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-rwxr-xr-x[-rw-r--r--]python/misc_utils/arfcn.py154
1 files changed, 88 insertions, 66 deletions
diff --git a/python/misc_utils/arfcn.py b/python/misc_utils/arfcn.py
index 86d379d..349e8ce 100644..100755
--- a/python/misc_utils/arfcn.py
+++ b/python/misc_utils/arfcn.py
@@ -2,6 +2,7 @@
# -*- coding: utf-8 -*-
# @file
# @author (C) 2015 by Roman Khassraf <rkhassraf@gmail.com>
+# (C) 2017 by Piotr Krysik <ptrkrysik@gmail.com>
# @section LICENSE
#
# Gr-gsm is free software; you can redistribute it and/or modify
@@ -23,32 +24,66 @@
import collections
+__chan_spacing = 2e5
+__arfcn_pcs = 0x8000
+
# first uplink freq, distance between uplink/downlink frequency, list of range tuple
# each tuple in a range tuple contains: first arfcn of the range, last arfcn of the range, offset of the range
# entries are ordered by relevance
__band_conf = collections.OrderedDict([
- ('P-GSM', {'f_start': 890.0e6, 'distance': 45e6, 'ranges': [(1, 124, 0)]}),
- ('DCS1800', {'f_start': 1710.2e6, 'distance': 95e6, 'ranges': [(512, 885, 512)]}),
- ('PCS1900', {'f_start': 1850.2e6, 'distance': 80e6, 'ranges': [(512, 810, 512)]}),
- ('E-GSM', {'f_start': 890.0e6, 'distance': 45e6, 'ranges': [(0, 124, 0), (975, 1023, 1024)]}),
- ('R-GSM', {'f_start': 890.0e6, 'distance': 45e6, 'ranges': [(0, 124, 0), (955, 1023, 1024)]}),
- ('GSM450', {'f_start': 450.6e6, 'distance': 10e6, 'ranges': [(259, 293, 259)]}),
- ('GSM480', {'f_start': 479e6, 'distance': 10e6, 'ranges': [(306, 340, 306)]}),
- ('GSM850', {'f_start': 824.2e6, 'distance': 45e6, 'ranges': [(128, 251, 128)]}),
+ ('GSM900', {'f_start': 880.2e6, 'distance': 45e6, 'ranges': [(975, 1023), (0, 124)]}),
+ ('DCS1800', {'f_start': 1710.2e6, 'distance': 95e6, 'ranges': [(512, 885)]}),
+ ('GSM850', {'f_start': 824.2e6, 'distance': 45e6, 'ranges': [(128, 251)]}),
+ ('PCS1900', {'f_start': 1850.2e6, 'distance': 80e6, 'ranges': [(512+__arfcn_pcs, 810+__arfcn_pcs)]}), #PCS band is "special" as its channel number range overlap with DCS1800
+ ('GSM450', {'f_start': 450.6e6, 'distance': 10e6, 'ranges': [(259, 293)]}),
+ ('GSM480', {'f_start': 479e6, 'distance': 10e6, 'ranges': [(306, 340)]}),
+ ('GSM-R', {'f_start': 876.2e6, 'distance': 45e6, 'ranges': [(955, 1023), (0, 124)]}),
])
-__chan_spacing = 2e5
-
def get_bands():
return __band_conf.keys()
-
-def is_valid_arfcn(arfcn, band):
+def arfcn2band(arfcn):
+ for band_name,band_desc in __band_conf.items():
+ for arfcns_range in band_desc["ranges"]:
+ arfcn_start = arfcns_range[0]
+ arfcn_stop = arfcns_range[1]
+ if arfcn_start <= arfcn <= arfcn_stop:
+ return band_name
+ return None
+
+def freq2band(freq, downlink=False):
+ for band_name,band_desc in __band_conf.items():
+ chans_total = 0
+ #count total number of channels in the range
+ for arfcns_range in band_desc["ranges"]:
+ arfcn_start = arfcns_range[0]
+ arfcn_stop = arfcns_range[1]
+ chans_in_range = arfcn_stop - arfcn_start + 1
+ chans_total = chans_total + chans_in_range
+
+ first_freq = band_desc["f_start"]
+ if downlink:
+ first_freq = first_freq + band_desc["distance"]
+ last_freq = first_freq + (chans_total - 1) * __chan_spacing
+
+ if first_freq <= freq <= last_freq:
+ return band_name
+ return None
+
+def uplink2band(freq):
+ return freq2band(freq, False)
+
+def downlink2band(freq):
+ return freq2band(freq, True)
+
+def is_valid_arfcn(arfcn):
"""
Returns True if arfcn is valid in the given band, else False
"""
- if band in __band_conf:
+ band = arfcn2band(arfcn)
+ if band is not None:
conf = __band_conf.get(band)
for arfcn_range in conf['ranges']:
arfcn_start = arfcn_range[0]
@@ -58,92 +93,78 @@ def is_valid_arfcn(arfcn, band):
return False
-def is_valid_uplink(freq, band):
+def is_valid_uplink(freq):
"""
Returns True if the given frequency is a valid uplink frequency in the given band
"""
- result = None
- if band in __band_conf:
- conf = __band_conf.get(band)
- result = False
- for arfcn_range in conf['ranges']:
- arfcn_start = arfcn_range[0]
- arfcn_end = arfcn_range[1]
- first_freq = arfcn2uplink(arfcn_start, band)
- last_freq = arfcn2uplink(arfcn_end, band)
- if first_freq is None or last_freq is None:
- result = False
- elif first_freq <= freq <= last_freq:
- result = True
+ result = False
+ band = uplink2band(freq)
+ if band is not None:
+ result = True
+
return result
-
-def is_valid_downlink(freq, band):
+def is_valid_downlink(freq):
"""
Returns True if the given frequency is a valid downlink frequency in the given band
"""
- result = None
- if band in __band_conf:
- conf = __band_conf.get(band)
- result = False
- for arfcn_range in conf['ranges']:
- arfcn_start = arfcn_range[0]
- arfcn_end = arfcn_range[1]
- first_freq = arfcn2downlink(arfcn_start, band)
- last_freq = arfcn2downlink(arfcn_end, band)
- if first_freq is None or last_freq is None:
- result = False
- elif first_freq <= freq <= last_freq:
- result = True
+ result = False
+ band = downlink2band(freq)
+ if band is not None:
+ result = True
+
return result
-
-def arfcn2uplink(arfcn, band):
- if band in __band_conf and is_valid_arfcn(arfcn, band):
+def arfcn2uplink(arfcn):
+ band = arfcn2band(arfcn)
+ if band is not None:
conf = __band_conf.get(band)
f_start = conf['f_start']
- offset = None
+ arfcns_total = 0
for arfcn_range in conf['ranges']:
arfcn_start = arfcn_range[0]
arfcn_end = arfcn_range[1]
- if arfcn_start <= arfcn <= arfcn_end:
- offset = arfcn_range[2]
- if offset is not None:
- f = f_start + (__chan_spacing * (arfcn - offset))
- return round(f, 1)
+ if arfcn_start <= arfcn <= arfcn_end:
+ f = f_start + (__chan_spacing * (arfcn - arfcn_start + arfcns_total))
+ return round(f, 1)
+ arfcns_total = arfcn_end - arfcn_start + 1
return -1
-def arfcn2downlink(arfcn, band):
- if band in __band_conf and is_valid_arfcn(arfcn, band):
+def arfcn2downlink(arfcn):
+ band = arfcn2band(arfcn)
+ if band is not None:
conf = __band_conf.get(band)
distance = conf['distance']
- return round(arfcn2uplink(arfcn, band) + distance, 1)
+ return round(arfcn2uplink(arfcn) + distance, 1)
return -1
-
-def uplink2arfcn(freq, band):
- if band in __band_conf and is_valid_uplink(freq, band):
+def uplink2arfcn(freq):
+ band = uplink2band(freq)
+ if band is not None:
conf = __band_conf.get(band)
- f_start = conf['f_start']
- offset = None
+ arfcns_total = 0
for arfcn_range in conf['ranges']:
arfcn_start = arfcn_range[0]
arfcn_end = arfcn_range[1]
- offset = arfcn_range[2]
- arfcn = int(round(offset + ((freq - f_start) / __chan_spacing), 0))
- if arfcn_start <= arfcn <= arfcn_end:
+ arfcns_in_range = arfcn_end - arfcn_start + 1
+
+ freq_start = conf['f_start'] + arfcns_total * __chan_spacing
+ freq_end = freq_start + (arfcns_in_range - 1) * __chan_spacing
+ if freq_start <= freq <= freq_end:
+ arfcn = int(round(arfcn_start + ((freq - freq_start) / __chan_spacing), 0))
return arfcn
+ arfcns_total = arfcns_total + arfcns_in_range
return -1
-
-def downlink2arfcn(freq, band):
- if band in __band_conf and is_valid_downlink(freq, band):
+def downlink2arfcn(freq):
+ band = downlink2band(freq)
+ if band is not None:
conf = __band_conf.get(band)
distance = conf['distance']
freq_uplink = freq - distance
- return int(round(uplink2arfcn(freq_uplink, band), 0))
+ return int(round(uplink2arfcn(freq_uplink), 0))
return -1
@@ -158,3 +179,4 @@ def get_arfcn_ranges(band):
arfcn_tuple = (arfcn_range[0], arfcn_range[1])
result.append(arfcn_tuple)
return result
+