= Chaos Communication Camp 2011 =

At the [http://events.ccc.de/camp/2011/ CCC Camp 2011], we will again be running an experimental OpenBSC network.

The large area of the camp site and the number of users (expected in the 2,000 to 4,000 user range) make this an
ideal test installation for OpenBSC.

Netork structure

Given that there is only a maximum number of 10 ARFCN in the DECT guard band that we could use,
we cannot really afford to run many small BTSs. May small BTSs (single-arfcn) would mean that the capacity
is split/fragmented over the camp site.

Running few but large BTSs (many TRX) at higher power seems like the better strategy. It delivers
capacity without restricting it locally, i.e. capacity can be used anywhere on the camp.

Materials

=== BTS and accessories ===

We will most likely have Motorola Horizon I BTS in GSM 1800, though this is not certain yet

• lots of patchcable for our E1 lines (Allnet TC75205E-500H 500m for 89 EUR)
• lots of coaxial cable for connection the antennas with the BTS
• BTS antennas (sector or omnidirectional)

= BSC and core network ===

We will run a single machine with mISDN or DAHDI E1 cards and [wiki:osmo-nitb] attached to a [wiki:lcr] via MNCC.