UE Unable to Obtain IP Address | Flooding error logs in OSMO-PCU

Ron ron.menez at entropysolution.com
Fri Aug 24 04:08:19 UTC 2018


Hi Community,

We were able to remove the error logs flooding in OSMO-PCU by upgrading to the latest version of OSMO Elements and doing the IPV4 forwarding and masquerading ad-hoc as per OpenGGSN documentation (“http://ftp.osmocom.org/docs/latest/osmoggsn-usermanual.pdf”).

Now, UE still not able to obtain an IP address. We made the “auth-policy accept-all” in OSMO-SGSN to accept all request.

Below are the ifconfig and config files used for the testing.

IFCONFIG:
# ifconfig
apn0      Link encap:UNSPEC  HWaddr 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00
          inet addr:192.168.42.0  P-t-P:192.168.42.0  Mask:255.255.255.0
          UP POINTOPOINT RUNNING  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:500
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

enp0s25   Link encap:Ethernet  HWaddr b8:ae:ed:7c:eb:f0
          inet addr:192.168.1.175  Bcast:0.0.0.0  Mask:255.255.255.255
          inet6 addr: fe80::baae:edff:fe7c:ebf0/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:622663 errors:0 dropped:0 overruns:0 frame:0
          TX packets:605604 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:902447377 (902.4 MB)  TX bytes:897214804 (897.2 MB)
          Interrupt:20 Memory:aa100000-aa120000

enp0s25.60 Link encap:Ethernet  HWaddr b8:ae:ed:7c:eb:f0
          inet addr:192.168.10.3  Bcast:192.168.10.255  Mask:255.255.255.0
          inet6 addr: fe80::baae:edff:fe7c:ebf0/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:603890 errors:0 dropped:0 overruns:0 frame:0
          TX packets:600040 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:880955628 (880.9 MB)  TX bytes:891260801 (891.2 MB)

enp0s25.80 Link encap:Ethernet  HWaddr b8:ae:ed:7c:eb:f0
          inet addr:192.168.1.170  Bcast:192.168.1.255  Mask:255.255.255.0
          inet6 addr: fe80::baae:edff:fe7c:ebf0/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:18701 errors:0 dropped:0 overruns:0 frame:0
          TX packets:5462 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:7789419 (7.7 MB)  TX bytes:1101655 (1.1 MB)

OSMO-HLR:
# more osmo-hlr.cfg
log stderr
 logging print extended-timestamp 1
 logging level all debug
 logging filter all 1
 logging print category 1

OSMO-MGW:
# more osmo-mgw-for-bsc.cfg
mgcp
 bind ip 192.168.1.170
 # default port is 2427 (is used for MSC's MGW)
 bind port 12427
line vty
 # default VTY interface is on 127.0.0.1 (used for MSC's MGW)
 bind 127.0.0.2

log stderr
 logging print extended-timestamp 1
 logging level all debug
 logging filter all 1
 logging print category 1

OSMO-STP:
# more osmo-stp.cfg
cs7 instance 0
 xua rkm routing-key-allocation dynamic-permitted
 listen m3ua 2905
  accept-asp-connections dynamic-permitted

log stderr
 logging print extended-timestamp 1
 logging level all debug
 logging filter all 1
 logging print category 1

OSMO-GGSN:
# more osmo-ggsn.cfg
log stderr
 logging level all debug
 logging filter all 1
 logging print category 1
ggsn ggsn0
 gtp bind-ip 192.168.1.175
 apn internet
  tun-device apn0
  type-support v4
  ip dns 0 192.168.1.1
  ip dns 1 8.8.8.8
  ip ifconfig 192.168.42.0/24
  ip prefix dynamic 192.168.42.0/24
  no shutdown
 default-apn internet
 no shutdown ggsn

log stderr
 logging print extended-timestamp 1
 logging level all debug
 logging filter all 1
 logging print category 1

OSMO-HNBGW:
# more osmo-hnbgw.cfg
hnbgw
 iuh
  local-ip 192.168.1.170

log stderr
 logging print extended-timestamp 1
 logging level all debug
 logging filter all 1
 logging print category 1

OSMO-SGSN:
# more osmo-sgsn.cfg
sgsn
 gtp local-ip 192.168.1.170
 ggsn 0 remote-ip 192.168.1.175
 ggsn 0 gtp-version 1
 auth-policy accept-all
 gsup remote-ip 127.0.0.1
ns
 encapsulation udp local-ip 192.168.1.170
 encapsulation udp local-port 23001
 encapsulation framerelay-gre enabled 0

log stderr
 logging print extended-timestamp 1
 logging level all debug
 logging filter all 1
 logging print category 1

OSMO-MSC:
# more osmo-msc.cfg
network
 network country code 515
 mobile network code 94
 short name testNETWORK
 long name testNETWORK
 encryption a5 0
! encryption a5 1
msc
 mgw remote-ip 192.168.1.170

log stderr
 logging print extended-timestamp 1
 logging level all debug
 logging filter all 1
 logging print category 1
 logging level ref debug


OSMO-BSC:
# more osmo-bsc.cfg
network
 network country code 515
 mobile network code 94
 encryption a5 0
! encryption a5 1
 bts 0
  type sysmobts
  band GSM900
  location_area_code 23
  ip.access unit_id 0 0
  gprs mode gprs
  gprs nsvc 0 remote ip 192.168.1.170
  gprs nsvc 0 remote udp port 23001
  gprs nsvc 0 local udp port 23000
  gprs nsvc 0 nsvci 1800
  gprs nsei 1800
  gprs cell bvci 1800
  trx 0
   rf_locked 0
   arfcn 115
   nominal power 23
   timeslot 0
    phys_chan_config CCCH+SDCCH4
   timeslot 1
    phys_chan_config SDCCH8
   timeslot 2
    phys_chan_config TCH/F_TCH/H_PDCH
   timeslot 3
    phys_chan_config TCH/F_TCH/H_PDCH
   timeslot 4
    phys_chan_config TCH/F_TCH/H_PDCH
   timeslot 5
    phys_chan_config TCH/F_TCH/H_PDCH
   timeslot 6
    phys_chan_config TCH/F_TCH/H_PDCH
   timeslot 7
    phys_chan_config PDCH
e1_input
 e1_line 0 driver ipa
msc 0
 mgw remote-ip 192.168.1.170
 mgw remote-port 12427
 allow-emergency deny
 codec-list hr3

log stderr
 logging print extended-timestamp 1
 logging level all debug
 logging filter all 1
 logging print category 1

OSMO-TRX:
# more osmo-trx-umtrx.cfg
log stderr
  logging filter all 1
  logging color 1
  logging print category 1
  logging timestamp 1
  logging print file basename
  logging level all info
!
line vty
 no login
!
trx
 bind-ip 127.0.0.1
 remote-ip 127.0.0.1
 base-port 5700
 dev-args addr=192.168.10.2,pa=NONE,pa_power_max_dbm=23,fifo_ctrl_window=0,status_port=12345
! egprs enable
 tx-sps 4
 rx-sps 4
 rssi-offset 38
 rt-prio 18
 chan 0

OSMO-PCU:
# more osmo-pcu.cfg
!pcu
! flow-control-interval 10
! cs 2
! alloc-algorithm dynamic
! alpha 0
! gamma 0
pcu
 flow-control-interval 10
 cs 2
 alloc-algorithm dynamic
 alpha 0
 gamma 0
 two-phase-access

Best Regard,

Ron Menez
ron.menez at entropysolution.com<mailto:ron.menez at entropysolution.com>


On Aug 10, 2018, at 11:48 PM, Ron <ron.menez at entropysolution.com<mailto:ron.menez at entropysolution.com>> wrote:

Hi Community,

We tried to used the GPRS capability of OSMOCOM.

Installation and configuration were based in the URL provided below:
https://osmocom.org/projects/cellular-infrastructure/wiki/Osmocom_Network_In_The_Box#OsmoBTS

We successfully installed the needed elements to run GPRS and we were able to run the following:
osmo-msc
osmo-stp
osmo-hnbgw (optional)
osmo-ggsn
osmo-sgsn
osmo-mgw
osmo-bsc
osmo-trx-uhd
osmo-hlr
osmo-pcu

UE were able to camp but IP Address is unavailable (checked it under Settings > About Phone > Status)

No session / request coming in the OSMO-SGSN.

We are also flooded with this log in OSMO-PCU:

<000c> gprs_bssgp_pcu.cpp:848 Sending unblock on BVCI 1800
<000c> gprs_bssgp_bss.c:274 BSSGP (BVCI=1800) Tx BVC-BLOCK
<000c> gprs_bssgp.c:288 Cell 001-01-23-0 CI 0 on BVCI 1800
<000c> gprs_bssgp_bss.c:294 BSSGP (BVCI=1800) Tx BVC-RESET CAUSE=O&M intervention
<000c> gprs_bssgp.c:550 BSSGP BVCI=0 Rx BVC STATUS, cause=Protocol error - unspecified
<000c> gprs_bssgp_pcu.cpp:354 Rx BSSGP BVCI=0 (SIGN) PDU type BVC-UNBLOCK unknown
<000c> gprs_bssgp_util.c:238 BSSGP BVCI=0 Tx STATUS, cause=Protocol error - unspecified
<000c> gprs_bssgp_pcu.cpp:304 Rx BSSGP BVCI=0 (SIGN) BVC_RESET_ACK
<000c> gprs_bssgp_pcu.cpp:848 Sending unblock on BVCI 1800
<000c> gprs_bssgp_bss.c:274 BSSGP (BVCI=1800) Tx BVC-BLOCK
<000c> gprs_bssgp.c:288 Cell 001-01-23-0 CI 0 on BVCI 1800
<000c> gprs_bssgp_bss.c:294 BSSGP (BVCI=1800) Tx BVC-RESET CAUSE=O&M intervention
<000c> gprs_bssgp.c:550 BSSGP BVCI=0 Rx BVC STATUS, cause=Protocol error - unspecified
<000c> gprs_bssgp_pcu.cpp:354 Rx BSSGP BVCI=0 (SIGN) PDU type BVC-UNBLOCK unknown
<000c> gprs_bssgp_util.c:238 BSSGP BVCI=0 Tx STATUS, cause=Protocol error - unspecified
<000c> gprs_bssgp_pcu.cpp:304 Rx BSSGP BVCI=0 (SIGN) BVC_RESET_ACK
<000c> gprs_bssgp_pcu.cpp:848 Sending unblock on BVCI 1800
<000c> gprs_bssgp_bss.c:274 BSSGP (BVCI=1800) Tx BVC-BLOCK
<000c> gprs_bssgp.c:288 Cell 001-01-23-0 CI 0 on BVCI 1800
<000c> gprs_bssgp_bss.c:294 BSSGP (BVCI=1800) Tx BVC-RESET CAUSE=O&M intervention
<000c> gprs_bssgp.c:550 BSSGP BVCI=0 Rx BVC STATUS, cause=Protocol error - unspecified
<000c> gprs_bssgp_pcu.cpp:354 Rx BSSGP BVCI=0 (SIGN) PDU type BVC-UNBLOCK unknown
<000c> gprs_bssgp_util.c:238 BSSGP BVCI=0 Tx STATUS, cause=Protocol error - unspecified
<000c> gprs_bssgp_pcu.cpp:304 Rx BSSGP BVCI=0 (SIGN) BVC_RESET_ACK

Any suggestion / comments what seems to be the problem with our setup?

TIA.

Best Regard,

Ron Menez
ron.menez at entropysolution.com<mailto:ron.menez at entropysolution.com>





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