WIP: Intra-BSC handover testing
Change-Id: Ic47e639a7c8640c736c84a44780fc8e111a64b52
diff --git a/bsc/MSC_ConnectionHandler.ttcn b/bsc/MSC_ConnectionHandler.ttcn
index 5f1095a..b68b4f8 100644
--- a/bsc/MSC_ConnectionHandler.ttcn
+++ b/bsc/MSC_ConnectionHandler.ttcn
@@ -62,7 +62,8 @@
type record MediaState {
MgcpEndpoint mgcp_ep,
MgcpConnState mgcp_conn[2],
- BtsMediaState bts
+ BtsMediaState bts,
+ BtsMediaState bts1 /* only during hand-over */
};
function f_MediaState_init(inout MediaState g_media, integer nr, HostName bts, HostName mgw) {
@@ -78,6 +79,17 @@
peer := -
}
+ g_media.bts1 := {
+ ipa_crcx_seen := false,
+ conn_id := nr,
+ rtp_pt := 0,
+ bts := {
+ host := bts, /* FIXME */
+ port_nr := 9000 + nr*2
+ },
+ peer := -
+ }
+
g_media.mgcp_ep := "rtpbridge/" & int2str(nr) & "@mgw";
for (var integer i:= 0; i < sizeof(g_media.mgcp_conn); i := i+1) {
@@ -166,9 +178,54 @@
oct2int(f_inet_addr(g_media.bts.peer.host)),
g_media.bts.peer.port_nr,
g_media.bts.rtp_pt));
- //g_media.ipa_mdcx_seen := true;
+ //g_media.bts.ipa_mdcx_seen := true;
repeat;
}
+
+ /* on second (new) BTS during hand-over */
+ [not g_media.bts1.ipa_crcx_seen] RSL1.receive(tr_RSL_IPA_CRCX(g_chan_nr)) -> value rsl {
+ /* Extract parameters from request + use in response */
+ if (f_rsl_find_ie(rsl, RSL_IE_IPAC_RTP_PAYLOAD, ie)) {
+ g_media.bts1.rtp_pt := ie.ipa_rtp_pt;
+ }
+ if (f_rsl_find_ie(rsl, RSL_IE_IPAC_RTP_PAYLOAD2, ie)) {
+ g_media.bts1.rtp_pt := ie.ipa_rtp_pt2;
+ }
+ RSL1.send(ts_RSL_IPA_CRCX_ACK(g_chan_nr, g_media.bts1.conn_id,
+ oct2int(f_inet_addr(g_media.bts1.bts.host)),
+ g_media.bts1.bts.port_nr,
+ g_media.bts1.rtp_pt));
+ g_media.bts1.ipa_crcx_seen := true;
+ repeat;
+ }
+ /* on second (new) BTS during hand-over */
+ [g_media.bts1.ipa_crcx_seen] RSL1.receive(tr_RSL_IPA_MDCX(g_chan_nr, ?)) -> value rsl{
+ /* Extract conn_id, ip, port, rtp_pt2 from request + use in response */
+ f_rsl_find_ie(rsl, RSL_IE_IPAC_CONN_ID, ie);
+ if (g_media.bts1.conn_id != ie.ipa_conn_id) {
+ setverdict(fail, "IPA MDCX for unknown ConnId", rsl);
+ self.stop;
+ }
+ /* mandatory */
+ f_rsl_find_ie(rsl, RSL_IE_IPAC_REMOTE_IP, ie);
+ g_media.bts1.peer.host := f_inet_ntoa(int2oct(ie.ipa_remote_ip, 4));
+ f_rsl_find_ie(rsl, RSL_IE_IPAC_REMOTE_PORT, ie);
+ g_media.bts1.peer.port_nr := ie.ipa_remote_port;
+ /* optional */
+ if (f_rsl_find_ie(rsl, RSL_IE_IPAC_RTP_PAYLOAD, ie)) {
+ g_media.bts1.rtp_pt := ie.ipa_rtp_pt;
+ }
+ if (f_rsl_find_ie(rsl, RSL_IE_IPAC_RTP_PAYLOAD2, ie)) {
+ g_media.bts1.rtp_pt := ie.ipa_rtp_pt2;
+ }
+ RSL1.send(ts_RSL_IPA_MDCX_ACK(g_chan_nr, g_media.bts1.conn_id,
+ oct2int(f_inet_addr(g_media.bts1.peer.host)),
+ g_media.bts1.peer.port_nr,
+ g_media.bts1.rtp_pt));
+ //g_media.bts1.ipa_mdcx_seen := true;
+ repeat;
+ }
+
[] MGCP.receive(tr_CRCX) -> value mgcp_cmd {
var SDP_Message sdp;
var integer cid := f_get_free_mgcp_conn();
@@ -219,7 +276,7 @@
int2str(mgcp_conn.sample_rate))),
valueof(ts_SDP_ptime(mgcp_conn.ptime)) } ));
MGCP.send(ts_MDCX_ACK(mgcp_cmd.line.trans_id, mgcp_conn.conn_id, sdp));
- //mgcp_mdcx_seen := true;
+ //g_media.mgcp_mdcx_seen := true;
repeat;
}
}
@@ -635,5 +692,61 @@
return bssap;
}
+type record HandoverState {
+ /* Assignment related bits */
+ boolean rr_ho_cmpl_seen,
+ boolean handover_done,
+ RslChannelNr old_chan_nr
+};
+
+altstep as_handover(inout HandoverState st) runs on MSC_ConnHdlr {
+ var RSL_Message rsl;
+ [not st.rr_ho_cmpl_seen] RSL.receive(tr_RSL_DATA_REQ(g_chan_nr)) -> value rsl {
+ var PDU_ML3_NW_MS l3 := dec_PDU_ML3_NW_MS(rsl.ies[2].body.l3_info.payload);
+ log("Rx L3 from net: ", l3);
+ if (ischosen(l3.msgs.rrm.handoverCommand)) {
+ var RslChannelNr new_chan_nr;
+ var GsmArfcn arfcn;
+ f_ChDesc2RslChanNr(l3.msgs.rrm.handoverCommand.channelDescription2,
+ new_chan_nr, arfcn);
+ /* FIXME: Determine TRX NR by ARFCN, instead of hard-coded TRX0! */
+
+ /* register our component for this channel number at the RSL Emulation */
+ f_rslem_register(0, new_chan_nr, RSL1_PROC);
+
+ /* resume processing of RSL DChan messages, which was temporarily suspended
+ * before performing a hand-over */
+ f_rslem_resume(RSL1_PROC);
+
+ /* send handover complete over the new channel */
+ var PDU_ML3_MS_NW l3_tx := valueof(ts_RRM_HandoverComplete('00'O));
+ RSL1.send(ts_RSL_DATA_IND(new_chan_nr, valueof(ts_RslLinkID_DCCH(0)),
+ enc_PDU_ML3_MS_NW(l3_tx)));
+ /* by default, send via the new channel from now */
+ st.old_chan_nr := g_chan_nr;
+ g_chan_nr := new_chan_nr;
+ st.rr_ho_cmpl_seen := true;
+ repeat;
+ } else {
+ setverdict(fail, "Unexpected L3 received", l3);
+ self.stop;
+ }
+ }
+ [st.rr_ho_cmpl_seen] as_Media();
+ [st.rr_ho_cmpl_seen] RSL.receive(tr_RSL_REL_REQ(st.old_chan_nr, tr_RslLinkID_DCCH(0))) {
+ RSL.send(ts_RSL_REL_CONF(st.old_chan_nr, valueof(ts_RslLinkID_DCCH(0))));
+ repeat;
+ }
+ [st.rr_ho_cmpl_seen] RSL.receive(tr_RSL_RF_CHAN_REL(st.old_chan_nr)) {
+ RSL.send(ts_RSL_RF_CHAN_REL_ACK(st.old_chan_nr));
+ /* unregister for old channel number in RSL emulation */
+ /* FIXME: Determine TRX NR by ARFCN, instead of hard-coded TRX0! */
+ f_rslem_unregister(0, st.old_chan_nr);
+ st.handover_done := true;
+ repeat;
+ }
+}
+
+
}