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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"
#define MAX_NUM_ARQ 2 /* max. number of ARQ */
#define MAX_NUM_MCS 9 /* max. number of MCS */
/*
* 44.060 Table 8.1.1.1 and Table 8.1.1.2
* It has 3 level indexing. 0th level is ARQ type
* 1st level is Original MCS( index 0 corresponds to MCS1 and so on)
* 2nd level is MS MCS (index 0 corresponds to MCS1 and so on)
*/
static enum CodingScheme egprs_mcs_retx_tbl[MAX_NUM_ARQ]
[MAX_NUM_MCS][MAX_NUM_MCS] = {
{
{MCS1, MCS1, MCS1, MCS1, MCS1, MCS1, MCS1, MCS1, MCS1},
{MCS2, MCS2, MCS2, MCS2, MCS2, MCS2, MCS2, MCS2, MCS2},
{MCS3, MCS3, MCS3, MCS3, MCS3, MCS3, MCS3, MCS3, MCS3},
{MCS1, MCS1, MCS1, MCS4, MCS4, MCS4, MCS4, MCS4, MCS4},
{MCS2, MCS2, MCS2, MCS2, MCS5, MCS5, MCS7, MCS7, MCS7},
{MCS3, MCS3, MCS3, MCS3, MCS3, MCS6, MCS6, MCS6, MCS9},
{MCS2, MCS2, MCS2, MCS2, MCS5, MCS5, MCS7, MCS7, MCS7},
{MCS3, MCS3, MCS3, MCS3, MCS3, MCS6, MCS6, MCS8, MCS8},
{MCS3, MCS3, MCS3, MCS3, MCS3, MCS6, MCS6, MCS6, MCS9}
},
{
{MCS1, MCS1, MCS1, MCS1, MCS1, MCS1, MCS1, MCS1, MCS1},
{MCS2, MCS2, MCS2, MCS2, MCS2, MCS2, MCS2, MCS2, MCS2},
{MCS3, MCS3, MCS3, MCS3, MCS3, MCS3, MCS3, MCS3, MCS3},
{MCS4, MCS4, MCS4, MCS4, MCS4, MCS4, MCS4, MCS4, MCS4},
{MCS5, MCS5, MCS5, MCS5, MCS5, MCS5, MCS7, MCS7, MCS7},
{MCS6, MCS6, MCS6, MCS6, MCS6, MCS6, MCS6, MCS6, MCS9},
{MCS5, MCS5, MCS5, MCS5, MCS5, MCS5, MCS7, MCS7, MCS7},
{MCS6, MCS6, MCS6, MCS6, MCS6, MCS6, MCS6, MCS8, MCS8},
{MCS6, MCS6, MCS6, MCS6, MCS6, MCS6, MCS6, MCS6, MCS9}
}
};
enum Family {
FAMILY_INVALID,
FAMILY_A,
FAMILY_B,
FAMILY_C,
};
CodingScheme GprsCodingScheme::get_retx_mcs(const GprsCodingScheme mcs,
const GprsCodingScheme demanded_mcs,
const unsigned arq_type)
{
return egprs_mcs_retx_tbl[arq_type][mcs_chan_code(mcs)][mcs_chan_code(demanded_mcs)];
}
static struct {
struct {
uint8_t bytes;
uint8_t ext_bits;
uint8_t data_header_bits;
} uplink, downlink;
uint8_t data_bytes;
uint8_t optional_padding_bits;
enum HeaderType data_hdr;
enum Family family;
} mcs_info[NUM_SCHEMES] = {
{{0, 0}, {0, 0}, 0, 0,
HEADER_INVALID, FAMILY_INVALID},
{{23, 0}, {23, 0}, 20, 0,
HEADER_GPRS_DATA, FAMILY_INVALID},
{{33, 7}, {33, 7}, 30, 0,
HEADER_GPRS_DATA, FAMILY_INVALID},
{{39, 3}, {39, 3}, 36, 0,
HEADER_GPRS_DATA, FAMILY_INVALID},
{{53, 7}, {53, 7}, 50, 0,
HEADER_GPRS_DATA, FAMILY_INVALID},
{{26, 1}, {26, 1}, 22, 0,
HEADER_EGPRS_DATA_TYPE_3, FAMILY_C},
{{32, 1}, {32, 1}, 28, 0,
HEADER_EGPRS_DATA_TYPE_3, FAMILY_B},
{{41, 1}, {41, 1}, 37, 48,
HEADER_EGPRS_DATA_TYPE_3, FAMILY_A},
{{48, 1}, {48, 1}, 44, 0,
HEADER_EGPRS_DATA_TYPE_3, FAMILY_C},
{{60, 7}, {59, 6}, 56, 0,
HEADER_EGPRS_DATA_TYPE_2, FAMILY_B},
{{78, 7}, {77, 6}, 74, 48,
HEADER_EGPRS_DATA_TYPE_2, FAMILY_A},
{{118, 2}, {117, 4}, 56, 0,
HEADER_EGPRS_DATA_TYPE_1, FAMILY_B},
{{142, 2}, {141, 4}, 68, 0,
HEADER_EGPRS_DATA_TYPE_1, FAMILY_A},
{{154, 2}, {153, 4}, 74, 0,
HEADER_EGPRS_DATA_TYPE_1, FAMILY_A},
};
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);
}
uint8_t GprsCodingScheme::sizeUL() const
{
return mcs_info[m_scheme].uplink.bytes + (spareBitsUL() ? 1 : 0);
}
uint8_t GprsCodingScheme::usedSizeUL() const
{
if (mcs_info[m_scheme].data_hdr == HEADER_GPRS_DATA)
return mcs_info[m_scheme].uplink.bytes;
else
return sizeUL();
}
uint8_t GprsCodingScheme::maxBytesUL() const
{
return mcs_info[m_scheme].uplink.bytes;
}
uint8_t GprsCodingScheme::spareBitsUL() const
{
return mcs_info[m_scheme].uplink.ext_bits;
}
uint8_t GprsCodingScheme::sizeDL() const
{
return mcs_info[m_scheme].downlink.bytes + (spareBitsDL() ? 1 : 0);
}
uint8_t GprsCodingScheme::usedSizeDL() const
{
if (mcs_info[m_scheme].data_hdr == HEADER_GPRS_DATA)
return mcs_info[m_scheme].downlink.bytes;
else
return sizeDL();
}
uint8_t GprsCodingScheme::maxBytesDL() const
{
return mcs_info[m_scheme].downlink.bytes;
}
uint8_t GprsCodingScheme::spareBitsDL() const
{
return mcs_info[m_scheme].downlink.ext_bits;
}
uint8_t GprsCodingScheme::maxDataBlockBytes() const
{
return mcs_info[m_scheme].data_bytes;
}
uint8_t GprsCodingScheme::optionalPaddingBits() const
{
return mcs_info[m_scheme].optional_padding_bits;
}
enum HeaderType GprsCodingScheme::headerTypeData() const
{
return mcs_info[m_scheme].data_hdr;
}
void GprsCodingScheme::inc(enum mcs_kind mode)
{
if (!isCompatible(mode))
/* This should not happen. TODO: Use assert? */
return;
CodingScheme new_cs(CodingScheme(m_scheme + 1));
if (!GprsCodingScheme(new_cs).isCompatible(mode))
/* Clipping, do not change the value */
return;
m_scheme = new_cs;
}
void GprsCodingScheme::dec(enum mcs_kind mode)
{
if (!isCompatible(mode))
/* This should not happen. TODO: Use assert? */
return;
CodingScheme new_cs(CodingScheme(m_scheme - 1));
if (!GprsCodingScheme(new_cs).isCompatible(mode))
/* Clipping, do not change the value */
return;
m_scheme = new_cs;
}
void GprsCodingScheme::inc()
{
if (mcs_is_gprs(m_scheme) && m_scheme == CS4)
return;
if (mcs_is_edge(m_scheme) && m_scheme == MCS9)
return;
if (!isValid())
return;
m_scheme = CodingScheme(m_scheme + 1);
}
void GprsCodingScheme::dec()
{
if (mcs_is_gprs(m_scheme) && m_scheme == CS1)
return;
if (mcs_is_edge(m_scheme) && m_scheme == MCS1)
return;
if (!isValid())
return;
m_scheme = CodingScheme(m_scheme - 1);
}
bool GprsCodingScheme::isFamilyCompatible(GprsCodingScheme o) const
{
if (*this == o)
return true;
if (mcs_info[m_scheme].family == FAMILY_INVALID)
return false;
return mcs_info[m_scheme].family == mcs_info[o.m_scheme].family;
}
void GprsCodingScheme::decToSingleBlock(bool *needStuffing)
{
switch (m_scheme) {
case MCS7: *needStuffing = false; m_scheme = MCS5; break;
case MCS8: *needStuffing = true; m_scheme = MCS6; break;
case MCS9: *needStuffing = false; m_scheme = MCS6; break;
default: *needStuffing = false; break;
}
}
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