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osmo-pcu
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NACC: Configure neighbor and SI resolution timeout values 

Upon timeout, we move directly to NACC_ST_TX_CELL_CHG_CONTINUE in order
to submit a Cell Change Continue against the MS without providing any
Packet Neighbor Cell Data beforehand, as per spec that's probably the
best we can do in this scenario (TS 44.060):
"""
1)  The network responds with a PACKET CELL CHANGE CONTINUE message.
If a mobile station as response to a PACKET CELL CHANGE NOTIFICATION
message receives a PACKET CELL CHANGE CONTINUE message without receiving
any neighbour cell system information, the mobile station shall stop timer
T3208, stop timer T3210 if still running, leave CCN mode and continue cell
reselection in NC0/NC1 mode.
"""

Related: SYS#4909
Change-Id: Ia9932ab082ec095294e85dc4d532046970e17986
This commit is contained in:
Pau Espin 2021-01-26 19:00:37 +01:00
parent ab7159f6ec
commit 41a22a7ab8
3 changed files with 37 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
src/gprs_pcu.c
View File

@ -33,6 +33,8 @@ static struct osmo_tdef T_defs_pcu[] = {
{ .T=1, .default_val=30, .unit=OSMO_TDEF_S, .desc="BSSGP (un)blocking procedures timer (s)", .val=0 },
{ .T=2, .default_val=30, .unit=OSMO_TDEF_S, .desc="BSSGP reset procedure timer (s)", .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=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=-2000, .default_val=2, .unit=OSMO_TDEF_MS, .desc="Tbf reject for PRR timer (ms)", .val=0 },

2
src/gprs_pcu.h
View File

@ -37,6 +37,8 @@
#define MAX_EDGE_MCS 9
#define MAX_GPRS_CS 4
#define PCU_TDEF_NEIGH_RESOLVE_TO (-1)
#define PCU_TDEF_SI_RESOLVE_TO (-2)
#define PCU_TDEF_NEIGH_CACHE_ALIVE (-10)
#define PCU_TDEF_SI_CACHE_ALIVE (-11)

36
src/nacc_fsm.c
View File

@ -40,8 +40,24 @@
#define X(s) (1 << (s))
static const struct osmo_tdef_state_timeout nacc_fsm_timeouts[32] = {
[NACC_ST_INITIAL] = {},
[NACC_ST_WAIT_RESOLVE_RAC_CI] = { .T = PCU_TDEF_NEIGH_RESOLVE_TO },
[NACC_ST_WAIT_REQUEST_SI] = { .T = PCU_TDEF_SI_RESOLVE_TO },
[NACC_ST_TX_NEIGHBOUR_DATA] = {},
[NACC_ST_TX_CELL_CHG_CONTINUE] = {},
[NACC_ST_DONE] = {},
};
/* Transition to a state, using the T timer defined in assignment_fsm_timeouts.
* The actual timeout value is in turn obtained from conn->T_defs.
* Assumes local variable fi exists. */
#define nacc_fsm_state_chg(fi, NEXT_STATE) \
osmo_fsm_inst_state_chg(fi, NEXT_STATE, 0, 0)
osmo_tdef_fsm_inst_state_chg(fi, NEXT_STATE, \
nacc_fsm_timeouts, \
((struct nacc_fsm_ctx*)(fi->priv))->ms->bts->pcu->T_defs, \
-1)
const struct value_string nacc_fsm_event_names[] = {
{ NACC_EV_RX_CELL_CHG_NOTIFICATION, "RX_CELL_CHG_NOTIFICATION" },
@ -469,6 +485,17 @@ static void nacc_fsm_cleanup(struct osmo_fsm_inst *fi, enum osmo_fsm_term_cause
talloc_free(ctx);
}
static int nacc_fsm_timer_cb(struct osmo_fsm_inst *fi)
{
switch (fi->T) {
case PCU_TDEF_NEIGH_RESOLVE_TO:
case PCU_TDEF_SI_RESOLVE_TO:
nacc_fsm_state_chg(fi, NACC_ST_TX_CELL_CHG_CONTINUE);
break;
}
return 0;
}
static struct osmo_fsm_state nacc_fsm_states[] = {
[NACC_ST_INITIAL] = {
.in_event_mask =
@ -482,7 +509,8 @@ static struct osmo_fsm_state nacc_fsm_states[] = {
.in_event_mask =
X(NACC_EV_RX_RAC_CI),
.out_state_mask =
X(NACC_ST_WAIT_REQUEST_SI),
X(NACC_ST_WAIT_REQUEST_SI) |
X(NACC_ST_TX_CELL_CHG_CONTINUE),
.name = "WAIT_RESOLVE_RAC_CI",
.onenter = st_wait_resolve_rac_ci_on_enter,
.action = st_wait_resolve_rac_ci,
@ -492,7 +520,8 @@ static struct osmo_fsm_state nacc_fsm_states[] = {
X(NACC_EV_RX_CELL_CHG_NOTIFICATION) |
X(NACC_EV_RX_SI),
.out_state_mask =
X(NACC_ST_TX_NEIGHBOUR_DATA),
X(NACC_ST_TX_NEIGHBOUR_DATA) |
X(NACC_ST_TX_CELL_CHG_CONTINUE),
.name = "WAIT_REQUEST_SI",
.onenter = st_wait_request_si_on_enter,
.action = st_wait_request_si,
@ -529,6 +558,7 @@ static struct osmo_fsm nacc_fsm = {
.name = "NACC",
.states = nacc_fsm_states,
.num_states = ARRAY_SIZE(nacc_fsm_states),
.timer_cb = nacc_fsm_timer_cb,
.cleanup = nacc_fsm_cleanup,
.log_subsys = DNACC,
.event_names = nacc_fsm_event_names,