Change in osmo-pcu[master]: fix egprs_mslot_class_from_ra(): multislot class may not be present

[laforge]

laforge has submitted this change. ( https://gerrit.osmocom.org/c/osmo-pcu/+/18157 )

Change subject: fix egprs_mslot_class_from_ra(): multislot class may not be present
......................................................................

fix egprs_mslot_class_from_ra(): multislot class may not be present

For more details, see 3GPP TS 44.060, table 11.2.5a.2.

Change-Id: Iba0466b29afd26cff317ed4fb6749f8a3079f16a
Signed-off-by: Vadim Yanitskiy <axilirator at gmail.com>
Related: OS#1548
---
M src/bts.cpp
1 file changed, 2 insertions(+), 1 deletion(-)

Approvals:
  laforge: Looks good to me, approved
  pespin: Looks good to me, but someone else must approve
  Jenkins Builder: Verified



diff --git a/src/bts.cpp b/src/bts.cpp
index 6578e06..1d073aa 100644
--- a/src/bts.cpp
+++ b/src/bts.cpp
@@ -675,7 +675,8 @@
  */
 static inline uint8_t egprs_mslot_class_from_ra(uint16_t ra, bool is_11bit)
 {
-	if (is_11bit)
+	/* EGPRS multislot class is only present in One Phase Access Request */
+	if (is_11bit && (ra >> 10) == 0x00) /* .0xx xxx. .... */
 		return ((ra & 0x3e0) >> 5) + 1;
 
 	/* set EGPRS multislot class to 0 for 8-bit RACH, since we don't know it yet */

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Gerrit-Project: osmo-pcu
Gerrit-Branch: master
Gerrit-Change-Id: Iba0466b29afd26cff317ed4fb6749f8a3079f16a
Gerrit-Change-Number: 18157
Gerrit-PatchSet: 4
Gerrit-Owner: fixeria <axilirator at gmail.com>
Gerrit-Reviewer: Jenkins Builder
Gerrit-Reviewer: fixeria <axilirator at gmail.com>
Gerrit-Reviewer: laforge <laforge at osmocom.org>
Gerrit-Reviewer: pespin <pespin at sysmocom.de>
Gerrit-MessageType: merged
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