diff --git a/srsapps/radio/include/srsapps/radio/radio_uhd.h b/srsapps/radio/include/srsapps/radio/radio_uhd.h
index 1b560220f..acc21e8df 100644
--- a/srsapps/radio/include/srsapps/radio/radio_uhd.h
+++ b/srsapps/radio/include/srsapps/radio/radio_uhd.h
@@ -81,7 +81,7 @@ namespace srslte {
       void *uhd; 
       
       static const double lo_offset = 8e6; // LO offset (in Hz)      
-      static const double burst_settle_time = 0.3e-3; // Start of burst settle time (off->on RF transition time)      
+      static const double burst_settle_time = 0.4e-3; // Start of burst settle time (off->on RF transition time)      
       const static uint32_t burst_settle_max_samples = 12288;  // 30.72 MHz is maximum frequency
 
       srslte_timestamp_t end_of_burst_time; 
diff --git a/srsapps/ue/mac/include/srsapps/ue/mac/mac.h b/srsapps/ue/mac/include/srsapps/ue/mac/mac.h
index b87d76c1f..e6b3c8f83 100644
--- a/srsapps/ue/mac/include/srsapps/ue/mac/mac.h
+++ b/srsapps/ue/mac/include/srsapps/ue/mac/mac.h
@@ -159,6 +159,7 @@ private:
   trace<uint32_t> tr_start_time;
   trace<uint32_t> tr_end_time;
   bool tr_enabled;   
+  bool is_first_of_burst;
   void tr_log_start(uint32_t tti);
   void tr_log_end(uint32_t tti);    
   void set_phy_crnti(uint16_t phy_rnti);
diff --git a/srsapps/ue/mac/include/srsapps/ue/mac/proc_bsr.h b/srsapps/ue/mac/include/srsapps/ue/mac/proc_bsr.h
index 955901c67..9b39b84f5 100644
--- a/srsapps/ue/mac/include/srsapps/ue/mac/proc_bsr.h
+++ b/srsapps/ue/mac/include/srsapps/ue/mac/proc_bsr.h
@@ -89,6 +89,7 @@ private:
   bool timer_retx;
   
   bool sr_is_sent;
+  uint32_t last_print;
   void update_pending_data(); 
   bool check_highest_channel(); 
   bool check_single_channel(); 
diff --git a/srsapps/ue/mac/src/mac.cc b/srsapps/ue/mac/src/mac.cc
index 1078cf841..c5bef4cca 100644
--- a/srsapps/ue/mac/src/mac.cc
+++ b/srsapps/ue/mac/src/mac.cc
@@ -56,6 +56,7 @@ bool mac::init(phy *phy_h_, tti_sync* ttisync_, log* log_h_)
   demux_unit.init(phy_h, log_h, &mac_io_lch, &timers_db);
   ra_procedure.init(&params_db, phy_h, log_h, &timers_db, &mux_unit, &demux_unit);
   sr_procedure.init(log_h, &params_db, phy_h);
+  is_first_of_burst = true; 
   reset();
 
   if (threads_new_rt_prio(&mac_thread, mac_thread_fnc, this, 5)) {
@@ -251,6 +252,28 @@ void mac::main_radio_loop() {
       if (ra_procedure.is_contention_resolution() || ra_procedure.is_successful()) {
         process_ul_grants(tti);
       }
+      ul_buffer *ul_buffer = phy_h->get_ul_buffer(tti+4);
+      
+      // Generate scheduling request if we have to 
+      if (phy_h->sr_is_ready_to_send(tti+4)) {
+        ul_buffer->generate_sr();
+      }
+      
+      // The UL buffer is released when successfully transmitted. 
+      if (ul_buffer->is_released()) {
+        ul_buffer->ready();
+        is_first_of_burst = false; 
+      } else if (ul_buffer->uci_ready() || ul_buffer->srs_is_ready_to_send()) { 
+        // If the packet was not generated by a call from MAC, means it's PUCCH or SRS. Generate now the signal
+        ul_buffer->generate_data();
+        ul_buffer->ready();
+        is_first_of_burst = false; 
+      } else {
+        if (!is_first_of_burst) {
+          ul_buffer->set_end_of_burst();
+          is_first_of_burst = true; 
+        }
+      }
       
       timers_db.step_all();
       
diff --git a/srsapps/ue/mac/src/proc_bsr.cc b/srsapps/ue/mac/src/proc_bsr.cc
index 5b6d0aeed..d0cc37437 100644
--- a/srsapps/ue/mac/src/proc_bsr.cc
+++ b/srsapps/ue/mac/src/proc_bsr.cc
@@ -44,6 +44,7 @@ bsr_proc::bsr_proc()
     priorities[i] = -1; 
     last_pending_data[i] = 0; 
   }        
+  last_print = 0; 
   triggered_bsr_type=NONE; 
 }
 
@@ -67,14 +68,14 @@ void bsr_proc::timer_expired(uint32_t timer_id) {
     case mac::BSR_TIMER_PERIODIC:
       if (triggered_bsr_type == NONE) {
         // Check condition 4 in Sec 5.4.5 
-        //triggered_bsr_type = PERIODIC; 
-        Info("BSR PERIODIC disabled\n");
+        triggered_bsr_type = PERIODIC; 
+        Info("Triggering BSR PERIODIC\n");
       }
       break;
     case mac::BSR_TIMER_RETX:
       // Enable reTx of SR 
-      //triggered_bsr_type = REGULAR; 
-      Info("BSR reTX disabled\n");
+      triggered_bsr_type = REGULAR; 
+      Info("Triggering BSR reTX\n");
       sr_is_sent = false; 
       break;      
   }
@@ -151,7 +152,7 @@ bool bsr_proc::generate_bsr(bsr_t *bsr, uint32_t nof_padding_bytes) {
   for (int i=0;i<mac_io_h->NOF_UL_LCH;i++) {
     if (lcg[i] >= 0) {
       uint32_t n = mac_io_h->get(i+mac_io::MAC_LCH_CCCH_UL)->pending_data()/8;
-      bsr->buff_size[lcg[i]] += n;
+      bsr->buff_size[lcg[i]] += 8*n;
       if (n > 0) {
         nof_lcg++;
         ret = true; 
@@ -216,6 +217,18 @@ void bsr_proc::step(uint32_t tti)
   check_highest_channel();
   
   update_pending_data();
+  
+  
+  if ((tti - last_print)%10240 > 40) {
+    char str[128];
+    bzero(str, 128);
+    for (int i=0;i<mac_io::NOF_UL_LCH;i++) {
+      sprintf(str, "%s%d (%d), ", str, mac_io_h->get(i+mac_io::MAC_LCH_CCCH_UL)->pending_data()/8, last_pending_data[i]);
+    }
+    Info("QUEUE status: %s\n", str);
+    last_print = tti; 
+  }
+  
 }
 
 char* bsr_proc::bsr_type_tostring(triggered_bsr_type_t type) {
diff --git a/srsapps/ue/mac/test/CMakeLists.txt b/srsapps/ue/mac/test/CMakeLists.txt
index 0bedf25be..fd0cec8b9 100644
--- a/srsapps/ue/mac/test/CMakeLists.txt
+++ b/srsapps/ue/mac/test/CMakeLists.txt
@@ -25,4 +25,7 @@ IF(UHD_FOUND AND OPENLTE_FOUND)
   INCLUDE_DIRECTORIES(${OPENLTE_INCLUDE_DIRS})
   ADD_EXECUTABLE(mac_test mac_test.cc)
   TARGET_LINK_LIBRARIES(mac_test srsapps_common srsapps_ue_mac srsapps_ue_phy srsapps_radio srslte ${OPENLTE_LIBRARIES} srslte_uhd)
-ENDIF(UHD_FOUND AND OPENLTE_FOUND)
+
+  ADD_EXECUTABLE(mac_test mac_test.cc)
+  TARGET_LINK_LIBRARIES(mac_test srsapps_common srsapps_ue_mac srsapps_ue_phy srsapps_radio srslte ${OPENLTE_LIBRARIES} srslte_uhd)
+  ENDIF(UHD_FOUND AND OPENLTE_FOUND)
diff --git a/srsapps/ue/phy/include/srsapps/ue/phy/phy.h b/srsapps/ue/phy/include/srsapps/ue/phy/phy.h
index 638b0c997..b510f5072 100644
--- a/srsapps/ue/phy/include/srsapps/ue/phy/phy.h
+++ b/srsapps/ue/phy/include/srsapps/ue/phy/phy.h
@@ -125,12 +125,15 @@ public:
   void write_trace(std::string filename); 
   
   void main_radio_loop(); 
-  
+    bool         sr_is_ready_to_send(uint32_t tti);
+
 private:
   enum {
     IDLE, RXTX
   } phy_state; 
   
+  static const int NOF_ULDL_QUEUES = 6; 
+  
   tti_sync      *ttisync; 
   radio         *radio_handler;
   log           *log_h; 
@@ -158,7 +161,6 @@ private:
   double       last_gain;
   
   bool         sr_enabled;
-  bool         sr_is_ready_to_send(uint32_t tti);
   
   bool         init_(radio *radio_handler, tti_sync *ttisync, log *log_h, bool do_agc);
   static void *phy_thread_fnc(void *arg);
diff --git a/srsapps/ue/phy/include/srsapps/ue/phy/ul_buffer.h b/srsapps/ue/phy/include/srsapps/ue/phy/ul_buffer.h
index 9a765828d..b9115a659 100644
--- a/srsapps/ue/phy/include/srsapps/ue/phy/ul_buffer.h
+++ b/srsapps/ue/phy/include/srsapps/ue/phy/ul_buffer.h
@@ -33,6 +33,7 @@
 #include "srsapps/ue/phy/ul_sched_grant.h"
 #include "srsapps/ue/phy/dl_sched_grant.h"
 #include "srsapps/ue/phy/phy_params.h"
+#include "srsapps/radio/radio.h"
 
 #ifndef UEULBUFFER_H
 #define UEULBUFFER_H
@@ -47,7 +48,7 @@ namespace ue {
   class ul_buffer : public queue::element {
 
   public: 
-    bool     init_cell(srslte_cell_t cell, phy_params *params_db, log *log_h);
+    bool     init_cell(srslte_cell_t cell, phy_params *params_db, log *log_h, radio *radio_h);
     void     free_cell();
     void     set_crnti(uint16_t rnti);
     void     set_current_tx_nb(uint32_t current_tx_nb);
@@ -60,12 +61,18 @@ namespace ue {
     bool     generate_data();   
     bool     generate_data(ul_sched_grant *pusch_grant, uint8_t *payload);   
     bool     generate_data(ul_sched_grant *pusch_grant, srslte_softbuffer_tx_t *softbuffer, uint8_t *payload);   
-    bool     send(radio* radio_handler, float time_adv_sec, float cfo, srslte_timestamp_t rx_time);
-    static const uint32_t tx_advance_sf = 2; // Number of subframes to advance transmission
+    void     set_tx_params(float cfo, float time_adv_sec, srslte_timestamp_t tx_time);
+    void     set_end_of_burst();
+    bool     is_end_of_burst();
+    static const uint32_t tx_advance_sf = 1; // Number of subframes to advance transmission
     static const bool normalize_amp = true; 
   private: 
     log               *log_h; 
     phy_params        *params_db; 
+    radio             *radio_h; 
+    float              cfo;
+    bool               tti_is_end_of_burst; 
+    srslte_timestamp_t tx_time; 
     srslte_cell_t      cell; 
     srslte_ue_ul_t     ue_ul; 
     bool               cell_initiated; 
diff --git a/srsapps/ue/phy/src/phy.cc b/srsapps/ue/phy/src/phy.cc
index e32a7bf76..b38d45ffd 100644
--- a/srsapps/ue/phy/src/phy.cc
+++ b/srsapps/ue/phy/src/phy.cc
@@ -94,8 +94,8 @@ bool phy::init_(srslte::radio* radio_handler_, srslte::ue::tti_sync* ttisync_, l
   ttisync = ttisync_;
   log_h = log_h_; 
   radio_handler = radio_handler_;
-  ul_buffer_queue = new queue(6, sizeof(ul_buffer));
-  dl_buffer_queue = new queue(6, sizeof(dl_buffer));
+  ul_buffer_queue = new queue(NOF_ULDL_QUEUES, sizeof(ul_buffer));
+  dl_buffer_queue = new queue(NOF_ULDL_QUEUES, sizeof(dl_buffer));
   do_agc = do_agc_;
   last_gain = 1e4; 
   time_adv_sec = 0;
@@ -118,7 +118,7 @@ void phy::stop()
   
   pthread_join(phy_thread, NULL);
 
-  for (int i=0;i<6;i++) {
+  for (int i=0;i<NOF_ULDL_QUEUES;i++) {
     ((ul_buffer*) ul_buffer_queue->get(i))->free_cell();
     ((dl_buffer*) dl_buffer_queue->get(i))->free_cell();
   }
@@ -171,7 +171,7 @@ bool phy::send_prach(uint32_t preamble_idx, int allowed_subframe, int target_pow
   if (phy_state == RXTX) {
     srslte_agc_lock(&ue_sync.agc, true);
     old_gain = radio_handler->get_tx_gain();
-    radio_handler->set_tx_gain(10);
+    radio_handler->set_tx_gain(80);
     Info("Stopped AGC. Set TX gain to %.1f dB\n", radio_handler->get_tx_gain());
     return prach_buffer.prepare_to_send(preamble_idx, allowed_subframe, target_power_dbm);
   } 
@@ -224,7 +224,7 @@ bool phy::measure()
 }
 
 void phy::set_crnti(uint16_t rnti) {
-  for(uint32_t i=0;i<6;i++) {
+  for(uint32_t i=0;i<NOF_ULDL_QUEUES;i++) {
     ((ul_buffer*) ul_buffer_queue->get(i))->set_crnti(rnti);
     ((dl_buffer*) dl_buffer_queue->get(i))->set_crnti(rnti);      
     
@@ -319,8 +319,8 @@ bool phy::set_cell(srslte_cell_t cell_) {
         }
 
         srslte_ue_sync_set_cfo(&ue_sync, cellsearch_cfo);
-        for(uint32_t i=0;i<6;i++) {
-          ((ul_buffer*) ul_buffer_queue->get(i))->init_cell(cell, &params_db, log_h);
+        for(uint32_t i=0;i<NOF_ULDL_QUEUES;i++) {
+          ((ul_buffer*) ul_buffer_queue->get(i))->init_cell(cell, &params_db, log_h, radio_handler);
           ((dl_buffer*) dl_buffer_queue->get(i))->init_cell(cell, &params_db, log_h);      
           ((dl_buffer*) dl_buffer_queue->get(i))->buffer_id = i; 
           ((ul_buffer*) ul_buffer_queue->get(i))->ready(); 
@@ -345,7 +345,7 @@ bool phy::init_prach() {
 
 ul_buffer* phy::get_ul_buffer(uint32_t tti)
 {
-  if ((tti + 1)%10240 < get_current_tti() && tti > 6) {
+  if (tti + 1 < get_current_tti() && tti > NOF_ULDL_QUEUES) {
     Warning("Warning access to PHY UL buffer too late. Requested TTI=%d while PHY is in %d\n", tti, get_current_tti());
   }
   return (ul_buffer*) ul_buffer_queue->get(tti);        
@@ -519,15 +519,10 @@ void phy::run_rx_tx_state()
     log_h->step(current_tti);
     float cfo = srslte_ue_sync_get_cfo(&ue_sync)/15000; 
 
-    bool tx_zeros = true; 
-    
-    // Advance transmission time for the next tti 
     srslte_timestamp_add(&last_rx_time, 0, 1e-3);
 
-    // Generate scheduling request if we have to 
-    if (sr_is_ready_to_send(current_tti+ul_buffer::tx_advance_sf)) {
-      get_ul_buffer_adv(current_tti)->generate_sr();
-    }
+    /* Set CFO and next TX time for UL buffer for TTI+4 */    
+    get_ul_buffer(current_tti+4)->set_tx_params(cfo, time_adv_sec, last_rx_time);
     
     // Every subframe, TX a PRACH or a PUSCH/PUCCH
     if (prach_buffer.is_ready_to_send(current_tti)) {
@@ -536,25 +531,10 @@ void phy::run_rx_tx_state()
       radio_handler->tx_end();
       radio_handler->set_tx_gain(old_gain);
       srslte_agc_lock(&ue_sync.agc, false);
-      Info("Restoring AGC. Set TX gain to %.1f dB\n", old_gain);
-    
-    // If we don't transmit PRACH, check if need to transmit PUSCH/PUCCH
-    } else if (get_ul_buffer_adv(current_tti)->is_released() || 
-               get_ul_buffer_adv(current_tti)->uci_ready()   ||
-               get_ul_buffer_adv(current_tti)->srs_is_ready_to_send()) 
-    { 
-      // If the packet was not generated by a call from MAC, means it's PUCCH or SRS. Generate now the signal
-      if (!get_ul_buffer_adv(current_tti)->is_released()) {
-        get_ul_buffer_adv(current_tti)->generate_data();
-      }      
-      // And transmit
-      get_ul_buffer_adv(current_tti)->send(radio_handler, time_adv_sec, cfo, last_rx_time);
-      is_first_of_burst = false; 
-    } else {
-      if (!is_first_of_burst) {
-        radio_handler->tx_end();
-        is_first_of_burst = true; 
-      }
+      Info("Restoring AGC. Set TX gain to %.1f dB\n", old_gain);    
+    } else if (get_ul_buffer_adv(current_tti)->is_end_of_burst()) {
+      radio_handler->tx_end();
+      Info("Sending TX END\n");
     }
     
     // Receive alligned buffer for the current tti 
diff --git a/srsapps/ue/phy/src/ul_buffer.cc b/srsapps/ue/phy/src/ul_buffer.cc
index f5daf3e64..e8b4e6357 100644
--- a/srsapps/ue/phy/src/ul_buffer.cc
+++ b/srsapps/ue/phy/src/ul_buffer.cc
@@ -41,16 +41,18 @@
 namespace srslte {
 namespace ue {
 
-bool ul_buffer::init_cell(srslte_cell_t cell_, phy_params *params_db_, log *log_h_) {
+bool ul_buffer::init_cell(srslte_cell_t cell_, phy_params *params_db_, log *log_h_, radio *radio_h_) {
   cell = cell_; 
   log_h = log_h_; 
+  radio_h = radio_h_; 
   params_db = params_db_; 
   current_tx_nb = 0;
+  tti_is_end_of_burst = false; 
   if (!srslte_ue_ul_init(&ue_ul, cell)) {  
     srslte_ue_ul_set_normalization(&ue_ul, false); 
     signal_buffer = (cf_t*) srslte_vec_malloc(sizeof(cf_t) * SRSLTE_SF_LEN_PRB(cell.nof_prb));
     cell_initiated = (signal_buffer)?true:false;
-    srslte_ue_ul_set_cfo_enable(&ue_ul, false);
+    srslte_ue_ul_set_cfo_enable(&ue_ul, true);
     bzero(&uci_data, sizeof(srslte_uci_data_t));
     uci_pending = false; 
     return cell_initiated; 
@@ -209,6 +211,8 @@ bool ul_buffer::generate_data(ul_sched_grant *grant, srslte_softbuffer_tx_t *sof
     uci_data.I_offset_cqi    = params_db->get_param(phy_params::UCI_I_OFFSET_CQI);
     uci_data.I_offset_ri     = params_db->get_param(phy_params::UCI_I_OFFSET_RI);
 
+    srslte_ue_ul_set_cfo(&ue_ul, cfo);
+    
     int n = 0; 
     // Transmit on PUSCH if UL grant available, otherwise in PUCCH 
     if (grant) {
@@ -230,8 +234,8 @@ bool ul_buffer::generate_data(ul_sched_grant *grant, srslte_softbuffer_tx_t *sof
                                                     grant->get_rnti(), 
                                                     signal_buffer);    
 
-      Info("PUSCH: TTI=%d, TBS=%d, mod=%s, rb_start=%d n_prb=%d, ack=%s, sr=%s, rnti=%d, shortened=%s\n", 
-           tti, grant->get_tbs(), srslte_mod_string(ue_ul.pusch_cfg.grant.mcs.mod), ue_ul.pusch_cfg.grant.n_prb[0], 
+      Info("PUSCH: TTI=%d, CFO= %.1f KHz TBS=%d, mod=%s, rb_start=%d n_prb=%d, ack=%s, sr=%s, rnti=%d, shortened=%s\n", 
+           tti, cfo*15e3, grant->get_tbs(), srslte_mod_string(ue_ul.pusch_cfg.grant.mcs.mod), ue_ul.pusch_cfg.grant.n_prb[0], 
            ue_ul.pusch_cfg.grant.L_prb,  
            uci_data.uci_ack_len>0?(uci_data.uci_ack?"1":"0"):"no",uci_data.scheduling_request?"yes":"no", 
            grant->get_rnti(), ue_ul.pusch.shortened?"yes":"no");
@@ -240,18 +244,37 @@ bool ul_buffer::generate_data(ul_sched_grant *grant, srslte_softbuffer_tx_t *sof
     } else if (uci_data.scheduling_request || uci_data.uci_cqi_len > 0 || uci_data.uci_ack_len) {
       n = srslte_ue_ul_pucch_encode(&ue_ul, uci_data, tti%10, signal_buffer);
 
-      Info("PUCCH: TTI=%d n_cce=%d, ack=%s, sr=%s, shortened=%s\n", tti, last_n_cce, 
+      Info("PUCCH: TTI=%d, CFO= %.1f KHz n_cce=%d, ack=%s, sr=%s, shortened=%s\n", tti, cfo*15e3, last_n_cce, 
         uci_data.uci_ack_len>0?(uci_data.uci_ack?"1":"0"):"no",uci_data.scheduling_request?"yes":"no", 
         ue_ul.pucch.shortened?"yes":"no");        
     } else {
       n = srslte_ue_ul_srs_encode(&ue_ul, tti, signal_buffer);
       
-      Info("SRS only: TX at TTI=%d\n", tti);
+      Info("SRS: TTI=%d, CFO= %.1f KHz \n", tti, cfo*15e3);
     }
+    
     // Reset UCI data
     bzero(&uci_data, sizeof(srslte_uci_data_t));
     uci_pending = false; 
+      
+    // Compute peak
+    float max = 0; 
+    if (normalize_amp) {
+      float *t = (float*) signal_buffer;
+      for (int i=0;i<2*SRSLTE_SF_LEN_PRB(cell.nof_prb);i++) {
+        if (fabsf(t[i]) > max) {
+          max = fabsf(t[i]);
+        }
+      }
+      
+      // Normalize before TX 
+      srslte_vec_sc_prod_cfc(signal_buffer, 0.7/max, signal_buffer, SRSLTE_SF_LEN_PRB(cell.nof_prb));
+    }
+    
+    radio_h->tx(signal_buffer, SRSLTE_SF_LEN_PRB(cell.nof_prb), tx_time);         
+
     release();
+    
     if (n < 0) {
       fprintf(stderr, "Error in UL buffer: Error encoding %s\n", signal_buffer?"PUSCH":"PUCCH");
       return false; 
@@ -266,47 +289,23 @@ bool ul_buffer::generate_data(ul_sched_grant *grant, srslte_softbuffer_tx_t *sof
 
 int nof_tx = 0; 
 
-bool ul_buffer::send(srslte::radio* radio_handler, float time_adv_sec, float cfo, srslte_timestamp_t rx_time)
-{  
-  // send packet next timeslot minus time advance
-  srslte_timestamp_t tx_time; 
-  srslte_timestamp_copy(&tx_time, &rx_time);
-  srslte_timestamp_add(&tx_time, 0, tx_advance_sf*1e-3 - time_adv_sec); 
+void ul_buffer::set_tx_params(float cfo_, float time_adv_sec, srslte_timestamp_t tx_time_)
+{
+  tti_is_end_of_burst = false; 
+  cfo = cfo_; 
+  srslte_timestamp_copy(&tx_time, &tx_time_);
+  srslte_timestamp_add(&tx_time, 0, 4e-3 - time_adv_sec);
+}
 
-  // Correct CFO before transmission
-  if (cfo != 0) {
-    srslte_cfo_correct(&ue_ul.cfo, signal_buffer, signal_buffer, cfo / srslte_symbol_sz(cell.nof_prb));            
-  }
-  
-  // Compute peak
-  float max = 0; 
-  if (normalize_amp) {
-    float *t = (float*) signal_buffer;
-    for (int i=0;i<2*SRSLTE_SF_LEN_PRB(cell.nof_prb);i++) {
-      if (fabsf(t[i]) > max) {
-        max = fabsf(t[i]);
-      }
-    }
-    
-    // Normalize before TX 
-    srslte_vec_sc_prod_cfc(signal_buffer, 0.7/max, signal_buffer, SRSLTE_SF_LEN_PRB(cell.nof_prb));
-  }
-  
-  Info("TX CFO: %f, len=%d, rx_time= %.6f tx_time = %.6f TA: %.1f PeakAmplitude=%.2f PKT#%d\n", 
-        cfo*15000, SRSLTE_SF_LEN_PRB(cell.nof_prb),
-        srslte_timestamp_real(&rx_time), 
-        srslte_timestamp_real(&tx_time), time_adv_sec*1000000, max, nof_tx);
- 
-  radio_handler->tx(signal_buffer, SRSLTE_SF_LEN_PRB(cell.nof_prb), tx_time);                
-
-  /*
-  char filename[25];
-  sprintf(filename, "pusch%d",nof_tx);
-  srslte_vec_save_file(filename, signal_buffer, sizeof(cf_t)*SRSLTE_SF_LEN_PRB(cell.nof_prb));
-  nof_tx++;
-  */
-  
-  ready();
+void ul_buffer::set_end_of_burst()
+{
+  Info("Is end of burst\n");
+  tti_is_end_of_burst = true; 
+}
+
+bool ul_buffer::is_end_of_burst()
+{
+  return tti_is_end_of_burst; 
 }
   
 } // namespace ue
diff --git a/srslte/lib/cuhd/src/cuhd_imp.cpp b/srslte/lib/cuhd/src/cuhd_imp.cpp
index 553422b1b..f2048f8f1 100644
--- a/srslte/lib/cuhd/src/cuhd_imp.cpp
+++ b/srslte/lib/cuhd/src/cuhd_imp.cpp
@@ -162,7 +162,7 @@ int cuhd_open_(char *args, void **h, bool create_thread_gain, bool tx_gain_same_
 {
   cuhd_handler *handler = new cuhd_handler();
   std::string _args = std::string(args);
-  handler->usrp = uhd::usrp::multi_usrp::make(_args + ", master_clock_rate=30720000");
+  handler->usrp = uhd::usrp::multi_usrp::make(_args + ", master_clock_rate=30720000, num_recv_frames=512");
 
 //  handler->usrp = uhd::usrp::multi_usrp::make(_args + ", master_clock_rate=50000000" + ", num_recv_frames=512");
   handler->usrp->set_clock_source("internal");