anyone give me a hint to implement L1 for openbsc

John Wu jwjohn0 at
Fri Sep 16 05:58:34 CEST 2011

Hi Harald,
yeah, the hardware is layer0, then I will also implement L1 code in PC side.

I have download osmo-bts source but I dont very understand the source
architecture. can you introduce the architecture or if there is a design
I need to know where should I implement my L1 code. and the interface with
higher layer.

On Mon, Sep 5, 2011 at 7:19 PM, Harald Welte <laforge at> wrote:

> Hi John,
> On Mon, Sep 05, 2011 at 05:20:17PM +0800, John Wu wrote:
> > We are just planning on this project which use usb based sdr board and
> > will be open design and source.
> In that case, what do you plan to use as layer1?  A simple SDR board
> only implements "Layer 0", but what about layer1?
> osmo-bts and openbsc implement layers >= 2.
> So what is your plan for L1 ?

> > sounds like sysmocom already working on this.
> sysmocom is not building a USB based SDR, but a complete embedded BTS
> product (picocell).  That's quite something different.
> And while osmo-bts and openbsc are free software available in source
> code, the sysmoBTS L0 (hardware) and L1 (FPGA+DSP image) are not.
> So by all means, don't be discouraged from building more hardware that
> interoperates with GSM related Free and Open Source software!

> Regards,
>        Harald
> --
> - Harald Welte <laforge at>
> ============================================================================
> "Privacy in residential applications is a desirable marketing option."
>                                                  (ETSI EN 300 175-7 Ch. A6)
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