Changes between Version 20 and Version 21 of GEC16Agenda/WiMAX-Tutorial/Streamload/08


Ignore:
Timestamp:
07/17/13 19:46:14 (11 years ago)
Author:
Fraida Fund
Comment:

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  • GEC16Agenda/WiMAX-Tutorial/Streamload/08

    v20 v21  
    33== Revise, Repeat ==
    44
    5 After looking at the measurements collected by the 'wxmstat' application, we realize that the signal strength on the nodes is too high. The WiMAX CINR (a measure of signal quality) is 30 dB, which is very high, and so the maximum number of SVC layers (2) is downloaded in all cases. We want a more realistic environment, so we turn down the base station transmit power:
     5After looking at the measurements collected by the 'wxmstat' application, we realize that the signal strength on the nodes is too high. The WiMAX CINR (a measure of signal quality) is 30 dB, which is very high, and so the maximum number of SVC layers (2) is downloaded in all cases. We want a more realistic environment, so we turn down the base station transmit power from 40 dBm to 35 dBm:
    66
    77
    88{{{
    9 wget -qO- "http://wimaxrf:5052/wimaxrf/bs/set?bs_tx_power=15"
     9wget -qO- "http://wimaxrf:5052/wimaxrf/bs/set?bs_tx_power=35"
    1010wget -qO- "http://wimaxrf:5052/wimaxrf/bs/restart"
    1111}}}
     12
     13Confirm that the base station power is now set to 35:
     14{{{
     15wget -qO- "http://wimaxrf:5052/wimaxrf/bs/get?bs_tx_power" | xml_pp
     16}}}
     17
     18should output:
     19
     20{{{
     21<STATUS>
     22  <BaseStation>
     23    <bs_tx_power>
     24      <bs_tx_power>35</bs_tx_power>
     25    </bs_tx_power>
     26  </BaseStation>
     27</STATUS>
     28
     29}}}
     30
    1231
    1332He also uses the programmable attenuation on Sandbox 4 to create a situation where signal strength varies over the duration of the experiment. To do this, he adds some properties to the beginning of his experiment: