WO2000055985A1 - Procede de regulation de la puissance d'emission dans un systeme de radiocommunication - Google Patents

Procede de regulation de la puissance d'emission dans un systeme de radiocommunication Download PDF

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Publication number
WO2000055985A1
WO2000055985A1 PCT/DE2000/000762 DE0000762W WO0055985A1 WO 2000055985 A1 WO2000055985 A1 WO 2000055985A1 DE 0000762 W DE0000762 W DE 0000762W WO 0055985 A1 WO0055985 A1 WO 0055985A1
Authority
WO
WIPO (PCT)
Prior art keywords
mobile radio
base station
radio station
station
transmission power
Prior art date
Application number
PCT/DE2000/000762
Other languages
German (de)
English (en)
Inventor
Markus Dillinger
Gerald Ostermayer
Peter Slanina
Enric Mitjana
Egon Schulz
Bernhard Wegmann
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
Publication of WO2000055985A1 publication Critical patent/WO2000055985A1/fr

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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
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/28—TPC being performed according to specific parameters using user profile, e.g. mobile speed, priority or network state, e.g. standby, idle or non transmission
    • H04W52/283—Power depending on the position of the mobile
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/12—Reselecting a serving backbone network switching or routing node
    • 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
    • H04W52/28—TPC being performed according to specific parameters using user profile, e.g. mobile speed, priority or network state, e.g. standby, idle or non transmission
    • H04W52/282—TPC being performed according to specific parameters using user profile, e.g. mobile speed, priority or network state, e.g. standby, idle or non transmission taking into account the speed of the mobile
    • 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
    • H04W52/06—TPC algorithms
    • H04W52/14—Separate analysis of uplink or downlink
    • H04W52/146—Uplink power control

Definitions

  • the invention relates to a method for transmitting power control in a radio communication system, in particular in a mobile radio system.
  • radio communication systems 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 radio station.
  • the electromagnetic waves are emitted at carrier frequencies that lie in the frequency band provided for the respective system.
  • GSM Global System for Mobile Communication
  • the carrier frequencies are in the range of 900 MHz, 1800 MHz and 1900 MHz.
  • UMTS Universal Mobile Telecommunication System
  • 3rd generation systems frequencies in the frequency band of approximately 2000 MHz are provided.
  • WO 96/31014 AI a method for transmitting power control in a mobile communication system is known, in which the transmitting power of a mobile station is controlled by a base station according to the principle of a closed control loop.
  • speed information of the mobile station is taken into account for the control of the transmission power.
  • the invention is based on the object of specifying a method which enables flexible transmission power control. This object is achieved by the method according to the features of independent claim 1. Further developments of the invention can be found in the subclaims.
  • characteristic values relating to transmission ratios of the radio interface are determined and signaled periodically in a radio communication system for a communication connection between a base station and a mobile radio station.
  • the characteristic values for the upward direction or the characteristic values for the upward direction and for the downward direction are alternatively taken into account for the transmission power control in the mobile radio station.
  • the methods according to the invention are used particularly advantageously in radio communication systems which additionally carry out a TDMA subscriber separation and, if appropriate, the information transmission in accordance with a TDD method.
  • a common feature of these methods is that the time slot structure creates a respective time offset between the upward and the downward direction.
  • an interference situation is averaged as a parameter of the characteristic value over a first time interval.
  • the determination can be carried out in the case of a described TDMA subscriber separation the interference situation is at least the time slots assigned to the communication connection.
  • a path loss which represents a further parameter of the characteristic value, is averaged over a second time interval.
  • the duration of the time intervals can be selected depending on the transmitted service in accordance with further developments, the respective duration being signaled, for example, from the base station to the mobile radio station.
  • the first time interval can correspond to a nesting depth of the transmitted service, wherein different services can each have a different nesting depth.
  • the second time interval is chosen to be shorter than the first time interval.
  • the mobile radio station additionally signals to the base station a transmission power which may have been averaged over the first time interval, as a result of which the path loss in the base station during transmission via the radio interface can be determined in the waiting direction.
  • the base station signals a transmission power to the mobile radio station, possibly averaged over the first time interval.
  • the path loss for the downward direction transmission can be obtained from the mobile radio station by means of one from the base station with one of the mobile radio stations. Station known constant transmission power transmitted general signaling channel can be determined.
  • a respective difference is signaled instead of absolute values of the parameters of the characteristic value, a respective absolute value being signaled when a connection is established and / or periodically.
  • the periodic signaling of the absolute values ensures that a control deviation (offset) of the transmission power which arises, for example, due to temporary transmission disturbances can be corrected.
  • a signal-to-noise ratio to be achieved is selected as a function of the transmitted service, a greater signal-to-noise ratio than for voice transmission for a secure reception being desired, for example, in the case of video transmission with a high transmission capacity.
  • the signal-to-noise ratio to be achieved can also be signaled by the mobile radio station and / or by the base station when a connection is established and / or periodically according to a third time interval and taken into account for the respective transmission power control. Signaling is also conceivable when the service is changed or when a bit error rate is increased.
  • the speed of the mobile radio station is determined by means of a time variation of the characteristic values.
  • different parameters for the transmission power control in the mobile radio station are taken into account according to the invention.
  • a suitable dimensioning of the threshold values can be used to define a flexible and possibly adjustable switching hysteresis or a specific switching point for the change between the parameters.
  • reception is carried out in the base station and / or in the mobile radio station in accordance with a known joint detection method.
  • This method advantageously enables a precise estimation of the interference situation in the radio cell of the base station or in the respective time slots of the communication link.
  • diversity reception is carried out in the base station and / or in the mobile radio station. It must be taken into account for the transmission power control and, if necessary, compensated for by signaling correction factors that a lower signal-to-noise ratio is required, and that in the case of diversity reception, for example, carried out only in the base station, the path loss in the downward direction and not the path loss in the upward direction corresponds.
  • FIG. 1 shows a block diagram of a radio communication system, in particular a mobile radio system
  • FIG. 2 shows a schematic representation of the frame structure of the
  • FIG. 3 shows a flow chart of the method according to the invention
  • 4 shows a further flow chart of the invention
  • the structure of the radio communication system shown in FIG. 1 and exemplarily configured as a mobile radio system corresponds to the known GSM mobile radio system, which consists of a large number of mobile switching centers MSC which are networked with one another or which provide access to a fixed network PSTN. Furthermore, these mobile switching centers MSC are each connected to at least one device for assigning radio resources RM. Each of these devices RNM in turn enables a connection to at least one base station BS.
  • This base station BS is a radio station which can establish and trigger communication connections to further radio stations, which can be configured as mobile radio stations MS or stationary subscriber terminals, via a radio interface.
  • the functionality of this structure is used by the method according to the invention.
  • FIG. 1 shows, by way of example, a radio connection for the transmission of, for example, user data and signaling information between the base station BS and a mobile radio station MS, which is located in the radio coverage area of the base station BS and moves at a speed V.
  • FIG. 2 An exemplary frame structure of the radio interface can be seen in FIG. 2.
  • Each time slot ts within the frequency band B forms a frequency channel fk.
  • the successive time slots ts structured according to a frame structure. In this way, 16 time slots ts0 to tsl5 are combined into a time frame tf, which has a duration of 20 ms, for example.
  • part of the time slots tsO to tsl5 in the upward direction and part of the time slots tsO to tsl5 in the downward direction are used, the transmission in the upward direction taking place, for example, before the transmission in the downward direction.
  • There is a switchover point SP which can be flexibly positioned according to the respective need for transmission channels for the up and down direction.
  • a frequency channel fk for the upward direction corresponds to the frequency channel fk for the downward direction.
  • the other frequency channels fk are structured in the same way.
  • Radio blocks consist of sections with data d, in each of which sections with training sequences tseql to tseqn known on the reception side are embedded.
  • the data d are spread individually for each connection with a fine structure, a spreading code c (CDMA code), so that, for example, n connections can be separated at the receiving end by this CDMA component.
  • CDMA code spreading code code
  • the combination of a frequency channel fk and a spreading code c defines a physical transmission channel that can be used for the transmission of signaling and useful information. For the transmission of user information, this physical transmission channel is also referred to as a traffic channel.
  • the spreading of individual symbols of the data d with Q chips has the effect that Q subsections of the duration tchip are transmitted within the symbol duration tsym.
  • the Q chips form the individual CDMA code c.
  • a protection time gp is provided to compensate for different signal propagation times of the connections of successive time slots ts.
  • FIG. 3 and 4 each show an exemplary flow chart of the method according to the invention.
  • the individual method steps in the mobile radio station MS are indicated on the left-hand side and the method steps in the base station BS on the respective right-hand side.
  • the method steps are specified in a time sequence, but the individual steps can also be carried out, for example, in parallel or according to another time sequence.
  • signaling via the radio interface between the mobile radio station MS and the base station BS is indicated, the chronological sequence of which can in turn be changed or which can be combined into a smaller number of signaling due to a signaling economy.
  • FIG. 3 shows a flow chart in which a transmission power Tms of the mobile radio station MS is regulated for a communication link with, for example, a voice transmission service.
  • Both the mobile radio station MS and the base station BS each transmit data in the upward direction UL or in the downward direction, for example of a voice service, via the radio interface.
  • a characteristic value is periodically determined in the base station BS or in the mobile radio station MS, which provides information about the transmission conditions of the radio interface.
  • Interference I for example in one of the multiple time slots ts assigned to the communication connection, a signal-to-noise ratio C / I and a path loss PL are determined as parameters for the characteristic value.
  • a transmission power Tms is determined in the mobile radio station MS, which on the one hand realizes sufficient reception at the location of the base station BS, and on the other hand the lowest possible transmission power Tms for energy saving and for reducing interference in the radio cell of the base station BS.
  • the transmission power can be regulated in the base station BS in the same way.
  • the determined transmission powers Tms, Tbs are then signaled to the other radio station BS or MS.
  • FIG. 4 shows an exemplary method according to the invention based on the flowchart in FIG.
  • the base station BS transmits a general signaling channel BCCH (Broadcast Control Channel) with a maximum transmission power at periodic intervals.
  • BCCH Broadcast Control Channel
  • This maximum transmission power is known a priori in the mobile radio station MS, so that it can determine a path loss PL [DL] for the downlink direction DL for the existing communication connection without explicit signaling of the current transmission power Tbs of the base station BS.
  • the parameters are averaged in the mobile radio station MS over a respective time interval t or tp, the interference I [DL] over a first time interval tm and the path loss PL [DL] over one second time interval tp can be averaged.
  • the averaging advantageously relativizes short-term transmission interference and thus leads to a more homogeneous and constant transmission power control.
  • the duration of the first time interval tm corresponds to the nesting depth of the transmitted service. In the case of a voice service, the nesting depth is, for example, two time frames tf corresponding to 20 ms.
  • the duration of the second time interval tp is chosen to be shorter than the first time interval tm in order to enable fast transmission power control described below.
  • the respective duration of the time intervals tm, tp can differ for different services, for example a respective signaling of the time intervals tm, tp to be taken into account is signaled by the base station BS.
  • the parameters I [UL], PL [UL] are averaged over the time intervals tm, tp in the base station BS.
  • the mobile radio station MS and the base station BS each generate a signal-to-noise ratio C / I [tgtUL], C / I [tgtDL] signals, the signaling for example when establishing a connection and periodic - the periodicity can be large compared to the first time interval tm.
  • the current speed V is determined in the mobile radio station MS. This determination can be carried out in the same way in the base station BS and the determined speed V can be signaled to the mobile radio station MS.
  • the speed V is determined, for example, by means of a temporal variation of one or more parameters of the characteristic values, a rapid variation indicating, for example, a high speed V and a slow variation indicating a low speed V of the mobile radio station MS.
  • the determined speed V is compared with an upper threshold value and, if exceeded, the parameters to be taken into account for the transmission power control are changed. In the same way, a comparison of the determined speed V with a lower threshold value is then carried out, and the parameters are changed again when the threshold value is undershot.
  • the threshold values are dimensioned in such a way that optimum transmission power control is made possible in each case.
  • a switching hysteresis or a specific switch point can be defined.
  • the threshold values can be adapted individually to different services, the threshold values to be used in each case being known, for example, in the mobile radio station MS or signaled by the base station BS.
  • the mean path loss PL [DL] determined in the mobile radio station MS is taken into account for the downward direction DL. This value is available to the mobile radio station MS at any time or after a respective expiry of the second time interval tf m.
  • the currently determined path loss PL [DL] can also be used. This advantageously means that there is no need to wait for signaling of the path loss PL [UL] determined and signaled by the base station BS for the waiting direction UL, which signaling is signaled periodically, for example, periodically in the first time interval tm by the base station BS. A faster reaction to variations in the transmission properties is thus possible.
  • the one determined by the base station BS is used and signaled mean path loss PL [UL] for the upward direction UL for the transmission power control.
  • fast transmission power regulation is dispensed with in order to ensure a constantly high transmission quality on the communication link.
  • the average transmission power Tms of the mobile radio station MS is calculated accordingly:
  • the required transmission power Tbs of the base station BS is calculated in the same way, again taking into account parameters determined and signaled by the mobile radio station MS for the transmission power control.
  • the average transmission power Tbs of the base station BS results from:
  • / Tbs (i) C / I [tgtDL] * / I [DL] * / PL [DL] (i).
  • bit error rate BER bit error rate
  • the respective radio station MS, BS signals a higher signal-to-noise ratio C / I [tgtDL] or C / I [tgtUL] to be achieved, which has a direct influence on the regulation of the transmission power Tms, Tbs in accordance with the equations described.

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

Abstract

Selon l'invention, dans un système de radiocommunication, pour une liaison de communication entre une station de base et une station radio mobile, une valeur caractéristique relative aux conditions de transmission de l'interface radio est, de façon périodique, respectivement déterminée et signalée. En fonction d'une vitesse de la station radio mobile et/ou du service transmis dans la liaison de communication, la valeur caractéristique pour la direction vers le haut et la valeur caractéristique pour la direction vers le haut et pour la direction vers le bas est prise en compte pour la régulation de la puissance d'émission dans la station radio mobile.
PCT/DE2000/000762 1999-03-12 2000-03-10 Procede de regulation de la puissance d'emission dans un systeme de radiocommunication WO2000055985A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19911146A DE19911146C2 (de) 1999-03-12 1999-03-12 Verfahren zur Sendeleistungsregelung in einem Funk-Kommunikationssystem
DE19911146.4 1999-03-12

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WO2000055985A1 true WO2000055985A1 (fr) 2000-09-21

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001028124A1 (fr) * 1999-10-11 2001-04-19 Telefonaktiebolaget Lm Ericsson Emetteur-recepteur radio a vitesse reglee en fonction de l'estimation qualitative d'un signal
CN100355215C (zh) * 2001-01-05 2007-12-12 高通股份有限公司 通信系统内的前向功率控制的方法和装置

Citations (5)

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Publication number Priority date Publication date Assignee Title
US4777653A (en) * 1985-12-20 1988-10-11 Telecommunications Radioelectriques Et Telephoniques T.R.T. Apparatus for controlling transmission power over a digital radio communication channel
US5559790A (en) * 1993-07-23 1996-09-24 Hitachi, Ltd. Spread spectrum communication system and transmission power control method therefor
WO1996031014A1 (fr) * 1995-03-31 1996-10-03 Qualcomm Incorporated Procede et dispositif pour reguler la puissance dans un systeme de communication mobile
US5881367A (en) * 1995-07-25 1999-03-09 Alcatel Espace Method of regulating the power of a signal transmitted by a first station to a second station in a satellite telecommunication network
US5963870A (en) * 1997-03-26 1999-10-05 Nortel Networks Corporation Process for switching between IS-95 forward power control and fast forward power control

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3039402B2 (ja) * 1996-12-05 2000-05-08 日本電気株式会社 移動通信システムの送信電力制御装置

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4777653A (en) * 1985-12-20 1988-10-11 Telecommunications Radioelectriques Et Telephoniques T.R.T. Apparatus for controlling transmission power over a digital radio communication channel
US5559790A (en) * 1993-07-23 1996-09-24 Hitachi, Ltd. Spread spectrum communication system and transmission power control method therefor
WO1996031014A1 (fr) * 1995-03-31 1996-10-03 Qualcomm Incorporated Procede et dispositif pour reguler la puissance dans un systeme de communication mobile
US5881367A (en) * 1995-07-25 1999-03-09 Alcatel Espace Method of regulating the power of a signal transmitted by a first station to a second station in a satellite telecommunication network
US5963870A (en) * 1997-03-26 1999-10-05 Nortel Networks Corporation Process for switching between IS-95 forward power control and fast forward power control

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001028124A1 (fr) * 1999-10-11 2001-04-19 Telefonaktiebolaget Lm Ericsson Emetteur-recepteur radio a vitesse reglee en fonction de l'estimation qualitative d'un signal
GB2355366B (en) * 1999-10-11 2003-08-20 Ericsson Telefon Ab L M Radio transceiver
US6907259B1 (en) 1999-10-11 2005-06-14 Telefonaktiebolaget L M Ericsson (Publ) Radio transceiver
CN100355215C (zh) * 2001-01-05 2007-12-12 高通股份有限公司 通信系统内的前向功率控制的方法和装置
US7515580B2 (en) 2001-01-05 2009-04-07 Qualcomm, Incorporated Method and apparatus for forward power control in a communication system

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Publication number Publication date
DE19911146C2 (de) 2003-10-02
DE19911146A1 (de) 2000-10-05

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