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WO2001011813A1 - Procede d'adaptation aux caracteristiques d'un canal de transmission dans des systemes de telephonie mobile - Google Patents

Procede d'adaptation aux caracteristiques d'un canal de transmission dans des systemes de telephonie mobile Download PDF

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Publication number
WO2001011813A1
WO2001011813A1 PCT/DE2000/001421 DE0001421W WO0111813A1 WO 2001011813 A1 WO2001011813 A1 WO 2001011813A1 DE 0001421 W DE0001421 W DE 0001421W WO 0111813 A1 WO0111813 A1 WO 0111813A1
Authority
WO
WIPO (PCT)
Prior art keywords
transmission channel
mobile station
radio system
channel properties
mobile radio
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.)
Ceased
Application number
PCT/DE2000/001421
Other languages
German (de)
English (en)
Inventor
Ralf Wiedmann
Bernhard Raaf
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.)
Siemens AG
Siemens Corp
Original Assignee
Siemens AG
Siemens Corp
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 AG, Siemens Corp filed Critical Siemens AG
Publication of WO2001011813A1 publication Critical patent/WO2001011813A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0027—Scheduling of signalling, e.g. occurrence thereof
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0025—Transmission of mode-switching indication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation

Definitions

  • the present invention relates to a method for operating a mobile radio system and a corresponding mobile radio system, in particular a UMTS mobile radio system (Universal Mobile Telecommunication System).
  • a UMTS mobile radio system Universal Mobile Telecommunication System
  • the present invention is therefore based on the object of proposing a method for operating a mobile radio system and a corresponding mobile radio system, with which the best possible adaptation of the system resources to the actual needs can be achieved.
  • the temporal change in the channel properties of the corresponding transmission channel is applied by the mobile station and / or the base station of the mobile radio system. ))> t ⁇ ) P> c ⁇ o L ⁇ ono Cn
  • the speed of travel of the mobile station can be used as a measure of the change in the transmission channel properties over time.
  • the invention is particularly advantageous wherever the transmission conditions do not change or change only very slowly. As a rule, this will always be the case if the mobility of the mobile phone or the corresponding mobile radio subscriber is restricted. Likewise, e.g. it is conceivable that a cell phone subscriber uses his UMTS cell phone at home instead of a landline connection to establish an internet connection, since the cell phone network may provide a significantly higher bandwidth (e.g. in emerging countries). In this case too, the mobile telephone does not move, so that the changes in the transmission channel over time are small.
  • the present invention can be applied in particular to UMTS mobile radio systems, in which case a corresponding adaptation of the UMTS messages provided in accordance with the current standardization may be necessary.
  • the single figure shows a greatly simplified block diagram of a mobile radio system according to the invention, for example a UMTS mobile radio system, which is represented by a mobile station 1 and a base station 8 communicating therewith via a transmission channel 12.
  • a mobile radio system for example a UMTS mobile radio system, which is represented by a mobile station 1 and a base station 8 communicating therewith via a transmission channel 12.
  • tion 1 back, which instructs the mobile station 1 to increase or decrease its transmission power by a certain amount ⁇ P.
  • This power control information transmitted via the transmission channel 12 and contained in the received signal a of the mobile station 1 can now be used to estimate the dynamics of the transmission channel 12, for which purpose the measuring device 2 sums up the power control information transmitted over the transmission channel 12 during a certain period of time and the entirety evaluates these power control commands. If as many commands for increasing the transmission power as commands for reducing the transmission power were transmitted during this specific period of time, it can be deduced from this that the transmission channel 12 does not change or changes only very slowly.
  • a deterioration of the transmission channel 12 can be concluded if more commands for increasing the transmission power have been transmitted during this period, while an improvement in the transmission channel properties can be concluded if more commands for reducing the transmission power have been transmitted during this period.
  • the step size ⁇ P is not constant, the observation period over which the power control commands transmitted via the transmission channel 12 are added up is advantageously continuously adapted to the step size. This procedure for determining the dynamics of the transmission channel 12 is particularly easy to implement, since the measuring device 2 in principle only has to have a counter for counting the power control bits and a decision maker or comparator for evaluating the total power control information.
  • the received signal a can, however, also be evaluated by the measuring device 2 in another way to estimate the dynamics of the transmission channel 12. For example, it is conceivable, depending on fluctuations in the received signal level, for corresponding changes over time in the transmission channel.
  • ⁇ cn er d 3 3 ⁇ : ⁇ ia P- rt cn d ⁇ cn ⁇ od cn HP> cn o tr li d cn ⁇ ⁇ 3 ⁇ ⁇ P- d tr rt H o 3 rt dd cn ⁇ tr o M tr cn rt P- P- cn d HI P- O: d tr * SU N ⁇ tu P- * v ⁇ rt ⁇ d ⁇ C ⁇ ⁇ n tr
  • the mobile station 1 can also determine the speed of travel of the mobile station 1 by observing the mobile station 1 which cells or how many cells have been traversed within a certain time period, so that the speed of travel can be estimated therefrom.
  • This information can then be transmitted to base station 8, for example in the form of an indication of the number of cells passed per unit of time, where this information is then assigned to an actual speed in the area under consideration based on the cell size known there.
  • This procedure can then also be extended to the neighboring cells observed in the past.
  • the mobile station 1 can also only inform the base station 8 of the cells passed so far, so that the base station 8 can use this message to infer the path covered by the mobile station 1.
  • This method can also be extended to the neighboring cells observed in the past.
  • So-called RAKE receivers 5 are often used in mobile radio receivers.
  • RAKE receivers enable profits to be increased by using multipath signals which arrive at the receiving antenna with different delay times.
  • the RAKE receiver 5 processes the received signal coming from the receiving antenna in several paths, the so-called 'fingers' of the RAKE receiver 5, each of these fingers being set to one of the multipath signals with an optimized phase position.
  • a viewfinder 6 is coupled, which permanently searches for the strongest multi-path signals and ensures that the fingers of the RAKE receiver 5 are always optimally adjusted to the most receivable multi-path signals.
  • Each path of the RAKE receiver 5 is separately corresponding equalized in its time delay, for which purpose the channel impulse response of the transmission channel or the corresponding channel parameters are estimated in the receiver on the basis of a known data sequence transmitted via the transmission channel 12, which is referred to as the training sequence or pilot bit sequence.
  • This property of the RAKE receiver 5 can be used by the measuring device 2, since by monitoring the change over time the channel parameters c estimated by the RAKE receiver 5 or certain properties thereof, such as e.g. whose time derivation or zeroing, the dynamics of the transmission channel 12 can be determined, for example, by a threshold value comparison.
  • This procedure has the advantage that it can only be implemented in software and the channel parameters in each receiver have to be calculated anyway. In addition, changes in the interference on the transmission channel 12 do not influence the dynamic estimation, so that this procedure enables the dynamics of the transmission channel 12 to be most accurately estimated.
  • the searcher 6 searches for incoming multipath signals at a predetermined time interval and detects the occurrence of a new path. If such a case occurs, the searcher 6 causes a new RAKE finger to be generated. If the signal power is too low, a RAKE finger is given up.
  • the number of RAKE fingers currently generated can be recorded with the aid of a counter 7.
  • the counter reading quantifies particularly clearly the number of 'fading' holes in the transmission channel 12. By monitoring the change over time in the counter reading of the counter 7, the measuring device 2 can estimate the dynamics of the transmission channel 12, since a rapid change in the transmission channel properties means a correspondingly rapid change the number of RAKE fingers.
  • the function of the counter 7 can also be of two counters, namely a counter for counting the generated ones RAKE fingers and a counter for counting the given RAKE fingers. This previously described procedure for estimating the dynamics of the transmission channel 12 can be implemented with little additional effort, since only the counter 7 and a decision-maker evaluating the counter reading must be provided in the measuring device 2.
  • a transmission device 4 of the mobile station 1 advantageously sends a corresponding measurement report ('Measurement Report') to the base station 8, in which the instantaneous dynamics of the transmission channel 12 are communicated.
  • the measurement information of the measuring device 2 can thus be transmitted in the form of a corresponding bit field.
  • the bit field can contain, in particular, a statement about the speed of the change in the transmission channel properties over time or just a statement about the speed of travel of the mobile station 1. If the bit field comprises two bits, for example, these can be coded as follows:
  • a 'Measurement Report' includes the following measurement information elements: 'Measurement Object', 'Measurement Quantity', 'Reporting Quantity' and 'Reporting Criteria'. These measurement information elements would have to be modified or supplemented accordingly.
  • the information element 'Measurement Object' denotes the object of the measurement carried out, while 'Measurement Quantity' defines the scope of measurement.
  • 'Reporting Quantity' shows the scope of the report on the measurement performed, while 'Reporting Criteria' defines the criteria for the transmission of the measurement report (for example periodically or event-dependent).
  • corresponding adaptations are required for the 'Measurement Control' standard message provided according to the UMTS standard, which is transmitted from the base station 8 to the mobile station 1 and controls the measurement to be carried out by the mobile station 1.
  • the standard message "System Information" would have to be adapted, which is also transmitted from the base station 8 to the mobile station 1 and all contains common information about the mobile radio system with some of the measurement information elements described above.
  • the dynamics of the transmission channel 12 could be defined as an additional measurement information element or could also be inserted as a new 'reporting quantity' for intra-frequency measurements. It is also conceivable to transmit information about the dynamics of the transmission channel 12 with each UMTS standard message 'URA Update'.
  • This' URA update 'message is transmitted from the mobile station 1 to the base station 8 in order to inform the latter or the mobile radio network (' Universal Terrestrial Radio Access Network ', UTRA) that the mobile station 1 has entered a new registration area (' UTRA Registration Area ', URA).
  • the transmission of this 'URA update' message can be triggered, for example, depending on events (e.g. each time a cell is changed) or periodically, depending on the time.
  • the dynamics of the transmission channel or e.g. the locomotion speed measured as a measure for this by the mobile station 1 is also transmitted to the base station 8 with the so-called 'location update request' message.
  • the mobile station 1 in UMTS mobile radio systems requests the base station 8 to carry out a new localization process.
  • a device 9 which evaluates the transmitted measurement reports 11 and a device 10 which, depending on the evaluation by the evaluation device 9, carries out one or more of the measures described by way of example in order to agreed system parameters of the mobile radio system to adapt to the dynamics of the transmission channel 12.
  • a further measuring device 3 is only shown by way of example, which is provided for carrying out some of these measurements and is controlled by the measuring device 2 in such a way that measurements are less frequently carried out by the measuring device 3 when a slight change in the transmission channel properties is detected over time , since it can be assumed that, due to the hardly changing channel conditions, the last measurements carried out by the measuring device 3 are still valid.
  • the measurements carried out by the measuring device 3 can be triggered in a time-dependent or event-dependent manner, so that the event-dependent trigger or the period of the time-dependent trigger for these measurements can be used to implement the procedure described above when a certain threshold value of the dynamics of the transmission channel is reached 12 or to refer to the speed of travel of the mobile station 1.
  • the trigger can also be related to the value of the dynamics or the estimated speed of travel integrated over time.
  • Measurement reports or interim reports are sent from the previously mentioned transmission device 4.
  • the transmitting device 4 can also be controlled by the measuring device 2 in such a way that the frequency of the transmission of these reports is reduced as the temporal change in the transmission channel properties decreases.
  • the measurements required to determine the dynamics of the transmission channel can also be carried out by the mobile station 1 in the so-called 'idle' mode and the resulting information about the dynamics of the transmission channel, for example the speed information, e.g. in the form of a 'Location Update Request' or 'URA Update Request' message to the base station 8.
  • the base station 8 can then determine a suitable routing area for the mobile station 1 in question.
  • the detection of the speed in the 'idle' mode has the advantage that the speed can be averaged over a relatively long period of time, for example over a fraction of the time required to cross a cell or a localization area of the mobile radio system, so that the speed estimation can be performed relatively easily with good accuracy.
  • handover criteria that are used in each handover process, i.e. when the responsibility for a mobile station 1 is passed on from one base station 8 to another base station, for example due to a cell change of the mobile station 1, must be taken into account, adapted to the estimated dynamics of the transmission channel 12 or determined specifically. Finally, it is also conceivable to support the location of the mobile station 1 by estimating the dynamics of the transmission channel 12.

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

Abstract

Selon l'invention, dans un système de téléphonie mobile, la modification temporelle de caractéristiques du canal de transmission (12) est évaluée, et, à partir de celle-ci, certains paramètres du système de radiotéléphonie mobile, tels que la fréquence d'autres mesures réalisées dans le système de téléphonie mobile, la transmission des rapports de mesure correspondants ou bien les zones d'enregistrement du système de téléphonie mobile affectées aux stations mobiles (1), sont adaptés. Ainsi, les ressources du système peuvent être mieux adaptées aux exigences effectives.
PCT/DE2000/001421 1999-08-05 2000-05-05 Procede d'adaptation aux caracteristiques d'un canal de transmission dans des systemes de telephonie mobile Ceased WO2001011813A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19936861 1999-08-05
DE19936861.9 1999-08-05

Publications (1)

Publication Number Publication Date
WO2001011813A1 true WO2001011813A1 (fr) 2001-02-15

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Application Number Title Priority Date Filing Date
PCT/DE2000/001421 Ceased WO2001011813A1 (fr) 1999-08-05 2000-05-05 Procede d'adaptation aux caracteristiques d'un canal de transmission dans des systemes de telephonie mobile

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005027244A1 (de) * 2005-06-13 2006-12-14 Infineon Technologies Ag Verfahren zum Anmelden einer Kommunikationseinrichtung in einem WLAN-Kommunikationsnetzwerk und Kommunikationseinrichtung

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0532485A2 (fr) * 1991-09-05 1993-03-17 Telefonaktiebolaget L M Ericsson Allocation adaptative de ressource dans un système de téléphonie mobile
EP0682417A2 (fr) * 1994-05-12 1995-11-15 Ntt Mobile Communications Network Inc. Contrôle de puissance de transmission réglant la puissance de transmission selon le nombre de bits de contrôle de puissance de transmission consécutifs ayant la même valeur
US5602831A (en) * 1995-03-31 1997-02-11 Seiko Communications Systems, Inc. Optimizing packet size to eliminate effects of reception nulls
WO1998056146A1 (fr) * 1997-06-06 1998-12-10 Siemens Aktiengesellschaft Procede d'adaptation variant dans le temps et dispositif de reception de donnees

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0532485A2 (fr) * 1991-09-05 1993-03-17 Telefonaktiebolaget L M Ericsson Allocation adaptative de ressource dans un système de téléphonie mobile
EP0682417A2 (fr) * 1994-05-12 1995-11-15 Ntt Mobile Communications Network Inc. Contrôle de puissance de transmission réglant la puissance de transmission selon le nombre de bits de contrôle de puissance de transmission consécutifs ayant la même valeur
US5602831A (en) * 1995-03-31 1997-02-11 Seiko Communications Systems, Inc. Optimizing packet size to eliminate effects of reception nulls
WO1998056146A1 (fr) * 1997-06-06 1998-12-10 Siemens Aktiengesellschaft Procede d'adaptation variant dans le temps et dispositif de reception de donnees

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
STEINER B: "PERFORMANCE ASPECTS OF AN MC/JC-CDMA MOBILE RADIO SYSTEM EMPLOYING NON CONTIGUOUS FREQUENCY BANDS", HOUSTON, TX, MAY 16 - 20, 1999,NEW YORK, NY: IEEE,US, vol. CONF. 49, 16 May 1999 (1999-05-16), pages 30 - 34, XP000901519, ISBN: 0-7803-5566-0 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005027244A1 (de) * 2005-06-13 2006-12-14 Infineon Technologies Ag Verfahren zum Anmelden einer Kommunikationseinrichtung in einem WLAN-Kommunikationsnetzwerk und Kommunikationseinrichtung

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