OsmocomBB MS-side GSM Protocol stack (L1, L2, L3) including firmware https://osmocom.org/projects/baseband
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# -*- coding: utf-8 -*-
# TRX Toolkit
# Power measurement emulation
# (C) 2017-2018 by Vadim Yanitskiy <axilirator@gmail.com>
# All Rights Reserved
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# GNU General Public License for more details.
from random import randint
class FakePM:
""" Power measurement emulation for fake transceivers.
There is no such thing like RF signal level in fake Um-interface,
so we need to emulate this. The main idea is to have a list of
all running and idle transceivers. As soon as a measurement
request is received, FakePM will attempt to find a running
transceiver on a given frequency.
The result of such "measurement" is a random RSSI value
in one of the following ranges:
- trx_min ... trx_max - if at least one TRX was found,
- noise_min ... noise_max - no TRX instances were found.
FIXME: it would be great to average the rate of bursts
and indicated power / attenuation values for all
matching transceivers, so "pure traffic" ARFCNs
would be handled properly.
def __init__(self, noise_min, noise_max, trx_min, trx_max):
# Init list of transceivers
self.trx_list = []
# RSSI randomization ranges
self.noise_min = noise_min
self.noise_max = noise_max
self.trx_min = trx_min
self.trx_max = trx_max
def rssi_noise(self):
return randint(self.noise_min, self.noise_max)
def rssi_trx(self):
return randint(self.trx_min, self.trx_max)
def measure(self, freq, fn = None):
# Iterate over all known transceivers
for trx in self.trx_list:
if not trx.running:
# FIXME: we need to know current TDMA frame number here,
# because some transceivers may use frequency hopping
if trx.fh is not None and fn is None:
# Match by given frequency
if trx.get_tx_freq(fn) == freq:
return self.rssi_trx
return self.rssi_noise