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osmo-bts
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measurement.c: higher-precision TA/TOA math 

Change-Id: I0dc8e78545465dfc5c93691a49b86b6b8b56b432
This commit is contained in:
Harald Welte 2018-02-21 12:41:02 +01:00
parent d5bbd8ccf7
commit c092f4e1de
3 changed files with 8 additions and 8 deletions
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4
include/osmo-bts/gsm_data_shared.h
View File

@ -165,8 +165,8 @@ enum gsm_lchan_state {
struct bts_ul_meas {
/* BER in units of 0.01%: 10.000 == 100% ber, 0 == 0% ber */
uint16_t ber10k;
/* timing advance offset (in quarter bits) */
int16_t ta_offs_qbits;
/* timing advance offset (in 1/256 bits) */
int16_t ta_offs_256bits;
/* C/I ratio in dB */
float c_i;
/* flags */

2
src/common/l1sap.c
View File

@ -522,7 +522,7 @@ static int l1sap_info_meas_ind(struct gsm_bts_trx *trx,
return 0;
memset(&ulm, 0, sizeof(ulm));
ulm.ta_offs_qbits = info_meas_ind->ta_offs_qbits;
ulm.ta_offs_256bits = info_meas_ind->ta_offs_qbits*(256/4);
ulm.ber10k = info_meas_ind->ber10k;
ulm.inv_rssi = info_meas_ind->inv_rssi;
ulm.is_sub = info_meas_ind->is_sub;

10
src/common/measurement.c
View File

@ -342,7 +342,7 @@ int lchan_meas_check_compute(struct gsm_lchan *lchan, uint32_t fn)
uint32_t irssi_full_sum = 0;
uint32_t ber_sub_sum = 0;
uint32_t irssi_sub_sum = 0;
int32_t taqb_sum = 0;
int32_t ta256b_sum = 0;
unsigned int num_meas_sub = 0;
int i;
@ -362,7 +362,7 @@ int lchan_meas_check_compute(struct gsm_lchan *lchan, uint32_t fn)
ber_full_sum += m->ber10k;
irssi_full_sum += m->inv_rssi;
taqb_sum += m->ta_offs_qbits;
ta256b_sum += m->ta_offs_256bits;
if (m->is_sub) {
num_meas_sub++;
@ -374,7 +374,7 @@ int lchan_meas_check_compute(struct gsm_lchan *lchan, uint32_t fn)
/* step 2: divide */
ber_full_sum = ber_full_sum / lchan->meas.num_ul_meas;
irssi_full_sum = irssi_full_sum / lchan->meas.num_ul_meas;
taqb_sum = taqb_sum / lchan->meas.num_ul_meas;
ta256b_sum = ta256b_sum / lchan->meas.num_ul_meas;
if (num_meas_sub) {
ber_sub_sum = ber_sub_sum / num_meas_sub;
@ -387,9 +387,9 @@ int lchan_meas_check_compute(struct gsm_lchan *lchan, uint32_t fn)
irssi_sub_sum = 120; /* -120 dBm */
}
LOGP(DMEAS, LOGL_INFO, "%s Computed TA(% 4dqb) BER-FULL(%2u.%02u%%), RSSI-FULL(-%3udBm), "
LOGP(DMEAS, LOGL_INFO, "%s Computed TA256(% 4d) BER-FULL(%2u.%02u%%), RSSI-FULL(-%3udBm), "
"BER-SUB(%2u.%02u%%), RSSI-SUB(-%3udBm)\n", gsm_lchan_name(lchan),
taqb_sum, ber_full_sum/100,
ta256b_sum, ber_full_sum/100,
ber_full_sum%100, irssi_full_sum, ber_sub_sum/100, ber_sub_sum%100,
irssi_sub_sum);