// (pat) This is started when SACCH is opened, and runs forever.
// The SACCHLogicalChannel are created by the SDCCHLogicalChannel and TCHFACCHLogicalChannel constructors.
void SACCHLogicalChannel::serviceLoop()
{
// run the loop
unsigned count = 0;
while (true) {
// Throttle back if not active.
if (!active()) {
//OBJLOG(DEBUG) << "SACCH sleeping";
// pat 5-2013: Vastly reducing the delays here and in L2LAPDm to try to reduce
// random failures of handover and channel reassignment from SDCCH to TCHF.
// Update: The further this sleep is reduced, the more reliable handover becomes.
// I left it at 4 for a while but handover still failed sometimes.
//sleepFrames(51);
#define USE_SEMAPHORE 0 // This does not work well - there appear to be hundreds of interrupts per second.
#if USE_SEMAPHORE
// (pat) Update: Getting rid of the sleep entirely. We will use a semaphore instead.
// Note that the semaphore call may return on signal, which is ok here.
cout << descriptiveString() << " WAIT" <<endl;
sem_wait(&mOpenSignal);
cout << descriptiveString() << " AFTER" <<endl;
#else
sleepFrames(2);
#endif
// A clever way to avoid the sleep above would be to wait for ESTABLISH primitive.
// (But which do you wait on - the tx or the rx queue?
continue; // paranoid, check again.
}
// Send any outbound messages. If the tx queue is empty send alternating SI5/6.
// (pat) FIXME: implement this!
if (const L3Message *l3msg = mTxQueue.readNoBlock()) {
SAPI_t sapi = SAPI0; // Determine sapi from PD. This is probably unnecessary, they are probably all SAPI=3
switch (l3msg->PD()) {
case L3RadioResourcePD: sapi = SAPI0; break;
case L3SMSPD: sapi = SAPI3; break;
default:
OBJLOG(ERR)<<"In SACCHLogicalChannel, unexpected"<<LOGVAR(l3msg->PD());
break;
}
L2LogicalChannel::l2sendm(*l3msg,GSM::DATA,sapi);
delete l3msg;
} else {
// Send alternating SI5/SI6.
// These L3Frames were created with the UNIT_DATA primivitive.
OBJLOG(DEBUG) << "sending SI5/6 on SACCH";
if (count%2) L2LogicalChannel::l2sendf(gBTS.SI5Frame());
else L2LogicalChannel::l2sendf(gBTS.SI6Frame());
count++;
}
// Receive inbound messages.
// This read loop flushes stray reports quickly.
while (true) {
OBJLOG(DEBUG) << "polling SACCH for inbound messages";
bool nothing = true;
// Process SAP0 -- RR Measurement reports
if (L3Frame *rrFrame = L2LogicalChannel::l2recv(0,0)) {
nothing=false;
bool isMeasurementReport = rrFrame->isData()
&& rrFrame->PD() == L3RadioResourcePD && rrFrame->MTI() == L3RRMessage::MeasurementReport;
if (isMeasurementReport) {
// Neither of these 'ifs' should fail, but be safe.
if (const L3Message* rrMessage = parseSACCHMessage(rrFrame)) {
if (const L3MeasurementReport* measurement = dynamic_cast<typeof(measurement)>(rrMessage)) {
OBJLOG(DEBUG) << "SACCH measurement report " << mMeasurementResults;
mMeasurementResults = measurement->results();
if (mMeasurementResults.MEAS_VALID() == 0) {
addSelfRxLev(mMeasurementResults.RXLEV_SUB_SERVING_CELL_dBm());
}
// Add the measurement results to the table
// Note that the typeAndOffset of a SACCH match the host channel.
gPhysStatus.setPhysical(this, mMeasurementResults);
// Check for handover requirement.
// (pat) TODO: This may block while waiting for a reply from a Peer BTS.
Control::HandoverDetermination(mMeasurementResults,mAverageRXLEV_SUB_SERVICING_CELL,this);
}
delete rrMessage;
}
delete rrFrame;
} else {
// Send it off to Layer 3. Who knows what might show up here.
hostChan()->chanEnqueueFrame(rrFrame);
}
}
#if 0
L3Message* rrMessage = parseSACCHMessage(rrFrame);
delete rrFrame;
if (rrMessage) {
L3MeasurementReport* measurement = dynamic_cast<L3MeasurementReport*>(rrMessage);
if (measurement) {
mMeasurementResults = measurement->results();
OBJLOG(DEBUG) << "SACCH measurement report " << mMeasurementResults;
// Add the measurement results to the table
// Note that the typeAndOffset of a SACCH match the host channel.
gPhysStatus.setPhysical(this, mMeasurementResults);
// Check for handover requirement.
// (pat) TODO: This may block while waiting for a reply from a Peer BTS.
Control::HandoverDetermination(mMeasurementResults,this);
delete rrMessage;
} else {
if (Control::l3rewrite()) {
OBJLOG(DEBUG) << "chanEnqueuel3msg:"<<rrMessage;
hostChan()->chanEnqueuel3msg(rrMessage);
} else {
OBJLOG(NOTICE) << "SACCH SAP0 sent unaticipated message " << rrMessage;
delete rrMessage;
}
}
}
#endif
// Process SAP3 -- SMS
L3Frame *smsFrame = L2LogicalChannel::l2recv(0,3);
if (smsFrame) {
nothing=false;
OBJLOG(DEBUG) <<"received SMS frame:"<<smsFrame;
// The SACCH messages are polled from by the single L3LogicalChannel thread that handles this MS.
//if (smsFrame) { Control::gCSL3StateMachine.csl3Write(new Control::GenericL3Msg(smsFrame,this)); }
//L3Message *smsMessage = parseSACCHMessage(smsFrame);
//OBJLOG(DEBUG) <<"parsed SMS message:"<<smsMessage;
//delete smsFrame;
hostChan()->chanEnqueueFrame(smsFrame);
}
// Did we get anything from the phone?
// If not, we may have lost contact. Bump the RSSI to induce more power
if (nothing) RSSIBumpDown(gConfig.getNum("Control.SACCHTimeout.BumpDown"));
// Nothing happened?
if (nothing) break;
}
}
}
void SACCHLogicalChannel::serviceLoop()
{
// run the loop
unsigned count = 0;
while (true) {
// Throttle back if not active.
if (!active()) {
OBJLOG(DEBUG) << "SACCH sleeping";
sleepFrames(51);
continue;
}
// TODO SMS -- Check to see if the tx queues are empty. If so, send SI5/6,
// otherwise sleep and continue;
// Send alternating SI5/SI6.
OBJLOG(DEBUG) << "sending SI5/6 on SACCH";
if (count%2) LogicalChannel::send(gBTS.SI5Frame());
else LogicalChannel::send(gBTS.SI6Frame());
count++;
// Receive inbound messages.
// This read loop flushes stray reports quickly.
while (true) {
OBJLOG(DEBUG) << "polling SACCH for inbound messages";
bool nothing = true;
// Process SAP0 -- RR Measurement reports
L3Frame *rrFrame = LogicalChannel::recv(0,0);
if (rrFrame) nothing=false;
L3Message* rrMessage = processSACCHMessage(rrFrame);
delete rrFrame;
if (rrMessage) {
L3MeasurementReport* measurement = dynamic_cast<L3MeasurementReport*>(rrMessage);
if (measurement) {
mMeasurementResults = measurement->results();
OBJLOG(DEBUG) << "SACCH measurement report " << mMeasurementResults;
// Add the measurement results to the table
// Note that the typeAndOffset of a SACCH match the host channel.
gPhysStatus.setPhysical(this, mMeasurementResults);
} else {
OBJLOG(NOTICE) << "SACCH SAP0 sent unaticipated message " << rrMessage;
}
delete rrMessage;
}
// Process SAP3 -- SMS
L3Frame *smsFrame = LogicalChannel::recv(0,3);
if (smsFrame) nothing=false;
L3Message* smsMessage = processSACCHMessage(smsFrame);
delete smsFrame;
if (smsMessage) {
const SMS::CPData* cpData = dynamic_cast<const SMS::CPData*>(smsMessage);
if (cpData) {
OBJLOG(INFO) << "SMS CPDU " << *cpData;
Control::TransactionEntry *transaction = gTransactionTable.find(this);
try {
if (transaction) {
Control::InCallMOSMSController(cpData,transaction,this);
} else {
OBJLOG(WARNING) << "in-call MOSMS CP-DATA with no corresponding transaction";
}
} catch (Control::ControlLayerException e) {
//LogicalChannel::send(RELEASE,3);
gTransactionTable.remove(e.transactionID());
}
} else {
OBJLOG(NOTICE) << "SACCH SAP3 sent unaticipated message " << rrMessage;
}
delete smsMessage;
}
// Anything from the SIP side?
// MTSMS (delivery from SIP to the MS)
Control::TransactionEntry *sipTransaction = mTransactionFIFO.readNoBlock();
if (sipTransaction) {
OBJLOG(INFO) << "SIP-side transaction: " << sipTransaction;
assert(sipTransaction->service() == L3CMServiceType::MobileTerminatedShortMessage);
try {
Control::MTSMSController(sipTransaction,this);
} catch (Control::ControlLayerException e) {
//LogicalChannel::send(RELEASE,3);
gTransactionTable.remove(e.transactionID());
}
}
// Nothing happened?
if (nothing) break;
}
}
}
void SACCHLogicalChannel::serviceLoop()
{
// run the loop
unsigned count = 0;
while (true) {
// Throttle back if not active.
if (!active()) {
//OBJLOG(DEBUG) << "SACCH sleeping";
sleepFrames(51);
continue;
}
// TODO SMS -- Check to see if the tx queues are empty. If so, send SI5/6,
// otherwise sleep and continue;
// Send alternating SI5/SI6.
// These L3Frames were created with the UNIT_DATA primivitive.
OBJLOG(DEBUG) << "sending SI5/6 on SACCH";
// To be thread safe make a copy with the system information locked
L3Frame frame;
gBTS.infoLock().lock();
if (count%2) {
gBTS.regenerateSI5();
frame = gBTS.SI5Frame();
}
else frame = gBTS.SI6Frame();
gBTS.infoLock().unlock();
LogicalChannel::send(frame);
count++;
// Receive inbound messages.
// This read loop flushes stray reports quickly.
while (true) {
OBJLOG(DEBUG) << "polling SACCH for inbound messages";
bool nothing = true;
// Process SAP0 -- RR Measurement reports
L3Frame *rrFrame = LogicalChannel::recv(0,0);
if (rrFrame) nothing=false;
L3Message* rrMessage = processSACCHMessage(rrFrame);
delete rrFrame;
if (rrMessage) {
L3MeasurementReport* measurement = dynamic_cast<L3MeasurementReport*>(rrMessage);
if (measurement) {
mMeasurementResults = measurement->results();
OBJLOG(DEBUG) << "SACCH measurement report " << mMeasurementResults;
// Add the measurement results to the table
// Note that the typeAndOffset of a SACCH match the host channel.
gPhysStatus.setPhysical(this, mMeasurementResults);
// Check for handover requirement.
if (mMeasurementHoldOff.passed()) {
mMeasurementHoldOff.future(gConfig.getNum("GSM.Handover.RepeatHoldoff"));
Control::HandoverDetermination(mMeasurementResults,this);
}
} else {
OBJLOG(NOTICE) << "SACCH SAP0 sent unanticipated message " << rrMessage;
}
delete rrMessage;
}
// Process SAP3 -- SMS
L3Frame *smsFrame = LogicalChannel::recv(0,3);
if (smsFrame) {
nothing=false;
switch (smsFrame->primitive()) {
case ESTABLISH:
{
int id = gConnMap.find(this);
if (id >= 0)
gSigConn.send(Connection::SigEstablishSAPI,0x83,id);
else
LOG(ERR) << "SAP3 established on unmapped channel " << *this;
}
break;
case DATA:
case UNIT_DATA:
{
int id = gConnMap.find(this);
if (id >= 0)
gSigConn.send(0x83,id,smsFrame);
else
LOG(ERR) << "SAP3 data on unmapped channel " << *this;
}
break;
default:
LOG(INFO) << "non-data primitive " << smsFrame->primitive();
}
delete smsFrame;
}
// Did we get anything from the phone?
// If not, we may have lost contact. Bump the RSSI to induce more power
//if (nothing) RSSIBumpDown(gConfig.getNum("Control.SACCHTimeout.BumpDown"));
// Nothing happened?
if (nothing) break;
}
}
}