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-rw-r--r--src/osmo-bts-trx/sched_lchan_tchh.c124
1 files changed, 96 insertions, 28 deletions
diff --git a/src/osmo-bts-trx/sched_lchan_tchh.c b/src/osmo-bts-trx/sched_lchan_tchh.c
index 541feab8..6ab4c319 100644
--- a/src/osmo-bts-trx/sched_lchan_tchh.c
+++ b/src/osmo-bts-trx/sched_lchan_tchh.c
@@ -1,7 +1,7 @@
/*
* (C) 2013 by Andreas Eversberg <jolly@eversberg.eu>
* (C) 2015-2017 by Harald Welte <laforge@gnumonks.org>
- * Contributions by sysmocom - s.f.m.c. GmbH
+ * (C) 2020-2023 by sysmocom - s.f.m.c. GmbH <info@sysmocom.de>
*
* All Rights Reserved
*
@@ -91,16 +91,51 @@ static const uint8_t sched_tchh_ul_facch_map[26] = {
/* TDMA frame number of burst 'a' is used as the table index. */
extern const uint8_t sched_tchh_dl_facch_map[26];
+/* 3GPP TS 45.002, table 2 in clause 7: Mapping tables for TCH/H2.4 and TCH/H4.8.
+ *
+ * +---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+
+ * | a | b | c | d | e | f | g | h | i | j | k | l | m | n | o | p | q | r | s | t | u | v |
+ * +---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+---+
+ *
+ * TCH/H(0): B0(0,2,4,6,8,10,13,15,17,19,21,23,0,2,4,6,8,10,13,15,17,19)
+ * TCH/H(1): B0(1,3,5,7,9,11,14,16,18,20,22,24,1,3,5,7,9,11,14,16,18,20)
+ * TCH/H(0): B1(8,10,13,15,17,19,21,23,0,2,4,6,8,10,13,15,17,19,21,23,0,2)
+ * TCH/H(1): B1(9,11,14,16,18,20,22,24,1,3,5,7,9,11,14,16,18,20,22,24,1,3)
+ * TCH/H(0): B2(17,19,21,23,0,2,4,6,8,10,13,15,17,19,21,23,0,2,4,6,8,10)
+ * TCH/H(1): B2(18,20,22,24,1,3,5,7,9,11,14,16,18,20,22,24,1,3,5,7,9,11)
+ *
+ * TDMA frame number of burst 'v' % 26 is the table index.
+ * This mapping is valid for both TCH/H(0) and TCH/H(1). */
+static const uint8_t sched_tchh_ul_csd_map[26] = {
+ [19] = 1, /* TCH/H(0): B0(0 ... 19) */
+ [20] = 1, /* TCH/H(1): B0(1 ... 20) */
+ [2] = 1, /* TCH/H(0): B1(8 ... 2) */
+ [3] = 1, /* TCH/H(1): B1(9 ... 3) */
+ [10] = 1, /* TCH/H(0): B2(17 ... 10) */
+ [11] = 1, /* TCH/H(1): B2(18 ... 11) */
+};
+
+/* TDMA frame number of burst 'a' % 26 is the table index.
+ * This mapping is valid for both TCH/H(0) and TCH/H(1). */
+static const uint8_t sched_tchh_dl_csd_map[26] = {
+ [0] = 1, /* TCH/H(0): B0(0 ... 19) */
+ [1] = 1, /* TCH/H(1): B0(1 ... 20) */
+ [8] = 1, /* TCH/H(0): B1(8 ... 2) */
+ [9] = 1, /* TCH/H(1): B1(9 ... 3) */
+ [17] = 1, /* TCH/H(0): B2(17 ... 10) */
+ [18] = 1, /* TCH/H(1): B2(18 ... 11) */
+};
+
/*! \brief a single TCH/H burst was received by the PHY, process it */
int rx_tchh_fn(struct l1sched_ts *l1ts, const struct trx_ul_burst_ind *bi)
{
struct l1sched_chan_state *chan_state = &l1ts->chan_state[bi->chan];
struct gsm_lchan *lchan = chan_state->lchan;
sbit_t *burst, *bursts_p = chan_state->ul_bursts;
- uint8_t *mask = &chan_state->ul_mask;
+ uint32_t *mask = &chan_state->ul_mask;
uint8_t rsl_cmode = chan_state->rsl_cmode;
uint8_t tch_mode = chan_state->tch_mode;
- uint8_t tch_data[128]; /* just to be safe */
+ uint8_t tch_data[240]; /* large enough to hold 240 unpacked bits for CSD */
int rc = 0; /* initialize to make gcc happy */
int amr = 0;
int n_errors = 0;
@@ -123,9 +158,8 @@ int rx_tchh_fn(struct l1sched_ts *l1ts, const struct trx_ul_burst_ind *bi)
/* shift the buffer by 2 bursts leftwards */
if (bi->bid == 0) {
- memcpy(bursts_p, bursts_p + 232, 232);
- memcpy(bursts_p + 232, bursts_p + 464, 232);
- memset(bursts_p + 464, 0, 232);
+ memmove(BUFPOS(bursts_p, 0), BUFPOS(bursts_p, 2), 20 * BPLEN);
+ memset(BUFPOS(bursts_p, 20), 0, 2 * BPLEN);
*mask = *mask << 2;
}
@@ -135,8 +169,8 @@ int rx_tchh_fn(struct l1sched_ts *l1ts, const struct trx_ul_burst_ind *bi)
/* store measurements */
trx_sched_meas_push(chan_state, bi);
- /* copy burst to end of buffer of 6 bursts */
- burst = bursts_p + bi->bid * 116 + 464;
+ /* copy burst to end of buffer of 24 bursts */
+ burst = BUFPOS(bursts_p, 20 + bi->bid);
if (bi->burst_len > 0) {
memcpy(burst, bi->burst + 3, 58);
memcpy(burst + 58, bi->burst + 87, 58);
@@ -165,14 +199,16 @@ int rx_tchh_fn(struct l1sched_ts *l1ts, const struct trx_ul_burst_ind *bi)
goto bfi;
}
- /* decode
- * also shift buffer by 4 bursts for interleaving */
+ /* TCH/H: speech and signalling frames are interleaved over 4 and 6 bursts,
+ * respectively, while CSD frames are interleaved over 22 bursts. Unless
+ * we're in CSD mode, decode only the last 6 bursts to avoid introducing
+ * additional delays. */
switch (tch_mode) {
case GSM48_CMODE_SIGN:
meas_avg_mode = SCHED_MEAS_AVG_M_S6N6;
/* fall-through */
case GSM48_CMODE_SPEECH_V1: /* HR or signalling */
- rc = gsm0503_tch_hr_decode2(tch_data, bursts_p,
+ rc = gsm0503_tch_hr_decode2(tch_data, BUFTAIL8(bursts_p),
!sched_tchh_ul_facch_map[bi->fn % 26],
&n_errors, &n_bits_total);
if (rc == GSM_HR_BYTES) { /* only for valid *speech* frames */
@@ -199,7 +235,7 @@ int rx_tchh_fn(struct l1sched_ts *l1ts, const struct trx_ul_burst_ind *bi)
/* See comment in function rx_tchf_fn() */
amr = sizeof(struct amr_hdr);
- rc = gsm0503_tch_ahs_decode_dtx(tch_data + amr, bursts_p,
+ rc = gsm0503_tch_ahs_decode_dtx(tch_data + amr, BUFTAIL8(bursts_p),
!sched_tchh_ul_facch_map[bi->fn % 26],
!fn_is_cmi, chan_state->codec,
chan_state->codecs, &chan_state->ul_ft,
@@ -255,6 +291,22 @@ int rx_tchh_fn(struct l1sched_ts *l1ts, const struct trx_ul_burst_ind *bi)
}
break;
+ /* CSD (TCH/H4.8): 6.0 kbit/s radio interface rate */
+ case GSM48_CMODE_DATA_6k0:
+ if (!sched_tchh_ul_csd_map[bi->fn % 26])
+ return 0; /* CSD: skip decoding attempt, need 2 more bursts */
+ rc = gsm0503_tch_hr48_decode(&tch_data[0], BUFPOS(bursts_p, 0),
+ &n_errors, &n_bits_total);
+ meas_avg_mode = SCHED_MEAS_AVG_M_S22N22;
+ break;
+ /* CSD (TCH/H2.4): 3.6 kbit/s radio interface rate */
+ case GSM48_CMODE_DATA_3k6:
+ if (!sched_tchh_ul_csd_map[bi->fn % 26])
+ return 0; /* CSD: skip decoding attempt, need 2 more bursts */
+ rc = gsm0503_tch_hr24_decode(&tch_data[0], BUFPOS(bursts_p, 0),
+ &n_errors, &n_bits_total);
+ meas_avg_mode = SCHED_MEAS_AVG_M_S22N22;
+ break;
default:
LOGL1SB(DL1P, LOGL_ERROR, l1ts, bi,
"TCH mode %u invalid, please fix!\n",
@@ -308,7 +360,7 @@ bfi:
rc = 0;
}
- if (rsl_cmode != RSL_CMOD_SPD_SPEECH)
+ if (rsl_cmode == RSL_CMOD_SPD_SIGN)
return 0;
/* TCH or BFI */
@@ -345,13 +397,14 @@ int tx_tchh_fn(struct l1sched_ts *l1ts, struct trx_dl_burst_req *br)
/* BURST BYPASS */
- /* shift buffer by 2 bursts for interleaving */
- memcpy(bursts_p, bursts_p + 232, 232);
- if (chan_state->dl_ongoing_facch) {
- memcpy(bursts_p + 232, bursts_p + 464, 232);
- memset(bursts_p + 464, 0, 232);
- } else {
- memset(bursts_p + 232, 0, 232);
+ /* shift buffer by 2 bursts for interleaving */
+ memmove(BUFPOS(bursts_p, 0), BUFPOS(bursts_p, 2), 20 * BPLEN);
+ memset(BUFPOS(bursts_p, 20), 0, 2 * BPLEN);
+
+ /* for half-rate CSD we dequeue every 4th burst */
+ if (chan_state->rsl_cmode == RSL_CMOD_SPD_DATA) {
+ if (!sched_tchh_dl_csd_map[br->fn % 26])
+ goto send_burst;
}
/* dequeue a message to be transmitted */
@@ -397,30 +450,45 @@ int tx_tchh_fn(struct l1sched_ts *l1ts, struct trx_dl_burst_req *br)
goto send_burst;
}
- gsm0503_tch_hr_encode(bursts_p, dummy, sizeof(dummy));
+ gsm0503_tch_hr_encode(BUFPOS(bursts_p, 0), dummy, sizeof(dummy));
chan_state->dl_ongoing_facch = 1;
chan_state->dl_facch_bursts = 6;
goto send_burst;
}
- /* populate the buffer with bursts */
if (msgb_l2len(msg) == GSM_MACBLOCK_LEN) {
- gsm0503_tch_hr_encode(bursts_p, msg->l2h, msgb_l2len(msg));
chan_state->dl_ongoing_facch = 1; /* first of two TCH frames */
chan_state->dl_facch_bursts = 6;
- } else if (tch_mode == GSM48_CMODE_SPEECH_AMR) {
+ }
+
+ /* populate the buffer with bursts */
+ switch (tch_mode) {
+ case GSM48_CMODE_SIGN:
+ case GSM48_CMODE_SPEECH_V1:
+ gsm0503_tch_hr_encode(BUFPOS(bursts_p, 0), msg->l2h, msgb_l2len(msg));
+ break;
+ case GSM48_CMODE_SPEECH_AMR:
/* the first FN 4,13,21 or 5,14,22 defines that CMI is included
* in frame, the first FN 0,8,17 or 1,9,18 defines that CMR is
* included in frame. */
- gsm0503_tch_ahs_encode(bursts_p,
+ gsm0503_tch_ahs_encode(BUFPOS(bursts_p, 0),
msgb_l2(msg), msgb_l2len(msg),
!sched_tchh_dl_amr_cmi_map[br->fn % 26],
chan_state->codec,
chan_state->codecs,
chan_state->dl_ft,
chan_state->dl_cmr);
- } else {
- gsm0503_tch_hr_encode(bursts_p, msg->l2h, msgb_l2len(msg));
+ break;
+ /* CSD (TCH/H4.8): 6.0 kbit/s radio interface rate */
+ case GSM48_CMODE_DATA_6k0:
+ gsm0503_tch_hr48_encode(BUFPOS(bursts_p, 0), msgb_l2(msg));
+ break;
+ /* CSD (TCH/H2.4): 3.6 kbit/s radio interface rate */
+ case GSM48_CMODE_DATA_3k6:
+ gsm0503_tch_hr24_encode(BUFPOS(bursts_p, 0), msgb_l2(msg));
+ break;
+ default:
+ OSMO_ASSERT(0);
}
/* free message */
@@ -428,7 +496,7 @@ int tx_tchh_fn(struct l1sched_ts *l1ts, struct trx_dl_burst_req *br)
send_burst:
/* compose burst */
- burst = bursts_p + br->bid * 116;
+ burst = BUFPOS(bursts_p, br->bid);
memcpy(br->burst + 3, burst, 58);
memcpy(br->burst + 61, TRX_GMSK_NB_TSC(br), 26);
memcpy(br->burst + 87, burst + 58, 58);
generated by cgit v1.2.3 (git 2.25.1) at 2024-06-05 12:30:49 +0000