1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
|
/* gprs_coding_scheme.cpp
*
* Copyright (C) 2015 by Sysmocom s.f.m.c. GmbH
* Author: Jacob Erlbeck <jerlbeck@sysmocom.de>
*
* 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
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include "gprs_coding_scheme.h"
static struct {
struct {
unsigned int bytes;
unsigned int ext_bits;
} uplink, downlink;
unsigned int data_bytes;
unsigned int num_blocks;
const char *name;
GprsCodingScheme::HeaderType data_hdr;
} mcs_info[GprsCodingScheme::NUM_SCHEMES] = {
{{0, 0}, {0, 0}, 0, 0, "UNKNOWN", GprsCodingScheme::HEADER_INVALID},
{{23, 0}, {23, 0}, 20, 1, "CS-1", GprsCodingScheme::HEADER_GPRS_DATA},
{{33, 7}, {33, 7}, 30, 1, "CS-2", GprsCodingScheme::HEADER_GPRS_DATA},
{{39, 3}, {39, 3}, 36, 1, "CS-3", GprsCodingScheme::HEADER_GPRS_DATA},
{{53, 7}, {53, 7}, 50, 1, "CS-4", GprsCodingScheme::HEADER_GPRS_DATA},
{{26, 1}, {26, 1}, 22, 1, "MCS-1", GprsCodingScheme::HEADER_EGPRS_DATA_TYPE_3},
{{32, 1}, {32, 1}, 28, 1, "MCS-2", GprsCodingScheme::HEADER_EGPRS_DATA_TYPE_3},
{{41, 1}, {41, 1}, 37, 1, "MCS-3", GprsCodingScheme::HEADER_EGPRS_DATA_TYPE_3},
{{48, 1}, {48, 1}, 44, 1, "MCS-4", GprsCodingScheme::HEADER_EGPRS_DATA_TYPE_3},
{{60, 7}, {59, 6}, 56, 1, "MCS-5", GprsCodingScheme::HEADER_EGPRS_DATA_TYPE_2},
{{78, 7}, {77, 6}, 74, 1, "MCS-6", GprsCodingScheme::HEADER_EGPRS_DATA_TYPE_2},
{{118, 2}, {117, 4}, 56, 2, "MCS-7", GprsCodingScheme::HEADER_EGPRS_DATA_TYPE_1},
{{142, 2}, {141, 4}, 68, 2, "MCS-8", GprsCodingScheme::HEADER_EGPRS_DATA_TYPE_1},
{{154, 2}, {153, 4}, 74, 2, "MCS-9", GprsCodingScheme::HEADER_EGPRS_DATA_TYPE_1},
};
GprsCodingScheme GprsCodingScheme::getBySizeUL(unsigned size)
{
switch (size) {
case 23: return GprsCodingScheme(CS1);
case 27: return GprsCodingScheme(MCS1);
case 33: return GprsCodingScheme(MCS2);
case 34: return GprsCodingScheme(CS2);
case 40: return GprsCodingScheme(CS3);
case 42: return GprsCodingScheme(MCS3);
case 49: return GprsCodingScheme(MCS4);
case 54: return GprsCodingScheme(CS4);
case 61: return GprsCodingScheme(MCS5);
case 79: return GprsCodingScheme(MCS6);
case 119: return GprsCodingScheme(MCS7);
case 143: return GprsCodingScheme(MCS8);
case 155: return GprsCodingScheme(MCS9);
}
return GprsCodingScheme(UNKNOWN);
}
unsigned int GprsCodingScheme::sizeUL() const
{
return maxBytesUL() + (spareBitsUL() ? 1 : 0);
}
unsigned int GprsCodingScheme::maxBytesUL() const
{
return mcs_info[m_scheme].uplink.bytes;
}
unsigned int GprsCodingScheme::spareBitsUL() const
{
return mcs_info[m_scheme].uplink.ext_bits;
}
unsigned int GprsCodingScheme::sizeDL() const
{
return maxBytesDL() + (spareBitsDL() ? 1 : 0);
}
unsigned int GprsCodingScheme::maxBytesDL() const
{
return mcs_info[m_scheme].downlink.bytes;
}
unsigned int GprsCodingScheme::spareBitsDL() const
{
return mcs_info[m_scheme].downlink.ext_bits;
}
unsigned int GprsCodingScheme::maxDataBlockBytes() const
{
return mcs_info[m_scheme].data_bytes;
}
unsigned int GprsCodingScheme::numDataBlocks() const
{
return mcs_info[m_scheme].num_blocks;
}
const char *GprsCodingScheme::name() const
{
return mcs_info[m_scheme].name;
}
GprsCodingScheme::HeaderType GprsCodingScheme::headerTypeData() const
{
return mcs_info[m_scheme].data_hdr;
}
void GprsCodingScheme::inc(Mode mode)
{
if (!isCompatible(mode))
/* This should not happen. TODO: Use assert? */
return;
Scheme new_cs(Scheme(m_scheme + 1));
if (!GprsCodingScheme(new_cs).isCompatible(mode))
/* Clipping, do not change the value */
return;
m_scheme = new_cs;
}
void GprsCodingScheme::dec(Mode mode)
{
if (!isCompatible(mode))
/* This should not happen. TODO: Use assert? */
return;
Scheme new_cs(Scheme(m_scheme - 1));
if (!GprsCodingScheme(new_cs).isCompatible(mode))
/* Clipping, do not change the value */
return;
m_scheme = new_cs;
}
void GprsCodingScheme::inc()
{
if (isGprs() && m_scheme == CS4)
return;
if (isEgprs() && m_scheme == MCS9)
return;
if (!isValid())
return;
m_scheme = Scheme(m_scheme + 1);
}
void GprsCodingScheme::dec()
{
if (isGprs() && m_scheme == CS1)
return;
if (isEgprs() && m_scheme == MCS1)
return;
if (!isValid())
return;
m_scheme = Scheme(m_scheme - 1);
}
const char *GprsCodingScheme::modeName(Mode mode)
{
switch (mode) {
case GPRS: return "GPRS";
case EGPRS_GMSK: return "EGPRS_GMSK-only";
case EGPRS: return "EGPRS";
default: return "???";
}
}
|
