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srsRAN_4G
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nas: fix issue in which NAS wouldn't allow to attach once it failed

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the main issue was the plmn_selected variable. the solution
was to create a function to enter the deregistered state that resets the variable
and performs all other actions that need to be performed, like clearing
EPS bearers.

The patch also extends the SS to support AT commands to enable/disable
data services and now succesfully passes TC_9_2_2_1_7
master
Andre Puschmann 5 years ago
parent f14bb1e760
commit c5f52adfba
10 changed files with 112 additions and 45 deletions
Show Stats Download Patch File Download Diff File

4
lib/include/srslte/interfaces/ue_interfaces.h
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@ -194,7 +194,7 @@ class nas_interface_rrc
{
public:
typedef enum { BARRING_NONE = 0, BARRING_MO_DATA, BARRING_MO_SIGNALLING, BARRING_MT, BARRING_ALL } barring_t;
virtual void leave_connected() = 0;
virtual void left_rrc_connected() = 0;
virtual void set_barring(barring_t barring) = 0;
virtual void paging(srslte::s_tmsi_t* ue_identity) = 0;
virtual bool is_attached() = 0;
@ -214,7 +214,7 @@ class nas_interface_ue
{
public:
virtual void start_attach_request(srslte::proc_state_t* proc_result) = 0;
virtual bool detach_request() = 0;
virtual bool detach_request(const bool switch_off) = 0;
};
// PDCP interface for RRC

2
srsue/hdr/stack/ue_stack_lte.h
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@ -67,6 +67,8 @@ public:
int init(const stack_args_t& args_, srslte::logger* logger_, phy_interface_stack_lte* phy_, gw_interface_stack* gw_);
bool switch_on() final;
bool switch_off();
bool enable_data();
bool disable_data();
void stop();
bool get_metrics(stack_metrics_t* metrics);

7
srsue/hdr/stack/upper/nas.h
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@ -49,7 +49,7 @@ public:
emm_state_t get_state();
// RRC interface
void leave_connected();
void left_rrc_connected();
void paging(srslte::s_tmsi_t* ue_identity);
void set_barring(barring_t barring);
void write_pdu(uint32_t lcid, srslte::unique_byte_buffer_t pdu);
@ -61,7 +61,8 @@ public:
// UE interface
void start_attach_request(srslte::proc_state_t* result) final;
bool detach_request() final;
bool detach_request(const bool switch_off) final;
void enter_emm_deregistered();
void plmn_search_completed(rrc_interface_nas::found_plmn_t found_plmns[rrc_interface_nas::MAX_FOUND_PLMNS],
int nof_plmns) final;
@ -251,7 +252,7 @@ private:
bool outcome;
};
srslte::proc_outcome_t init(nas* nas_ptr_, srslte::unique_byte_buffer_t pdu);
srslte::proc_outcome_t init(nas* nas_ptr_, srslte::establishment_cause_t cause_, srslte::unique_byte_buffer_t pdu);
srslte::proc_outcome_t step() final;
static const char* name() { return "RRC Connect"; }

2
srsue/src/stack/rrc/rrc.cc
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@ -1299,7 +1299,7 @@ void rrc::leave_connected()
drb_up = false;
security_is_activated = false;
measurements.reset();
nas->leave_connected();
nas->left_rrc_connected();
pdcp->reset();
rlc->reset();
mac->reset();

16
srsue/src/stack/ue_stack_lte.cc
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@ -180,8 +180,8 @@ bool ue_stack_lte::switch_on()
bool ue_stack_lte::switch_off()
{
// generate detach request
nas.detach_request();
// generate detach request with switch-off flag
nas.detach_request(true);
// wait for max. 5s for it to be sent (according to TS 24.301 Sec 25.5.2.2)
const uint32_t RB_ID_SRB1 = 1;
@ -199,6 +199,18 @@ bool ue_stack_lte::switch_off()
return detach_sent;
}
bool ue_stack_lte::enable_data()
{
// perform attach request
return switch_on();
}
bool ue_stack_lte::disable_data()
{
// generate detach request
return nas.detach_request(false);
}
bool ue_stack_lte::get_metrics(stack_metrics_t* metrics)
{
mac.get_metrics(metrics->mac);

85
srsue/src/stack/upper/nas.cc
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@ -69,6 +69,7 @@ proc_outcome_t nas::plmn_search_proc::step()
if (ret.is_success()) {
return proc_outcome_t::success;
}
nas_ptr->enter_emm_deregistered();
return proc_outcome_t::error;
}
return proc_outcome_t::yield;
@ -114,7 +115,7 @@ proc_outcome_t nas::plmn_search_proc::trigger_event(const plmn_search_complete_t
nas_ptr->rrc->plmn_select(nas_ptr->current_plmn);
if (not nas_ptr->rrc_connector.launch(nas_ptr, nullptr)) {
if (not nas_ptr->rrc_connector.launch(nas_ptr, srslte::establishment_cause_t ::mo_data, nullptr)) {
Error("Unable to initiate RRC connection.\n");
return proc_outcome_t::error;
}
@ -123,7 +124,8 @@ proc_outcome_t nas::plmn_search_proc::trigger_event(const plmn_search_complete_t
return proc_outcome_t::yield;
}
proc_outcome_t nas::rrc_connect_proc::init(nas* nas_ptr_, srslte::unique_byte_buffer_t pdu)
proc_outcome_t
nas::rrc_connect_proc::init(nas* nas_ptr_, srslte::establishment_cause_t cause_, srslte::unique_byte_buffer_t pdu)
{
nas_ptr = nas_ptr_;
@ -155,14 +157,8 @@ proc_outcome_t nas::rrc_connect_proc::init(nas* nas_ptr_, srslte::unique_byte_bu
nas_ptr->rrc->set_ue_identity(s_tmsi);
}
establishment_cause_t establish_cause = establishment_cause_t::mo_sig;
if (nas_ptr->state == EMM_STATE_REGISTERED) {
// FIXME: only need to use MT_ACCESS for establishment after paging
establish_cause = establishment_cause_t::mt_access;
}
state = state_t::conn_req;
if (not nas_ptr->start_connection_request(establish_cause, std::move(pdu))) {
if (not nas_ptr->start_connection_request(cause_, std::move(pdu))) {
return proc_outcome_t::error;
}
@ -303,7 +299,6 @@ void nas::start_attach_request(srslte::proc_state_t* result)
nas_log->info("Attach Request\n");
switch (state) {
case EMM_STATE_DEREGISTERED:
// Search PLMN is not selected
if (!plmn_is_selected) {
nas_log->info("No PLMN selected. Starting PLMN Search...\n");
@ -318,6 +313,10 @@ void nas::start_attach_request(srslte::proc_state_t* result)
plmn_search_proc p = plmn_searcher.pop();
nas_log->info("Attach Request from PLMN Search %s\n", p.is_success() ? "finished successfully" : "failed");
*result = p.is_success() ? proc_state_t::success : proc_state_t::error;
// stay in this state if attach failed
if (not p.is_success()) {
enter_emm_deregistered();
}
return proc_outcome_t::success;
});
} else {
@ -331,7 +330,7 @@ void nas::start_attach_request(srslte::proc_state_t* result)
*result = proc_state_t::success;
} else {
nas_log->info("NAS is already registered but RRC disconnected. Connecting now...\n");
if (not rrc_connector.launch(this, nullptr)) {
if (not rrc_connector.launch(this, srslte::establishment_cause_t ::mo_data, nullptr)) {
nas_log->error("Cannot initiate concurrent rrc connection procedures\n");
*result = proc_state_t::error;
return;
@ -363,7 +362,8 @@ void nas::plmn_search_completed(rrc_interface_nas::found_plmn_t found_plmns[rrc_
plmn_searcher.trigger_event(plmn_search_proc::plmn_search_complete_t(found_plmns, nof_plmns));
}
bool nas::detach_request() {
bool nas::detach_request(const bool switch_off)
{
// attempt detach for 5s
nas_log->info("Detach Request\n");
@ -373,9 +373,7 @@ bool nas::detach_request() {
break;
case EMM_STATE_REGISTERED:
// send detach request
send_detach_request(true);
plmn_is_selected = false;
state = EMM_STATE_DEREGISTERED;
send_detach_request(switch_off);
break;
case EMM_STATE_DEREGISTERED_INITIATED:
// do nothing ..
@ -386,7 +384,18 @@ bool nas::detach_request() {
return false;
}
void nas::leave_connected()
void nas::enter_emm_deregistered()
{
// Deactivate EPS bearer according to Sec. 5.5.2.2.2
nas_log->info("Clearing EPS bearer context.\n");
eps_bearer.clear();
plmn_is_selected = false;
state = EMM_STATE_DEREGISTERED;
}
void nas::left_rrc_connected()
{
return;
}
@ -404,7 +413,7 @@ void nas::paging(s_tmsi_t* ue_identity)
nas_log->error("Cannot initiate concurrent RRC connection establishment procedures\n");
return;
}
if (not rrc_connector.launch(this, nullptr)) {
if (not rrc_connector.launch(this, srslte::establishment_cause_t ::mt_access, nullptr)) {
nas_log->error("Could not launch RRC Connect()\n");
return;
}
@ -417,7 +426,6 @@ void nas::paging(s_tmsi_t* ue_identity)
rrc->paging_completed(success);
return proc_outcome_t::success;
});
} else {
nas_log->warning("Received paging while in state %s\n", emm_state_text[state]);
}
@ -1034,7 +1042,7 @@ void nas::parse_attach_accept(uint32_t lcid, unique_byte_buffer_t pdu)
} else {
nas_log->info("Not handling attach type %u\n", attach_accept.eps_attach_result);
state = EMM_STATE_DEREGISTERED;
enter_emm_deregistered();
}
ctxt.rx_count++;
@ -1048,7 +1056,7 @@ void nas::parse_attach_reject(uint32_t lcid, unique_byte_buffer_t pdu)
liblte_mme_unpack_attach_reject_msg((LIBLTE_BYTE_MSG_STRUCT*)pdu.get(), &attach_rej);
nas_log->warning("Received Attach Reject. Cause= %02X\n", attach_rej.emm_cause);
nas_log->console("Received Attach Reject. Cause= %02X\n", attach_rej.emm_cause);
state = EMM_STATE_DEREGISTERED;
enter_emm_deregistered();
// FIXME: Command RRC to release?
}
@ -1101,7 +1109,7 @@ void nas::parse_authentication_request(uint32_t lcid, unique_byte_buffer_t pdu,
void nas::parse_authentication_reject(uint32_t lcid, unique_byte_buffer_t pdu)
{
nas_log->warning("Received Authentication Reject\n");
state = EMM_STATE_DEREGISTERED;
enter_emm_deregistered();
// FIXME: Command RRC to release?
}
@ -1256,8 +1264,7 @@ void nas::parse_service_reject(uint32_t lcid, unique_byte_buffer_t pdu)
// FIXME: handle NAS backoff-timers correctly
// Mark state as EMM-DEREGISTERED
state = EMM_STATE_DEREGISTERED;
enter_emm_deregistered();
// Reset security context
ctxt = {};
@ -1297,13 +1304,19 @@ void nas::parse_detach_request(uint32_t lcid, unique_byte_buffer_t pdu)
liblte_mme_unpack_detach_request_msg((LIBLTE_BYTE_MSG_STRUCT*)pdu.get(), &detach_request);
ctxt.rx_count++;
if (state == EMM_STATE_REGISTERED) {
nas_log->info("Received Detach request (type=%d)\n", detach_request.detach_type.type_of_detach);
state = EMM_STATE_DEREGISTERED;
// send accept
send_detach_accept();
} else {
nas_log->warning("Received detach request in invalid state (state=%d)\n", state);
switch (state) {
case EMM_STATE_DEREGISTERED_INITIATED:
nas_log->info("Received detach from network while performing UE initiated detach. Aborting UE detach.\n");
case EMM_STATE_REGISTERED:
nas_log->info("Received detach request (type=%d)\n", detach_request.detach_type.type_of_detach);
// send accept and leave state
send_detach_accept();
enter_emm_deregistered();
break;
default:
nas_log->warning("Received detach request in invalid state (%s)\n", emm_state_text[state]);
break;
}
}
@ -1651,7 +1664,7 @@ void nas::send_detach_request(bool switch_off)
detach_request.detach_type.type_of_detach = LIBLTE_MME_SO_FLAG_SWITCH_OFF;
} else {
detach_request.detach_type.switch_off = 0;
detach_request.detach_type.type_of_detach = LIBLTE_MME_SO_FLAG_NORMAL_DETACH;
detach_request.detach_type.type_of_detach = LIBLTE_MME_TOD_UL_EPS_DETACH;
}
// GUTI or IMSI detach
@ -1701,17 +1714,17 @@ void nas::send_detach_request(bool switch_off)
}
if (switch_off) {
// Deactivate EPS bearer according to Sec. 5.5.2.2.2
nas_log->info("Clearing EPS bearer context.\n");
eps_bearer.clear();
enter_emm_deregistered();
} else {
// we are expecting a response from the core
state = EMM_STATE_DEREGISTERED_INITIATED;
}
nas_log->info("Sending detach request\n");
if (rrc->is_connected()) {
rrc->write_sdu(std::move(pdu));
} else {
if (not rrc_connector.launch(this, std::move(pdu))) {
if (not rrc_connector.launch(this, establishment_cause_t::mo_sig, std::move(pdu))) {
nas_log->error("Failed to initiate RRC Connection Request\n");
}
callbacks.defer_proc(rrc_connector);

2
srsue/test/ttcn3/hdr/ttcn3_interfaces.h
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@ -34,6 +34,8 @@ public:
virtual void power_off_ue() = 0;
virtual void switch_on_ue() = 0;
virtual void switch_off_ue() = 0;
virtual void enable_data() = 0;
virtual void disable_data() = 0;
virtual void set_cell_config(std::string cell_name, uint32_t earfcn, srslte_cell_t cell, const float power) = 0;
virtual void set_cell_attenuation(std::string cell_name, const float attenuation) = 0;
virtual void add_bcch_pdu(srslte::unique_byte_buffer_t pdu) = 0;

16
srsue/test/ttcn3/hdr/ttcn3_syssim.h
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@ -244,6 +244,22 @@ public:
}
}
void enable_data()
{
if (ue) {
log.info("Enabling data services on UE ID=%d\n", run_id);
ue->enable_data();
}
}
void disable_data()
{
if (ue) {
log.info("Disabling data services on UE ID=%d\n", run_id);
ue->disable_data();
}
}
// Interface for PHY
void prach_indication(uint32_t preamble_index_, const uint32_t& cell_id)
{

4
srsue/test/ttcn3/hdr/ttcn3_ue.h
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@ -107,6 +107,10 @@ public:
bool switch_off() { return stack->switch_off(); }
bool enable_data() { return stack->enable_data(); }
bool disable_data() { return stack->disable_data(); }
// The interface for SYSSIM
void set_cell_map(lte_ttcn3_phy::cell_list_t phy_cell_map) { phy->set_cell_map(phy_cell_map); }

19
srsue/test/ttcn3/hdr/ttcn3_ut_interface.h
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@ -121,7 +121,7 @@ private:
log->error("Received unknown command: %s\n", mmi_cmd.GetString());
}
} else if (a.HasMember("AT")) {
log->error("AT commands not implemented.\n");
handle_at_command(document);
} else if (a.HasMember("TC_START")) {
log->info("Received TC_START command.\n");
const Value& cmd = a["TC_START"];
@ -164,6 +164,23 @@ private:
srslte_netsource_write(&net_source, (char*)buffer.GetString(), buffer.GetSize());
}
void handle_at_command(Document& document)
{
// We can assume the doc contains a AT CMD
const Value& at = document["Cmd"]["AT"];
// turn off data services
if (std::string(at.GetString()) == "AT+CGATT=0<CR>") {
log->info("Disabling data services\n");
syssim->disable_data();
} else if (std::string(at.GetString()) == "AT+CGATT=1<CR>") {
log->info("Enabling data services\n");
syssim->enable_data();
} else {
log->error("Not handling AT command %s\n", at.GetString());
}
}
syssim_interface* syssim = nullptr;
};

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