Osmocom Packet control Unit (PCU): Network-side GPRS (RLC/MAC); BTS- or BSC-colocated https://osmocom.org/projects/osmopcu
You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
 
 
 
 
 
osmo-pcu/src/gprs_pcu.c

195 lines
7.4 KiB

/*
* Copyright (C) 2013 by Holger Hans Peter Freyther
* Copyright (C) 2021 by sysmocom - s.f.m.c. GmbH <info@sysmocom.de>
* Author: Pau Espin Pedrol <pespin@sysmocom.de>
*
* All Rights Reserved
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation; either version 3 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 Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
#include <osmocom/core/utils.h>
#include <osmocom/core/linuxlist.h>
#include <osmocom/ctrl/ports.h>
#include "gprs_pcu.h"
#include "bts.h"
struct gprs_pcu *the_pcu;
static struct osmo_tdef T_defs_pcu[] = {
{ .T=3113, .default_val=7, .unit=OSMO_TDEF_S, .desc="Timeout for paging", .val=0 },
{ .T=3190, .default_val=5, .unit=OSMO_TDEF_S, .desc="Return to packet idle mode after Packet DL Assignment on CCCH (s)", .val=0},
{ .T=3141, .default_val=10, .unit=OSMO_TDEF_S, .desc="Timeout for contention resolution procedure (s)", .val=0 },
{ .T=PCU_TDEF_NEIGH_RESOLVE_TO, .default_val=1000, .unit=OSMO_TDEF_MS, .desc="[ARFCN+BSIC]->[RAC+CI] resolution timeout (ms)", .val=0 },
{ .T=PCU_TDEF_SI_RESOLVE_TO, .default_val=1000, .unit=OSMO_TDEF_MS, .desc="RIM RAN-INFO response timeout (ms)", .val=0 },
{ .T=PCU_TDEF_NEIGH_CACHE_ALIVE, .default_val=5, .unit=OSMO_TDEF_S, .desc="[ARFCN+BSIC]->[RAC+CI] resolution cache entry storage timeout (s)", .val=0 },
{ .T=PCU_TDEF_SI_CACHE_ALIVE, .default_val=5, .unit=OSMO_TDEF_S, .desc="[RAC+CI]->[SI] resolution cache entry storage timeout (s)", .val=0 },
{ .T=-101, .default_val=30, .unit=OSMO_TDEF_S, .desc="BSSGP (un)blocking procedures timer (s)", .val=0 },
{ .T=-102, .default_val=30, .unit=OSMO_TDEF_S, .desc="BSSGP reset procedure timer (s)", .val=0 },
{ .T=-2000, .default_val=2, .unit=OSMO_TDEF_MS, .desc="Delay release of UL TBF after tx Packet Access Reject (PACCH) (ms)", .val=0 },
{ .T=-2001, .default_val=2, .unit=OSMO_TDEF_S, .desc="PACCH assignment timeout (s)", .val=0 },
{ .T=-2002, .default_val=200, .unit=OSMO_TDEF_MS, .desc="Waiting after IMM.ASS confirm timer (ms)", .val=0 },
{ .T=-2030, .default_val=60, .unit=OSMO_TDEF_S, .desc="Time to keep an idle MS object alive (s)", .val=0 }, /* slightly above T3314 (default 44s, 24.008, 11.2.2) */
{ .T=-2031, .default_val=2000, .unit=OSMO_TDEF_MS, .desc="Time to keep an idle DL TBF alive (ms)", .val=0 },
{ .T=0, .default_val=0, .unit=OSMO_TDEF_S, .desc=NULL, .val=0 } /* empty item at the end */
};
static int gprs_pcu_talloc_destructor(struct gprs_pcu *pcu)
{
neigh_cache_free(pcu->neigh_cache);
si_cache_free(pcu->si_cache);
return 0;
}
struct gprs_pcu *gprs_pcu_alloc(void *ctx)
{
struct gprs_pcu *pcu;
pcu = (struct gprs_pcu *)talloc_zero(ctx, struct gprs_pcu);
OSMO_ASSERT(pcu);
talloc_set_destructor(pcu, gprs_pcu_talloc_destructor);
pcu->vty.fc_interval = 1;
pcu->vty.max_cs_ul = MAX_GPRS_CS;
pcu->vty.max_cs_dl = MAX_GPRS_CS;
pcu->vty.max_mcs_ul = MAX_EDGE_MCS;
pcu->vty.max_mcs_dl = MAX_EDGE_MCS;
pcu->vty.force_alpha = (uint8_t)-1; /* don't force by default, use BTS SI13 provided value */
pcu->vty.dl_tbf_preemptive_retransmission = true;
/* By default resegmentation is supported in DL can also be configured
* through VTY */
pcu->vty.dl_arq_type = EGPRS_ARQ1;
pcu->vty.cs_adj_enabled = true;
pcu->vty.cs_adj_upper_limit = 33; /* Decrease CS if the error rate is above */
pcu->vty.cs_adj_lower_limit = 10; /* Increase CS if the error rate is below */
pcu->vty.cs_downgrade_threshold = 200;
/* CS-1 to CS-4 */
pcu->vty.cs_lqual_ranges[0].low = -256;
pcu->vty.cs_lqual_ranges[0].high = 6;
pcu->vty.cs_lqual_ranges[1].low = 5;
pcu->vty.cs_lqual_ranges[1].high = 8;
pcu->vty.cs_lqual_ranges[2].low = 7;
pcu->vty.cs_lqual_ranges[2].high = 13;
pcu->vty.cs_lqual_ranges[3].low = 12;
pcu->vty.cs_lqual_ranges[3].high = 256;
/* MCS-1 to MCS-9 */
/* Default thresholds are referenced from literature */
/* Fig. 2.3, Chapter 2, Optimizing Wireless Communication Systems, Springer (2009) */
pcu->vty.mcs_lqual_ranges[0].low = -256;
pcu->vty.mcs_lqual_ranges[0].high = 6;
pcu->vty.mcs_lqual_ranges[1].low = 5;
pcu->vty.mcs_lqual_ranges[1].high = 8;
pcu->vty.mcs_lqual_ranges[2].low = 7;
pcu->vty.mcs_lqual_ranges[2].high = 13;
pcu->vty.mcs_lqual_ranges[3].low = 12;
pcu->vty.mcs_lqual_ranges[3].high = 15;
pcu->vty.mcs_lqual_ranges[4].low = 14;
pcu->vty.mcs_lqual_ranges[4].high = 17;
pcu->vty.mcs_lqual_ranges[5].low = 16;
pcu->vty.mcs_lqual_ranges[5].high = 18;
pcu->vty.mcs_lqual_ranges[6].low = 17;
pcu->vty.mcs_lqual_ranges[6].high = 20;
pcu->vty.mcs_lqual_ranges[7].low = 19;
pcu->vty.mcs_lqual_ranges[7].high = 24;
pcu->vty.mcs_lqual_ranges[8].low = 23;
pcu->vty.mcs_lqual_ranges[8].high = 256;
pcu->vty.ns_dialect = GPRS_NS2_DIALECT_IPACCESS;
pcu->vty.ns_ip_dscp = -1;
pcu->vty.ns_priority = -1;
/* TODO: increase them when CRBB decoding is implemented */
pcu->vty.ws_base = 64;
pcu->vty.ws_pdch = 0;
pcu->vty.llc_codel_interval_msec = LLC_CODEL_USE_DEFAULT;
pcu->vty.llc_idle_ack_csec = 10;
pcu->vty.neigh_ctrl_addr = NULL; /* don't use CTRL iface for Neigh Addr Resolution */
pcu->vty.neigh_ctrl_port = OSMO_CTRL_PORT_BSC_NEIGH;
pcu->T_defs = T_defs_pcu;
osmo_tdefs_reset(pcu->T_defs);
INIT_LLIST_HEAD(&pcu->bts_list);
pcu->neigh_cache = neigh_cache_alloc(pcu, osmo_tdef_get(pcu->T_defs, PCU_TDEF_NEIGH_CACHE_ALIVE, OSMO_TDEF_S, -1));
pcu->si_cache = si_cache_alloc(pcu, osmo_tdef_get(pcu->T_defs, PCU_TDEF_SI_CACHE_ALIVE, OSMO_TDEF_S, -1));
return pcu;
}
struct gprs_rlcmac_bts *gprs_pcu_get_bts_by_nr(struct gprs_pcu *pcu, uint8_t bts_nr)
{
struct gprs_rlcmac_bts *pos;
llist_for_each_entry(pos, &pcu->bts_list, list) {
if (pos->nr == bts_nr)
return pos;
}
return NULL;
}
struct gprs_rlcmac_bts *gprs_pcu_get_bts_by_cgi_ps(struct gprs_pcu *pcu, struct osmo_cell_global_id_ps *cgi_ps)
{
struct gprs_rlcmac_bts *pos;
llist_for_each_entry(pos, &pcu->bts_list, list) {
if (osmo_cgi_ps_cmp(&pos->cgi_ps, cgi_ps) == 0)
return pos;
}
return NULL;
}
void gprs_pcu_set_initial_cs(struct gprs_pcu *pcu, uint8_t cs_dl, uint8_t cs_ul)
{
struct gprs_rlcmac_bts *bts;
the_pcu->vty.initial_cs_dl = cs_dl;
the_pcu->vty.initial_cs_ul = cs_ul;
llist_for_each_entry(bts, &pcu->bts_list, list) {
bts_recalc_initial_cs(bts);
}
}
void gprs_pcu_set_initial_mcs(struct gprs_pcu *pcu, uint8_t mcs_dl, uint8_t mcs_ul)
{
struct gprs_rlcmac_bts *bts;
the_pcu->vty.initial_mcs_dl = mcs_dl;
the_pcu->vty.initial_mcs_ul = mcs_ul;
llist_for_each_entry(bts, &pcu->bts_list, list) {
bts_recalc_initial_mcs(bts);
}
}
void gprs_pcu_set_max_cs(struct gprs_pcu *pcu, uint8_t cs_dl, uint8_t cs_ul)
{
struct gprs_rlcmac_bts *bts;
the_pcu->vty.max_cs_dl = cs_dl;
the_pcu->vty.max_cs_ul = cs_ul;
llist_for_each_entry(bts, &pcu->bts_list, list) {
bts_recalc_max_cs(bts);
}
}
void gprs_pcu_set_max_mcs(struct gprs_pcu *pcu, uint8_t mcs_dl, uint8_t mcs_ul)
{
struct gprs_rlcmac_bts *bts;
the_pcu->vty.max_mcs_dl = mcs_dl;
the_pcu->vty.max_mcs_ul = mcs_ul;
llist_for_each_entry(bts, &pcu->bts_list, list) {
bts_recalc_max_mcs(bts);
}
}