143 lines
4.8 KiB
C
143 lines
4.8 KiB
C
/*******************************************************************************
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OpenAirInterface
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Copyright(c) 1999 - 2014 Eurecom
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OpenAirInterface is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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OpenAirInterface is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with OpenAirInterface.The full GNU General Public License is
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included in this distribution in the file called "COPYING". If not,
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see <http://www.gnu.org/licenses/>.
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Contact Information
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OpenAirInterface Admin: openair_admin@eurecom.fr
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OpenAirInterface Tech : openair_tech@eurecom.fr
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OpenAirInterface Dev : openair4g-devel@lists.eurecom.fr
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Address : Eurecom, Campus SophiaTech, 450 Route des Chappes, CS 50193 - 06904 Biot Sophia Antipolis cedex, FRANCE
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*******************************************************************************/
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/*! \file eNB_agent_scheduler_dlsch_ue_remote.c
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* \brief procedures related to remote scheduling in the DLSCH transport channel
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* \author Xenofon Foukas
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* \date 2016
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* \email: x.foukas@sms.ed.ac.uk
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* \version 0.1
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* @ingroup _mac
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*/
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#include "eNB_agent_scheduler_dlsch_ue_remote.h"
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struct DlMacConfigHead queue_head;
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int queue_initialized = 0;
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void schedule_ue_spec_remote(mid_t mod_id, uint32_t frame, uint32_t subframe,
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int *mbsfn_flag, Protocol__ProgranMessage **dl_info) {
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if (queue_initialized) {
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TAILQ_INIT(&queue_head);
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queue_initialized = 1;
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}
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dl_mac_config_element_t *dl_config_elem;
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int diff;
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// First we check to see if we have a scheduling decision for this sfn_sf already in our queue
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while(queue_head.tqh_first != NULL) {
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dl_config_elem = queue_head.tqh_first;
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diff = get_sf_difference(mod_id, dl_config_elem->dl_info->dl_mac_config_msg->sfn_sf);
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// Check if this decision is for now, for a later or a previous subframe
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if ( diff == 0) { // Now
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TAILQ_REMOVE(&queue_head, queue_head.tqh_first, configs);
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*dl_info = dl_config_elem->dl_info;
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free(dl_config_elem);
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return;
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} else if (diff < 0) { //previous subframe , delete message and free memory
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TAILQ_REMOVE(&queue_head, queue_head.tqh_first, configs);
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enb_agent_mac_destroy_dl_config(dl_config_elem->dl_info);
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free(dl_config_elem);
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} else { // next subframe, nothing to do now
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enb_agent_create_empty_dl_config(mod_id, dl_info);
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return;
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}
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}
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//Done with the local cache. Now we need to check if something new arrived
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enb_agent_get_pending_dl_mac_config(mod_id, dl_info);
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while (*dl_info != NULL) {
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diff = get_sf_difference(mod_id, (*dl_info)->dl_mac_config_msg->sfn_sf);
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if (diff == 0) { // Got a command for this sfn_sf
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return;
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} else if (diff < 0) {
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enb_agent_mac_destroy_dl_config(*dl_info);
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} else { // Intended for future subframe. Store it in local cache
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dl_mac_config_element_t *e = malloc(sizeof(dl_mac_config_element_t));
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TAILQ_INSERT_TAIL(&queue_head, e, configs);
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enb_agent_create_empty_dl_config(mod_id, dl_info);
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// No need to look for another. Messages arrive ordered
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return;
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}
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enb_agent_get_pending_dl_mac_config(mod_id, dl_info);
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}
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// We found no pending command, so we will simply pass an empty one
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enb_agent_create_empty_dl_config(mod_id, dl_info);
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}
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int get_sf_difference(mid_t mod_id, uint16_t sfn_sf) {
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int diff_in_subframes;
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uint16_t current_frame = get_current_system_frame_num(mod_id);
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uint16_t current_subframe = get_current_subframe(mod_id);
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uint16_t current_sfn_sf = get_sfn_sf(mod_id);
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if (sfn_sf == current_sfn_sf) {
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return 0;
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}
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uint16_t frame_mask = ((1<<12) - 1);
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uint16_t frame = (sfn_sf & (frame_mask << 4)) >> 4;
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uint16_t sf_mask = ((1<<4) - 1);
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uint16_t subframe = (sfn_sf & sf_mask);
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if (frame == current_frame) {
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return subframe - current_subframe;
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} else if (frame > current_frame) {
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diff_in_subframes = 9 - current_subframe;
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diff_in_subframes += (subframe + 1);
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diff_in_subframes += (frame-2) * 10;
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if (diff_in_subframes > SCHED_AHEAD_SUBFRAMES) {
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return -1;
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} else {
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return 1;
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}
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} else { //frame < current_frame
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diff_in_subframes = 9 - current_subframe;
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diff_in_subframes += (subframe + 1);
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if (frame > 0) {
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diff_in_subframes += (frame - 1) * 10;
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}
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diff_in_subframes += (1023 - current_frame) * 10;
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if (diff_in_subframes > SCHED_AHEAD_SUBFRAMES) {
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return -1;
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} else {
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return 1;
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}
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}
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}
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