pdcp_fifo.c 20.6 KB
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/*******************************************************************************

  Eurecom OpenAirInterface
  Copyright(c) 1999 - 2011 Eurecom

  This program is free software; you can redistribute it and/or modify it
  under the terms and conditions of the GNU General Public License,
  version 2, as published by the Free Software Foundation.

  This program is distributed in the hope it will be useful, but WITHOUT
  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  more details.

  You should have received a copy of the GNU General Public License along with
  this program; if not, write to the Free Software Foundation, Inc.,
  51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.

  The full GNU General Public License is included in this distribution in
  the file called "COPYING".

  Contact Information
  Openair Admin: openair_admin@eurecom.fr
  Openair Tech : openair_tech@eurecom.fr
  Forums       : http://forums.eurecom.fsr/openairinterface
  Address      : Eurecom, 2229, route des crêtes, 06560 Valbonne Sophia Antipolis, France

*******************************************************************************/

/*! \file pdcp_fifo.c
* \brief pdcp interface with linux IP interface
* \author  Lionel GAUTHIER and Navid Nikaein
* \date 2009
* \version 0.5
* \warning This component can be runned only in user-space
* @ingroup pdcp
*/

#define PDCP_FIFO_C
#define PDCP_DEBUG 1
//#define IDROMEL_NEMO 1

#ifndef OAI_EMU
extern int otg_enabled;
#endif

#include "pdcp.h"
#include "pdcp_primitives.h"

#ifdef USER_MODE
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#define rtf_put write
#define rtf_get read
#else
#include <rtai_fifos.h>
#endif //USER_MODE

#include "../MAC/extern.h"
#include "RRC/L2_INTERFACE/openair_rrc_L2_interface.h"
#include "SIMULATION/ETH_TRANSPORT/extern.h"
#include "UTIL/OCG/OCG.h"
#include "UTIL/OCG/OCG_extern.h"
#include "UTIL/LOG/log.h"
#include "UTIL/FIFO/pad_list.h"

#ifdef NAS_NETLINK
#include <sys/socket.h>
#include <linux/netlink.h>

extern struct sockaddr_nl nas_src_addr, nas_dest_addr;
extern struct nlmsghdr *nas_nlh;
extern struct iovec nas_iov;
extern int nas_sock_fd;
extern struct msghdr nas_msg;

#define MAX_PAYLOAD 1600

unsigned char pdcp_read_state = 0;
unsigned char pdcp_read_payload[MAX_PAYLOAD];
#endif

extern Packet_OTG_List *otg_pdcp_buffer;

pdcp_data_req_header_t pdcp_read_header;

//-----------------------------------------------------------------------------
int
    pdcp_fifo_flush_sdus (u32_t frame,u8 eNB_flag)
{
  //-----------------------------------------------------------------------------

  mem_block_t     *sdu = list_get_head (&pdcp_sdu_list);
  int             bytes_wrote = 0;
  int             pdcp_nb_sdu_sent = 0;
  u8              cont = 1;
  int ret;
  int mcs_inst;
  
  while (sdu && cont) {

#if defined(OAI_EMU)
    mcs_inst = ((pdcp_data_ind_header_t *)(sdu->data))->inst; 
    // asjust the instance id when passing sdu to IP
    ((pdcp_data_ind_header_t *)(sdu->data))->inst = (((pdcp_data_ind_header_t *)(sdu->data))->inst >= NB_eNB_INST) ?
                                                    ((pdcp_data_ind_header_t *)(sdu->data))->inst - NB_eNB_INST +oai_emulation.info.nb_enb_local - oai_emulation.info.first_ue_local :// UE
                                                    ((pdcp_data_ind_header_t *)(sdu->data))->inst - oai_emulation.info.first_ue_local; // ENB
#else
    ((pdcp_data_ind_header_t *)(sdu->data))->inst = 0;
#endif

#ifdef PDCP_DEBUG
    LOG_I(PDCP, "PDCP->IP TTI %d INST %d: Preparing %d Bytes of data from rab %d to Nas_mesh\n",
          frame, ((pdcp_data_ind_header_t *)(sdu->data))->inst,
          ((pdcp_data_ind_header_t *)(sdu->data))->data_size, ((pdcp_data_ind_header_t *)(sdu->data))->rb_id);
#endif //PDCP_DEBUG

    cont = 0;

    if (!pdcp_output_sdu_bytes_to_write) {
      if (!pdcp_output_header_bytes_to_write) {
        pdcp_output_header_bytes_to_write = sizeof (pdcp_data_ind_header_t);
      }

#ifdef NAS_FIFO
      bytes_wrote = rtf_put (PDCP2NAS_FIFO,
                             &(((u8 *) sdu->data)[sizeof (pdcp_data_ind_header_t) - pdcp_output_header_bytes_to_write]),
                             pdcp_output_header_bytes_to_write);

#else
#ifdef NAS_NETLINK
#ifdef LINUX
      memcpy(NLMSG_DATA(nas_nlh), &(((u8 *) sdu->data)[sizeof (pdcp_data_ind_header_t) - pdcp_output_header_bytes_to_write]),
             pdcp_output_header_bytes_to_write);
      nas_nlh->nlmsg_len = pdcp_output_header_bytes_to_write;
#endif //LINUX
#endif //NAS_NETLINK

      bytes_wrote = pdcp_output_header_bytes_to_write;
#endif //NAS_FIFO

#ifdef PDCP_DEBUG
      LOG_I(PDCP, "Frame %d Sent %d Bytes of header to Nas_mesh\n",
            frame,
            bytes_wrote);
#endif //PDCP_DEBUG

      if (bytes_wrote > 0) {
        pdcp_output_header_bytes_to_write = pdcp_output_header_bytes_to_write - bytes_wrote;

        if (!pdcp_output_header_bytes_to_write) { // continue with sdu
          pdcp_output_sdu_bytes_to_write = ((pdcp_data_ind_header_t *) sdu->data)->data_size;

#ifdef NAS_FIFO
          bytes_wrote = rtf_put (PDCP2NAS_FIFO, &(sdu->data[sizeof (pdcp_data_ind_header_t)]), pdcp_output_sdu_bytes_to_write);
#else

#ifdef NAS_NETLINK
#ifdef LINUX
          memcpy(NLMSG_DATA(nas_nlh)+sizeof(pdcp_data_ind_header_t), &(sdu->data[sizeof (pdcp_data_ind_header_t)]), pdcp_output_sdu_bytes_to_write);
          nas_nlh->nlmsg_len += pdcp_output_sdu_bytes_to_write;
          ret = sendmsg(nas_sock_fd,&nas_msg,0);
          if (ret<0) {
            LOG_D(PDCP, "[PDCP_FIFOS] sendmsg returns %d (errno: %d)\n", ret, errno);
            mac_xface->macphy_exit("");
            break;
          }
#endif // LINUX
#endif //NAS_NETLINK
          bytes_wrote= pdcp_output_sdu_bytes_to_write;
#endif // NAS_FIFO

#ifdef PDCP_DEBUG
          LOG_I(PDCP, "PDCP->IP Frame %d INST %d: Sent %d Bytes of data from rab %d to Nas_mesh\n",
                frame,
                ((pdcp_data_ind_header_t *)(sdu->data))->inst,
                bytes_wrote,
                ((pdcp_data_ind_header_t *)(sdu->data))->rb_id);
#endif //PDCP_DEBUG
          if (bytes_wrote > 0) {
            pdcp_output_sdu_bytes_to_write -= bytes_wrote;

            if (!pdcp_output_sdu_bytes_to_write) { // OK finish with this SDU
              // LOG_D(PDCP, "rb sent a sdu qos_sap %d\n", sapiP);
              LOG_D(PDCP,
                    "[MSC_MSG][FRAME %05d][PDCP][MOD %02d][RB %02d][--- PDCP_DATA_IND / %d Bytes --->][IP][MOD %02d][]\n",
                    frame,
                    mcs_inst, //((pdcp_data_ind_header_t *)(sdu->data))->inst,
                    ((pdcp_data_ind_header_t *)(sdu->data))->rb_id,
                    ((pdcp_data_ind_header_t *)(sdu->data))->data_size,
                    mcs_inst); //((pdcp_data_ind_header_t *)(sdu->data))->inst

              list_remove_head (&pdcp_sdu_list);
              free_mem_block (sdu);
              cont = 1;
              pdcp_nb_sdu_sent += 1;
              sdu = list_get_head (&pdcp_sdu_list);
            }
          } else {
            LOG_W(PDCP, "RADIO->IP SEND SDU CONGESTION!\n");
          }
        } else {
          LOG_W(PDCP, "RADIO->IP SEND SDU CONGESTION!\n");
        }
      }
    } else {
      // continue writing sdu
#ifdef NAS_FIFO
      bytes_wrote = rtf_put (PDCP2NAS_FIFO,
                             (u8 *) (&(sdu->data[sizeof (pdcp_data_ind_header_t) + ((pdcp_data_ind_header_t *) sdu->data)->data_size - pdcp_output_sdu_bytes_to_write])),
                             pdcp_output_sdu_bytes_to_write);
#else  // NAS_FIFO
      bytes_wrote = pdcp_output_sdu_bytes_to_write;
#endif  // NAS_FIFO

      if (bytes_wrote > 0) {
        pdcp_output_sdu_bytes_to_write -= bytes_wrote;

        if (!pdcp_output_sdu_bytes_to_write) {     // OK finish with this SDU
          //PRINT_RB_SEND_OUTPUT_SDU ("[PDCP] RADIO->IP SEND SDU\n");
          list_remove_head (&pdcp_sdu_list);
          free_mem_block (sdu);
          cont = 1;
          pdcp_nb_sdu_sent += 1;
          sdu = list_get_head (&pdcp_sdu_list);
          // LOG_D(PDCP, "rb sent a sdu from rab\n");
        }
      }
    }
  }
#ifdef NAS_FIFO
  if ((pdcp_nb_sdu_sent)) {
    if ((pdcp_2_nas_irq > 0)) {
#ifdef PDCP_DEBUG
      LOG_I(PDCP, "Frame %d : Trigger NAS RX interrupt\n",
            frame);
#endif //PDCP_DEBUG

      rt_pend_linux_srq (pdcp_2_nas_irq);
    } else {
      LOG_E(PDCP, "Frame %d: ERROR IF IP STACK WANTED : NOTIF PACKET(S) pdcp_2_nas_irq not initialized : %d\n",
            frame,
            pdcp_2_nas_irq);
    }
  }
#endif  //NAS_FIFO

  return pdcp_nb_sdu_sent;
}

//-----------------------------------------------------------------------------
/*
 * returns a positive value if whole bytes that had to be read were read
 * returns zero  value if whole bytes that had to be read were not read at all
 * returns a negative  value if an error was encountered while reading the rt fifo
 */
int
    pdcp_fifo_read_input_sdus_remaining_bytes (u32_t frame,u8_t eNB_flag)
{
  //-----------------------------------------------------------------------------
  sdu_size_t             bytes_read=0;

  // if remaining bytes to read
  if (pdcp_input_sdu_remaining_size_to_read > 0) {
    bytes_read = rtf_get (NAS2PDCP_FIFO,
                          &(pdcp_input_sdu_buffer[pdcp_input_sdu_size_read]),
                          pdcp_input_sdu_remaining_size_to_read);

    if (bytes_read > 0) {
      LOG_D(PDCP, "[PDCP_FIFOS] Read %d remaining bytes of data from Nas_mesh\n", bytes_read);

      pdcp_input_sdu_remaining_size_to_read = pdcp_input_sdu_remaining_size_to_read - bytes_read;
      pdcp_input_sdu_size_read = pdcp_input_sdu_size_read + bytes_read;

      if (pdcp_input_sdu_remaining_size_to_read != 0) {
        return 0;
      } else {
#ifdef PDCP_DEBUG
        LOG_I(PDCP, "Frame %d: IP->RADIO RECEIVED COMPLETE SDU size %d inst %d rb %d\n",
              frame,
              pdcp_input_sdu_size_read,
              pdcp_input_header.inst,
              pdcp_input_header.rb_id);
#endif //PDCP_DEBUG
        pdcp_input_sdu_size_read = 0;
#ifdef IDROMEL_NEMO
        pdcp_read_header.inst = 0;
#endif

        if (pdcp_array[pdcp_read_header.inst][pdcp_read_header.rb_id].instanciated_instance) {
          LOG_D(PDCP, "[MSC_MSG][FRAME %05d][IP][MOD %02d][][--- PDCP_DATA_REQ / %d Bytes --->][PDCP][MOD %02d][RB %02d]\n",
                frame, pdcp_read_header.inst,  pdcp_read_header.data_size, pdcp_read_header.inst, pdcp_read_header.rb_id);

          pdcp_data_req (pdcp_input_header.inst,
                         frame, eNB_flag,
                         pdcp_input_header.rb_id,
                         RLC_MUI_UNDEFINED,
                         RLC_SDU_CONFIRM_NO,
                         pdcp_input_header.data_size,
                         pdcp_input_sdu_buffer,
                         PDCP_DATA_PDU);
        }
        // not necessary
        //memset(pdcp_input_sdu_buffer, 0, MAX_IP_PACKET_SIZE);
        return 1;
      }
    } else {
      return bytes_read;
    }
  }
  return 1;
}

//-----------------------------------------------------------------------------
int
    pdcp_fifo_read_input_sdus (u32_t frame, u8_t eNB_flag)
{
  //-----------------------------------------------------------------------------
#ifdef NAS_FIFO
  int             cont;
  int             bytes_read;

  // if remaining bytes to read
  if (pdcp_fifo_read_input_sdus_remaining_bytes (frame,eNB_flag) > 0) {

    // all bytes that had to be read for a SDU were read
    // if not overflow of list, try to get new sdus from rt fifo
    cont = 1;

    while (cont > 0) {
      bytes_read = rtf_get (NAS2PDCP_FIFO,
                            &(((u8 *) & pdcp_input_header)[pdcp_input_index_header]),
                            sizeof (pdcp_data_req_header_t) - pdcp_input_index_header);

      if (bytes_read > 0) {
#ifdef PDCP_DEBUG
        LOG_D(PDCP, "[PDCP_FIFOS] TTI %d Read %d Bytes of data (header %d) from Nas_mesh\n",
              frame,
              bytes_read,
              sizeof(pdcp_data_req_header_t));
#endif // PDCP_DEBUG
        pdcp_input_index_header += bytes_read;

        if (pdcp_input_index_header == sizeof (pdcp_data_req_header_t)) {
#ifdef PDCP_DEBUG
          LOG_D(PDCP, "TTI %d IP->RADIO READ HEADER sdu size %d\n",
                frame,
                pdcp_input_header.data_size);
#endif //PDCP_DEBUG
          pdcp_input_index_header = 0;
          if (pdcp_input_header.data_size < 0) {
            LOG_E(PDCP, "READ_FIFO: DATA_SIZE %d < 0\n",pdcp_input_header.data_size);

            mac_xface->macphy_exit("");
            return 0;
          }
          pdcp_input_sdu_remaining_size_to_read = pdcp_input_header.data_size;
          pdcp_input_sdu_size_read     = 0;
          // we know the size of the sdu, so read the sdu;
          cont = pdcp_fifo_read_input_sdus_remaining_bytes (frame,eNB_flag);
        } else {
          cont = 0;
        }
        // error while reading rt fifo
      } else {
        cont = 0;
      }
    }
  }
  return bytes_read;

#else //NAS_FIFO
#ifdef NAS_NETLINK
  int len = 1;

  while (len > 0) {
    if (pdcp_read_state == 0) {
#ifdef LINUX
      len = recvmsg(nas_sock_fd, &nas_msg, 0);
#else
      len = -1;
#endif

      if (len < 0) {
        // nothing in pdcp NAS socket
        //LOG_I(PDCP, "[PDCP][NETLINK] Nothing in socket, length %d \n", len);
      } else {
#ifdef PDCP_DEBUG
#ifdef LINUX
        LOG_I(PDCP, "[PDCP][NETLINK] Received socket with length %d (nlmsg_len = %d)\n", \
              len, nas_nlh->nlmsg_len-sizeof(struct nlmsghdr));
#else
        LOG_I(PDCP, "[PDCP][NETLINK] nlmsg_len = %d (%d,%d)\n", \
              nas_nlh->nlmsg_len, sizeof(pdcp_data_req_header_t), \
              sizeof(struct nlmsghdr));
#endif // LINUX
#endif // PDCP_DEBUG
      }

#ifdef LINUX
      if (nas_nlh->nlmsg_len == sizeof (pdcp_data_req_header_t) + sizeof(struct nlmsghdr)) {
        pdcp_read_state = 1;  //get
        memcpy((void *)&pdcp_read_header, (void *)NLMSG_DATA(nas_nlh), sizeof(pdcp_data_req_header_t));
      }
#else
      pdcp_read_state = 1;
#endif
    }

    if (pdcp_read_state == 1) {
#ifdef LINUX
      len = recvmsg(nas_sock_fd, &nas_msg, 0);
#else
      len = -1;
#endif

      if (len < 0) {
        // nothing in pdcp NAS socket
        //LOG_I(PDCP, "[PDCP][NETLINK] Nothing in socket, length %d \n", len);
      } else {
        pdcp_read_state = 0;
        // print_active_requests()

#ifdef LINUX
        memcpy(pdcp_read_payload, (unsigned char *)NLMSG_DATA(nas_nlh), nas_nlh->nlmsg_len - sizeof(struct nlmsghdr));
#endif

#ifdef OAI_EMU
        pdcp_read_header.inst = (pdcp_read_header.inst >= oai_emulation.info.nb_enb_local) ? \
                                pdcp_read_header.inst - oai_emulation.info.nb_enb_local+ NB_eNB_INST + oai_emulation.info.first_ue_local :
                                pdcp_read_header.inst +  oai_emulation.info.first_enb_local;
#else
        pdcp_read_header.inst = 0;
#endif

        if (pdcp_array[pdcp_read_header.inst][pdcp_read_header.rb_id].instanciated_instance) {
#ifdef PDCP_DEBUG
          LOG_I(PDCP, "[PDCP][NETLINK][IP->PDCP] TTI %d, INST %d: Received socket with length %d (nlmsg_len = %d) on Rab %d \n", \
                frame, pdcp_read_header.inst, len, nas_nlh->nlmsg_len-sizeof(struct nlmsghdr), pdcp_read_header.rb_id);
          LOG_D(PDCP, "[MSC_MSG][FRAME %05d][IP][MOD %02d][][--- PDCP_DATA_REQ / %d Bytes --->][PDCP][MOD %02d][RB %02d]\n",
                frame, pdcp_read_header.inst,  pdcp_read_header.data_size, pdcp_read_header.inst, pdcp_read_header.rb_id);
#endif

          pdcp_data_req(pdcp_read_header.inst,
                        frame,
                        eNB_flag,
                        pdcp_read_header.rb_id,
                        RLC_MUI_UNDEFINED,
                        RLC_SDU_CONFIRM_NO,
                        pdcp_read_header.data_size,
                        pdcp_read_payload,
                        PDCP_DATA_PDU);
        } else {
            LOG_E(PDCP, "Received packet for non-instanciated instance %u with rb_id %u\n",
                  pdcp_read_header.inst, pdcp_read_header.rb_id);
        }
      }
    }
  } // end of while

  return len;

#else // neither NAS_NETLINK nor NAS_FIFO
  return 0;
#endif // NAS_NETLINK
#endif // NAS_FIFO
}


void pdcp_fifo_read_input_sdus_from_otg (u32_t frame, u8_t eNB_flag, u8 UE_index, u8 eNB_index) {
  unsigned char *otg_pkt=NULL;
  int src_id, module_id; // src for otg
  int dst_id, rb_id; // dst for otg
  int pkt_size=0, pkt_cnt=0;
  u8 pdcp_mode;
  Packet_otg_elt * otg_pkt_info;
  // we need to add conditions to avoid transmitting data when the UE is not RRC connected.
#if defined(USER_MODE) && defined(OAI_EMU)
  if (oai_emulation.info.otg_enabled ==1 ){
    module_id = (eNB_flag == 1) ?  eNB_index : /*NB_eNB_INST +*/ UE_index ;
    //rb_id    = (eNB_flag == 1) ? eNB_index * MAX_NUM_RB + DTCH : (NB_eNB_INST + UE_index -1 ) * MAX_NUM_RB + DTCH ;

    if (eNB_flag == 1) { // search for DL traffic
      //for (dst_id = NB_eNB_INST; dst_id < NB_UE_INST + NB_eNB_INST; dst_id++) {
      while ((otg_pkt_info = pkt_list_remove_head(&(otg_pdcp_buffer[module_id]))) != NULL) {
        LOG_I(EMU,"HEAD of otg_pdcp_buffer[%d] is %p but Nb elts = %d\n", module_id, pkt_list_get_head(&(otg_pdcp_buffer[module_id])), otg_pdcp_buffer[module_id].nb_elements);
        //otg_pkt_info = pkt_list_remove_head(&(otg_pdcp_buffer[module_id]));
        dst_id = (otg_pkt_info->otg_pkt).dst_id;
        module_id = (otg_pkt_info->otg_pkt).module_id;
        rb_id = (otg_pkt_info->otg_pkt).rb_id;
        pdcp_mode = (otg_pkt_info->otg_pkt).mode;
        // generate traffic if the ue is rrc reconfigured state
	// if (mac_get_rrc_status(module_id, eNB_flag, dst_id ) > 2 /*RRC_CONNECTED*/) { // not needed: this test is already done in update_otg_enb
          otg_pkt = (u8*) (otg_pkt_info->otg_pkt).sdu_buffer;
          pkt_size = (otg_pkt_info->otg_pkt).sdu_buffer_size;
          if (otg_pkt != NULL) {
            //rb_id = (/*NB_eNB_INST +*/ dst_id -1 ) * MAX_NUM_RB + DTCH;
            LOG_D(OTG,"[eNB %d] Frame %d sending packet %d from module %d on rab id %d (src %d, dst %d) pkt size %d for pdcp mode %d\n", eNB_index, frame, pkt_cnt++, module_id, rb_id, module_id, dst_id, pkt_size, pdcp_mode);
            pdcp_data_req(module_id, frame, eNB_flag, rb_id, RLC_MUI_UNDEFINED, RLC_SDU_CONFIRM_NO, pkt_size, otg_pkt,pdcp_mode);
            free(otg_pkt);
          }
	  // } //else LOG_D(OTG,"frame %d enb %d-> ue %d link not yet established state %d  \n", frame, eNB_index,dst_id - NB_eNB_INST, mac_get_rrc_status(module_id, eNB_flag, dst_id - NB_eNB_INST));
      }
    } else while ((otg_pkt_info = pkt_list_remove_head(&(otg_pdcp_buffer[module_id]))) != NULL) {
      //otg_pkt_info = pkt_list_remove_head(&(otg_pdcp_buffer[module_id]));
      dst_id = (otg_pkt_info->otg_pkt).dst_id;
      module_id = (otg_pkt_info->otg_pkt).module_id;
      rb_id = (otg_pkt_info->otg_pkt).rb_id;
      src_id = module_id;

      if (mac_get_rrc_status(module_id, eNB_flag, eNB_index ) > 2 /*RRC_CONNECTED*/) {
        otg_pkt = (u8*) (otg_pkt_info->otg_pkt).sdu_buffer;
        pkt_size = (otg_pkt_info->otg_pkt).sdu_buffer_size;
        if (otg_pkt != NULL){
          //rb_id= eNB_index * MAX_NUM_RB + DTCH;
          LOG_D(OTG,"[UE %d] sending packet from module %d on rab id %d (src %d, dst %d) pkt size %d\n", UE_index, src_id, rb_id, src_id, dst_id, pkt_size);
          pdcp_data_req(src_id, frame, eNB_flag, rb_id, RLC_MUI_UNDEFINED, RLC_SDU_CONFIRM_NO,pkt_size, otg_pkt, PDCP_DATA_PDU);
          free(otg_pkt);
        }
      } //else LOG_D(OTG,"frame %d ue %d-> enb %d link not yet established state %d  \n", frame, UE_index, eNB_index, mac_get_rrc_status(module_id, eNB_flag, eNB_index ));
    }
  }
#else
  if ((otg_enabled==1) && (eNB_flag == 1)) { // generate DL traffic
    unsigned int ctime=0;
    src_id = eNB_index;
    ctime = frame * 100;

    /*if  ((mac_get_rrc_status(eNB_index, eNB_flag, 0 ) > 2) &&
  (mac_get_rrc_status(eNB_index, eNB_flag, 1 ) > 2)) { */
    for (dst_id = 0; dst_id<NUMBER_OF_UE_MAX; dst_id++) {
      if (mac_get_rrc_status(eNB_index, eNB_flag, dst_id ) > 2) {
        otg_pkt=packet_gen(src_id, dst_id, ctime, &pkt_size);
        if (otg_pkt != NULL){
          rb_id = dst_id * NB_RB_MAX + DTCH;
          pdcp_data_req(src_id, frame, eNB_flag, rb_id, RLC_MUI_UNDEFINED, RLC_SDU_CONFIRM_NO,pkt_size, otg_pkt, PDCP_DATA_PDU);
          LOG_I(OTG,"send packet from module %d on rab id %d (src %d, dst %d) pkt size %d\n", eNB_index, rb_id, src_id, dst_id, pkt_size);
          free(otg_pkt);
        }
        /*else {
            LOG_I(OTG,"nothing generated (src %d, dst %d)\n",src_id, dst_id);
            }*/
      }
      /*else {
          LOG_I(OTG,"rrc_status (src %d, dst %d) = %d\n",src_id, dst_id, mac_get_rrc_status(src_id, eNB_flag, dst_id ));
          }*/
    }
  }
#endif
}