srsENB currently creates 1 zmq stream (1 tx, 1 rx) for each cell (2 if
MIMO is enabled). Each cell transceives on a given EARFCN (and several
cells can transmit on same EARFCN).
However, for handover test purposes, we want to join all cells operating
on the same EARFCN to transceive on the same ZMQ conn, so that an srsUE
can interact with them at the same time (same as if the medium was shared).
Furthermore, we want to set different gains on each of those paths
before merging them in order to emulate RF conditions like handover.
In order to do so, a new element called the Broker is introduced, which
is placed in between ENBs and UEs ZMQ conenctions, multiplexing the
connections on the ENB side towards the UE side.
A separate process for the broker is run remotely (ENB run host) which
listens on a ctrl socket for commands. An internal Broker class is used
in osmo-gsm-tester to interact with the remote script, for instance to
configure the ports, start and stop the remote process, send commands to
it, etc.
On each ENB, when the rfemu "gnuradio_zmq" rfemu implementation is selected
in configuration, it will configure its zmq connections and the UE ones to
go over the Broker.
As a result, that means the UE zmq port configuration is expected to be
different than when no broker is in used, since there's the multiplexing
per EARFCN in between.
In this commit, only 1 ENB is supported, but multi-enb support is
planned in the future.
The handover test passes in the docker setup with this config:
"""
OSMO_GSM_TESTER_OPTS="-T -l dbg -s 4g:srsue-rftype@zmq+srsenb-rftype@zmq+" \
"mod-enb-nprb@6+mod-enb-ncells@2+mod-enb-cells-2ca+suite-4g@10,2+" \
"mod-enb-meas-enable -t =handover.py"
"""
and in resources.conf (or scenario), added:
"""
enb:
...
cell_list:
- dl_rfemu:
type: gnuradio_zmq
- dl_rfemu:
type: gnuradio_zmq
"""
Note that since the broker is used, there's not need for mod-srsue-ncarriers@2
since the broker is joining the 2 enb cells into 1 stream on the UE side.
Change-Id: I6282cda400558dcb356276786d91e6388524c5b1
when phy.signal=1 is set in the log_options, the eNB will dump
a binary file that needs to be copied back as well
Change-Id: I63d13cb74572ac065d5a3fcfb1632552d0a6dbc6
It turned out that the Amarisoft and SRS eNB scheduler produces
slightly different maximum data rates for both UL and DL.
Change-Id: I30fa7006906d101c53ba586fb06bced3945aa960
This way we benefit from:
* knowing which attributes are used/required by each object class and
subclass
* Having validation function definitions near the class going to use them
Change-Id: I8fd6773c51d19405a585977af4ed72cad2b21db1
this patch moves the rf_dev_args creation for both eNB types
into the eNB base class, since they are identical.
the patch also fixes the arguments for all CA and MIMO configurations
Change-Id: I8ca3ed83e65dc07927385267e5970bc4f5b120d5
Two implementations are provided:
* Amarisoft Ctrl interface (websocket)
* Mini-Circuits Programmable Attenuator (HW, HTTP API) [1]
in Amarisoft ENBs, if no rfemu is configured explicitly, the Ctrl
interface one is used by default, while still being possible to use the
HW one.
[1] https://www.minicircuits.com/pdfs/RC4DAT-6G-60.pdf
Change-Id: Ie98a3fb9bcd2b87b96ecbb5b79e0f53981892a32
Pau Espin
Andre Puschmann