cs: Add GprsCodingScheme::optionalPaddingBits
Return the amount of optional padding bits, which is 6*8 for MCS-3 and MCS-6 and 0 for all other coding schemes. The padding is needed the encode 68 byte data blocks (MCS-8) with these schemes. See TS 44.060, 9.3.2.1 and Annex J for details. Sponsored-by: On-Waves ehf
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@ -28,39 +28,40 @@ static struct {
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unsigned int data_header_bits;
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} uplink, downlink;
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unsigned int data_bytes;
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unsigned int optional_padding_bits;
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const char *name;
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GprsCodingScheme::HeaderType data_hdr;
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GprsCodingScheme::Family family;
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} mcs_info[GprsCodingScheme::NUM_SCHEMES] = {
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{{0, 0}, {0, 0}, 0, "UNKNOWN",
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{{0, 0}, {0, 0}, 0, 0, "UNKNOWN",
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GprsCodingScheme::HEADER_INVALID, GprsCodingScheme::FAMILY_INVALID},
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{{23, 0}, {23, 0}, 20, "CS-1",
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{{23, 0}, {23, 0}, 20, 0, "CS-1",
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GprsCodingScheme::HEADER_GPRS_DATA, GprsCodingScheme::FAMILY_INVALID},
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{{33, 7}, {33, 7}, 30, "CS-2",
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{{33, 7}, {33, 7}, 30, 0, "CS-2",
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GprsCodingScheme::HEADER_GPRS_DATA, GprsCodingScheme::FAMILY_INVALID},
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{{39, 3}, {39, 3}, 36, "CS-3",
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{{39, 3}, {39, 3}, 36, 0, "CS-3",
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GprsCodingScheme::HEADER_GPRS_DATA, GprsCodingScheme::FAMILY_INVALID},
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{{53, 7}, {53, 7}, 50, "CS-4",
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{{53, 7}, {53, 7}, 50, 0, "CS-4",
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GprsCodingScheme::HEADER_GPRS_DATA, GprsCodingScheme::FAMILY_INVALID},
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{{26, 1}, {26, 1}, 22, "MCS-1",
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{{26, 1}, {26, 1}, 22, 0, "MCS-1",
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GprsCodingScheme::HEADER_EGPRS_DATA_TYPE_3, GprsCodingScheme::FAMILY_C},
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{{32, 1}, {32, 1}, 28, "MCS-2",
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{{32, 1}, {32, 1}, 28, 0, "MCS-2",
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GprsCodingScheme::HEADER_EGPRS_DATA_TYPE_3, GprsCodingScheme::FAMILY_B},
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{{41, 1}, {41, 1}, 37, "MCS-3",
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{{41, 1}, {41, 1}, 37, 48, "MCS-3",
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GprsCodingScheme::HEADER_EGPRS_DATA_TYPE_3, GprsCodingScheme::FAMILY_A},
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{{48, 1}, {48, 1}, 44, "MCS-4",
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{{48, 1}, {48, 1}, 44, 0, "MCS-4",
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GprsCodingScheme::HEADER_EGPRS_DATA_TYPE_3, GprsCodingScheme::FAMILY_C},
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{{60, 7}, {59, 6}, 56, "MCS-5",
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{{60, 7}, {59, 6}, 56, 0, "MCS-5",
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GprsCodingScheme::HEADER_EGPRS_DATA_TYPE_2, GprsCodingScheme::FAMILY_B},
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{{78, 7}, {77, 6}, 74, "MCS-6",
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{{78, 7}, {77, 6}, 74, 48, "MCS-6",
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GprsCodingScheme::HEADER_EGPRS_DATA_TYPE_2, GprsCodingScheme::FAMILY_A},
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{{118, 2}, {117, 4}, 56, "MCS-7",
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{{118, 2}, {117, 4}, 56, 0, "MCS-7",
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GprsCodingScheme::HEADER_EGPRS_DATA_TYPE_1, GprsCodingScheme::FAMILY_B},
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{{142, 2}, {141, 4}, 68, "MCS-8",
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{{142, 2}, {141, 4}, 68, 0, "MCS-8",
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GprsCodingScheme::HEADER_EGPRS_DATA_TYPE_1, GprsCodingScheme::FAMILY_A},
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{{154, 2}, {153, 4}, 74, "MCS-9",
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{{154, 2}, {153, 4}, 74, 0, "MCS-9",
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GprsCodingScheme::HEADER_EGPRS_DATA_TYPE_1, GprsCodingScheme::FAMILY_A},
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};
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@ -152,6 +153,11 @@ unsigned int GprsCodingScheme::maxDataBlockBytes() const
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return mcs_info[m_scheme].data_bytes;
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}
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unsigned int GprsCodingScheme::optionalPaddingBits() const
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{
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return mcs_info[m_scheme].optional_padding_bits;
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}
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unsigned int GprsCodingScheme::numDataBlocks() const
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{
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return hdr_type_info[headerTypeData()].num_blocks;
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@ -94,6 +94,7 @@ public:
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unsigned int numDataHeaderBitsUL() const;
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unsigned int numDataHeaderBitsDL() const;
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unsigned int numDataBlockHeaderBits() const;
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unsigned int optionalPaddingBits() const;
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const char *name() const;
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HeaderType headerTypeData() const;
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HeaderType headerTypeControl() const;
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@ -92,7 +92,8 @@ static void check_coding_scheme(GprsCodingScheme& cs, GprsCodingScheme::Mode mod
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OSMO_ASSERT(cs.isFamilyCompatible(new_cs));
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OSMO_ASSERT(cs.isCompatible(new_cs));
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if (need_padding) {
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OSMO_ASSERT(new_cs.maxDataBlockBytes() > cs.maxDataBlockBytes());
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OSMO_ASSERT(new_cs.maxDataBlockBytes() ==
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new_cs.optionalPaddingBits()/8 + cs.maxDataBlockBytes());
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} else {
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OSMO_ASSERT(new_cs.maxDataBlockBytes() == cs.maxDataBlockBytes());
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}
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