Decoding SDCCH

[Akib Sayyed]

Dear  List


I am trying to decode SDCCH.

but I am not able to do it properly.

Here is part of burst_ind app_ccch.c code.

    if (rv == 0)
        {
            uint8_t chan_type, chan_ts, chan_ss;
            uint8_t gsmtap_chan_type;
            struct osmo_phsap_prim pp;
            /* Send to GSMTAP */
            rsl_dec_chan_nr(bi->chan_nr, &chan_type, &chan_ss, &chan_ts);
            gsmtap_chan_type = chantype_rsl2gsmtap(
                chan_type,
                bi->flags & BI_FLG_SACCH ? 0x40 : 0x00
            );
            gsmtap_send(gsmtap_inst,
                arfcn, chan_ts, gsmtap_chan_type, chan_ss,
                ntohl(bi->frame_nr), bi->rx_level, bi->snr,
                l2, sizeof(l2)
            );



here l2 is 23 byte.

I need to remove send it to lapdm to decode it further then will pass it to
RR.


Please help me in using Lapdm for decoding :)
-- 
Akib Sayyed
Matrix-Shell
akibsayyed at gmail.com
akibsayyed at matrixshell.com
Mob:- +91-966-514-2243
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