Add function to update TRAU muxer after assignment or handover
E1 based BTS use TRAU muxer to decode TRAU frames. After changing
channel from one timeslot to another (due to handover or assignment),
the TRAU muxer must be updated. The call reference of the call is
disconnected from the old channel and connected to the new channel.
diff --git a/openbsc/src/libtrau/trau_mux.c b/openbsc/src/libtrau/trau_mux.c
index c9d77cf..7b9bac0 100644
--- a/openbsc/src/libtrau/trau_mux.c
+++ b/openbsc/src/libtrau/trau_mux.c
@@ -31,6 +31,7 @@
#include <osmocom/core/talloc.h>
#include <openbsc/trau_upqueue.h>
#include <osmocom/core/crcgen.h>
+#include <openbsc/transaction.h>
/* this corresponds to the bit-lengths of the individual codec
* parameters as indicated in Table 1.1 of TS 06.10 */
@@ -518,3 +519,20 @@
return subchan_mux_enqueue(mx, dst_e1_ss->e1_ts_ss, trau_bits_out,
TRAU_FRAME_BITS);
}
+
+/* switch trau muxer to new lchan */
+int switch_trau_mux(struct gsm_lchan *old_lchan, struct gsm_lchan *new_lchan)
+{
+ struct gsm_network *net = old_lchan->ts->trx->bts->network;
+ struct gsm_trans *trans;
+
+ /* look up transaction with TCH frame receive enabled */
+ llist_for_each_entry(trans, &net->trans_list, entry) {
+ if (trans->conn && trans->conn->lchan == old_lchan && trans->tch_recv) {
+ /* switch */
+ trau_recv_lchan(new_lchan, trans->callref);
+ }
+ }
+
+ return 0;
+}