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osmo-ttcn3-hacks/pcu/PCU_Tests_RAW.ttcn

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module PCU_Tests_RAW {
/* "RAW" PCU tests: Talk directly to the PCU socket of OsmoPCU on the one hand side (emulating
the BTS/BSC side PCU socket server) and the Gb interface on the other hand side. No NS/BSSGP
Emulation is used; rather, we simply use the NS_CodecPort to implement both standard and non-
standard procedures on the NS and BSSGP level. The goal of these tests is to test exactly
those NS and BSSGP implementations on the BSS (PCU) side. */
/* (C) 2018-2019 Harald Welte <laforge@gnumonks.org>
* (C) 2019 Vadim Yanitskiy <axilirator@gmail.com>
* All rights reserved.
*
* Released under the terms of GNU General Public License, Version 2 or
* (at your option) any later version.
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
import from General_Types all;
import from Osmocom_Types all;
import from GSM_Types all;
import from GSM_RR_Types all;
import from RLCMAC_CSN1_Types all;
import from RLCMAC_Types all;
import from NS_Types all;
import from BSSGP_Types all;
import from Osmocom_Gb_Types all;
import from BSSGP_Emulation all; /* BssgpConfig */
import from NS_Emulation all; /* NSConfiguration */
import from UD_Types all;
import from PCUIF_Types all;
import from PCUIF_CodecPort all;
import from PCUIF_RAW_Components all;
import from IPL4asp_Types all;
import from NS_CodecPort all;
import from NS_CodecPort_CtrlFunct all;
import from Native_Functions all;
import from PCU_Tests all;
modulepar {
charstring mp_pcu_sock_path := PCU_SOCK_DEFAULT;
}
type component RAW_NS_CT {
/* UDP port towards the bottom (IUT) */
port NS_CODEC_PT NSCP[4];
var ConnectionId g_ns_conn_id[4] := {-1, -1, -1, -1};
var NSConfiguration g_nsconfig[4];
timer g_T_guard;
}
type component RAW_PCU_CT {
/* PCUIF (we emulate the BTS part) */
port PCUIF_CODEC_PT PCU;
var ConnectionId g_pcu_conn_id := -1;
}
type component RAW_Test_CT extends RAW_NS_CT, RAW_PCU_CT {
}
private altstep as_Tguard() runs on RAW_NS_CT {
[] g_T_guard.timeout {
setverdict(fail, "Timeout of T_guard");
mtc.stop;
}
}
/* FIXME: make sure to use parameters from mp_gb_cfg.cell_id in the PCU INFO IND */
template (value) PCUIF_info_ind ts_PCUIF_INFO_default := {
version := PCU_IF_VERSION,
flags := c_PCUIF_Flags_default,
trx := valueof(ts_PCUIF_InfoTrxs_def),
bsic := 7,
mcc := 262,
mnc := 42,
mnc_3_digits := 0,
lac := 13135,
rac := 0,
nsei := mp_nsconfig.nsei,
nse_timer := { 3, 3, 3, 3, 30, 3, 10 },
cell_timer := { 3, 3, 3, 3, 3, 10, 3, 10, 3, 10, 3 },
cell_id := 20960,
repeat_time := 5 * 50,
repeat_count := 3,
bvci := mp_gb_cfg.bvci,
t3142 := 20,
t3169 := 5,
t3191 := 5,
t3193_10ms := 160,
t3195 := 5,
t3101 := 10,
t3103 := 4,
t3105 := 8,
cv_countdown := 15,
dl_tbf_ext := 250 * 10, /* ms */
ul_tbf_ext := 250 * 10, /* ms */
initial_cs := 2,
initial_mcs := 6,
nsvci := { mp_nsconfig.nsvci, 0 },
local_pprt := { mp_nsconfig.remote_udp_port, 0 },
remote_port := { mp_nsconfig.local_udp_port, 0 },
remote_ip := { f_inet_haddr(mp_nsconfig.local_ip) , '00000000'O }
}
function f_init_pcuif() runs on RAW_PCU_CT {
var PCUIF_info_ind info_ind;
map(self:PCU, system:PCU);
info_ind := valueof(ts_PCUIF_INFO_default);
/* Connect the Unix Domain Socket */
g_pcu_conn_id := f_pcuif_listen(PCU, mp_pcu_sock_path);
PCU.receive(UD_connected:?);
/* Wait for PCU_VERSION and return INFO_IND */
PCU.receive(t_SD_PCUIF(g_pcu_conn_id, tr_PCUIF_TXT_IND(0, PCU_VERSION, ?)));
/* FIXME: make sure to use parameters from mp_gb_cfg.cell_id in the PCU INFO IND */
var template PCUIF_Message info_ind_msg := ts_PCUIF_INFO_IND(0, info_ind);
PCU.send(t_SD_PCUIF(g_pcu_conn_id, info_ind_msg));
}
function f_pcuif_tx(template (value) PCUIF_Message msg) runs on RAW_PCU_CT {
PCU.send(t_SD_PCUIF(g_pcu_conn_id, msg));
}
function f_init_ns_codec(integer idx := 0, float guard_secs := 60.0) runs on RAW_NS_CT {
var Result res;
if (not g_T_guard.running) {
g_T_guard.start(guard_secs);
activate(as_Tguard());
}
if (not isbound(g_nsconfig) or not isbound(g_nsconfig[idx])) {
/* copy most parts from mp_nsconfig */
g_nsconfig[idx] := mp_nsconfig;
/* adjust those parts different for each NS-VC */
g_nsconfig[idx].nsvci := mp_nsconfig.nsvci + idx;
g_nsconfig[idx].local_udp_port := mp_nsconfig.local_udp_port + idx;
}
map(self:NSCP[idx], system:NSCP);
/* Connect the UDP socket */
log("connecting NSCP[", idx, "] to ", g_nsconfig[idx]);
res := f_IPL4_connect(NSCP[idx], g_nsconfig[idx].remote_ip, g_nsconfig[idx].remote_udp_port,
g_nsconfig[idx].local_ip, g_nsconfig[idx].local_udp_port, 0, { udp := {}});
if (not ispresent(res.connId)) {
setverdict(fail, "Could not connect NS UDP socket, check your configuration ", g_nsconfig[idx]);
mtc.stop;
}
g_ns_conn_id[idx] := res.connId;
}
function f_ns_exp(template PDU_NS exp_rx, integer idx := 0) runs on RAW_NS_CT return PDU_NS {
var NS_RecvFrom nrf;
log("f_ns_exp() expecting ", exp_rx);
alt {
[] NSCP[idx].receive(t_NS_RecvFrom(exp_rx)) -> value nrf { }
[] NSCP[idx].receive {
setverdict(fail, "Received unexpected NS: ", nrf);
mtc.stop;
}
}
return nrf.msg;
}
/* perform outbound NS-ALIVE procedure */
function f_outgoing_ns_alive(integer idx := 0) runs on RAW_NS_CT {
NSCP[idx].send(t_NS_Send(g_ns_conn_id[idx], t_NS_ALIVE));
alt {
[] NSCP[idx].receive(t_NS_RecvFrom(t_NS_ALIVE_ACK));
[] NSCP[idx].receive { repeat; }
}
}
/* perform outbound NS-ALIVE procedure */
function f_outgoing_ns_alive_no_ack(integer idx := 0, float tout := 10.0) runs on RAW_NS_CT {
timer T := tout;
NSCP[idx].send(t_NS_Send(g_ns_conn_id[idx], t_NS_ALIVE));
T.start;
alt {
[] NSCP[idx].receive(t_NS_RecvFrom(t_NS_ALIVE_ACK)) {
setverdict(fail, "Received unexpected NS-ALIVE ACK");
}
[] NSCP[idx].receive { repeat; }
[] T.timeout {
setverdict(pass);
}
}
}
/* ensure no matching message is received within 'tout' */
function f_ensure_no_ns(template PDU_NS ns := ?, integer idx := 0, float tout := 3.0)
runs on RAW_Test_CT {
timer T := tout;
T.start;
alt {
[] NSCP[idx].receive(t_NS_RecvFrom(ns)) {
setverdict(fail, "NS-ALIVE from unconfigured (possibly initial) endpoint");
}
[] T.timeout {
setverdict(pass);
}
}
}
/* perform outbound NS-BLOCK procedure */
function f_outgoing_ns_block(NsCause cause, integer idx := 0) runs on RAW_NS_CT {
NSCP[idx].send(t_NS_Send(g_ns_conn_id[idx], ts_NS_BLOCK(cause, g_nsconfig[idx].nsvci)));
alt {
[] NSCP[idx].receive(t_NS_RecvFrom(tr_NS_BLOCK_ACK(g_nsconfig[idx].nsvci)));
[] NSCP[idx].receive { repeat; }
}
}
/* receive NS-ALIVE and ACK it */
altstep as_rx_alive_tx_ack(boolean oneshot := false, integer idx := 0) runs on RAW_NS_CT {
[] NSCP[idx].receive(t_NS_RecvFrom(t_NS_ALIVE)) {
NSCP[idx].send(t_NS_Send(g_ns_conn_id[idx], t_NS_ALIVE_ACK));
if (not oneshot) { repeat; }
}
}
/* Transmit BSSGP RESET for given BVCI and expect ACK */
function f_tx_bvc_reset_rx_ack(BssgpBvci bvci, integer idx := 0, boolean exp_ack := true)
runs on RAW_NS_CT {
var PDU_BSSGP bssgp_tx := valueof(ts_BVC_RESET(BSSGP_CAUSE_NET_SV_CAP_MOD_GT_ZERO_KBPS, bvci,
mp_gb_cfg.cell_id));
timer T := 5.0;
NSCP[idx].send(t_NS_Send(g_ns_conn_id[idx], ts_NS_UNITDATA(t_SduCtrlB, 0, enc_PDU_BSSGP(bssgp_tx))));
T.start;
alt {
[exp_ack] NSCP[idx].receive(t_NS_RecvFrom(tr_NS_UNITDATA(t_SduCtrlB, 0,
decmatch tr_BVC_RESET_ACK(bvci, ?)))) {
setverdict(pass);
}
[exp_ack] T.timeout {
setverdict(fail, "No response to BVC-RESET");
}
[not exp_ack] T.timeout {
setverdict(pass);
}
[] NSCP[idx].receive { repeat; }
}
}
/* Receive a BSSGP RESET for given BVCI and ACK it */
altstep as_rx_bvc_reset_tx_ack(BssgpBvci bvci, boolean oneshot := false, integer idx := 0) runs on RAW_NS_CT {
var NS_RecvFrom ns_rf;
/* FIXME: nail down received cell_id in match */
[] NSCP[idx].receive(t_NS_RecvFrom(tr_NS_UNITDATA(t_SduCtrlB, 0,
decmatch tr_BVC_RESET(?, bvci, ?))))
-> value ns_rf {
var PDU_BSSGP bssgp_rx := dec_PDU_BSSGP(ns_rf.msg.pDU_NS_Unitdata.nS_SDU);
var PDU_BSSGP bssgp_tx := valueof(ts_BVC_RESET_ACK(bvci, mp_gb_cfg.cell_id));
NSCP[idx].send(t_NS_Send(g_ns_conn_id[idx], ts_NS_UNITDATA(t_SduCtrlB, 0, enc_PDU_BSSGP(bssgp_tx))));
if (not oneshot) { repeat; }
}
}
/* Receive a BSSGP UNBLOCK for given BVCI and ACK it */
altstep as_rx_bvc_unblock_tx_ack(BssgpBvci bvci, boolean oneshot := false, integer idx := 0) runs on RAW_NS_CT {
var NS_RecvFrom ns_rf;
[] NSCP[idx].receive(t_NS_RecvFrom(tr_NS_UNITDATA(t_SduCtrlB, 0,
decmatch t_BVC_UNBLOCK(bvci))))
-> value ns_rf {
var PDU_BSSGP bssgp_rx := dec_PDU_BSSGP(ns_rf.msg.pDU_NS_Unitdata.nS_SDU);
var PDU_BSSGP bssgp_tx := valueof(t_BVC_UNBLOCK_ACK(bvci));
NSCP[idx].send(t_NS_Send(g_ns_conn_id[idx], ts_NS_UNITDATA(t_SduCtrlB, 0, enc_PDU_BSSGP(bssgp_tx))));
if (not oneshot) { repeat; }
}
}
/* Receive a BSSGP FLOW-CONTROL-BVC and ACK it */
altstep as_rx_bvc_fc_tx_ack(BssgpBvci bvci, boolean oneshot := false, integer idx := 0) runs on RAW_NS_CT {
var NS_RecvFrom ns_rf;
[] NSCP[idx].receive(t_NS_RecvFrom(tr_NS_UNITDATA(t_SduCtrlB, bvci,
decmatch tr_BVC_FC_BVC)))
-> value ns_rf {
var PDU_BSSGP bssgp_rx := dec_PDU_BSSGP(ns_rf.msg.pDU_NS_Unitdata.nS_SDU);
var OCT1 tag := bssgp_rx.pDU_BSSGP_FLOW_CONTROL_BVC.tag.unstructured_Value;
var PDU_BSSGP bssgp_tx := valueof(t_BVC_FC_BVC_ACK(tag));
NSCP[idx].send(t_NS_Send(g_ns_conn_id[idx], ts_NS_UNITDATA(t_SduCtrlB, bvci, enc_PDU_BSSGP(bssgp_tx))));
if (not oneshot) { repeat; }
}
}
/**********************************************************************************
* Classic Gb/IP bring-up test cases using NS-{RESET,BLOCK,UNBLOCK} and no IP-SNS *
**********************************************************************************/
/* Receive a NS-RESET and ACK it */
private altstep as_rx_ns_reset_ack(boolean oneshot := false, integer idx := 0) runs on RAW_NS_CT {
var NS_RecvFrom ns_rf;
[] NSCP[idx].receive(t_NS_RecvFrom(tr_NS_RESET(NS_CAUSE_OM_INTERVENTION, g_nsconfig[idx].nsvci,
g_nsconfig[idx].nsei))) -> value ns_rf {
NSCP[idx].send(t_NS_Send(g_ns_conn_id[idx], ts_NS_RESET_ACK(g_nsconfig[idx].nsvci,
g_nsconfig[idx].nsei)));
if (not oneshot) { repeat; }
}
}
/* Receive a NS-UNBLOCK and ACK it */
private altstep as_rx_ns_unblock_ack(boolean oneshot := false, integer idx := 0) runs on RAW_NS_CT {
var NS_RecvFrom ns_rf;
[] NSCP[idx].receive(t_NS_RecvFrom(t_NS_UNBLOCK)) -> value ns_rf {
NSCP[idx].send(t_NS_Send(g_ns_conn_id[idx], t_NS_UNBLOCK_ACK));
if (not oneshot) { repeat; }
}
}
/* test the NS-RESET procedure */
testcase TC_ns_reset() runs on RAW_Test_CT {
f_init_ns_codec();
f_init_pcuif();
/* Expect inbound NS-RESET procedure */
as_rx_ns_reset_ack(oneshot := true);
setverdict(pass);
}
/* ensure NS-RESET are re-transmitted */
testcase TC_ns_reset_retrans() runs on RAW_Test_CT {
f_init_ns_codec();
f_init_pcuif();
var integer i;
for (i := 0; i < 3; i := i+1) {
NSCP[0].receive(t_NS_RecvFrom(tr_NS_RESET(NS_CAUSE_OM_INTERVENTION,
g_nsconfig[0].nsvci, g_nsconfig[0].nsei)));
}
/* Expect inbound NS-RESET procedure */
as_rx_ns_reset_ack(oneshot := true);
setverdict(pass);
}
/* test the inbound NS-ALIVE procedure after NS-RESET */
testcase TC_ns_alive() runs on RAW_Test_CT {
f_init_ns_codec();
f_init_pcuif();
/* Expect inbound NS-RESET procedure */
as_rx_ns_reset_ack(oneshot := true);
/* wait for one ALIVE cycle, then ACK any further ALIVE in the background */
as_rx_alive_tx_ack(oneshot := true);
setverdict(pass);
}
/* Test for NS-RESET after NS-ALIVE timeout */
testcase TC_ns_alive_timeout_reset() runs on RAW_Test_CT {
f_init_ns_codec(guard_secs := 100.0);
f_init_pcuif();
/* Expect inbound NS-RESET procedure */
as_rx_ns_reset_ack(oneshot := true);
/* wait for at least one NS-ALIVE */
NSCP[0].receive(t_NS_RecvFrom(t_NS_ALIVE));
/* wait for NS-RESET to re-appear, ignoring any NS-ALIVE until then */
alt {
[] as_rx_ns_reset_ack(oneshot := true) { setverdict(pass); }
[] NSCP[0].receive(t_NS_RecvFrom(t_NS_ALIVE)) { repeat; }
}
}
/* test for NS-RESET/NS-ALIVE/NS-UNBLOCK */
testcase TC_ns_unblock() runs on RAW_Test_CT {
f_init_ns_codec();
f_init_pcuif();
/* Expect inbound NS-RESET procedure */
as_rx_ns_reset_ack(oneshot := true);
/* wait for one ALIVE cycle, then ACK any further ALIVE in the background */
as_rx_alive_tx_ack(oneshot := true);
activate(as_rx_alive_tx_ack());
as_rx_ns_unblock_ack(oneshot := true);
setverdict(pass);
}
/* test for NS-UNBLOCK re-transmissions */
testcase TC_ns_unblock_retrans() runs on RAW_Test_CT {
f_init_ns_codec();
f_init_pcuif();
/* Expect inbound NS-RESET procedure */
as_rx_ns_reset_ack(oneshot := true);
/* wait for one ALIVE cycle, then ACK any further ALIVE in the background */
as_rx_alive_tx_ack(oneshot := true);
activate(as_rx_alive_tx_ack());
/* wait for first NS-UNBLOCK, don't respond */
NSCP[0].receive(t_NS_RecvFrom(t_NS_UNBLOCK));
/* wait for re-transmission of NS-UNBLOCK */
as_rx_ns_unblock_ack(oneshot := true);
setverdict(pass);
}
/* full bring-up of the Gb link for NS and BSSGP layer up to BVC-FC */
testcase TC_ns_full_bringup() runs on RAW_Test_CT {
f_init_ns_codec();
f_init_pcuif();
/* Expect inbound NS-RESET procedure */
as_rx_ns_reset_ack(oneshot := true);
/* wait for one ALIVE cycle, then ACK any further ALIVE in the background */
as_rx_alive_tx_ack(oneshot := true);
activate(as_rx_alive_tx_ack());
as_rx_ns_unblock_ack(oneshot := true);
f_outgoing_ns_alive();
/* Expect BVC-RESET for signaling (0) and ptp BVCI */
as_rx_bvc_reset_tx_ack(0, oneshot := true);
as_rx_bvc_reset_tx_ack(mp_gb_cfg.bvci, oneshot := true);
as_rx_bvc_unblock_tx_ack(mp_gb_cfg.bvci, oneshot := true);
/* wait for one FLOW-CONTROL BVC and then ACK any further in the future */
as_rx_bvc_fc_tx_ack(mp_gb_cfg.bvci, oneshot := true);
activate(as_rx_bvc_fc_tx_ack(mp_gb_cfg.bvci));
setverdict(pass);
}
/* test outbound (SGSN-originated) NS-BLOCK procedure */
testcase TC_ns_so_block() runs on RAW_Test_CT {
f_init_ns_codec();
f_init_pcuif();
/* Expect inbound NS-RESET procedure */
as_rx_ns_reset_ack(oneshot := true);
/* wait for one ALIVE cycle, then ACK any further ALIVE in the background */
as_rx_alive_tx_ack(oneshot := true);
activate(as_rx_alive_tx_ack());
as_rx_ns_unblock_ack(oneshot := true);
f_outgoing_ns_alive();
f_outgoing_ns_block(NS_CAUSE_EQUIPMENT_FAILURE);
setverdict(pass);
}
type component RAW_PCU_Test_CT extends bssgp_CT {
/* Connection to the BTS component (one for now) */
port RAW_PCU_MSG_PT BTS;
/* Connection to the PCUIF component */
port RAW_PCU_MSG_PT PCUIF;
/* Guard timeout */
timer g_T_guard := 60.0;
};
private altstep as_Tguard_RAW() runs on RAW_PCU_Test_CT {
[] g_T_guard.timeout {
setverdict(fail, "Timeout of T_guard");
mtc.stop;
}
}
private function f_init_raw(charstring id, template (value) PCUIF_info_ind info_ind := ts_PCUIF_INFO_default)
runs on RAW_PCU_Test_CT {
var RAW_PCUIF_CT vc_PCUIF;
var RAW_PCU_BTS_CT vc_BTS;
/* Start the guard timer */
g_T_guard.start;
activate(as_Tguard_RAW());
/* Init PCU interface component */
vc_PCUIF := RAW_PCUIF_CT.create("PCUIF-" & id);
connect(vc_PCUIF:MTC, self:PCUIF);
map(vc_PCUIF:PCU, system:PCU);
/* Create one BTS component (we may want more some day) */
vc_BTS := RAW_PCU_BTS_CT.create("BTS-" & id);
connect(vc_BTS:PCUIF, vc_PCUIF:BTS);
connect(vc_BTS:TC, self:BTS);
vc_PCUIF.start(f_PCUIF_CT_handler(mp_pcu_sock_path));
vc_BTS.start(f_BTS_CT_handler(0, valueof(info_ind)));
/* Wait until the BTS is ready (SI13 negotiated) */
BTS.receive(tr_RAW_PCU_EV(BTS_EV_SI13_NEGO));
}
/* FIXME: properly encode RA (see TS 24.060, table 11.2.5.2) */
private function f_establish_tbf(out GsmRrMessage rr_imm_ass, uint8_t bts_nr := 0,
uint16_t ra := oct2int('3A'O), uint8_t is_11bit := 0,
PCUIF_BurstType burst_type := BURST_TYPE_0,
TimingAdvance ta := 0)
runs on RAW_PCU_Test_CT return boolean {
var PCUIF_Message pcu_msg;
var GsmRrMessage rr_msg;
var uint32_t fn;
timer T;
/* FIXME: ask the BTS component to give us the current TDMA fn */
fn := 1337 + ta;
/* Send RACH.ind */
log("Sending RACH.ind on fn=", fn, " with RA=", ra, ", TA=", ta);
BTS.send(ts_PCUIF_RACH_IND(bts_nr := bts_nr,
ra := ra, is_11bit := is_11bit,
burst_type := burst_type,
fn := fn, arfcn := 871,
qta := ta * 4));
/* Expect Immediate (TBF) Assignment on TS0/AGCH */
T.start(2.0);
alt {
[] BTS.receive(tr_PCUIF_DATA_REQ(bts_nr := bts_nr, trx_nr := ?, ts_nr := 0,
sapi := PCU_IF_SAPI_AGCH, data := ?))
-> value pcu_msg {
rr_imm_ass := dec_GsmRrMessage(pcu_msg.u.data_req.data);
log("Rx Immediate Assignment: ", rr_imm_ass);
/* Make sure this assignment is for us
* TODO: Uplink or Downlink TBF? */
if (match(rr_imm_ass, tr_IMM_TBF_ASS(?, ra, fn))) {
setverdict(pass);
return true;
}
/* Not for us? Wait for more. */
repeat;
}
[] BTS.receive { repeat; }
[] T.timeout {
setverdict(fail, "Timeout waiting for Immediate Assignment");
}
}
return false;
}
private function f_imm_ass_verify_ul_tbf_ass(GsmRrMessage rr_imm_ass, out PacketUlAssign ul_tbf_ass)
runs on RAW_PCU_Test_CT return boolean {
/* Make sure we received an UL TBF Assignment */
if (match(rr_imm_ass, tr_IMM_TBF_ASS(dl := false, rest := tr_IaRestOctets_ULAss(?)))) {
ul_tbf_ass := rr_imm_ass.payload.imm_ass.rest_octets.hh.pa.uldl.ass.ul;
log("Rx Uplink TBF assignment: ", ul_tbf_ass);
setverdict(pass);
} else {
setverdict(fail, "Failed to match UL TBF Assignment");
return false;
}
/* Make sure we have got a TBF with Dynamic Block Allocation */
if (ul_tbf_ass.dynamic == omit) {
setverdict(fail, "Single Block Allocation is not handled by ", testcasename());
return false;
}
return true;
}
/* Enqueue DATA.ind (both TDMA frame and block numbers to be patched) */
private function f_pcuif_tx_data_ind(octetstring data, int16_t lqual_cb := 0)
runs on RAW_PCU_Test_CT {
BTS.send(ts_PCUIF_DATA_IND(bts_nr := 0, trx_nr := 0, ts_nr := 7, block_nr := 0,
sapi := PCU_IF_SAPI_PDTCH, data := data,
fn := 0, arfcn := 871, lqual_cb := lqual_cb));
BTS.receive(tr_RAW_PCU_EV(TDMA_EV_PDTCH_BLOCK_SENT));
}
/* Enqueue RTS.req, expect DATA.req with UL ACK from the PCU */
private function f_pcuif_rx_data_req(out PCUIF_Message pcu_msg)
runs on RAW_PCU_Test_CT {
BTS.send(ts_PCUIF_RTS_REQ(bts_nr := 0, trx_nr := 0, ts_nr := 7,
sapi := PCU_IF_SAPI_PDTCH, fn := 0,
arfcn := 871, block_nr := 0));
BTS.receive(tr_PCUIF_DATA_REQ(bts_nr := 0, trx_nr := 0, ts_nr := 7,
sapi := PCU_IF_SAPI_PDTCH)) -> value pcu_msg;
}
private function f_tx_rlcmac_ul_block(template (value) RlcmacUlBlock ul_data, int16_t lqual_cb := 0)
runs on RAW_PCU_Test_CT {
var octetstring data;
/* Encode the payload of DATA.ind */
data := enc_RlcmacUlBlock(valueof(ul_data));
data := f_pad_oct(data, 23, '00'O); /* CS-1 */
/* Enqueue DATA.ind (both TDMA frame and block numbers to be patched) */
f_pcuif_tx_data_ind(data, lqual_cb);
}
private function f_tx_rlcmac_ul_n_blocks(PacketUlAssign ul_tbf_ass, integer num_blocks := 1)
runs on RAW_PCU_Test_CT {
var template (value) RlcmacUlBlock ul_data := t_RLCMAC_UL_DATA(
tfi := ul_tbf_ass.dynamic.tfi_assignment,
cv := num_blocks - 1, /* num UL blocks to be sent (to be overridden in loop) */
bsn := 0, /* TODO: what should be here? */
blocks := { /* To be generated in loop */ });
/* HACK: patch missing TLLI; otherwise OsmoPCU rejects DATA.req */
ul_data.data.tlli := '00000001'O;
for (var integer i := 0; i < num_blocks; i := i + 1) {
/* Prepare a new UL block (CV, random payload) */
ul_data.data.mac_hdr.countdown := (num_blocks - i - 1);
ul_data.data.blocks := { valueof(t_RLCMAC_LLCBLOCK(f_rnd_octstring(10))) };
f_tx_rlcmac_ul_block(ul_data);
}
}
private function f_rx_rlcmac_dl_block(out RlcmacDlBlock dl_block)
runs on RAW_PCU_Test_CT {
var PCUIF_Message pcu_msg;
f_pcuif_rx_data_req(pcu_msg);
dl_block := dec_RlcmacDlBlock(pcu_msg.u.data_req.data);
}
private function f_rx_rlcmac_dl_block_exp_ack_nack(out RlcmacDlBlock dl_block)
runs on RAW_PCU_Test_CT {
f_rx_rlcmac_dl_block(dl_block);
if (not match(dl_block, tr_RLCMAC_ACK_NACK(ul_tfi := ?, tlli := ?))) {
setverdict(fail, "Failed to match Packet Uplink ACK / NACK");
mtc.stop;
}
}
private function f_rx_rlcmac_dl_block_exp_dummy(out RlcmacDlBlock dl_block)
runs on RAW_PCU_Test_CT {
f_rx_rlcmac_dl_block(dl_block);
if (not match(dl_block, tr_RLCMAC_DUMMY_CTRL())) {
setverdict(fail, "Failed to match Packet DUMMY DL");
mtc.stop;
}
}
testcase TC_pcuif_suspend() runs on RAW_PCU_Test_CT {
var octetstring ra_id := enc_RoutingAreaIdentification(mp_gb_cfg.cell_id.ra_id);
var GprsTlli tlli := 'FFFFFFFF'O;
timer T;
/* Initialize NS/BSSGP side */
f_init_bssgp();
/* Initialize the PCU interface abstraction */
f_init_raw(testcasename());
/* Establish BSSGP connection to the PCU */
f_bssgp_establish();
BTS.send(ts_PCUIF_SUSP_REQ(0, tlli, ra_id, 0));
T.start(2.0);
alt {
[] BSSGP_SIG[0].receive(tr_BSSGP_SUSPEND(tlli, mp_gb_cfg.cell_id.ra_id)) {
setverdict(pass);
}
[] T.timeout {
setverdict(fail, "Timeout waiting for BSSGP SUSPEND");
}
}
}
/* Test of correct Timing Advance at the time of TBF establishment
* (derived from timing offset of the Access Burst). */
testcase TC_ta_rach_imm_ass() runs on RAW_PCU_Test_CT {
var GsmRrMessage rr_msg;
var boolean ok;
/* Initialize the PCU interface abstraction */
f_init_raw(testcasename());
/* We cannot send too many TBF requests in a short time because
* at some point the PCU will fail to allocate a new TBF. */
for (var TimingAdvance ta := 0; ta < 64; ta := ta + 16) {
/* Establish an Uplink TBF (send RACH.ind with current TA) */
ok := f_establish_tbf(rr_msg, bts_nr := 0, ta := ta);
if (not ok) {
setverdict(fail, "Failed to establish an Uplink TBF");
mtc.stop;
}
/* Make sure Timing Advance IE matches out expectations */
if (match(rr_msg, tr_IMM_TBF_ASS(dl := false, ta := ta))) {
setverdict(pass);
}
}
}
/* Verify that the PCU generates valid PTCCH/D messages
* while neither Uplink nor Downlink TBF is established. */
testcase TC_ta_ptcch_idle() runs on RAW_PCU_Test_CT {
var PTCCHDownlinkMsg ptcch_msg;
var PCUIF_Message pcu_msg;
timer T;
/* Initialize the PCU interface abstraction */
f_init_raw(testcasename());
/* Sent an RTS.req for PTCCH/D */
BTS.send(ts_PCUIF_RTS_REQ(bts_nr := 0, trx_nr := 0, ts_nr := 7,
sapi := PCU_IF_SAPI_PTCCH, fn := 0,
arfcn := 871, block_nr := 0));
T.start(5.0);
alt {
[] BTS.receive(tr_PCUIF_DATA_REQ(bts_nr := 0, trx_nr := 0, ts_nr := 7,
sapi := PCU_IF_SAPI_PTCCH)) -> value pcu_msg {
log("Rx DATA.req message: ", pcu_msg);
setverdict(pass);
}
[] BTS.receive(PCUIF_Message:?) { repeat; }
[] T.timeout {
setverdict(fail, "Timeout waiting for a PTCCH/D block");
mtc.stop;
}
}
ptcch_msg := dec_PTCCHDownlinkMsg(pcu_msg.u.data_req.data);
log("Decoded PTCCH/D message: ", ptcch_msg);
/* Make sure the message is encoded correctly
* TODO: do we expect all TA values to be equal '1111111'B? */
if (not match(ptcch_msg, tr_PTCCHDownlinkMsg)) {
setverdict(fail, "Malformed PTCCH/D message");
mtc.stop;
}
}
/* Test of correct Timing Advance during an active Uplink TBF.
*
* Unlike the circuit-switched domain, Uplink transmissions on PDCH time-slots
* are not continuous and there can be long time gaps between them. This happens
* due to a bursty nature of packet data. The actual Timing Advance of a MS may
* significantly change between such rare Uplink transmissions, so GPRS introduces
* additional mechanisms to control Timing Advance, and thus reduce interference
* between neighboring TDMA time-slots.
*
* At the moment of Uplink TBF establishment, initial Timing Advance is measured
* from ToA (Timing of Arrival) of an Access Burst. This is covered by another
* test case - TC_ta_rach_imm_ass. In response to that Access Burst the network
* sends Immediate Assignment on AGCH, which _may_ contain Timing Advance Index
* among with the initial Timing Advance value. And here PTCCH comes to play.
*
* PTCCH is a unidirectional channel on which the network can instruct a sub-set
* of 16 MS (whether TBFs are active or not) to adjust their Timing Advance
* continuously. To ensure continuous measurements of the signal propagation
* delay, the MSs shall transmit Access Bursts on Uplink (PTCCH/U) on sub-slots
* defined by an assigned Timing Advance Index (see 3GPP TS 45.002).
*
* The purpose of this test case is to verify the assignment of Timing Advance
* Index, and the process of Timing Advance notification on PTCCH/D. The MTC
* first establishes several Uplink TBFs, but does not transmit any Uplink
* blocks on them. During 4 TDMA multi-frame periods the MTC is sending RACH
* indications to the PCU, checking the correctness of two received PTCCH/D
* messages (period of PTCCH/D is two multi-frames).
*/
/* List of ToA values for Access Bursts to be sent on PTCCH/U,
* each ToA (Timing of Arrival) value is in units of 1/4 of
* a symbol (i.e. 1 symbol is 4 QTA units). */
type record length(16) of int16_t PTCCH_TAI_ToA_MAP;
const PTCCH_TAI_ToA_MAP ptcch_toa_map_def := {
0, 0, 0, 0,
0, 0, 0, 0,
0, 0, 0, 0,
0, 0, 0, 0
};
private altstep as_ta_ptcch(uint8_t bts_nr := 0, /* TODO: TRX / TS number */
in PTCCH_TAI_ToA_MAP toa_map := ptcch_toa_map_def)
runs on RAW_PCU_Test_CT {
var RAW_PCU_Event event;
var integer ss;
/* Send Access Bursts on PTCCH/U for every TA Index */
[] BTS.receive(tr_RAW_PCU_EV(TDMA_EV_PTCCH_UL_BURST)) -> value event {
ss := f_tdma_ptcch_fn2ss(event.data.tdma_fn);
if (ss < 0) { mtc.stop; } /* Shall not happen */
log("Sending an Access Burst on PTCCH/U",
", sub-slot=", ss, " (TAI)",
", fn=", event.data.tdma_fn,
", ToA=", toa_map[ss], " (QTA)");
/* TODO: do we care about RA and burst format? */
BTS.send(ts_PCUIF_RACH_IND(bts_nr := bts_nr,
ra := oct2int('3A'O),
is_11bit := 0,
burst_type := BURST_TYPE_0,
fn := event.data.tdma_fn,
arfcn := 871,
qta := toa_map[ss],
sapi := PCU_IF_SAPI_PTCCH));
repeat;
}
}
private function f_TC_ta_ptcch_ul_multi_tbf(in PTCCH_TAI_ToA_MAP ptcch_toa_map,
template PTCCHDownlinkMsg t_ta_msg)
runs on RAW_PCU_Test_CT {
var PTCCHDownlinkMsg ta_msg;
var PCUIF_Message pcu_msg;
timer T;
/* First, send an RTS.req for the upcoming PTCCH/D block */
BTS.send(ts_PCUIF_RTS_REQ(bts_nr := 0, trx_nr := 0, ts_nr := 7,
sapi := PCU_IF_SAPI_PTCCH, fn := 0,
arfcn := 871, block_nr := 0));
T.start(2.0);
alt {
/* Keep sending of Access Bursts during two multi-frames (period of PTCCH/D)
* with increasing ToA (Timing of Arrival) values: 0, 7, 14, 28, 35... */
[] as_ta_ptcch(bts_nr := 0, toa_map := ptcch_toa_map);
/* In the end of 2nd multi-frame we should receive a PTCCH/D block */
[] BTS.receive(tr_PCUIF_DATA_REQ(bts_nr := 0, trx_nr := 0, ts_nr := 7,
sapi := PCU_IF_SAPI_PTCCH)) -> value pcu_msg {
ta_msg := dec_PTCCHDownlinkMsg(pcu_msg.u.data_req.data);
log("Rx PTCCH/D message: ", ta_msg);
/* Make sure Timing Advance values match our expectations */
if (match(ta_msg, t_ta_msg)) {
setverdict(pass);
} else {
setverdict(fail, "PTCCH/D message does not match: ", t_ta_msg);
}
}
[] BTS.receive { repeat; }
[] T.timeout {
setverdict(fail, "Timeout waiting for a PTCCH/D block");
mtc.stop;
}
}
}
testcase TC_ta_ptcch_ul_multi_tbf() runs on RAW_PCU_Test_CT {
var template PacketUlAssign t_ul_tbf_ass;
var PacketUlAssign ul_tbf_ass[7];
var GsmRrMessage rr_msg[7];
var boolean ok;
/* Initialize the PCU interface abstraction */
f_init_raw(testcasename());
/* Enable forwarding of PTCCH/U TDMA events to us */
BTS.send(ts_RAW_PCU_CMD(TDMA_CMD_ENABLE_PTCCH_UL_FWD));
/* Establish 7 Uplink TBFs (USF flag is 3 bits long, '111'B is reserved) */
for (var integer i := 0; i < 7; i := i + 1) {
ok := f_establish_tbf(rr_msg[i], ta := 0);
if (not ok) {
setverdict(fail, "Failed to establish an Uplink TBF #", i);
mtc.stop;
}
/* Make sure we received an UL TBF Assignment */
if (match(rr_msg[i], tr_IMM_TBF_ASS(dl := false, rest := tr_IaRestOctets_ULAss(?)))) {
ul_tbf_ass[i] := rr_msg[i].payload.imm_ass.rest_octets.hh.pa.uldl.ass.ul;
log("Rx Uplink TBF assignment for #", i, ": ", ul_tbf_ass[i]);
} else {
setverdict(fail, "Failed to match UL TBF Assignment for #", i);
mtc.stop;
}
/* We expect incremental TFI/USF assignment (dynamic allocation) */
t_ul_tbf_ass := tr_PacketUlDynAssign(tfi := i, usf := i);
if (not match(ul_tbf_ass[i], t_ul_tbf_ass)) {
setverdict(fail, "Failed to match Packet Uplink Assignment for #", i);
mtc.stop;
}
/* We also expect Timing Advance Index to be a part of the assignment */
if (ul_tbf_ass[i].dynamic.ta_index != i) {
setverdict(fail, "Failed to match Timing Advance Index for #", i);
/* Keep going, the current OsmoPCU does not assign TA Index */
}
}
/* Prepare a list of ToA values for Access Bursts to be sent on PTCCH/U */
var PTCCH_TAI_ToA_MAP toa_map := ptcch_toa_map_def;
for (var integer i := 0; i < 7; i := i + 1) {
/* ToA in units of 1/4 of a symbol */
toa_map[i] := (i + 1) * 7 * 4;
}
/* Now we have all 7 TBFs established in one-phase access mode,
* however we will not be sending any data on them. Instead, we
* will be sending RACH.ind on PTCCH/U during 4 multi-frame
* periods (TAI 0..8), and then will check two PTCCH/D blocks.
*
* Why not 4 TBFs at once? Because Uplink is delayed by 3 TDMA
* time-slots, so at the moment of scheduling a PTCCH/D block
* the PCU has odd number of PTCCH/U Access Bursts received. */
f_TC_ta_ptcch_ul_multi_tbf(toa_map, tr_PTCCHDownlinkMsg(
tai0_ta := 7, tai1_ta := 14, tai2_ta := 21,
/* Other values are not known (yet) */
tai3_ta := ?));
f_TC_ta_ptcch_ul_multi_tbf(toa_map, tr_PTCCHDownlinkMsg(
tai0_ta := 7, tai1_ta := 14, tai2_ta := 21,
tai3_ta := 28, tai4_ta := 35, tai5_ta := 42,
/* Other values are out of our interest */
tai6_ta := ?));
}
/* Default link quality adaptation (Coding Scheme) ranges:
/* CS1: ... 6 dB, CS2: 5 .. 8 dB, CS3: 7 .. 13 db, CS4: 12 ... dB */
private template integer CS1_lqual_dB_range := (-infinity .. 6);
private template integer CS2_lqual_dB_range := (5 .. 8);
private template integer CS3_lqual_dB_range := (7 .. 13);
private template integer CS4_lqual_dB_range := (12 .. infinity);
testcase TC_cs_lqual_ul_tbf() runs on RAW_PCU_Test_CT {
var GsmRrMessage rr_imm_ass;
var PacketUlAssign ul_tbf_ass;
var RlcmacDlBlock dl_block;
var PCUIF_Message pcu_msg;
var octetstring data;
var boolean ok;
/* Initialize the PCU interface abstraction */
f_init_raw(testcasename());
/* Establish an Uplink TBF */
ok := f_establish_tbf(rr_imm_ass);
if (not ok) {
setverdict(fail, "Failed to establish TBF");
mtc.stop;
}
ok := f_imm_ass_verify_ul_tbf_ass(rr_imm_ass, ul_tbf_ass);
if (not ok) {
setverdict(fail, "Immediate Assignment not an Uplink TBF");
mtc.stop;
}
var template (value) RlcmacUlBlock ul_data := t_RLCMAC_UL_DATA(
tfi := ul_tbf_ass.dynamic.tfi_assignment,
cv := 15, /* 15 UL blocks to be sent (to be overridden in loop) */
bsn := 0, /* TODO: what should be here? */
blocks := { /* To be generated in loop */ });
/* HACK: patch missing TLLI; otherwise OsmoPCU rejects DATA.req */
ul_data.data.tlli := '00000001'O;
/* 16 UL blocks (0 .. 32 dB, step = 2 dB) */
for (var integer i := 0; i < 16; i := i + 1) {
/* Prepare a new UL block (CV, random payload) */
ul_data.data.mac_hdr.countdown := (15 - i);
ul_data.data.blocks := { valueof(t_RLCMAC_LLCBLOCK(f_rnd_octstring(10))) };
/* Link quality in dB and our CS1-4 expectations */
var integer lqual := i * 2;
/* Enqueue DATA.ind (both TDMA frame and block numbers to be patched) */
log("Sending DATA.ind with link quality (dB): ", lqual);
f_tx_rlcmac_ul_block(ul_data, lqual * 10);
/* Enqueue RTS.req, expect DATA.req with UL ACK from the PCU */
f_rx_rlcmac_dl_block_exp_ack_nack(dl_block);
log("Rx Packet Uplink ACK / NACK with Channel Coding Command: ",
dl_block.ctrl.payload.u.ul_ack_nack.gprs.ch_coding_cmd);
/* Match the received Channel Coding Command */
var template ChCodingCommand ch_coding;
select (lqual) {
case (CS1_lqual_dB_range) { ch_coding := CH_CODING_CS1; }
case (CS2_lqual_dB_range) { ch_coding := CH_CODING_CS2; }
case (CS3_lqual_dB_range) { ch_coding := CH_CODING_CS3; }
case (CS4_lqual_dB_range) { ch_coding := CH_CODING_CS4; }
}
if (not match(dl_block.ctrl.payload.u.ul_ack_nack.gprs.ch_coding_cmd, ch_coding)) {
setverdict(fail, "Channel Coding does not match our expectations: ", ch_coding);
} else {
setverdict(pass);
}
}
}
/* Verify PCU drops TBF after some time of inactivity. */
testcase TC_t3169() runs on RAW_PCU_Test_CT {
var PCUIF_info_ind info_ind;
var GsmRrMessage rr_imm_ass;
var PacketUlAssign ul_tbf_ass;
var RlcmacDlBlock dl_block;
var PCUIF_Message pcu_msg;
var octetstring data;
var boolean ok;
var OCT4 tlli := '00000001'O;
/* Initialize NS/BSSGP side */
f_init_bssgp();
info_ind := valueof(ts_PCUIF_INFO_default);
/* Set timer to 1 sec (default 5) to speedup test: */
info_ind.t3169 := 1;
/* Initialize the PCU interface abstraction */
f_init_raw(testcasename(), info_ind);
/* Establish BSSGP connection to the PCU */
f_bssgp_establish();
f_bssgp_client_llgmm_assign('FFFFFFFF'O, tlli);
/* Establish an Uplink TBF */
ok := f_establish_tbf(rr_imm_ass);
if (not ok) {
setverdict(fail, "Failed to establish TBF");
mtc.stop;
}
ok := f_imm_ass_verify_ul_tbf_ass(rr_imm_ass, ul_tbf_ass);
if (not ok) {
setverdict(fail, "Immediate Assignment not an Uplink TBF");
mtc.stop;
}
/* Send one UL block and make sure it is ACKED fine */
f_tx_rlcmac_ul_n_blocks(ul_tbf_ass, 1);
f_rx_rlcmac_dl_block_exp_ack_nack(dl_block);
/* UL block should be received in SGSN */
BSSGP[0].receive(tr_BSSGP_UL_UD(tlli, mp_gb_cfg.cell_id));
/* Wait until T3169 fires (plus 1 extra sec to make sure) */
f_sleep(int2float(info_ind.t3169) + 1.0);
/* Send an UL block once again, the TBF should be gone by now so no ACK */
f_tx_rlcmac_ul_n_blocks(ul_tbf_ass, 1);
f_rx_rlcmac_dl_block_exp_dummy(dl_block);
}
control {
execute( TC_ns_reset() );
execute( TC_ns_reset_retrans() );
execute( TC_ns_alive() );
execute( TC_ns_alive_timeout_reset() );
execute( TC_ns_unblock() );
execute( TC_ns_unblock_retrans() );
execute( TC_ns_full_bringup() );
execute( TC_ns_so_block() );
execute( TC_pcuif_suspend() );
execute( TC_ta_ptcch_idle() );
execute( TC_ta_rach_imm_ass() );
execute( TC_ta_ptcch_ul_multi_tbf() );
execute( TC_cs_lqual_ul_tbf() );
execute( TC_t3169() );
}
}
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