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osmo-ttcn3-hacks
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Introduce test TC_ul_intermediate_retrans 

Test Verifies that if PCU doesn't get one of the intermediate UL data blocks in a UL
TBF, it will request retransmission through UL ACK/NACK (with missing block
in its bitmap) when CV=0 is received (and hence it knows no more data is to be
transferred).

This test fails as of current osmo-pcu master, and it's fixed there by
osmo-pcu.git Change-Id I9b4ef7b7277efa645bdb5becf2e9f6b32c99a9b1.

Change-Id: I204a470e47fcc5965de758ad9a275837e0c8034d
This commit is contained in:
Pau Espin 2020-05-15 14:09:02 +02:00
parent 487d634726
commit a416cb8afe
1 changed files with 95 additions and 0 deletions
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95
pcu/PCU_Tests.ttcn
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@ -1787,6 +1787,100 @@ testcase TC_mt_ping_pong_with_dl_racap() runs on RAW_PCU_Test_CT {
f_TC_mt_ping_pong(ms_racap, exp_cs_mcs);
}
/* Verify that if PCU doesn't get one of the intermediate UL data blocks in a UL
* TBF, it will request retransmission through UL ACK/NACK (with missing block
* in its bitmap) when CV=0 is received (and hence it knows no more data is to
* be transferred).
*/
testcase TC_ul_intermediate_retrans() runs on RAW_PCU_Test_CT {
var GsmRrMessage rr_imm_ass;
var PacketUlAssign ul_tbf_ass;
var RlcmacDlBlock dl_block;
var template (value) RlcmacUlBlock ul_data;
var boolean ok;
var uint32_t sched_fn;
var OCT4 tlli := '00000001'O;
var uint14_t bsn := 5;
var PDU_BSSGP bssgp_pdu;
var octetstring total_payload;
var octetstring payload;
var octetstring lost_payload;
var integer padding_len;
var uint5_t tfi;
/* 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();
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");
f_shutdown(__BFILE__, __LINE__);
}
/* Make sure we've got an Uplink TBF assignment */
f_imm_ass_verify_ul_tbf_ass(rr_imm_ass, ul_tbf_ass);
tfi := ul_tbf_ass.dynamic.tfi_assignment;
/* Send one UL block (with TLLI since we are in One-Phase Access
contention resoultion) and make sure it is ACKED fine. */
payload := f_rnd_octstring(16); /* 16 bytes fills the llc block (because TLLI takes 4 bytes) */
ul_data := t_RLCMAC_UL_DATA_TLLI(
tfi := tfi,
cv := 15, /* Set CV = 15 to signal there's still more than BS_CV_MAX blocks to be sent */
bsn := 0,
blocks := { valueof(t_RLCMAC_LLCBLOCK(payload)) },
tlli := tlli);
f_tx_rlcmac_ul_block(ul_data, 0);
f_rx_rlcmac_dl_block_exp_ack_nack(dl_block, sched_fn);
/* DL ACK/NACK sets poll+rrbp requesting PACKET CONTROL ACK */
f_tx_rlcmac_ul_block(ts_RLCMAC_CTRL_ACK(tlli), 0, sched_fn);
total_payload := payload;
/* Send 2 packets, skip 1 (inc bsn) and send another one */
payload := f_rnd_octstring(20); /* 20 bytes fills the CS-1 llc block */
ul_data := t_RLCMAC_UL_DATA(tfi := tfi, cv := 15, bsn := 1, blocks := {t_RLCMAC_LLCBLOCK(payload)});
f_tx_rlcmac_ul_block(ul_data, 0);
total_payload := total_payload & payload;
payload := f_rnd_octstring(20); /* 20 bytes fills the CS-1 llc block */
ul_data := t_RLCMAC_UL_DATA(tfi := tfi, cv := 15, bsn := 2, blocks := {t_RLCMAC_LLCBLOCK(payload)});
f_tx_rlcmac_ul_block(ul_data, 0);
total_payload := total_payload & payload;
lost_payload := f_rnd_octstring(20); /* LOST PAYLOAD bsn=3, will be retransmitted, next bsn is increased +2 */
total_payload := total_payload & lost_payload;
payload := f_rnd_octstring(20); /* 20 bytes fills the CS-1 llc block */
ul_data := t_RLCMAC_UL_DATA(tfi := tfi, cv := 15, bsn := 4, blocks := {t_RLCMAC_LLCBLOCK(payload)});
f_tx_rlcmac_ul_block(ul_data, 0);
total_payload := total_payload & payload;
/* Send enough blocks to finish the transmission (since we were sending BSN=15, send BS_CV_MAX packets) */
total_payload := total_payload & f_tx_rlcmac_ul_n_blocks(ul_tbf_ass.dynamic.tfi_assignment, bsn, g_bs_cv_max);
/* On CV=0, we'll receive a UL ACK asking about missing block */
f_rx_rlcmac_dl_block_exp_ack_nack(dl_block, sched_fn);
/* TODO: check ack ack bitmap (URBB) */
ul_data := t_RLCMAC_UL_DATA(tfi := tfi, cv := 15, bsn := 3, blocks := {t_RLCMAC_LLCBLOCK(lost_payload)});
f_tx_rlcmac_ul_block(ul_data, 0);
/* Now final ack is recieved */
f_rx_rlcmac_dl_block_exp_ack_nack(dl_block, sched_fn);
/* DL ACK/NACK sets poll+rrbp requesting PACKET CONTROL ACK */
f_tx_rlcmac_ul_block(ts_RLCMAC_CTRL_ACK(tlli), 0, sched_fn);
/* receive one message on BSSGP with all aggregated data in payload: */
BSSGP[0].receive(tr_BSSGP_UL_UD(tlli, mp_gb_cfg.cell_id, total_payload));
}
/* Verify that if PCU doesn't get an ACK for first DL block after IMM ASS, it
* will retry by retransmitting both the IMM ASS + DL block after poll (ack)
* timeout occurs (specified by sent RRBP on DL block). */
@ -2252,6 +2346,7 @@ control {
execute( TC_force_two_phase_access() );
execute( TC_mt_ping_pong() );
execute( TC_mt_ping_pong_with_dl_racap() );
execute (TC_ul_intermediate_retrans() );
execute( TC_imm_ass_dl_block_retrans() );
execute( TC_dl_flow_more_blocks() );
execute( TC_paging_cs_from_bts() );