[Openbts-umts-discuss] Handset failed to connect with BTS

[Access L. <lab...@gm...>]

Hi List,
Recently i have successfully build and run OpenBTS-UMTS, by following the
guide from the wiki page and some external resources.
I have some problems with the connection process from handset to BTS.

I'm using USRP B200 with 2 antenna (VERT900) connected to Tx/Rx and Rx
port, at my first attempt i've got the following errors:

ALERT 140679777597184 15:29:02.9 RadioInterface.cpp:341:pullBuffer:
Overpower detected on receive input
I've also seen that the BTS receive attach request from the handset:

29:02.9 UL_DCCH_MessageType_PR_uplinkDirectTransfer UE#1 URNTI=426d
stCELL_FACH rbid=3
29:02.9 UL GMM Msg: AttachRequest UE#1 URNTI=426d stCELL_FACH
imsi=901700000013840
PDP of 0 is 0, gmm = 40003280, si = 40004d70
PDP of 5 is 0, gmm = 40003280, si = 40004d70
but the previous alert always shown up and the handset failed to connect.

I try to reduce the rxgain by typing the following commands:

OpenBTS-UMTS> rxgain 47
current RX gain is 57 dB
Invalid new value for RX gain.  It must be in range ()
bad argument(s)

On my second attempts, i unplug the antenna at Rx port, so i'm only using 1
antenna at Tx/Rx port and i move more further from the BTS. The "Overpower
detected on receive input" alarm, doesn't show up anymore but the phone
still failed to connect, here are the logs from the OpenBTS-UMTS terminal:
OpenBTS> ALERT 139844615943936 09:58:51.8 URRC.cpp:615:findUeByAsnId: no
match ptmsi=0x0 raimatch=0 findHandlebyPTmsi-urnti=0x0
58:51.8 UL_CCCH_MessageType_PR_rrcConnectionRequest (new UE) UE#1
URNTI=4755 stIdleMode rbid=0
newState: 1 1
58:51.8 DL_CCCH RRC_Connection_Setup_Message message size=58 UE#1
URNTI=4755 stIdleMode rbid=0
newState: 2 1
ALERT 139844615943936 09:58:52.7 URLC.cpp:1755:rlcWriteLowSide:
stateChange: before 0 0 after 0 0
58:53.3 UL_DCCH_MessageType_PR_rrcConnectionSetupComplete UE#1 URNTI=4755
stCELL_FACH rbid=2
58:54.7 UL_DCCH_MessageType_PR_initialDirectTransfer UE#1 URNTI=4755
stCELL_FACH rbid=3
58:54.7 UL GMM Msg: AttachRequest UE#1 URNTI=4755 stCELL_FACH
PDP of 0 is 0, gmm = dc005300, si = dc004440
PDP of 5 is 0, gmm = dc005300, si = dc004440
59:07.7 UL_DCCH_MessageType_PR_uplinkDirectTransfer UE#1 URNTI=4755
stCELL_FACH rbid=3
59:07.7 UL GMM Msg: AttachRequest UE#1 URNTI=4755 stCELL_FACH
imsi=901700000013840
PDP of 0 is 0, gmm = dc005300, si = dc004440
PDP of 5 is 0, gmm = dc005300, si = dc004440
59:22.5 UL_DCCH_MessageType_PR_uplinkDirectTransfer UE#1 URNTI=4755
stCELL_FACH rbid=3
59:22.5 UL GMM Msg: AttachRequest UE#1 URNTI=4755 stCELL_FACH
imsi=901700000013840
PDP of 0 is 0, gmm = dc005300, si = dc004440
PDP of 5 is 0, gmm = dc005300, si = dc004440
59:42.8 UL_DCCH_MessageType_PR_uplinkDirectTransfer UE#1 URNTI=4755
stCELL_FACH rbid=3
59:42.8 UL GMM Msg: AttachRequest UE#1 URNTI=4755 stCELL_FACH
imsi=901700000013840
PDP of 0 is 0, gmm = dc005300, si = dc004440
PDP of 5 is 0, gmm = dc005300, si = dc004440
59:48.2 UL_DCCH_MessageType_PR_signallingConnectionReleaseIndication UE#1
URNTI=4755 stCELL_FACH rbid=2
59:48.2 DL_DCCH RRC_Connection_Release_Message message size=3 UE#1
URNTI=4755 stCELL_FACH rbid=2
59:49.5 UL_DCCH_MessageType_PR_rrcConnectionReleaseComplete UE#1 URNTI=4755
stCELL_FACH rbid=2
newState: 1 2
00:12.9 UL_CCCH_MessageType_PR_rrcConnectionRequest UE#1 URNTI=4755
stIdleMode rbid=0
newState: 1 1
00:12.9 DL_CCCH RRC_Connection_Setup_Message message size=58 UE#1
URNTI=4755 stIdleMode rbid=0
newState: 2 1
ALERT 139844615943936 10:00:13.5 URLC.cpp:1755:rlcWriteLowSide:
stateChange: before 0 0 after 0 0
00:14.0 UL_DCCH_MessageType_PR_rrcConnectionSetupComplete UE#1 URNTI=4755
stCELL_FACH rbid=2
00:15.0 UL_DCCH_MessageType_PR_initialDirectTransfer UE#1 URNTI=4755
stCELL_FACH rbid=3
00:15.0 UL GMM Msg: AttachRequest UE#1 URNTI=4755 stCELL_FACH
imsi=901700000013840
PDP of 0 is 0, gmm = dc005300, si = dc004440
PDP of 5 is 0, gmm = dc005300, si = dc004440
00:28.6 UL_DCCH_MessageType_PR_uplinkDirectTransfer UE#1 URNTI=4755
stCELL_FACH rbid=3
00:28.6 UL GMM Msg: AttachRequest UE#1 URNTI=4755 stCELL_FACH
imsi=901700000013840
PDP of 0 is 0, gmm = dc005300, si = dc004440
PDP of 5 is 0, gmm = dc005300, si = dc004440
00:43.6 UL_DCCH_MessageType_PR_uplinkDirectTransfer UE#1 URNTI=4755
stCELL_FACH rbid=3
00:43.6 UL GMM Msg: AttachRequest UE#1 URNTI=4755 stCELL_FACH
imsi=901700000013840
PDP of 0 is 0, gmm = dc005300, si = dc004440
PDP of 5 is 0, gmm = dc005300, si = dc004440
00:58.6 UL_DCCH_MessageType_PR_uplinkDirectTransfer UE#1 URNTI=4755
stCELL_FACH rbid=3
00:58.6 UL GMM Msg: AttachRequest UE#1 URNTI=4755 stCELL_FACH
imsi=901700000013840
PDP of 0 is 0, gmm = dc005300, si = dc004440
PDP of 5 is 0, gmm = dc005300, si = dc004440
01:13.6 UL_DCCH_MessageType_PR_uplinkDirectTransfer UE#1 URNTI=4755
stCELL_FACH rbid=3
01:13.6 UL GMM Msg: AttachRequest UE#1 URNTI=4755 stCELL_FACH
imsi=901700000013840
PDP of 0 is 0, gmm = dc005300, si = dc004440
PDP of 5 is 0, gmm = dc005300, si = dc004440
01:49.7 UL_DCCH_MessageType_PR_signallingConnectionReleaseIndication UE#1
URNTI=4755 stCELL_FACH rbid=2
01:49.7 DL_DCCH RRC_Connection_Release_Message message size=3 UE#1
URNTI=4755 stCELL_FACH rbid=2
01:50.7 UL_DCCH_MessageType_PR_rrcConnectionReleaseComplete UE#1 URNTI=4755
stCELL_FACH rbid=2
newState: 1 2
01:51.7 UL_CCCH_MessageType_PR_rrcConnectionRequest UE#1 URNTI=4755
stIdleMode rbid=0
newState: 1 1
01:51.7 DL_CCCH RRC_Connection_Setup_Message message size=58 UE#1
URNTI=4755 stIdleMode rbid=0
newState: 2 1
ALERT 139844615943936 10:01:52.4 URLC.cpp:1755:rlcWriteLowSide:
stateChange: before 0 0 after 0 0
01:53.0 UL_DCCH_MessageType_PR_rrcConnectionSetupComplete UE#1 URNTI=4755
stCELL_FACH rbid=2
01:56.4 UL_DCCH_MessageType_PR_initialDirectTransfer UE#1 URNTI=4755
stCELL_FACH rbid=3
01:56.4 UL GMM Msg: AttachRequest UE#1 URNTI=4755 stCELL_FACH
imsi=901700000013840
PDP of 0 is 0, gmm = dc005300, si = dc004440
PDP of 5 is 0, gmm = dc005300, si = dc004440
02:07.3 UL_DCCH_MessageType_PR_uplinkDirectTransfer UE#1 URNTI=4755
stCELL_FACH rbid=3
02:07.3 UL GMM Msg: AttachRequest UE#1 URNTI=4755 stCELL_FACH
imsi=901700000013840
PDP of 0 is 0, gmm = dc005300, si = dc004440
PDP of 5 is 0, gmm = dc005300, si = dc004440
02:22.3 UL_DCCH_MessageType_PR_uplinkDirectTransfer UE#1 URNTI=4755
stCELL_FACH rbid=3
02:22.3 UL GMM Msg: AttachRequest UE#1 URNTI=4755 stCELL_FACH
imsi=901700000013840
PDP of 0 is 0, gmm = dc005300, si = dc004440
PDP of 5 is 0, gmm = dc005300, si = dc004440
02:37.3 UL_DCCH_MessageType_PR_uplinkDirectTransfer UE#1 URNTI=4755
stCELL_FACH rbid=3
02:37.3 UL GMM Msg: AttachRequest UE#1 URNTI=4755 stCELL_FACH
imsi=901700000013840
PDP of 0 is 0, gmm = dc005300, si = dc004440
PDP of 5 is 0, gmm = dc005300, si = dc004440
02:52.3 UL_DCCH_MessageType_PR_uplinkDirectTransfer UE#1 URNTI=4755
stCELL_FACH rbid=3
02:52.3 UL GMM Msg: AttachRequest UE#1 URNTI=4755 stCELL_FACH
imsi=901700000013840
PDP of 0 is 0, gmm = dc005300, si = dc004440
PDP of 5 is 0, gmm = dc005300, si = dc004440
03:07.2 UL_DCCH_MessageType_PR_signallingConnectionReleaseIndication UE#1
URNTI=4755 stCELL_FACH rbid=2
03:07.2 DL_DCCH RRC_Connection_Release_Message message size=3 UE#1
URNTI=4755 stCELL_FACH rbid=2
03:08.1 UL_DCCH_MessageType_PR_rrcConnectionReleaseComplete UE#1 URNTI=4755
stCELL_FACH rbid=2
newState: 1 2
03:23.3 UL_CCCH_MessageType_PR_rrcConnectionRequest UE#1 URNTI=4755
stIdleMode rbid=0
newState: 1 1
03:23.3 DL_CCCH RRC_Connection_Setup_Message message size=58 UE#1
URNTI=4755 stIdleMode rbid=0
newState: 2 1
ALERT 139844615943936 10:03:23.9 URLC.cpp:1755:rlcWriteLowSide:
stateChange: before 0 0 after 0 0
03:24.3 UL_DCCH_MessageType_PR_rrcConnectionSetupComplete UE#1 URNTI=4755
stCELL_FACH rbid=2
03:25.2 UL_DCCH_MessageType_PR_initialDirectTransfer UE#1 URNTI=4755
stCELL_FACH rbid=3
03:25.2 UL GMM Msg: AttachRequest UE#1 URNTI=4755 stCELL_FACH
imsi=901700000013840
PDP of 0 is 0, gmm = dc005300, si = dc004440
PDP of 5 is 0, gmm = dc005300, si = dc004440
03:38.8 UL_DCCH_MessageType_PR_uplinkDirectTransfer UE#1 URNTI=4755
stCELL_FACH rbid=3
03:38.8 UL GMM Msg: AttachRequest UE#1 URNTI=4755 stCELL_FACH
imsi=901700000013840
PDP of 0 is 0, gmm = dc005300, si = dc004440
PDP of 5 is 0, gmm = dc005300, si = dc004440
03:55.5 UL_DCCH_MessageType_PR_uplinkDirectTransfer UE#1 URNTI=4755
stCELL_FACH rbid=3
03:55.5 UL GMM Msg: AttachRequest UE#1 URNTI=4755 stCELL_FACH
imsi=901700000013840
PDP of 0 is 0, gmm = dc005300, si = dc004440
PDP of 5 is 0, gmm = dc005300, si = dc004440
04:09.0 UL_DCCH_MessageType_PR_uplinkDirectTransfer UE#1 URNTI=4755
stCELL_FACH rbid=3
04:09.0 UL GMM Msg: AttachRequest UE#1 URNTI=4755 stCELL_FACH
imsi=901700000013840
PDP of 0 is 0, gmm = dc005300, si = dc004440
PDP of 5 is 0, gmm = dc005300, si = dc004440
04:30.0 UL_DCCH_MessageType_PR_uplinkDirectTransfer UE#1 URNTI=4755
stCELL_FACH rbid=3
04:30.0 UL GMM Msg: AttachRequest UE#1 URNTI=4755 stCELL_FACH
imsi=901700000013840
PDP of 0 is 0, gmm = dc005300, si = dc004440
PDP of 5 is 0, gmm = dc005300, si = dc004440
05:20.1 UL_DCCH_MessageType_PR_signallingConnectionReleaseIndication UE#1
URNTI=4755 stCELL_FACH rbid=2
05:20.1 DL_DCCH RRC_Connection_Release_Message message size=3 UE#1
URNTI=4755 stCELL_FACH rbid=2
05:22.3 UL_DCCH_MessageType_PR_rrcConnectionReleaseComplete UE#1 URNTI=4755
stCELL_FACH rbid=2
newState: 1 2

My questions for the above conditions are:
1. What command should i use to reduce rxgain in OpenBTS-UMTSCLI?
2. Is there any settings that i should enable to make the phone connected
to the BTS? I'm using programmable sim card and already add subscriber
using nmcli.py command.

Could someone please give some explanation regarding the above conditions?

Thanks & Regards,

Erik