/* Layer 1 Random Access Channel Burst */ /* (C) 2010 by Dieter Spaar * (C) 2010 by Harald Welte * * 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 #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include /* p1: type of operation (0: one NB, 1: one RACH burst, 2: four NB */ static int l1s_tx_rach_cmd(__unused uint8_t p1, __unused uint8_t p2, __unused uint16_t p3) { int i; uint16_t *info_ptr; uint8_t data[2]; putchart('T'); l1s_tx_apc_helper(); data[0] = l1s.serving_cell.bsic << 2; data[1] = l1s.rach.ra; info_ptr = &dsp_api.ndb->d_rach; info_ptr[0] = ((uint16_t)(data[0])) | ((uint16_t)(data[1])<<8); dsp_api.db_w->d_task_ra = RACH_DSP_TASK; dsp_end_scenario(); l1s_tx_win_ctrl(l1s.serving_cell.arfcn, L1_TXWIN_AB, 0); tpu_end_scenario(); return 0; } /* p1: type of operation (0: one NB, 1: one RACH burst, 2: four NB */ static int l1s_tx_rach_resp(__unused uint8_t p1, __unused uint8_t burst_id, __unused uint16_t p3) { putchart('t'); dsp_api.r_page_used = 1; return 0; } /* sched sets for uplink */ const struct tdma_sched_item rach_sched_set_ul[] = { SCHED_ITEM(l1s_tx_rach_cmd, 1, 0), SCHED_END_FRAME(), SCHED_END_FRAME(), SCHED_ITEM(l1s_tx_rach_resp, 1, 0), SCHED_END_FRAME(), SCHED_END_SET() }; /* request a RACH request at the next multiframe T3 = fn51 */ void l1a_rach_req(uint8_t fn51, uint8_t ra) { uint32_t fn_sched; l1a_lock_sync(); l1s.rach.ra = ra; /* TODO: can we wrap here? I don't think so */ fn_sched = l1s.current_time.fn - l1s.current_time.t3; fn_sched += fn51; sched_gsmtime(rach_sched_set_ul, fn_sched, 0); l1a_unlock_sync(); }