From 70c3915d814d4d0891960926b22fe2966a40a3df Mon Sep 17 00:00:00 2001 From: Robert Schmidt Date: Wed, 25 Nov 2020 10:09:17 +0100 Subject: [PATCH] Schedule PRACH (internally) one frame in advance --- openair2/LAYER2/NR_MAC_gNB/gNB_scheduler.c | 14 ++++++++++++-- openair2/LAYER2/NR_MAC_gNB/gNB_scheduler_RA.c | 2 +- 2 files changed, 13 insertions(+), 3 deletions(-) diff --git a/openair2/LAYER2/NR_MAC_gNB/gNB_scheduler.c b/openair2/LAYER2/NR_MAC_gNB/gNB_scheduler.c index f443854e41..fb1c602dbb 100644 --- a/openair2/LAYER2/NR_MAC_gNB/gNB_scheduler.c +++ b/openair2/LAYER2/NR_MAC_gNB/gNB_scheduler.c @@ -397,8 +397,18 @@ void gNB_dlsch_ulsch_scheduler(module_id_t module_idP, schedule_nr_mib(module_idP, frame, slot, slots_per_frame[*scc->ssbSubcarrierSpacing]); // This schedule PRACH if we are not in phy_test mode - if (get_softmodem_params()->phy_test == 0) - schedule_nr_prach(module_idP, frame, slot); + if (get_softmodem_params()->phy_test == 0) { + /* we need to make sure that resources for PRACH are free. To avoid that + e.g. PUSCH has already been scheduled, make sure we schedule before + anything else: below, we simply assume an advance one frame (minus one + slot, because otherwise we would allocate the current slot in + UL_tti_req_ahead), but be aware that, e.g., K2 is allowed to be larger + (schedule_nr_prach will assert if resources are not free). */ + const sub_frame_t n_slots_ahead = slots_per_frame[*scc->ssbSubcarrierSpacing] - 1; + const frame_t f = (frame + (slot + n_slots_ahead) / slots_per_frame[*scc->ssbSubcarrierSpacing]) % 1024; + const sub_frame_t s = (slot + n_slots_ahead) % slots_per_frame[*scc->ssbSubcarrierSpacing]; + schedule_nr_prach(module_idP, f, s); + } // This schedule SR // TODO diff --git a/openair2/LAYER2/NR_MAC_gNB/gNB_scheduler_RA.c b/openair2/LAYER2/NR_MAC_gNB/gNB_scheduler_RA.c index 8ec4b6d8d7..1ef342cac8 100644 --- a/openair2/LAYER2/NR_MAC_gNB/gNB_scheduler_RA.c +++ b/openair2/LAYER2/NR_MAC_gNB/gNB_scheduler_RA.c @@ -200,7 +200,7 @@ void schedule_nr_prach(module_id_t module_idP, frame_t frameP, sub_frame_t slotP gNB_MAC_INST *gNB = RC.nrmac[module_idP]; NR_COMMON_channels_t *cc = gNB->common_channels; NR_ServingCellConfigCommon_t *scc = cc->ServingCellConfigCommon; - nfapi_nr_ul_tti_request_t *UL_tti_req = RC.nrmac[module_idP]->UL_tti_req[0]; + nfapi_nr_ul_tti_request_t *UL_tti_req = &RC.nrmac[module_idP]->UL_tti_req_ahead[0][slotP]; nfapi_nr_config_request_scf_t *cfg = &RC.nrmac[module_idP]->config[0]; if (is_nr_UL_slot(scc,slotP)) {