US20030128559A1 - Method for regulating the transmitting power of a master station, and corresponding master station - Google Patents

Method for regulating the transmitting power of a master station, and corresponding master station Download PDF

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Publication number
US20030128559A1
US20030128559A1 US10/276,834 US27683402A US2003128559A1 US 20030128559 A1 US20030128559 A1 US 20030128559A1 US 27683402 A US27683402 A US 27683402A US 2003128559 A1 US2003128559 A1 US 2003128559A1
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Prior art keywords
transmission power
power
pmean
station
deltap
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Abandoned
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US10/276,834
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English (en)
Inventor
Frank Kowalewski
Siegfried Baer
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Ipcom GmbH and Co KG
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Individual
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Application filed by Individual filed Critical Individual
Assigned to ROBERT BOSCH GMBH reassignment ROBERT BOSCH GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BAER, SIEGDRIED, KOWALEWSKI, FRANK
Publication of US20030128559A1 publication Critical patent/US20030128559A1/en
Assigned to IPCOM GMBH & CO. KG reassignment IPCOM GMBH & CO. KG ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ROBERT BOSCH GMBH
Assigned to KAROLS DEVELOPMENT CO. LLC reassignment KAROLS DEVELOPMENT CO. LLC SECURITY AGREEMENT Assignors: IPCOM GMBH & CO. KG
Priority to US12/410,870 priority Critical patent/US9008596B2/en
Assigned to LANDESBANK BADEN-WUERTTEMBERG reassignment LANDESBANK BADEN-WUERTTEMBERG SECURITY AGREEMENT Assignors: IPCOM GMBH & CO. KG
Assigned to IPCOM GMBH & CO. KG reassignment IPCOM GMBH & CO. KG CONFIRMATION OF RELEASE OF SECURITY INTEREST Assignors: KAROLS DEVELOPMENT CO. LLC
Abandoned legal-status Critical Current

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    • 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
    • H04W52/30—TPC using constraints in the total amount of available transmission power
    • H04W52/36—TPC using constraints in the total amount of available transmission power with a discrete range or set of values, e.g. step size, ramping or offsets
    • H04W52/362—Aspects of the step size
    • 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
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/22—TPC being performed according to specific parameters taking into account previous information or commands
    • H04W52/225—Calculation of statistics, e.g. average, variance

Definitions

  • the method according to the invention for regulating the transmission power of a transmitting station, and the transmitting station according to the invention, as defined by the characteristics of the respective independent claims, have the advantage over the prior art that the amount of the change in the transmission power is adjusted as a function of a power ratio between the current transmission power and an average over time in the transmission power, such that when the value of the power ratio is increasing, the amount of the change in the transmission power is also raised.
  • the transmission power can be adapted faster and more precisely to the properties of the transmission channels of the transmission system.
  • the deviation in the signal/interference ratio, measured in the receiving station, from a specified target value can thus be kept as slight as possible. At relatively high speeds between the transmitting station and the receiving station, it is thus possible above to compensate for rapid, deep attenuation incursions on a transmission channel between the two stations. Errors in transmission are thus reduced.
  • Another advantage is that to perform the method of the invention, changes are needed in a conventional transmitting station on to the extent that an evaluation unit is provided, which by the method of the invention changes the transmission power of the transmitting station as a function of the instruction received from the receiving station. No modification of the receiving station is needed for performing the method of the invention.
  • the relationship between the power ratio and the amount of the change in the transmission power is selected to be nonlinear. In this way, rapid, deep attenuation incursions in the transmission of signals from the transmitting station to the receiving station can be compensated for even faster, because the transmission power of the transmitting station can be readjusted even faster. The deviation of the estimated signal/interference ratio from the specified target value can thus be kept even smaller.
  • FIG. 1 is a block circuit diagram of power control between a transmitting station and a receiving station
  • FIG. 2 is a flowchart for the mode of operation of the method of the invention
  • FIG. 3 shows a course over time of the reception field intensity of the receiving station and the optimal transmission power of the transmitting station
  • FIG. 4 shows a nonlinear characteristic curve for the change in the amount of the transmission power, referred to a power ratio.
  • the system capacity which can be expressed as the number of subscribers who are all active at the same time with a specified connection quality, is dependent on regulating the transmission power.
  • the object of regulating the transmission power is, for every mobile radio connection, that is, both for a downlink transmission direction from a base station to a mobile station and for an uplink transmission direction from the mobile station to the base station, to adjust the transmission power individually in such a way that a specified target value SIR z in the signal/interference ratio SIR (signal to interference ratio) can be adhered to.
  • the UMTS will now be addressed as an example.
  • two different duplex transmission methods across the air interface are provided, as disclosed in the publication entitled “TS 25.201 V3.0.0: Physical Layer—General Description”, 3GPPP TSG-RAN-WG1, 1999. These two methods are FDD (frequency division duplex) and TDD (time division duplex). In both, at least for the downlink transmission direction, a closed control loop is provided for regulating the transmission power.
  • FIG. 1 shows as an example the block circuit diagram of a closed control loop for regulating the transmission power P in a mobile radio system, such as UMTS.
  • the control loop is identified in FIG. 1 by reference numeral 1 . It includes a transmitting station 10 and a receiving station 20 .
  • the transmitting station 10 is embodied as the base station
  • the receiving station 20 is embodied as the mobile station of the UMTS.
  • a downlink transmission channel from the base station 10 to the mobile station 20 is identified in FIG. 1 by reference numeral 31
  • an uplink transmission channel from the mobile station 20 to the base station 10 is identified in FIG. 1 by reference numeral 32 .
  • the base station 10 includes a first transmitting unit 14 and a first receiving unit 11 .
  • the first receiving unit 11 communicates with the first transmitting unit 14 via a first evaluation unit 12 and a second evaluation unit 13 .
  • Other modules of the base station 10 which are unnecessary to comprehension of the invention, are not shown in FIG. 1 for the sake of simplicity.
  • the mobile station 20 includes a second receiving unit 21 and a second transmitting unit 24 .
  • An SIR estimator 22 is connected to the second receiving unit 21 and communicates with the second transmitting unit 24 via a third evaluation unit 23 .
  • Other modules of the mobile station 20 which are unnecessary to comprehension of the invention, are not shown in FIG. 1 for the sake of simplicity.
  • the invention will now be describe taking the TDD method as an example.
  • the base station 10 via the first transmitting unit 14 , sends a signal, at the transmission power P which is constant over a time slot, to the mobile station 20 via the downlink transmission channel 31 .
  • This mobile station receives the signal by means of the second receiving unit 21 .
  • the SIR estimator 22 ascertains the signal/interference ratio SIR of the transmission.
  • the third evaluation unit 23 performs a comparison of the estimated signal/interference ratio SIR with a specified target value SIR z for this ratio and as a function of this comparison generates TPC (transmit power control) instructions for changing the transmission power P of the base station 10 .
  • TPC transmit power control
  • the signals and the TPC instructions are received by the first receiving unit 11 and sent on to the first evaluation unit 12 .
  • the first evaluation unit 12 extracts the TPC instructions from the signals received.
  • the TPC instructions and the transmission power P currently being used in the first transmitting unit 14 are then sent to the second evaluation unit 13 .
  • the amount of the change DeltaP in the transmission power P of the first transmitting unit 14 is then ascertained, in order to adapt the transmission power P adaptively to the current properties of the downlink transmission channel 31 .
  • the amount of the reception field intensity E in the second receiving unit 21 is plotted in a solid line over the time t for the situation without power control.
  • This course, with deep incursions, is generally called “fast fading” and is typical of mobile radio channels.
  • the dashed line in FIG. 4 shows the transmission power P theoretically required in the first transmitting unit 14 to obtain a constant signal level, at a constant interference power, in the second receiving unit 21 , or in other words to compensate for the effects of fading.
  • the course of the transmission power P over time t is the inverse of the course of the reception field intensity E.
  • FIG. 3 a first time t 1 is shown at which the transmission power P is low, because the amount of the reception field intensity E is correspondingly high.
  • a small change DeltaP in the transmission power P for instance by 1 dB, is needed in order to adapt the signal/interference ratio SIR, which has been measured by the SIR estimator 22 , to the power ratio SIR z .
  • the amount of the change DeltaP in the transmission power P is now to be made greater, if the transmission power P is increasing.
  • An increase in the transmission power P is an indication that an attenuation incursion in the reception field intensity E has occurred and must be compensated for.
  • FIG. 3 shows, after the first time t 1 , the requisite transmission power P rises continuously up to a maximum at a fourth time t 4 .
  • intermediate values in the transmission power P are found at a second time t 2 and a third time t 3 , and t 1 ⁇ t 2 ⁇ t 3 ⁇ t 4 , and the requisite transmission power P to compensate for the reception field intensity E becomes greater nonlinearly, with an initially increasing rise.
  • This means that the amount of the change DeltaP must also rise from the first time t 1 to the fourth time t 4 , if the course of the transmission power P shown in FIG. 3 is to be attained and thus if the signal/interference ratio SIR ascertained in the SIR estimator 22 is to be adapted as fast as possible to the signal/interference ratio SIR z .
  • the changes DeltaP in the transmission power P must accordingly be selected as still greater, the higher the current transmission power P set at the first transmitting unit 14 is. This can be done for instance by means of a nonlinear characteristic-curve as shown in FIG. 4, in which the amount of the change DeltaP in dB is plotted over the transmission power P of the first transmitting unit 14 , for example, and the transmission power P is also referred to an average over time Pmean in the transmission power P.
  • the referral of the transmission power P to the average over time Pmean is necessary, because the absolute value of the transmission power P also depends on the distance of the mobile station 20 from the base station 10 and thus is not by itself conclusive as to incursions in the course of the reception field intensity E.
  • the average over time Pmean in the transmission power P is formed from the values for the transmission powers P of preceding time slots in the downlink transmission channel 31 in the first transmitting unit 14 .
  • FIG. 4 the course of the amount of the change DeltaP in the transmission power P is plotted over the power ratio P/Pmean, formed from the quotient of the transmission power P and the average over time Pmean, in the form of a parabola branch whose apex is at the value pair (1/1).
  • P/Pmean a value of 1 db is chosen in FIG. 4 for the amount of the change DeltaP in the transmission power P.
  • still other nonlinear relationships between the amount of the change DeltaP in the transmission power P and the power ratio P/Pmean are conceivable.
  • a nonlinear relationship between the amount of the change DeltaP and the power ratio P/Pmean makes especially fast tracking of the signal/interference ratio SIR, estimated in the SIR estimator 22 , to the specified target value SIR z possible. Nevertheless, a linear relationship between the amount of the change DeltaP and the power ratio P/Pmean, at which then the adaptation of the specified target value SIR z in the case of abrupt fading incursions cannot be tracked as fast as it can with a nonlinear relationship, can also be selected.
  • a starting value for the transmission power P and an initial value for an increment size for the change DeltaP in the transmission power P are first ascertained, at a program point 40 .
  • This increment size can for instance amount to 1 dB, as shown in FIG. 4.
  • the starting value for the transmission power P and the initial value for the increment size of the change DeltaP in the transmission power P can be selected by the first transmitting unit 14 , for example.
  • a jump is then made to program point 41 .
  • the first receiving unit 11 checks whether the connection between the base station 10 and the mobile station 20 still exists.
  • the first receiving unit 11 asks whether a disconnection request has been received via the uplink transmission channel 32 . If at program point 41 the first receiving unit 11 ascertains that the connection still exists (YES decision), then a jump is made to a program point 42 ; if not (NO decision), a departure from the program is made.
  • the mean over time Pmean is formed from the values for the transmission power P from preceding time slots of the downlink transmission channel 31 . This averaging is done in the second evaluation unit 13 . To that end, the second evaluation unit 13 is also supplied with the current transmission power P from the first transmitting unit 14 of FIG. 1 and FIG. 2. At program point 41 , the current transmission power P and the average over time Pmean, ascertained in program point 42 , for the power ratio P/Pmean are also formed in the second evaluation unit 13 .
  • the second evaluation unit 13 checks whether a TPC instruction was received via the uplink transmission channel 32 . If so, a jump is made to a program point 44 ; if not, a jump is made back to program point 41 .
  • the second evaluation unit 13 knows, from the TPC instruction received, that the transmission power P of the first transmitting unit 14 has to be changed, and the received TPC instruction from the second evaluation unit 13 furthermore tells which sign this change has to have.
  • the second evaluation unit 13 at program point 44 thus causes the first transmitting unit 14 to change the transmission power P by the amount of the change DeltaP, ascertained at program point 42 , in the transmission power P, and the sign for the change is specified by the TPC instruction received. A jump back to program point 41 is then made.
  • the method of power regulation described be used in both the uplink and the downlink directions of transmission, and in this case not only the base station 10 but also the mobile station 20 would have to have the first evaluation unit 12 , the second evaluation unit 13 , the third evaluation unit 23 , and the SIR estimator 22 , so that they will be able not only to perform a SIR estimation of the signals received and to generate a corresponding TPC instruction, but also to achieve weighting of TPC instruction received and an adaptation of the transmission power P.
  • the method of the invention can also be used in an FDD system.
  • the use of the method of the invention in a UMTS is selected only as an example.
  • the method of the invention can also be used for instance in a GMS (Global System for Mobile Communications) mobile radio network.
  • GMS Global System for Mobile Communications

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
US10/276,834 2000-05-20 2001-03-17 Method for regulating the transmitting power of a master station, and corresponding master station Abandoned US20030128559A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US12/410,870 US9008596B2 (en) 2000-05-20 2009-03-25 Method for regulating the transmission power of a transmitting station, and transmitting station

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10025041.6 2000-05-20
DE10025041.6A DE10025041B4 (de) 2000-05-20 2000-05-20 Verfahren zur Regelung der Sendeleistung einer Sendestation und Sendestation

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US12/410,870 Continuation US9008596B2 (en) 2000-05-20 2009-03-25 Method for regulating the transmission power of a transmitting station, and transmitting station

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US10/276,834 Abandoned US20030128559A1 (en) 2000-05-20 2001-03-17 Method for regulating the transmitting power of a master station, and corresponding master station
US12/410,870 Expired - Fee Related US9008596B2 (en) 2000-05-20 2009-03-25 Method for regulating the transmission power of a transmitting station, and transmitting station

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US (2) US20030128559A1 (de)
EP (1) EP1290813B1 (de)
JP (1) JP4587263B2 (de)
DE (2) DE10025041B4 (de)
WO (1) WO2001091320A1 (de)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7634290B2 (en) * 2005-05-31 2009-12-15 Vixs Systems, Inc. Adjusting transmit power of a wireless communication device
JP5109856B2 (ja) * 2008-07-30 2012-12-26 富士通株式会社 無線移動局装置および無線基地局装置
US11653221B2 (en) * 2020-02-28 2023-05-16 Bae Systems Information And Electronic Systems Integration Inc. Method for control of cognitive LPE radio
CN112512110B (zh) * 2020-11-19 2022-03-15 合肥工业大学 智能变电站可靠性需求约束的无线发射功率预测控制方法

Citations (3)

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Publication number Priority date Publication date Assignee Title
US5933782A (en) * 1996-07-29 1999-08-03 Ntt Mobile Communications Network Inc. Downlink transmission power control scheme for mobile communication system using site diversity
US6166598A (en) * 1999-07-22 2000-12-26 Motorola, Inc. Power amplifying circuit with supply adjust to control adjacent and alternate channel power
US6341224B1 (en) * 1996-06-27 2002-01-22 Ntt Mobile Communications Network, Inc. Power controller for mobile communication system wherein a signal to interference threshold is dynamically moved based on an error rate measurement

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US5535238A (en) 1990-11-16 1996-07-09 Interdigital Technology Corporation Spread spectrum adaptive power control communications system and method
JPH07226709A (ja) * 1994-02-14 1995-08-22 Matsushita Electric Ind Co Ltd 無線通信システム
JP2980156B2 (ja) * 1994-05-12 1999-11-22 エヌ・ティ・ティ移動通信網株式会社 送信電力制御方法および該制御方法を用いたスペクトル拡散通信装置
TW347616B (en) * 1995-03-31 1998-12-11 Qualcomm Inc Method and apparatus for performing fast power control in a mobile communication system a method and apparatus for controlling transmission power in a mobile communication system is disclosed.
FI100072B (fi) * 1996-01-19 1997-09-15 Nokia Mobile Phones Ltd Menetelmä lähetystehon säätämiseksi sekä radiojärjestelmä
JP3254390B2 (ja) * 1996-10-18 2002-02-04 三菱電機株式会社 送信電力制御装置
JP2856198B2 (ja) * 1997-06-11 1999-02-10 日本電気株式会社 スペクトラム拡散受信機
JP3755704B2 (ja) * 1997-12-27 2006-03-15 ソニー株式会社 送信電力制御方法、基地局装置及び通信端末装置
DE19821519C2 (de) * 1998-05-13 2001-08-09 Siemens Ag Verfahren zum insbesondere Indoor-Betreiben einer drahtlosen Telekommunikationseinrichtung
DE19958383A1 (de) 1999-12-03 2001-06-07 Bosch Gmbh Robert Verfahren zur Regelung der Sendeleistung einer Sendestation und Empfangsstation zur Durchführung des Verfahrens

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6341224B1 (en) * 1996-06-27 2002-01-22 Ntt Mobile Communications Network, Inc. Power controller for mobile communication system wherein a signal to interference threshold is dynamically moved based on an error rate measurement
US5933782A (en) * 1996-07-29 1999-08-03 Ntt Mobile Communications Network Inc. Downlink transmission power control scheme for mobile communication system using site diversity
US6166598A (en) * 1999-07-22 2000-12-26 Motorola, Inc. Power amplifying circuit with supply adjust to control adjacent and alternate channel power

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Publication number Publication date
WO2001091320A1 (de) 2001-11-29
JP2003534706A (ja) 2003-11-18
DE50102144D1 (de) 2004-06-03
DE10025041B4 (de) 2018-08-02
JP4587263B2 (ja) 2010-11-24
US20090197548A1 (en) 2009-08-06
US9008596B2 (en) 2015-04-14
EP1290813A1 (de) 2003-03-12
DE10025041A1 (de) 2001-11-22
EP1290813B1 (de) 2004-04-28

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