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

Prerequisites

1. Two nodes, with appropriate hardware, within RF range
2. Currently supported: USRP x310, USRP 2974, USRP b210
3. Load the image omf-baseline-oai-1804.ndz onto both nodes
4. Turn the nodes on
5. 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
2. edit the file /opt/oaiscripts/run_enb.sh for the SDR in use, for example, set SDR IP addr and max gain
3. run /opt/oaiscripts/run_enb.sh

On Node 2

1. run /opt/oaiscripts/build_oai.sh to build for the current hardware and kernel
2. edit the file /opt/oaiscripts/run_ue.sh for the SDR in use, for example, set SDR IP addr and max gain
3. 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"
2. on eNB, set att_tx=70, att_rx=10
3. 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"
2. 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"
2. configure RF matrix for 60db of attenuation between eNB and UE node chosen