diff options
| -rw-r--r-- | src/Makefile.am | 6 | ||||
| -rw-r--r-- | src/gprs_coding_scheme.cpp | 104 | ||||
| -rw-r--r-- | src/gprs_coding_scheme.h | 129 |
3 files changed, 237 insertions, 2 deletions
diff --git a/src/Makefile.am b/src/Makefile.am index 12170757..6428bef1 100644 --- a/src/Makefile.am +++ b/src/Makefile.am @@ -56,7 +56,8 @@ libgprs_la_SOURCES = \ llc.cpp \ rlc.cpp \ osmobts_sock.cpp \ - gprs_codel.c + gprs_codel.c \ + gprs_coding_scheme.cpp bin_PROGRAMS = \ osmo-pcu @@ -94,7 +95,8 @@ noinst_HEADERS = \ llc.h \ pcu_utils.h \ cxx_linuxlist.h \ - gprs_codel.h + gprs_codel.h \ + gprs_coding_scheme.h osmo_pcu_SOURCES = pcu_main.cpp diff --git a/src/gprs_coding_scheme.cpp b/src/gprs_coding_scheme.cpp new file mode 100644 index 00000000..3488b320 --- /dev/null +++ b/src/gprs_coding_scheme.cpp @@ -0,0 +1,104 @@ +/* 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; +} diff --git a/src/gprs_coding_scheme.h b/src/gprs_coding_scheme.h new file mode 100644 index 00000000..71b64cf7 --- /dev/null +++ b/src/gprs_coding_scheme.h @@ -0,0 +1,129 @@ +/* gprs_coding_scheme.h + * + * 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. + */ + +#pragma once + +#include <stdint.h> +#include <stddef.h> + + +class GprsCodingScheme { +public: + enum Scheme { + UNKNOWN, + CS1, CS2, CS3, CS4, + MCS1, MCS2, MCS3, MCS4, + MCS5, MCS6, MCS7, MCS8, MCS9, + NUM_SCHEMES + }; + + enum Mode { + GPRS, + EGPRS_GMSK, + EGPRS, + }; + + GprsCodingScheme(Scheme s = UNKNOWN); + + operator bool() const {return m_scheme != UNKNOWN;} + operator int() const {return (int)m_scheme;} + void operator =(Scheme s); + void operator =(GprsCodingScheme o); + bool isValid() const {return UNKNOWN <= m_scheme && m_scheme <= MCS9;} + bool isGprs() const {return CS1 <= m_scheme && m_scheme <= CS4;} + bool isEgprs() const {return m_scheme >= MCS1;} + bool isEgprsGmsk() const {return isEgprs() && m_scheme <= MCS4;} + bool isCompatible(Mode mode) const; + + void inc(Mode mode); + void dec(Mode mode); + + unsigned int sizeUL() const; + unsigned int sizeDL() const; + unsigned int maxBytesUL() const; + unsigned int maxBytesDL() const; + unsigned int spareBitsUL() const; + unsigned int spareBitsDL() const; + const char *name() const; + + static GprsCodingScheme getBySizeUL(unsigned size); + +private: + enum Scheme m_scheme; +}; + +inline bool GprsCodingScheme::isCompatible(Mode mode) const +{ + switch (mode) { + case GPRS: return isGprs(); + case EGPRS_GMSK: return isEgprsGmsk(); + case EGPRS: return isEgprs(); + } + + return false; +} + +inline 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; +} + +inline 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; +} + +inline GprsCodingScheme::GprsCodingScheme(Scheme s) + : m_scheme(s) +{ + if (!isValid()) + m_scheme = UNKNOWN; +} + +inline void GprsCodingScheme::operator =(Scheme s) +{ + m_scheme = s; + + if (!isValid()) + m_scheme = UNKNOWN; +} + +inline void GprsCodingScheme::operator =(GprsCodingScheme o) +{ + m_scheme = o.m_scheme; +} |