diff --git a/src/gprs_rlcmac_ts_alloc.cpp b/src/gprs_rlcmac_ts_alloc.cpp
index 0169d49..0085f81 100644
--- a/src/gprs_rlcmac_ts_alloc.cpp
+++ b/src/gprs_rlcmac_ts_alloc.cpp
@@ -548,7 +548,8 @@
 				c = 32 - pdch->num_reserved(GPRS_RLCMAC_DL_TBF);
 				capacity += c;
 			}
-			if (tx_window & (1 << ts)) {
+			/* Only consider common slots for UL */
+			if (tx_window & rx_window & (1 << ts)) {
 				c = 32 - pdch->num_reserved(GPRS_RLCMAC_UL_TBF);
 				capacity += c;
 			}
diff --git a/tests/alloc/AllocTest.cpp b/tests/alloc/AllocTest.cpp
index 187b88a..b804aab 100644
--- a/tests/alloc/AllocTest.cpp
+++ b/tests/alloc/AllocTest.cpp
@@ -567,11 +567,11 @@
 	test_successive_allocation(alloc_algorithm_b, 10, 10, TEST_MODE_UL_AND_DL,
 		32, "algorithm B class 10 (UL and DL)");
 	test_successive_allocation(alloc_algorithm_b, 12, 12, TEST_MODE_UL_AND_DL,
-		29, "algorithm B class 12 (UL and DL)");
+		32, "algorithm B class 12 (UL and DL)");
 	test_successive_allocation(alloc_algorithm_b, 1, 12, TEST_MODE_UL_AND_DL,
-		31, "algorithm B class 1-12 (UL and DL)");
+		32, "algorithm B class 1-12 (UL and DL)");
 	test_successive_allocation(alloc_algorithm_b, 1, 29, TEST_MODE_UL_AND_DL,
-		24, "algorithm B class 1-29 (UL and DL)");
+		31, "algorithm B class 1-29 (UL and DL)");
 
 	test_successive_allocation(alloc_algorithm_a, 1, 1, TEST_MODE_DL_AND_UL,
 		32, "algorithm A (DL and UL)");
diff --git a/tests/alloc/AllocTest.err b/tests/alloc/AllocTest.err
index 58a57d2..d38a1ce 100644
--- a/tests/alloc/AllocTest.err
+++ b/tests/alloc/AllocTest.err
@@ -4,8 +4,8 @@
 - Failed to allocate a TS, no USF available
 No TFI available.
 No TFI available.
-No USF available
-No USF available
+No TFI available.
+No TFI available.
 No USF available
 No TFI available.
 No USF available
diff --git a/tests/alloc/AllocTest.ok b/tests/alloc/AllocTest.ok
index 4b6aad9..f8fb485 100644
--- a/tests/alloc/AllocTest.ok
+++ b/tests/alloc/AllocTest.ok
@@ -8659,34 +8659,37 @@
 Going to test assignment with many TBF, algorithm B class 12 (UL and DL)
  TBF[0] class 12 reserves ...DDCD.
  TBF[1] class 12 reserves .....DCD
- TBF[2] class 12 reserves ...CD...
+ TBF[2] class 12 reserves ...DCD..
  TBF[3] class 12 reserves .....DDC
- TBF[4] class 12 reserves ...DC...
+ TBF[4] class 12 reserves ...DCD..
  TBF[5] class 12 reserves .....DCD
- TBF[6] class 12 reserves ...CD...
+ TBF[6] class 12 reserves ...DDC..
  TBF[7] class 12 reserves .....DDC
- TBF[8] class 12 reserves ...DC...
+ TBF[8] class 12 reserves ...DCD..
  TBF[9] class 12 reserves .....DCD
- TBF[10] class 12 reserves ...CD...
+ TBF[10] class 12 reserves ...DDC..
  TBF[11] class 12 reserves .....DDC
- TBF[12] class 12 reserves ...DC...
+ TBF[12] class 12 reserves ...DCD..
  TBF[13] class 12 reserves .....DCD
- TBF[14] class 12 reserves ...CD...
+ TBF[14] class 12 reserves ...DDC..
  TBF[15] class 12 reserves .....DDC
- TBF[16] class 12 reserves ...DC...
+ TBF[16] class 12 reserves ...DCD..
  TBF[17] class 12 reserves .....DCD
- TBF[18] class 12 reserves ...CD...
+ TBF[18] class 12 reserves ...DDC..
  TBF[19] class 12 reserves .....DDC
- TBF[20] class 12 reserves ...DC...
+ TBF[20] class 12 reserves ...DCD..
  TBF[21] class 12 reserves .....DCD
  TBF[22] class 12 reserves ...CD...
  TBF[23] class 12 reserves .....DDC
- TBF[24] class 12 reserves ...DC...
- TBF[25] class 12 reserves .....DCD
- TBF[26] class 12 reserves ...CD...
- TBF[27] class 12 reserves .....DDC
- TBF[28] class 12 reserves ...DC...
-  Successfully allocated 29 UL TBFs
+ TBF[24] class 12 reserves ...CD...
+ TBF[25] class 12 reserves ...CD...
+ TBF[26] class 12 reserves .....DCD
+ TBF[27] class 12 reserves ...CD...
+ TBF[28] class 12 reserves ....DCD.
+ TBF[29] class 12 reserves .....DDC
+ TBF[30] class 12 reserves ...CD...
+ TBF[31] class 12 reserves ...CD...
+  Successfully allocated 32 UL TBFs
 Going to test assignment with many TBF, algorithm B class 1-12 (UL and DL)
  TBF[0] class 1 reserves ...C....
  TBF[1] class 2 reserves ....DC..
@@ -8698,28 +8701,29 @@
  TBF[7] class 8 reserves ....DDCD
  TBF[8] class 9 reserves ...DCD..
  TBF[9] class 10 reserves .....DDC
- TBF[10] class 11 reserves ...CD...
- TBF[11] class 12 reserves ...C....
- TBF[12] class 1 reserves .......C
+ TBF[10] class 11 reserves ...DCD..
+ TBF[11] class 12 reserves .....DCD
+ TBF[12] class 1 reserves ...C....
  TBF[13] class 2 reserves ......DC
- TBF[14] class 3 reserves ...C....
+ TBF[14] class 3 reserves ...DC...
  TBF[15] class 4 reserves ....DCD.
- TBF[16] class 5 reserves ......CD
- TBF[17] class 6 reserves ...DC...
- TBF[18] class 7 reserves .....C..
+ TBF[16] class 5 reserves ...CD...
+ TBF[17] class 6 reserves ......CD
+ TBF[18] class 7 reserves ...CD...
  TBF[19] class 8 reserves ....DDCD
- TBF[20] class 9 reserves .....DCD
- TBF[21] class 10 reserves ...DCD..
- TBF[22] class 11 reserves ...DC...
- TBF[23] class 12 reserves ...C....
- TBF[24] class 1 reserves .......C
+ TBF[20] class 9 reserves .....DDC
+ TBF[21] class 10 reserves ...DDC..
+ TBF[22] class 11 reserves .....DDC
+ TBF[23] class 12 reserves ...DCD..
+ TBF[24] class 1 reserves ...C....
  TBF[25] class 2 reserves ......DC
- TBF[26] class 3 reserves ...C....
- TBF[27] class 4 reserves ....DCD.
- TBF[28] class 5 reserves ......CD
- TBF[29] class 6 reserves ...DC...
- TBF[30] class 7 reserves ......C.
-  Successfully allocated 31 UL TBFs
+ TBF[26] class 3 reserves ......DC
+ TBF[27] class 4 reserves ...DCD..
+ TBF[28] class 5 reserves ...CD...
+ TBF[29] class 6 reserves .....CD.
+ TBF[30] class 7 reserves ...DC...
+ TBF[31] class 8 reserves ....DDCD
+  Successfully allocated 32 UL TBFs
 Going to test assignment with many TBF, algorithm B class 1-29 (UL and DL)
  TBF[0] class 1 reserves ...C....
  TBF[1] class 2 reserves ....DC..
@@ -8731,21 +8735,28 @@
  TBF[7] class 8 reserves ....DDCD
  TBF[8] class 9 reserves ...DCD..
  TBF[9] class 10 reserves .....DDC
- TBF[10] class 11 reserves ...CD...
- TBF[11] class 12 reserves ...C....
- TBF[12] class 13 reserves .....CDD
- TBF[13] class 14 reserves ....DDCD
- TBF[14] class 15 reserves ...DCD..
- TBF[15] class 16 reserves ...DCD..
- TBF[16] class 17 reserves ...DDDDC
- TBF[17] class 18 reserves ...DDC..
- TBF[18] class 19 reserves ...DDCDD
- TBF[19] class 20 reserves ...DDCDD
- TBF[20] class 21 reserves ....CD..
- TBF[21] class 22 reserves .....DC.
- TBF[22] class 23 reserves ...C....
- TBF[23] class 24 reserves ...DDCDD
-  Successfully allocated 24 UL TBFs
+ TBF[10] class 11 reserves ...DCD..
+ TBF[11] class 12 reserves .....DCD
+ TBF[12] class 13 reserves ...CDD..
+ TBF[13] class 14 reserves ....DCDD
+ TBF[14] class 15 reserves ...DDDDC
+ TBF[15] class 16 reserves ...DDCDD
+ TBF[16] class 17 reserves ...DDDCD
+ TBF[17] class 18 reserves ...DDDDC
+ TBF[18] class 19 reserves ...DCDD.
+ TBF[19] class 20 reserves ...DCDD.
+ TBF[20] class 21 reserves ...DDCD.
+ TBF[21] class 22 reserves ....DDCD
+ TBF[22] class 23 reserves ...DDDDC
+ TBF[23] class 24 reserves ...DCDD.
+ TBF[24] class 25 reserves ....DCDD
+ TBF[25] class 26 reserves ...DCDD.
+ TBF[26] class 27 reserves ...DDDDC
+ TBF[27] class 28 reserves ....DDCD
+ TBF[28] class 29 reserves ...CDD..
+ TBF[29] class 1 reserves ...C....
+ TBF[30] class 2 reserves ......DC
+  Successfully allocated 31 UL TBFs
 Going to test assignment with many TBF, algorithm A (DL and UL)
  TBF[0] class 1 reserves ...C....
  TBF[1] class 1 reserves ....C...