diff --git a/openair2/LAYER2/MAC/eNB_scheduler_RA.c b/openair2/LAYER2/MAC/eNB_scheduler_RA.c
index 64e8c8380f69c52e403a340ab9a0114fcde48d99..88ee3d14aec5536efae1fdc638a817f6ca068d60 100644
--- a/openair2/LAYER2/MAC/eNB_scheduler_RA.c
+++ b/openair2/LAYER2/MAC/eNB_scheduler_RA.c
@@ -209,7 +209,7 @@ void generate_Msg2(module_id_t module_idP,int CC_idP,frame_t frameP,sub_frame_t
// get narrowband according to higher-layer config
num_nb = p[RA_template->rach_resource_type-1]->mpdcch_NarrowbandsToMonitor_r13.list.count;
RA_template->msg2_narrowband = *p[RA_template->rach_resource_type-1]->mpdcch_NarrowbandsToMonitor_r13.list.array[RA_template->preamble_index%num_nb];
- first_rb = RA_template->msg2_narrowband*6;
+ first_rb = narrowband_to_first_rb(&cc[CC_idP],RA_template->msg2_narrowband);
if ((RA_template->msg2_mpdcch_repetition_cnt == 0) &&
(mpdcch_sf_condition(eNB,CC_idP,frameP,subframeP,rmax,TYPE2)>0)){
@@ -555,8 +555,8 @@ void generate_Msg4(module_id_t module_idP,int CC_idP,frame_t frameP,sub_frame_t
// get actual repetition count from Table 9.1.5-3
reps = (rmax<=8)?(1<<rep):(rmax>>(3-rep));
// get first narrowband
- first_rb = RA_template->msg34_narrowband*6;
-
+ first_rb = narrowband_to_first_rb(&cc[CC_idP],RA_template->msg34_narrowband);
+
if ((RA_template->msg4_mpdcch_repetition_cnt == 0) &&
(mpdcch_sf_condition(eNB,CC_idP,frameP,subframeP,rmax,TYPE2)>0)){
// MPDCCH configuration for RAR
diff --git a/openair2/LAYER2/MAC/eNB_scheduler_bch.c b/openair2/LAYER2/MAC/eNB_scheduler_bch.c
index 426693dd9fcb8c61a2b97fe2937841fc8181fd72..a5056f165cefe762aad295d00cbfb5c6aed24035 100644
--- a/openair2/LAYER2/MAC/eNB_scheduler_bch.c
+++ b/openair2/LAYER2/MAC/eNB_scheduler_bch.c
@@ -199,7 +199,9 @@ schedule_SIB1_BR(
LOG_D(MAC,"[eNB %d] Frame %d : BCCH_BR->DLSCH CC_id %d, Received %d bytes \n",module_idP,frameP,CC_id,bcch_sdu_length);
// allocate all 6 PRBs in narrowband for SIB1_BR
- first_rb = n_NB*6;
+
+ first_rb = narrowband_to_first_rb(cc,n_NB);
+
vrb_map[first_rb] = 1;
vrb_map[first_rb+1] = 1;
vrb_map[first_rb+2] = 1;
@@ -383,7 +385,7 @@ schedule_SI_BR(
LOG_D(MAC,"[eNB %d] Frame %d : BCCH_BR %d->DLSCH CC_id %d, Received %d bytes \n",module_idP,frameP,i,CC_id,bcch_sdu_length);
// allocate all 6 PRBs in narrowband for SIB1_BR
- first_rb = si_Narrowband_r13*6;
+ first_rb = narrowband_to_first_rb(cc,si_Narrowband_r13);
vrb_map[first_rb] = 1;
vrb_map[first_rb+1] = 1;
vrb_map[first_rb+2] = 1;
diff --git a/openair2/LAYER2/MAC/eNB_scheduler_primitives.c b/openair2/LAYER2/MAC/eNB_scheduler_primitives.c
index 09e5fe4d2cd3f26c54d453c88b5b465ea29a5e09..02e0db1c4e3d5e249aa8d930d2a72a45d9b28bb1 100644
--- a/openair2/LAYER2/MAC/eNB_scheduler_primitives.c
+++ b/openair2/LAYER2/MAC/eNB_scheduler_primitives.c
@@ -524,7 +524,35 @@ int mpdcch_sf_condition(eNB_MAC_INST *eNB,int CC_id, frame_t frameP,sub_frame_t
}
+int narrowband_to_first_rb(COMMON_channels_t *cc, int nb_index) {
+ switch (cc->mib->message.dl_Bandwidth) {
+ case 0: // 6 PRBs, N_NB=1, i_0=0
+ return(0);
+ break;
+ case 3: // 50 PRBs, N_NB=8, i_0=1
+ return((int)(1+(6*nb_index)));
+ break;
+ case 5: // 100 PRBs, N_NB=16, i_0=2
+ return((int)(2+(6*nb_index)));
+ break;
+ case 1: // 15 PRBs N_NB=2, i_0=1
+ if (nb_index>0) return(1);
+ else return(0);
+ break;
+ case 2: // 25 PRBs, N_NB=4, i_0=0
+ if (nb_index>1) return(1+(6*nb_index));
+ else return((6*nb_index));
+ break;
+ case 4: // 75 PRBs, N_NB=12, i_0=1
+ if (nb_index>5) return(2+(6*nb_index));
+ else return(1+(6*nb_index));
+ break;
+ default:
+ AssertFatal(1==0,"Impossible dl_Bandwidth %d\n",cc->mib->message.dl_Bandwidth);
+ break;
+ }
+}
#endif
//------------------------------------------------------------------------------
diff --git a/openair2/LAYER2/MAC/proto.h b/openair2/LAYER2/MAC/proto.h
index 54bb2f8ad9507c8f195fed77c836f77279503972..8781a4112804554289385ea257890f77a12adb80 100644
--- a/openair2/LAYER2/MAC/proto.h
+++ b/openair2/LAYER2/MAC/proto.h
@@ -904,6 +904,9 @@ int get_numnarrowbandbits(long dl_Bandwidth);
int mpdcch_sf_condition(eNB_MAC_INST *eNB,int CC_id, frame_t frameP,sub_frame_t subframeP,int rmax,MPDCCH_TYPES_t mpdcch_type);
int get_numnarrowbands(long dl_Bandwidth);
+
+int narrowband_to_first_rb(COMMON_channels_t *cc, int nb_index);
+
#endif