WO2002103928A1 - Systeme de radiotelephonie - Google Patents

Systeme de radiotelephonie Download PDF

Info

Publication number
WO2002103928A1
WO2002103928A1 PCT/GB2002/002757 GB0202757W WO02103928A1 WO 2002103928 A1 WO2002103928 A1 WO 2002103928A1 GB 0202757 W GB0202757 W GB 0202757W WO 02103928 A1 WO02103928 A1 WO 02103928A1
Authority
WO
WIPO (PCT)
Prior art keywords
signal
station
antennas
transmitter station
quality
Prior art date
Application number
PCT/GB2002/002757
Other languages
English (en)
Inventor
Paul Cook
Original Assignee
Ubinetics Limited
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 Ubinetics Limited filed Critical Ubinetics Limited
Publication of WO2002103928A1 publication Critical patent/WO2002103928A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/38—TPC being performed in particular situations
    • H04W52/42—TPC being performed in particular situations in systems with time, space, frequency or polarisation diversity
    • 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
    • H04B7/10—Polarisation diversity; Directional diversity
    • 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
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0621—Feedback content
    • H04B7/0632—Channel quality parameters, e.g. channel quality indicator [CQI]

Definitions

  • This invention relates to a radiotelephone system, and in particular a radio telephone system comprising a transmitter station and a mobile station.
  • STTD space-time transmitter diversity
  • the present invention provides a radiotelephone system comprising a transmitter station and a mobile station provided with means for receiving a signal transmitted by the transmission station and measurement means for measuring the quality of the received signal, wherein the transmitter station has first and second antennas having different polarisation properties, the transmitter station being arranged to transmit the same signal from each of the antennas.
  • the mobile station is arranged to transmit a signal indicative of the quality or a change in quality to the transmitter station or another station forming part of the system.
  • the two antennas are arranged to transmit signals whose polarisation properties are separated from each other by substantially 90°, and preferably the first antenna is arranged to transmit vertically-polarised signals, and the second antenna is arranged to transmit horizontally-polarised signals.
  • the transmitter station is provided with control means for controlling the power of the signal transmitted by each of the antennas.
  • the control means comprises a controller and first and second attenuators, the output of the first attenuator applied to the first antenna, and the output of the second attenuator being applied to the second antenna.
  • the controller may be arranged to apply signals to the input of the two attenuators that are substantially twice the power of the signal to be transmitted by the transmitter station, and to control each of the attenuators so as to output signals attenuated by substantially 50%.
  • the measurement means comprises means for detecting the signal-to-interference ratio (SIR) of the received signal.
  • the measurement means comprises means for detecting the bit error rate (BER) of the received signal.
  • the measurement means is arranged to use a cyclic redundancy check (CRC).
  • the mobile station further comprises transmission means for transmitting a signal indicative of the measured quality of the received signal to the transmitter station.
  • the controller may be arranged to receive the signal indicative of the measured quality, and to control each of the attenuators to vary the attenuation of their output signals, whilst ensuring that the total power of the signal transmitted by the transmitter station remains substantially constant.
  • the controller is arranged to increase the attenuation of one of the attenuators by a predetermined percentage of the total transmitted power, and to decrease the attenuation of the other attenuator by the same percentage.
  • the invention also provides a method of operating a radio telephone system comprising a transmitter station having first and second antennas with different polarisation properties, and a mobile station provided with means for measuring the quality of a signal received from the transmission station, the method comprising the steps of: a) transmitting the same signal from each of the antennas; b) transmitting a signal from the mobile station to the transmitter station indicative of the measured quality of the signal received by the mobile station; and c) varying the signal subsequently transmitted by the antennas of the transmitter station in dependence upon the received signal indicative of the measured quality.
  • the method further comprises the step of attenuating the signals sent by each of the antennas.
  • the method further comprises the step of varying the attenuation of each of the attenuators in dependence upon the received signal indicative of the measured quality, the variation in attenuation being such that the total power of the signal transmitted by the transmitter station remains substantially constant.
  • FIG. 1 is a schematic diagram of a radiotelephone system embodying the invention.
  • Figure 2 is a schematic diagram of part of a base station of the radiotelephone system of Figure 1.
  • Figure 1 shows a radiotelephone system in the form of a cellular telephone system, the system comprising a base station 10 in two-way communication with a mobile station 11.
  • the base station 10 which constitutes a transmitter station, includes first and second antennas 12 and 13, which are arranged at 90° to one another, so that the first antenna transmits signals with a vertical polarisation, and the second antenna transmits signals with a horizontal polarisation.
  • the antennas 12 and 13 are each connected to base station circuitry, which is shown in Figure 2.
  • Figure 2 shows part of the base station 10 schematically, the base station comprising first and second controllable attenuators 20 and 21, outputs of which are connected to the antennas 12 and 13 respectively, a controller 22 and a processor 23. Operation is as follows.
  • Signals which the base station 10 requires to be transmitted to the mobile station 11 are applied to inputs of the attenuators 20 and 21 via a signal input 24.
  • the power of each of these signals is twice that which is required to be transmitted.
  • the controller 22 controls each of the attenuators 20 and 21 to attenuate the signals received at its input by 50%.
  • the power of the signal transmitted by the first antenna 12 is, therefore, the same as the power transmitted by the second antenna 13.
  • the total power is equal to half of the input power; and is, therefore, the required transmission power.
  • the signal transmitted is one-half vertically polarised and one-half horizontally polarised.
  • the mobile station 11 includes means to measure the quality of the received signal. Quality may be measured by detection of the SIR or the BER, which can be inferred using a CRC, or in any other way.
  • the mobile station 11 then transmits a signal indicative of the measured quality to the base station 10, or to another base station (not shown) forming part of the radiotelephone system.
  • This quality measurement is fed to the processor 23, which applies the measurement to an algorithm.
  • the algorithm is a simple one wherein the mix of the signals transmitted from the antennas 12 and 13 is either increased or decreased by 5% at random.
  • the resulting percentage mix is fed to the controller 22, which controls the attenuators to adopt the appropriate attenuation.
  • the mix may be changed from 50% to 55%, in which case the controller 22 controls the first attenuator 12 to attenuate at 45%, and controls the second attenuator 13 to attenuate at 55%.
  • the total transmitted power is the same, although 55% is vertically polarised and 45%) is horizontally polarised.
  • the mobile station 11 then makes a further quality measurement, and transmits a signal indicative of it to the base station 10. If the processor 23 determines that the quality of the signal received at the mobile station 11 is improved, the above procedure is repeated, although with a starting point of 55%. If the quality remains constant or decreases, the controller 22 controls attenuators to adopt the other possible mix, in this case a 45% mix. Using this algorithm, the base station 10 will tend towards transmitting a mix which gives an optimum or near optimum reception at the mobile station 11 for the given transmitted power.
  • the mobile station 11 may transmit a signal indicative of whether the quality increased following a change in mix, whether it decreased or whether it did not change.
  • a "did not change" condition may be considered as either an increase in quality or a decrease in quality, reducing the number of possible conditions which the mobile station 11 can signal to the base station 10.
  • the polarisation properties of the antennas 12, 13 are separated from each other by 90° in the vertical-horizontal sense. It will be appreciated, however, that other arrangements are also within the scope of the invention, such as an arrangement in which one antenna has generally East- West polarisation and another antenna has generally North-South polarisation. Also, although polarisation separation of 90° or approximately 90° is optimum, the invention can also be performed using greater or lesser degrees of polarisation separation.
  • the integrity of the communications link between the base station 10 and the mobile station 11 of the above embodiment is improved. This results in an increased likelihood of signals being correctly received at the mobile station 11.

Landscapes

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

Abstract

L'invention concerne un système de radiotéléphonie comprenant une station émettrice (10) et une station mobile (11) dotée d'un moyen de réception d'un signal émis par la station émettrice et un moyen de mesure permettant la mesure de la qualité du signal reçu. La station émettrice (10) a une première et une deuxième antenne (12 et 13) ayant différentes propriétés de polarisation. La station émettrice (10) est conçue pour émettre le même signal à partir de chaque antenne (12 et 13).
PCT/GB2002/002757 2001-06-18 2002-06-18 Systeme de radiotelephonie WO2002103928A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0114820A GB2376843B (en) 2001-06-18 2001-06-18 A transmitter station and a radiotelephone system including a transmitter station
GB0114820.4 2001-06-18

Publications (1)

Publication Number Publication Date
WO2002103928A1 true WO2002103928A1 (fr) 2002-12-27

Family

ID=9916818

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2002/002757 WO2002103928A1 (fr) 2001-06-18 2002-06-18 Systeme de radiotelephonie

Country Status (2)

Country Link
GB (1) GB2376843B (fr)
WO (1) WO2002103928A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1394962A1 (fr) * 2002-08-27 2004-03-03 Nortel Networks Limited Procédé d'émission de signaux radio en diversité de polarisation
EP2870714B1 (fr) * 2012-07-06 2020-03-11 T-Mobile USA, Inc. Commande de polarisation destinée à un système de télécommunication de cellule

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7660598B2 (en) 2004-12-21 2010-02-09 Qualcomm, Incorporated Transmit power reduction for a wireless device with multiple transmit signal paths
DE102005061219A1 (de) * 2005-12-20 2007-06-21 Fachhochschule Aachen Anordnung einer Funkübertagungsstrecke

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5812935A (en) * 1993-04-17 1998-09-22 Hughes Electronics Cellular system employing base station transmit diversity according to transmission quality level
US6104933A (en) * 1997-06-23 2000-08-15 Telefonaktiebolaget Lm Ericsson Method and apparatus for control of base stations in macro diversity radio systems
WO2001054230A1 (fr) * 2000-01-21 2001-07-26 Motorola Inc. Systeme et procede de communication hertzienne faisant intervenir la diversite de polarisation

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4513412A (en) * 1983-04-25 1985-04-23 At&T Bell Laboratories Time division adaptive retransmission technique for portable radio telephones
JPH0744492B2 (ja) * 1988-06-15 1995-05-15 松下電工株式会社 偏波ダイバーシチ無線通信方式
FR2692741B1 (fr) * 1992-06-17 1994-09-02 Autoroutes Cie Financ Indle Perfectionnement aux réseaux isofréquence.
CA2118355C (fr) * 1993-11-30 2002-12-10 Michael James Gans Utilisation de polirisation orthogonales et de decalages de signaux variant avec le temps pour l'emission ou la reception de signaux
US6006069A (en) * 1994-11-28 1999-12-21 Bosch Telecom Gmbh Point-to-multipoint communications system
FR2746991B1 (fr) * 1996-03-28 1998-06-12 Nortel Matra Cellular Station radio a antennes a polarisation circulaire
FR2789807B1 (fr) * 1999-02-17 2004-09-24 Nortel Matra Cellular Station radio a antenne a polarisation circulaire

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5812935A (en) * 1993-04-17 1998-09-22 Hughes Electronics Cellular system employing base station transmit diversity according to transmission quality level
US6104933A (en) * 1997-06-23 2000-08-15 Telefonaktiebolaget Lm Ericsson Method and apparatus for control of base stations in macro diversity radio systems
WO2001054230A1 (fr) * 2000-01-21 2001-07-26 Motorola Inc. Systeme et procede de communication hertzienne faisant intervenir la diversite de polarisation

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1394962A1 (fr) * 2002-08-27 2004-03-03 Nortel Networks Limited Procédé d'émission de signaux radio en diversité de polarisation
FR2844119A1 (fr) * 2002-08-27 2004-03-05 Nortel Networks Ltd Procede d'emission de signaux radio en diversite de polarisation, station et terminal de radiocommunication pour la mise en oeuvre du procede
US7369814B2 (en) 2002-08-27 2008-05-06 Nortel Networks Limited Method of transmitting radio signals with polarization diversity and radiocommunication station and terminal for implementing the method
EP2299605A3 (fr) * 2002-08-27 2011-12-07 Nortel Networks Limited Procédé d'émission de signaux radio en diversité de polarisation et station de radiocommunication associée
EP2456085A3 (fr) * 2002-08-27 2013-07-24 Research In Motion Limited Terminal pour l'émission de signaux radio en diversité de polarisation
EP2870714B1 (fr) * 2012-07-06 2020-03-11 T-Mobile USA, Inc. Commande de polarisation destinée à un système de télécommunication de cellule

Also Published As

Publication number Publication date
GB2376843A (en) 2002-12-24
GB2376843B (en) 2005-01-12
GB0114820D0 (en) 2001-08-08

Similar Documents

Publication Publication Date Title
JP2520115B2 (ja) バ−ストモ−ド両方向無線通信方式
US7003310B1 (en) Coupled uplink/downlink power control and spatial processing with adaptive antenna arrays
US6104918A (en) Method for controlling transmitting power and radio system
JP3636373B2 (ja) 無線電話機用電力制御装置及び方法
EP2041585B1 (fr) Systèmes et procédés de perfectionnements aux signaux d'ondes millimétriques
WO2002029989A1 (fr) Berceau de dispositif sans fil equipe d'un systeme d'antenne pour mode a diversite spatiale
WO1994018756A1 (fr) Procede et appareil de commande du niveau de puissance de l'unite d'un abonne dans un systeme de communication sans fil
CA2345734A1 (fr) Dispositif de radiocommunication et procede de radiocommunication
CN101682385A (zh) 利用单个功率放大器的分集传输
CA2210578A1 (fr) Site de cellules a transmission de commande de gain de diversite pour empecher les signeaux des feux de signalisation de se propager au dela de la portee des signeaux de commande
EP2870714B1 (fr) Commande de polarisation destinée à un système de télécommunication de cellule
CN103548285B (zh) 功率控制方法及相应的基站
KR20010112361A (ko) 편파 다이버시티를 이용한 무선 통신 시스템 및 방법
WO1998042150A2 (fr) Antennes de liaison descendante intelligentes pour systemes amrt is-54/is136
FI97926C (fi) Menetelmä lähetystehon säätämiseksi ja solukkoradiojärjestelmä
WO2002103928A1 (fr) Systeme de radiotelephonie
EP1298816B1 (fr) Procédé de commande de puissance de transmission et station mobile
US8068877B1 (en) Systems and methods of antenna selection
US7542733B1 (en) Method and apparatus for diversity transmission from a mobile station
GB2472074A (en) Adaptive transmit diversity scheme in which each antenna is assigned a different time delay selected using parameter measurements associated with a receiver
JPH06334577A (ja) 無線中継装置
KR100736755B1 (ko) 무선 통신 시스템과, 이러한 무선 통신 시스템에서 사용하기 위한 제 1 지국 및 제 2 지국과, 이러한 무선 통신 시스템을 작동하는 방법
JPH03198438A (ja) 送信電力制御方式
NO318124B1 (no) Anordning for a minske innvirkning av fading i et digitalt mobilt radiokommunikasjonssystem
US8130856B1 (en) Adjustable transmit diversity

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): AE AG AL AM AT AU AZ BA BB BG BR BY BZ CA CH CN CO CR CU CZ DE DK DM DZ EC EE ES FI GB GD GE GH GM HR HU ID IL IN IS JP KE KG KP KR KZ LC LK LR LS LT LU LV MA MD MG MK MN MW MX MZ NO NZ OM PH PL PT RO RU SD SE SG SI SK SL TJ TM TN TR TT TZ UA UG US UZ VN YU ZA ZM ZW

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): GH GM KE LS MW MZ SD SL SZ TZ UG ZM ZW AM AZ BY KG KZ MD RU TJ TM AT BE CH CY DE DK ES FI FR GB GR IE IT LU MC NL PT SE TR BF BJ CF CG CI CM GA GN GQ GW ML MR NE SN TD TG

121 Ep: the epo has been informed by wipo that ep was designated in this application
REG Reference to national code

Ref country code: DE

Ref legal event code: 8642

122 Ep: pct application non-entry in european phase
NENP Non-entry into the national phase

Ref country code: JP

WWW Wipo information: withdrawn in national office

Country of ref document: JP