With the current implementation of oaisim
(rxdata and channel simulation), we cannot
call trx_read_func on a dummy buffer. The
code will actually modify the rxdata buffers
of the UE.
This is has to be rewritten properly. In the
meantime, let's introduce a simple hack. The
idea of the read at this point is to wait for
the synch to finish and not lose samples from
the hardware in the real UE. In the simulator,
as it is today, we can simply sleep until the
synch code has finished its work.
Added selection of interfaces through the configuration file with a new block of statements as follows:
FLEXSPLIT_INTERFACES :
{
DU_INTERFACE_NAME_FOR_F1U = "lo";
DU_IPV4_ADDRESS_FOR_F1U = "127.0.0.1/24";
DU_PORT_FOR_F1U = 2210;
CU_INTERFACE_NAME_FOR_F1U = "lo";
CU_IPV4_ADDRESS_FOR_F1U = "127.0.0.1"; //Address to search the DU
CU_PORT_FOR_F1U = 2210;
// One of TCP/UDP/SCTP
F1_U_TRANSPORT_TYPE = "UDP";
};
changes:
- ue mcc/mnc 208.93
- use correct key/opc for user
- change addresses in conf file for them to be easier to understand
(maybe)
With those changes, running:
sudo ./run_enb_ue_virt_s1
in cmake_targets/tools should work out of the box
The user still has to configure correct IP addresses in
targets/PROJECTS/GENERIC-LTE-EPC/CONF/enb.band7.generic.oaisim.local_mme.conf
We supposed oaisim (enb+ue) machine to be on IP address 10.0.1.1
and EPC (hss, mme, spgw) machine to be on IP address 10.0.1.2.
Several problems are present.
The first is that _write returns 0 instead of the
number of samples. We solve it by returning
nsamps.
The second is that _read may return less samples at
the beginning and we don't want to exit for that.
We solve it also by returning nsamps.
(We still need to log more in this, to be done in the
next commit.)
The third is that after initialization we don't send
anything for a while, time for the softmodem to finish
its init. This generates lots of "RX overrun".
We solve it by disabling TX and RX modules after init
and then in trx_brf_start we activate them again (and
also call bladerf_sync_config, which seems to be
mandatory, and bladerf_calibrate_dc, which may be avoided,
perhaps).
Maybe not the end of the story. Sometimes it works, UE connects,
traffic is fine (tested only with 5MHz). Sometimes it does not,
UE does not connect, or it connects but then traffic is bad,
especially uplink.
To be refined.
- rename UE_NO_LOG to DISABLE_LOG_X
because the name is misleading. The full software
is impacted, not only the UE part
- same for compilation option ---ue-no-log
that becomes --disable-log
- keep LOG_X for the standard case, that is the
case without DISABLE_LOG_X where printf has been
put. Two reasons:
* printf is not realtime friendly
* keep behavior similar for other users who may
be troubled by different logs that don't add
any benefit to previous logs
- print current working directory
- print git version (if available)
- print security keys
this last one is a security breach, but as of today
it's not a problem
Cedric Roux