start using the RLL RELEASE procedures
So far, we immediately disable the RF channel without following a proper
RLL RELEASE procedure. This patch changes this.
If we locally terminate the connection, the channel allocator now triggers a
RLL RELEASE REQuest, which is responsed by the MS with a RLL RELEASE CONFirm,
based on which we send the RF CHANnel RELease to the BTS.
If the MS terminates the connection, we receive a RLL RELEASE INDication,
based on which we trigger RF CHANnel RELease to the BTS.
diff --git a/openbsc/src/abis_rsl.c b/openbsc/src/abis_rsl.c
index 1a2c58b..726ef23 100644
--- a/openbsc/src/abis_rsl.c
+++ b/openbsc/src/abis_rsl.c
@@ -840,6 +840,27 @@
return abis_rsl_sendmsg(msg);
}
+/* Chapter 8.3.7 Request the release of multiframe mode of RLL connection.
+ This is what higher layers should call. The BTS then responds with
+ RELEASE CONFIRM, which we in turn use to trigger RSL CHANNEL RELEASE,
+ which in turn is acknowledged by RSL CHANNEL RELEASE ACK, which calls
+ lchan_free() */
+int rsl_release_request(struct gsm_lchan *lchan, u_int8_t link_id)
+{
+ struct msgb *msg = rsl_msgb_alloc();
+ struct abis_rsl_rll_hdr *rh;
+
+ rh = (struct abis_rsl_rll_hdr *) msgb_put(msg, sizeof(*rh));
+ init_llm_hdr(rh, RSL_MT_REL_REQ);
+ //rh->c.msg_discr |= ABIS_RSL_MDISC_TRANSP;
+ rh->chan_nr = lchan2chan_nr(lchan);
+ rh->link_id = link_id;
+
+ msg->trx = lchan->ts->trx;
+
+ return abis_rsl_sendmsg(msg);
+}
+
/* Chapter 8.4.2: Channel Activate Acknowledge */
static int rsl_rx_chan_act_ack(struct msgb *msg)
{
@@ -1234,10 +1255,17 @@
}
break;
case RSL_MT_REL_IND:
+ /* BTS informs us of having received DISC from MS */
DEBUGPC(DRLL, "RELEASE INDICATION\n");
+ /* we can now releae the channel on the BTS/Abis side */
+ rsl_chan_release(msg->lchan);
break;
case RSL_MT_REL_CONF:
+ /* BTS informs us of having received UA from MS,
+ * in response to DISC that we've sent earlier */
DEBUGPC(DRLL, "RELEASE CONFIRMATION\n");
+ /* we can now releae the channel on the BTS/Abis side */
+ rsl_chan_release(msg->lchan);
break;
case RSL_MT_ERROR_IND:
rc = rsl_rx_rll_err_ind(msg);