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osmo-bts-trx/scheduler: get rid of _sched_fcch_burst 

According to 3GPP 45.002, section 5.2.4, a frequency correction
burst is basically a sequence of zeros.  Since br->burst is already
zero-initialized, there is no need to maintain and memcpy() another
sequence of zeros into it. Just set the length.

Change-Id: Ic4f6d550010da5caf4bc471ff1e184c9fab30c6d
This commit is contained in:
Vadim Yanitskiy 2020-06-25 18:07:19 +07:00 committed by laforge
parent 2931fc337f
commit f3f0638066
3 changed files with 2 additions and 11 deletions
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1
include/osmo-bts/scheduler_backend.h
View File

@ -37,7 +37,6 @@ extern const struct trx_chan_desc trx_chan_desc[_TRX_CHAN_MAX];
extern const ubit_t _sched_tsc[8][26];
extern const ubit_t _sched_egprs_tsc[8][78];
extern const ubit_t _sched_fcch_burst[148];
extern const ubit_t _sched_sch_train[64];
struct msgb *_sched_dequeue_prim(struct l1sched_trx *l1t, int8_t tn, uint32_t fn,

9
src/common/scheduler.c
View File

@ -62,15 +62,6 @@ static const ubit_t dummy_burst[GSM_BURST_LEN] = {
0,0,0,
};
/*! \brief FCCH Burst (TS 05.02 Chapter 5.2.4) */
const ubit_t _sched_fcch_burst[GSM_BURST_LEN] = {
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
};
/*! \brief Training Sequences (TS 05.02 Chapter 5.2.3) */
const ubit_t _sched_tsc[8][26] = {
{ 0,0,1,0,0,1,0,1,1,1,0,0,0,0,1,0,0,0,1,0,0,1,0,1,1,1, },

3
src/osmo-bts-trx/sched_lchan_fcch_sch.c
View File

@ -40,7 +40,8 @@ int tx_fcch_fn(struct l1sched_trx *l1t, enum trx_chan_type chan,
{
LOGL1S(DL1P, LOGL_DEBUG, l1t, br->tn, chan, br->fn, "Transmitting FCCH\n");
memcpy(br->burst, _sched_fcch_burst, GSM_BURST_LEN);
/* A frequency correction burst is basically a sequence of zeros.
* Since br->burst is already zero-initialized, just set the length. */
br->burst_len = GSM_BURST_LEN;
return 0;