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-rw-r--r--src/gprs_coding_scheme.cpp104
1 files changed, 104 insertions, 0 deletions
diff --git a/src/gprs_coding_scheme.cpp b/src/gprs_coding_scheme.cpp
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+/* 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 bytes;
+ unsigned ext_bits;
+ } uplink, downlink;
+ const char *name;
+} mcs_info[GprsCodingScheme::NUM_SCHEMES] = {
+ {{0, 0}, {0, 0}, "UNKNOWN"},
+ {{23, 0}, {23, 0}, "CS-1"},
+ {{33, 7}, {33, 7}, "CS-2"},
+ {{39, 3}, {39, 3}, "CS-3"},
+ {{53, 7}, {53, 7}, "CS-4"},
+
+ {{26, 1}, {26, 1}, "MCS-1"},
+ {{32, 1}, {32, 1}, "MCS-2"},
+ {{41, 1}, {41, 1}, "MCS-3"},
+ {{48, 1}, {48, 1}, "MCS-4"},
+
+ {{60, 7}, {59, 6}, "MCS-5"},
+ {{78, 7}, {77, 6}, "MCS-6"},
+ {{118, 2}, {117, 4}, "MCS-7"},
+ {{142, 2}, {141, 4}, "MCS-8"},
+ {{154, 2}, {153, 4}, "MCS-9"},
+};
+
+
+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;
+}
+
+const char *GprsCodingScheme::name() const
+{
+ return mcs_info[m_scheme].name;
+}