wiki:Resources/Services/RFControl

Version 8 (modified by msherman, 5 years ago) ( diff )

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RF Control

This service is used to configure the RF front ends of the nodes. The functionality follows the descriptions and details on the RF front end page (eg. setting the filters for one TX chain applies the setting to both TX chains of the node).

NOTE: Where node names are required, please use the fully qualified domain name (FQDN) of the node (eg. sdr1-s1-lg1.bed.cosmos-lab.org).


Usage

All the available methods are accessible from the a testbed console via an HTTP API located at am1.cosmos-lab.org:5054/rf_control. This API can be interacted with via a command line tool such as "curl" or any script using a "REST client" library.


Get the current configuration

This API call is used to get the current configuration of the RF front end(s) with respect to a node or list of nodes. The response will specify the parameters of the TX chain for the node(s) in question. It will show for a given node's rf_port, what antenna would be used if it were connected, whether the power amplifier (power_amp) is on or off, and the lower frequency (f_lower) and upper frequency (f_upper) of the filters.

HTTP API Path: am1.cosmos-lab.org:5054/rf_control/get_tx_path

Parameters:

Name Decription Required Acceptable Input
node Comma separated list of node FQDNs Y (list of nodes)


Example 1

HTTP Request: 

am1.cosmos-lab.org:5054/rf_control/get_tx_path?node=sdr1-s1-lg1.bed.cosmos-lab.org

Response: 

<response status="OK">
  <nodes>
    <node name="sdr1-s1-lg1.bed.cosmos-lab.org">
      <rf_port number="0" antenna="1" connected="true" power_amp="ON" f_lower="4900" f_upper="6200"/>
      <rf_port number="1" antenna="3" connected="true" power_amp="ON" f_lower="4900" f_upper="6200"/>
      <rf_port number="2" antenna="" connected="false"/>
      <rf_port number="3" antenna="" connected="false"/>
    </node>
  </nodes>
</response>

In this example, node sdr1-s1-lg1.bed.cosmos-lab.org has:

  • TX of rf_port 0, connected to antenna 1, its power amplifier is on, and the filters are set to 4900-6200MHz
  • TX of rf_port 1, connected to antenna 3, its power amplifier is on, and the filters are set to 4900-6200MHz
  • TX of rf_port 2 is not connected to anything
  • TX of rf_port 3 is not connected to anything


Example 2

HTTP Request: 

am1.cosmos-lab.org:5054/rf_control/get_tx_path?node=sdr1-s1-lg1.bed.cosmos-lab.org,sdr2-s1-lg1.bed.cosmos-lab.org

Response: 

<response status="OK">
  <nodes>
    <node name="sdr1-s1-lg1.bed.cosmos-lab.org">
      <rf_port number="0" antenna="1" connected="false" power_amp="OFF" f_lower="4900" f_upper="6200"/>
      <rf_port number="1" antenna="3" connected="false" power_amp="OFF" f_lower="4900" f_upper="6200"/>
      <rf_port number="2" antenna="" connected="false"/>
      <rf_port number="3" antenna="" connected="false"/>
    </node>
    <node name="sdr2-s1-lg1.bed.cosmos-lab.org">
      <rf_port number="0" antenna="1" connected="true" power_amp="OFF" f_lower="4900" f_upper="6200"/>
      <rf_port number="1" antenna="3" connected="true" power_amp="OFF" f_lower="4900" f_upper="6200"/>
    </node>
  </nodes>
</response>


Turn off power amplifiers

This API call is simply a shorthand to easily turn off the power amplifiers for a given node. Keep in mind that power amplifier state is shared between nodes in the same physical location (eg. sdr1-md1.bed.cosmos-lab.org and sdr2-md1.bed.cosmos-lab.org).

HTTP API Path: am1.cosmos-lab.org:5054/rf_control/power_amp_off

Parameters:

Name Decription Required Acceptable Input
node Comma separated list of node FQDNs Y list of node names


Example 1

Turn off the power amplifier for sdr1-s1-lg1.bed.cosmos-lab.org.

HTTP Request: 

am1.cosmos-lab.org:5054/rf_control/power_amp_off?node=sdr1-s1-lg1.bed.cosmos-lab.org

Response: 

<response status="OK">
  <message>OK</message>
</response>


Configure the TX chain

HTTP API Path: am1.cosmos-lab.org:5054/rf_control/set_tx_path

Parameters:

Name Decription Required Acceptable Input
node Comma separated list of node FQDNs Y (list of node names)
rf_port Node RF port to configure Y 0, 1
power_amp Power amplifier state N on, off
f_center Center frequency of range requested * (frequency in MHz)
f_bandwidth Bandwidth of frequency range requested * (frequency in MHz)
f_lower Lower end of frequency range requested * (frequency in MHz)
f_upper Upper end of frequency range requested * (frequency in MHz)

* The filter frequency selection parameters are not required if all are committed. However, to select a frequency range, at least two are required using the following format.

1st Parameter 2nd Parameter Effective Frequency Range
f_center f_bandwidth (f_center - f_bandwidth/2) to (f_center + f_bandwidth/2)
f_upper f_lower (f_lower) to (f_upper)
f_lower f_bandwidth (f_lower) to (f_lower + bandwidth)
f_upper f_bandwidth (f_upper - bandwidth) to (f_upper)


Example 1

For sdr1-s1-lg1 in bed testbed, connect TX RF ports 0 and 1 to their respective antennas, turn on the power amplifier, and request a frequency of 2.4-2.5 GHz.

HTTP Request: 

am1.cosmos-lab.org:5054/rf_control/set_tx_path?node=sdr1-s1-lg1.bed.cosmos-lab.org&rf_port=0,1&power_amp=on&f_lower=2400&f_upper=2500

Response: 

<response status="OK">
  <message>OK</message>
</response>
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