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**Q18: I get error, "problem Receiving samples". What do I do?**
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A18. This error means that there is real-time issue with sample acquisition. It happens as USB3 transfers are very sensitive to real-time performance. You should make sure all the steps related to CPU sleep, etc in HW/SW configuration are followed here, https://gitlab.eurecom.fr/oai/openairinterface5g/wikis/OpenAirSoftwareSupport, https://gitlab.eurecom.fr/oai/openairinterface5g/wikis/OpenAirKernelMainSetup#ubuntu-14043-ltslinux-kernel-version-319-recommended. You can also turn off WiFi/Bluetooth driver or in extreme case run your Linux without X Windows. Also, make sure your USRP is connected to USB3 port. If the problem persists, try doing USRP TX/RX benchmark tests and try to run OAI in 5 MHz(set N_RB_DL = 25) in eNodeB config file. You need to use latest i5/i7 (4 core minimum) PC for running OAI to avoid these kind of issues. You can also play around with CPU Affinity (see build_oai -h) to partition CPUs between lte-softmodem and USRP threads.
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A18. This error means that there is real-time issue with sample acquisition. If you are using USRP B210, then It happens as USB3 transfers are very sensitive to real-time performance. You should make sure all the steps related to CPU sleep, etc in HW/SW configuration are followed here, https://gitlab.eurecom.fr/oai/openairinterface5g/wikis/OpenAirSoftwareSupport, https://gitlab.eurecom.fr/oai/openairinterface5g/wikis/OpenAirKernelMainSetup#ubuntu-14043-ltslinux-kernel-version-319-recommended.
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**Q19: Phone is connected but does not want to accept IP Address. **
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- You can also turn off WiFi/Bluetooth driver or in extreme case run your Linux without X Windows. Also, make sure your USRP is connected to USB3 port. If the problem persists, try doing USRP TX/RX benchmark tests and try to run OAI in 5 MHz(set N_RB_DL = 25) in eNodeB config file. You need to use latest i5/i7 (4 core minimum) PC for running OAI to avoid these kind of issues. You can also play around with CPU Affinity (see build_oai -h) to partition CPUs between lte-softmodem and USRP threads.
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- If the issue persists, and the USRP or any other SDR is connected via USB3, then disconnect all the other USB devices from the eNB and work on it from remote session. The other USB devices can create negative impact on performance. Or you can buy USRP x310 and connect it via PCIe interface which is more reliable. http://www.ettus.com/product/details/X310-KIT
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**Q19: Phone is connected but does not want to accept IP Address.**
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A19: This might be due to mismatch of APN settings, https://lists.eurecom.fr/sympa/arc/openair5g-user/2016-10/msg00076.html
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