WO1999066750A1 - Station de base - Google Patents

Station de base Download PDF

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Publication number
WO1999066750A1
WO1999066750A1 PCT/DE1999/001748 DE9901748W WO9966750A1 WO 1999066750 A1 WO1999066750 A1 WO 1999066750A1 DE 9901748 W DE9901748 W DE 9901748W WO 9966750 A1 WO9966750 A1 WO 9966750A1
Authority
WO
WIPO (PCT)
Prior art keywords
base station
connection
pcm
isdn
signals
Prior art date
Application number
PCT/DE1999/001748
Other languages
German (de)
English (en)
Inventor
Martin Goldberg
Franz Schreib
Peter Spennemann
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
Priority to EP99939329A priority Critical patent/EP1088464A1/fr
Publication of WO1999066750A1 publication Critical patent/WO1999066750A1/fr

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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
    • H04W92/00—Interfaces specially adapted for wireless communication networks
    • H04W92/04—Interfaces between hierarchically different network devices
    • H04W92/12—Interfaces between hierarchically different network devices between access points and access point controllers

Definitions

  • the invention relates to a base station of a radio communication system, in particular a mobile radio or wireless subscriber access network.
  • information such as voice, image information or other data is transmitted with the aid of electromagnetic waves via a radio interface between a transmitting and a receiving radio station, such as a base station or mobile station in the case of a mobile radio system.
  • a transmitting and a receiving radio station such as a base station or mobile station in the case of a mobile radio system.
  • the electromagnetic waves are also emitted
  • Carrier frequencies that lie in the frequency band provided for the respective system.
  • the carrier frequencies are in the range of 900 MHz, 1800 MHz and 1900 MHz.
  • Carrier frequencies in the range of approximately 2000 MHz are provided for future mobile radio systems with CDMA and TD / CDMA transmission methods via the radio interface, such as, for example, the UMTS (Universal Mobile Telecommunication System) or other 3rd generation systems.
  • UMTS Universal Mobile Telecommunication System
  • GSM Global System for Mobile Communication
  • a base station controller via an Abis interface, for example in a ring or star shape, such a structure can be found in particular on pages 122 and 123 of the abovementioned prior art PCM connections that establish a connection between the base station controller and the respective base stations and that have a high data rate of, for example, 2 Mbits / s in the case of a PCM30 connection.
  • Mobile radio systems with a hierarchical radio cell structure are used for the optimal provision of radio resources, especially in metropolitan areas, in places with an above-average traffic volume or also inside buildings.
  • the lowest radio cell levels such as the micro or picocells, each cover only a geographically very limited radio coverage area.
  • these small coverage areas offer only a limited quantity of radio resources.
  • the transmission of the distribution structure of signals known from the abovementioned prior art on a PCM connection originating from the base station controller means, when used in the lower radio cell levels of the hierarchical radio cell structure, a great financial outlay due to high rental costs of the PCM connections and an unsatisfactory one Utilization of the transmission capacity of the PCM connections, since each connected base station has only a limited number of radio channels and, according to the state of the art, only a limited number of base stations can be connected to one PCM connection.
  • the invention is based on the object of specifying a base station which avoids the disadvantages mentioned and enables advantageous use in hierarchical radio cell structures. This object is achieved according to the invention by the features of patent claim 1. Advantageous Events of the invention can be found in the subclaims.
  • the base station of a radio communication system with a PCM connection has a switching device for filtering out signals intended for the base station in each case from the PCM connection and for line-based forwarding of the non-filtered signals of the PCM connection to another Base station of the radio communication system, whereby the PCM connection is led to the switching device.
  • This embodiment advantageously enables the base station connected to the PCM connection to filter out the signals intended for it and to pass on the non-filtered signals of the PCM connection to a further base station, as a result of which a larger number of base stations are connected to the PCM connection can.
  • all base stations arranged on one floor can be supplied with signals via a PCM connection, and thus the available transmission capacity of the PCM connection can be optimally used.
  • the number of interfaces or switching devices in the base station controller is advantageously reduced, since the number of PCM connections outgoing from the base station controller is reduced and by an additional distribution device in or outside the base station controller or the the respective base stations can be disregarded, which also means that the space required and thus the location problems at
  • non-filtered signals are connected via a further PCM forwarded to the other base station.
  • Embodiment advantageously enables the PCM connection to be looped through the base station according to the invention, filtering out the signals intended for it in the switching device.
  • signals that are not filtered are forwarded to the further base station via at least one ISDN SO connection.
  • an inexpensive connection is advantageously made possible for the connection to the further base station, on the one hand greater flexibility in the construction of the radio network through the possibility of connecting a larger number of further base stations and on the other hand through the lower rental costs for due to a lower transmission capacity
  • Trunks for ISDN SO connections which are generally lower than the rental costs for trunks for PCM connections, are achieved.
  • one ISDN-SO connection is sufficient for each carrier, which makes this configuration particularly suitable for use in the lower radio cell structures of a hierarchical radio communication system or in microbase stations.
  • this advantageously allows one or more additional base stations to be connected to the base station in which the switching device is implemented, for example via one or more ISDN SO connections, which reduces line costs and ensures a flexible structure of the radio network structure.
  • signals that are not filtered are forwarded to the further base station via at least one additional ISDN SO connection established by a dial-up connection.
  • This has the particular advantage that dependent Depending on the traffic load on the radio interface, one or more additional carriers can be used for the additional base station by a simple dial-up connection and can be triggered again after use has ended.
  • the additional ISDN SO connection exists, for example, only for the time that it is actually required, and otherwise the further base station only covers the normal traffic volume through a limited number of connections.
  • the switching device converts the non-filtered signals of the PCM connection into signals of the ISDN SO connection or the further ISDN SO * connection and a corresponding conversion of the signals of the ISDN -SO connection or ISDN-SO * connection in signals of the PCM connection through.
  • This embodiment advantageously enables the base station to be connected to further components of the radio communication system, such as the further base station, for example both via a PCM connection and also via an ISDN SO connection and to carry out a conversion into the respective other transmission format to convert both uplink and downlink signals into the format used.
  • FIG. 1 shows a block diagram of a radio communication system, in particular a mobile radio system, in a general representation (prior art)
  • FIG. 2 shows a block diagram of a radio communication system according to the invention with two base stations
  • FIG. 3 shows a block diagram of the radio communication system according to the invention, the base station being connected to the further base station via an ISDN SO connection or via a PCM connection, and
  • FIG. 4 shows a block diagram of the radio communication system according to the invention with several base stations each connected via PCM and permanent and temporary ISDN SO connections.
  • the radio communication system shown by way of example in FIG. 1 corresponds to part of a known GSM mobile radio system. However, the structure can also be transferred to a third generation mobile radio system or an access network system.
  • a radio communication system consists of one or a plurality of switching centers SC which are networked with one another or which provide access to a fixed network PSTN or a mobile radio network PLMN.
  • these exchanges SC 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 BS, which can establish and trigger communication connections to one or more radio stations, such as mobile stations MS, via a radio interface.
  • Each base station BS supplies a geographical area with radio resources.
  • base stations BS each supply one, for example simplified area represented as a hexagon, which is generally referred to as a radio cell.
  • each base station BS supplies one, for example simplified area represented as a hexagon, which is generally referred to as a radio cell.
  • Cells are overlapped so that, for example, a mobile station MS can establish a connection in the overlap area to at least two base stations BS. Together with the base station controller BSC, the base stations form
  • BS a base station system BSS.
  • the base station controller BSC can be implemented as a separate unit or together with a base station BS or other components of the radio communication system.
  • a first base station BS1 which is connected to the base station controller BSC via a PCM connection PCM (a, b), has a switching device SE in addition to the standard components and devices of a base station, such as transceivers, which are not shown in FIG on.
  • This switching device SE serves to filter out the signals a intended for the first base station BS1.
  • the non-filtered signals b of the PCM connection PCM (a, b) are forwarded to a second base station BS2, which is given by way of example, and these, for example, also have a switching device SE according to the invention and can switch signals to one or more further base stations.
  • the signal transmission between the respective base stations can also take place, for example, via a PCM connection.
  • a PCM connection can, for example, be designed as a PCM30 connection as used in the GSM mobile radio system. This has a bandwidth of 2Mbit / s. Signals transmitted by the radio interface of each carrier for one direction are network-side with a data rate of 2 * 64 kbit / s transmitted via the PCM30 connection, whereby a maximum of 15 carriers can be supplied. Theoretically, it is therefore possible to implement a series connection of up to 15 base stations BS with one carrier each. Depending on the number of carriers used, each base station BS is assigned one or more time slots within the PCM30 connection - the base stations BS are addressed by this mostly rigid allocation, since each base station BS knows the time slots assigned to it and can thus filter out signals transmitted to it . These features can be transferred in the same way to PCM24 connections, which can supply a maximum of 12 carriers due to their smaller bandwidth.
  • a series connection of base stations BS by switching through the PCM connection PCM which corresponds in principle to looping through, as corresponds to a first alternative in FIG. 3, is not always inexpensive and easy to implement in radio communication systems with a hierarchical radio cell structure.
  • a device for distributing the individual PCM connections PCM must be provided in or outside the base station controller BSC, which means that additional space is required.
  • the first base station BS1 is connected to the central base station controller BSC via a PCM connection PCM (a, b).
  • the switching device SE in the first base station BS1 filters the tuned signals a out of the PCM connection PCM (a, b) and converts the unfiltered signals b into signals from ISDN-SO connections ISDN-SO (b).
  • the further, second base station BS2 is connected to the first base station BS1 via one or more ISDN-SO connections ISDN-SO.
  • the switching device SE or the first base station BS1 and the second base station BS2 each have connection options for an ISDN SO connection.
  • the switching device SE if there is a connection possibility for an ISDN SO connection, enables the first base station BS1 to be connected to the base station controller BSC or further base stations BS both via a PCM and via an ISDN SO connection can.
  • a connection to the respective base stations that is very flexible and matched to the respective requirements can be selected. It is also conceivable that a base station is connected to the base station controller BSC via several ISDN SO connections and, for example, an ISDN SO connection is forwarded to the further base station without a conversion according to the invention having to be carried out.
  • the second alternative embodiment in FIG. 3 has a particularly advantageous effect on network planning.
  • several base stations BS on one or more floors can be equipped with a switching device SE according to the invention and connected to the base station controller BSC via a single PCM connection PCM.
  • Each equipped with an SE switching device Base station BS can each have several further base stations
  • ISDN-SO connections ISDN-SO.
  • a combination of a star and a series connection of base stations BS is conceivable and an optimal arrangement of the base stations BS is guaranteed almost without regard to connecting lines.
  • This also has a positive effect that generally ISDN-SO connections ISDN-SO are already physically available almost everywhere compared to PCM connections PCM.
  • the number of connections required for PCM connections and the associated internal switching logic in the base station controller BSC is advantageously reduced.
  • ISDN-SO connections have the advantage that on the one hand the transmission capacity of 144 kbit / s is sufficient for the transmission of signals from a carrier, and on the other hand the fees for renting the connection are much lower than those of a PCM connection is.
  • An ISDN-SO connection is generally referred to as a basic connection to identify the interface used.
  • the physical interface can also be a UKO interface. This has the advantage that further distances between two devices connected via the connection are made possible, in which case the connection is usually established via the UKO interface and the fixed network.
  • a pure ISDN-SO connection can generally only be used up to a maximum distance of one kilometer, which is sufficient, however, especially when used in picocell areas such as high-rise buildings.
  • An operator of radio communication systems generally endeavors to have the lowest possible cost factor for the provision of line connections in order to be able to offer low-cost tariffs for the users of the radio communication system.
  • Another advantage of the ISDN SO connections is that they can be easily set up and triggered over normal dial-up connections if required.
  • one or more additional carriers can be switched on to increase the supply capacity, provided that the respective base station BS has the appropriate facilities and components for using this carrier. This is useful, for example, for sporting events where there is usually an increased traffic load for only a few hours a week or a few days a year, since the costs of permanently maintaining a connection are advantageously eliminated and only have to be taken over when there is a current need .
  • FIG. 4 shows a further exemplary embodiment of the invention with the features described above.
  • a first base station BS1 is connected to the base station controller BSC via a PCM connection PCM (a, b, c, d, e, f).
  • the switching device SE implemented in the first base station BS1 filters the signals a intended for the first base station BS1 out of the PCM connection PCM (a, b, c, d, e, f). It also converts signals b, c from the PCM connection PCM (a, b, c, d, e, f) into signals b, c for two ISDN-SO connections ISDN-SO (b) and ISDN-SO * ( c) and switches this on to the second base station BS2.
  • the second additionally specified ISDN-SO connection ISDN-SO * (c) is - as is shown by the dashed line - only a temporarily switched ISDN-SO connection to the second base station BS2, and, as described above, is only required built and triggered to achieve a local increase in transmission capacity.
  • the switching device SE switches in the first
  • Base station BS1 the further, unfiltered or converted signals d, e, f via a further PCM connection PCM (d, e, f) to a third base station BS3, which also has a switching device SE.
  • the switching device SE of the third base station BS3 filters, as it were, the signals d intended for it from the PCM connection PCM (d, e, f) and also converts the further unfiltered signals e, f into signals of two ISDN SO connections ISDN -SO (e) and ISDN-SO (f) and switches them to a fourth BS4 and fifth base station BS5.
  • 4 shows the advantageous combination possibility of series and star connections of base stations BS of the radio communication system.
  • connection devices are used to connect one or more PCM or ISDN SO connections, manual or automatic detection or setting of the connection type used in each case by the switching device SE being conceivable.
  • the operator or the radio network planner can connect the base station BS to be connected, as required, either via a PCM connection or via an ISDN SO connection, in order to achieve a needs-based distribution of resources for the wired connections and the radio carriers, and at the same time reduce the cost of operating the system.
  • the BISON integrated circuit known from the earlier German patent applications DE 19808495.1 and DE 19808498.6 can be used as the switching device SE.

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

Abstract

L'invention concerne une station de base d'un système de radiocommunication comportant au moins une liaison MIC, caractérisée en ce que cette liaison MIC est raccordée à un système de commutation pour la filtration des signaux provenant de cette liaison et destinés respectivement à la station de base, et pour la retransmission par ligne des signaux non filtrés de la liaison MIC à une autre station de base du système de radiocommunication.
PCT/DE1999/001748 1998-06-17 1999-06-15 Station de base WO1999066750A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP99939329A EP1088464A1 (fr) 1998-06-17 1999-06-15 Station de base

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE1998127027 DE19827027C2 (de) 1998-06-17 1998-06-17 Basisstation
DE19827027.5 1998-06-17

Publications (1)

Publication Number Publication Date
WO1999066750A1 true WO1999066750A1 (fr) 1999-12-23

Family

ID=7871190

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE1999/001748 WO1999066750A1 (fr) 1998-06-17 1999-06-15 Station de base

Country Status (4)

Country Link
EP (1) EP1088464A1 (fr)
CN (1) CN1114329C (fr)
DE (1) DE19827027C2 (fr)
WO (1) WO1999066750A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1994022245A1 (fr) * 1993-03-23 1994-09-29 Telefonaktiebolaget Lm Ericsson Montage en cascade de microbases
WO1995023463A1 (fr) * 1994-02-25 1995-08-31 Telefonaktiebolaget Lm Ericsson Station de base decentralisee pour reduire les imperatifs de largeur de bande pour des communications vers et depuis des emetteurs-recepteurs radio dans un reseau de telecommunications
WO1997028664A1 (fr) * 1996-01-29 1997-08-07 Nokia Telecommunications Oy Transmission vocale dans un reseau de communication mobile
US5678178A (en) * 1992-06-30 1997-10-14 Nokia Telecommunications Oy SDH network having dynamic allocation of transmission capacity

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3411013A1 (de) * 1984-03-24 1985-09-26 Standard Elektrik Lorenz Ag, 7000 Stuttgart Nachrichtenuebertragungssystem
FI108100B (fi) * 1993-06-23 2001-11-15 Nokia Networks Oy Tiedonsiirtomenetelmä ja tiedonsiirtojärjestelmä solukkoradioverkossa
EP0690641A3 (fr) * 1994-06-30 1999-02-10 Siemens Aktiengesellschaft Système de radio mobile
DE19636196C1 (de) * 1996-09-06 1998-02-05 Lucent Tech Network Sys Gmbh Funksystem und Verfahren zu dessen Betrieb

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5678178A (en) * 1992-06-30 1997-10-14 Nokia Telecommunications Oy SDH network having dynamic allocation of transmission capacity
WO1994022245A1 (fr) * 1993-03-23 1994-09-29 Telefonaktiebolaget Lm Ericsson Montage en cascade de microbases
WO1995023463A1 (fr) * 1994-02-25 1995-08-31 Telefonaktiebolaget Lm Ericsson Station de base decentralisee pour reduire les imperatifs de largeur de bande pour des communications vers et depuis des emetteurs-recepteurs radio dans un reseau de telecommunications
WO1997028664A1 (fr) * 1996-01-29 1997-08-07 Nokia Telecommunications Oy Transmission vocale dans un reseau de communication mobile

Also Published As

Publication number Publication date
DE19827027A1 (de) 2000-01-13
CN1114329C (zh) 2003-07-09
DE19827027C2 (de) 2000-05-18
CN1314061A (zh) 2001-09-19
EP1088464A1 (fr) 2001-04-04

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