diff options
Diffstat (limited to 'src/host/trxcon/sched_lchan_rach.c')
| -rw-r--r-- | src/host/trxcon/sched_lchan_rach.c | 181 |
1 files changed, 0 insertions, 181 deletions
diff --git a/src/host/trxcon/sched_lchan_rach.c b/src/host/trxcon/sched_lchan_rach.c deleted file mode 100644 index 5d1f3ab9..00000000 --- a/src/host/trxcon/sched_lchan_rach.c +++ /dev/null @@ -1,181 +0,0 @@ -/* - * OsmocomBB <-> SDR connection bridge - * TDMA scheduler: handlers for DL / UL bursts on logical channels - * - * (C) 2017 by Vadim Yanitskiy <axilirator@gmail.com> - * - * All Rights Reserved - * - * 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., - * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. - * - */ - -#include <errno.h> -#include <string.h> -#include <stdint.h> -#include <stdbool.h> - -#include <osmocom/core/logging.h> -#include <osmocom/core/bits.h> - -#include <osmocom/gsm/gsm_utils.h> -#include <osmocom/coding/gsm0503_coding.h> - -#include "l1ctl_proto.h" -#include "scheduler.h" -#include "sched_trx.h" -#include "logging.h" -#include "trx_if.h" -#include "l1ctl.h" - -/* 3GPP TS 05.02, section 5.2.7 "Access burst (AB)" */ -#define RACH_EXT_TAIL_BITS_LEN 8 -#define RACH_SYNCH_SEQ_LEN 41 -#define RACH_PAYLOAD_LEN 36 - -/* Extended tail bits (BN0..BN7) */ -static const ubit_t rach_ext_tail_bits[] = { - 0, 0, 1, 1, 1, 0, 1, 0, -}; - -/* Synchronization (training) sequence types */ -enum rach_synch_seq_t { - RACH_SYNCH_SEQ_UNKNOWN = -1, - RACH_SYNCH_SEQ_TS0, /* GSM, GMSK (default) */ - RACH_SYNCH_SEQ_TS1, /* EGPRS, 8-PSK */ - RACH_SYNCH_SEQ_TS2, /* EGPRS, GMSK */ - RACH_SYNCH_SEQ_NUM -}; - -/* Synchronization (training) sequence bits */ -static const char rach_synch_seq_bits[RACH_SYNCH_SEQ_NUM][RACH_SYNCH_SEQ_LEN] = { - [RACH_SYNCH_SEQ_TS0] = "01001011011111111001100110101010001111000", - [RACH_SYNCH_SEQ_TS1] = "01010100111110001000011000101111001001101", - [RACH_SYNCH_SEQ_TS2] = "11101111001001110101011000001101101110111", -}; - -/* Synchronization (training) sequence names */ -static struct value_string rach_synch_seq_names[] = { - { RACH_SYNCH_SEQ_UNKNOWN, "UNKNOWN" }, - { RACH_SYNCH_SEQ_TS0, "TS0: GSM, GMSK" }, - { RACH_SYNCH_SEQ_TS1, "TS1: EGPRS, 8-PSK" }, - { RACH_SYNCH_SEQ_TS2, "TS2: EGPRS, GMSK" }, - { 0, NULL }, -}; - -/* Obtain a to-be-transmitted RACH burst */ -int tx_rach_fn(struct trx_instance *trx, struct trx_ts *ts, - struct trx_lchan_state *lchan, uint32_t fn, uint8_t bid) -{ - struct l1ctl_ext_rach_req *ext_req = NULL; - struct l1ctl_rach_req *req = NULL; - enum rach_synch_seq_t synch_seq; - uint8_t burst[GSM_BURST_LEN]; - uint8_t *burst_ptr = burst; - uint8_t payload[36]; - int i, rc; - - /* Is it extended (11-bit) RACH or not? */ - if (PRIM_IS_RACH11(lchan->prim)) { - ext_req = (struct l1ctl_ext_rach_req *) lchan->prim->payload; - synch_seq = ext_req->synch_seq; - - /* Check requested synch. sequence */ - if (synch_seq >= RACH_SYNCH_SEQ_NUM) { - LOGP(DSCHD, LOGL_ERROR, "Unknown RACH synch. sequence=0x%02x\n", synch_seq); - - /* Forget this primitive */ - sched_prim_drop(lchan); - return -ENOTSUP; - } - - /* Delay sending according to offset value */ - if (ext_req->offset-- > 0) - return 0; - - /* Encode extended (11-bit) payload */ - rc = gsm0503_rach_ext_encode(payload, ext_req->ra11, trx->bsic, true); - if (rc) { - LOGP(DSCHD, LOGL_ERROR, "Could not encode extended RACH burst " - "(ra=%u bsic=%u)\n", ext_req->ra11, trx->bsic); - - /* Forget this primitive */ - sched_prim_drop(lchan); - return rc; - } - } else if (PRIM_IS_RACH8(lchan->prim)) { - req = (struct l1ctl_rach_req *) lchan->prim->payload; - synch_seq = RACH_SYNCH_SEQ_TS0; - - /* Delay sending according to offset value */ - if (req->offset-- > 0) - return 0; - - /* Encode regular (8-bit) payload */ - rc = gsm0503_rach_ext_encode(payload, req->ra, trx->bsic, false); - if (rc) { - LOGP(DSCHD, LOGL_ERROR, "Could not encode RACH burst " - "(ra=%u bsic=%u)\n", req->ra, trx->bsic); - - /* Forget this primitive */ - sched_prim_drop(lchan); - return rc; - } - } else { - LOGP(DSCHD, LOGL_ERROR, "Primitive has odd length %zu (expected %zu or %zu), " - "so dropping...\n", lchan->prim->payload_len, - sizeof(*req), sizeof(*ext_req)); - sched_prim_drop(lchan); - return -EINVAL; - } - - - /* BN0-7: extended tail bits */ - memcpy(burst_ptr, rach_ext_tail_bits, RACH_EXT_TAIL_BITS_LEN); - burst_ptr += RACH_EXT_TAIL_BITS_LEN; - - /* BN8-48: chosen synch. (training) sequence */ - for (i = 0; i < RACH_SYNCH_SEQ_LEN; i++) - *(burst_ptr++) = rach_synch_seq_bits[synch_seq][i] == '1'; - - /* BN49-84: encrypted bits (the payload) */ - memcpy(burst_ptr, payload, RACH_PAYLOAD_LEN); - burst_ptr += RACH_PAYLOAD_LEN; - - /* BN85-156: tail bits & extended guard period */ - memset(burst_ptr, 0, burst + GSM_BURST_LEN - burst_ptr); - - LOGP(DSCHD, LOGL_NOTICE, "Transmitting %s RACH (%s) on fn=%u, tn=%u, lchan=%s\n", - PRIM_IS_RACH11(lchan->prim) ? "extended (11-bit)" : "regular (8-bit)", - get_value_string(rach_synch_seq_names, synch_seq), fn, - ts->index, trx_lchan_desc[lchan->type].name); - - /* Forward burst to scheduler */ - rc = sched_trx_handle_tx_burst(trx, ts, lchan, fn, burst); - if (rc) { - /* Forget this primitive */ - sched_prim_drop(lchan); - - return rc; - } - - /* Confirm RACH request */ - l1ctl_tx_rach_conf(trx->l1l, trx->band_arfcn, fn); - - /* Forget processed primitive */ - sched_prim_drop(lchan); - - return 0; -} |