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neels gerrit-no-reply at lists.osmocom.orgneels has uploaded this change for review. ( https://gerrit.osmocom.org/c/osmo-bsc/+/21977 )
Change subject: hodec2: clarify current and target rxlev per candidate
......................................................................
hodec2: clarify current and target rxlev per candidate
Store the rxlev of the current lchan and the target BTS in the
ho_candidate, to clarify the code.
No functional change, cosmetically prepare for
I2704899c85c35dfd4eba43468452483f40016ca2.
Change-Id: Ie6c165e17bb3c99eebc967a6bb02529db8bdfc98
---
M src/osmo-bsc/handover_decision_2.c
1 file changed, 51 insertions(+), 48 deletions(-)
git pull ssh://gerrit.osmocom.org:29418/osmo-bsc refs/changes/77/21977/1
diff --git a/src/osmo-bsc/handover_decision_2.c b/src/osmo-bsc/handover_decision_2.c
index 7854f09..ae9435f 100644
--- a/src/osmo-bsc/handover_decision_2.c
+++ b/src/osmo-bsc/handover_decision_2.c
@@ -104,7 +104,8 @@
struct gsm_bts *bts; /* target BTS in local BSS */
const struct gsm0808_cell_id_list2 *cil; /* target cells in remote BSS */
uint8_t requirements; /* what is fulfilled */
- int avg; /* average RX level */
+ int rxlev_current;
+ int rxlev_target;
};
enum ho_reason {
@@ -236,6 +237,15 @@
return NULL;
}
+static int current_rxlev(struct gsm_lchan *lchan)
+{
+ struct gsm_bts *bts = lchan->ts->trx->bts;
+ return get_meas_rep_avg(lchan,
+ ho_get_hodec2_full_tdma(bts->ho) ?
+ MEAS_REP_DL_RXLEV_FULL : MEAS_REP_DL_RXLEV_SUB,
+ ho_get_hodec2_rxlev_avg_win(bts->ho));
+}
+
/* obtain averaged rxlev for given neighbor */
static int neigh_meas_avg(struct neigh_meas_proc *nmp, int window)
{
@@ -814,7 +824,7 @@
/* verbosely log about a handover candidate */
static inline void debug_candidate(struct ho_candidate *candidate,
- int8_t rxlev, int tchf_count, int tchh_count)
+ int tchf_count, int tchh_count)
{
struct gsm_lchan *lchan = candidate->lchan;
@@ -831,25 +841,25 @@
if (candidate->cil)
LOGPHOLCHANTOREMOTE(lchan, candidate->cil, LOGL_DEBUG,
"RX level %d dBm -> %d dBm\n",
- rxlev2dbm(rxlev), rxlev2dbm(candidate->avg));
+ rxlev2dbm(candidate->rxlev_current), rxlev2dbm(candidate->rxlev_target));
if (candidate->bts == lchan->ts->trx->bts)
LOGPHOLCHANTOBTS(lchan, candidate->bts, LOGL_DEBUG,
"RX level %d dBm; "
HO_CANDIDATE_FMT(f, F) "; " HO_CANDIDATE_FMT(h, H) "\n",
- rxlev2dbm(candidate->avg),
+ rxlev2dbm(candidate->rxlev_current),
HO_CANDIDATE_ARGS(f, F), HO_CANDIDATE_ARGS(h, H));
else if (candidate->bts)
LOGPHOLCHANTOBTS(lchan, candidate->bts, LOGL_DEBUG,
"RX level %d dBm -> %d dBm; "
HO_CANDIDATE_FMT(f, F) "; " HO_CANDIDATE_FMT(h, H) "\n",
- rxlev2dbm(rxlev), rxlev2dbm(candidate->avg),
+ rxlev2dbm(candidate->rxlev_current), rxlev2dbm(candidate->rxlev_target),
HO_CANDIDATE_ARGS(f, F), HO_CANDIDATE_ARGS(h, H));
}
/* add candidate for re-assignment within the current cell */
static void collect_assignment_candidate(struct gsm_lchan *lchan, struct ho_candidate *clist,
- unsigned int *candidates, int av_rxlev)
+ unsigned int *candidates, int rxlev_current)
{
struct gsm_bts *bts = lchan->ts->trx->bts;
int tchf_count, tchh_count;
@@ -862,10 +872,11 @@
.lchan = lchan,
.bts = bts,
.requirements = check_requirements(lchan, bts, tchf_count, tchh_count),
- .avg = av_rxlev,
+ .rxlev_current = rxlev_current,
+ .rxlev_target = rxlev_current, /* same cell, same rxlev */
};
- debug_candidate(&c, 0, tchf_count, tchh_count);
+ debug_candidate(&c, tchf_count, tchh_count);
if (!c.requirements)
return;
@@ -877,7 +888,7 @@
/* add candidates for handover to all neighbor cells */
static void collect_handover_candidate(struct gsm_lchan *lchan, struct neigh_meas_proc *nmp,
struct ho_candidate *clist, unsigned int *candidates,
- bool include_weaker_rxlev, int av_rxlev,
+ bool include_weaker_rxlev, int rxlev_current,
int *neighbors_count)
{
struct gsm_bts *bts = lchan->ts->trx->bts;
@@ -890,7 +901,6 @@
.arfcn = nmp->arfcn,
.bsic = nmp->bsic,
};
- int avg;
struct ho_candidate c;
int min_rxlev;
struct handover_cfg *neigh_cfg;
@@ -929,27 +939,25 @@
* instead assume the local BTS' config to apply. */
neigh_cfg = (neighbor_bts ? : bts)->ho;
- /* calculate average rxlev for this cell over the window */
- avg = neigh_meas_avg(nmp, ho_get_hodec2_rxlev_neigh_avg_win(bts->ho));
-
c = (struct ho_candidate){
.lchan = lchan,
- .avg = avg,
.nik = ni,
.bts = neighbor_bts,
.cil = neighbor_cil,
+ .rxlev_current = rxlev_current,
+ .rxlev_target = neigh_meas_avg(nmp, ho_get_hodec2_rxlev_neigh_avg_win(bts->ho)),
};
/* Heed rxlev hysteresis only if the RXLEV/RXQUAL/TA levels of the MS aren't critically bad and
* we're just looking for an improvement. If levels are critical, we desperately need a handover
* and thus skip the hysteresis check. */
if (!include_weaker_rxlev) {
- unsigned int pwr_hyst = ho_get_hodec2_pwr_hysteresis(bts->ho);
- if (avg <= (av_rxlev + pwr_hyst)) {
+ int pwr_hyst = ho_get_hodec2_pwr_hysteresis(bts->ho);
+ if ((c.rxlev_target - c.rxlev_current) <= pwr_hyst) {
LOGPHOCAND(&c, LOGL_DEBUG,
"Not a candidate, because RX level (%d dBm) is lower"
" or equal than current RX level (%d dBm) + hysteresis (%d)\n",
- rxlev2dbm(avg), rxlev2dbm(av_rxlev), pwr_hyst);
+ rxlev2dbm(c.rxlev_target), rxlev2dbm(c.rxlev_current), pwr_hyst);
return;
}
}
@@ -957,11 +965,11 @@
/* if the minimum level is not reached.
* In case of a remote-BSS, use the current BTS' configuration. */
min_rxlev = ho_get_hodec2_min_rxlev(neigh_cfg);
- if (rxlev2dbm(avg) < min_rxlev) {
+ if (rxlev2dbm(c.rxlev_target) < min_rxlev) {
LOGPHOCAND(&c, LOGL_DEBUG,
"Not a candidate, because RX level (%d dBm) is lower"
" than the minimum required RX level (%d dBm)\n",
- rxlev2dbm(avg), min_rxlev);
+ rxlev2dbm(c.rxlev_target), min_rxlev);
return;
}
@@ -973,7 +981,7 @@
} else
c.requirements = check_requirements_remote_bss(lchan, neighbor_cil);
- debug_candidate(&c, av_rxlev, tchf_count, tchh_count);
+ debug_candidate(&c, tchf_count, tchh_count);
if (!c.requirements)
return;
@@ -984,30 +992,25 @@
static void collect_candidates_for_lchan(struct gsm_lchan *lchan,
struct ho_candidate *clist, unsigned int *candidates,
- int *_av_rxlev, bool include_weaker_rxlev)
+ int *_rxlev_current, bool include_weaker_rxlev)
{
struct gsm_bts *bts = lchan->ts->trx->bts;
- int av_rxlev;
+ int rxlev_current;
bool assignment;
bool handover;
int neighbors_count = 0;
- unsigned int rxlev_avg_win = ho_get_hodec2_rxlev_avg_win(bts->ho);
OSMO_ASSERT(candidates);
- /* calculate average rxlev for this cell over the window */
- av_rxlev = get_meas_rep_avg(lchan,
- ho_get_hodec2_full_tdma(bts->ho) ?
- MEAS_REP_DL_RXLEV_FULL : MEAS_REP_DL_RXLEV_SUB,
- rxlev_avg_win);
- if (_av_rxlev)
- *_av_rxlev = av_rxlev;
+ rxlev_current = current_rxlev(lchan);
+ if (_rxlev_current)
+ *_rxlev_current = rxlev_current;
/* in case there is no measurement report (yet) */
- if (av_rxlev < 0) {
+ if (rxlev_current < 0) {
LOGPHOLCHAN(lchan, LOGL_DEBUG, "Not collecting candidates, not enough measurements"
" (got %d, want %u)\n",
- lchan->meas_rep_count, rxlev_avg_win);
+ lchan->meas_rep_count, ho_get_hodec2_rxlev_avg_win(bts->ho));
return;
}
@@ -1015,14 +1018,14 @@
handover = ho_get_ho_active(bts->ho);
if (assignment)
- collect_assignment_candidate(lchan, clist, candidates, av_rxlev);
+ collect_assignment_candidate(lchan, clist, candidates, rxlev_current);
if (handover) {
int i;
for (i = 0; i < ARRAY_SIZE(lchan->neigh_meas); i++) {
collect_handover_candidate(lchan, &lchan->neigh_meas[i],
clist, candidates,
- include_weaker_rxlev, av_rxlev, &neighbors_count);
+ include_weaker_rxlev, rxlev_current, &neighbors_count);
}
}
}
@@ -1083,7 +1086,7 @@
struct gsm_bts *bts = lchan->ts->trx->bts;
int ahs = (lchan->tch_mode == GSM48_CMODE_SPEECH_AMR
&& lchan->type == GSM_LCHAN_TCH_H);
- int av_rxlev;
+ int rxlev_current;
struct ho_candidate clist[1 + ARRAY_SIZE(lchan->neigh_meas)];
unsigned int candidates = 0;
int i;
@@ -1099,7 +1102,7 @@
return 0;
}
- collect_candidates_for_lchan(lchan, clist, &candidates, &av_rxlev, include_weaker_rxlev);
+ collect_candidates_for_lchan(lchan, clist, &candidates, &rxlev_current, include_weaker_rxlev);
/* If assignment is disabled and no neighbor cell report exists, or no neighbor cell qualifies,
* we may not even have any candidates. */
@@ -1121,7 +1124,7 @@
if (!clist[i].bts)
continue;
- better = clist[i].avg - av_rxlev;
+ better = clist[i].rxlev_target - clist[i].rxlev_current;
/* Apply AFS bias? */
afs_bias = 0;
if (ahs && (clist[i].requirements & REQUIREMENT_B_TCHF))
@@ -1137,7 +1140,7 @@
/* perform handover, if there is a candidate */
if (best_cand) {
LOGPHOCAND(best_cand, LOGL_INFO, "Best candidate, RX level %d%s\n",
- rxlev2dbm(best_cand->avg),
+ rxlev2dbm(best_cand->rxlev_target),
best_applied_afs_bias ? " (applied AHS -> AFS rxlev bias)" : "");
return trigger_ho(best_cand, best_cand->requirements & REQUIREMENT_B_MASK);
}
@@ -1154,7 +1157,7 @@
if (!clist[i].bts)
continue;
- better = clist[i].avg - av_rxlev;
+ better = clist[i].rxlev_target - clist[i].rxlev_current;
/* Apply AFS bias? */
afs_bias = 0;
if (ahs && (clist[i].requirements & REQUIREMENT_C_TCHF))
@@ -1170,7 +1173,7 @@
/* perform handover, if there is a candidate */
if (best_cand) {
LOGPHOCAND(best_cand, LOGL_INFO, "Best candidate, RX level %d%s\n",
- rxlev2dbm(best_cand->avg),
+ rxlev2dbm(best_cand->rxlev_target),
best_applied_afs_bias? " (applied AHS -> AFS rxlev bias)" : "");
return trigger_ho(best_cand, best_cand->requirements & REQUIREMENT_C_MASK);
}
@@ -1191,7 +1194,7 @@
if (!(clist[i].requirements & REQUIREMENT_A_MASK))
continue;
- better = clist[i].avg - av_rxlev;
+ better = clist[i].rxlev_target - clist[i].rxlev_current;
/* Apply AFS bias?
* (never to remote-BSS neighbors, since we will not change the lchan type for those.) */
afs_bias = 0;
@@ -1209,7 +1212,7 @@
/* perform handover, if there is a candidate */
if (best_cand) {
LOGPHOCAND(best_cand, LOGL_INFO, "Best candidate: RX level %d%s\n",
- rxlev2dbm(best_cand->avg),
+ rxlev2dbm(best_cand->rxlev_target),
best_applied_afs_bias ? " (applied AHS -> AFS rxlev bias)" : "");
return trigger_ho(best_cand, best_cand->requirements & REQUIREMENT_A_MASK);
}
@@ -1475,7 +1478,7 @@
&& (intra_cell && upgrade_to_tch_f))
continue;
- avg_rxlev = c->avg;
+ avg_rxlev = c->rxlev_target;
/* improve AHS */
if (upgrade_to_tch_f)
@@ -1639,7 +1642,7 @@
LOGPHOCAND(&clist[i], LOGL_DEBUG, "#%d: req={TCH/F:" REQUIREMENTS_FMT ", TCH/H:" REQUIREMENTS_FMT "} avg-rxlev=%d dBm\n",
i, REQUIREMENTS_ARGS(clist[i].requirements, F),
REQUIREMENTS_ARGS(clist[i].requirements, H),
- rxlev2dbm(clist[i].avg));
+ rxlev2dbm(clist[i].rxlev_target));
}
}
@@ -1662,7 +1665,7 @@
if (best_cand) {
any_ho = 1;
LOGPHOCAND(best_cand, LOGL_DEBUG, "Best candidate: RX level %d%s\n",
- rxlev2dbm(best_cand->avg),
+ rxlev2dbm(best_cand->rxlev_target),
is_improved ? " (applied AHS->AFS bias)" : "");
trigger_ho(best_cand, best_cand->requirements & REQUIREMENT_B_MASK);
#if 0
@@ -1703,7 +1706,7 @@
if (best_cand) {
any_ho = 1;
LOGPHOCAND(best_cand, LOGL_INFO, "Worst candidate: RX level %d from TCH/H -> TCH/F%s\n",
- rxlev2dbm(best_cand->avg),
+ rxlev2dbm(best_cand->rxlev_target),
is_improved ? " (applied AHS -> AFS rxlev bias)" : "");
trigger_ho(best_cand, best_cand->requirements & REQUIREMENT_B_MASK);
#if 0
@@ -1738,7 +1741,7 @@
if (best_cand) {
any_ho = 1;
LOGPHOCAND(best_cand, LOGL_INFO, "Best candidate: RX level %d%s\n",
- rxlev2dbm(best_cand->avg),
+ rxlev2dbm(best_cand->rxlev_target),
is_improved ? " (applied AHS -> AFS rxlev bias)" : "");
trigger_ho(best_cand, best_cand->requirements & REQUIREMENT_C_MASK);
#if 0
@@ -1781,7 +1784,7 @@
if (best_cand) {
any_ho = 1;
LOGPHOCAND(best_cand, LOGL_INFO, "Worst candidate: RX level %d from TCH/H -> TCH/F%s\n",
- rxlev2dbm(best_cand->avg),
+ rxlev2dbm(best_cand->rxlev_target),
is_improved ? " (applied AHS -> AFS rxlev bias)" : "");
trigger_ho(best_cand, best_cand->requirements & REQUIREMENT_C_MASK);
#if 0
--
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Gerrit-Project: osmo-bsc
Gerrit-Branch: master
Gerrit-Change-Id: Ie6c165e17bb3c99eebc967a6bb02529db8bdfc98
Gerrit-Change-Number: 21977
Gerrit-PatchSet: 1
Gerrit-Owner: neels <nhofmeyr at sysmocom.de>
Gerrit-MessageType: newchange
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