OpenBTS: Pola Multi OpenBTS

Sumber: http://wush.net/trac/rangepublic/wiki/multiBTS

Di rangenetworks.com, multi-BTS biasa di jalankan. Sebuah network dengan 2-BTS adalah konfigurasi yang paling sederhana bagi kita yang ingin mengembangkan kemampuan mobilitas & handover.

Jaringan MultiBTS

Dengan semakin berkembangnya jaringan, kita biasanya menginginkan untuk dapat tersambung ke lebih dari satu OpenBTS system yang berjalan bersamaan. Hal ini relatif mudah untuk dilakukan. Pada dasarnya, setiap node OpenBTS berjalan di mesin yang berbeda, semua tersambung ke sipauthserve, PBX dan smqueue yang terpusat (tidak harus berjalan di satu mesin). Berikut adalah dokumentasi caranya.

Initial Requirements

Firstly, the "basic" install does not support secure, networked VoIP communications. Instead, you'll need to install either Asterisk Real-Time or FreeSWITCH.

Secondly, you'll need to move each configuration file (e.g., OpenBTS.db) to the machine that will be running the associated process. Remember that there will now be multiple, different OpenBTS.db files, one for each BTS location. Also remember that ALL processes (except the PBX) expect their configurations in /etc/OpenBTS.

System Diagram

Configuration

You'll need to change the default configuration databases to point at the new machines running each server. In this example:

   PBX (Asterisk)- 192.168.1.0:5060
   smqueue - 192.168.1.0:5063
   sipauthserve - 192.168.1.0: 5064
   OpenBTS (1st BTS) - 192.168.1.1:5062
   OpenBTS (2nd BTS) -192.168.1.2:5062

PBX

Asterisk

Fortunately, Asterisk does not need to be reconfigured unless it is accessing the subscriber registry over the network.

FreeSWITCH

The FreeSWITCH install needs to know the location of smqueue in order to forward SIP MESSAGEs. To do this, change (FS ROOT)/conf/vars.xml to the network location of smqueue:

<X-PRE-PROCESS cmd="set" data="smqueue_port=5063"/>
<X-PRE-PROCESS cmd="set" data="smqueue_host=192.168.1.0"/>

smqueue

/etc/OpenBTS/smqueue.db has numerous variables that need to be set to the new network locations of each service

Asterisk.address -> 192.168.1.0 The network location of the PBX
SIP.myIP2 -> 192.168.1.0 The external-facing IP address of smqueue
SIP.Proxy.Registration -> 192.168.1.0:5064 The location of sipauthserve

sipauthserve

Fortunately, sipauthserve is a passive engine that does not need to know where any other services are located.

OpenBTS

Running multiple BTS's concurrently is a difficult task. Each BTS must not only be configured to know the location of the network services, but also configured to not interfere with their nearby BTS neighbors.

Network Configuration

Every OpenBTS install must be configured (at /etc/OpenBTS/OpenBTS.db) to the smqueue, sipauthserve, and PBX services. This can be done either with the sqlite3 client or via the OpenBTS [command-line interface].

SIP.Local.IP -> 192.168.1.1 (or .2) The external IP of the OpenBTS install.
SIP.Proxy.Registration -> 192.168.1.0:5064 The IP/Port of sipauthserve
SIP.Proxy.SMS -> 192.168.1.0:5063 The IP/Port of smqueue (or FreeSWITCH)
SIP.Proxy.Speech -> 192.168.1.0:5060 The IP/Port of the PBX

BTS Configuration

There are two types of BTS configurations needed to put together a network. First, a number of variables must be THE SAME for all BTSs on a network:

GSM.Identity.MCC The mobile country code
GSM.Identity.MNC The mobile network code
GSM.Identity.BSIC.NCC The network color code, must be unique from all other networks around you.
GSM.CellSelection.NCCsPermitted The NCCs permitted by your BTS. Should include the above.

The following have to be DIFFERENT for each BTS.

GSM.CellSelection.BSIC.BCC The BTS color code. Each BTS should have a different color code.
GSM.Identity.LAC The Location area code. Have to be unique for each BTS
GSM.Identity.CID Cell ID, again unique per BTS.

Debugging

It's pretty easy to get these wrong. For network configuration, use a tool like [ wireshark] to trace the traffic.

Referensi

http://wush.net/trac/rangepublic/wiki/multiBTS

Pranala Menarik

OpenBTS

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Ettus E110

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