tests/coding: Test decoding of DL EGPRS data packet

Change-Id: Ide23a484b980995f24092d1cfbf062aed58fdf61
This commit is contained in:
Pau Espin 2020-04-07 16:30:57 +02:00 committed by laforge
parent e616cbad62
commit ce28d2ebba
2 changed files with 106 additions and 28 deletions

View File

@ -316,7 +316,76 @@ static void test_hr(uint8_t *speech, int len)
printf("\n");
}
static void test_pdtch(uint8_t *l2, int len)
struct test_macblock {
bool is_egprs;
uint16_t exp_burst_bits;
uint16_t l2_len;
uint8_t l2[54];
};
static struct test_macblock test_macblock[] = {
/* Random frame */
{ false,
GSM0503_GPRS_BURSTS_NBITS,
54,
{ 0xa3, 0xaf, 0x5f, 0xc6, 0x36, 0x43, 0x44, 0xab,
0xd9, 0x6d, 0x7d, 0x62, 0x24, 0xc9, 0xd2, 0x92,
0xfa, 0x27, 0x5d, 0x71, 0x7a, 0x59, 0xa8, 0x42,
0xa3, 0xaf, 0x5f, 0xc6, 0x36, 0x43, 0x44, 0xab,
0xa3, 0xaf, 0x5f, 0xc6, 0x36, 0x43, 0x44, 0xab,
0xd9, 0x6d, 0x7d, 0x62, 0x24, 0xc9, 0xd2, 0x92,
0xfa, 0x27, 0x5d, 0x71, 0x7a, 0xa8 }
},
/* jolly frame */
{ false,
GSM0503_GPRS_BURSTS_NBITS,
23,
{ 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08,
0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10,
0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17 }
},
/*
GSM RLC/MAC: EGPRS DL HEADER
0... .... .... 0000 = DL TFI: 0
0... .... crumb 1 of DL TFI (decoded above)
.00. .... = RRBP: Reserved Block: (N+13) mod 2715648 (0)
...0 0... = ES/P: RRBP field is not valid (no Polling) (0)
.... .111 = USF: 7
01.. .... 0000 0000 .... ...0 = BSN: 1
01.. .... crumb 2 of BSN (decoded above)
..00 .... = PR: 0 dB (included) to 3 dB (excluded) less than BCCH level - P0 (0)
.... 0000 crumb 0 of DL TFI (decoded above)
0000 0000 crumb 1 of BSN (decoded above)
.00. .... = SPB (DL): No retransmission (0)
...1 011. = CPS: MCS-1/P1 (0x0b)
.... ...0 crumb 0 of BSN (decoded above)
GSM RLC/MAC: EGPRS DL DATA BLOCK 1 (BSN 1)
.... ..0. = FBI: Current Block is not last RLC data block in TBF
.... ...0 = Extension: Extension octet follows immediately
0000 100. = Length Indicator: 4
.... ...0 = Extension: Extension octet follows immediately
0010 000. = Length Indicator: 16
.... ...1 = Extension: No extension octet follows
data segment: LI[0]=4 indicates: (Last segment of) LLC frame (4 octets)
Data (4 bytes)
Data: 012b2b2b
[Length: 4]
data segment: LI[1]=16 indicates: (Last segment of) LLC frame (16 octets)
Data (16 bytes)
Data: 43c0012b2b2b2b2b2b2b2b2b2b2b2b2b
[Length: 16]
*/
{ true,
GSM0503_GPRS_BURSTS_NBITS,
27,
{ 0x07, 0x40, 0x00, 0x16, 0x10, 0x42, 0x02, 0x56,
0x56, 0x56, 0x86, 0x80, 0x03, 0x56, 0x56, 0x56,
0x56, 0x56, 0x56, 0x56, 0x56, 0x56, 0x56, 0x56,
0x56, 0x56, 0x00 }
},
};
static void test_pdtch(struct test_macblock *tmb, int len)
{
uint8_t result[len];
ubit_t bursts_u[116 * 4];
@ -328,19 +397,22 @@ static void test_pdtch(uint8_t *l2, int len)
switch (len) {
case 34:
case 54:
l2[len - 1] &= 0x7f;
tmb->l2[len - 1] &= 0x7f;
result[len - 1] &= 0x7f;
break;
case 40:
l2[len - 1] &= 0x07;
tmb->l2[len - 1] &= 0x07;
result[len - 1] &= 0x07;
break;
}
/* Encode L2 message */
printf("Encoding: %s\n", osmo_hexdump(l2, len));
rc = gsm0503_pdtch_encode(bursts_u, l2, len);
CHECK_RC_OR_RET(rc == GSM0503_GPRS_BURSTS_NBITS, "encoding");
printf("Encoding: %s\n", osmo_hexdump(tmb->l2, len));
if (tmb->is_egprs)
rc = gsm0503_pdtch_egprs_encode(bursts_u, tmb->l2, len);
else
rc = gsm0503_pdtch_encode(bursts_u, tmb->l2, len);
CHECK_RC_OR_RET(rc == (int)tmb->exp_burst_bits, "encoding");
/* Prepare soft-bits */
osmo_ubit2sbit(bursts_s, bursts_u, 116 * 4);
@ -349,15 +421,21 @@ static void test_pdtch(uint8_t *l2, int len)
dump_sbits((uint8_t *)bursts_s, 348);
/* Decode */
rc = gsm0503_pdtch_decode(result, bursts_s, NULL,
&n_errors, &n_bits_total);
if (tmb->is_egprs) {
/* gsm0503_pdtch_egprs_decode() is meant to decode EGPRS UL frames, so we cannot use it here */
rc = gsm0503_pdtch_egprs_decode(result, bursts_s, rc, NULL, &n_errors, &n_bits_total);
OSMO_ASSERT(rc == -EIO);
return;
} else {
rc = gsm0503_pdtch_decode(result, bursts_s, NULL, &n_errors, &n_bits_total);
}
CHECK_RC_OR_RET(rc == len, "decoding");
printf("Decoded: %s\n", osmo_hexdump(result, len));
printf("pdtch_decode: n_errors=%d n_bits_total=%d ber=%.2f\n",
n_errors, n_bits_total, (float)n_errors/n_bits_total);
OSMO_ASSERT(!memcmp(l2, result, len));
OSMO_ASSERT(!memcmp(tmb->l2, result, len));
printf("\n");
}
@ -377,21 +455,6 @@ uint8_t test_l2[][23] = {
0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17 },
};
uint8_t test_macblock[][54] = {
/* Random frame */
{ 0xa3, 0xaf, 0x5f, 0xc6, 0x36, 0x43, 0x44, 0xab,
0xd9, 0x6d, 0x7d, 0x62, 0x24, 0xc9, 0xd2, 0x92,
0xfa, 0x27, 0x5d, 0x71, 0x7a, 0x59, 0xa8, 0x42,
0xa3, 0xaf, 0x5f, 0xc6, 0x36, 0x43, 0x44, 0xab,
0xa3, 0xaf, 0x5f, 0xc6, 0x36, 0x43, 0x44, 0xab,
0xd9, 0x6d, 0x7d, 0x62, 0x24, 0xc9, 0xd2, 0x92,
0xfa, 0x27, 0x5d, 0x71, 0x7a, 0xa8 },
/* jolly frame */
{ 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08,
0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10,
0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17 },
};
/* 11-bit Access Burst soft-bits (payload only) from an EGPRS capable phone (BSIC 63) */
static const sbit_t test_rach_11bit[6][36] = {
{ 103, 109, -108, -110, 107, 108, -106, -120, -121,
@ -480,10 +543,14 @@ int main(int argc, char **argv)
test_hr(test_l2[i], sizeof(test_l2[0]));
for (i = 0; i < len_mb; i++) {
test_pdtch(test_macblock[i], 23);
test_pdtch(test_macblock[i], 34);
test_pdtch(test_macblock[i], 40);
test_pdtch(test_macblock[i], 54);
if (test_macblock[i].is_egprs) {
test_pdtch(&test_macblock[i], test_macblock[i].l2_len);
} else {
test_pdtch(&test_macblock[i], 23);
test_pdtch(&test_macblock[i], 34);
test_pdtch(&test_macblock[i], 40);
test_pdtch(&test_macblock[i], 54);
}
}
printf("Success\n");

View File

@ -356,4 +356,15 @@ S-Bits:
Decoded: 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f 10 11 12 13 14 15 16 17 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
pdtch_decode: n_errors=0 n_bits_total=444 ber=0.00
Encoding: 07 40 00 16 10 42 02 56 56 56 86 80 03 56 56 56 56 56 56 56 56 56 56 56 56 56 00
U-Bits:
100111000001011111111010101010011100010011111010000110110 00 00 000110110000010000000011000000000110011001100110010000000
100010010000000000001101001111110010100100001000100111010 00 01 001001010101100010111000000000010111100011100011010001001
111100001101001011010000110111100001001001000001000100110 00 01 000000110110110100011111011110011001101100000111100010001
001000110011010110011011001011100100010001101101011100000 01 00 000010000010010110001111111001011101011000000011101100010
S-Bits:
81 7f 7f 81 81 81 7f 7f 7f 7f 7f 81 7f 81 81 81 81 81 81 81 81 7f 81 7f 81 7f 81 7f 81 7f 7f 81 81 81 7f 7f 7f 81 7f 7f 81 81 81 81 81 7f 81 7f 7f 7f 7f 81 81 7f 81 81 7f 7f 7f 7f 7f 7f 81 81 7f 81 81 7f 7f 7f 7f 7f 81 7f 7f 7f 7f 7f 7f 7f 7f 81 81 7f 7f 7f 7f 7f 7f 7f 7f 7f 81 81 7f 7f 81 81 7f 7f 81 81 7f 7f 81 81 7f 7f 81 7f 7f 7f 7f 7f 7f 7f
81 7f 7f 7f 81 7f 7f 81 7f 7f 7f 7f 7f 7f 7f 7f 7f 7f 7f 7f 81 81 7f 81 7f 7f 81 81 81 81 81 81 7f 7f 81 7f 81 7f 7f 81 7f 7f 7f 7f 81 7f 7f 7f 81 7f 7f 81 81 81 7f 81 7f 7f 81 7f 7f 81 7f 7f 81 7f 81 7f 81 7f 81 81 7f 7f 7f 81 7f 81 81 81 7f 7f 7f 7f 7f 7f 7f 7f 7f 7f 81 7f 81 81 81 81 7f 7f 7f 81 81 81 7f 7f 7f 81 81 7f 81 7f 7f 7f 81 7f 7f 81
81 81 81 81 7f 7f 7f 7f 81 81 7f 81 7f 7f 81 7f 81 81 7f 81 7f 7f 7f 7f 81 81 7f 81 81 81 81 7f 7f 7f 7f 81 7f 7f 81 7f 7f 81 7f 7f 7f 7f 7f 81 7f 7f 7f 81 7f 7f 81 81 7f 7f 81 7f 7f 7f 7f 7f 7f 81 81 7f 81 81 7f 81 81 7f 81 7f 7f 7f 81 81 81 81 81 7f 81 81 81 81 7f 7f 81 81 7f 7f 81 81 7f 81 81 7f 7f 7f 7f 7f 81 81 81 81 7f 7f 7f 81 7f 7f 7f 81
7f 7f 81 7f 7f 7f 81 81 7f 7f 81 81 7f 81 7f 81 81 7f 7f 81 81 7f 81 81 7f 7f 81 7f 81 81 81 7f 7f 81 7f 7f 7f 81 7f 7f 7f 81 81 7f 81 81 7f 81 7f 81 81 81 7f 7f 7f 7f 7f 81 7f 7f 7f 7f 7f 81 7f 7f 7f 7f 7f 81 7f 7f 81 7f 81 81 7f 7f 7f 81 81 81 81 81 81 81 7f 7f 81 7f 81 81 81 7f 81 7f 81 81 7f 7f 7f 7f 7f 7f 7f 81 81 81 7f 81 81 7f 7f 7f 81 7f
Success