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-rw-r--r--src/libbsc/abis_rsl.c22
1 files changed, 20 insertions, 2 deletions
diff --git a/src/libbsc/abis_rsl.c b/src/libbsc/abis_rsl.c
index 980b3e662..cb2828753 100644
--- a/src/libbsc/abis_rsl.c
+++ b/src/libbsc/abis_rsl.c
@@ -1890,8 +1890,26 @@ static int rsl_rx_chan_rqd(struct msgb *msg)
*/
is_lu = !!(chreq_reason == GSM_CHREQ_REASON_LOCATION_UPD);
- /* check availability / allocate channel */
- lchan = lchan_alloc(bts, lctype, is_lu);
+ /* check availability / allocate channel
+ *
+ * - First try to allocate SDCCH.
+ * - If SDCCH is not available, try whatever MS requested, if not SDCCH.
+ * - If there is still no channel available, reject channel request.
+ *
+ * lchan_alloc() possibly tries to allocate larger lchans.
+ *
+ * Note: If the MS requests not TCH/H, we don't know if the phone
+ * supports TCH/H, so we must assign TCH/F or SDCCH.
+ */
+ lchan = lchan_alloc(bts, GSM_LCHAN_SDCCH, 0);
+ if (!lchan && lctype != GSM_LCHAN_SDCCH) {
+ LOGP(DRSL, LOGL_NOTICE, "BTS %d CHAN RQD: no resources for %s "
+ "0x%x, retrying with %s\n",
+ msg->lchan->ts->trx->bts->nr,
+ gsm_lchant_name(GSM_LCHAN_SDCCH), rqd_ref->ra,
+ gsm_lchant_name(lctype));
+ lchan = lchan_alloc(bts, lctype, 0);
+ }
if (!lchan) {
LOGP(DRSL, LOGL_NOTICE, "BTS %d CHAN RQD: no resources for %s 0x%x\n",
msg->lchan->ts->trx->bts->nr, gsm_lchant_name(lctype), rqd_ref->ra);