Running GPRS/EDGE Data Services with Osmocom
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1 Running GPRS/EDGE Data Services with Osmocom Daniel Willmann April 21, 2017 sysmocom - s.f.m.c. GmbH
2 Contents GPRS structure PCU NITB SGSN GGSN Running GPRS Daniel Willmann Running GPRS/EDGE Data Services with Osmocom sysmocom - s.f.m.c. GmbH 2
3 # 0 * # 0 * # 0 * # 0 * Classic GPRS Structure of a GSM network PSTN PSTN ME: Mobile Equipment MT/TE SIM-ME SIM ICC Um UE: User Equipment MS: Mobile Station BTS: Base Transceiver Station Abis GERAN: GSM EDGE Radio Access Network BSS: Base Station System AN: Access Network BSC: Base Station Controller CS: Circuit Switched Nb A Gb MSC: Mobile Switching Centre CS-MGW Mc E Gn SGSN Gi GPRS PS: Packet Switched GMSC Nc MSC server Gc Gp GGSN VLR G B D HSS C H HLR AuC F Gf,Sv EIR Gd SMS-GMSC PS & CS CN: Core Network Internet Daniel Willmann Running GPRS/EDGE Data Services with Osmocom sysmocom - s.f.m.c. GmbH 3
4 Osmocom GPRS Configuration needed for: OsmoNITB OsmoPCU (located at BTS level) OsmoSGSN OpenGGSN Daniel Willmann Running GPRS/EDGE Data Services with Osmocom sysmocom - s.f.m.c. GmbH 4
5 GPRS configuration VTY CTRL OsmoNITB OpenGGSN Includes functionality of * BSC * MSC/VLR * HLR/AUC * SMSC IP: c.c.c.c GTP/IP IP: x.x.x.x Abis/IP VTY IP: b.b.b.b CTRL OsmoSGSN IP: a.a.a.a Gb/IP VTY IP: y.y.y.y OsmoBTS CTRL PCU Sock VTY IP: y.y.y.y OsmoPCU CTRL osmo-bts-trx osmo-bts-sysmo OsmoTRX Transceiver SDR Hardware sysmobts PHY sysmobts Hardware sysmobts direct PHY access Daniel Willmann Running GPRS/EDGE Data Services with Osmocom sysmocom - s.f.m.c. GmbH 5
6 GPRS configuration (PCU) Setup coding scheme (CS) and when to switch CS Throughput optimizations (flow control, TBF idle time) BSC/NITB configures the rest pcu cs 2 cs max 4 cs threshold alloc - algorithm dynamic dl -tbf -idle - time 1000 Daniel Willmann Running GPRS/EDGE Data Services with Osmocom sysmocom - s.f.m.c. GmbH 6
7 GPRS configuration (NITB) network bts 0 gprs mode gprs gprs routing area 1 gprs cell bvci 1234 gprs nsei 1234 gprs nsvc 0 nsvci 1234 gprs nsvc 0 local udp port gprs nsvc 0 remote udp port gprs nsvc 0 remote ip a.a.a.a trx 0 timeslot 6 phys_chan_config TCH / F_TCH / H_PDCH timeslot 7 phys_ chan_ config PDCH Daniel Willmann Running GPRS/EDGE Data Services with Osmocom sysmocom - s.f.m.c. GmbH 7
8 GPRS configuration (SGSN) sgsn gtp local -ip b.b.b.b ggsn 0 remote -ip c.c.c.c ggsn 0 gtp - version 1 auth - policy closed imsi - acl add ! ns encapsulation udp local -ip a.a.a.a encapsulation udp local - port encapsulation framerelay - gre enabled 0 Daniel Willmann Running GPRS/EDGE Data Services with Osmocom sysmocom - s.f.m.c. GmbH 8
9 GPRS configuration (SGSN) sgsn gtp local -ip b.b.b.b ggsn 0 remote -ip c.c.c.c ggsn 0 gtp - version 1 auth - policy closed imsi - acl add ! ns encapsulation udp local -ip a.a.a.a encapsulation udp local - port encapsulation framerelay - gre enabled 0 Daniel Willmann Running GPRS/EDGE Data Services with Osmocom sysmocom - s.f.m.c. GmbH 8
10 GPRS configuration (SGSN) auth-policy can be accept-all, closed, acl-only, remote auth-policy remote for authorization and encryption with osmo-hlr Daniel Willmann Running GPRS/EDGE Data Services with Osmocom sysmocom - s.f.m.c. GmbH 9
11 GPRS configuration (GGSN) listen c.c.c.c net /24 pcodns Daniel Willmann Running GPRS/EDGE Data Services with Osmocom sysmocom - s.f.m.c. GmbH 10
12 Miscellaneous Don t forget masquerading/ip forwarding: # echo 1 > / proc / sys / net / ipv4 / ip_forward # iptables - t nat - A POSTROUTING - o eth0 - j MASQUERADE Enable data roaming on your phone APN might need to be set manually Daniel Willmann Running GPRS/EDGE Data Services with Osmocom sysmocom - s.f.m.c. GmbH 11
13 Running it all Demo Daniel Willmann Running GPRS/EDGE Data Services with Osmocom sysmocom - s.f.m.c. GmbH 12
14 Thank you Questions? https: //osmocom.org/projects/cellular-infrastructure/wiki/openbsc_gprs Daniel Willmann Running GPRS/EDGE Data Services with Osmocom sysmocom - s.f.m.c. GmbH 13
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