fixeria has uploaded this change for review. (
https://gerrit.osmocom.org/c/osmo-bts/+/15658
Change subject: common/l1sap: increase ToA precision for packet Access Bursts
......................................................................
common/l1sap: increase ToA precision for packet Access Bursts
QTA is a Timing Advance value in units of 1/4 of a symbol. Let's
use ToA256 (1/256 of a symbol) field of L1SAP RACH.ind as a base
for QTA calculation in order to achieve better precision.
Change-Id: I6e6fa7985c430a9bdbd12af2a8b2a5a66f11a41c
---
M src/common/l1sap.c
1 file changed, 2 insertions(+), 1 deletion(-)
git pull ssh://gerrit.osmocom.org:29418/osmo-bts refs/changes/58/15658/1
diff --git a/src/common/l1sap.c b/src/common/l1sap.c
index 0409e2e..c6dfee2 100644
--- a/src/common/l1sap.c
+++ b/src/common/l1sap.c
@@ -1358,7 +1358,8 @@
LOGPFN(DL1P, LOGL_INFO, rach_ind->fn, "RACH for packet access
(toa=%d, ra=%d)\n",
rach_ind->acc_delay, rach_ind->ra);
- pcu_tx_rach_ind(bts, rach_ind->acc_delay << 2,
+ /* QTA: Timing Advance in units of 1/4 of a symbol */
+ pcu_tx_rach_ind(bts, rach_ind->acc_delay_256bits >> 6,
rach_ind->ra, rach_ind->fn, rach_ind->is_11bit,
rach_ind->burst_type, PCU_IF_SAPI_RACH);
return 0;
--
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Gerrit-Project: osmo-bts
Gerrit-Branch: master
Gerrit-Change-Id: I6e6fa7985c430a9bdbd12af2a8b2a5a66f11a41c
Gerrit-Change-Number: 15658
Gerrit-PatchSet: 1
Gerrit-Owner: fixeria <[email protected]>
Gerrit-MessageType: newchange
