From a416cb8afe6839e6d533178d1e96301b43411c7f Mon Sep 17 00:00:00 2001 From: Pau Espin Pedrol Date: Fri, 15 May 2020 14:09:02 +0200 Subject: 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 --- pcu/PCU_Tests.ttcn | 95 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 95 insertions(+) diff --git a/pcu/PCU_Tests.ttcn b/pcu/PCU_Tests.ttcn index a87396c4..43ed7c5d 100644 --- a/pcu/PCU_Tests.ttcn +++ b/pcu/PCU_Tests.ttcn @@ -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() ); -- cgit v1.2.3