void Clock::clockSet(const Time& when)
{
ScopedLock lock(mLock);
mBaseTime = Timeval(0);
mBaseFN = when.FN();
isValid = true;
}
void Clock::set(const Time& when)
{
mLock.lock();
mBaseTime = Timeval(0);
mBaseFN = when.FN();
mLock.unlock();
}
void PDCHL1Downlink::bugFixIdleFrame()
{
// DEBUG: We are only using this function to fix this problem for now.
if (gFixIdleFrame) {
// For this debug purpose, the mssage is sent on the next frame
// TODO: debug purpose only! This only works for one channel!
//Time tnext(gBSNNext.FN());
//gBTS.clock().wait(tnext);
}
// Did we make it in time?
{
Time tnow = gBTS.time();
int fn = tnow.FN();
int mfn = (fn / 13); // how many 13-multiframes
int rem = (fn - (mfn*13)); // how many blocks within the last multiframe.
int tbsn = mfn * 3 + ((rem==12) ? 2 : (rem/4));
GPRSLOG(2) <<"idleframe"<<LOGVAR(fn)<<LOGVAR(tbsn)<<LOGVAR(rem);
}
/***
if (mchIdleFrame.size() == 0) {
RLCMsgPacketDownlinkDummyControlBlock *dummymsg = new RLCMsgPacketDownlinkDummyControlBlock();
mchIdleFrame.set(BitVector(RLCBlockSizeInBits[ChannelCodingCS1]));
dummymsg->write(mchIdleFrame);
delete dummymsg;
}
send1Frame(mchIdleFrame,ChannelCodingCS1,true);
***/
}
void Clock::wait(const Time& when) const
{
int32_t now = FN();
int32_t target = when.FN();
int32_t delta = FNDelta(target,now);
if (delta<1) return;
static const int32_t maxSleep = 51*26;
if (delta>maxSleep) delta=maxSleep;
sleepFrames(delta);
}
// Return true if the CCCH frame was used.
bool CCCHLogicalChannel::processRaches()
{
while (RachInfo *rach = gRachq.readNoBlock())
{
Time now = gBTS.time();
int age = now - rach->mWhen; // The result is number of frames and could be negative.
if (age>sMaxAge) {
LOG(WARNING) << "ignoring RACH burst with age " << age;
if (rach->mChan) {
LOG(INFO) << "BTS congestion: unable to process RACH for pre-allocated channel within expiration time";
rach->mChan->l2sendp(L3_HARDRELEASE_REQUEST); // (pat) added 9-6-2013
}
delete rach;
continue; // Did not use the CCCH frame yet.
}
ChannelType chtype = decodeChannelNeeded(rach->mRA);
LOG(DEBUG) <<LOGVAR(*rach) <<LOGVAR(chtype) <<LOGVAR(mCcchGroup);
if (chtype == PSingleBlock1PhaseType || chtype == PSingleBlock2PhaseType) {
assert(rach->mChan == NULL);
if (0 == gConfig.getNum("GPRS.Enable")) {
// GPRS service request when the beacon advertises no beacon support.
// This was a spurious RACH message or a stupid handset. Ignore it.
assert(rach->mChan == NULL);
delete rach;
continue;
}
// Regardless of the type of GPRS request, we will send a single-block uplink,
// which the MS will (most likely) use to send us a PacketResourceRequest.
// First request a single-block reservation from GPRS. If GPRS resources are busy,
// this will return NULL and we will send reject the RACH.
L3ImmediateAssignment *iap = GPRS::makeSingleBlockImmediateAssign(rach, mCcchNextWriteTime.FN() + 4);
if (iap) {
L2LogicalChannelBase::l2sendm(*iap,L3_UNIT_DATA);
delete iap;
delete rach;
} else {
}
return true; // We processed this rach and used the CCCH, one way or another.
}
// L2LogicalChannel *LCH;
// if (chtype == TCHFType) {
// // FIXME: This blocks at L2LAPDm::sendIdle!
// LCH = gBTS.getTCH();
// } else if (chtype == SDCCHType) {
// // We may reserve some SDCCH for CC and SMS.
// if (requestingLUR(rach->mRA)) {
// int SDCCHAvailable = gBTS.SDCCHAvailable();
// int SDCCHReserve = gConfig.getNum("GSM.Channels.SDCCHReserve");
// if (requestingLUR(rach->mRA) && SDCCHAvailable <= SDCCHReserve) {
// // (pat 2-2014) Changed this message and downgraded from CRIT.
// LOG(CRIT) << "LUR [Location Update Request] congestion, insufficient "<<LOGVAR(SDCCHAvailable) << " <= " <<LOGVAR(SDCCHReserve);
// goto failure;
// }
// }
//
// LCH = gBTS.getSDCCH();
// } else {
// LOG(NOTICE) << "RACH burst for unsupported service RA=" << rach->mRA;
// LCH = gBTS.getSDCCH(); // Try anyway.
// }
//
//
// // Nothing available?
// if (!LCH) {
// failure:
#if 0
// return false;
#endif
// }
if (! rach->mChan) {
delete rach;
continue;
}
// Success. Send an ImmediateAssignment.
int initialTA = rach->initialTA();
assert(initialTA >= 0 && initialTA <= 62); // enforced by AccessGrantResponder.
//LCH->l1InitPhy(rach->RSSI(),initialTA,gBTS.clock().systime(rach->mWhen.FN()));
gReports.incr("OpenBTS.GSM.RR.RACH.TA.Accepted",(int)(initialTA));
L2LogicalChannel *LCH = rach->mChan;
// TODO: Update T3101.
L3ImmediateAssignment assign(
L3RequestReference(rach->mRA,rach->mWhen),
LCH->channelDescription(),
L3TimingAdvance(initialTA)
);
//assign.setStartFrame(rach->mReadyTime.FN() + 104);
if (0) { // This was for debugging. Adding this delay made the layer1 connection reliable.
// Delay the channel assignment until the SACCH is known to be transmitting...
Time sacchStart = LCH->getSACCH()->getNextWriteTime();
now = gBTS.time(); // Must update this because getTCH blocked.
int msecsDelay = ((sacchStart - now.FN()).FN() * gFrameMicroseconds) / 1000;
// Add an extra gratuitous 250ms delay for testing.
// msecsDelay += 250;
if (msecsDelay < 0) { msecsDelay = 0; }
if (msecsDelay) {
LCH->addT3101(msecsDelay);
//assign.setStartFrame(now.FN() + (1000 * msecsDelay) / gFrameMicroseconds);
usleep(msecsDelay * 1000);
}
LOG(INFO) << "sending L3ImmediateAssignment " << LCH->descriptiveString() <<LOGVAR(msecsDelay) <<" " <<assign;
}
L2LogicalChannelBase::l2sendm(assign,L3_UNIT_DATA);
delete rach;
return true; // We used this CCCH.
}
return false; // CCCH frame not used.
}
