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annotate doc/ARFCN-mapping @ 890:76cc910c508e

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document fc-imy2pwt
author Mychaela Falconia <falcon@freecalypso.org>
date Sun, 03 Apr 2022 05:29:17 +0000
parents e1c8c5bcb233
children
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760
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1 Frequency bands and band-pairs
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2 ==============================
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3
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4 TI's TCS211 L1 (meaning Layer1 component of TI's TCS211 reference fw and of all
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5 FreeCalypso firmwares that are based on TCS211) can operate either in a single
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6 frequency band or in a pair of bands (one low band and one high band)
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7 corresponding to a regional standard. TI's G23M protocol stack (specifically
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8 its ALR component) commands L1 to operate in a given "standard" (single band or
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9 pair of bands) by way of MPHC_INIT_L1_REQ primitive, which appears in L1 debug
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10 trace output (seen via rvtdump or rvinterf) as a BAND_R trace. The "standard"
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11 number that appears in this BAND_R trace is one of the following 8
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12 possibilities:
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13
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14 STD 1 (GSM)
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15
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16 This STD tells L1 to operate only in the GSM900 band by itself (not
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17 paired with DCS1800), and furthermore to use the old definition of this
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18 GSM900 band with only 124 channels. TI's code supports this option in
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19 order to support old RF hardware that was made for this old definition
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20 of the GSM900 band, but none of the phones, modems or development boards
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21 we work with in FreeCalypso are this old - thus this STD 1 should never
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22 get activated unless something is misconfigured somewhere.
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23
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24 STD 2 (GSM_E)
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25
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26 This STD tells L1 to operate in the EGSM band, i.e., the new extended
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27 definition of the 900 MHz band with 174 channels total - but it still
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28 specifies only the EGSM band by itself, not paired with DCS1800. We
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29 don't have any FC hardware targets that support the 900 MHz band but
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30 don't support DCS1800, thus this STD can only get selected if the DCS
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31 band is artificially disabled - and we do not currently know of any use
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32 case for disabling DCS while keeping EGSM enabled - thus this STD should
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33 not be seen in practice either.
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34
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35 STD 3 (PCS1900)
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36
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37 This STD tells L1 to operate in the PCS band by itself. This STD
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38 selection occurs in regular operation on devices like the Pirelli DP-L10
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39 and the tri900 version of our FCDEV3B: on such tri900 platforms the G23M
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40 protocol stack switches L1 back and forth between STD 6 (900+1800 MHz
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41 band pair, see below) and STD 3 for PCS. Because tri900 platforms have
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42 no support for the GSM850 band, the PCS1900 band gets selected as a
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43 singleton (not a band pair) when the device operates on the "US" side
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44 of its multi-region frequency band support.
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45
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46 STD 4 (DCS1800)
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47
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48 This STD tells L1 to operate in the DCS band by itself, not paired with
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49 900 MHz GSM or EGSM. Triband devices built in the tri850 configuration
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50 (GTA02-850 and FCDEV3B-850) will select this STD when looking for
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51 possible DCS1800 cells - however, our expected user pattern is such that
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52 a user living or operating in EU-band lands (EGSM and/or DCS bands)
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53 would not be using a tri850 device, much in contrast with the reverse
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54 situation where tri900 devices are commonly used in the PCS1900 band.
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55
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56 STD 5 (DUAL)
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57
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58 This STD selects a band pair consisting of the old 124-channel
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59 definition of the GSM900 band plus the DCS1800 band. Because all hw
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60 platforms targeted by FreeCalypso support the 900 MHz band in its new
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61 EGSM definition if they support it at all, this STD 5 should never get
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62 activated unless something is misconfigured somewhere.
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63
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64 STD 6 (DUALEXT)
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65
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66 This STD selects the classic "EU" band pair of EGSM + DCS1800. This STD
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67 selection will occur in normal operation on EU dual-band devices like
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68 the EU versions of Motorola C1xx and Huawei GTM900-B, as well as tri900
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69 and quadband devices operating on the "EU" side of their multi-region
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70 frequency band support.
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71
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72 STD 7 (GSM850)
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73
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74 This STD tells L1 to operate in the GSM850 band by itself. We don't
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75 have any FC hardware targets that support the 850 MHz band but don't
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76 support PCS1900, thus this STD can only get selected if the PCS band is
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77 artificially disabled.
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78
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79 STD 8 (DUAL_US)
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80
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81 This STD selects the full "US" band pair of GSM850 + PCS1900. This STD
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82 selection will occur in normal operation on US dual-band devices like
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83 the US versions of Motorola C1xx and Huawei GTM900-P, as well as tri850
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84 and quadband (but not tri900!) devices operating on the "US" side of
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85 their multi-region frequency band support. Note that tri900 devices
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86 will go into STD 3 (PCS1900 band by itself) instead!
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87
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88 ARFCN munging
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89 =============
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90
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91 When L1 operates in one of single-band standards 1 (GSM), 3 (PCS1900), 4
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92 (DCS1800) or 7 (GSM850), its internal radio_freq numbers that appear in L1 debug
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93 traces are exactly equal to standard ARFCNs for that band as defined by ETSI.
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94 However, when it operates in STD 2 (EGSM by itself) or in any of the dual-band
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95 standards, it uses its own radio_freq numbers which are different from standard
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96 ARFCNs. Non-standard internal radio_freq numbers are used in these cases
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97 because L1 needs a continuous number range for indexing arrays, and the mappings
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98 are given below. STD 6 (DUALEXT) and STD 2 (GSM_E) use the following mapping:
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99
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100 Band Standard ARFCN TCS211 L1 radio_freq
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101 --------------------------------------------
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102 EGSM 1-124 1-124
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103 EGSM 975-1023 125-173
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104 EGSM 0 174
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105 DCS 512-885 175-548
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106
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107 The internal radio_freq number for the DUALEXT band pair ranges continuously
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108 from 1 to 548. STD 2 (EGSM by itself) uses the same mapping without the DCS
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109 subrange, with radio_freq ranging continously from 1 to 174. DUAL_US band pair
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110 (STD 8) uses a continuous radio_freq range from 1 to 423 as follows:
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111
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112 Band Standard ARFCN TCS211 L1 radio_freq
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113 --------------------------------------------
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114 GSM850 128-251 1-124
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115 PCS 512-810 125-423
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116
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117 Because these internal radio_freq numbers appear in L1 debug traces, power users
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118 who like to understand these traces and see what their phone is doing need to
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119 be able to work with these numbers. I (Mother Mychaela) currently use a Pirelli
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120 DP-L10 running its original proprietary fw as my everyday phone, for lack of
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121 anything better, and because it is a tri900 device, it operates in STD 3 for
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122 PCS1900 band by itself. In this configuration all radio_freq numbers that
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123 appear in the debug trace output are native PCS band ARFCNs without any munging,
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124 thus no conversion tools are needed. However, I am now starting to work more
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125 with quadband Tango modules and development boards (iWOW DSK and FC Caramel2),
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126 and we also have a few FCDEV3B-850 boards; these platforms support both GSM850
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127 and PCS1900 bands and thus go into STD 8 for DUAL_US, and this dual-band STD
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128 involves ARFCN munging as detailed above. Furthermore, anyone who lives or
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129 operates in EU-band lands would normally be operating in dual-band STD 6
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130 (DUALEXT), and that one also involves ARFCN munging.
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131
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132 Because there is a need to translate back and forth between standard ARFCNs and
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133 L1 radio_freq numbers, a pair of utilities has been written for this purpose:
e1c8c5bcb233 ARFCN conversion tools documented
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134 arfcn2ti and ti2arfcn. Their usage and operation is straightforward; each
e1c8c5bcb233 ARFCN conversion tools documented
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135 utility takes two command line arguments: a keyword of "eu" or "us" selecting
e1c8c5bcb233 ARFCN conversion tools documented
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136 the band pair being mapped, and the number to be converted. The output of the
e1c8c5bcb233 ARFCN conversion tools documented
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137 conversion (the other number) is printed on stdout.