Receiving on TS=1 ?

Sylvain Munaut 246tnt at gmail.com
Wed Apr 21 20:16:35 UTC 2010


Some more infos ...

1) I changed the mframe_schedule a bit so that when changing task, we
deactivate the first then wait a little before activating the next
one. I think it would have been possible that previous MF task
scheduled something that would conflict with the new MF task ...

2) I replaced the SDCCH8_0 task with a custom one :

static const struct mframe_sched_item mf_rx_all_nb[] = {
        { .sched_set = NB_QUAD_FH_DL, .modulo = 51, .frame_nr =  0 },
        { .sched_set = NB_QUAD_FH_DL, .modulo = 51, .frame_nr =  4 },
        { .sched_set = NB_QUAD_FH_DL, .modulo = 51, .frame_nr =  8 },
        { .sched_set = NB_QUAD_FH_DL, .modulo = 51, .frame_nr = 12 },
        { .sched_set = NB_QUAD_FH_DL, .modulo = 51, .frame_nr = 16 },
        { .sched_set = NB_QUAD_FH_DL, .modulo = 51, .frame_nr = 20 },
        { .sched_set = NB_QUAD_FH_DL, .modulo = 51, .frame_nr = 24 },
        { .sched_set = NB_QUAD_FH_DL, .modulo = 51, .frame_nr = 28 },
        { .sched_set = NB_QUAD_FH_DL, .modulo = 51, .frame_nr = 32,
          .flags = MF_F_SACCH },
        { .sched_set = NB_QUAD_FH_DL, .modulo = 51, .frame_nr = 36,
          .flags = MF_F_SACCH },
        { .sched_set = NB_QUAD_FH_DL, .modulo = 51, .frame_nr = 40,
          .flags = MF_F_SACCH },
        { .sched_set = NB_QUAD_FH_DL, .modulo = 51, .frame_nr = 44,
          .flags = MF_F_SACCH },
        { .sched_set = NULL }
};

This basically is RX only and receives all SDCCH and SAACH on the timeslot.
When I do this, I see the good data on SAACH and SDCCH correcponding
to subchannel 0. (everything else is garbage).

But if I try a custom task that just RX subchannel 0 :

static const struct mframe_sched_item mf_rx_all_nb[] = {
        { .sched_set = NB_QUAD_FH_DL, .modulo = 51, .frame_nr =  0 },
        { .sched_set = NB_QUAD_FH_DL, .modulo = 2*51, .frame_nr = 32,
          .flags = MF_F_SACCH },
        { .sched_set = NULL }
};

Then, it doesn't work, I don't see the SI5/6 messages on SAACH.

Cheers,

    Sylvain




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