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bsc: Allow to run a mixed TCH/H, TCH/F configuration 

In case the call handling starts on a TCH/H switch to a TCH/F
if fullrate is requested. Add a method that is used to determine
if the mode and current channel are compatible with each other.
This commit is contained in:
Holger Hans Peter Freyther 2012-04-07 13:25:47 +02:00
parent 5d52c97cff
commit a5dcdd9a9a
1 changed files with 22 additions and 4 deletions
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26
openbsc/src/libbsc/bsc_api.c
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@ -311,19 +311,37 @@ int gsm0808_submit_dtap(struct gsm_subscriber_connection *conn,
}
}
/*
* \brief Check if the given channel is compatible with the mode/fullrate
*
* NOTE: This code is only written with TCH/F and TCH/H in mind. This means
* that it will not work for CSD, handover, etc. This also assumes that the
* type of the lchan is either a TCH or a SDCCH.
*/
static int chan_compat_with_mode(struct gsm_lchan *lchan, int chan_mode, int full_rate)
{
if (lchan->type == GSM_LCHAN_SDCCH)
return 1;
if (full_rate && lchan->type != GSM_LCHAN_TCH_F)
return 1;
return 0;
}
/**
* Send a GSM08.08 Assignment Request. Right now this does not contain the
* audio codec type or the allowed rates for the config. It is assumed that
* this is for audio handling and that when we have a TCH it is capable of
* handling the audio codec. In case AMR is used we will leave the multi
* rate configuration to someone else.
* this is for audio handling only. In case the current channel does not allow
* the selected mode a new one will be allocated.
*
* TODO: Add multirate configuration, make it work for more than audio.
*/
int gsm0808_assign_req(struct gsm_subscriber_connection *conn, int chan_mode, int full_rate)
{
struct bsc_api *api;
api = conn->bts->network->bsc_api;
if (conn->lchan->type == GSM_LCHAN_SDCCH) {
if (chan_compat_with_mode(conn->lchan, chan_mode, full_rate) != 0) {
if (handle_new_assignment(conn, chan_mode, full_rate) != 0)
goto error;
} else {