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SRSUE RRC: More stable Reestablishment after RLF

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master
Xavier Arteaga 6 years ago committed by Andre Puschmann
parent bb663a69b8
commit 6f6560f12b
2 changed files with 88 additions and 56 deletions
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1
srsue/src/phy/sync.cc
Unescape Escape View File

@ -420,6 +420,7 @@ void sync::run_thread()
*/
switch(sfn_p.run_subframe(&cell, &tti)) {
case sfn_sync::SFN_FOUND:
stack->in_sync();
phy_state.state_exit();
break;
case sfn_sync::IDLE:

143
srsue/src/stack/rrc/rrc.cc
Unescape Escape View File

@ -634,12 +634,18 @@ void rrc::out_of_sync()
// CAUTION: We do not lock in this function since they are called from real-time threads
serving_cell->in_sync = false;
rrc_log->info("Received out-of-sync while in state %s. n310=%d, t311=%s, t310=%s\n",
rrc_state_text[state], n310_cnt,
mac_timers->timer_get(t311)->is_running()?"running":"stop",
mac_timers->timer_get(t310)->is_running()?"running":"stop");
// upon receiving N310 consecutive "out-of-sync" indications for the PCell from lower layers while neither T300,
// T301, T304 nor T311 is running:
if (state == RRC_STATE_CONNECTED) {
if (!mac_timers->timer_get(t311)->is_running() && !mac_timers->timer_get(t310)->is_running()) {
if (!mac_timers->timer_get(t300)->is_running() && !mac_timers->timer_get(t301)->is_running() &&
!mac_timers->timer_get(t304)->is_running() && !mac_timers->timer_get(t310)->is_running() &&
!mac_timers->timer_get(t311)->is_running()) {
rrc_log->info("Received out-of-sync while in state %s. n310=%d, t311=%s, t310=%s\n",
rrc_state_text[state],
n310_cnt,
mac_timers->timer_get(t311)->is_running() ? "running" : "stop",
mac_timers->timer_get(t310)->is_running() ? "running" : "stop");
n310_cnt++;
if (n310_cnt == N310) {
rrc_log->info("Detected %d out-of-sync from PHY. Trying to resync. Starting T310 timer %d ms\n",
@ -1690,6 +1696,7 @@ void rrc::leave_connected()
{
rrc_log->console("RRC IDLE\n");
rrc_log->info("Leaving RRC_CONNECTED state\n");
m_reest_cause = asn1::rrc::reest_cause_e::nulltype;
state = RRC_STATE_IDLE;
rlc_flush_counter = 0;
drb_up = false;
@ -1720,82 +1727,106 @@ void rrc::stop_timers()
mac_timers->timer_get(t304)->stop();
}
/* Implementation of procedure in 3GPP 36.331 Section 5.3.7.2: Initiation
*
* This procedure shall be only initiated when:
* - upon detecting radio link failure, in accordance with 5.3.11; or
* - upon handover failure, in accordance with 5.3.5.6; or
* - upon mobility from E-UTRA failure, in accordance with 5.4.3.5; or
* - upon integrity check failure indication from lower layers; or
* - upon an RRC connection reconfiguration failure, in accordance with 5.3.5.5;
*
* The parameter cause shall indicate the cause of the reestablishment according to the sections mentioned adobe.
*/
void rrc::init_con_restablish_request(asn1::rrc::reest_cause_e cause)
{
// Save reestablishment cause
m_reest_cause = cause;
// Save Current RNTI before MAC Reset
mac_interface_rrc::ue_rnti_t uernti;
mac->get_rntis(&uernti);
m_reest_rnti = uernti.crnti;
// initiation of reestablishment procedure as indicates in 3GPP 36.331 Section 5.3.7.2
rrc_log->info("Initiating RRC Connection Reestablishment Procedure\n");
rrc_log->console("Initiating RRC Connection Reestablishment Procedure (crnti=x%04x, t311=%d)\n",
m_reest_rnti,
mac_timers->timer_get(t311)->get_timeout());
// If security is activated, RRC connected and C-RNTI available
if (security_is_activated && state == RRC_STATE_CONNECTED && uernti.crnti != 0) {
// Save reestablishment cause and current C-RNTI
m_reest_rnti = uernti.crnti;
m_reest_cause = cause;
// stop timer T310, if running;
mac_timers->timer_get(t310)->stop();
// initiation of reestablishment procedure as indicates in 3GPP 36.331 Section 5.3.7.2
rrc_log->info("Initiating RRC Connection Reestablishment Procedure\n");
rrc_log->console("Initiating RRC Connection Reestablishment Procedure\n");
// start timer T311;
mac_timers->timer_get(t311)->reset();
mac_timers->timer_get(t311)->run();
// stop timer T310, if running;
mac_timers->timer_get(t310)->stop();
// suspend all RBs except SRB0;
// rlc->reset();
// start timer T311;
mac_timers->timer_get(t311)->reset();
mac_timers->timer_get(t311)->run();
// reset MAC;
mac->reset();
// suspend all RBs except SRB0;
// rlc->reestablish();
// pdcp->reset();
// apply the default physical channel configuration as specified in 9.2.4;
set_phy_default_pucch_srs();
// reset MAC;
mac->reset();
// apply the default physical channel configuration as specified in 9.2.4;
set_phy_default_pucch_srs();
// apply the default semi-persistent scheduling configuration as specified in 9.2.3;
// N.A.
// apply the default semi-persistent scheduling configuration as specified in 9.2.3;
// N.A.
// apply the default MAC main configuration as specified in 9.2.2;
apply_mac_config_dedicated_default();
// apply the default MAC main configuration as specified in 9.2.2;
apply_mac_config_dedicated_default();
// perform cell selection in accordance with the cell selection process as specified in TS 36.304 [4];
// ... this happens in rrc::run_tti()
// perform cell selection in accordance with the cell selection process as specified in TS 36.304 [4];
// ... this happens in rrc::run_tti()
} else {
// 3GPP 36.331 Section 5.3.7.1
// If AS security has not been activated, the UE does not initiate the procedure but instead
// moves to RRC_IDLE directly
go_idle = true;
}
}
/* Implementation of procedure in 3GPP 36.331 Section 5.3.7.3: Actions following cell selection while T311 is running
*/
void rrc::proc_con_restablish_request()
{
// Check timer...
if (mac_timers->timer_get(t311)->is_running()) {
// Check for synchronism
if (serving_cell->in_sync) {
// Perform cell selection in accordance to 36.304
if (cell_selection_criteria(serving_cell->get_rsrp())) {
// Perform cell selection in accordance to 36.304
if (phy->cell_select(&serving_cell->phy_cell)) {
// Actions following cell reselection while T311 is running 5.3.7.3
// Upon selecting a suitable E-UTRA cell, the UE shall:
rrc_log->info("Cell Selection criteria passed after %dms. Sending RRC Connection Reestablishment Request\n",
mac_timers->timer_get(t311)->value());
if (mac_timers->timer_get(t311)->is_running()) {
// Actions following cell reselection while T311 is running 5.3.7.3
rrc_log->info(
"Cell Selection finished. Initiating transmission of RRC Connection Reestablishment Request\n");
mac_timers->timer_get(t301)->reset();
mac_timers->timer_get(t301)->run();
mac_timers->timer_get(t311)->stop();
send_con_restablish_request();
} else {
rrc_log->info("T311 expired while selecting cell. Going to IDLE\n");
go_idle = true;
}
} else {
rrc_log->warning("Could not re-synchronize with cell.\n");
go_idle = true;
}
// stop timer T311;
mac_timers->timer_get(t301)->reset();
// start timer T301;
mac_timers->timer_get(t301)->run();
// apply the timeAlignmentTimerCommon included in SystemInformationBlockType2;
mac_timers->timer_get(t311)->stop();
// initiate transmission of the RRCConnectionReestablishmentRequest message in accordance with 5.3.7.4;
send_con_restablish_request();
} else {
go_idle = false;
// Upon selecting an inter-RAT cell
rrc_log->warning("Reestablishment Cell Selection criteria failed.\n");
rrc_log->console("Reestablishment Cell Selection criteria failed. in_sync=%d\n", serving_cell->in_sync);
leave_connected();
}
} else {
// No synchronized, do nothing
}
} else if (mac_timers->timer_get(t311)->is_expired()) {
go_idle = true;
}
if (go_idle) {
m_reest_cause = asn1::rrc::reest_cause_e::nulltype;
} else {
// t311 expired or stopped
rrc_log->info("T311 expired while selecting cell. Going to IDLE\n");
rrc_log->console("T311 expired while selecting cell. Going to IDLE\n");
leave_connected();
}
}

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