diff --git a/radio/fhi_72/oaioran.c b/radio/fhi_72/oaioran.c
index fc9f58a492..d6a31f3bc1 100644
--- a/radio/fhi_72/oaioran.c
+++ b/radio/fhi_72/oaioran.c
@@ -512,6 +512,14 @@ int xran_fh_tx_send_slot(ru_info_t *ru, int frame, int slot, uint64_t timestamp)
           for (idxElm = 0; idxElm < pRbMap->nPrbElm; idxElm++) {
             struct xran_section_desc *p_sec_desc = NULL;
             p_prbMapElm = &pRbMap->prbMap[idxElm];
+            if (sym_idx == 0) {
+              // ant_id / no of antenna per beam gives the beam_nb
+              p_prbMapElm->nBeamIndex = ru->beam_id[ant_id / (ru->nb_tx / ru->num_beams_period)][slot * XRAN_NUM_OF_SYMBOL_PER_SLOT];
+              // In phy-f-1.0/fhi_lib/lib/api/xran_pkt_cp.h, beamId:15 is of 15bit. -1 set extension bit ef:1 to 1 mistakenly.
+              if (p_prbMapElm->nBeamIndex == -1)
+                p_prbMapElm->nBeamIndex = 0;
+            }
+
             // assumes one fragment per symbol
 #ifdef E_RELEASE
             p_sec_desc = p_prbMapElm->p_sec_desc[sym_id][0];
diff --git a/radio/fhi_72/oran_isolate.c b/radio/fhi_72/oran_isolate.c
index 3bdbe1df12..48e95e7344 100644
--- a/radio/fhi_72/oran_isolate.c
+++ b/radio/fhi_72/oran_isolate.c
@@ -214,7 +214,10 @@ void oran_fh_if4p5_south_in(RU_t *ru, int *frame, int *slot)
 {
   ru_info_t ru_info;
   ru_info.nb_rx = ru->nb_rx * ru->num_beams_period;
+  ru_info.nb_tx = ru->nb_tx * ru->num_beams_period;
   ru_info.rxdataF = ru->common.rxdataF;
+  ru_info.beam_id = ru->common.beam_id;
+  ru_info.num_beams_period = ru->num_beams_period;
   ru_info.prach_buf = ru->prach_rxsigF[0]; // index: [prach_oca][ant_id]
 
   RU_proc_t *proc = &ru->proc;
@@ -267,8 +270,12 @@ void oran_fh_if4p5_south_out(RU_t *ru, int frame, int slot, uint64_t timestamp)
 {
   start_meas(&ru->tx_fhaul);
   ru_info_t ru_info;
+  ru_info.nb_rx = ru->nb_rx * ru->num_beams_period;
   ru_info.nb_tx = ru->nb_tx * ru->num_beams_period;
   ru_info.txdataF_BF = ru->common.txdataF_BF;
+  ru_info.beam_id = ru->common.beam_id;
+  ru_info.num_beams_period = ru->num_beams_period;
+
   // printf("south_out:\tframe=%d\tslot=%d\ttimestamp=%ld\n",frame,slot,timestamp);
 
   int ret = xran_fh_tx_send_slot(&ru_info, frame, slot, timestamp);
diff --git a/radio/fhi_72/oran_isolate.h b/radio/fhi_72/oran_isolate.h
index 174c1399a6..7dd61ad739 100644
--- a/radio/fhi_72/oran_isolate.h
+++ b/radio/fhi_72/oran_isolate.h
@@ -41,6 +41,14 @@ typedef struct ru_info_s {
   int nb_tx;
   int32_t **txdataF_BF;
 
+  /// \brief Anaglogue beam ID for each OFDM symbol (used when beamforming not done in RU)
+  /// - first index: concurrent beam
+  /// - second index: beam_id [0.. symbols_per_frame]
+  int32_t **beam_id;
+
+  /// number of concurrent analog beams in period
+  int num_beams_period;
+
   // Needed for Prach
   int16_t **prach_buf;
 } ru_info_t;