EP2941915A1 - Verfahren und system zur prüfung von basisstationen eines mobilen telekommunikationsnetzes - Google Patents

Verfahren und system zur prüfung von basisstationen eines mobilen telekommunikationsnetzes

Info

Publication number
EP2941915A1
EP2941915A1 EP13802933.5A EP13802933A EP2941915A1 EP 2941915 A1 EP2941915 A1 EP 2941915A1 EP 13802933 A EP13802933 A EP 13802933A EP 2941915 A1 EP2941915 A1 EP 2941915A1
Authority
EP
European Patent Office
Prior art keywords
base stations
telecommunications network
mobile telecommunications
mobile
channel
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.)
Withdrawn
Application number
EP13802933.5A
Other languages
English (en)
French (fr)
Inventor
François Hamon
Yiqi Jiang
The Phuong NGUYEN
Damien Pouessel
Frédéric RIBLE
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.)
Ercom Engineering Reseaux Communications SAS
Original Assignee
Ercom Engineering Reseaux Communications SAS
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 Ercom Engineering Reseaux Communications SAS filed Critical Ercom Engineering Reseaux Communications SAS
Publication of EP2941915A1 publication Critical patent/EP2941915A1/de
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/0082—Monitoring; Testing using service channels; using auxiliary channels
    • H04B17/0087—Monitoring; Testing using service channels; using auxiliary channels using auxiliary channels or channel simulators
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/06—Testing, supervising or monitoring using simulated traffic
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports

Definitions

  • the present invention relates to the field of telecommunications.
  • the present invention relates more particularly to a method and system for emulating mobile terminals for testing base stations of a mobile telecommunications network.
  • the present invention applies to base stations called “eNodeB” as part of the fourth generation of mobile telecommunications: LTE or "Long Term Evolution”.
  • the present invention intends to overcome the disadvantages of the prior art by providing a method for emulating a large number of mobile terminals to test base stations of a telecommunications network.
  • the present invention reduces the computational complexity of a mobile multi-channel emulator.
  • the present invention relates, in its most general sense, to a method of laboratory testing of base stations of a mobile telecommunications network comprising a plurality of cells, characterized in that it comprises the following steps:
  • Emulating mobile terminals of a cell said mobile terminals transmitting data and transmitting / receiving calls in said cell through a base station;
  • said method applies to eNodeB-type base stations for LTE (Long Term Evolution) type networks.
  • said method implements a plurality of uplink multipath channels based on a single time-frequency transform processor.
  • said time-frequency transform processor is of the fast Fourier transform type.
  • said multipath channels are finite impulse response filters whose complex coefficients vary over time.
  • said multipath channels are applied in the so-called frequency domain before the time frequency transform.
  • the emulation of the channel is inserted inside the modulator which is made possible by the OFDMA waveform of the LTE (see Figure 2).
  • said multipath channels are frequency multiplexed before being applied to the signal transmitted by the mobile terminals.
  • This frequency multiplexing step makes it possible to apply a plurality of multipath channels associated with a plurality of mobile terminals by using a single vector multiplication operation. If one considers a temporal spread of FILTER_SIZE samples, this step of process makes it possible to obtain a gain of FILTER_SIZE * NB_UES.
  • said method implements an emulation of a plurality of variable distances between the base station and the independent mobile terminals on the basis of a single FFT (Fast Fourier Transform) processor.
  • FFT Fast Fourier Transform
  • the distance simultaneously emulates a delay of propagation and the weakening of the signal with regard to a law describing the decrease of the power of the signal.
  • said distance emulation is implemented in the form of a phase ramp in the frequency domain.
  • said method implements an emulation of a variation of the Doppler conditions on the basis of a single set of multipath path realizations, the Doppler speed being induced by the sub-sampling of this set of multipath channel embodiments, and a channel embodiment being associated with a temporal spread which varies according to the subsampling chosen.
  • said method ensures the continuity of the channel by symmetrical transposition of the channel embodiments, allowing a loopback without discontinuity.
  • said method further comprises a SINR (Signal to Interference plus Noise Ratio) compression step taking into account the Doppler effect, the estimation noise, the fading and the noise factor. of the receiver.
  • SINR Signal to Interference plus Noise Ratio
  • This method makes it possible to transpose standard block error rate plots under BBAG (Gaussian additive white noise) channel to the block error rate under multipath and Doppler channel conditions.
  • BBAG Gausian additive white noise
  • the innovation of this process is due to its implementation described below and also in that it combines the Doppler effect and the multipath channel in the SINR compression step (see Figures 2 and 3).
  • said method is implemented on the basis of a LUT (Look-Up Table) of the SINR (Signal to Interference plus Noise Ratio) compression emulation for the calculation of the BLER (Block Error Rate) in a downlink. (downlink) and CQI (Channel Quality Indicator) downlink.
  • LUT Look-Up Table
  • SINR Signal to Interference plus Noise Ratio
  • said method comprises a step of emulation of a channel MIMO (Multiple-lnput Multiple-Output) in process Downlink LTE (Long Term Evolution) by interacting on the return of Channel Quality Indicator (CQI), Rank Indicator (RI), Precision Matrix Index (PMI), and BLER (Block Error Rate) information.
  • CQI Channel Quality Indicator
  • RI Rank Indicator
  • PMI Precision Matrix Index
  • BLER Block Error Rate
  • said method also comprises a step of coherent propagation of the Tx power (transmission power), Tx fading (transmission fading), Channel Quality Indicator (CQI), Precoding Matrix Index (PMI), and Rank Indicator (RI) parameters. ), Doppler, BLER (Block Error Rate) downlink based on a delay line channel model and a distance profile.
  • Tx power transmission power
  • Tx fading transmission fading
  • CQI Channel Quality Indicator
  • PMI Precoding Matrix Index
  • RI Rank Indicator
  • said method implements uplink power dynamics on a respectively digital and analog partition of the dynamics specific to said mobile terminals and the cell-specific dynamics.
  • the present invention also relates to a laboratory test system of base stations of a mobile telecommunications network comprising a plurality of cells, characterized in that it comprises means for:
  • Emulating mobile terminals of a cell said mobile terminals transmitting data and transmitting / receiving calls in said cell through a base station;
  • Figure 1 illustrates the system according to the present invention in one embodiment
  • Figure 2a shows a modulator and an external channel emulator, according to the state of the art
  • Figure 2b illustrates a modulator including a channel emulator according to the present invention
  • FIGS 3 and 4 show the SINR compression step (Signal to Interference plus Noise Ratio), in the context of the method according to the present invention
  • FIG. 5 illustrates the frequency multiplexing of a plurality of multipath channels, in the context of the method according to the present invention.
  • FIGS 6 and 7 show the system according to the present invention in one embodiment. DETAILED DESCRIPTION OF THE EMBODIMENTS OF THE INVENTION
  • the system 100 and the method according to the present invention make it possible to emulate several hundred LTE compatible mobile terminals 30, 31, 32.
  • the method makes it possible to test in the laboratory base stations 10, 11, 12 of a mobile telecommunications network 20 comprising a plurality of cells 40, 41, 42,
  • the method according to the present invention comprises the following steps: • connection of a base station 10 at its antenna 50 to a test system 100 by means of a radio frequency cable 60
  • the emulated mobile terminals 30, 31, 32 stimulate the base station 10: they transmit calls, transmit data, in particular by means of an VoIP protocol ("VoIP").
  • VoIP Voice over IP
  • the base station 10 is thus stimulated in the laboratory, as it would be in a real environment.
  • the emulated mobile terminals 30, 31, 32 are contained in a chassis
  • the buildings, the movements of the mobile terminals 30, 31, 32 are simulated (for example in an automobile, or carried by a walking pedestrian).
  • the system 100 and the method according to the present invention make it possible to simulate:
  • the system 100 and the method according to the present invention make it possible to represent a realistic environment, taking into account the speed of the mobile terminals 30, 31, 32, their distance from the base station 10 and the environment (buildings, etc.)
  • Figure 1 illustrates the system 100 according to the present invention: a base station 10 communicates with mobile terminals 30, 31, 32 emulated.
  • the system 100 according to the present invention makes it possible to test in the laboratory base stations 10, 11, 12 of a mobile telecommunications network 20 comprising a plurality of cells 40, 41, 42.
  • This system 100 comprises means for:
  • Emulating mobile terminals 30, 31, 32 of a cell 40 said mobile terminals 30, 31, 32 transmitting data and transmitting / receiving calls in said cell 40 through a base station 10.
  • Figure 2a shows a modulator and an external channel emulator according to the state of the art.
  • Figure 2b illustrates a modulator including a channel emulator according to the present invention.
  • Figures 3 and 4 show the SINR compression step (Signal to Interference plus Noise Ratio), in the context of the method according to the present invention.
  • Figure 5 illustrates the frequency multiplexing of a plurality of multipath channels as part of the method of the present invention.
  • FIGS 6 and 7 show the system according to the present invention in one embodiment.
  • the system according to the present invention there is an independent channel emulator for each emulated mobile terminal.
  • the perceived channel is different.
  • the system according to the invention takes into account the possible buildings (and associated signal reflections) and the distance of each mobile terminal to the base station. This makes it possible to represent a realistic environment.
  • an IFFT-type function is shared for all emulated mobile terminals.
  • a FFT-type function is shared for all emulated mobile terminals.
  • a plurality of channel responses are applied in the frequency domain, taking advantage of the fact that in the LTE the resources used by the users are orthogonal in frequency, and a term-to-term multiplication is applied before application of a function of the IFFT type.
  • the method implements a plurality of uplink multipath channels based on a single Fast Fourier Transform (FFT) processor.
  • FFT Fast Fourier Transform
  • the responses are stored at the initialization of the system, in the presence of Doppler.
  • the channel instances that correspond to the lowest speed that you want to emulate are stored in memory.
  • the storage is performed so as to represent sufficient statistics of the channel.
  • the Doppler is emulated by subsampling the channel. This subsampling is performed according to the speed of the mobile terminal which has been parameterized.
  • the method according to the present invention provides continuity of the channel by symmetric transposition of channel realizations.
  • the method according to the present invention implements uplink power dynamics on a respective digital and analog partition of the dynamics specific to said mobile terminals (30, 31, 32) and the dynamics. cell-specific (40).
  • Downlink In one embodiment, information is reported by the mobile terminal to the base station so that the latter can make decisions.
  • the emulation of the channel is then performed by disregarding the channel at the physical level, and emulating the measurements reported on the base station (eNodeB). From channel realizations, we try to model the parameters that are supposed to be reported by the mobile terminal on the base station (eNodeB). Among these parameters are BLER (Block Error Rate), CQI (Channel Quality Indicator), PMI (Precoding Matrix Index) and RI (Rank Indicator). These parameters are directly dependent on the channel, and make it possible to model said downlink channel.
  • the method according to the present invention is implemented on the basis of a Look-Up Table (LUT) of the SINR (Signal to Interference plus Noise Ratio) compression emulation for the calculation of the BLER. (Block Error Rate) downlink and CQI (Channel Quality Indicator) downlink.
  • LUT Look-Up Table
  • SINR Signal to Interference plus Noise Ratio
  • CQI Channel Quality Indicator
  • said method further comprises a SINR (Signal to Interference plus Noise Ratio) compression step taking into account the Doppler effect, the estimation noise, the fading and the noise factor. of the receiver.
  • SINR Signal to Interference plus Noise Ratio
  • This method makes it possible to transpose standard block error rate plots under BBAG (Gaussian additive white noise) channel to the block error rate under multipath and Doppler channel conditions.
  • BBAG Gausian additive white noise
  • the innovation of this process is due to its implementation described below and also in that it combines the Doppler effect and the multipath channel in the SINR compression step (see Figures 2 and 3).
  • the SINR is compressed to account for Doppler velocity.
  • the SINR compression induced by the Doppler effect can be expressed according to the following formula [1] in the particular case of a SISO transmission:
  • Ps is the power of the signal and PN the power of the thermal noise and H00 the channel gain on the subcarrier. This expression can be extrapolated for the MIMO case by the following formula:
  • W being the precoding matrix defined in 3GPP specification TS3621 1.
  • the present invention proposes to pre-calculate and store in LUT (Look-Up Table) the following terms:
  • EESM Exposure Effective Signal to Interference and Noise Ratio Mapping
  • SINR- -a, ln (- £ exp ( ⁇ ))
  • the present invention proposes the following method: -Replace the log calculation of the exponential sum by the Jacobian algorithm with the additive correction term stored in a LUT.
  • Channel averaging by reducing the calculation of instantaneous SINRs for each subcarrier and each time index to one SINR per subset of subcarriers and time indexes.
  • the number of mobile terminals processed for each millisecond is equal to two or more times the number of available CPUs for the system.
  • the method according to the present invention comprises a step of emulation of a downlink (LTE) channel (LTE) by interacting on the return of the information.
  • LTE downlink
  • CQI Channel Quality Indicator
  • RI Rank Indicator
  • PMI Precision Matrix Index
  • BLER Block Error Rate
  • this implementation proposes to pre-calculate and store in LUT (Look-Up
  • EESM uses N pairs of values ⁇ , 0 (2 which are associated with N CQIs (Channel Quality Indicators) . This expression converges to the correct value if it has been calibrated with the good pairs of values of ⁇ .
  • the procedure is as follows: at each iteration, the pair of the previous iteration is used and the N pairs of adjacent pairs are tested. base pair at the next iteration Thus the computational complexity is limited to the test of (N "15) pairs and we suppose a convergence of the algorithm towards the optimal pair.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Mobile Radio Communication Systems (AREA)
EP13802933.5A 2013-01-04 2013-12-06 Verfahren und system zur prüfung von basisstationen eines mobilen telekommunikationsnetzes Withdrawn EP2941915A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1350050A FR3000856B1 (fr) 2013-01-04 2013-01-04 Procede et systeme de test de stations de base d’un reseau de telecommunications mobiles
PCT/EP2013/075775 WO2014106561A1 (fr) 2013-01-04 2013-12-06 Procede et systeme de test de stations de base d'un reseau de telecommunications mobiles

Publications (1)

Publication Number Publication Date
EP2941915A1 true EP2941915A1 (de) 2015-11-11

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EP13802933.5A Withdrawn EP2941915A1 (de) 2013-01-04 2013-12-06 Verfahren und system zur prüfung von basisstationen eines mobilen telekommunikationsnetzes

Country Status (4)

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US (1) US9819425B2 (de)
EP (1) EP2941915A1 (de)
FR (1) FR3000856B1 (de)
WO (1) WO2014106561A1 (de)

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FR3038487B1 (fr) 2015-06-30 2020-01-17 R-Interface Sas Procede et systeme de test de stations de base d'un reseau de telecommunications mobiles, prenant en compte les interferences sur la voie montante entre deux cellules adjacentes de maniere dynamique
US9686702B2 (en) 2015-07-06 2017-06-20 Viavi Solutions Inc. Channel emulation for testing network resources
EP3410768B1 (de) * 2016-03-31 2022-07-27 Huawei Technologies Co., Ltd. Signalübertragungsverfahren für endgerätevorrichtung sowie endgerätevorrichtung
US10581538B2 (en) 2016-07-28 2020-03-03 Ets-Lindgren, Inc. Distributed system for radio frequency environment simulation
US10014962B2 (en) * 2016-07-28 2018-07-03 Ets-Lindgren, Inc. Distributed system for radio frequency environment simulation
US10230479B2 (en) 2016-07-28 2019-03-12 ETS-Lindgren Inc. Distributed system for radio frequency environment simulation
US10009122B2 (en) 2016-07-28 2018-06-26 ETS-Lindgren Inc. Distributed system for radio frequency environment simulation
CN106488484A (zh) * 2016-12-23 2017-03-08 江苏中利电子信息科技有限公司 智能自组网数据终端通信基站的测试方法
CN111741483B (zh) * 2019-10-29 2022-08-09 青岛科技大学 移动通信系统的中断概率性能预测方法
CN113765549B (zh) * 2020-06-03 2023-04-07 华为技术有限公司 通信方法及装置

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Also Published As

Publication number Publication date
US20150341809A1 (en) 2015-11-26
FR3000856B1 (fr) 2015-02-06
FR3000856A1 (fr) 2014-07-11
US9819425B2 (en) 2017-11-14
WO2014106561A1 (fr) 2014-07-10

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