA location area) and via the radio cell (radio cell identifier).
  • the organizational information is emitted simultaneously via all individual radiators of the antenna device.
  • connections with the user information ni and signaling information si between the base station BS and the mobile stations MS are subject to multipath propagation, which is caused by reflections, for example, on buildings in addition to the direct propagation path.
  • Directional radiation by certain individual radiators of the antenna device AE results in a greater antenna gain in comparison to the omnidirectional radiation.
  • the quality of the connections is improved by the directional radiation.
  • the multipath propagation together with further interference leads to the signal components of the different propagation paths of a subscriber signal being superimposed on one another in the receiving mobile station MS. Furthermore, it is assumed that the subscriber signals of different base stations BS are superimposed on a frequency channel at the receiving location to form a received signal rx m.
  • the task of a receiving mobile station MS is to detect data symbols d of the useful information ni, signaling information si and data of the organizational information transmitted in the subscriber signals.
  • the frame structure of the radio interface can be seen from FIG. 2.
  • the time range is divided into time slots ts, a sequence of, for example, 8 time slots ts1 to ts ⁇ being combined to form a TDMA frame.
  • the entire frequency range available to a radio communication system is divided into two sub-ranges, one of which is used for the uplmk connections, the which is reserved for downlmk associations.
  • a sequence of time slots of the same time slot number over the TDMA frames of a frequency band and optionally a frequency hopping function form a physical channel.
  • a digital data stream to be transmitted via this physical channel is first modulated.
  • the resulting data symbols are combined into data parts dt consisting of data sequences.
  • the data parts are spread by a spreading code, the CDMA code, i.e. A certain broadband signal form is modulated onto a data sequence.
  • the resulting chip sequences are combined with a midamble and form a radio block
  • the midamble is different for each connection, at least in the uplink.
  • radio blocks are transmitted within the corresponding physical channels.
  • the data sequences of different radio blocks within a physical channel are spread individually with different storage codes, whereby they can be separated in the receiver.
  • a specific physical channel forms a CDMA channel CC together with a specific spreading code.
  • Logical channels such as data channels DK or control channels, are assigned to these CDMA channels according to a certain scheme.
  • FIG. 3 shows such a radio trestle for the transmission of user data from data parts dt with data symbols d, which m cuts are embedded with midambles known at the reception.
  • the data parts dt are spread so that, for example, K data channels DK1, DK2, DK3,... DKK can be separated on the receiving side by this CDMA component.
  • Each of these data channels DK1, DK2, DK3, .. DKK is assigned a specific energy E per symbol on the transmission side.
  • the spreading of individual symbols of the data d with Q chips has the effect that Q sub-sections of the duration Tc are transmitted within the symbol duration Ts.
  • the Q chips form the individual CDMA code.
  • the midamble m consists of L chips, also of the duration Tc.
  • an individual midamble m consisting of L complex chips is used, at least in the uplink.
  • the necessary M different midambles are derived from a basic midamble code of length M * W, where M is the maximum number of subscribers (connections) and W is the expected maximum number of channel coefficients of the channel impulse response.
  • the connection-specific midamble m is derived by rotating to the right of a basic midamble code by W * m chips and periodically stretching to L> (M + 1) * W - 1 chips.
  • a protection time guard of the duration Tg is provided within the time slot ts to compensate for different signal tents of the connections of successive time slots ts.
  • Control channels for example for frequency or time synchronization of the mobile stations MS, are not introduced in every frame, but at predetermined times within a multi-frame.
  • the parameters of the radio interface are, for example, as follows:
  • the parameters can also be set differently in the upward (MS -> BS) (uplink) and downward direction (BS -> MS) (downlink).
  • FIG. 4 shows how a limited number of spreading codes can be efficiently allocated in a cellular mobile radio system by code planning. For example, seven adjacent radio cells FZ represented by hexagons are always combined to form a so-called code cluster KC (in this case, a frequency cluster FC is represented by a radio cell). Within a code cluster, a different set of C1-C7 spreading codes is used in each radio cell. In one embodiment variant, these spreading codes are only used again in radio cells of neighboring code clusters (code reuse).
  • FIG. 5 also shows how a limited number of code codes can be used in a cellular mobile radio system
  • Spreading codes can be allocated efficiently. For example, seven adjacent radio cells FZ represented by hexagons are always combined to form a so-called frequency cluster FC. Within a frequency cluster, a different set of frequency bands F1-F7 is used in each radio cell. Furthermore, for example, seven adjacent frequency clusters FC are always combined to form a code cluster KC. Within a code cluster, a different set of C1-C7 spreading codes is used in each frequency cluster. In one embodiment variant, these spreading codes are only used again in radio cells of adjacent code clusters (code reuse).
  • radio blocks that are not disjunct in time and frequency and transmitted in a first radio cell can be distinguished by different spreading codes assigned to them and / or at least partially by different middle messages assigned by them. These spreading codes and / or midambles are not used simultaneously in second radio cells in which transmission takes place within the same frequency bands as in the first radio cell and which are located in the vicinity of the first radio cell.
  • the spreading codes used in the first radio cell are also used in neighboring radio cells in which transmission takes place within different frequency bands than in the first radio cell.
  • the spreading codes used in the first radio cell are also used in non-adjacent barten radio cells used in which is transmitted within the same frequency bands as in the first radio cell.
  • the allocation of sets of midambles is carried out according to the above-described scheme for the allocation of sets of spreading codes.
  • the formation of the code clusters relating to the midambles can, however, take place independently of the formation of the code clusters relating to the spreading codes, the code clusters not necessarily referring to identical frequency clusters.
  • the sets of spreading codes or middle notes can be generated from a basic code in the radio stations MS, BS or in the control devices BSC, to which the radio stations are assigned.
  • Central control devices OMC and / or decentralized control devices BSC can be used to assign the sets of spreading codes or middle messages to the individual radio cells.
  • Decentralized control units BSC can also be used to allocate the sets of spreading codes or midambles and of frequency and time resources to data channels.
  • the sets of spreading codes or middle messages are queried from memory devices which can be located in the control devices BSC.
  • the allocation of the sets of spreading codes or midambles is performed dynamically by central control devices OMC. Furthermore, it is possible for the sets of spreading codes or middle notes to be predetermined when setting up or expanding the mobile radio system.
  • an embodiment variant can be implemented in which no spread code planning, but only midamble code planning takes place.
  • Another embodiment of the invention provides that only one frequency band is assigned to at least one radio cell FZ.
  • the radio stations MS, BS are provided with joint detection receiving devices, the joint detection method being implemented essentially by digital signal processors.
  • the mobile radio network presented in the exemplary embodiments with a combination of FDMA, TDMA and CDMA is suitable for requirements on 3rd generation systems.
  • it is suitable for an implementation in existing GSM mobile radio networks, for which only a small amount of change is required.

Landscapes

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

Abstract

L'invention concerne un système de communication radio qui est constitué de cellules radio et dans lequel des canaux de données réalisés dans une cellule radio peuvent être différenciés par des codes d'étalement qui leur sont affectés. Un jeu de codes d'étalement est affecté à certaines cellules radio réunies, ce jeu de codes d'étalement se différenciant (réutilisation de code) de jeux de codes d'étalement qui sont utilisés par des cellules radio voisines réunies. Le système de communication radio selon l'invention est particulièrement adapté à une mise en oeuvre dans des réseaux de téléphonie mobile TD/AMCR de la troisième génération.
EP98962184A 1997-10-27 1998-10-27 Systeme de communication radio et dispositif de commande Withdrawn EP1027815A2 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19747380 1997-10-27
DE19747380 1997-10-27
PCT/DE1998/003147 WO1999022475A2 (fr) 1997-10-27 1998-10-27 Systeme de communication radio et dispositif de commande

Publications (1)

Publication Number Publication Date
EP1027815A2 true EP1027815A2 (fr) 2000-08-16

Family

ID=7846737

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98962184A Withdrawn EP1027815A2 (fr) 1997-10-27 1998-10-27 Systeme de communication radio et dispositif de commande

Country Status (6)

Country Link
EP (1) EP1027815A2 (fr)
JP (1) JP2001522163A (fr)
KR (1) KR20010031496A (fr)
CN (1) CN1135881C (fr)
AU (1) AU1748199A (fr)
WO (1) WO1999022475A2 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6765894B1 (en) 1999-07-05 2004-07-20 Matsushita Electric Industrial Co, Ltd. Communication terminal apparatus and base station apparatus
DE60107051T2 (de) * 2000-02-04 2005-12-01 Interdigital Technology Corp., Wilmington Unterstützung von abwärtsstreckenmehrbenutzerdetektion
KR100595636B1 (ko) * 2003-12-22 2006-06-30 엘지전자 주식회사 Ｇｓｍ 단말기의 네트워크 검색 방법
WO2006058562A1 (fr) * 2004-12-01 2006-06-08 Telecom Italia S.P.A. Methode pour attribuer des codes de brouillage dans un reseau de communications mobile cellulaire amrc
FR2891423B1 (fr) * 2005-09-23 2007-11-09 Alcatel Sa Dispositif et procede de traitement de donnees par modulation de jeux de pseudo-codes d'etalement fonction des cellules destinataires des donnees, pour un satellite de communication multi-faisceaux
US8218483B2 (en) * 2006-10-31 2012-07-10 Koninklijke Philips Electronics N.V Method for transmitting data packets using different frequency reuse factors

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3527331A1 (de) * 1985-07-31 1987-02-05 Philips Patentverwaltung Digitales funkuebertragungssystem

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9922475A2 *

Also Published As

Publication number Publication date
JP2001522163A (ja) 2001-11-13
WO1999022475A3 (fr) 1999-07-08
KR20010031496A (ko) 2001-04-16
WO1999022475A2 (fr) 1999-05-06
CN1278395A (zh) 2000-12-27
AU1748199A (en) 1999-05-17
CN1135881C (zh) 2004-01-21

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