Add VTY option for Nokia BTS that does not send RELease CONFirm message
This option is a workarround for a bug found in Nokia InSite BTS firmware
version 3.0.0. There is no RELease CONFirm message for local end release.
Nokia MetroSite with firmware version 4.178.16 is not affected.
TS 04.06 Chapter 5.4.4.4 "Local end release procedure" states that a
confirm must be sent by layer 2 when receiving a local end release
request.
In order to correctly switch a channel (handover or assignment), local
end release is required.
diff --git a/openbsc/src/libbsc/abis_rsl.c b/openbsc/src/libbsc/abis_rsl.c
index 41bfcdc..f53ba84 100644
--- a/openbsc/src/libbsc/abis_rsl.c
+++ b/openbsc/src/libbsc/abis_rsl.c
@@ -867,6 +867,22 @@
return abis_rsl_sendmsg(msg);
}
+static void rsl_handle_release(struct gsm_lchan *lchan);
+
+/* Special work handler to handle missing RSL_MT_REL_CONF message from
+ * Nokia InSite BTS */
+static void lchan_rel_work_cb(void *data)
+{
+ struct gsm_lchan *lchan = data;
+ int sapi;
+
+ for (sapi = 0; sapi < ARRAY_SIZE(lchan->sapis); ++sapi) {
+ if (lchan->sapis[sapi] == LCHAN_SAPI_REL)
+ lchan->sapis[sapi] = LCHAN_SAPI_UNUSED;
+ }
+ rsl_handle_release(lchan);
+}
+
/* 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,
@@ -890,7 +906,20 @@
DEBUGP(DRLL, "%s RSL RLL RELEASE REQ (link_id=0x%02x, reason=%u)\n",
gsm_lchan_name(lchan), link_id, release_mode);
- return abis_rsl_sendmsg(msg);
+ abis_rsl_sendmsg(msg);
+
+ /* Do not wait for Nokia BTS to send the confirm. */
+ if (is_nokia_bts(lchan->ts->trx->bts)
+ && lchan->ts->trx->bts->nokia.no_loc_rel_cnf
+ && release_mode == RSL_REL_LOCAL_END) {
+ DEBUGP(DRLL, "Scheduling release, becasuse Nokia InSite BTS does not send a RELease CONFirm.\n");
+ lchan->sapis[link_id & 0x7] = LCHAN_SAPI_REL;
+ lchan->rel_work.cb = lchan_rel_work_cb;
+ lchan->rel_work.data = lchan;
+ osmo_timer_schedule(&lchan->rel_work, 0, 0);
+ }
+
+ return 0;
}
int rsl_lchan_set_state(struct gsm_lchan *lchan, int state)