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srsRAN_4G
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changed the RAR schedule to support the allocation of nof_grants lower than the current nof_grants in the queue with same ra-rnti

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master
Francisco Paisana 5 years ago committed by Francisco Paisana
parent e9ca6e3d52
commit de195e9521
3 changed files with 61 additions and 36 deletions
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6
srsenb/hdr/stack/mac/scheduler_grid.h
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@ -235,9 +235,9 @@ public:
void new_tti(uint32_t tti_rx_, uint32_t start_cfi); void new_tti(uint32_t tti_rx_, uint32_t start_cfi);
// DL alloc // DL alloc
alloc_outcome_t alloc_bc(uint32_t aggr_lvl, uint32_t sib_idx, uint32_t sib_ntx); alloc_outcome_t alloc_bc(uint32_t aggr_lvl, uint32_t sib_idx, uint32_t sib_ntx);
alloc_outcome_t alloc_paging(uint32_t aggr_lvl, uint32_t paging_payload); alloc_outcome_t alloc_paging(uint32_t aggr_lvl, uint32_t paging_payload);
alloc_outcome_t alloc_rar(uint32_t aggr_lvl, const pending_rar_t& rar_grant); std::pair<alloc_outcome_t, uint32_t> alloc_rar(uint32_t aggr_lvl, const pending_rar_t& rar_grant);
// UL alloc // UL alloc
alloc_outcome_t alloc_msg3(const pending_msg3_t& msg3); alloc_outcome_t alloc_msg3(const pending_msg3_t& msg3);

20
srsenb/src/stack/mac/scheduler_carrier.cc
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@ -173,15 +173,23 @@ void ra_sched::dl_sched(srsenb::sf_sched* tti_sched)
} }
// Try to schedule DCI + RBGs for RAR Grant // Try to schedule DCI + RBGs for RAR Grant
alloc_outcome_t ret = tti_sched->alloc_rar(rar_aggr_level, rar); std::pair<alloc_outcome_t, uint32_t> ret = tti_sched->alloc_rar(rar_aggr_level, rar);
// If we can allocate, schedule Msg3 and remove from pending if (ret.first == alloc_outcome_t::SUCCESS) {
if (not ret) { // if all RAR grant allocations were successful
if (ret.second == rar.nof_grants) {
// Remove pending RAR
pending_rars.pop_front();
} else if (ret.second > 0) {
// keep the RAR grants that were not scheduled, so we can schedule in next TTI
std::copy(&rar.msg3_grant[ret.second], &rar.msg3_grant[rar.nof_grants], &rar.msg3_grant[0]);
rar.nof_grants -= ret.second;
}
} else if (ret.first == alloc_outcome_t::RB_COLLISION) {
// there are not enough RBs for RAR or Msg3 allocation. We can skip this TTI
return; return;
} }
// try to scheduler next RAR with different RA-RNTI
// Remove pending RAR
pending_rars.pop_front();
} }
} }

71
srsenb/src/stack/mac/scheduler_grid.cc
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@ -502,40 +502,57 @@ alloc_outcome_t sf_sched::alloc_paging(uint32_t aggr_lvl, uint32_t paging_payloa
return ret.first; return ret.first;
} }
alloc_outcome_t sf_sched::alloc_rar(uint32_t aggr_lvl, const pending_rar_t& rar) std::pair<alloc_outcome_t, uint32_t> sf_sched::alloc_rar(uint32_t aggr_lvl, const pending_rar_t& rar)
{ {
uint32_t buf_rar = 7 * rar.nof_grants + 1; // 1+6 bytes per RAR subheader+body and 1 byte for Backoff const uint32_t msg3_grant_size = 3;
uint32_t msg3_grant_size = 3; std::pair<alloc_outcome_t, uint32_t> ret = {alloc_outcome_t::ERROR, 0};
uint32_t total_msg3_size = msg3_grant_size * rar.nof_grants;
// check if there is enough space for Msg3 for (uint32_t nof_grants = rar.nof_grants; nof_grants > 0; nof_grants--) {
if (last_msg3_prb + total_msg3_size > sched_params->cfg->cell.nof_prb - sched_params->cfg->nrb_pucch) { uint32_t buf_rar = 7 * nof_grants + 1; // 1+6 bytes per RAR subheader+body and 1 byte for Backoff
return alloc_outcome_t::RB_COLLISION; uint32_t total_msg3_size = msg3_grant_size * nof_grants;
} uint32_t msg3_prb_attempt = last_msg3_prb;
// allocate RBs and PDCCH // check if there is enough space for Msg3, try again with a lower number of grants
sf_sched::ctrl_code_t ret = alloc_dl_ctrl(aggr_lvl, buf_rar, rar.ra_rnti); if (msg3_prb_attempt + total_msg3_size > sched_params->cfg->cell.nof_prb - sched_params->cfg->nrb_pucch) {
if (not ret.first) { ret.first = alloc_outcome_t::RB_COLLISION;
log_h->warning("SCHED: Could not allocate RAR for L=%d, cause=%s\n", aggr_lvl, ret.first.to_string()); continue;
return ret.first; }
}
// RAR allocation successful // allocate RBs and PDCCH
sched_interface::dl_sched_rar_t rar_grant = {}; sf_sched::ctrl_code_t ret2 = alloc_dl_ctrl(aggr_lvl, buf_rar, rar.ra_rnti);
rar_grant.nof_grants = rar.nof_grants; ret.first = ret2.first.result;
for (uint32_t i = 0; i < rar.nof_grants; ++i) { ret.second = nof_grants;
rar_grant.msg3_grant[i].data = rar.msg3_grant[i];
rar_grant.msg3_grant[i].grant.tpc_pusch = 3;
rar_grant.msg3_grant[i].grant.trunc_mcs = 0;
uint32_t rba = srslte_ra_type2_to_riv(msg3_grant_size, last_msg3_prb, sched_params->cfg->cell.nof_prb);
rar_grant.msg3_grant[i].grant.rba = rba;
last_msg3_prb += msg3_grant_size; // if there was no space for the RAR, try again
} if (ret.first == alloc_outcome_t::RB_COLLISION) {
continue;
}
// if any other error, return
if (ret.first != alloc_outcome_t::SUCCESS) {
log_h->warning("SCHED: Could not allocate RAR for L=%d, cause=%s\n", aggr_lvl, ret.first.to_string());
return ret;
}
rar_allocs.emplace_back(ret.second, rar_grant); // RAR allocation successful
sched_interface::dl_sched_rar_t rar_grant = {};
rar_grant.nof_grants = nof_grants;
for (uint32_t i = 0; i < nof_grants; ++i) {
rar_grant.msg3_grant[i].data = rar.msg3_grant[i];
rar_grant.msg3_grant[i].grant.tpc_pusch = 3;
rar_grant.msg3_grant[i].grant.trunc_mcs = 0;
uint32_t rba = srslte_ra_type2_to_riv(msg3_grant_size, msg3_prb_attempt, sched_params->cfg->cell.nof_prb);
rar_grant.msg3_grant[i].grant.rba = rba;
msg3_prb_attempt += msg3_grant_size;
}
return ret.first; rar_allocs.emplace_back(ret2.second, rar_grant);
break;
}
if (ret.first != alloc_outcome_t::SUCCESS) {
log_h->warning("SCHED: Failed to allocate RAR due to lack of RBs\n");
}
return ret;
} }
alloc_outcome_t sf_sched::alloc_dl_user(sched_ue* user, const rbgmask_t& user_mask, uint32_t pid) alloc_outcome_t sf_sched::alloc_dl_user(sched_ue* user, const rbgmask_t& user_mask, uint32_t pid)

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