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