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authorJacob Erlbeck <jerlbeck@sysmocom.de>2016-01-21 20:42:40 +0100
committerJacob Erlbeck <jerlbeck@sysmocom.de>2016-02-08 00:45:37 +0100
commitf04a5b33ecf01a9bdbd7e971cddb0a87608d04a6 (patch)
treeec61a3b19d6123e7211a1ca8ab636d936d4d1aab
parent0316dc6e4808d0413a4edf3738edea44193228e4 (diff)
tbf: Add abort method for downlink TBF
Currently the is a release() function which takes care of statistics and shutdown of properly finished TBFs, but which cannot be used for aborted TBFs. This commit add an abort() method which handles unacked RLC blocks as lost and doesn't start a release timer. This method will be invoked by tbf_free() for downlink TBF. Sponsored-by: On-Waves ehf
-rw-r--r--src/tbf.cpp3
-rw-r--r--src/tbf.h1
-rw-r--r--src/tbf_dl.cpp27
-rw-r--r--tests/tbf/TbfTest.err109
4 files changed, 88 insertions, 52 deletions
diff --git a/src/tbf.cpp b/src/tbf.cpp
index e8a9e3e9..93c932b5 100644
--- a/src/tbf.cpp
+++ b/src/tbf.cpp
@@ -325,7 +325,8 @@ void tbf_free(struct gprs_rlcmac_tbf *tbf)
gprs_rlcmac_rssi_rep(tbf);
if (tbf->direction == GPRS_RLCMAC_DL_TBF) {
gprs_rlcmac_dl_tbf *dl_tbf = as_dl_tbf(tbf);
- gprs_rlcmac_lost_rep(dl_tbf);
+
+ dl_tbf->abort();
dl_tbf->cleanup();
}
diff --git a/src/tbf.h b/src/tbf.h
index ab4145c2..957baedf 100644
--- a/src/tbf.h
+++ b/src/tbf.h
@@ -355,6 +355,7 @@ struct gprs_rlcmac_dl_tbf : public gprs_rlcmac_tbf {
int frames_since_last_drain(unsigned fn) const;
bool keep_open(unsigned fn) const;
int release();
+ int abort();
bool is_control_ts(uint8_t ts) const {
return ts == control_ts;
diff --git a/src/tbf_dl.cpp b/src/tbf_dl.cpp
index a55f179e..64ebea4f 100644
--- a/src/tbf_dl.cpp
+++ b/src/tbf_dl.cpp
@@ -894,6 +894,33 @@ int gprs_rlcmac_dl_tbf::release()
return 0;
}
+int gprs_rlcmac_dl_tbf::abort()
+{
+ uint16_t lost;
+
+ if (state_is(GPRS_RLCMAC_FLOW)) {
+ /* range V(A)..V(S)-1 */
+ lost = m_window.count_unacked();
+
+ /* report all outstanding packets as lost */
+ gprs_rlcmac_received_lost(this, 0, lost);
+ gprs_rlcmac_lost_rep(this);
+
+ /* TODO: Reschedule all LLC frames starting with the one that is
+ * (partly) encoded in chunk 1 of block V(A). (optional) */
+ }
+
+ set_state(GPRS_RLCMAC_RELEASING);
+
+ /* reset rlc states */
+ m_window.reset();
+
+ /* keep to flags */
+ state_flags &= GPRS_RLCMAC_FLAG_TO_MASK;
+ state_flags &= ~(1 << GPRS_RLCMAC_FLAG_CCCH);
+
+ return 0;
+}
int gprs_rlcmac_dl_tbf::rcvd_dl_ack(uint8_t final_ack, unsigned first_bsn,
struct bitvec *rbb)
diff --git a/tests/tbf/TbfTest.err b/tests/tbf/TbfTest.err
index bbd5a82c..8f920ca0 100644
--- a/tests/tbf/TbfTest.err
+++ b/tests/tbf/TbfTest.err
@@ -103,16 +103,17 @@ TBF(TFI=0 TLLI=0xffeeddcc DIR=DL STATE=WAIT RELEASE) Trigger downlink assignment
Send dowlink assignment on PACCH, because TBF(TFI=0 TLLI=0xffeeddcc DIR=DL STATE=WAIT RELEASE) exists
TBF(TFI=1 TLLI=0xffeeddcc DIR=DL STATE=NULL) changes state from NULL to ASSIGN
TBF(TFI=1 TLLI=0xffeeddcc DIR=DL STATE=ASSIGN) starting timer 0.
-DL packet loss of IMSI= / TLLI=0xffeeddcc: 0%
-TBF(TFI=0 TLLI=0xffeeddcc DIR=DL STATE=WAIT RELEASE) free
-TBF(TFI=0 TLLI=0xffeeddcc DIR=DL STATE=WAIT RELEASE) stopping timer 3193.
-PDCH(TS 4, TRX 0): Detaching TBF(TFI=0 TLLI=0xffeeddcc DIR=DL STATE=WAIT RELEASE), 1 TBFs, USFs = 00, TFIs = 00000002.
-Detaching TBF from MS object, TLLI = 0xffeeddcc, TBF = TBF(TFI=0 TLLI=0xffeeddcc DIR=DL STATE=WAIT RELEASE)
+TBF(TFI=0 TLLI=0xffeeddcc DIR=DL STATE=WAIT RELEASE) changes state from WAIT RELEASE to RELEASING
+TBF(TFI=0 TLLI=0xffeeddcc DIR=DL STATE=RELEASING) free
+TBF(TFI=0 TLLI=0xffeeddcc DIR=DL STATE=RELEASING) stopping timer 3193.
+PDCH(TS 4, TRX 0): Detaching TBF(TFI=0 TLLI=0xffeeddcc DIR=DL STATE=RELEASING), 1 TBFs, USFs = 00, TFIs = 00000002.
+Detaching TBF from MS object, TLLI = 0xffeeddcc, TBF = TBF(TFI=0 TLLI=0xffeeddcc DIR=DL STATE=RELEASING)
********** TBF ends here **********
-TBF(TFI=1 TLLI=0xffeeddcc DIR=DL STATE=ASSIGN) free
-TBF(TFI=1 TLLI=0xffeeddcc DIR=DL STATE=ASSIGN) stopping timer 0.
-PDCH(TS 4, TRX 0): Detaching TBF(TFI=1 TLLI=0xffeeddcc DIR=DL STATE=ASSIGN), 0 TBFs, USFs = 00, TFIs = 00000000.
-Detaching TBF from MS object, TLLI = 0xffeeddcc, TBF = TBF(TFI=1 TLLI=0xffeeddcc DIR=DL STATE=ASSIGN)
+TBF(TFI=1 TLLI=0xffeeddcc DIR=DL STATE=ASSIGN) changes state from ASSIGN to RELEASING
+TBF(TFI=1 TLLI=0xffeeddcc DIR=DL STATE=RELEASING) free
+TBF(TFI=1 TLLI=0xffeeddcc DIR=DL STATE=RELEASING) stopping timer 0.
+PDCH(TS 4, TRX 0): Detaching TBF(TFI=1 TLLI=0xffeeddcc DIR=DL STATE=RELEASING), 0 TBFs, USFs = 00, TFIs = 00000000.
+Detaching TBF from MS object, TLLI = 0xffeeddcc, TBF = TBF(TFI=1 TLLI=0xffeeddcc DIR=DL STATE=RELEASING)
********** TBF ends here **********
Destroying MS object, TLLI = 0xffeeddcc
Searching for first unallocated TFI: TRX=0
@@ -183,16 +184,17 @@ TBF(TFI=0 TLLI=0xffeeddcc DIR=DL STATE=WAIT RELEASE) Trigger downlink assignment
Send dowlink assignment on PACCH, because TBF(TFI=0 TLLI=0xffeeddcc DIR=DL STATE=WAIT RELEASE) exists
TBF(TFI=1 TLLI=0xffeeddcc DIR=DL STATE=NULL) changes state from NULL to ASSIGN
TBF(TFI=1 TLLI=0xffeeddcc DIR=DL STATE=ASSIGN) starting timer 0.
-TBF(TFI=1 TLLI=0xffeeddcc DIR=DL STATE=ASSIGN) free
-TBF(TFI=1 TLLI=0xffeeddcc DIR=DL STATE=ASSIGN) stopping timer 0.
-PDCH(TS 4, TRX 0): Detaching TBF(TFI=1 TLLI=0xffeeddcc DIR=DL STATE=ASSIGN), 1 TBFs, USFs = 00, TFIs = 00000001.
-Detaching TBF from MS object, TLLI = 0xffeeddcc, TBF = TBF(TFI=1 TLLI=0xffeeddcc DIR=DL STATE=ASSIGN)
+TBF(TFI=1 TLLI=0xffeeddcc DIR=DL STATE=ASSIGN) changes state from ASSIGN to RELEASING
+TBF(TFI=1 TLLI=0xffeeddcc DIR=DL STATE=RELEASING) free
+TBF(TFI=1 TLLI=0xffeeddcc DIR=DL STATE=RELEASING) stopping timer 0.
+PDCH(TS 4, TRX 0): Detaching TBF(TFI=1 TLLI=0xffeeddcc DIR=DL STATE=RELEASING), 1 TBFs, USFs = 00, TFIs = 00000001.
+Detaching TBF from MS object, TLLI = 0xffeeddcc, TBF = TBF(TFI=1 TLLI=0xffeeddcc DIR=DL STATE=RELEASING)
********** TBF ends here **********
-DL packet loss of IMSI= / TLLI=0xffeeddcc: 0%
-TBF(TFI=0 TLLI=0xffeeddcc DIR=DL STATE=WAIT RELEASE) free
-TBF(TFI=0 TLLI=0xffeeddcc DIR=DL STATE=WAIT RELEASE) stopping timer 3193.
-PDCH(TS 4, TRX 0): Detaching TBF(TFI=0 TLLI=0xffeeddcc DIR=DL STATE=WAIT RELEASE), 0 TBFs, USFs = 00, TFIs = 00000000.
-Detaching TBF from MS object, TLLI = 0xffeeddcc, TBF = TBF(TFI=0 TLLI=0xffeeddcc DIR=DL STATE=WAIT RELEASE)
+TBF(TFI=0 TLLI=0xffeeddcc DIR=DL STATE=WAIT RELEASE) changes state from WAIT RELEASE to RELEASING
+TBF(TFI=0 TLLI=0xffeeddcc DIR=DL STATE=RELEASING) free
+TBF(TFI=0 TLLI=0xffeeddcc DIR=DL STATE=RELEASING) stopping timer 3193.
+PDCH(TS 4, TRX 0): Detaching TBF(TFI=0 TLLI=0xffeeddcc DIR=DL STATE=RELEASING), 0 TBFs, USFs = 00, TFIs = 00000000.
+Detaching TBF from MS object, TLLI = 0xffeeddcc, TBF = TBF(TFI=0 TLLI=0xffeeddcc DIR=DL STATE=RELEASING)
********** TBF ends here **********
Destroying MS object, TLLI = 0xffeeddcc
Searching for first unallocated TFI: TRX=0
@@ -442,11 +444,11 @@ TBF(TFI=0 TLLI=0xffeeddcc DIR=DL STATE=FINISHED) downlink acknowledge
- Final ACK received.
TBF(TFI=0 TLLI=0xffeeddcc DIR=DL STATE=FINISHED) changes state from FINISHED to WAIT RELEASE
TBF(TFI=0 TLLI=0xffeeddcc DIR=DL STATE=WAIT RELEASE) starting timer 3193.
-DL packet loss of IMSI= / TLLI=0xffeeddcc: 0%
-TBF(TFI=0 TLLI=0xffeeddcc DIR=DL STATE=WAIT RELEASE) free
-TBF(TFI=0 TLLI=0xffeeddcc DIR=DL STATE=WAIT RELEASE) stopping timer 3193.
-PDCH(TS 4, TRX 0): Detaching TBF(TFI=0 TLLI=0xffeeddcc DIR=DL STATE=WAIT RELEASE), 0 TBFs, USFs = 00, TFIs = 00000000.
-Detaching TBF from MS object, TLLI = 0xffeeddcc, TBF = TBF(TFI=0 TLLI=0xffeeddcc DIR=DL STATE=WAIT RELEASE)
+TBF(TFI=0 TLLI=0xffeeddcc DIR=DL STATE=WAIT RELEASE) changes state from WAIT RELEASE to RELEASING
+TBF(TFI=0 TLLI=0xffeeddcc DIR=DL STATE=RELEASING) free
+TBF(TFI=0 TLLI=0xffeeddcc DIR=DL STATE=RELEASING) stopping timer 3193.
+PDCH(TS 4, TRX 0): Detaching TBF(TFI=0 TLLI=0xffeeddcc DIR=DL STATE=RELEASING), 0 TBFs, USFs = 00, TFIs = 00000000.
+Detaching TBF from MS object, TLLI = 0xffeeddcc, TBF = TBF(TFI=0 TLLI=0xffeeddcc DIR=DL STATE=RELEASING)
Destroying MS object, TLLI = 0xffeeddcc
********** TBF ends here **********
Searching for first unallocated TFI: TRX=0
@@ -494,18 +496,20 @@ The MS object cannot fully confirm an unexpected TLLI: 0xf1000002, partly confir
Modifying MS object, TLLI = 0xf1000001, IMSI '' -> '001001000000001'
Modifying MS object, TLLI = 0xf1000001, IMSI '001001000000001' -> '001001000000002'
TBF(TFI=1 TLLI=0xf1000002 DIR=DL STATE=FLOW) the IMSI '001001000000002' was already assigned to another MS object: TLLI = 0xf1000001, that IMSI will be removed
-TBF(TFI=0 TLLI=0xf1000001 DIR=DL STATE=FLOW) free
-TBF(TFI=0 TLLI=0xf1000001 DIR=DL STATE=FLOW) Software error: Pending downlink assignment. This may not happen, because the assignment message never gets transmitted. Please be sure not to free in this state. PLEASE FIX!
-PDCH(TS 4, TRX 0): Detaching TBF(TFI=0 TLLI=0xf1000001 DIR=DL STATE=FLOW), 1 TBFs, USFs = 00, TFIs = 00000002.
-Detaching TBF from MS object, TLLI = 0xf1000001, TBF = TBF(TFI=0 TLLI=0xf1000001 DIR=DL STATE=FLOW)
+TBF(TFI=0 TLLI=0xf1000001 DIR=DL STATE=FLOW) changes state from FLOW to RELEASING
+TBF(TFI=0 TLLI=0xf1000001 DIR=DL STATE=RELEASING) free
+TBF(TFI=0 TLLI=0xf1000001 DIR=DL STATE=RELEASING) Software error: Pending downlink assignment. This may not happen, because the assignment message never gets transmitted. Please be sure not to free in this state. PLEASE FIX!
+PDCH(TS 4, TRX 0): Detaching TBF(TFI=0 TLLI=0xf1000001 DIR=DL STATE=RELEASING), 1 TBFs, USFs = 00, TFIs = 00000002.
+Detaching TBF from MS object, TLLI = 0xf1000001, TBF = TBF(TFI=0 TLLI=0xf1000001 DIR=DL STATE=RELEASING)
********** TBF ends here **********
Modifying MS object, TLLI = 0xf1000002, IMSI '' -> '001001000000002'
Clearing MS object, TLLI: 0xf1000001, IMSI: '001001000000002'
Destroying MS object, TLLI = 0x00000000
-TBF(TFI=1 TLLI=0xf1000002 DIR=DL STATE=FLOW) free
-TBF(TFI=1 TLLI=0xf1000002 DIR=DL STATE=FLOW) Software error: Pending downlink assignment. This may not happen, because the assignment message never gets transmitted. Please be sure not to free in this state. PLEASE FIX!
-PDCH(TS 4, TRX 0): Detaching TBF(TFI=1 TLLI=0xf1000002 DIR=DL STATE=FLOW), 0 TBFs, USFs = 00, TFIs = 00000000.
-Detaching TBF from MS object, TLLI = 0xf1000002, TBF = TBF(TFI=1 TLLI=0xf1000002 DIR=DL STATE=FLOW)
+TBF(TFI=1 TLLI=0xf1000002 DIR=DL STATE=FLOW) changes state from FLOW to RELEASING
+TBF(TFI=1 TLLI=0xf1000002 DIR=DL STATE=RELEASING) free
+TBF(TFI=1 TLLI=0xf1000002 DIR=DL STATE=RELEASING) Software error: Pending downlink assignment. This may not happen, because the assignment message never gets transmitted. Please be sure not to free in this state. PLEASE FIX!
+PDCH(TS 4, TRX 0): Detaching TBF(TFI=1 TLLI=0xf1000002 DIR=DL STATE=RELEASING), 0 TBFs, USFs = 00, TFIs = 00000000.
+Detaching TBF from MS object, TLLI = 0xf1000002, TBF = TBF(TFI=1 TLLI=0xf1000002 DIR=DL STATE=RELEASING)
Destroying MS object, TLLI = 0xf1000002
********** TBF ends here **********
********** TBF starts here **********
@@ -1375,9 +1379,10 @@ TX: START TBF(TFI=0 TLLI=0xc0123456 DIR=DL STATE=ASSIGN) Immediate Assignment Do
Sending data request: trx=0 ts=0 sapi=3 arfcn=0 fn=0 block=0 data=34 35 36 2d 06 3f 30 0c 00 00 7d 80 00 00 00 dc 01 23 45 68 00 23 2b 2b 2b 2b
TBF(TFI=0 TLLI=0xc0123456 DIR=DL STATE=ASSIGN) append
TBF(TFI=0 TLLI=0xc0123456 DIR=DL STATE=ASSIGN) append
-TBF(TFI=0 TLLI=0xc0123456 DIR=DL STATE=ASSIGN) free
-PDCH(TS 4, TRX 0): Detaching TBF(TFI=0 TLLI=0xc0123456 DIR=DL STATE=ASSIGN), 0 TBFs, USFs = 00, TFIs = 00000000.
-Detaching TBF from MS object, TLLI = 0xc0123456, TBF = TBF(TFI=0 TLLI=0xc0123456 DIR=DL STATE=ASSIGN)
+TBF(TFI=0 TLLI=0xc0123456 DIR=DL STATE=ASSIGN) changes state from ASSIGN to RELEASING
+TBF(TFI=0 TLLI=0xc0123456 DIR=DL STATE=RELEASING) free
+PDCH(TS 4, TRX 0): Detaching TBF(TFI=0 TLLI=0xc0123456 DIR=DL STATE=RELEASING), 0 TBFs, USFs = 00, TFIs = 00000000.
+Detaching TBF from MS object, TLLI = 0xc0123456, TBF = TBF(TFI=0 TLLI=0xc0123456 DIR=DL STATE=RELEASING)
********** TBF ends here **********
********** TBF starts here **********
Allocating DL TBF: MS_CLASS=45/0
@@ -2875,11 +2880,11 @@ Got RLC block, coding scheme: CS-1, length: 23 (23))
------------------------- RX : Uplink Control Block -------------------------
RX: [PCU <- BTS] TBF(TFI=0 TLLI=0xf1223344 DIR=DL STATE=WAIT RELEASE) Packet Control Ack
TBF: [UPLINK] DOWNLINK ASSIGNED TBF(TFI=0 TLLI=0xf1223344 DIR=DL STATE=WAIT RELEASE)
-DL packet loss of IMSI=0011223344 / TLLI=0xf1223344: 0%
-TBF(TFI=0 TLLI=0xf1223344 DIR=DL STATE=WAIT RELEASE) free
-TBF(TFI=0 TLLI=0xf1223344 DIR=DL STATE=WAIT RELEASE) stopping timer 3193.
-PDCH(TS 7, TRX 0): Detaching TBF(TFI=0 TLLI=0xf1223344 DIR=DL STATE=WAIT RELEASE), 1 TBFs, USFs = 01, TFIs = 00000002.
-Detaching TBF from MS object, TLLI = 0xf1223344, TBF = TBF(TFI=0 TLLI=0xf1223344 DIR=DL STATE=WAIT RELEASE)
+TBF(TFI=0 TLLI=0xf1223344 DIR=DL STATE=WAIT RELEASE) changes state from WAIT RELEASE to RELEASING
+TBF(TFI=0 TLLI=0xf1223344 DIR=DL STATE=RELEASING) free
+TBF(TFI=0 TLLI=0xf1223344 DIR=DL STATE=RELEASING) stopping timer 3193.
+PDCH(TS 7, TRX 0): Detaching TBF(TFI=0 TLLI=0xf1223344 DIR=DL STATE=RELEASING), 1 TBFs, USFs = 01, TFIs = 00000002.
+Detaching TBF from MS object, TLLI = 0xf1223344, TBF = TBF(TFI=0 TLLI=0xf1223344 DIR=DL STATE=RELEASING)
********** TBF ends here **********
TBF(TFI=1 TLLI=0xf1223344 DIR=DL STATE=ASSIGN) changes state from ASSIGN to FLOW
TBF(TFI=1 TLLI=0xf1223344 DIR=DL STATE=FLOW) stopping timer 0.
@@ -3113,12 +3118,13 @@ PDCH(TS 5, TRX 0): Attaching TBF(TFI=0 TLLI=0x00000000 DIR=DL STATE=NULL), 1 TBF
Attaching TBF to MS object, TLLI = 0x00000000, TBF = TBF(TFI=0 TLLI=0x00000000 DIR=DL STATE=NULL)
Allocated TBF(TFI=0 TLLI=0x00000000 DIR=DL STATE=NULL): trx = 0, ul_slots = 10, dl_slots = 3c
DL TBF slots: 0x3c, N: 4, WS: 64
-TBF(TFI=0 TLLI=0x00000000 DIR=DL STATE=NULL) free
-PDCH(TS 2, TRX 0): Detaching TBF(TFI=0 TLLI=0x00000000 DIR=DL STATE=NULL), 0 TBFs, USFs = 00, TFIs = 00000000.
-PDCH(TS 3, TRX 0): Detaching TBF(TFI=0 TLLI=0x00000000 DIR=DL STATE=NULL), 0 TBFs, USFs = 00, TFIs = 00000000.
-PDCH(TS 4, TRX 0): Detaching TBF(TFI=0 TLLI=0x00000000 DIR=DL STATE=NULL), 0 TBFs, USFs = 00, TFIs = 00000000.
-PDCH(TS 5, TRX 0): Detaching TBF(TFI=0 TLLI=0x00000000 DIR=DL STATE=NULL), 0 TBFs, USFs = 00, TFIs = 00000000.
-Detaching TBF from MS object, TLLI = 0x00000000, TBF = TBF(TFI=0 TLLI=0x00000000 DIR=DL STATE=NULL)
+TBF(TFI=0 TLLI=0x00000000 DIR=DL STATE=NULL) changes state from NULL to RELEASING
+TBF(TFI=0 TLLI=0x00000000 DIR=DL STATE=RELEASING) free
+PDCH(TS 2, TRX 0): Detaching TBF(TFI=0 TLLI=0x00000000 DIR=DL STATE=RELEASING), 0 TBFs, USFs = 00, TFIs = 00000000.
+PDCH(TS 3, TRX 0): Detaching TBF(TFI=0 TLLI=0x00000000 DIR=DL STATE=RELEASING), 0 TBFs, USFs = 00, TFIs = 00000000.
+PDCH(TS 4, TRX 0): Detaching TBF(TFI=0 TLLI=0x00000000 DIR=DL STATE=RELEASING), 0 TBFs, USFs = 00, TFIs = 00000000.
+PDCH(TS 5, TRX 0): Detaching TBF(TFI=0 TLLI=0x00000000 DIR=DL STATE=RELEASING), 0 TBFs, USFs = 00, TFIs = 00000000.
+Detaching TBF from MS object, TLLI = 0x00000000, TBF = TBF(TFI=0 TLLI=0x00000000 DIR=DL STATE=RELEASING)
Destroying MS object, TLLI = 0x00000000
********** TBF ends here **********
********** TBF starts here **********
@@ -3152,11 +3158,12 @@ Attaching TBF to MS object, TLLI = 0x00000000, TBF = TBF(TFI=0 TLLI=0x00000000 D
Allocated TBF(TFI=0 TLLI=0x00000000 DIR=DL STATE=NULL EGPRS): trx = 0, ul_slots = 10, dl_slots = 3c
TBF(TFI=0 TLLI=0x00000000 DIR=DL STATE=NULL EGPRS): Setting EGPRS window size to 384
DL TBF slots: 0x3c, N: 4, WS: 384
-TBF(TFI=0 TLLI=0x00000000 DIR=DL STATE=NULL EGPRS) free
-PDCH(TS 2, TRX 0): Detaching TBF(TFI=0 TLLI=0x00000000 DIR=DL STATE=NULL EGPRS), 0 TBFs, USFs = 00, TFIs = 00000000.
-PDCH(TS 3, TRX 0): Detaching TBF(TFI=0 TLLI=0x00000000 DIR=DL STATE=NULL EGPRS), 0 TBFs, USFs = 00, TFIs = 00000000.
-PDCH(TS 4, TRX 0): Detaching TBF(TFI=0 TLLI=0x00000000 DIR=DL STATE=NULL EGPRS), 0 TBFs, USFs = 00, TFIs = 00000000.
-PDCH(TS 5, TRX 0): Detaching TBF(TFI=0 TLLI=0x00000000 DIR=DL STATE=NULL EGPRS), 0 TBFs, USFs = 00, TFIs = 00000000.
-Detaching TBF from MS object, TLLI = 0x00000000, TBF = TBF(TFI=0 TLLI=0x00000000 DIR=DL STATE=NULL EGPRS)
+TBF(TFI=0 TLLI=0x00000000 DIR=DL STATE=NULL EGPRS) changes state from NULL to RELEASING
+TBF(TFI=0 TLLI=0x00000000 DIR=DL STATE=RELEASING EGPRS) free
+PDCH(TS 2, TRX 0): Detaching TBF(TFI=0 TLLI=0x00000000 DIR=DL STATE=RELEASING EGPRS), 0 TBFs, USFs = 00, TFIs = 00000000.
+PDCH(TS 3, TRX 0): Detaching TBF(TFI=0 TLLI=0x00000000 DIR=DL STATE=RELEASING EGPRS), 0 TBFs, USFs = 00, TFIs = 00000000.
+PDCH(TS 4, TRX 0): Detaching TBF(TFI=0 TLLI=0x00000000 DIR=DL STATE=RELEASING EGPRS), 0 TBFs, USFs = 00, TFIs = 00000000.
+PDCH(TS 5, TRX 0): Detaching TBF(TFI=0 TLLI=0x00000000 DIR=DL STATE=RELEASING EGPRS), 0 TBFs, USFs = 00, TFIs = 00000000.
+Detaching TBF from MS object, TLLI = 0x00000000, TBF = TBF(TFI=0 TLLI=0x00000000 DIR=DL STATE=RELEASING EGPRS)
Destroying MS object, TLLI = 0x00000000
********** TBF ends here **********