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srsLTE
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Fixed bug with UL adaptive retx

This commit is contained in:
Ismael Gomez 2017-11-10 17:59:35 +01:00
parent 05973790ba
commit 42d08046d3
3 changed files with 20 additions and 13 deletions
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1
lib/include/srslte/common/common.h
View File

@ -46,6 +46,7 @@
#define HARQ_DELAY_MS 4
#define MSG3_DELAY_MS 2 // Delay added to HARQ_DELAY_MS
#define TTI_RX(tti) (tti>HARQ_DELAY_MS?((tti-HARQ_DELAY_MS)%10240):(10240+tti-HARQ_DELAY_MS))
#define TTI_TX(tti) ((tti+HARQ_DELAY_MS)%10240)
#define TTI_RX_ACK(tti) ((tti+(2*HARQ_DELAY_MS))%10240)

6
srsue/hdr/mac/ul_harq.h
View File

@ -219,7 +219,7 @@ private:
// Receive and route HARQ feedbacks
if (grant) {
if ((!(grant->rnti_type == SRSLTE_RNTI_TEMP) && grant->ndi[0] != get_ndi()) ||
if ((!(grant->rnti_type == SRSLTE_RNTI_TEMP) && grant->ndi[0] != get_ndi() && grant->phy_grant.ul.mcs.idx < 29) ||
(grant->rnti_type == SRSLTE_RNTI_USER && !has_grant()) ||
grant->is_from_rar)
{
@ -245,7 +245,7 @@ private:
Warning("Uplink grant but no MAC PDU in Multiplex Unit buffer\n");
}
}
} else {
} else if (has_grant()) {
// Adaptive Re-TX
if (current_tx_nb >= max_retx) {
Info("UL %d: Maximum number of ReTX reached (%d). Discarting TB.\n", pid, max_retx);
@ -254,6 +254,8 @@ private:
} else {
generate_retx(tti_tx, grant, action);
}
} else {
Warning("UL %d: Received mcs=%d but no previous grant available for this PID.\n", pid, grant->phy_grant.ul.mcs.idx);
}
} else if (has_grant()) {
// Non-Adaptive Re-Tx

26
srsue/src/phy/phch_worker.cc
View File

@ -27,6 +27,7 @@
#include <unistd.h>
#include <string.h>
#include "phy/phch_worker.h"
#include "srslte/srslte.h"
#include "srslte/interfaces/ue_interfaces.h"
#include "srslte/asn1/liblte_rrc.h"
@ -40,8 +41,6 @@
#ifdef ENABLE_GUI
#include "srsgui/srsgui.h"
#include <semaphore.h>
#include "srslte/srslte.h"
#include "srslte/interfaces/ue_interfaces.h"
void init_plots(srsue::phch_worker *worker);
pthread_t plot_thread;
@ -323,9 +322,9 @@ void phch_worker::work_imp()
ul_action.tti_offset = HARQ_DELAY_MS;
/* Send UL grant or HARQ information (from PHICH) to MAC */
if (ul_grant_available && ul_ack_available) {
if (ul_grant_available && ul_ack_available && ul_mac_grant.phy_grant.ul.mcs.idx < 29) {
phy->mac->new_grant_ul_ack(ul_mac_grant, ul_ack, &ul_action);
} else if (ul_grant_available && !ul_ack_available) {
} else if (ul_grant_available && (!ul_ack_available || ul_mac_grant.phy_grant.ul.mcs.idx < 29)) {
phy->mac->new_grant_ul(ul_mac_grant, &ul_action);
} else if (!ul_grant_available && ul_ack_available) {
phy->mac->harq_recv(tti, ul_ack, &ul_action);
@ -480,11 +479,15 @@ bool phch_worker::decode_pdcch_dl(srsue::mac_interface_phy::mac_grant_t* grant)
grant->pid = ASYNC_DL_SCHED?dci_unpacked.harq_process:(tti%(2*HARQ_DELAY_MS));
// Set last TBS for this TB (pid) in case of mcs>29 (7.1.7.2 of 36.213)
// Set last TBS for this TB (pid) in case of mcs>28 (7.1.7.2 of 36.213)
for (int i=0;i<SRSLTE_MAX_CODEWORDS;i++) {
if (grant->phy_grant.dl.mcs[i].tbs < 0) {
if (grant->phy_grant.dl.mcs[i].idx > 28) {
grant->phy_grant.dl.mcs[i].tbs = last_dl_tbs[grant->pid%(2*HARQ_DELAY_MS)][i];
}
if(grant->phy_grant.dl.mcs[i].tbs < 0) {
Info("Invalid TBS size for PDSCH grant\n");
grant->phy_grant.dl.mcs[i].tbs = 0;
}
// save it
last_dl_tbs[grant->pid%(2*HARQ_DELAY_MS)][i] = grant->phy_grant.dl.mcs[i].tbs;
}
@ -743,16 +746,17 @@ bool phch_worker::decode_pdcch_ul(mac_interface_phy::mac_grant_t* grant)
if (ret) {
// Use last TBS for this TB in case of mcs>28
if (grant->phy_grant.ul.mcs.tbs < 0) {
grant->phy_grant.ul.mcs.tbs = last_ul_tbs[tti%(2*HARQ_DELAY_MS)];
if (grant->phy_grant.ul.mcs.idx > 28) {
grant->phy_grant.ul.mcs.tbs = last_ul_tbs[TTI_RX(tti)%(2*HARQ_DELAY_MS)];
Info("RETX: mcs=%d, old_tbs=%d pid=%d\n", grant->phy_grant.ul.mcs.idx, grant->phy_grant.ul.mcs.tbs, TTI_TX(tti)%(2*HARQ_DELAY_MS));
}
last_ul_tbs[tti%(2*HARQ_DELAY_MS)] = grant->phy_grant.ul.mcs.tbs;
last_ul_tbs[TTI_RX(tti)%(2*HARQ_DELAY_MS)] = grant->phy_grant.ul.mcs.tbs;
if (grant->phy_grant.ul.mcs.mod == SRSLTE_MOD_LAST) {
grant->phy_grant.ul.mcs.mod = last_ul_mod[tti%(2*HARQ_DELAY_MS)];
grant->phy_grant.ul.mcs.mod = last_ul_mod[TTI_RX(tti)%(2*HARQ_DELAY_MS)];
grant->phy_grant.ul.Qm = srslte_mod_bits_x_symbol(grant->phy_grant.ul.mcs.mod);
}
last_ul_mod[tti%(2*HARQ_DELAY_MS)] = grant->phy_grant.ul.mcs.mod;
last_ul_mod[TTI_RX(tti)%(2*HARQ_DELAY_MS)] = grant->phy_grant.ul.mcs.mod;
}
/* Limit UL modulation if not supported by the UE or disabled by higher layers */