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DTX fix ONSET handling 

* re-introduce ST_ONSET_F to guard from repetitive ONSET messages in case
  multiple FACCH occur duriing DTX silence period.
* produce ONSET event after both SID FIRST and UPDATE in case of AMR FR.
* always dispatch E_SID_F (SID FIRST) signal if in talkspurt.
* allow E_SID_* right after ONSET (zero-length talkspurt).
* add missing E_ONSET signal description.
* fix FSM transitions for AMR HR *Inhibited and First P*.
* fix incorrect return from l1if_tch_encode() in ONSET FACCH with
  incoming SID UPDATE

Change-Id: I0e9033c5f169da46aed9a0d1295faff489778dcf
Related: OS#1801
This commit is contained in:
Max 2016-10-28 16:52:48 +02:00 committed by Harald Welte
parent 4008ebb925
commit acfccb3f02
9 changed files with 66 additions and 32 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
include/osmo-bts/dtx_dl_amr_fsm.h
View File

@ -16,6 +16,7 @@ enum dtx_dl_amr_fsm_states {
ST_U_INH,
ST_SID_U,
ST_ONSET_V,
ST_ONSET_F,
ST_FACCH_V,
ST_FACCH,
};

3
src/common/bts.c
View File

@ -40,6 +40,7 @@
#include <osmo-bts/abis.h>
#include <osmo-bts/bts.h>
#include <osmo-bts/bts_model.h>
#include <osmo-bts/dtx_dl_amr_fsm.h>
#include <osmo-bts/pcu_if.h>
#include <osmo-bts/rsl.h>
#include <osmo-bts/oml.h>
@ -176,6 +177,8 @@ int bts_init(struct gsm_bts *bts)
INIT_LLIST_HEAD(&btsb->smscb_state.queue);
INIT_LLIST_HEAD(&btsb->oml_queue);
/* register DTX DL FSM */
osmo_fsm_register(&dtx_dl_amr_fsm);
return rc;
}

35
src/common/dtx_dl_amr_fsm.c
View File

@ -53,7 +53,7 @@ void dtx_fsm_sid_f1(struct osmo_fsm_inst *fi, uint32_t event, void *data)
osmo_fsm_inst_state_chg(fi, ST_VOICE, 0, 0);
break;
case E_FACCH:
osmo_fsm_inst_state_chg(fi, ST_FACCH, 0, 0);
osmo_fsm_inst_state_chg(fi, ST_ONSET_F, 0, 0);
break;
case E_COMPL:
osmo_fsm_inst_state_chg(fi, ST_SID_F2, 0, 0);
@ -81,7 +81,10 @@ void dtx_fsm_sid_f2(struct osmo_fsm_inst *fi, uint32_t event, void *data)
osmo_fsm_inst_state_chg(fi, ST_VOICE, 0, 0);
break;
case E_FACCH:
osmo_fsm_inst_state_chg(fi, ST_FACCH, 0, 0);
osmo_fsm_inst_state_chg(fi, ST_ONSET_F, 0, 0);
break;
case E_ONSET:
osmo_fsm_inst_state_chg(fi, ST_ONSET_V, 0, 0);
break;
default:
LOGP(DL1P, LOGL_ERROR, "Unexpected event %d\n", event);
@ -97,7 +100,7 @@ void dtx_fsm_f1_inh(struct osmo_fsm_inst *fi, uint32_t event, void *data)
osmo_fsm_inst_state_chg(fi, ST_ONSET_V, 0, 0);
break;
case E_FACCH:
osmo_fsm_inst_state_chg(fi, ST_FACCH, 0, 0);
osmo_fsm_inst_state_chg(fi, ST_ONSET_F, 0, 0);
break;
default:
LOGP(DL1P, LOGL_ERROR, "Unexpected event %d\n", event);
@ -110,7 +113,7 @@ void dtx_fsm_u_inh(struct osmo_fsm_inst *fi, uint32_t event, void *data)
{
switch (event) {
case E_VOICE:
osmo_fsm_inst_state_chg(fi, ST_ONSET_V, 0, 0);
osmo_fsm_inst_state_chg(fi, ST_VOICE, 0, 0);
break;
case E_FACCH:
osmo_fsm_inst_state_chg(fi, ST_FACCH, 0, 0);
@ -126,7 +129,7 @@ void dtx_fsm_sid_upd(struct osmo_fsm_inst *fi, uint32_t event, void *data)
{
switch (event) {
case E_FACCH:
osmo_fsm_inst_state_chg(fi, ST_FACCH, 0, 0);
osmo_fsm_inst_state_chg(fi, ST_ONSET_F, 0, 0);
break;
case E_VOICE:
osmo_fsm_inst_state_chg(fi, ST_VOICE, 0, 0);
@ -152,6 +155,7 @@ void dtx_fsm_sid_upd(struct osmo_fsm_inst *fi, uint32_t event, void *data)
void dtx_fsm_onset_v(struct osmo_fsm_inst *fi, uint32_t event, void *data)
{
switch (event) {
case E_SID_F:
case E_SID_U:
case E_VOICE:
osmo_fsm_inst_state_chg(fi, ST_VOICE, 0, 0);
@ -169,6 +173,7 @@ void dtx_fsm_onset_v(struct osmo_fsm_inst *fi, uint32_t event, void *data)
void dtx_fsm_onset_f(struct osmo_fsm_inst *fi, uint32_t event, void *data)
{
switch (event) {
case E_SID_F:
case E_SID_U:
break;
case E_VOICE:
@ -234,15 +239,15 @@ static struct osmo_fsm_state dtx_dl_amr_fsm_states[] = {
start of silence period (might be interrupted in case of AMR HR) */
[ST_SID_F1]= {
.in_event_mask = X(E_SID_F) | X(E_SID_U) | X(E_VOICE) | X(E_FACCH) | X(E_COMPL) | X(E_INHIB) | X(E_ONSET),
.out_state_mask = X(ST_SID_U) | X(ST_VOICE) | X(ST_FACCH) | X(ST_SID_F2) | X(ST_F1_INH) | X(ST_ONSET_V),
.out_state_mask = X(ST_SID_U) | X(ST_VOICE) | X(ST_ONSET_F) | X(ST_SID_F2) | X(ST_F1_INH) | X(ST_ONSET_V),
.name = "SID-FIRST (P1)",
.action = dtx_fsm_sid_f1,
},
/* SID-FIRST P2 (only for AMR HR):
actual start of silence period in case of AMR HR*/
[ST_SID_F2]= {
.in_event_mask = X(E_SID_U) | X(E_VOICE) | X(E_FACCH),
.out_state_mask = X(ST_SID_U) | X(ST_VOICE) | X(ST_FACCH),
.in_event_mask = X(E_SID_U) | X(E_VOICE) | X(E_FACCH) | X(E_ONSET),
.out_state_mask = X(ST_SID_U) | X(ST_VOICE) | X(ST_ONSET_F) | X(ST_ONSET_V),
.name = "SID-FIRST (P2)",
.action = dtx_fsm_sid_f2,
},
@ -258,24 +263,31 @@ static struct osmo_fsm_state dtx_dl_amr_fsm_states[] = {
incoming SPEECH or FACCH (only for AMR HR) */
[ST_U_INH]= {
.in_event_mask = X(E_VOICE) | X(E_FACCH),
.out_state_mask = X(ST_VOICE) | X(ST_FACCH_V),
.out_state_mask = X(ST_VOICE) | X(ST_FACCH),
.name = "SID-UPDATE (Inh)",
.action = dtx_fsm_u_inh,
},
/* Silence period with periodic comfort noise data updates */
[ST_SID_U]= {
.in_event_mask = X(E_FACCH) | X(E_VOICE) | X(E_INHIB) | X(E_SID_U) | X(E_SID_F) | X(E_ONSET),
.out_state_mask = X(ST_FACCH) | X(ST_VOICE) | X(ST_U_INH) | X(ST_SID_U) | X(ST_ONSET_V),
.out_state_mask = X(ST_ONSET_F) | X(ST_VOICE) | X(ST_U_INH) | X(ST_SID_U) | X(ST_ONSET_V),
.name = "SID-UPDATE",
.action = dtx_fsm_sid_upd,
},
/* ONSET - end of silent period due to incoming SPEECH frame */
[ST_ONSET_V]= {
.in_event_mask = X(E_VOICE) | X(E_FACCH),
.in_event_mask = X(E_SID_F) | X(E_SID_U) | X(E_VOICE) | X(E_FACCH),
.out_state_mask = X(ST_VOICE) | X(ST_FACCH_V),
.name = "ONSET (SPEECH)",
.action = dtx_fsm_onset_v,
},
/* ONSET - end of silent period due to incoming FACCH frame */
[ST_ONSET_F]= {
.in_event_mask = X(E_VOICE) | X(E_FACCH) | X(E_SID_U) | X(E_SID_F),
.out_state_mask = X(ST_VOICE) | X(ST_FACCH),
.name = "ONSET (FACCH)",
.action = dtx_fsm_onset_f,
},
/* FACCH sending state: SPEECH was observed before so once we're done
FSM should get back to VOICE state */
[ST_FACCH_V]= {
@ -296,6 +308,7 @@ static struct osmo_fsm_state dtx_dl_amr_fsm_states[] = {
const struct value_string dtx_dl_amr_fsm_event_names[] = {
{ E_VOICE, "Voice" },
{ E_ONSET, "ONSET" },
{ E_FACCH, "FACCH" },
{ E_COMPL, "Complete P1 -> P2" },
{ E_INHIB, "Inhibit" },

10
src/common/l1sap.c
View File

@ -1145,10 +1145,12 @@ int l1sap_chan_act(struct gsm_bts_trx *trx, uint8_t chan_nr, struct tlv_parsed *
/* Init DTX DL FSM if necessary */
//FIXME: only do it for AMR TCH/*
osmo_fsm_register(&dtx_dl_amr_fsm);
lchan->tch.dtx.dl_amr_fsm = osmo_fsm_inst_alloc(&dtx_dl_amr_fsm,
tall_bts_ctx, lchan,
LOGL_DEBUG, lchan->name);
if (trx->bts->dtxd)
lchan->tch.dtx.dl_amr_fsm = osmo_fsm_inst_alloc(&dtx_dl_amr_fsm,
tall_bts_ctx,
lchan,
LOGL_DEBUG,
lchan->name);
return 0;
}

39
src/common/msg_utils.c
View File

@ -33,6 +33,8 @@
#include <arpa/inet.h>
#include <errno.h>
#define STI_BIT_MASK 16
static int check_fom(struct abis_om_hdr *omh, size_t len)
{
if (omh->length != len) {
@ -182,14 +184,15 @@ int dtx_dl_amr_fsm_step(struct gsm_lchan *lchan, const uint8_t *rtp_pl,
return 0;
if (osmo_amr_is_speech(ft)) {
if (lchan->tch.dtx.dl_amr_fsm->state == ST_SID_F1 ||
lchan->tch.dtx.dl_amr_fsm->state == ST_SID_U) /* AMR HR */
if (lchan->type == GSM_LCHAN_TCH_H && marker)
return osmo_fsm_inst_dispatch(lchan->tch.dtx.dl_amr_fsm,
E_INHIB,
(void *)lchan);
/* AMR FR */
if (marker && lchan->tch.dtx.dl_amr_fsm->state == ST_SID_U)
/* AMR HR - Inhibition */
if (lchan->type == GSM_LCHAN_TCH_H && marker &&
lchan->tch.dtx.dl_amr_fsm->state == ST_SID_F1)
return osmo_fsm_inst_dispatch(lchan->tch.dtx.dl_amr_fsm,
E_INHIB, (void *)lchan);
/* AMR FR & HR - generic */
if (marker && (lchan->tch.dtx.dl_amr_fsm->state == ST_SID_F1 ||
lchan->tch.dtx.dl_amr_fsm->state == ST_SID_F2 ||
lchan->tch.dtx.dl_amr_fsm->state == ST_SID_U ))
return osmo_fsm_inst_dispatch(lchan->tch.dtx.dl_amr_fsm,
E_ONSET, (void *)lchan);
return osmo_fsm_inst_dispatch(lchan->tch.dtx.dl_amr_fsm, E_VOICE,
@ -198,6 +201,9 @@ int dtx_dl_amr_fsm_step(struct gsm_lchan *lchan, const uint8_t *rtp_pl,
if (ft == AMR_SID) {
dtx_cache_payload(lchan, rtp_pl, rtp_pl_len, fn, sti);
if (lchan->tch.dtx.dl_amr_fsm->state == ST_VOICE)
return osmo_fsm_inst_dispatch(lchan->tch.dtx.dl_amr_fsm,
E_SID_F, (void *)lchan);
return osmo_fsm_inst_dispatch(lchan->tch.dtx.dl_amr_fsm,
sti ? E_SID_U : E_SID_F,
(void *)lchan);
@ -215,6 +221,16 @@ int dtx_dl_amr_fsm_step(struct gsm_lchan *lchan, const uint8_t *rtp_pl,
return 0;
}
static inline void dtx_sti_set(struct gsm_lchan *lchan)
{
lchan->tch.dtx.cache[6 + 2] |= STI_BIT_MASK;
}
/* STI is located in payload byte 6, cache contains 2 byte prefix (CMR/CMI) */
static inline void dtx_sti_unset(struct gsm_lchan *lchan)
{
lchan->tch.dtx.cache[6 + 2] &= ~STI_BIT_MASK;
}
/*! \brief Check if enough time has passed since last SID (if any) to repeat it
* \param[in] lchan Logical channel on which we check scheduling
* \param[in] fn Frame Number for which we check scheduling
@ -226,9 +242,10 @@ static inline bool dtx_amr_sid_optional(struct gsm_lchan *lchan, uint32_t fn)
uint32_t dx26 = 120 * (fn - lchan->tch.dtx.fn);
/* We're resuming after FACCH interruption */
if (lchan->tch.dtx.dl_amr_fsm->state == ST_FACCH) {
if (lchan->tch.dtx.dl_amr_fsm->state == ST_FACCH ||
lchan->tch.dtx.dl_amr_fsm->state == ST_ONSET_F) {
/* force STI bit to 0 so cache is treated as SID FIRST */
lchan->tch.dtx.cache[6 + 2] &= ~16;
dtx_sti_unset(lchan);
lchan->tch.dtx.is_update = false;
osmo_fsm_inst_dispatch(lchan->tch.dtx.dl_amr_fsm, E_SID_F,
(void *)lchan);
@ -306,7 +323,7 @@ uint8_t repeat_last_sid(struct gsm_lchan *lchan, uint8_t *dst, uint32_t fn)
lchan->tch.dtx.fn = fn;
/* enforce SID UPDATE for next repetition - it might have
been altered by FACCH handling */
lchan->tch.dtx.cache[6 + 2] |= 16;
dtx_sti_set(lchan);
if (lchan->tch.dtx.dl_amr_fsm->state == ST_SID_U)
lchan->tch.dtx.is_update = true;
return lchan->tch.dtx.len + 1;

2
src/osmo-bts-litecell15/l1_if.c
View File

@ -410,7 +410,7 @@ static int ph_data_req(struct gsm_bts_trx *trx, struct msgb *msg,
memcpy(l1p->u.phDataReq.msgUnitParam.u8Buffer,
lchan->tch.dtx.facch, msgb_l2len(msg));
else if (trx->bts->dtxd && lchan->tch.dtx.dl_amr_fsm &&
lchan->tch.dtx.dl_amr_fsm->state == ST_FACCH) {
lchan->tch.dtx.dl_amr_fsm->state == ST_ONSET_F) {
if (sapi == GsmL1_Sapi_FacchF) {
sapi = GsmL1_Sapi_TchF;
}

3
src/osmo-bts-litecell15/tch.c
View File

@ -328,8 +328,7 @@ int l1if_tch_encode(struct gsm_lchan *lchan, uint8_t *data, uint8_t *len,
return -EAGAIN;
case ST_FACCH_V:
case ST_FACCH:
/* FIXME: if this possible at all? */
return 0;
return -EBADMSG;
default:
LOGP(DRTP, LOGL_ERROR, "Unhandled DTX DL AMR FSM state "
"%d\n", lchan->tch.dtx.dl_amr_fsm->state);

2
src/osmo-bts-sysmo/l1_if.c
View File

@ -405,7 +405,7 @@ static int ph_data_req(struct gsm_bts_trx *trx, struct msgb *msg,
memcpy(l1p->u.phDataReq.msgUnitParam.u8Buffer,
lchan->tch.dtx.facch, msgb_l2len(msg));
else if (trx->bts->dtxd && lchan->tch.dtx.dl_amr_fsm &&
lchan->tch.dtx.dl_amr_fsm->state == ST_FACCH) {
lchan->tch.dtx.dl_amr_fsm->state == ST_ONSET_F) {
if (sapi == GsmL1_Sapi_FacchF) {
sapi = GsmL1_Sapi_TchF;
}

3
src/osmo-bts-sysmo/tch.c
View File

@ -426,8 +426,7 @@ int l1if_tch_encode(struct gsm_lchan *lchan, uint8_t *data, uint8_t *len,
return -EAGAIN;
case ST_FACCH_V:
case ST_FACCH:
/* FIXME: if this possible at all? */
return 0;
return -EBADMSG;
default:
LOGP(DRTP, LOGL_ERROR, "Unhandled DTX DL AMR FSM state "
"%d\n", lchan->tch.dtx.dl_amr_fsm->state);