Request for review: GSM phone hardware introduction

Harald Welte laforge at
Wed Apr 14 21:14:42 UTC 2010

On Wed, Apr 14, 2010 at 12:34:36PM +0200, willem wrote:
> On 2010-04-13 21:07:08, Harald Welte wrote:
> > Hi Jake (and others),
> >
> > On Tue, Apr 13, 2010 at 10:09:52AM -0700, Jacob Appelbaum wrote:
> >   
> >>> I've written an introductory text on GSM mobile phone architecture,
> >>> and before officially posting/announcing it, I thought I'd invite 
> >>> the members of this list to do some review and give feedback!
> >>>       
> >> Do you have the latex available? It's hard to edit and send a diff of a
> >> pdf...
> >>     
> did you omit qualcomm in your list of baseband manufacturers
> intentionaly? because it produces mostly cdma and 3g chipsets, and not gsm?

yes, that's why I ignored Qualcomm.

> i have several additions to your document:


> == in the list in subsection{MCU peripherals}
> \item Audio routing, selecting how audio is routed in the phone, between
> AP, BB, carspeaker,headset, mediaspeaker, phonespeaker and microphone

good point - though a lot of complexity is only required in the
smartphone case.

> == addition to \subsection{The Digital Baseband (DBB)}
> The baseband MCU usually runs a realtime operating system(RTOS), like
> nucleus, vxworks, or l4k.

i've added it, but to the software architecture part.

> == a subsection in section{Miscellaneous Topics}

thanks.  I've rewritten this entirely and added a number of security
related sub-sections to the document.

Please find the new version v0.3 attached.

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