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srsRAN_4G
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Implemented proper cell reselection. Tested reestablishment from one cell to another.

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master
Ismael Gomez 7 years ago
parent c0e79477b5
commit c69d4a37e8
5 changed files with 66 additions and 37 deletions
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6
srsue/hdr/upper/rrc.h
Unescape Escape View File

@ -152,9 +152,6 @@ private:
rrc_args_t args;
bool first_stimsi_attempt;
bool reestablishment_in_progress;
bool connection_requested;
bool pending_mob_reconf;
LIBLTE_RRC_CONNECTION_RECONFIGURATION_STRUCT mob_reconf;
@ -367,7 +364,8 @@ private:
void cell_reselection_eval(float rsrp, float rsrq);
bool cell_selection_eval(float rsrp, float rsrq = 0);
bool connection_requested;
void plmn_select_rrc(LIBLTE_RRC_PLMN_IDENTITY_STRUCT plmn_id);
// RLC interface
void max_retx_attempted();

11
srsue/src/phy/phch_recv.cc
Unescape Escape View File

@ -301,16 +301,17 @@ void phch_recv::cell_search_inc()
{
cur_earfcn_index++;
if (cur_earfcn_index >= 0) {
if (cur_earfcn_index >= (int) earfcn.size() - 1) {
if (cur_earfcn_index >= (int) earfcn.size()) {
cur_earfcn_index = 0;
rrc->earfcn_end();
}
}
} else {
Info("SYNC: Cell Search idx %d/%d\n", cur_earfcn_index, earfcn.size());
if (current_earfcn != earfcn[cur_earfcn_index]) {
current_earfcn = earfcn[cur_earfcn_index];
set_frequency();
}
}
}
}
void phch_recv::cell_search_next(bool reset) {
@ -329,6 +330,9 @@ void phch_recv::cell_search_next(bool reset) {
}
void phch_recv::cell_search_start() {
if (phy_state == CELL_CAMP) {
Warning("SYNC: Can't start cell search procedure while camping on cell\n");
} else {
if (earfcn.size() > 0) {
Info("SYNC: Starting Cell Search procedure in %d EARFCNs...\n", earfcn.size());
cell_search_next(true);
@ -336,6 +340,7 @@ void phch_recv::cell_search_start() {
Info("SYNC: Empty EARFCN list. Stopping cell search...\n");
log_h->console("Empty EARFCN list. Stopping cell search...\n");
}
}
}
void phch_recv::cell_search_stop() {

2
srsue/src/phy/phch_worker.cc
Unescape Escape View File

@ -268,7 +268,7 @@ void phch_worker::work_imp()
}
}
}
Info("dl_ack={%d, %d}, generate_ack=%d\n", dl_ack[0], dl_ack[1], dl_action.generate_ack);
Debug("dl_ack={%d, %d}, generate_ack=%d\n", dl_ack[0], dl_ack[1], dl_action.generate_ack);
if (dl_action.generate_ack) {
set_uci_ack(dl_ack, dl_mac_grant.tb_en);
}

6
srsue/src/upper/nas.cc
Unescape Escape View File

@ -108,7 +108,6 @@ void nas::attach_request() {
} else if (state == EMM_STATE_REGISTERED) {
nas_log->info("NAS state is registered, connecting to same PLMN\n");
rrc->plmn_select(current_plmn);
selecting_plmn = current_plmn;
} else {
nas_log->info("Attach request ignored. State = %s\n", emm_state_text[state]);
}
@ -125,6 +124,11 @@ void nas::deattach_request() {
void nas::plmn_found(LIBLTE_RRC_PLMN_IDENTITY_STRUCT plmn_id, uint16_t tracking_area_code) {
// Do not process new PLMN if already selected
if (plmn_selection == PLMN_SELECTED) {
return;
}
// Check if already registered
for (uint32_t i=0;i<known_plmns.size();i++) {
if (plmn_id.mcc == known_plmns[i].mcc && plmn_id.mnc == known_plmns[i].mnc) {

58
srsue/src/upper/rrc.cc
Unescape Escape View File

@ -96,8 +96,6 @@ void rrc::init(phy_interface_rrc *phy_,
pthread_mutex_init(&mutex, NULL);
first_stimsi_attempt = false;
reestablishment_in_progress = false;
connection_requested = false;
args.ue_category = SRSLTE_UE_CATEGORY;
args.supported_bands[0] = 7;
@ -176,14 +174,14 @@ void rrc::run_thread() {
if (nas->is_attaching()) {
sleep(1);
rrc_log->info("RRC IDLE: NAS is attaching and camping on cell, reselecting...\n");
plmn_select(selected_plmn_id);
plmn_select_rrc(selected_plmn_id);
}
// If not camping on a cell
} else {
// If NAS is attached, perform cell reselection on current PLMN
if (nas->is_attached()) {
rrc_log->info("RRC IDLE: NAS is attached, PHY not synchronized. Re-selecting cell...\n");
plmn_select(selected_plmn_id);
plmn_select_rrc(selected_plmn_id);
} else if (nas->is_attaching()) {
sleep(1);
rrc_log->info("RRC IDLE: NAS is attaching, searching again PLMN\n");
@ -204,6 +202,10 @@ void rrc::run_thread() {
}
break;
case RRC_STATE_CELL_SELECTING:
/* During cell selection, apply SIB configurations if available or receive them if not.
* Cell is selected when all SIBs downloaded or applied.
*/
if (phy->sync_status()) {
if (!current_cell->has_valid_sib1) {
si_acquire_state = SI_ACQUIRE_SIB1;
@ -216,29 +218,36 @@ void rrc::run_thread() {
state = RRC_STATE_CELL_SELECTED;
}
}
if (!reestablishment_in_progress) {
// Don't time out during restablishment (T311 running)
if (!mac_timers->timer_get(t311)->is_running()) {
select_cell_timeout++;
if (select_cell_timeout >= RRC_SELECT_CELL_TIMEOUT) {
rrc_log->info("RRC Cell Selecting: timeout expired. Starting Cell Search...\n");
state = RRC_STATE_PLMN_SELECTION;
plmn_select_timeout = 0;
select_cell_timeout = 0;
phy->cell_search_start();
}
}
break;
case RRC_STATE_CELL_SELECTED:
/* The cell is selected when the SIBs are received and applied.
* If we were in RRC_CONNECTED and arrive here it means a RLF occurred and we are in Reestablishment procedure.
* If T311 is running means there is a reestablishment in progress, send ConnectionReestablishmentRequest.
* If not, do a ConnectionRequest if NAS is established or go to IDLE an camp on cell otherwise.
*/
if (mac_timers->timer_get(t311)->is_running()) {
//
rrc_log->info("RRC Cell Selected: Sending connection reestablishment...\n");
con_restablish_cell_reselected();
state = RRC_STATE_CONNECTING;
connecting_timeout = 0;
} else if (connection_requested) {
connection_requested = false;
rrc_log->info("RRC Cell Selected: Sending connection request...\n");
send_con_request();
state = RRC_STATE_CONNECTING;
connecting_timeout = 0;
connection_requested = false;
} else {
rrc_log->info("RRC Cell Selected: Starting paging and going to IDLE...\n");
mac->pcch_start_rx();
@ -265,9 +274,9 @@ void rrc::run_thread() {
break;
case RRC_STATE_LEAVE_CONNECTED:
usleep(60000);
rrc_log->console("RRC IDLE\n");
rrc_log->info("Leaving RRC_CONNECTED state\n");
drb_up = false;
reestablishment_in_progress = false;
measurements.reset();
pdcp->reset();
rlc->reset();
@ -275,12 +284,14 @@ void rrc::run_thread() {
mac->reset();
set_phy_default();
set_mac_default();
mac->pcch_start_rx();
mac_timers->timer_get(t310)->stop();
mac_timers->timer_get(t311)->stop();
if (phy->sync_status()) {
// Instruct MAC to look for P-RNTI
mac->pcch_start_rx();
// Instruct PHY to measure serving cell for cell reselection
phy->meas_start(phy->get_current_earfcn(), phy->get_current_pci());
}
// Move to RRC_IDLE
state = RRC_STATE_IDLE;
@ -421,15 +432,24 @@ void rrc::plmn_search() {
plmn_select_timeout = 0;
}
/* This is the NAS interface. When NAS requests to select a PLMN we have to
* connect to either register or because there is pending higher layer traffic.
*/
void rrc::plmn_select(LIBLTE_RRC_PLMN_IDENTITY_STRUCT plmn_id) {
connection_requested = true;
plmn_select_rrc(plmn_id);
}
/* This is called by RRC only. In this case, we do not want to connect, just camp on the
* selected PLMN
*/
void rrc::plmn_select_rrc(LIBLTE_RRC_PLMN_IDENTITY_STRUCT plmn_id) {
// If already camping on the selected PLMN, select this cell
if (state == RRC_STATE_IDLE || state == RRC_STATE_CONNECTED || state == RRC_STATE_PLMN_SELECTION) {
if (phy->sync_status() && selected_plmn_id.mcc == plmn_id.mcc && selected_plmn_id.mnc == plmn_id.mnc) {
rrc_log->info("Already camping on selected PLMN, connecting...\n");
state = RRC_STATE_CELL_SELECTING;
select_cell_timeout = 0;
connection_requested = true;
} else {
rrc_log->info("PLMN Id=%s selected\n", plmn_id_to_string(plmn_id).c_str());
// Sort cells according to RSRP
@ -438,7 +458,6 @@ void rrc::plmn_select(LIBLTE_RRC_PLMN_IDENTITY_STRUCT plmn_id) {
last_selected_cell = -1;
select_cell_timeout = 0;
connection_requested = true;
state = RRC_STATE_CELL_SELECTING;
select_next_cell_in_plmn();
}
@ -477,7 +496,8 @@ void rrc::select_next_cell_in_plmn() {
}
}
}
rrc_log->info("No more known cells...\n");
rrc_log->info("No more known cells. Starting again\n");
last_selected_cell = -1;
}
void rrc::new_phy_meas(float rsrp, float rsrq, uint32_t tti, uint32_t earfcn, uint32_t pci) {
@ -603,11 +623,15 @@ rrc::cell_t* rrc::add_new_cell(uint32_t earfcn, srslte_cell_t phy_cell, float rs
// PHY indicates that has gone through all known EARFCN
void rrc::earfcn_end() {
rrc_log->debug("Finished searching cells in EARFCN set while in state %s\n", rrc_state_text[state]);
rrc_log->info("Finished searching cells in EARFCN set while in state %s\n", rrc_state_text[state]);
// If searching for PLMN, indicate NAS we scanned all frequencies
if (state == RRC_STATE_PLMN_SELECTION) {
nas->plmn_search_end();
} else if (state == RRC_STATE_CELL_SELECTING) {
select_cell_timeout = 0;
rrc_log->info("Starting cell search again\n");
phy->cell_search_start();
}
}
@ -631,7 +655,7 @@ void rrc::cell_reselection_eval(float rsrp, float rsrq)
{
// Intra-frequency cell-reselection criteria
if (get_srxlev(rsrp) > cell_resel_cfg.s_intrasearchP && rsrp > -80.0) {
if (get_srxlev(rsrp) > cell_resel_cfg.s_intrasearchP && rsrp > -70.0) {
// UE may not perform intra-frequency measurements.
phy->meas_reset();
// keep measuring serving cell
@ -864,8 +888,6 @@ void rrc::send_con_restablish_request() {
ul_ccch_msg.msg.rrc_con_reest_req.cause = LIBLTE_RRC_CON_REEST_REQ_CAUSE_OTHER_FAILURE;
liblte_rrc_pack_ul_ccch_msg(&ul_ccch_msg, (LIBLTE_BIT_MSG_STRUCT *) &bit_buf);
reestablishment_in_progress = true;
rrc_log->info("Initiating RRC Connection Reestablishment Procedure\n");
rrc_log->console("RRC Connection Reestablishment\n");
mac_timers->timer_get(t310)->stop();
@ -882,7 +904,6 @@ void rrc::send_con_restablish_request() {
// Actions following cell reselection 5.3.7.3
void rrc::con_restablish_cell_reselected()
{
reestablishment_in_progress = false;
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();
@ -1218,6 +1239,7 @@ void rrc::handle_sib2()
rrc_log->info("SIB2 received\n");
apply_sib2_configs(&current_cell->sib2);
}
void rrc::handle_sib3()

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