This tutorial contains instructions for running the openairinterface eNB and UE on various platforms.

== Prerequisites ==
1. Two nodes, with appropriate hardware, within RF range
1. Currently supported: USRP x310, USRP 2974, USRP b210
1. Load the image {{{omf-baseline-oai-1804.ndz}}} onto both nodes
1. Turn the nodes on
1. If graphical display is desired, enable x11 tunneling to console and then to nodes

== On node 1 ==
1. run /opt/oaiscripts/build_oai.sh to build for the current hardware and kernel
1. edit the file /opt/oaiscripts/run_enb.sh for the SDR in use, for example, set SDR IP addr and max gain
1. run /opt/oaiscripts/run_enb.sh

== On Node 2 ==
1. run /opt/oaiscripts/build_oai.sh to build for the current hardware and kernel
1. edit the file /opt/oaiscripts/run_ue.sh for the SDR in use, for example, set SDR IP addr and max gain
1. run /opt/oaiscripts/run_ue.sh


== Understanding xforms terms and plots ==
* Explanations from:
  * https://www.mathworks.com/help/lte/physical-channels.html

* PBCH: physical broadcast channel
  * The PBCH carries part of the system information required for terminals to access the network
* PUSCH: physical uplink control channel
* PDCCH: physical downlink control channel
  * The PDCCH conveys control information, scheduling decisions for PDSCH reception, and for scheduling grants enabling transmission on the PUSCH.
* PUSCH: physical uplink shared channel
* PDSCH: physical downlink shared channel
  * The PDSCH carries user data and paging information to the terminal.

== Calibration ==
* physical attenuation
* received signal at UE
* received signal at eNB
* pdsch constellation at UE
* pdsch constellation at eNB

== Expected Performance ==
This depends on a number of factors, including:
* the total bandwidth (number of resource blocks)
  * 5mhz:25prb
  * 10mhz:50prb
  * 20mhz:100prb
* p(d/u)sch modulation:
  * qpsk
  * 16qam
  * 64qam
  * 256qam
* FDD vs TDD
* number of MIMO channels
* control vs data channel split

For the default config file in this tutorial, it's:
* 1/1 non-mimo
* FDD band 7
* 5mhz/25PRB
* up to 256qam, depending on signal
* control / data split of (0.25/0.75?)
* so you can expect up to 19mbps downlink at 64qam, and 25mbps downlink at 256qam


== Specifics per domain ==
=== sb2.cosmos-lab.org ===
1. set usrp address to "type=x3xx,resource=rio0"
1. on eNB, set att_tx=70, att_rx=10
1. use RFSWITCH service to set all switches to port 1 for antenna

=== sb2.orbit-lab.org ===
1. set usrp address to "type=x3xx,addr=192.168.40.2"
1. bring up usrp ethernet interface, set ip to 192.168.40.1/16

=== sb1.orbit-lab.org ===
1. set usrp address to "type=b210"

=== sb4.orbit-lab.org ===
1. set usrp address to "type=b210"
1. configure RF matrix for 60db of attenuation between eNB and UE node chosen