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@gmail.com>
Related: OS#1548
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 */