diff --git a/src/bts.cpp b/src/bts.cpp
index 0e3e8f0..988d5f9 100644
--- a/src/bts.cpp
+++ b/src/bts.cpp
@@ -733,28 +733,6 @@
 	struct gprs_rlcmac_ul_tbf *tbf;
 	struct rlc_ul_header *rh = (struct rlc_ul_header *)data;
 
-	switch (len) {
-		case 54:
-			/* omitting spare bits */
-			len = 53;
-			break;
-		case 40:
-			/* omitting spare bits */
-			len = 39;
-			break;
-		case 34:
-			/* omitting spare bits */
-			len = 33;
-			break;
-		case 23:
-			break;
-	default:
-		bts()->decode_error();
-		LOGP(DRLCMACUL, LOGL_ERROR, "Dropping data block with invalid"
-			"length: %d)\n", len);
-		return -EINVAL;
-	}
-
 	/* find TBF inst from given TFI */
 	tbf = ul_tbf_by_tfi(rh->tfi);
 	if (!tbf) {
@@ -1166,9 +1144,33 @@
 int gprs_rlcmac_pdch::rcv_block(uint8_t *data, uint8_t len, uint32_t fn,
 	struct pcu_l1_meas *meas)
 {
+	GprsCodingScheme cs = GprsCodingScheme::getBySizeUL(len);
+	if (!cs) {
+		bts()->decode_error();
+		LOGP(DRLCMACUL, LOGL_ERROR, "Dropping data block with invalid"
+			"length: %d)\n", len);
+		return -EINVAL;
+	}
+
+	LOGP(DRLCMACUL, LOGL_DEBUG, "Got RLC block, coding scheme: %s, "
+		"length: %d (%d))\n", cs.name(), len, cs.maxBytesUL());
+
+	if (cs.isGprs())
+		return rcv_block_gprs(data, fn, meas, cs);
+
+	bts()->decode_error();
+	LOGP(DRLCMACUL, LOGL_ERROR, "Unsupported coding scheme %s\n",
+		cs.name());
+	return -EINVAL;
+}
+
+int gprs_rlcmac_pdch::rcv_block_gprs(uint8_t *data, uint32_t fn,
+	struct pcu_l1_meas *meas, GprsCodingScheme cs)
+{
 	unsigned payload = data[0] >> 6;
 	bitvec *block;
 	int rc = 0;
+	unsigned len = cs.maxBytesUL();
 
 	switch (payload) {
 	case GPRS_RLCMAC_DATA_BLOCK:
diff --git a/src/bts.h b/src/bts.h
index 8831aca..ecbc0c9 100644
--- a/src/bts.h
+++ b/src/bts.h
@@ -33,6 +33,7 @@
 #include "sba.h"
 #include "tbf.h"
 #include "gprs_ms_storage.h"
+#include "gprs_coding_scheme.h"
 #endif
 
 #include <stdint.h>
@@ -63,6 +64,8 @@
 	/* dispatching of messages */
 	int rcv_block(uint8_t *data, uint8_t len, uint32_t fn,
 		struct pcu_l1_meas *meas);
+	int rcv_block_gprs(uint8_t *data, uint32_t fn,
+		struct pcu_l1_meas *meas, GprsCodingScheme cs);
 
 	gprs_rlcmac_bts *bts_data() const;
 	BTS *bts() const;
diff --git a/tests/tbf/TbfTest.err b/tests/tbf/TbfTest.err
index 77366b9..1664e85 100644
--- a/tests/tbf/TbfTest.err
+++ b/tests/tbf/TbfTest.err
@@ -1393,6 +1393,7 @@
 TBF(TFI=0 TLLI=0x00000000 DIR=UL STATE=FLOW) RX: [PCU <- BTS] RACH qbit-ta=31 ra=0x03, Fn=2654167 (17,25,9)
 TBF(TFI=0 TLLI=0x00000000 DIR=UL STATE=FLOW) TX: START Immediate Assignment Uplink (AGCH)
 Sending data request: trx=0 ts=0 sapi=2 arfcn=0 fn=0 block=0 data=2d 06 3f 10 0f 00 00 03 8b 29 07 00 c8 00 10 0b 2b 2b 2b 2b 2b 2b 2b 
+Got RLC block, coding scheme: CS-1, length: 23 (23))
 UL DATA TFI=0 received (V(Q)=0 .. V(R)=0)
 Modifying MS object, UL TLLI: 0x00000000 -> 0xf1223344, not yet confirmed
 Decoded premier TLLI=0xf1223344 of UL DATA TFI=0.
@@ -1445,6 +1446,7 @@
 Sending data request: trx=0 ts=0 sapi=2 arfcn=0 fn=0 block=0 data=2d 06 3f 10 0f 00 00 73 8b 29 07 00 c0 0c 5a 43 2b 2b 2b 2b 2b 2b 2b 
 Searching for first unallocated TFI: TRX=0
  Found TFI=0.
+Got RLC block, coding scheme: CS-1, length: 23 (23))
 +++++++++++++++++++++++++ RX : Uplink Control Block +++++++++++++++++++++++++
 ------------------------- RX : Uplink Control Block -------------------------
 MS requests UL TBF in packet resource request of single block, so we provide one:
@@ -1476,11 +1478,13 @@
 TBF(TFI=0 TLLI=0xf1223344 DIR=UL STATE=ASSIGN) Scheduled UL Assignment polling on FN=2654283
 Scheduling control message at RTS for TBF(TFI=0 TLLI=0xf1223344 DIR=UL STATE=ASSIGN) (TRX=0, TS=7)
 Sending data request: trx=0 ts=7 sapi=5 arfcn=0 fn=2654270 block=8 data=4f 28 5e 24 46 68 8f 1d 00 00 88 00 08 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 
+Got RLC block, coding scheme: CS-1, length: 23 (23))
 +++++++++++++++++++++++++ RX : Uplink Control Block +++++++++++++++++++++++++
 ------------------------- RX : Uplink Control Block -------------------------
 RX: [PCU <- BTS] TBF(TFI=0 TLLI=0xf1223344 DIR=UL STATE=ASSIGN) Packet Control Ack
 TBF: [DOWNLINK] UPLINK ASSIGNED TBF(TFI=0 TLLI=0xf1223344 DIR=UL STATE=ASSIGN)
 TBF(TFI=0 TLLI=0xf1223344 DIR=UL STATE=ASSIGN) changes state from ASSIGN to FLOW
+Got RLC block, coding scheme: CS-1, length: 23 (23))
 UL DATA TFI=0 received (V(Q)=0 .. V(R)=0)
 TBF(TFI=0 TLLI=0xf1223344 DIR=UL STATE=FLOW) restarting timer 3169 while old timer 3169 pending 
 - BSN 0 storing in window (0..63)
@@ -1522,6 +1526,7 @@
 Sending data request: trx=0 ts=0 sapi=2 arfcn=0 fn=0 block=0 data=2d 06 3f 10 0f 00 00 73 8b 29 07 00 c0 0c 5a 43 2b 2b 2b 2b 2b 2b 2b 
 Searching for first unallocated TFI: TRX=0
  Found TFI=0.
+Got RLC block, coding scheme: CS-1, length: 23 (23))
 +++++++++++++++++++++++++ RX : Uplink Control Block +++++++++++++++++++++++++
 ------------------------- RX : Uplink Control Block -------------------------
 MS requests UL TBF in packet resource request of single block, so we provide one:
@@ -1553,11 +1558,13 @@
 TBF(TFI=0 TLLI=0xf1223344 DIR=UL STATE=ASSIGN) Scheduled UL Assignment polling on FN=2654283
 Scheduling control message at RTS for TBF(TFI=0 TLLI=0xf1223344 DIR=UL STATE=ASSIGN) (TRX=0, TS=7)
 Sending data request: trx=0 ts=7 sapi=5 arfcn=0 fn=2654270 block=8 data=4f 28 5e 24 46 68 8f 1d 00 00 88 00 08 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 
+Got RLC block, coding scheme: CS-1, length: 23 (23))
 +++++++++++++++++++++++++ RX : Uplink Control Block +++++++++++++++++++++++++
 ------------------------- RX : Uplink Control Block -------------------------
 RX: [PCU <- BTS] TBF(TFI=0 TLLI=0xf1223344 DIR=UL STATE=ASSIGN) Packet Control Ack
 TBF: [DOWNLINK] UPLINK ASSIGNED TBF(TFI=0 TLLI=0xf1223344 DIR=UL STATE=ASSIGN)
 TBF(TFI=0 TLLI=0xf1223344 DIR=UL STATE=ASSIGN) changes state from ASSIGN to FLOW
+Got RLC block, coding scheme: CS-1, length: 23 (23))
 UL DATA TFI=0 received (V(Q)=0 .. V(R)=0)
 TBF(TFI=0 TLLI=0xf1223344 DIR=UL STATE=FLOW) restarting timer 3169 while old timer 3169 pending 
 - BSN 0 storing in window (0..63)
@@ -1598,6 +1605,7 @@
 TBF(TFI=0 TLLI=0xf1223344 DIR=UL STATE=FLOW) Scheduled DL Assignment polling on FN=2654288
 Scheduling control message at RTS for TBF(TFI=0 TLLI=0xf1223344 DIR=UL STATE=FLOW) (TRX=0, TS=7)
 Sending data request: trx=0 ts=7 sapi=5 arfcn=0 fn=2654275 block=9 data=48 08 00 00 0c 72 00 02 08 00 80 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 
+Got RLC block, coding scheme: CS-1, length: 23 (23))
 +++++++++++++++++++++++++ RX : Uplink Control Block +++++++++++++++++++++++++
 ------------------------- RX : Uplink Control Block -------------------------
 RX: [PCU <- BTS] TBF(TFI=0 TLLI=0xf1223344 DIR=UL STATE=FLOW) Packet Control Ack
@@ -1643,6 +1651,7 @@
 - Timeout for polling PACKET DOWNLINK ACK.
 - Assignment was on PACCH
 - No downlink ACK received yet
+Got RLC block, coding scheme: CS-1, length: 23 (23))
 +++++++++++++++++++++++++ RX : Uplink Control Block +++++++++++++++++++++++++
 ------------------------- RX : Uplink Control Block -------------------------
 MS requests UL TBF in packet resource request of single block, so we provide one:
@@ -1675,11 +1684,13 @@
 TBF(TFI=1 TLLI=0xf5667788 DIR=UL STATE=ASSIGN) Scheduled UL Assignment polling on FN=2654348
 Scheduling control message at RTS for TBF(TFI=1 TLLI=0xf5667788 DIR=UL STATE=ASSIGN) (TRX=0, TS=7)
 Sending data request: trx=0 ts=7 sapi=5 arfcn=0 fn=2654335 block=11 data=48 28 5e ac ce f1 0f 1d 00 00 88 40 09 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 
+Got RLC block, coding scheme: CS-1, length: 23 (23))
 +++++++++++++++++++++++++ RX : Uplink Control Block +++++++++++++++++++++++++
 ------------------------- RX : Uplink Control Block -------------------------
 RX: [PCU <- BTS] TBF(TFI=1 TLLI=0xf5667788 DIR=UL STATE=ASSIGN) Packet Control Ack
 TBF: [DOWNLINK] UPLINK ASSIGNED TBF(TFI=1 TLLI=0xf5667788 DIR=UL STATE=ASSIGN)
 TBF(TFI=1 TLLI=0xf5667788 DIR=UL STATE=ASSIGN) changes state from ASSIGN to FLOW
+Got RLC block, coding scheme: CS-1, length: 23 (23))
 UL DATA TFI=1 received (V(Q)=0 .. V(R)=0)
 TBF(TFI=1 TLLI=0xf5667788 DIR=UL STATE=FLOW) restarting timer 3169 while old timer 3169 pending 
 - BSN 0 storing in window (0..63)
@@ -1707,6 +1718,7 @@
 Sending data request: trx=0 ts=0 sapi=2 arfcn=0 fn=0 block=0 data=2d 06 3f 10 0f 00 00 73 8b 29 07 00 c0 0c 5a 43 2b 2b 2b 2b 2b 2b 2b 
 Searching for first unallocated TFI: TRX=0
  Found TFI=0.
+Got RLC block, coding scheme: CS-1, length: 23 (23))
 +++++++++++++++++++++++++ RX : Uplink Control Block +++++++++++++++++++++++++
 ------------------------- RX : Uplink Control Block -------------------------
 MS requests UL TBF in packet resource request of single block, so we provide one:
@@ -1738,11 +1750,13 @@
 TBF(TFI=0 TLLI=0xf1223344 DIR=UL STATE=ASSIGN) Scheduled UL Assignment polling on FN=2654283
 Scheduling control message at RTS for TBF(TFI=0 TLLI=0xf1223344 DIR=UL STATE=ASSIGN) (TRX=0, TS=7)
 Sending data request: trx=0 ts=7 sapi=5 arfcn=0 fn=2654270 block=8 data=4f 28 5e 24 46 68 83 1d 00 00 88 00 08 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 
+Got RLC block, coding scheme: CS-1, length: 23 (23))
 +++++++++++++++++++++++++ RX : Uplink Control Block +++++++++++++++++++++++++
 ------------------------- RX : Uplink Control Block -------------------------
 RX: [PCU <- BTS] TBF(TFI=0 TLLI=0xf1223344 DIR=UL STATE=ASSIGN) Packet Control Ack
 TBF: [DOWNLINK] UPLINK ASSIGNED TBF(TFI=0 TLLI=0xf1223344 DIR=UL STATE=ASSIGN)
 TBF(TFI=0 TLLI=0xf1223344 DIR=UL STATE=ASSIGN) changes state from ASSIGN to FLOW
+Got RLC block, coding scheme: CS-1, length: 23 (23))
 UL DATA TFI=0 received (V(Q)=0 .. V(R)=0)
 TBF(TFI=0 TLLI=0xf1223344 DIR=UL STATE=FLOW) restarting timer 3169 while old timer 3169 pending 
 - BSN 0 storing in window (0..63)
@@ -1792,6 +1806,7 @@
 Sending data request: trx=0 ts=0 sapi=2 arfcn=0 fn=0 block=0 data=2d 06 3f 10 0f 00 00 73 8b ee 07 00 c0 0c 60 6b 2b 2b 2b 2b 2b 2b 2b 
 Searching for first unallocated TFI: TRX=0
  Found TFI=0.
+Got RLC block, coding scheme: CS-1, length: 23 (23))
 +++++++++++++++++++++++++ RX : Uplink Control Block +++++++++++++++++++++++++
 ------------------------- RX : Uplink Control Block -------------------------
 Got RACH from TLLI=0xf1223344 while TBF(TFI=0 TLLI=0xf1223344 DIR=DL STATE=ASSIGN) still exists. Release pending DL TBF
@@ -1822,6 +1837,7 @@
 TBF(TFI=0 TLLI=0xf1223344 DIR=UL STATE=ASSIGN) Scheduled UL Assignment polling on FN=2654340
 Scheduling control message at RTS for TBF(TFI=0 TLLI=0xf1223344 DIR=UL STATE=ASSIGN) (TRX=0, TS=7)
 Sending data request: trx=0 ts=7 sapi=5 arfcn=0 fn=2654327 block=9 data=4f 28 5e 24 46 68 83 1d 00 00 88 00 08 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 
+Got RLC block, coding scheme: CS-1, length: 23 (23))
 +++++++++++++++++++++++++ RX : Uplink Control Block +++++++++++++++++++++++++
 ------------------------- RX : Uplink Control Block -------------------------
 RX: [PCU <- BTS] TBF(TFI=0 TLLI=0xf1223344 DIR=UL STATE=ASSIGN) Packet Control Ack
@@ -1846,6 +1862,7 @@
 Send dowlink assignment on PACCH, because TBF(TFI=0 TLLI=0xf1223344 DIR=UL STATE=FLOW) exists
 TBF(TFI=1 TLLI=0xf1223344 DIR=DL STATE=NULL) changes state from NULL to ASSIGN
 TBF(TFI=1 TLLI=0xf1223344 DIR=DL STATE=ASSIGN) starting timer 0.
+Got RLC block, coding scheme: CS-1, length: 23 (23))
 UL DATA TFI=0 received (V(Q)=0 .. V(R)=0)
 TBF(TFI=0 TLLI=0xf1223344 DIR=UL STATE=FLOW) restarting timer 3169 while old timer 3169 pending 
 - BSN 0 storing in window (0..63)
@@ -1864,6 +1881,7 @@
 Sending data request: trx=0 ts=0 sapi=2 arfcn=0 fn=0 block=0 data=2d 06 3f 10 0f 00 00 73 8b 29 07 00 c0 0c 5a 43 2b 2b 2b 2b 2b 2b 2b 
 Searching for first unallocated TFI: TRX=0
  Found TFI=0.
+Got RLC block, coding scheme: CS-1, length: 23 (23))
 +++++++++++++++++++++++++ RX : Uplink Control Block +++++++++++++++++++++++++
 ------------------------- RX : Uplink Control Block -------------------------
 MS requests UL TBF in packet resource request of single block, so we provide one:
@@ -1895,11 +1913,13 @@
 TBF(TFI=0 TLLI=0xf1223344 DIR=UL STATE=ASSIGN) Scheduled UL Assignment polling on FN=2654283
 Scheduling control message at RTS for TBF(TFI=0 TLLI=0xf1223344 DIR=UL STATE=ASSIGN) (TRX=0, TS=7)
 Sending data request: trx=0 ts=7 sapi=5 arfcn=0 fn=2654270 block=8 data=4f 28 5e 24 46 68 83 1d 00 00 88 00 08 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 
+Got RLC block, coding scheme: CS-1, length: 23 (23))
 +++++++++++++++++++++++++ RX : Uplink Control Block +++++++++++++++++++++++++
 ------------------------- RX : Uplink Control Block -------------------------
 RX: [PCU <- BTS] TBF(TFI=0 TLLI=0xf1223344 DIR=UL STATE=ASSIGN) Packet Control Ack
 TBF: [DOWNLINK] UPLINK ASSIGNED TBF(TFI=0 TLLI=0xf1223344 DIR=UL STATE=ASSIGN)
 TBF(TFI=0 TLLI=0xf1223344 DIR=UL STATE=ASSIGN) changes state from ASSIGN to FLOW
+Got RLC block, coding scheme: CS-1, length: 23 (23))
 UL DATA TFI=0 received (V(Q)=0 .. V(R)=0)
 TBF(TFI=0 TLLI=0xf1223344 DIR=UL STATE=FLOW) restarting timer 3169 while old timer 3169 pending 
 - BSN 0 storing in window (0..63)
@@ -1967,6 +1987,7 @@
 TBF(TFI=0 TLLI=0x00000000 DIR=UL STATE=FLOW) RX: [PCU <- BTS] RACH qbit-ta=31 ra=0x03, Fn=2654275 (17,31,13)
 TBF(TFI=0 TLLI=0x00000000 DIR=UL STATE=FLOW) TX: START Immediate Assignment Uplink (AGCH)
 Sending data request: trx=0 ts=0 sapi=2 arfcn=0 fn=0 block=0 data=2d 06 3f 10 0f 00 00 03 8b ed 07 00 c8 00 10 0b 2b 2b 2b 2b 2b 2b 2b 
+Got RLC block, coding scheme: CS-1, length: 23 (23))
 UL DATA TFI=0 received (V(Q)=0 .. V(R)=0)
 Detaching TBF from MS object, TLLI = 0xf1223344, TBF = TBF(TFI=0 TLLI=0xf1223344 DIR=DL STATE=ASSIGN)
 Attaching TBF to MS object, TLLI = 0x00000000, TBF = TBF(TFI=0 TLLI=0x00000000 DIR=DL STATE=ASSIGN)
@@ -2001,6 +2022,7 @@
 Sending data request: trx=0 ts=0 sapi=2 arfcn=0 fn=0 block=0 data=2d 06 3f 10 0f 00 00 73 8b 29 07 00 c0 0c 5a 43 2b 2b 2b 2b 2b 2b 2b 
 Searching for first unallocated TFI: TRX=0
  Found TFI=0.
+Got RLC block, coding scheme: CS-1, length: 23 (23))
 +++++++++++++++++++++++++ RX : Uplink Control Block +++++++++++++++++++++++++
 ------------------------- RX : Uplink Control Block -------------------------
 MS requests UL TBF in packet resource request of single block, so we provide one:
@@ -2032,11 +2054,13 @@
 TBF(TFI=0 TLLI=0xf1223344 DIR=UL STATE=ASSIGN) Scheduled UL Assignment polling on FN=2654283
 Scheduling control message at RTS for TBF(TFI=0 TLLI=0xf1223344 DIR=UL STATE=ASSIGN) (TRX=0, TS=7)
 Sending data request: trx=0 ts=7 sapi=5 arfcn=0 fn=2654270 block=8 data=4f 28 5e 24 46 68 83 1d 00 00 88 00 08 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 
+Got RLC block, coding scheme: CS-1, length: 23 (23))
 +++++++++++++++++++++++++ RX : Uplink Control Block +++++++++++++++++++++++++
 ------------------------- RX : Uplink Control Block -------------------------
 RX: [PCU <- BTS] TBF(TFI=0 TLLI=0xf1223344 DIR=UL STATE=ASSIGN) Packet Control Ack
 TBF: [DOWNLINK] UPLINK ASSIGNED TBF(TFI=0 TLLI=0xf1223344 DIR=UL STATE=ASSIGN)
 TBF(TFI=0 TLLI=0xf1223344 DIR=UL STATE=ASSIGN) changes state from ASSIGN to FLOW
+Got RLC block, coding scheme: CS-1, length: 23 (23))
 UL DATA TFI=0 received (V(Q)=0 .. V(R)=0)
 TBF(TFI=0 TLLI=0xf1223344 DIR=UL STATE=FLOW) restarting timer 3169 while old timer 3169 pending 
 - BSN 0 storing in window (0..63)
@@ -2116,6 +2140,7 @@
 TBF(TFI=0 TLLI=0xf1223344 DIR=UL STATE=FLOW) Scheduled DL Assignment polling on FN=2654288
 Scheduling control message at RTS for TBF(TFI=0 TLLI=0xf1223344 DIR=UL STATE=FLOW) (TRX=0, TS=7)
 Sending data request: trx=0 ts=7 sapi=5 arfcn=0 fn=2654275 block=9 data=48 08 00 00 0c 72 00 02 08 00 80 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 
+Got RLC block, coding scheme: CS-1, length: 23 (23))
 +++++++++++++++++++++++++ RX : Uplink Control Block +++++++++++++++++++++++++
 ------------------------- RX : Uplink Control Block -------------------------
 RX: [PCU <- BTS] TBF(TFI=0 TLLI=0xf1223344 DIR=UL STATE=FLOW) Packet Control Ack
@@ -2650,6 +2675,7 @@
 TBF(TFI=0 TLLI=0xf1223344 DIR=DL STATE=FINISHED) append
 TBF(TFI=0 TLLI=0xf1223344 DIR=DL STATE=FINISHED) append
 TBF(TFI=0 TLLI=0xf1223344 DIR=DL STATE=FINISHED) append
+Got RLC block, coding scheme: CS-1, length: 23 (23))
 +++++++++++++++++++++++++ RX : Uplink Control Block +++++++++++++++++++++++++
 ------------------------- RX : Uplink Control Block -------------------------
 RX: [PCU <- BTS] TBF(TFI=0 TLLI=0xf1223344 DIR=DL STATE=FINISHED) Packet Downlink Ack/Nack
@@ -2683,6 +2709,7 @@
 TBF(TFI=0 TLLI=0xf1223344 DIR=DL STATE=WAIT RELEASE) Scheduled DL Assignment polling on FN=2654413
 Scheduling control message at RTS for TBF(TFI=0 TLLI=0xf1223344 DIR=DL STATE=WAIT RELEASE) (TRX=0, TS=7)
 Sending data request: trx=0 ts=7 sapi=5 arfcn=0 fn=2654400 block=2 data=48 08 20 08 0c 72 00 02 18 00 80 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 2b 
+Got RLC block, coding scheme: CS-1, length: 23 (23))
 +++++++++++++++++++++++++ RX : Uplink Control Block +++++++++++++++++++++++++
 ------------------------- RX : Uplink Control Block -------------------------
 RX: [PCU <- BTS] TBF(TFI=0 TLLI=0xf1223344 DIR=DL STATE=WAIT RELEASE) Packet Control Ack