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Documentation update and small allignement of build_oai script -w option with documentation

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frtabu
2019-08-21 11:17:37 +02:00
parent 4e68e79894
commit 3d66fbdb7a
3 changed files with 45 additions and 23 deletions
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cmake_targets/build_oai
+1 -1
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@@ -728,7 +728,7 @@ function main() {
echo_info "liboai_transpro.so is linked to ETHERNET transport"
fi
if [ "$RFSIMULATOR" == "true" -o "$HW" == "OAI_SIMU" ] ; then
if [ "$HW" == "OAI_SIMU" ] ; then
echo_info "Compiling rfsimulator"
compilations \
$lte_build_dir rfsimulator \
doc/BUILD.md
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@@ -54,7 +54,7 @@ cd cmake_targets/
```
- The `-I` option is to install pre-requisites, you only need it the first time you build the softmodem or when some oai dependencies have changed.
- The `-w` option is to select the radio head support you want to include in your build. Radio head support is provided via a shared library, which is called the "oai device" The build script creates a soft link from `liboai_device.so` to the true device which will be used at run-time (here the USRP one,`liboai_usrpdevif.so` . USRP is the only hardware tested today in the Continuous Integration process.
- The `-w` option is to select the radio head support you want to include in your build. Radio head support is provided via a shared library, which is called the "oai device" The build script creates a soft link from `liboai_device.so` to the true device which will be used at run-time (here the USRP one,`liboai_usrpdevif.so` . USRP is the only hardware tested today in the Continuous Integration process. The RF simulator[RF simulator](../targets/ARCH/rfsimulator/README.md) is implemented as a specific device replacing RF hardware, it can be build using `-w SIMU` option.
- `--eNB` is to build the `lte-softmodem` executable and all required shared libraries
- `--UE` is to build the `lte-uesoftmodem` executable and all required shared libraries
targets/ARCH/rfsimulator/README.md
+43 -21
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@@ -6,31 +6,52 @@ As much as possible, it works like a RF board, but not in realtime: it can run f
#build
## From build_oai
You can build it the same way, and together with actual RF driver
## From [build_oai](../../../doc/BUILD.md) script
The RF simulator is implemented as an oai device and is always build when you build the oai eNB or the oai UE.
Using the `-w SIMU` option it is possible to just re-build the RF simulator device
Example:
```bash
./build_oai --ue-nas-use-tun --UE --eNB -w SIMU
./build_oai --UE --eNB
Will compile UE
Will compile eNB
CMAKE_CMD=cmake ..
No local radio head and no transport protocol selected
No radio head has been selected (HW set to None)
No transport protocol has been selected (TP set to None)
RF HW set to None
Flags for Deadline scheduler: False
..................
.................
Compiling rfsimulator
Log file for compilation has been written to: /usr/local/oai/rfsimu_config/openairinterface5g/cmake_targets/log/rfsimulator.Rel14.txt
rfsimulator compiled
......................
......................
```
It is also possible to build actual RF and use choose on each run:
```bash
./build_oai --ue-nas-use-tun --UE --eNB -w USRP --rfsimulator
```
Will build both the eNB (lte-softmodem) and the UE (lte-uesoftmodem)
We recommend to use the option --ue-nas-use-tun that is much simpler to use than the OAI kernel driver.
## Add the rfsimulator after initial build
After any regular build, you can compile the driver
After any regular build, you can compile the device, from the build directory
```bash
cd <the_compilation_dir_from_bouild_oai_script>/build
cd <path to oai sources>/openairinterface5g/cmake_targets/lte_build_oai/build
make rfsimulator
```
Then, you can use it freely
this is equivalent to using `-w SIMU` when running the `build_oai` script.
e
# Usage
Setting the env variable RFSIMULATOR enables the RF board simulator
It should the set to "server" in the eNB or gNB
To use the RF simulator you add the `--rfsim` option to the command line. By default the RF simulator device will try to connect to host 127.0.0.1, port 4043, which is usually the behavior for the UE.
The RF simulator is using the configuration module, its parameters are defined in a specific section called "rfsimulator"
| parameter | usage | default |
|:---------------------|:------------------------------------------------------------------------------------------------------------------|----:|
| serveraddr | ip address to connect to, or "enb" to behave as a tcp server | 127.0.0.1 |
| serverport | port number to connect to or to listen on (eNB, which behaved as a tcp server) | 4043 |
| options | list of comma separated run-time options, two are supported: `chanmod` to enable channel modeling and `saviq` to write transmitted iqs to a file | all options disabled |
| modelname | Name of the channel model to apply on received iqs when the `chanmod` option is enabled | AWGN |
| IQfile | Path to the file to be used to store iqs, when the `saviq`option is enabled | /tmp/rfsimulator.iqs |
Setting the env variable RFSIMULATOR can be used instead of using the serveraddr parameter, it is to preserve compatibility with previous version.
## 4G case
For the UE, it should be set to the IP address of the eNB
@@ -38,13 +59,14 @@ example:
```bash
sudo RFSIMULATOR=192.168.2.200 ./lte-uesoftmodem -C 2685000000 -r 50
```
Except this, the UE and the eNB can be used as it the RF is real
Except this, the UE and the eNB can be used as it the RF is real. noS1 mode can also be used with the RF simulator.
If you reach 'RA not active' on UE, be careful to generate a valid SIM
If you reach 'RA not active' on UE, be careful to generate a valid SIM.
```bash
$OPENAIR_DIR/targets/bin/conf2uedata -c $OPENAIR_DIR/openair3/NAS/TOOLS/ue_eurecom_test_sfr.conf -o .
```
## 5G case
5G RF simulator will be aligned with 4G as the effort to merge 5G specifuc branches into develop is making progress.
After regular build, add the simulation driver
(don't use ./build_oai -w SIMU until we merge 4G and 5G branches)
```bash
@@ -66,7 +88,7 @@ In UE, you can add "-d" to get the softscope
You can store emitted I/Q samples:
If you set the environment variable: saveIQfile to a file name
If you set the option `saviq`
The simulator will write all IQ samples into this file
Then, you can replay with the executable "replay_node"
@@ -83,11 +105,11 @@ If you have existing stored I/Q, you can adpat the tool "replay_node" to convert
The format intend to be compatible with the OAI store/replay feature on USRP
### Channel simulation
The RF channel simulator is called.
In current version all channel paramters are hard coded in the call to:
When the `chanmod` option is enabled, The RF channel simulator is called.
In current version all channel paramters are set depending on the model name via a call to:
```
new_channel_desc_scm(bridge->tx_num_channels,bridge->rx_num_channels,
AWGN,
<model name>,
bridge->sample_rate,
bridge->tx_bw,
0.0, // forgetting_factor
@@ -95,7 +117,7 @@ new_channel_desc_scm(bridge->tx_num_channels,bridge->rx_num_channels,
0); // path_loss in dB
```
Only the input noise can be changed on command line with -s parameter.
With path loss = 0 set "-s 5" to see a little noise
With path loss = 0 set "-s 5" to see a little noise. -s is a shortcut to `channelmod.s`. It is expected to enhance the channel modedelization flexibility via the addition of more parameters in the channelmod section.
#Caveacts
Still issues in power control: txgain, rxgain are not used