EP0713631A1 - Systemes de bornes de distribution radio - Google Patents

Systemes de bornes de distribution radio

Info

Publication number
EP0713631A1
EP0713631A1 EP94923011A EP94923011A EP0713631A1 EP 0713631 A1 EP0713631 A1 EP 0713631A1 EP 94923011 A EP94923011 A EP 94923011A EP 94923011 A EP94923011 A EP 94923011A EP 0713631 A1 EP0713631 A1 EP 0713631A1
Authority
EP
European Patent Office
Prior art keywords
rdp
transceiver
station
rdps
feeder
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Withdrawn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
EP94923011A
Other languages
German (de)
English (en)
Inventor
Robert Joseph Gerard Macnamee
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0713631A1 publication Critical patent/EP0713631A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • H04W16/24—Cell structures
    • H04W16/32—Hierarchical cell structures
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
    • H04B7/0802—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection
    • 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
    • H04B7/2603—Arrangements for wireless physical layer control
    • H04B7/2609—Arrangements for range control, e.g. by using remote antennas
    • 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
    • H04W88/085—Access point devices with remote components

Definitions

  • the present invention relates generally to radio communication systems and in particular to a digital time division multiple access (TDMA) radio communication system which employs multiple cells to provide an adequately large coverage area.
  • TDMA digital time division multiple access
  • TDMA time division multiple access
  • each radio base station The area served by each radio base station is known as a cell.
  • the maximum size of a cell is limited by system parameters such as maximum transmitter power and by the radio propagation conditions in the cell.
  • multiple cells are used.
  • the cells are connected to a central switching station.
  • Each cell typically comprises an antenna, transceiver equipment, control equipment and equipment for communicating with the central switching station.
  • Some known TDMA systems use high gain antennae to increase link gain and to minimise interference from and to adjacent cells. Because such high gain antennae are physically- large and cumbersome, these systems use a single, ⁇ teerable (or scanning) very high gain antenna. During each time slot this is pointed at the appropriate secondar- station.
  • An object of the present invention is to reduce the cost of providing coverage in multi-cell TDMA radio communication systems by allowing a single transceiver to be shared between a plurality of cells.
  • radio distribution port is used to indicate the device which emits and receives radio signals.
  • the RDP will comprise an entire transceiver and antennae assembly. In others it will comprise an antenna only. In others it will ,comprise an antenna and frequency changing means.
  • cable means for connecting a single TDMA transceiver to a plurality of geographically separate RDPs wherein, one at a time, the RDPs are connected to the common transceiver during different timeslots so as to allow secondary stations within the coverage area of an RDP to communicate with the shared transceiver via the RDP antenna during the timeslot allotted to that secondary station.
  • the system in accordance with the present invention comprises a base station transceiver means, signal feeder cable means, a synchronised feeder switching means, radio distribution port means, and secondary stations.
  • the RDPs are located remotely from the transceiver and are connected to it using the feeder cable means.
  • Each operative secondary station (making a call) is located within the coverage area of one of the RDPs and communicates with the TDMA transceiver during the allotted timeslot of that secondary station. Timeslots are allotted to secondary stations at the beginning of a call and at the end of the call are released for use by other secondary stations.
  • the synchronised feeder and switching means connects the appropriate RDP to the transceiver during said timeslot. In the following timeslot a different RDP may be connected to the transceiver, allowing a secondary station in the coverage area of this different RDP to communicate with the transceiver during the timeslot allotted to this secondary station.
  • Each RDP is allotted a unique identity and the transceiver transmits this identity in the signalling channel of calls in progress.
  • the transceiver transmits a "dummy bearer" or "beacon” signal containing the identity of the RDP.
  • This broadcast signal also supplies secondary stations with information on which timeslots are available for use on the respective RDP.
  • Radiocommunication systems often use antenna diversity at the base-station.
  • antenna diversity is provided using a pair of antennae at the RDP and the control signal to select between these two is multiplexed onto the feeder cable or carried on an auxiliary cable.
  • the system may handover the call to the new RDP.
  • Pre-handover measurements may be made either by the secondary station or by the base station transceiver.
  • the signal may be amplified, converted to another radio frequency, or converted to an optical frequency in the case of a fibre optic feeder.
  • Figure la shows a single base station transceiver time division multiplexed between a plurality of RDPs in a star configuration
  • Figure lb shows a single base station transceiver time division multiplexed between a plurality of
  • Figure lc shows a hybrid bus/star configuration
  • Figure Id shows an evolution of Figure lc where additional transceivers have been added in order to increase capacity
  • Figure 2 shows the TDMA duplex frame and time slot structure of the systems and also shows the composition of an individual timeslot
  • Figure 3 shows possible methods of distributing control signals to the RDPs
  • Figure 4 shows transmission amplifiers used in the feeder -cables
  • Figure 5 shows an arrangement for remote control diversity
  • Figure 6 shows frequency changing means at both ends of the feeder cable.
  • the system comprises a TDMA base station transceiver 10 connected via feeder cable means 12 to a plurality of radio distribution ports (RDPs) 14, 16, 18.
  • RDPs radio distribution ports
  • the RDPs are geographically distributed and the coverage area of each may be arranged to be contiguous or partially overlapping with coverage area of adjoining RDPs.
  • the transceiver 10 can communicate via the RDPs 14, 16, 18 with specific secondary stations (e.g. handsets) 20, 22 respectively during specific timeslots allotted to the secondary stations.
  • Figure 2 shows the structure of a frame and of a timeslot.
  • a feeder means and a switching means connect the appropriate RDP to the transceiver via the feeder cable means.
  • Radiocommunication systems often use antenna diversity at the base-station.
  • antenna diversity is provided using a pair of antennae at the RDP and the control signal to select between these two is carried along the feeder cable or on an auxiliary cable.
  • An arrangement for remote control diversity is shown in Figure 5, wherein the base-station diversity switch is referenced 40, the remote diversity switch 42, the feeder cable 43 and the control signal cable means 45.
  • the system may handover the call to the new RDP.
  • Pre-handover measurements may be made either by the secondary station or by the base-station trans ⁇ DCver. The method by which the secondary station effects measurement is well known.
  • the base-station transceiver may make measurements of the signal strength of prospective "new" base-stations during the synchronisation header period of the timeslot, since it is not necessary to receive the entire synch signal on every timeslot.
  • the feeders may be connected in either a star configuration ( Figure la) or a bus configuration ( Figure lb) or in a suitable combination of the two.
  • a star configura ⁇ tion When a star configura ⁇ tion is employed the slot/RDP selection switch 39 may be collocated with the transceiver. Using this configura ⁇ tion it is also possible to use coaxial cable for some branches and to use optical fibre for other branches.
  • the switching function 41 is distributed along the length of the feeder. In this case it is necessary to supply a slot/RDP selection signal along the feeder.
  • a frame synchronisation signal is provided to control the transmit/receive cycle of the transmission amplifiers.
  • the necessary synchronisation may be achieved in a variety of known ways. An example is given later, wherein a timeslot or part timeslot selection signal is provided to each RDP.
  • each RDP may comprise an antenna only. However with long feeder lengths this may prove to be impractical as the signal is greatly attenuated along the feeder between the transceiver and the antenna.
  • at least some of the RDPs may comprise amplifier means 24 and/or frequency changing means 26, as indicated in Figure 6. By changing the frequency at which the signal is transmitted along the feeder cable either to a much lower frequency, e.g. 100 MHz, or to an optical frequency in the case of an optical fibre feeder, the attenuation is reduced.
  • FIG. 4a shows how separate amplifiers 30, 32 may be used for transmit and receive or a single amplifier 34 may be switched to act in both directions.
  • Figure 4b shows how the amplifiers 36, 38 may be inserted at either end of a length of cable so as to maximise noise performance.
  • the feeder may comprise standard fixed lengths, e.g. 3m, 10m, 30m, 100m, which are factory adjusted so that the amplifier gain exactly matches the cable loss.
  • the frame synchronisation signal is produced by a clock circuit 50 and is multiplexed onto the feeder cable in the form of a sine wave. This is then squared and sliced by a clock recovery circuit at the transmission amplifier. This clock recovery circuit has a long time constant to allow other serial data to be multiplexed on without affecting the clock jitter.
  • the RDP/slot selection signal is produced by the circuit means 52 and is modulated serially to each RDP where it is decoded by decoder 46.
  • the frame synchronisation is carried on an auxiliary cable and is receovered by a clock recovery circuit 48.
  • the timeslot/ RDP selection signal is provided on an auxiliary parallel bus, i.e. an n-core auxiliary cable which directly addresses up to 2 RDPs.
  • Another wire pair carries the antenna diversity selection signal.
  • Additional capacity may be added by adding additional transceivers ( Figure Id). This may be accomplished by connecting one of the existing feeders, or a new feeder, to an additional transceiver.

Landscapes

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

Abstract

L'invention se rapporte à un système de radiocommunication destiné plus particulièrement à des combinés radiotéléphoniques mobiles dans un système microcellulaire, dans lequel un simple émetteur-récepteur AMRT (10) se connecte à une pluralité de bornes de distribution radio séparées (14, 16, 18) à une à la fois, dans des tranches de temps diférentes, de manière que des stations secondaires (20, 22), situées dans la zone de couverture d'une borne de distribution radio, puissent communiquer avec l'émetteur-récepteur partagé pendant la tranche de temps qui leur est dévolue.
EP94923011A 1993-08-14 1994-08-04 Systemes de bornes de distribution radio Withdrawn EP0713631A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GB939316951A GB9316951D0 (en) 1993-08-14 1993-08-14 Radio communication systems
GB9316951 1993-08-14
PCT/GB1994/001720 WO1995005722A1 (fr) 1993-08-14 1994-08-04 Systemes de bornes de distribution radio

Publications (1)

Publication Number Publication Date
EP0713631A1 true EP0713631A1 (fr) 1996-05-29

Family

ID=10740516

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94923011A Withdrawn EP0713631A1 (fr) 1993-08-14 1994-08-04 Systemes de bornes de distribution radio

Country Status (4)

Country Link
EP (1) EP0713631A1 (fr)
AU (1) AU7272394A (fr)
GB (1) GB9316951D0 (fr)
WO (1) WO1995005722A1 (fr)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5903834A (en) * 1995-10-06 1999-05-11 Telefonaktiebolaget L/M Ericsson Distributed indoor digital multiple-access cellular telephone system
WO1998000983A2 (fr) * 1996-06-28 1998-01-08 Harris Corporation Ameliorations concernant un procede et un appareil permettant d'utiliser la dualite et systeme de transmission d'informations numeriques
US5838674A (en) * 1996-07-31 1998-11-17 Telefonaktiebolaget L M Ericsson Circuitry and method for time division multiple access communication system
DE19636196C1 (de) * 1996-09-06 1998-02-05 Lucent Tech Network Sys Gmbh Funksystem und Verfahren zu dessen Betrieb
JP3076252B2 (ja) * 1996-11-25 2000-08-14 日本電気株式会社 セルラー移動通信システムにおける多セクター切替制御装置
FR2760925B1 (fr) * 1997-03-11 1999-05-14 France Telecom Dispositif d'amplification bidirectionnelle dans une borne radio deportee
EP0901298A1 (fr) * 1997-09-08 1999-03-10 Alcatel Station de base contrÔlant les communications mises en oeuvre dans une cellule d'un réseau de radiocommunication cellulaire et numérique et procédé de contrÔle correspondant
FR2768288B1 (fr) * 1997-09-08 1999-10-15 Alsthom Cge Alcatel Station de base controlant les communications mises en oeuvre dans une cellule d'un reseau de radio-communication cellulaire et numerique et procede de controle correspondant
SE0302596D0 (sv) 2003-09-30 2003-09-30 Ericsson Telefon Ab L M Improvments in or relating to base stations
ES2550104T3 (es) 2004-10-12 2015-11-04 Telefonaktiebolaget L- M Ericsson (Publ) Comunicación entre un nodo de control de equipo de radio y múltiples nodos de equipo de radio remotos
EP2263415B1 (fr) * 2008-04-07 2018-06-06 Telefonaktiebolaget LM Ericsson (publ) Procédé d un système de transmission radio et d un équipement d accès radio destinés à une transmission radio sans fil cellulaire, et système de transmission radio et équipement d accès radio

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2138652B (en) * 1983-04-23 1986-04-23 Standard Telephones Cables Ltd Distributed pabx
DE3418082C1 (de) * 1984-05-16 1985-10-17 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Anordnung zur Empfängerauswahl in einem Funksystem
GB8826476D0 (en) * 1988-11-11 1988-12-14 British Telecomm Communications system
US5802173A (en) * 1991-01-15 1998-09-01 Rogers Cable Systems Limited Radiotelephony system

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9505722A1 *

Also Published As

Publication number Publication date
WO1995005722A1 (fr) 1995-02-23
AU7272394A (en) 1995-03-14
GB9316951D0 (en) 1993-09-29

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