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abis_rsl: add spec ref for frame number calculation 

The frame number calculation in rsl_rx_pchan_rqd() is done using a
specific formula. Lets add a spec reference and also restructure the
code a bit.

Change-Id: I60500c8694dbc2e6e2c4bbffd4ff7057bbc324e6
This commit is contained in:
Philipp Maier 2023-01-06 16:20:27 +01:00
parent 22cbe9a332
commit 71a4f1302b
1 changed files with 3 additions and 1 deletions
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4
src/osmo-bsc/abis_rsl.c
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@ -1814,11 +1814,13 @@ static int rsl_rx_pchan_rqd(struct chan_rqd *rqd)
return -EINVAL;
} else {
is_11bit = 0;
rqd_ta = rqd->ta;
/* See also 3GPP TS 04.08, section 10.5.2.38 and 3GPP TS 08.58, section 9.3.8 */
t1 = rqd->ref.t1;
t2 = rqd->ref.t2;
t3 = rqd->ref.t3_low | (rqd->ref.t3_high << 3);
fn = (51 * ((t3-t2) % 26) + t3 + 51 * 26 * t1);
rqd_ta = rqd->ta;
}
return pcu_tx_rach_ind(rqd->bts, rqd_ta, rqd->ref.ra, fn, is_11bit,