# ULSCH consecutive error count reached 10

**URL:** <https://discourse.myriadrf.org/t/ulsch-consecutive-error-count-reached-10/3825>\
**Category:** LimeSDR\
**Created:** [11 December 2018 10:33 UTC](https://discourse.myriadrf.org/t/ulsch-consecutive-error-count-reached-10/3825 "2018-12-11T10:33:51Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![Diwakar](https://avatars.discourse-cdn.com/v4/letter/d/2acd7d/32.png) [@Diwakar](https://discourse.myriadrf.org/u/Diwakar)\
**Post date:** [11 December 2018 10:33 UTC](https://discourse.myriadrf.org/t/ulsch-consecutive-error-count-reached-10/3825/1 "2018-12-11T10:33:52Z")

</div>

Hi,

We are trying to setup LTE network using OAI and LimeSDR.

We have eNB compiling and running , however we have issues in attaching UE to the network.  
Below were the error appeared in eNB…

[MAC][I][eNB\_dlsch\_ulsch\_scheduler] UE rnti 5452 : in synch, PHR 40 dB  
[RRC][I]UE rnti 5452 failure timer 0/20000 [PHY][I]UE 0 : rnti 5452  
[MAC][I][eNB\_dlsch\_ulsch\_scheduler] UE rnti 5452 : in synch, PHR 40 dB  
[RRC][I]UE rnti 5452 failure timer 0/20000  
[PHY][W][eNB 0, CC 0] frame 310, subframe 2, UE 0: ULSCH consecutive error count reached 20, triggering UL Failure  
[MAC][I][UL\_failure\_indication] [eNB 0][UE 0/5452] Frame 310 subframeP 2 Signaling UL Failure for UE 0 on CC\_id 0 (timer 0)  
[PHY][E]ERROR: Format 1A: rb\_alloc (1ff) \> RIV\_max (144)  
[PHY][E]ERROR: Format 1A: rb\_alloc (1ff) \> RIV\_max (144)  
[PHY][E]ERROR: Format 1A: rb\_alloc (1ff) \> RIV\_max (144)  
[PHY][E]ERROR: Format 1A: rb\_alloc (1ff) \> RIV\_max (144)  
[PHY][E]ERROR: Format 1A: rb\_alloc (1ff) \> RIV\_max (144)  
[MAC][I][eNB\_dlsch\_ulsch\_scheduler] UE 0 rnti 5452: UL Failure after repeated PDCCH orders: Triggering RRC [RRC][I]Frame 330, Subframe 1: UE 5452 UL failure, activating timer MAC: remove UE 0 rnti 5452  
[MAC][I][rrc\_mac\_remove\_ue] Removing UE 0 from Primary CC\_id 0 (rnti 5452)  
[RRC][I]UE rnti 5452 failure timer 6940/20000  
[RRC][I]UE rnti 5452 failure timer 17180/20000  
[RRC][I]Removing UE 5452 instance  
[RRC][W][eNB 0] Removing UE RNTI 5452 MAC: cannot remove UE rnti 5452  
[MAC][W][rrc\_mac\_remove\_ue] rrc\_mac\_remove\_ue: UE 5452 not found  
[S1AP][W][s1ap\_ue\_context\_release\_req] Failed to find ue context associated with eNB ue s1ap id: 0  
[S1AP][E][s1ap\_eNB\_task] Failed to find ue context associated with eNB ue s1ap id: 0  
[RRC][I][FRAME 00000][eNB][MOD 00][RNTI 5452] Removed UE context [INFO] L 4266779680 [INFO] L 4343611520

Also MME stops working and gives segmentation fault  
Below were the mme error log.

layer for transmission  
000523 00097:650926 7FFFF1C65700 TRACE NAS-EM nair-cn/SRC/NAS/EMM/SAP/emm\_as.c:0973 Leaving \_emm\_as\_send() (rc=0)  
000524 00097:650928 7FFFDAFFD700 TRACE MME-AP /SRC/MME\_APP/mme\_app\_transport.c:0057 Entering mme\_app\_handle\_nas\_dl\_req()  
000525 00097:650929 7FFFF1C65700 TRACE NAS-EM nair-cn/SRC/NAS/EMM/SAP/emm\_as.c:0243 Leaving emm\_as\_send() (rc=0)  
000526 00097:650932 7FFFF1C65700 TRACE NAS-EM air-cn/SRC/NAS/EMM/SAP/emm\_sap.c:0143 Leaving emm\_sap\_send() (rc=0)  
000527 00097:650933 7FFFDAFFD700 DEBUG MME-AP /SRC/MME\_APP/mme\_app\_transport.c:0087 MME\_APP:DOWNLINK NAS TRANSPORT. Establishing S1 sig connection. mme\_ue\_s1ap\_id = 1,enb\_ue\_s1ap\_id = 420141  
000528 00097:650935 7FFFDAFFD700 TRACE MME-AP cn/SRC/MME\_APP/mme\_app\_context.c:0715 Entering mme\_ue\_context\_update\_ue\_sig\_connection\_state()  
000529 00097:650936 7FFFDAFFD700 DEBUG MME-AP cn/SRC/MME\_APP/mme\_app\_context.c:0749 MME\_APP: UE Connection State changed to CONNECTED.enb\_ue\_s1ap\_id = 420141, mme\_ue\_s1ap\_id = 1  
000531 00097:650938 7FFFDAFFD700 TRACE MME-AP /SRC/MME\_APP/mme\_app\_transport.c:0098 Leaving mme\_app\_handle\_nas\_dl\_req() (rc=0)  
000530 00097:650937 7FFFDB7FE700 TRACE S1AP C/S1AP/s1ap\_mme\_nas\_procedures.c:0343 Entering s1ap\_generate\_downlink\_nas\_transport()  
000532 00097:650939 7FFFF1C65700 INFO NAS-EM -cn/SRC/NAS/EMM/Authentication.c:0606 EMM-PROC - Timer T3460 (0) expires in 6 seconds  
000533 00097:650941 7FFFF1C65700 TRACE NAS-EM -cn/SRC/NAS/EMM/Authentication.c:0610 Leaving \_authentication\_request() (rc=0)  
000534 00097:650944 7FFFF1C65700 TRACE NAS-EM air-cn/SRC/NAS/EMM/SAP/emm\_sap.c:0110 Entering emm\_sap\_send()  
000535 00097:650945 7FFFF1C65700 TRACE NAS-EM air-cn/SRC/NAS/EMM/SAP/emm\_reg.c:0106 Entering emm\_reg\_send()  
000536 00097:650948 7FFFF1C65700 TRACE NAS-EM air-cn/SRC/NAS/EMM/SAP/emm\_fsm.c:0258 Entering emm\_fsm\_process()  
000537 00097:650950 7FFFF1C65700 INFO NAS-EM air-cn/SRC/NAS/EMM/SAP/emm\_fsm.c:0226 \*\* emm\_fsm\_status : 1  
000538 00097:650952 7FFFF1C65700 INFO NAS-EM air-cn/SRC/NAS/EMM/SAP/emm\_fsm.c:0265 EMM-FSM - Received event COMMON\_PROC\_REQ (1) in state DEREGISTERED  
000539 00097:650955 7FFFF1C65700 TRACE NAS-EM RC/NAS/EMM/SAP/EmmDeregistered.c:0094 Entering EmmDeregistered()  
000540 00097:650958 7FFFF1C65700 INFO NAS-EM air-cn/SRC/NAS/EMM/SAP/emm\_fsm.c:0226 \*\* emm\_fsm\_status : 1  
000541 00097:650960 7FFFDB7FE700 NOTIC S1AP C/S1AP/s1ap\_mme\_nas\_procedures.c:0398 Send S1AP DOWNLINK\_NAS\_TRANSPORT message ue\_id = 0x00000001 MME\_UE\_S1AP\_ID = 0x00000001 eNB\_UE\_S1AP\_ID = 0x06692D  
000542 00097:650961 7FFFF1C65700 TRACE NAS-EM air-cn/SRC/NAS/EMM/SAP/emm\_fsm.c:0176 Entering emm\_fsm\_set\_status()  
000543 00097:650963 7FFFF1C65700 INFO NAS-EM air-cn/SRC/NAS/EMM/SAP/emm\_fsm.c:0182 UE 0x00000001 EMM-FSM - Status changed: DEREGISTERED ===\> COMMON-PROCEDURE-INITIATED  
000544 00097:650967 7FFFDB7FE700 TRACE S1AP C/S1AP/s1ap\_mme\_nas\_procedures.c:0408 Leaving s1ap\_generate\_downlink\_nas\_transport() (rc=0)  
000545 00097:650967 7FFFF1C65700 TRACE MME-AP cn/SRC/MME\_APP/mme\_app\_context.c:0995 Entering mme\_ue\_context\_update\_ue\_emm\_state()  
000546 00097:650970 7FFFF1464700 DEBUG SCTP RC/SCTP/sctp\_primitives\_server.c:0277 [40][2] Sending buffer 0x7fffcc0021d0 of 62 bytes on stream 1 with ppid 18  
000547 00097:650971 7FFFF1C65700 TRACE MME-AP cn/SRC/MME\_APP/mme\_app\_context.c:1002 \*\* ue\_context\_p-\>mm\_state: 0, new\_mm\_state: 0 \*\*000548 00097:650974 7FFFF1C65700 TRACE MME-AP cn/SRC/MME\_APP/mme\_app\_context.c:1017 \*\* ue\_context\_p-\>mm\_state: 0, new\_mm\_state: 0 \*\*000549 00097:650977 7FFFF1C65700 TRACE MME-AP cn/SRC/MME\_APP/mme\_app\_context.c:1018 Leaving mme\_ue\_context\_update\_ue\_emm\_state()  
000550 00097:650980 7FFFF1C65700 TRACE NAS-EM air-cn/SRC/NAS/EMM/SAP/emm\_fsm.c:0194 Leaving emm\_fsm\_set\_status() (rc=0)  
000551 00097:650983 7FFFF1C65700 TRACE NAS-EM RC/NAS/EMM/SAP/EmmDeregistered.c:0155 Leaving EmmDeregistered() (rc=0)  
000552 00097:650986 7FFFF1464700 DEBUG SCTP RC/SCTP/sctp\_primitives\_server.c:0288 Successfully sent 62 bytes on stream 1  
000553 00097:650986 7FFFF1C65700 TRACE NAS-EM air-cn/SRC/NAS/EMM/SAP/emm\_fsm.c:0273 Leaving emm\_fsm\_process() (rc=0)  
000554 00097:650989 7FFFF1C65700 TRACE NAS-EM air-cn/SRC/NAS/EMM/SAP/emm\_reg.c:0119 Leaving emm\_reg\_send() (rc=0)  
000555 00097:650991 7FFFF1C65700 TRACE NAS-EM air-cn/SRC/NAS/EMM/SAP/emm\_sap.c:0143 Leaving emm\_sap\_send() (rc=0)  
000556 00097:650992 7FFFF1C65700 TRACE NAS-EM -cn/SRC/NAS/EMM/Authentication.c:0241 Leaving emm\_proc\_authentication() (rc=0)  
000557 00097:650994 7FFFF1C65700 TRACE NAS-EM nair-cn/SRC/NAS/EMM/SAP/emm\_cn.c:0160 Leaving \_emm\_cn\_authentication\_res() (rc=0)  
000558 00097:650995 7FFFF1C65700 TRACE NAS-EM nair-cn/SRC/NAS/EMM/SAP/emm\_cn.c:0494 Leaving emm\_cn\_send() (rc=0)  
000559 00097:650997 7FFFF1C65700 TRACE NAS-EM air-cn/SRC/NAS/EMM/SAP/emm\_sap.c:0143 Leaving emm\_sap\_send() (rc=0)  
000560 00097:650998 7FFFF1C65700 TRACE NAS-EM TE/openair-cn/SRC/NAS/nas\_proc.c:0402 Leaving nas\_proc\_auth\_param\_res() (rc=0)  
000561 00097:651000 7FFFF1C65700 TRACE NAS-EM TE/openair-cn/SRC/NAS/nas\_proc.c:0376 Leaving nas\_proc\_authentication\_info\_answer() (rc=0)  
\*\* Entering derive\_key\_nas  
\*\* Entering kdf in openair-cn/SRC/SECU/kdf.c

Thread 4 “ITTI 5” received signal SIGSEGV, Segmentation fault.  
[Switching to Thread 0x7ffff1c65700 (LWP 10495)]  
0x00007ffff6e45357 in nettle\_sha256\_init () from /usr/lib/x86\_64-linux-gnu/libnettle.so.6

Can someone help us in identifying what is the problem

Thanks  
M.Diwakar