8 Jan
2011
8 Jan
'11
12:16 a.m.
I am trying to implement an experimental EDGE deployment using one of the
DCS1800 models. (If needed for debugging purposes, I can request access to
a GSM900 for GPRS only testing). I have everything compiled and running
with the newest builds as of a few or two ago. EDGE works most of the time,
however randomly it stops working. I have the SGSN and GGSN running, and
typically during these down periods I will see messages appearing on the
SGSN, but none of the typical traffic flowing messages on the GGSN (typical
messages being "Received packet from tun!" and "encaps_tun. Packet
received:
forwarding to tun"). Typically if I wait a period of time, sometimes about
2 minutes, other times for a long time, then the connection returns. During
this entire time the phone still displays the "E" meaning it believes it has
an EDGE connection. If I reboot the phone I will get the PDP entry deleted
and requested messages. As for the SGSN, I am new to GPRS and EDGE and I am
not familiar with a lot of the terms that are appearing, so I can not
comment on what is good or bad. I get the same results if I put three IPs
on one VM and have it running OpenBSC, OpenGGSN, and the OpenBSC based SGSN,
as compared to when I give one VM to OpenBSC and another dual homed VM hosts
OpenGGSN and SGSN.
I guess what I am asking is what do you suggest I should be looking into to
try to figure out what is causing this problem? I have two old Android
phones to play with.. So, at least for the Android phones I have better
access at debugging issues on the phone. Attached below are the relevant
parts of the GGSN conf, SGSN conf, and openBSC conf. Thanks for any
suggestions.
Chris Rankine
##### /etc/ggsn.conf
fg
debug
listen 192.168.21.189
pcodns1 130.207.244.251
pcodns2 130.207.244.251
###### osmo_sgsn.cfg
sgsn
gtp local-ip 192.168.21.188
ggsn 0 remote-ip 192.168.21.189
ggsn 0 gtp-version 1
ns
timer tns-block 3
timer tns-block-retries 3
timer tns-reset 3
timer tns-reset-retries 3
timer tns-test 30
timer tns-alive 3
timer tns-alive-retries 10
encapsulation udp local-ip 192.168.21.188
encapsulation udp local-port 23000
encapsulation framerelay-gre enabled 0
bssgp
##### openbsc.cfg
network
network country code 1
mobile network code 1
short name OpenBSC
long name OpenBSC
auth policy closed
location updating reject cause 13
encryption a5 0
neci 1
rrlp mode none
mm info 1
handover 0
handover window rxlev averaging 10
handover window rxqual averaging 1
handover window rxlev neighbor averaging 10
handover power budget interval 6
handover power budget hysteresis 3
handover maximum distance 9999
timer t3101 10
timer t3103 0
timer t3105 0
timer t3107 0
timer t3109 0
timer t3111 0
timer t3113 60
timer t3115 0
timer t3117 0
timer t3119 0
timer t3141 0
bts 0
type nanobts
band DCS1800
cell_identity 0
location_area_code 1
training_sequence_code 7
base_station_id_code 63
ms max power 40
cell reselection hysteresis 4
rxlev access min 0
channel allocator ascending
rach tx integer 9
rach max transmission 7
ip.access unit_id 3 0
oml ip.access stream_id 255
gprs mode egprs
gprs routing area 1
gprs cell bvci 2
gprs nsei 1
gprs nsvc 0 nsvci 1
gprs nsvc 0 local udp port 23000
gprs nsvc 0 remote udp port 23000
gprs nsvc 0 remote ip 192.168.21.188
trx 0
rf_locked 0
arfcn 514
nominal power 70
max_power_red 0
rsl e1 tei 0
timeslot 0
phys_chan_config CCCH+SDCCH4
timeslot 1
phys_chan_config SDCCH8
timeslot 2
phys_chan_config TCH/F
timeslot 3
phys_chan_config PDCH
timeslot 4
phys_chan_config TCH/F
timeslot 5
phys_chan_config PDCH
timeslot 6
phys_chan_config PDCH
timeslot 7
phys_chan_config PDCH