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osmocom-analog
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NMT: Assign traffic channel for outgoing and incoming calls 

This way the control channel stays available for other (idle) phones.

No more loss of coverage for other phones, when a call to a mobile is
made.

It is still possible to define a combined control+traffic channel.
(e.g. for single channel setup)
This commit is contained in:
Andreas Eversberg 2017-10-28 19:01:27 +02:00
parent 5c33b8824b
commit 87a21a285a
2 changed files with 82 additions and 18 deletions
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9
src/nmt/main.c
View File

@ -314,10 +314,11 @@ int main(int argc, char *argv[])
for (i = 0; i < num_kanal; i++)
audiodev[i] = "sdr";
num_audiodev = num_kanal;
/* set chan_type */
if (num_chan_type == 0) {
for (i = 0; i < num_kanal; i++)
chan_type[i] = CHAN_TYPE_CC_TC;
/* set channel types for more than 1 channel */
if (num_kanal > 1 && num_chan_type == 0) {
chan_type[0] = CHAN_TYPE_CC;
for (i = 1; i < num_kanal; i++)
chan_type[i] = CHAN_TYPE_TC;
num_chan_type = num_kanal;
}
if (num_supervisory == 0) {

91
src/nmt/nmt.c
View File

@ -241,6 +241,26 @@ static int dialstring2number(const char *dialstring, char *ms_country, char *ms_
return 0;
}
static inline int is_chan_class_cc(enum nmt_chan_type chan_type)
{
if (chan_type == CHAN_TYPE_CC
|| chan_type == CHAN_TYPE_CCA
|| chan_type == CHAN_TYPE_CCB)
return 1;
return 0;
}
static inline int is_chan_class_tc(enum nmt_chan_type chan_type)
{
if (chan_type == CHAN_TYPE_TC
|| chan_type == CHAN_TYPE_AC_TC
|| chan_type == CHAN_TYPE_CC_TC)
return 1;
return 0;
}
static void nmt_timeout(struct timer *timer);
/* Create transceiver instance and link to a list. */
@ -372,8 +392,8 @@ void nmt_check_channels(int __attribute__((unused)) nmt_system)
if (note)
PDEBUG(DNMT, DEBUG_NOTICE, "\n");
PDEBUG(DNMT, DEBUG_NOTICE, "*** Selected channel(s) can be used for calling only.\n");
PDEBUG(DNMT, DEBUG_NOTICE, "*** No call from the mobile phone is possible on this channel.\n");
PDEBUG(DNMT, DEBUG_NOTICE, "*** Use combined 'CC/TC' instead!\n");
PDEBUG(DNMT, DEBUG_NOTICE, "*** No call is possible on this channel.\n");
PDEBUG(DNMT, DEBUG_NOTICE, "*** Use at least one 'TC'!\n");
note = 1;
}
if (tc && !(cca || ccb)) {
@ -381,23 +401,23 @@ void nmt_check_channels(int __attribute__((unused)) nmt_system)
PDEBUG(DNMT, DEBUG_NOTICE, "\n");
PDEBUG(DNMT, DEBUG_NOTICE, "*** Selected channel(s) can be used for traffic only.\n");
PDEBUG(DNMT, DEBUG_NOTICE, "*** No call to the mobile phone is possible on this channel.\n");
PDEBUG(DNMT, DEBUG_NOTICE, "*** Use combined 'CC/TC' instead!\n");
PDEBUG(DNMT, DEBUG_NOTICE, "*** Use one 'CC'!\n");
note = 1;
}
if (cca && !ccb) {
if (note)
PDEBUG(DNMT, DEBUG_NOTICE, "\n");
PDEBUG(DNMT, DEBUG_NOTICE, "*** Selected channel(s) can be used for calling of MS type A only.\n");
PDEBUG(DNMT, DEBUG_NOTICE, "*** No call from the MS type B phone is possible on this channel.\n");
PDEBUG(DNMT, DEBUG_NOTICE, "*** Use combined 'CC' or 'CC/TC' instead!\n");
PDEBUG(DNMT, DEBUG_NOTICE, "*** No call to the MS type B phone is possible on this channel.\n");
PDEBUG(DNMT, DEBUG_NOTICE, "*** Use one 'CC' instead!\n");
note = 1;
}
if (!cca && ccb) {
if (note)
PDEBUG(DNMT, DEBUG_NOTICE, "\n");
PDEBUG(DNMT, DEBUG_NOTICE, "*** Selected channel(s) can be used for calling of MS type B only.\n");
PDEBUG(DNMT, DEBUG_NOTICE, "*** No call from the MS type A phone is possible on this channel.\n");
PDEBUG(DNMT, DEBUG_NOTICE, "*** Use combined 'CC' or 'CC/TC' instead!\n");
PDEBUG(DNMT, DEBUG_NOTICE, "*** No call to the MS type A phone is possible on this channel.\n");
PDEBUG(DNMT, DEBUG_NOTICE, "*** Use one 'CC' instead!\n");
note = 1;
}
}
@ -468,8 +488,7 @@ static void nmt_page(transaction_t *trans, int try)
/* page on all CC (CC/TC) */
for (sender = sender_head; sender; sender = sender->next) {
nmt = (nmt_t *)sender;
if (nmt->sysinfo.chan_type != CHAN_TYPE_CC
&& nmt->sysinfo.chan_type != CHAN_TYPE_CC_TC)
if (!is_chan_class_cc(nmt->sysinfo.chan_type))
continue;
/* page on all idle channels and on channels we previously paged */
if (nmt->state != STATE_IDLE && nmt->trans != trans)
@ -482,6 +501,26 @@ static void nmt_page(transaction_t *trans, int try)
}
}
static nmt_t *search_free_tc(void)
{
sender_t *sender;
nmt_t *nmt, *cc_tc = NULL;
for (sender = sender_head; sender; sender = sender->next) {
nmt = (nmt_t *) sender;
if (nmt->state != STATE_IDLE)
continue;
/* remember combined voice/control/paging channel as second alternative */
if (nmt->sysinfo.chan_type == CHAN_TYPE_CC_TC)
cc_tc = nmt;
else if (is_chan_class_tc(nmt->sysinfo.chan_type))
return nmt;
}
return cc_tc;
}
/*
* frame matching functions to check if channels is accessed correctly
*/
@ -1015,15 +1054,36 @@ static void rx_mt_paging(nmt_t *nmt, frame_t *frame)
static void tx_mt_channel(nmt_t *nmt, frame_t *frame)
{
transaction_t *trans = nmt->trans;
nmt_t *tc;
/* get free channel (after releasing all channels) */
tc = search_free_tc();
if (!tc) {
PDEBUG_CHAN(DNMT, DEBUG_NOTICE, "TC is not free anymore.\n");
PDEBUG(DNMT, DEBUG_INFO, "Release call towards network.\n");
call_up_release(trans->callref, CAUSE_NOCHANNEL);
trans->callref = 0;
nmt_release(nmt);
/* send idle for now, then continue with release */
tx_idle(nmt, frame);
return;
}
/* link trans and tc together, so we can continue with channel assignment */
PDEBUG_CHAN(DNMT, DEBUG_NOTICE, "Switching to TC channel #%d.\n", tc->sender.kanal);
nmt_new_state(nmt, STATE_IDLE);
tc->trans = trans;
trans->nmt = tc;
nmt_new_state(tc, STATE_MT_IDENT);
/* assign channel on 'nmt' to 'tc' */
frame->mt = NMT_MESSAGE_2b;
frame->channel_no = nmt_encode_channel(nmt->sysinfo.system, nmt->sender.kanal, nmt->sysinfo.ms_power);
frame->traffic_area = nmt_encode_traffic_area(nmt->sysinfo.system, nmt->sender.kanal, nmt->sysinfo.traffic_area);
frame->ms_country = nmt_digits2value(&trans->subscriber.country, 1);
frame->ms_number = nmt_digits2value(trans->subscriber.number, 6);
frame->tc_no = nmt_encode_tc(nmt->sysinfo.system, nmt->sender.kanal, nmt->sysinfo.ms_power);
frame->tc_no = nmt_encode_tc(tc->sysinfo.system, tc->sender.kanal, tc->sysinfo.ms_power);
PDEBUG_CHAN(DNMT, DEBUG_INFO, "Send channel activation to mobile.\n");
nmt_new_state(nmt, STATE_MT_IDENT);
}
static void tx_mt_ident(nmt_t *nmt, frame_t *frame)
@ -1686,9 +1746,8 @@ inval:
/* 3. check if all paging (calling) channels are busy, return NOCHANNEL */
for (sender = sender_head; sender; sender = sender->next) {
nmt = (nmt_t *) sender;
if (nmt->sysinfo.chan_type != CHAN_TYPE_CC
&& nmt->sysinfo.chan_type != CHAN_TYPE_CC_TC)
continue;
if (!is_chan_class_cc(nmt->sysinfo.chan_type))
continue;
if (nmt->state == STATE_IDLE)
break;
}
@ -1696,6 +1755,10 @@ inval:
PDEBUG(DNMT, DEBUG_NOTICE, "Outgoing call, but no free calling channel, rejecting!\n");
return -CAUSE_NOCHANNEL;
}
if (!search_free_tc()) {
PDEBUG(DNMT, DEBUG_NOTICE, "Outgoing call, but no free traffic channel, rejecting!\n");
return -CAUSE_NOCHANNEL;
}
PDEBUG(DNMT, DEBUG_INFO, "Call to mobile station, paging station id '%c%s'\n", subscr.country, subscr.number);