EP1095531A1 - Systeme de telecommunication mobile - Google Patents

Systeme de telecommunication mobile

Info

Publication number
EP1095531A1
EP1095531A1 EP99933434A EP99933434A EP1095531A1 EP 1095531 A1 EP1095531 A1 EP 1095531A1 EP 99933434 A EP99933434 A EP 99933434A EP 99933434 A EP99933434 A EP 99933434A EP 1095531 A1 EP1095531 A1 EP 1095531A1
Authority
EP
European Patent Office
Prior art keywords
lobe
signal strength
base station
received signal
dfu
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Withdrawn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
EP99933434A
Other languages
German (de)
English (en)
Inventor
Per-Göran ANDERMO
Anders ÖSTERBERG
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.)
Radio Design Innovation TJ AB
Original Assignee
Radio Design Innovation TJ AB
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 Radio Design Innovation TJ AB filed Critical Radio Design Innovation TJ AB
Publication of EP1095531A1 publication Critical patent/EP1095531A1/fr
Withdrawn legal-status Critical Current

Links

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

Definitions

  • the present invention relates to a method and an arrangement in a mobile telecommunication system using lobes for establishing and maintaining a radio channel between a mobile station (MS) and a base station (BS).
  • MS mobile station
  • BS base station
  • narrow lobes are generated by a lobe shaping unit (LSU). These narrow lobes are directed towards mobile stations.
  • LSU lobe shaping unit
  • the object of the invention is to find the initial direction of a mobile terminal, detect the initial signalling, establish and maintain a connection between the base station and the mobile station. This object is achieved by means of a method and an arrangement according to claims 1 and 9, respectively.
  • Figure 1 discloses the construction of the lobe shaping system including the Direction Finding Unit according to the invention.
  • the base station (BS) of the present invention also includes a Direction Finding Unit (DFU) and lobe shaping units (LSU).
  • DFU Direction Finding Unit
  • LSU lobe shaping units
  • the RSSI-records, RSSI and fast scanning switch of figure 1 constitute the DFU.
  • the MTX constitutes the interface to the fixed public or private network, e.g. POTS, ISDN.
  • the MTX is considered to be the most complex part of the mobile communication system, and all final decisions regarding handover, roaming, call set up etc. emanates from the MTX.
  • the TRX is connected to a lobe shaping unit (LSU) which in turn is connected to an antenna array.
  • the lobe shaping unit (LSU) is arranged to form lobes with different widths and gains in arbitrary directions in both uplink and downlink by altering phase- and amplitude coefficients.
  • the lobe shaping unit is described in detail in pending patent applications, assigned to Radio Design Innovation TJ AB, which applications are incorporated herein by reference.
  • the above localisation is achieved by allocating narrow antenna lobes (using LSU and an antenna array) covering the whole area inside a sector.
  • the DFU simultaneously or preferably sequentially scans all receiving lobes. Upon detection of received signal strength in one or a multitude of the receiving lobes the lobe with highest signal strength is selected and the BSC establishes a configured lobe in the direction of the selected lobe for communication between the MS and a TRX.
  • the MS. before sending signals to the BS must identify the BS. This is achieved by the BS transmitting identification signals in a wide lobe in order to inform MS, covered by said wide lobe, about its existence.
  • the BSC Upon receiving a CC, TCfree or TCho activation order (MTX sends order to a TRX-unit), the BSC activates the DFU.
  • a wide lobe in the LSU is connected to the transmitter for the down link contact (paging) with the mobile station MS.
  • the DFU is set to correct channel number and monitors the received signal in the uplink in narrow lobes.
  • the MS activates its transmitter as response to the paging to set up a MS initiated call on a new frequency after e.g. a handover order.
  • Power starts to ramp up and before frame data is transmitted, the DFU must have identified the lobe with strongest RF-level. By scanning through the narrow lobes, the DFU will find the lobe with the strongest received signal strength. This narrow lobe is selected.
  • the BSC sets up a path through the equipment with the selected lobe connected to the receiver.
  • the DFU measures RSS and keeps a record of each lobe.
  • the BSC reads the RSSI records from the DFU and connects continuously the best lobe to the receiver.
  • the BSC reads the RSSI record from the DFU and decides which lobe is best to use for transmitter part and connects the best lobe in that direction to the transmitter, i.e. the down-link wide lobe is transformed into a narrow lobe.
  • the DFU measures RSSI and the BSC continuously connects the best lobe to receiver and transmitter.
  • the mobile station is paged using a wide lobe in the down link, but the base station listens in the up link using narrow lobes scanned through possible directions.
  • narrowing the up-link lobe from e.g. 60° to 10-18°, typically 15°, the antenna gain in the base station increases a factor of approx. 4-5 (6-7 dB).
  • the base station may transmit in the down link with sufficient power in a wide lobe during call set-up or handover etc.,since the base station is not so sensitive with respect to the power consumption.
  • a similar method as above is used for signal strength measurements.
  • the responsibility for the SSM function is to connect a SR unit (or channel unit) to the best lobe so that signal strength measurements can be performed by the SR unit, on the best lobe.
  • the RSSI measurements are initiated from the MTX.
  • the SSM function uses the same hardware configuration as the DFU function.
  • a function scheme for the SSM function is described below. 1.
  • the BSC Upon receiving a measurement activation order (MTX sends order to a TRX or SR unit), the BSC activates the DFU and the DFU is set to correct channel number and monitors the received signal.
  • MTX sends order to a TRX or SR unit
  • the DFU identifies the lobe with the strongest RF-level.
  • the BSC sets up a path through the equipment with the selected lobe connected to the SR.
  • SR performs RSSI and ⁇ tone measurements.
  • NMT Nordic Mobile Telephone
  • quality of a call is controlled by a control signal ( ⁇ tone) i.e. one of four tones around 4kHz.
  • the base station transmits the ⁇ signal to the mobile station which returns the signal to the base station.
  • the quality of the returned ⁇ signal is measured in the base station and if the quality is below a predetermined value the base station transmits an alarm to an MTX.
  • the MTX orders the base station and surrounding base stations to measure the strength of the radio signal from the mobile station.
  • the base stations send the measurement results to the MTX, after which the MTX connects the call to the base station with highest received signal strength.
  • the DFU monitors the received signal and the BSC continuously connects the best lobe to the SR. After the RX is ready BSC disconnects SR equipment.

Landscapes

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

Abstract

L'invention concerne un procédé et un dispositif pour système de télécommunication mobile, utilisant des lobes pour établir et maintenir un canal radio entre une station mobile et une station de base. La station de base mesure l'intensité ou la qualité du signal reçu dans chaque lobe d'un secteur au moyen d'une unité radiogoniométrique. L'unité radiogoniométrique sélectionne le lobe présentant l'intensité ou la qualité du signal reçu la plus élevée et connecte le dispositif de réception de la station de base à la station mobile en utilisant le lobe sélectionné.
EP99933434A 1998-07-03 1999-07-02 Systeme de telecommunication mobile Withdrawn EP1095531A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
SE9802387A SE514663C2 (sv) 1998-07-03 1998-07-03 Mobiltelekommunikationssystem
SE9802387 1998-07-03
PCT/SE1999/001213 WO2000002405A1 (fr) 1998-07-03 1999-07-02 Systeme de telecommunication mobile

Publications (1)

Publication Number Publication Date
EP1095531A1 true EP1095531A1 (fr) 2001-05-02

Family

ID=20411950

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99933434A Withdrawn EP1095531A1 (fr) 1998-07-03 1999-07-02 Systeme de telecommunication mobile

Country Status (5)

Country Link
EP (1) EP1095531A1 (fr)
AU (1) AU4949199A (fr)
IL (1) IL140662A0 (fr)
SE (1) SE514663C2 (fr)
WO (1) WO2000002405A1 (fr)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TW351886B (en) * 1993-09-27 1999-02-01 Ericsson Telefon Ab L M Using two classes of channels with different capacity
FI107851B (fi) * 1996-05-22 2001-10-15 Nokia Networks Oy Menetelmä antennikeilan valitsemiseksi, tukiasema ja solukkoradiojärjestelmä
US5890067A (en) * 1996-06-26 1999-03-30 Bnr Inc. Multi-beam antenna arrays for base stations in which the channel follows the mobile unit

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO0002405A1 *

Also Published As

Publication number Publication date
SE514663C2 (sv) 2001-04-02
AU4949199A (en) 2000-01-24
WO2000002405A1 (fr) 2000-01-13
IL140662A0 (en) 2002-02-10
SE9802387L (sv) 2000-01-04
SE9802387D0 (sv) 1998-07-03

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