VR5 DEE App Note - Spirent Knowledge Base
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1. SPIRENT Technical Note VR5 Dynamic Environment Emulation DEE February 2013 Spirent 541 Industrial Way West Eatontown NJ 07724 USA Email sales spirent com Web http www spirent com AMERICAS 1 800 SPIRENT 1 818 676 2683 sales Q9 spirent com EUROPE AND THE MIDDLE EAST 44 0 1293 767979 emeainfo spirent com ASIA AND THE PACIFIC 86 10 8518 2539 salesasia spirent com Copyright 2013 Spirent All Rights Reserved All of the company names and or brand names and or product names referred to in this document in particular the name Spirent and its logo device are either registered trademarks or trademarks of Spirent plc and its subsidiaries pending registration in accordance with relevant national laws All other registered trademarks or trademarks are the property of their respective owners The information contained in this document is subject to change without notice and does not represent a commitment on the part of Spirent The information in this document is believed to be accurate and reliable however Spirent assumes no responsibility or liability for any errors or inaccuracies that may appear in the document VR5 Dynamic Environment Emulation DEE TABLE OF CONTENTS Table Of Contents oriri ipe t HERD e Ed D Lie didi ELE aee PEL e ee Ld e deed i e D SEEE AT E A 2 Channel DYNAMICS 5 eint eee eterni e ree EI i e EA E ai oR EEE 3 DEE Features EM 5 DEE Specifications 5 i2. full control of the coherence time and bandwidth of the channel or the Doppler and delay spread or the spatial correlation SPIRENT APPLICATION NOTES 4 DEE FEATURES As explained before DEE allows the dynamic change in propagation conditions at specified time intervals The following parameters can be changed Output Port Settings Output Power AWGN Status ON OFF C N Ratio Propagation Condition Settings Path Status ON OFF Path Delay Relative Path Loss Rician Line of Sight Angle of Arrival Rician K Factor Frequency Shift Doppler Velocity MIMO Radio Links MIMO Radio Link Status ON OFF MIMO Radio Link Relative Power MIMO Radio Link Phase Correlation DEE is only available when the Fading Mode is set to Classical Channel Models The unique advantages of DEE in modeling the channel dynamics are Full control of delay spread and Doppler spread Full control of spatial correlation for SIMO MISO and MIMO Techniques Change of mobile velocity Long time simulation Full dynamic range of received signal power Multi cell simulation Mapping Channel Dynamics into DEE To utilize the unique advantages of DEE the following sections provide information on how to map the example scenario into the states of DEE in the VR5 DEE SPECIFICATIONS Maximum State Transition Time 400 us Measured from start of state change to completion of state change
3. AWGN Status Status Status Status State Duration Port B1 Output Port B2 Output PortB3 Output PortBAOutput Port BS Output Port B6 Output Port B7 Output Port BB Output 0 OFF 0 OFF 0 OFF 0 OFF 2 Comment Time Stamp mm ss 000 sec Power dBm Power dBm Power dBm Power dBm Power dBm Power dBm Power dBm Power dBm 1 ON 1 ON 1 ON 1 ON B 000 1000 a 5 6 7 s 5 10 nu 12 1 u 15 16 E 18 19 20 au 2 23 E S WKN Man Gupiopl Chios Popa Popa RINK Coneonl Cometa Coreana Coreuont 13 Tem H Ready Ena so Figure 4 New DEE Template DEE FOR HANDOVER TESTING Handover is an important aspect of mobility support for all wireless based technologies As the user moves around the strength of the received signal at the Mobile Station MS from the different Base Stations BS varies Handover is carried out when certain thresholds or requirements in the received signal are met The cell measurements at the MS are the basis for the decision making in the handover algorithms For this example assume that two 2x2 MIMO cells operating at different frequencies are received by the MS At first the power output from cell 1 is set to a high value whereas the output from cell 2 is set to a low value so the MS camps in cell 1 then the DEE engine is set to decrease the power of cell 1 at a rate of 2dB s and to increase the power of cell 2 at a rate of 2dB s as shown in Figure 5 fast fading was averaged out for clarity The resulting DEE
4. PortB7 Output PortB8 Output 0 OFF 2 Comment Time Stamp mm ss 000 sec Power dBm Power dBm Power dBm Power dBm Power dBm Power dBm Power dBm Power dBm 1 ON 3 00 01 000 1 000 30 00 30 00 4 00 02 000 30 00 30 00 5 00 03 000 30 00 30 00 6 00 04 000 30 00 30 00 7 00 05 000 30 00 30 00 8 00 06 000 30 00 30 00 9 00 07 000 30 00 30 00 10 00 08 000 30 00 30 00 u 00 09 000 30 00 30 00 12 00 10 000 30 00 30 00 13 00 11 000 30 00 30 00 14 00 12 000 30 00 30 00 15 00 13 000 30 00 30 00 E M 4 H Main Ch Propl Ch Prop2 Ch Prop3 Ch Prop4 RUnk Correlation Correlation Correlation3 Cormebton4 fJ T Tu nl Ready Average 30 00 Count 118 Sum 3540 00 EB E EN 100 C o Figure 9 DEE template file main tab et en ees Ere Calibri 1 Aw FHA E WwrapTet Custom E E Norma a xd z Fa Tk fai o r aA Paste bees A BES amp T re 4 2 02 Conditional Format Neural Checkcen Insert Delete Format Sort amp Find og cnt neg Beta v LH D Ay BBB EE Bdwege amp Cener 053823 Calculation Check Cell s le eee Pere Formatting as Table Filter Select Clipboard 7 Font A Alignment A Number ral Styles Cells Editing A14 M fe 12 00 13 AM Y P1 Status P2 Status State Duration Propagation 0 OFF P1 Relative Path P1LOS AOA PiFrequency Pi1Doppler 0 OFF P2Relative Path P2LOSA 1 Tim
5. paths presented at the mobile station vary This results in a change of delay spread because suburban areas typically have larger delay spread than urban areas The change of delay spread causes a change in the channel coherence bandwidth This may have a significant effect on performance because OFDM based technologies are especially sensitive to coherence bandwidth unless mitigation techniques such as frequency selective scheduling are employed Another obvious variation is in the received power Power fluctuation results in variation of the signal to noise ratio SNR Also environments can be characterized in the spatial domain where multipath richness changes the spatial correlation seen at the MS and BS antennas and this affects the performance of the particular MISO SIMO MIMO technique being used from simple receive diversity to beamforming to spatial multiplexing SPIRENT APPLICATION NOTES 3 VR5 Dynamic Environment Emulation DEE Different channel coherence time and bandwidth and spatial correlation have different impacts on system performance they are key design parameters for link adaptation algorithms With dynamic channel emulation test engineers can evaluate the end user s experience in these typical scenarios Another application of dynamic channel emulation is to verify link adaptation algorithms that explore the channel in time space and frequency domains To test the limits of the algorithm it is essential to have
6. 200 Prompt gt VRS gt 7 puts Setting DEE file to compile n a 8 VR5 cmd DEE compile file d ftproot spirent VR5 DEE Iput_vs_correlation xstb q 9 puts Begin Compiling DEE file IEEE VR5 cmd DEE COMPILE BEGIN C11 done false E 12 while not done 13 sleep 10 14 VR5 cmd DEE COMPILE STATUS c print c strip 1 if c include Completed 16 true 17 end 18 19 end 20 puts Enable DEE 21 VR5 cmd DEE STATE ON 22 puts begin playing 23 VR5 cmd play 24 25 sleep 100 26 27 puts Disconnecting 28 VR5 close SUMMARY AND CONCLUSIONS Dynamic Environment Emulation is a powerful tool provided by the VRS It allows the user to prescribe a wide variety of changes in propagation conditions that are executed dynamically This provides the user with the capability of recreating very particular circumstances to test algorithms deep within devices protocols system level RF engineering etc i SPIRENT
7. DEE Trigger Characteristics Trigger Signal TTL Rising Edge Trigger Signal Power 3 3 V Minimum Trigger Width 90 ns Trigger Delay from Trigger to Change in Output Level 5 0 ms Change in other parameters 1 0 ms IMPLEMENTING DEE WITH THE VR5 The first thing is to check that the license is enabled Please go to Help gt Instrument Options there verify that the feature called Dynamic Environment Emulation is present as shown below Name SW HW Feature ID Present Annual Service Agreement ASA ASA present AWGN Interferer sw AWGN present Bi Directionality Sw BIDIRECTIONAL present 100 MHz RF Bandwidth Sw BW 100 present Propagation Conditions Editor Sw CUSTOM EDITOR present LTE Conformance Model Pack Sw CONFORMANCE LTE present WCDMA Conformance Model Pack Sw CONFORMANCE WCDMA present GSM Conformance Model Pack Sw CONFORMANCE GSM present WiMAX Conformance Model Pack Sw CONFORMANCE_WIMAX present WLAN Conformance Model Pack Sw CONFORMANCE WLAN present Filtered Noise Fading Engine Sw MRFN present Geometric Channel Modes Fading Engine SW GCM present Cluster Based Channel Modeling Engine SW CLUSTER MOD present MIMO OTA Environment Builder Sw MIMO OTA present Automatic Phase Calibration Sw AUTO PHASE CAL present Dynamic Environment Emulation Sw DEE present 3000 3850 MHz Band Support Sw FREQ BAND 3500MHZ present 4000 6000 MHz Band Support Sw FREQ BAND 6000MHZ present Number of Internal LOs Sw VR5 FREQ MAX 4 RF Bandwi
8. E i 5 em ee vs Ix grippe A VR5 DEE Template E ee Quad 2x2 UniDirectional Fading Mode Classical Channel Model 1 Port Bl AWGN Status State Duration PortBiOutput PortB2Output PortB3Output PortB4Output PortBSOutput PortBGOutput PortB7 Output PortBSOutput 0 OFF Comment ime Stamp mm ss 000 sec Power dBm Power dBm Power dBm Power dBm Power dBm Power dBm Power dBm Power dBm 1 ON 3 00 00 500 500 30 00 30 00 110 00 110 00 4 00 01 000 31 00 31 00 109 00 109 00 5 00 01 500 32 00 32 00 108 00 108 00 6 00 02 000 33 00 33 00 107 00 107 00 7 00 02 500 34 00 34 00 106 00 106 00 8 00 03 000 35 00 35 00 105 00 105 00 3 00 03 500 36 00 36 00 104 00 104 00 10 00 04 000 37 00 37 00 103 00 103 00 u 00 04 500 38 00 38 00 102 00 102 00 12 00 05 000 39 00 39 00 101 00 101 00 13 00 05 500 40 00 40 00 100 00 100 00 14 00 06 000 41 00 41 00 99 00 99 00 15 00 06 500 42 00 42 00 98 00 98 00 E M 4 H Main Ch Propi Ch Prop2 Ch Prop3 Ch Prop4 Rink Correlationl Correlation Correlation3 Correbtiond fJ BEES 0 edt anl Ready Aaa 100 O VO Figure 6 DEE template file for the Handover example From Figure 6 we note that the state duration is 0 5 seconds and each state changes both B1 and B2 for cell 1 and B3 and B4 for cell 2 by 1dB giving the overall change rate of 2dB s As mentioned before this can change to whatever a particular test needs DEE FOR MIMO THROUGHPUT v
9. P1 Complex Correlation P2 Complex Correlation P3 Complex Correlation P4 Complex Correlation PS Complex Correlation P6 Complex Correlation P7 000 000 L000LTE 2 Low 4 4 140 0 0 0 0 0 0 0 0 1 0 040 0 4 4 1 0 0 0 040 0 0 0 0 1 0 0 0 0 4 4 1 0 0 0 0 0 0 0 0 0 1 0 0 0 0 4 4 140 040 0 0 0 0 0 0 1 0 0 0 0 4 4 1 0 0 0 0 0 0 0 0 0 140 040 0 4 4 1 0 0 0 0 0 0 0 040 1 0 0 0 0 4 4 150 030 050 040 040 LTE 20 Low LTE 20 Low LTE 20 Low LTE 20 Low LTE 20 Low LTE 20 Low LTE 20 Low ITE 20 Low LTE 2X Medium _4 4 1 0 0 5 0 0 3 0 0 27 0 0 9 0 1 4 4 140 0 940 0 3 0 0 2740 0 9 0 14 4 4 1 0 0 5 0 0 3 0 0 27 0 0 940 1 4 4 140 0 9 0 0 3 0 0 2740 0 5 0 14 4 4 140 0 5 0 0 3 0 0 27 070 9 0 1 4 4 140 0 9 0 0 3 0 0 27 0 0 5 0 14 44 140 0 830 0 330 0 27 lTE 20 Medium LTE 20 Medium lTE 20 Medium LTE 20 Medium lTE 20 Medium LTE 20 Medium lTE 20 Medium LTE 22 Low 44 1 0 040 0 0 0 0 040 1 0 0 0 0 4 4 140 0 0 0 0 0 0 0 0 1 0 0 0 04 4 4 1 0 0 0 0 0 0 0 0 0 1 0 0 0 0 4 4 140 0 0 0 0 0 0 0 0 1 0 0 0 0 4 4 1 0 0 0 0 0 040 0 0 1 0 040 0 4 4 1 0 0 0 0 0 0 0 0 0 1 0 0 0 0 4 4 1 0 0 0 0 0 0 0 0 0 LTE 2 Low LTE 2 Low LTE 2 Low lTE 2X2 High 4 4 1 0 0 540 0 940 0 8140 0 9 0 1 4 4 140 0 5 0 0 9 0 0 81 0 0 9 0 1 4 4 1 0 0 9 0 0 9 0 0 81 0 0 9 0 144 4 140 0 9 0 0 9 0 0 8140 0 940 1 4 4 1 0 0 9 0 0 5 0 0 81 0 0 9 0 1 4 4 1 0 0 9 0 0 9 0 0 81 0 0 5 0 1 4 4 1 0 0 940 0 5 0 0 81 LTE 2x2 High lTE 2X2 High LTE 2x2 High Figure 11 DEE t
10. dth Sw VR5 BW 100 MHz VDT CT Playback SW VDT PLAYBACK present Primary Sw PRIMARY present Secondary Sw SECONDARY present Number of RF Channels HW VR5 RF CHANNELS 8 Number of Digital Links HW VR5 DIG LINKS 32 10 MHz Reference TRANSITIONING If you would like to upgrade your instrument or request a trial password for any of the options listed please contact your Spirent Communications representative or send an email to pias Figure 2 DEE license verification Before discussing the DEE it is necessary to set all the parameters that are not changeable by DEE That is parameters that stay the same for the duration of the DEE operation Any parameter not listed on the DEE features above cannot be changed by DEE and therefore it needs to be set either using the GUI or through RPI commands Notable among those parameters are the center frequency the fading type associated with each path and the connection setup Then a new DEE template needs to be open The template can be open by going to the DEE gt New Emulation File menu on the VR5 front panel as shown in Figure 3 A new DEE template file that looks like the one shown in Figure 4 opens Notice that the connection setup matches that shown in Figure 3 however if this connection setup is not the desired one this can be changed directly in the DEE template by clicking on the connection setup drop down menu The emulation file can be modified using standard Excel methods The emulatio
11. e Stamp mm ss 000 sec Comment 1 ON PiDelay us Loss dB Deg P1K Factor dB Shift Hz Velocity km h 1 ON P2 Delay us Loss dB Deg 00 01 000 1 000 LTE_EPAS 1 0000 0 90 0 0 2 075 1 0300 1 0 3 0 02 00 LTE EPAS 4 00 03 000 LTE EPAS E 00 04 000 LTE EPAS 6 0 05 00 LTE EPAS EE 00 06 000 LTE_EPAS 3 0 07 00 LTE EPAS 9 00 08 000 LTE EPAS 30 00 09 000 LTE EPAS nj 00 10 000 LTE EPAS mj 00 11 000 LTE EPAS 13 00 12 000 LTE EPAS Ey 01 23 000 LTE EPAS 85 01 24 000 LTE_EPAS 86 01 25 000 LTE EPAS 87 01 26 000 LTE_EPAS 88 01 27 000 LTE EPAS 89 01 28 000 LTE EPAS 30 01 29 000 LTE_EPAS 91 01 30 000 LTE EPAS 32 38 4 4 B Ba 98 2 M 4 gt M Man Ch Prop1 lt Ch Prop2 Ch Prop3 lt Ch Prop4 lt RLink lt Correlation Correlation Correltion3 Corebtond fJ IKEM Anl Ready Count 0 Sum 0 Ana 2 0 65 Figure 10 DEE template file channel propagation 1 tab Finally each correlation matrix is changed after 30 seconds as shown in Figure 11 ibn HAL N i c ee mem c M di en 7 Ba cop 3H ic ya les BIU E Me Ae SEB SE Hiwee cmte tQ Con tons Format ETE Insert Delete Format Sort amp Find amp T QJ Format Painter U 8 a 4 FE Hve 5r B eating as table Be er A Gipboard A Font d Alignment A Number 3 Cets Eating Duration Complex Correlation 1 Time Stamp mm ss 000 sec ALL Complex Correlation
12. ei ee aT EEEE EE R 6 Implementing DEE with the VRS esssssssssesseseeseeer enne nre 7 DEE For Handover Testing ccccicccctecscscecsesscvandessacceessicavnccescacescenccevasesdazensticscunsansatays 9 DEE for MIMO Throughput vs Correlation Testing eee 11 ed B B EA 14 Summary and Conclusions cee ceecceeeceseeseeeeceeeeeeeseecaeecaaecsaecsaecsaecsaeenseeeeeeeseeeeeeeees 17 SPIRENT APPLICATION NOTES i VR5 Dynamic Environment Emulation DEE SCOPE The information contained in this document is the property of Spirent Except as expressly authorized in writing by Spirent the holder shall keep all information contained herein confidential shall disclose the information only to its employees with a need to know and shall protect the information from disclosure and dissemination to third parties Except as expressly authorized in writing by Spirent the holder is granted no rights to use the information contained herein If you have received this document in error please notify the sender and destroy it immediately SPIRENT APPLICATION NOTES 2 VR5 Dynamic Environment Emulation DEE CHANNEL DYNAMICS Suppose a user lives in suburban area Every morning he walks to the train station and rides into a city He then walks through the city to his office as he watches morning news video streams during his commute Figure 1 Different Channel Propagation Scenarios I
13. emplate file Correlation 1 tab RPI DEE So far all the DEE operations have been shown via GUI The VR5 provides the same functionality via RPI to support fully automated setups The following is a list of RPI commands related to DEE Please consult the VR5 user s manual and the RPI command reference for more details SYSTem DEE STATe Query Enable or disable DEE SYSTem DEE MODe Set the DEE Playback Mode to loop continuously to loop once or to loop a specific number of times SYSTem DEE TYPe Set or query the DEE Trigger Mode to Free Run HW Triggered or State Triggered SYSTem DEE CSTATe Query the current DEE state number SYSTem DEE CLOOP Query the current DEE loop number SYSTem DEE ETIMe Query the current DEE elapsed time SYSTem DEE NUMSTates Query the number of DEE states SYSTem DEE NUMLoops Set the number of loops to play DEE when DEE MODe is set to NUMber SYSTem DEE COMPile ABORt Abort the DEE compile SYSTem DEE COMPile BEGin Begin a DEE compile SYSTem DEE COMPile FILE Set and query the DEE emulation file for the given unit SYSTem DEE COMPile STATus Query the DEE compile status Possible Responses e Aborting e Abort command received but not finished processing Aborted Compile was aborted Completed Compile completed successfully Failed Compile Failed Compiling Compile in process reported during init
14. ial compile before individual unit compile begins Compiling Unit X Y Complete Compile in progress specifies unit and complete Compiling Unit X Complete Compile in progress reported when one unit is complete but the next not yet begun SYSTem DEE PAUSE Pause DEE fading or query DEE pause state SYSTem DEE PAUS EOnstate Pause DEE at a user specified state SYSTem DEE RESume Resumes normal DEE operation if DEE is paused SYSTem DEE ADVance Moves a DEE operation to the next state As an example the following Ruby script connects to the VRS points to the DEE file to compile this assumes the file Tput_vs correlation xstb already exists inside the VR5 at d ftproot spirent VR5 DEE compiles that file checks continuously for the compilation process to terminate sets the DEE state to on plays the DEE file and then disconnects DEE DEMO NetBeans IDE 724 File Edit View Navigate Source Refactor Run Debug Team Tools Window Help TE 9d J TY 8 DE CJ 9 calibration fie rb s 9 system cmd rb se Calibrate VRS with MXA MXG rb s 9 crosscorrelation rb s Crosscorrelation and Doppler 8X Vertical rb i p58 m qeofmseegseus2 S 1 puts DEE Demo Script 2 require net telnet 3 VR5_address 192 168 0 152 A c 5 puts Connect to VRS VR5 address split 1 2 6 VR5 Net Telnet new Host gt VR5 address Porrt gt 3000 Timeout gt
15. n file contains the following tabs Main ChProp one per independent connection in this example four RLINK and Correlation one per independent connection in this example four For the exact description of each tab please refer to the VR5 User s manual New Emulation Configuration Connection Setup Channel Model Quad 2x2 UniDirectional Propagation Conditions Default LTE 2x2 High Default Uncorrelated Default Uncorrelated Default Uncorrelated RF Setup and Measurement CARRIER INPUT OUTPUT AWGN Unit Expected Measured No Frequency MHz Port ENT SER Port SetPower Measured Measured dBm dBm dBm dBm Enable Units Set Ratio dB Ratio dB Enable US NNNM m __ 5 s NEEEN se O coo EN 00 00 00 0 STOPPED Connected to localhost Figure 3 Invoking a New Emulation File em x Peppe famis Outs ew 2o caG cation n Ax Tw Eee Custom H X 0 dod Good Neutral Calculation i z PF A BLU 5 5 EGG GR Hiesnoue 5 6 04 Condtiensi romat ITTE Sort amp Find amp matting as Table s 83 Fe 12 00 01 AM bd a m c T u v w x Y z aa az BA se 38 VR5 DEE Template Update Time stamp Gear Template Import DEE File Comecton Sup Export DEE File Quad 212 UnDrectonel lt Fading Mode Classical Charnel Modei z 1 PortBLAWGN PortB2AWGN PortB3AWGN Port B4
16. n this example the mobile station MS experiences a variety of different channel scenarios These include pedestrian and vehicular speeds in a suburban area followed by a pedestrian scenario in an urban environment These different scenarios have unique radio channel characteristics that may be favorable or adverse to the desired application voice real time video streaming web browsing etc In general the radio channel is described by channel models often pre defined to represent a particular environment type or use scenario For instance these pre defined models may include the ITU Pedestrian B and Vehicular A models that are common These models specify the number of delay taps their relative powers and specify a classical Doppler assumption for the fading behavior at predefined speeds spatial correlation in case of MIMO Many other models exist and engineers often modify these models or create new ones for particular purposes To model the Channel Dynamics of a MS moving through the various environments represented by this example several different channel models are defined in the DEE to represent the characteristics observed in each environment The channel dynamics can be characterized in time spatial and frequency domains When the mobile speed is low channel variation is slow and Doppler spread is small corresponding to large channel coherence time Due to the change of location the number relative power and delay of RF
17. s CORRELATION TESTING One of the fundamental parameters that affects MIMO throughput is correlation at both ends that is transmit and receive correlations DEE allows changing dynamically the correlation seen at the transmitter and receiver For this example we use an LTE 2x2 MIMO open loop spatial multiplexing technique For the entire emulation period the same propagation channel is used namely LTE EPAS see Figure 7 but the correlation matrix used changes from low correlation to medium correlation to low correlation to high correlation see Figure 11 agation Conditions Library Selected El E E E E E E E EH CDMA2000 gt ETU300 gt ETU7O gt EVA5 gt EVA7O gt High Speed Train O 3GPP MIMO OTA Ld SCME L3 UMTS WiMAX Wireless LAN L3 Wireless LAN TGac Wireless LAN TGn Lj User Created n at c 7 Paths 5 Hz L3 GSM Path 1 Ous 0dB Path 2 0 03 us 1 dB M MER Path 3 0 07 us 2 dB E Ga LTE Path 4 0 09 us 3 dB pe Path 5 0 11 us 8 dB nan 4345 an 30 Relative Power dB i 1 0 2 Delay us E Moving Propagatior E Birth Death Power Delay Profile 10 Figure 7 LTE EPA5 Channel model Then the throughput vs time is recorded and the change in throughput when the correlation is changed is presented in Figure 8 It is interesting to note the impact of the correlation on throughput At time 11s the correlation changes from low to medi
18. template file is shown in Figure 6 There will be a time in which the handover mechanism is triggered by the difference in the received powers You can easily define the rate of change of the cell power and the power level of each cell according to the test requirements Cell 1 Cell 2 Received power dBm 100 amp t Le ls f wa T M 30 35 40 45 50 55 60 Figure 5 Variation of Cell Power Emulated by DEE for Handover Testing The received cell power at the MS from the two base stations is controlled through DEE to emulate variations of path loss due to change of position This test setup can be modified according to the requirements of different standards It can also be easily extended to test handover under other more complex conditions such as the presence of AWGN and or with different fading profiles ld 9 eo emplatexlsx Read Only o Home Insert Pagelayout Formulas Data Review View c ge A E cut E B B Hgh OE Autosum Calibri n oA E General 3 E ali Bad Good pm ix 7 B5 o gt Bem i SEXES TE FA Paste T r A BES FF Bm om 38 398 Conditional Format Neutral Calculation EZ Insert Delete Format Sort amp Find amp qoare Bl 2 dr Ac rmm Renee 08 2 e oe z bclla TE de Clipboard A Font A Alignment A Number J Styles Cells Editing am GS Tous Scene mioss 00i __E A M
19. um and the throughput changes from 71Mbps to an average of 36Mbps that is a reduction of 50 The impact is even more dramatic at time 37 seconds where the correlation changes from low to high and the throughput changes to an average of 1 6Mbps or a reduction of 9896 LTE Data Throughput vs Correlation 80000 70000 60000 50000 30000 20000 10000 N a 2 x a amp 40000 bo gt e 10000 20000 30000 40000 50000 Tine ms Figure 8 Throughput vs correlation The DEE template file main tab is shown in Figure 9 Notice that the output power is fixed for the duration of the dynamic emulation Also the channel propagation is fixed to LTE EPA5 as shown in Figure 10 Mi 4 wis emplate risx Read Only Mic ES Hone TREE RN GST am a RR 20263 S y cut rum Ja c T mE y Barre Custom z d E Norma Bad Good E ir A p d A 2 Ba Copy x Paste z AC z EF g E 88 593 Conditional Format Neutral EE Insert Delete Format Sort amp Find amp J romat painter B 7 U E7 SA SF E ern Contes Sio gt MEER conde To ba e Pe ono Clipboard A Font A Alignment A Number A Styles Cells Editing M A 30 I d A B GEI y u v w x vi z AA AZ a VR5 DEE Template E Quad 232 UniDirectional Fading Mode Classical Channel Model 1 Port Bl AWGN Status State Duration PortBlOutput PortB2Output PortB3 Output PortB4 Output PortBSOutput PortB6 Output
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