Re: [Openbts-discuss] how to know a burst is belong to MAC/RLC control block or MAC/RLC data block

[Alexander C. <ale...@gm...>]

John,

As Sylvain already mentioned, coding scheme is encoded in stealing
bits of Normal Bursts, transmitted over PDCH. Each RLC/MAC consist of
4 NB's and thus you have 8 stealing bits pattern for each CS. Check
GSM 05.03 and read gprsdecode sources, it helps.

Also note, that Uplink Coding Scheme is controlled by BTS and thus if
you're on the BTS side you always know which CS you receive.

Are you implementing GPRS for some commercial stack?

On Thu, Oct 27, 2011 at 11:06, John Wu <jw...@gm...> wrote:
> Hi all,
> I want to know how to know GPRS channel coding. GPRS using PDCH, both
> MAC/RLC data block and MAC/RLC control block is
> transmitted on PDCH,  although there is PACCH, PTCH, PTCCH and so on it
> still PDCH. then the MAC/RLC control block is coded
> with cs-1 channel coding scheme and MAC/RLC data block may be coded with
> other channel coding scheme. so when received a
> burst how to know what kind of MAC/RLC block it belong to and which channel
> coding scheme it used?
>
> Thanks!
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-- 
Regards,
Alexander Chemeris.