[Openlte-discuss] After MME & RRC Connection Release; Many Status Report Requests from eNodeB "Re-sending AMD PDU"

[Chuck B. <bo...@gm...>]

Hello,

I have compiled, and have been running V20 without any major issues. Though, I am having one issue that maybe someone can shed some light on for me. This “issue” seems to be occurring from 18.X through the current distro on any phone I have used.

Not sure if I am not closing a connection between the ue and the enodeb correctly, but on *occasion* the enodeb continuously sends Status Report AMD PDU to the UE after the MME, and RRC connection release. The UE never “sees” the requests I believe, bc nothing is sent back (perhaps) though the UE will then attempt to attach back to the enodeb after a period of time (20 secs generally) where the enodeb never sees the attach message until its rebooted. Any Ideas as to why the spurious amount of Status Report Messages? I have attached both a good release without incident, and a release in which the resending of the Status Report AMD message happens 20x’s/second and continues on for roughly 5 seconds.

Successful release sequence:

[2016-26-07 18:52:49] LTE_fdd_enb_mme.cc 1699 Sending Attach Reject (0x0f) for RNTI=61, RB=SRB1 07440F
[2016-26-07 18:52:49] LTE_fdd_enb_rrc.cc 294 Received NAS message for RNTI=61 and RB=SRB1 07440F
[2016-26-07 18:52:49] LTE_fdd_enb_rrc.cc 747 Sending DL Info Transfer for RNTI=61, RB=SRB1 0800183A2078
[2016-26-07 18:52:49] LTE_fdd_enb_rrc.cc 323 Received MME command Release for RNTI=61 and RB=SRB1
[2016-26-07 18:52:49] | LTE_fdd_enb_rrc.cc 983 Sending RRC Connection Release for RNTI=61, RB=SRB1 2802
[2016-26-07 18:52:49] LTE_fdd_enb_rlc.cc 595 Received SDU for RNTI=61 and RB=SRB1 000800183A207800000000
[2016-26-07 18:52:49] LTE_fdd_enb_rlc.cc 871 Sending AMD PDU for RNTI=61, RB=SRB1, VT(A)=0, SN=0, VT(MS)=512, RF=AMD PDU, P=Status Report Requested, FI=Full SDU A000000800183A207800000000
[2016-26-07 18:52:49] LTE_fdd_enb_rlc.cc 595 Received SDU for RNTI=61 and RB=SRB1 01280200000000
[2016-26-07 18:52:49] LTE_fdd_enb_rlc.cc 871 Sending AMD PDU for RNTI=61, RB=SRB1, VT(A)=0, SN=1, VT(MS)=512, RF=AMD PDU, P=Status Report Requested, FI=Full SDU A00101280200000000
[2016-26-07 18:52:49] LTE_fdd_enb_rlc.cc 234 Re-sending AMD PDU for RNTI=61, RB=SRB1, VT(A)=0, SN=0, VT(MS)=512, RF=AMD PDU, P=Status Report Requested, FI=Full SDU A000000800183A207800000000
[2016-26-07 18:52:49] LTE_fdd_enb_rlc.cc 270 Received PDU for RNTI=61 and RB=SRB1 0008
[2016-26-07 18:52:49] LTE_fdd_enb_rlc.cc 578 Received STATUS PDU 0008
[2016-26-07 18:52:49] LTE_fdd_enb_rlc.cc 270 Received PDU for RNTI=61 and RB=SRB1 0008
[2016-26-07 18:52:49] LTE_fdd_enb_rlc.cc 578 Received STATUS PDU 0008
[2016-26-07 18:52:49] LTE_fdd_enb_rlc.cc 270 Received PDU for RNTI=61 and RB=SRB1 0008
[2016-26-07 18:52:49] LTE_fdd_enb_rlc.cc 578 Received STATUS PDU 0008

Not Successful: 

[2016-26-07 18:53:11] LTE_fdd_enb_mme.cc 1471 Rejecting User, preparing for deletion
[2016-26-07 18:53:11] LTE_fdd_enb_mme.cc 1699 Sending Attach Reject (0x0f) for RNTI=65, RB=SRB1 07440F
[2016-26-07 18:53:11] LTE_fdd_enb_rrc.cc 294 Received NAS message for RNTI=65 and RB=SRB1 07440F
[2016-26-07 18:53:11] LTE_fdd_enb_rrc.cc 747 Sending DL Info Transfer for RNTI=65, RB=SRB1 0800183A2078
[2016-26-07 18:53:11] LTE_fdd_enb_rrc.cc 323 Received MME command Release for RNTI=65 and RB=SRB1
[2016-26-07 18:53:11] LTE_fdd_enb_rrc.cc 983 Sending RRC Connection Release for RNTI=65, RB=SRB1 2802
[2016-26-07 18:53:11] LTE_fdd_enb_rlc.cc 595 Received SDU for RNTI=65 and RB=SRB1 000800183A207800000000
[2016-26-07 18:53:11] LTE_fdd_enb_rlc.cc 871 Sending AMD PDU for RNTI=65, RB=SRB1, VT(A)=0, SN=0, VT(MS)=512, RF=AMD PDU, P=Status Report Requested, FI=Full SDU A000000800183A207800000000
[2016-26-07 18:53:11] LTE_fdd_enb_rlc.cc 595 Received SDU for RNTI=65 and RB=SRB1 01280200000000
[2016-26-07 18:53:11] LTE_fdd_enb_rlc.cc 871 Sending AMD PDU for RNTI=65, RB=SRB1, VT(A)=0, SN=1, VT(MS)=512, RF=AMD PDU, P=Status Report Requested, FI=Full SDU A00101280200000000
[2016-26-07 18:53:11] LTE_fdd_enb_rlc.cc 234 Re-sending AMD PDU for RNTI=65, RB=SRB1, VT(A)=0, SN=0, VT(MS)=512, RF=AMD PDU, P=Status Report Requested, FI=Full SDU A000000800183A207800000000
[2016-26-07 18:53:11] LTE_fdd_enb_rlc.cc 234 Re-sending AMD PDU for RNTI=65, RB=SRB1, VT(A)=0, SN=0, VT(MS)=512, RF=AMD PDU, P=Status Report Requested, FI=Full SDU A000000800183A207800000000
[2016-26-07 18:53:11] LTE_fdd_enb_rlc.cc 234 Re-sending AMD PDU for RNTI=65, RB=SRB1, VT(A)=0, SN=0, VT(MS)=512, RF=AMD PDU, P=Status Report Requested, FI=Full SDU A000000800183A207800000000
[2016-26-07 18:53:11] LTE_fdd_enb_rlc.cc 234 Re-sending AMD PDU for RNTI=65, RB=SRB1, VT(A)=0, SN=0, VT(MS)=512, RF=AMD PDU, P=Status Report Requested, FI=Full SDU A000000800183A207800000000
[2016-26-07 18:53:11] LTE_fdd_enb_rlc.cc 234 Re-sending AMD PDU for RNTI=65, RB=SRB1, VT(A)=0, SN=0, VT(MS)=512, RF=AMD PDU, P=Status Report Requested, FI=Full SDU A000000800183A207800000000
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Many, many many more identical messages

Any help or insight would be greatly appreciated.

Thanks, 
Chuck