WO2002009326A1 - Reseau de radiocommunication cellulaire et procedes dans ce reseau - Google Patents

Reseau de radiocommunication cellulaire et procedes dans ce reseau Download PDF

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Publication number
WO2002009326A1
WO2002009326A1 PCT/SE2001/001662 SE0101662W WO0209326A1 WO 2002009326 A1 WO2002009326 A1 WO 2002009326A1 SE 0101662 W SE0101662 W SE 0101662W WO 0209326 A1 WO0209326 A1 WO 0209326A1
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WO
WIPO (PCT)
Prior art keywords
samples
power level
radio frequency
frequency channel
interference
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Application number
PCT/SE2001/001662
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English (en)
Inventor
Tomas Lundborg
Original Assignee
Telefonaktiebolaget L M Ericsson (Publ)
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.)
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Application filed by Telefonaktiebolaget L M Ericsson (Publ) filed Critical Telefonaktiebolaget L M Ericsson (Publ)
Priority to AU2001280343A priority Critical patent/AU2001280343A1/en
Publication of WO2002009326A1 publication Critical patent/WO2002009326A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/30—Monitoring; Testing of propagation channels
    • H04B17/309—Measuring or estimating channel quality parameters
    • H04B17/336—Signal-to-interference ratio [SIR] or carrier-to-interference ratio [CIR]
    • 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
    • H04L1/20—Arrangements for detecting or preventing errors in the information received using signal quality detector
    • H04L1/203—Details of error rate determination, e.g. BER, FER or WER
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/04—Large scale networks; Deep hierarchical networks
    • H04W84/042—Public Land Mobile systems, e.g. cellular systems

Definitions

  • the invention relates to a cellular radio communication network and methods in the network. More in particular, the invention concerns methods for estimating noise floor power levels and tuning signal strength thresholds in the cellular radio communication network.
  • Noice floor power levels i.e. power levels of omnipresent basic interference comprising thermal noise as well as assorted radio interference from a plurality of interfering sources, are known to be estimated in cells of cellular networks by measuring received signal strength of radio frequency channels in the uplink direction of said cells during periods when the uplink radio frequency channels are idle, i.e. while no mobile station operating in the respective cell is transmitting radio signals on the uplink radio frequency channels. Based on estimates of noice floor power levels derived from several measurement periods, operation and maintenance personnel selects appropriate signal strength threshold values for use in different functions affected by the noise floor power levels, such as intracell handoff, uplink power control etc and manually sets corresponding system control parameters of the radio communication network in accordance with the selected signal strength threshold values.
  • U.S. Patent 5,574,982 teaches a method and apparatus for stable regulation of transmission power level in a radio system.
  • a carrier-to-interference target that is a monotonically decreasing function of the current interference on the channel is used for regulating the transmission power level.
  • the current interference on the channel is determined based on an estimate of the current carrier-to-interference ratio, derived from a measured current bit error rate, and the measured current received signal strength.
  • a new carrier-to-interference target is selected and the transmission power level is updated to meet the new carrier-to-interference target.
  • new carrier-to-interference targets are selected and the transmission power level is updated at a preferred rate of once every 0.5 seconds.
  • the present invention addresses the problem of providing an improved way of estimating a noise floor power level in a cellular radio communication network which in particular provides more reliable noise floor power level estimates during busy hours and also enables a cellular radio communication network to estimate noise floor power levels of downlink radio frequency channels .
  • the problem is solved essentially by estimating a noise floor power level in a first cell in the cellular radio communication network based on low pass filtering in a slow low pass filter of interference level samples including interference level samples derived from received radio signals transmitted on a first radio frequency channel by at least one transmitter operating in the first cell.
  • the invention includes a method for estimating the noise floor power level, a method for tuning signal strength thresholds in the cellular radio communication network and a radio communication network having means implementing the methods . More specifically, the problem is solved by methods according to claim 1 and 21 and a cellular radio communication network ;laim 23.
  • One object of the invention is to provide more reliable estimates of a noise floor power level in a cell during busy hours .
  • Another object of preferred embodiments of the invention is to provide an increased accuracy of the noise floor power level estimates by not basing said estimates on signal quality samples primarily affected by temporary interference of significantly higher power than the noise floor.
  • Still another object of some embodiments of the invention is to enable a cellular radio communication network to estimate noise floor power levels of downlink radio frequency channels.
  • Yet another object of some embodiments of the invention is to reduce the amount of work required by operation and maintenance personnel for tuning a cellular network.
  • One advantage afforded by the invention is that more reliable estimates of a noise floor power level in a cell may be provided during busy hours.
  • Another advantage afforded by preferred embodiments of the invention is an increased accuracy of the noise floor power level estimates by reducing the risk that the basis of said estimates includes signal quality samples primarily affected by temporary interference of significantly higher power than the noise floor.
  • Still another advantage afforded by some embodiments of the invention is that they enable a cellular radio communication network to estimate noise floor power levels of downlink radio frequency channels. Yet another advantage afforded by some embodiments of the invention is that the amount of work required by operation and maintenance personnel for tuning a cellular network is reduced.
  • Fig. 1 is a view illustrating a radio communication system including a cellular network and mobile stations.
  • Fig. 2 is a diagram illustrating interference power on a radio frequency channel.
  • Fig. 3 is a flow diagram illustrating a basic method according to the invention for estimating a noise floor power level.
  • Fig. 4 is a flow diagram illustrating a first exemplary embodiment of a method according to the invention for estimating a noise power level in a time slot of an uplink radio frequency channel .
  • Fig. 5 is a flow diagram illustrating a second exemplary embodiment of a method according to the invention for estimating a noise power level in a time slot of a downlink radio frequency channel.
  • Fig. 6 is a flow diagram illustrating an exemplary embodiment of a method according to the invention for tuning signal strength thresholds in the radio communication network of Fig. 1.
  • Fig. 7 is a schematic block diagram illustrating function blocks in a first base station implementing the methods illustrated in Fig. 4-6.
  • Fig. 1 illustrates parts of an exemplary radio communication system 100 comprising a set of mobile stations MS1-MS4 and a cellular radio communication network 101, referred to as cellular network 101 in the following, in which the present invention is applied.
  • cellular network 101 comprises a mobile switching centre MSC1 and base stations BS1-BS5, including a first base station BS1, connected to the mobile switching centre MSC1.
  • the base stations BS1-BS5 provide radio coverage in a geographical area served by the mobile switching centre MSC1.
  • the mobile switching centre MSC1 is responsible for switching calls to and from mobile stations MS1-MS4 located in the geographical area served by the mobile switching centre MSC1.
  • Fig. 1 only includes elements deemed necessary for illustrating the present invention and that a typical cellular network comprises several mobile services switching centres, a greater number of base stations as well as other types of nodes such as home location registers.
  • the geographical area served by the mobile switching centre MSC1 is divided into a plurality of cells including cells C1-C5.
  • each cell C1-C5 radio coverage is provided by one of the base stations BS1-BS5 respectively, e.g. in a first cell Cl radio coverage is provided by the first base station BS1.
  • Transmissions of radio signals from any one of the base stations BS1-BS5 to the mobile stations MS1-MS4 are said to occur in the downlink direction while transmissions from any one of the mobile stations MS1-MS4 to any one of the base stations BS1-BS3 are said to occur in the uplink direction.
  • Each cell is allocated a group of radio frequency channels for providing radio communication in the cell.
  • TDMA time division multiple access
  • the physical channels can either be used as digital control channels (DCCH) , for providing communication of primarily control information between a base station and all mobile stations operating in a cell served by the base station, or as digital traffic channels (DTC) , for providing communication of primarily user data (e.g. speech) between a certain mobile station and the base station.
  • DCCH digital control channels
  • DTC digital traffic channels
  • the received radio signal must be of sufficient strength to enable it to be detected despite the presence of noise and interference on the radio frequency channel on which it was transmitted.
  • Fig. 2 is a schematic diagram providing an illustrating how the momentaneous level of aggregated noise and interference power on a radio communication channel typically may vary under a period of time.
  • the omnipresent basic interference is referred to as a noise floor and consists of thermal noise as well as assorted radio interference from a plurality of interfering sources while the more temporary bursts of interference typically originates from individual interfering sources. Due to its omnipresent nature, the noise floor power level is an essential factor affecting the performance of the radio communication system 100.
  • the noise floor power level on an uplink radio frequency channel in a cell is known to be estimated by measuring received signal ' strength on the radio frequency channel during periods when the uplink radio frequency channel is idle, i.e. no mobile station operating in the cell is transmitting radio signals on the uplink radio frequency channel.
  • the measurements proceeds for a specified measurement period of e.g. 1 hour or more, after which the noise floor power level is estimated by determining an average of the received signal strength during the measurement period.
  • the noise floor power level varies from cell to cell, radio frequency channel to radio frequency channel and may even vary from time slot to time slot on a certain radio frequency channel.
  • the noise floor power level also varies with time and in particular it is dependent upon the current traffic load in the communication system.
  • the number of radio transmitters emitting radio signals contributing to the noise floor power level also increases and furthermore these transmitters typically will transmit radio signals at higher power causing the noise floor power level to increase. Since the noise floor power level thus changes with time, the manually set threshold value parameters will cause less optimal performance of the concerned functions during periods of time when the actual noise floor power level differs from the noise floor power level estimate used as a basis for selecting the threshold values of said parameters.
  • Another problem is that certain radio frequency channels may be busy almost all the time during busy hours. This problem may in particular be present if functions, such as Interference Driven Channel Selection, are used which causes certain radio frequency channels to be selected for communication more often than others. For a radio frequency channel which is busy almost all the time during busy hour, it may not be possible to perform any or only a few received signal strength measurements while the radio frequency channel is idle. Thus the number of measured idle mode received signal strength samples may be insufficient to provide a reliable estimate of the busy hour noise floor power level .
  • Yet another problem is that it is not possible for a cellular network to estimate the noise floor power level of downlink radio frequency channels.
  • Still another problem with the current practice is that it causes quite a lot of tedious work for operation and maintenance personnel to tune a cellular network.
  • FIG. 3 illustrates a basic method according to the invention for estimating a noise floor power level in a first cell of a cellular network.
  • samples of signal-to-interference ratio and associated samples of received signal strength are provided for radio signals transmitted on a first radio frequency channel by at least one transmitter operating in the first cell.
  • the radio signals are transmitted as digitally modulated radio signals .
  • corresponding samples of interference level are calculated at step 302. If a sample of signal-to-interference ratio C/I and an associated received signal strength C are both presented in logaritmic form, the corresponding interference level sample I can be calculated as
  • the noise floor power level is continuously estimated at step 303 by performing low pass filtering in a slow low pass filter, i.e. a low pass filter having a time constant of at least 5 minutes, of a first sequence of interference level samples including at least some of the interference level samples calculated at step 302.
  • a slow low pass filter i.e. a low pass filter having a time constant of at least 5 minutes
  • the radio signals are transmitted by one or several mobile stations operating in the first cell and said signals are typically received and measurements on said signals performed by a first base station serving the first cell.
  • the radio signals are transmitted by the first base station serving the first cell and are typically received by one or several mobile stations operating in the first cell. Said mobile stations perform measurements on the digitally modulated radio signals received from the first base station and transmits measurement report messages, e.g TIA/EIA-136 Channel Quality Messages (CQM), to the radio communication network including measurement data, e.g. received signal strength and bit error rate, relating to said radio signals.
  • measurement report messages e.g TIA/EIA-136 Channel Quality Messages (CQM)
  • CQM Channel Quality Messages
  • the predetermined first power level may be set to a fixed threshold value e.g. 20-30 dB above a typical noise floor power level.
  • a typical value of the noise floor power level may be around -110 dBm and the predetermined first power level may thus e.g. be set to a value in the range of -80 dB to —90 dBm.
  • the predetermined first power level may be continuously adjusted in dependence of a current estimate of the noise floor power level.
  • the predetermined first power level may e.g. be defined as 20-30 dB above the current estimate of the noise floor power level.
  • Fig. 4 - Fig.6 illustrates how embodiments of methods according to the invention may be applied in the cellular network 101 of Fig. 1, and in particular how the invention is applied in a first cell Cl of the cellular network 101.
  • a first exemplary embodiment of a method according to the invention for noise floor power level estimation is applied to a first time slot TS1 on a first radio frequency channel RFl as well as other time slot/radio frequency channel combinations in the uplink direction of the first cell Cl while a second exemplary embodiment of a method according to the invention for noise floor power level estimation is applied to a second time slot TS2 on a second radio frequency channel RF2 as well as other time slot/radio frequency channel combinations in the downlink direction of the first cell Cl.
  • Fig. 4 illustrates noise floor power level estimation of the first time slot TS1 on the first radio frequency channel RFl in the uplink direction of the first cell Cl according to the exemplary first embodiment of the invention.
  • the first base station BSl serving the first cell Cl determines whether the first time slot TS1 on the first radio frequency channel RFl currently is idle, i.e. no mobile station operating in the first cell is currently transmitting a radio signal in the first time slot TS1 on the first radio frequency channel RFl, or not.
  • the first base station BSl measures a first sample of bit error rate (BER) and an associated sample of received signal strength (SS) at step 402.
  • BER bit error rate
  • SS received signal strength
  • the received signal strength sample is an average of received signal strength in the first time slot for a period of 0.52 seconds and the BER is also an average of received BER for the same period of 0.52 seconds, i.e. the samples are based on each occurence of the first time slot for a period of 0.52 seconds.
  • a check is made whether the power level of the received signal strength sample measured at step 402 is below a defined cut-off threshold.
  • the cut-off threshold is in this exemplary embodiment selected as 30 dB above a current estimate of the noise floor power level in the first time slot TS1 on the first radio frequency channel RFl .
  • the BER sample and associated received signal strength sample measured at step 402 are not used to update the noise floor power level estimate and processing continues at step 401.
  • the first base station BSl translates the BER sample measured at step 402 into a corresponding signal-to-interference ratio (C/I) sample at step 404 .
  • the translation may e.g. be performed in accordance with table 1 below.
  • an Interference level sample is ' calculated from the signal-to-interference level sample produced at step 404 and the associated received signal strength sample measured at step 402.
  • the interference level sample is preferrably calulated in accordance with expression (1) .
  • the interference level sample calculated at step 405 is input to a slow low pass filter having a time constant of typically 30 minutes.
  • the first base station BSl measures a sample of idle mode received signal strength (SS) at step 407.
  • SS idle mode received signal strength
  • the cut-off threshold is in this exemplary embodiment selected as 30 dB above a current estimate of the noise floor power level on the uplink radio frequency channel. If the idle mode received signal strength sample is above the cut-off threshold (an alternative NO at step 408) , the received signal strength is regarded as not being a sample of the noise floor power level and thus not representing a measure of the noise floor power level. Consequently, the idle mode received signals strength sample measured at step 408 is not used to update the noise floor power level estimate and processing continues at step 401.
  • the idle mode received signal strength sample is below the cut-off threshold (an alternative YES at step 408), the idle mode received signal strength sample measured at step 407 is input to the slow low pass filter at step 409.
  • processing returns to step 401.
  • Fig. 5 illustrates noise floor power level estimation of the second time slot TS2 on the second radio frequency channel RF2 in the downlink direction of the first cell Cl according to the exemplary second embodiment of the invention.
  • a mobile station e.g. mobile station MSI, which has been assigned a digital traffic channel mapped on to the second time slot TS2 on the second radio frequency channel RF2, measures samples of bit error rate (BER) and associated samples of received downlink signal strength (SS) for radio signals received from the first base station BSl in the second time slot TS2.
  • BER bit error rate
  • SS received downlink signal strength
  • each bit error rate sample and associated received downlink signal strength sample are measured as average values during a 1 second period, i.e. the samples are based on each occurence of the second time slot TS2 for a period of 1 second.
  • the measured bit error rate and signal strength samples are reported to the first base station BSl in a channel quality message (CQM) on a slow associated control channel portion of the digital traffic channel.
  • CQM channel quality message
  • the described bit error rate and signal strength measurement and reporting are well known to a person skilled in the art as part of the mobile assisted handoff function in TIA/EIA-136.
  • the first base station BSl receives a channel quality message containing measurement data including a bit error rate sample and associated downlink received signal strength sample reported by the mobile station MSI for radio signals transmitted by the first base station BSl in the second time slot TS2 on the second radio frequency channel RF2.
  • a check is made whether the power level of the downlink received signal strength sample received in the channel quality message is below a defined cut-off threshold.
  • the cutoff threshold is in this exemplary embodiment selected as 30 dB above a current estimate of the noise floor power level in the second time slot TS2 on the second radio frequency channel RF2.
  • the BER sample and associated received signal strength sample received in the channel quality message at step 501 are not used to update the noise floor power level estimate and processing continues at step 501.
  • the first base station BSl translates the BER sample received in the channel quality message at step 501 into a corresponding signal- to-interference ratio (C/I) sample at step 404.
  • the translation may e.g. be performed in accordance with table 1.
  • an Interference level sample is calculated from the signal-to-interference level sample produced at step 503 and the associated downlink received signal strength sample recived in the channel quality message at step 501.
  • the interference level sample is preferrably calulated in accordance with expression (1) •
  • the interference level sample calculated at step 504 is input to a slow low pass filter having a time constant of typically 30 minutes.-
  • Fig. 6 illustrates how the noise floor power level estimates estimated in accordance with Fig. 4 or Fig. 5 may be used for automatically tuning signal strength thresholds in the cellular network 101 of Fig. 1 and more in particular for tuning signal strength thresholds in the first base station BSl.
  • the current estimate of the noise floor power level in a certain time slot on a certain radio frequency channel is read from the output of the slow low pass filter associated with said time slot and radio frequency channel combination.
  • At step 602 at least one signal strength threshold is automatically set in dependence of the estimated noise floor power level. After step 602, processing returns to step 601.
  • the method for tuning signal strength thresholds illustrated in Fig. 6 may e.g. be used to tune signal strength thresholds defining minimum signal strength in the uplink or downlink required for performing intracell handoff.
  • the method illustrated in Fig. 6 may be used to tune signal strength thresholds defining a minimum power level for downlink or uplink power control.
  • Fig. 7 illustrates in a schematic block diagram logical function blocks in the first base station BSl implementing the methods illustrated in Fig. 4-6.
  • the first base station BSl comprises a signals measurer block 701, a measurement report receiver block 702, a selector block 703, a translator block 704 a calculator block 705 an estimator block, 706 and a threshold manager block 707.
  • the signal measurer block 701 performs both busy mode and idle mode signal measurements on time slots of uplink radio frequency channels, e.g. the first time slot TS1 on the first radio frequency channel RFl. For busy mode measurements, the signal measurer 701 measures and outputs sample pairs 710 of bit error rate samples and associated signal strength samples. For idle mode measurements, the signal measurer measures and outputs idle mode signal strength samples 711.
  • the measurement report receiver block 702 receives measurement report messages 721, i.e. Channel Quality Measurement (CQM) messages, reporting measurement results of measurements performed by mobile stations operating within the first cell Cl and including samples of bit error rate and associated received signal strength for downlink radio frequency channels in the first cell Cl such as the second radio frequency channel RF2.
  • CQM Channel Quality Measurement
  • the measurement report receiver block 702 extracts said samples of bit error rate and associated received signal strength and provides them as output data sample pairs 712.
  • the selector block 703 receives the output data 710-712 from the signal measurer block 701 and the measurement report receiver block 702. The selector block 703 selects which uplink sample pairs 710 and uplink idle mode signal strength samples 711 should be used as a basis for estimating noise floor power levels in the uplink direction as well as which downlink sample pairs 712 should be used as a basis for estimating noise floor power levels in the downlink direction. In this exemplary embodiment, the selector block 703 selects to use all idle mode signal strength samples 711 and all uplink and downlink sample pairs 710, 712 having a received signal strength below 30 dB above a current estimate of the respective noise floor power level. Thus all other idle mode signal strength samples 711 and sample pairs 710, 712 are discarded. The selector block 703 provides the selected idle mode signal strength samples 711 to the estimator block 706 while the selected uplink sample pairs 710 and the selected down link sample pairs 712 are provided to the translator block 704.
  • the translator block 704 translates the bit error rate samples in the uplink and downlink sample pairs 710, 712 into corresponding signal-to-interference ratio samples.
  • the translator block 704 provides a corresponding sample pair 713 of signal-to-interference ratio and associated received signal strength while for each downlink sample pair 712 received by the translator block 704, the translator block 704 provides a corresponding sample pair 714 of downlink signal-to-interference ratio and associated received signal strength.
  • the calculator block 705 calculates interference level samples 715 and 716 respectively from the uplink sample pairs 713 and downlink sample pairs 714 it receives from the translator block 704.
  • the calculator block 705 calculates the interference samples 715-716 in accordance with expression (1) .
  • the estimator block 706 includes a number of slow low pass filters each having a time constant of 30 minutes. There is one low pass filter for each separate noise floor power level being estimated.
  • the estimator block 706 includes e.g. a first low pass filter 708 associated with the first time slot TS1 on the first radio frequency channel RFl and a second low pass filter 709 associated with the second time slot TS2 on the second radio frequency channel RF2.
  • a low pass filter associated with a time slot on an uplink radio frequency channel e.g. the first low pass filter 708, performs low pass filtering of a sequence of interference level samples including calculated interference level samples 715 received from the calculator block 705 as well as idle mode received signal strength samples 711 received from the selector block 703.
  • a low pass filter associated with a time slot on a downlink radio frequency channel e.g. the second low pass filter 709, performs low pass filtering of a sequence of interference level samples including only calculated interference level samples 716 received from the calculator block 705.
  • the noise floor power level estimates are provided as output from the repective low pass filter.
  • the first low pass filter 708 provides an estimate 717 of the noise floor power level in the first time slot on the first radio frequency channel in the uplink direction while low pass filter 709 provides an estimate 718 of the noise floor power level in the second time slot on the second radio frequency channel in the downlink direction.
  • the threshold manager block 707 sets signal strength threshold values 719-720 in the base station BSl in dependence of the current estimates of noise floor power levels provided by the estimator block 706.
  • the signal measurer block 701 and measurement report receiver block 702 together with the translator block 704 functions as sample providing means for providing the uplink and downlink sample pairs 713-714.
  • the selector block 703 functions as a sample selection means controlling which interference level samples are included in the sequence of samples used as input to the respective slow low pass filter.
  • a single noise floor estimate could be determined for the radio frequency channel by using interference level samples from several or all time slots on the radio frequency channel as input to a single slow low pass filter.
  • a noise floor power level estimate common to a plurality of radio frequency channels could be provided by including interference level samples derived from said plurality of different radio frequency channels as input data to a single common low pass filter.
  • the noise floor power level may vary from time slot to time slot, separate noise floor power level estimates are preferrably determined for each time slot.
  • signal-to- interference ratios can either be measured directly or other signal quality measures, such as frame erasure rate, word error rate or burst quality, can be measured and translated into corresponding signal-to-interference ratios. Note that the new TIA/EIA-136 Extended Channel Quality message supports reporting of several different signal quality measures.
  • application of the invention is in no way limited to only cellular radio communication networks conforming to the EIA/TIA-136 specifications.
  • the invention is also applicable in cellular networks adhering to e.g. the GSM- or PDC, specifications .

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

Abstract

L'invention concerne un procédé et un réseau de radiocommunication cellulaire évaluant un niveau de puissance du bruit de fond dans une première cellule du réseau de radiocommunication cellulaire. Ce procédé consiste: - à fournir (301) des échantillons du rapport signal/brouillage et des samples associés de l'intensité du signal pour les signaux transmis sur un premier canal de fréquence radio par des émetteurs fonctionnant dans la première cellule (301) ; - à calculer (302) les échantillons de niveau de brouillage correspondant aux échantillons du niveau signal/brouillage et les échantillons associés de l'intensité des signaux (302) ; - à évaluer en continu (303) le niveau de puissance du bruit de fond par filtrage passe-bas d'une séquence d'échantillons du niveau de brouillage incluant au moins certains des échantillons de niveau de puissance calculés. Les seuils d'intensité des signaux dans le réseau de radiocommunication cellulaire peuvent être réglés automatiquement en fonction du niveau de puissance du bruit de fond évalué.
PCT/SE2001/001662 2000-07-26 2001-07-20 Reseau de radiocommunication cellulaire et procedes dans ce reseau WO2002009326A1 (fr)

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AU2001280343A AU2001280343A1 (en) 2000-07-26 2001-07-20 A cellular radio communication network and methods in the network

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SE0002797A SE517040C2 (sv) 2000-07-26 2000-07-26 Förfarande för att estimera grundbruseffektnivåer och inställning av signalstyrketrösklar

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EP1919231A1 (fr) * 2005-08-23 2008-05-07 NEC Corporation Méthode de communication radio pouvant réduire les interférences inter-cellules, système et sa station mobile et sa station de base
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US7489901B2 (en) * 2004-09-30 2009-02-10 Alcatel-Lucent Usa Inc. Method for dynamically estimating noise floor and rise over thermal (ROT)
WO2006076969A1 (fr) * 2005-01-21 2006-07-27 Telefonaktiebolaget Lm Ericsson (Publ) Procedes et dispositifs d'estimation de charge de liaison montante
US7848743B2 (en) 2005-01-21 2010-12-07 Telefonaktiebolaget Lm Ericsson (Publ) Methods and devices for uplink load estimation
CN101103563B (zh) * 2005-01-21 2011-11-23 艾利森电话股份有限公司 用于上行链路负载估算的方法和装置
EP1919231A1 (fr) * 2005-08-23 2008-05-07 NEC Corporation Méthode de communication radio pouvant réduire les interférences inter-cellules, système et sa station mobile et sa station de base
EP1919231A4 (fr) * 2005-08-23 2012-01-25 Nec Corp Méthode de communication radio pouvant réduire les interférences inter-cellules, système et sa station mobile et sa station de base
US8542655B2 (en) 2005-08-23 2013-09-24 Nec Corporation Radio communication method and system capable of reducing inter-cell interference, and its mobile station and base station
EP2814190A3 (fr) * 2010-06-29 2015-01-21 Qualcomm Incorporated Procédé et appareil pour atténuer une interférence dans des déploiements de femtocellule
CN103166721A (zh) * 2011-12-12 2013-06-19 苹果公司 用于测试射频功率放大器性能的方法和装置
US8983395B2 (en) 2011-12-12 2015-03-17 Apple Inc. Methods and apparatus for testing radio-frequency power amplifier performance
CN103166721B (zh) * 2011-12-12 2016-01-13 苹果公司 用于测试射频功率放大器性能的方法和装置

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SE0002797D0 (sv) 2000-07-26
AU2001280343A1 (en) 2002-02-05
SE517040C2 (sv) 2002-04-09

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