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Commit 4f5cc15c authored by Michele Paffetti's avatar Michele Paffetti
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starting modify NB_mac_rrc_data_req primitive for SIBs scheduling purposes (L2_interface_nb_iot.c)

parent bb39e42c
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openair2/RRC/LITE/L2_interface_nb_iot.c
View file @ 4f5cc15c
......@@ -217,14 +217,18 @@ int NB_rrc_mac_config_req_eNB(
}
//defined in L2_interface
int npdsch_rep_to_array[3] ={4,8,16}; //TS 36.213 Table 16.4.1.3-3
int sib1_startFrame_to_array[4] = {0,16,32,48};//TS 36.213 Table 16.4.1.3-4
//function called by eNB_dlsch_ulsch_scheduler--> Schedule_SI (eNB_scheduler_bch) for getting the bcch_sdu_legnth (BCCH case for SIBs and MIB)
//Function called in schedule_RA for getting RRCConnectionSetup message (Msg4) length of rrc_sdu_length (CCCH case)
int8_t NB_mac_rrc_data_req_eNB(
const module_id_t Mod_idP,
const int CC_id,
const frame_t frameP,
const rb_id_t Srb_id,
uint8_t* const buffer_pP,
uint32_t start_sfn_sib1_NB, //starting frame for sib1 transmission
uint32_t nb_sib1_NB_rep, //number of sib1 repetitions
long schedulingInfoSIB1,//from the mib
int physCellId, //from the MAC instance-> common_channel
const frame_t h_frameP, //HSFN
long si_periodicity, //SI-periodicity
long si_windowLength //Si-windwolength
......@@ -232,7 +236,9 @@ int8_t NB_mac_rrc_data_req_eNB(
{
SRB_INFO *Srb_info;
uint8_t Sdu_size=0;
uint32_t y = 0;
uint32_t index = 0;
uint32_t sib1_startFrame;
uint8_t nb_rep=0; // number of sib1-nb repetitions within the 256 radio frames
uint32_t sib1_NB_period = 256; //from specs TS 36.331
#ifdef DEBUG_RRC
......@@ -240,46 +246,141 @@ int8_t NB_mac_rrc_data_req_eNB(
LOG_T(RRC,"[eNB %d] NB_mac_rrc_data_req_eNB to SRB ID=%d\n",Mod_idP,Srb_id);
#endif
if((Srb_id & RAB_OFFSET) == BCCH) {
//--------------------------
//for the moment we assume that this function is called in subframe #4 for both SIB1-NB and SIB23-NB
//*is better to introduce the logic in another function: is SIB1-NB? is SIB23-NB?
//--------------------------
if((Srb_id & RAB_OFFSET) == BCCH) { //schedule_SI case or MIB? put a flag??
//should be added the case of BCCH that return the size of the MIB-NB if subframe 0 --> add a flag?
if(eNB_rrc_inst_NB[Mod_idP].carrier[CC_id].SI.Active==0) {
return 0;
}
//I have to check which SIB is transmitted
if(schedulingInfoSIB1 > 11 || schedulingInfoSIB1 < 0){
LOG_E(RRC, "schedulingInfoSIB1 value incorrect");
return 0;
}
/*check if SIBs are initialized*/ //FIXME check when both are initialize and if make sense to have it
if (eNB_rrc_inst_NB[Mod_idP].carrier[CC_id].sizeof_SIB1_NB == 255) {
LOG_E(RRC,"[eNB %d] MAC Request for SIB1-NB and SIB1-NB not initialized\n",Mod_idP);
mac_xface->macphy_exit("mac_rrc_data_req: MAC Request for SIB1-NB and SIB1-NB not initialized");
}
//the entire scheduling of SIB1-NB is based on the SchedulingInfoSIB1 of MIB-NB
if (eNB_rrc_inst_NB[Mod_idP].carrier[CC_id].sizeof_SIB23_NB == 255) {
LOG_E(RRC,"[eNB %d] MAC Request for SIB23-NB and SIB23-NB not initialized\n",Mod_idP);
mac_xface->macphy_exit("mac_rrc_data_req: MAC Request for SIB23-NB and SIB23-NB not initialized");
}
//SIB1-NB transmission occurs in subframe #4 of every other frame in 16 continuous frames
//schedule with a periodicity of 2560 ms (256 Radio Frames) and repetitions (4, 8 or 16) are made, equally spaced,
//within the 2560 ms period
/*SIB1
*
* the entire scheduling of SIB1-NB is based on the SchedulingInfoSIB1 of MIB-NB
*
* SIB1-NB transmission occurs in subframe #4 of every other frame in 16 continuous frames (i.e. alternate frames)
* schedule with a periodicity of 2560 ms (256 Radio Frames) and repetitions (4, 8 or 16) are made, equally spaced
* within the 2560 ms period
*
* 1)from the schedulingInfoSIB1 of MIB-NB and the physCell_id we deduce the starting radio frame
* 2)check if the actual frame is after the staring radio frame
* 3)check if the actual frame is within a SIB1-transmission interval
* 4)based on the starting radio frame we can state when SIB1-NB is transmitted in odd or even frame
* (if the starting frame is even (0,16,32,48) then SIB1-NB is transmitted in even frames, if starting frame is odd (1)
* we can state that SIB1-NB will be transmitted in every odd frame since repetitions are 16 in 256 radio frame period)
*
**/
//Implementation: //FIXME should be checked if compatible if SIB23-NB scheduling
//SchedulingInfoSIB_r13 = 0 --> n�repetitions= 4 + NcelliD mod 4 = 1 --> start_sfn_sib1_Nb = 16
/*logic*/
//1) check if the current frame is before/after the starting frame of sib1-NB transmission
//2) check if the current frame is considered in the 16 continuous frame of sib1-NB transmission in the periodicity
//number of repetitions
nb_rep = npdsch_rep_to_array[schedulingInfoSIB1%3];
if(frameP < start_sfn_sib1_NB)
//based on number of rep. and the physical cell id we derive the starting radio frame (TS 36.213 Table 16.4.1.3-3/4)
switch(nb_rep)
{
case 4:
//physCellId%4 possible value are 0,1,2,3
sib1_startFrame = sib1_startFrame_to_array[physCellId%4];
break;
case 8:
//physCellId%2possible value are 0,1
sib1_startFrame = sib1_startFrame_to_array[physCellId%2];
break;
case 16:
//physCellId%2 possible value are 0,1
if(physCellId%2 == 0)
sib1_startFrame = 0;
else
sib1_startFrame = 1; // the only case in which the starting frame is odd
break;
default:
LOG_E(RRC, "Number of repetitions %d not allowed", nb_rep);
return 0;
}
//check the actual frame w.r.t SIB1-NB starting frame
//XXX--> it means that also is not possible to have scheduling of other sibs since their info are contained in sib1-NB???
if(frameP < sib1_startFrame){
LOG_T(RRC, 'the actual frame %d is before the SIB1-NB starting frame %d --> bcch_sdu_legnth = 0', frameP, sib1_startFrame);
return 0;
}
//calculate offset between SIB1-NB repetitions
int offset = (sib1_NB_period-(16*nb_sib1_NB_rep))/nb_sib1_NB_rep;
int offset = (sib1_NB_period-(16*nb_rep))/nb_rep;
/*
* possible offset results (even numbers):
* nb_rep= 4 ---> offset = 48
* nb_rep = 8 --> offset = 16
* nb_rep = 16 --> offset = 0
*/
for( int i = 0; i < nb_sib1_NB_rep; i++)
for( int i = 0; i < nb_rep; i++)
{
y = start_sfn_sib1_NB+ i*(16+offset);
if(frameP>= y && frameP <= (y+15)) //SIB1_NB transmission
//find the correct sib1-nb repetition interval in which the actual frame is
index = sib1_startFrame+ i*(16+offset);
if(frameP>= index && frameP <= (index+15)) //SIB1_NB transmission interval
{
//find if the actual frame is one of the "every other frame in 16 continuous frame" in which SIB1-NB is transmitted
if(sib1_startFrame%2 != 0){ // means that the starting frame was 1 --> sib1-NB is transmitted in every odd frame
if(frameP%2 == 1){
memcpy(&buffer_pP[0],
eNB_rrc_inst_NB[Mod_idP].carrier[CC_id].SIB1_NB,
eNB_rrc_inst_NB[Mod_idP].carrier[CC_id].sizeof_SIB1_NB);
//XXX RRC_MAC_BCCH_DATA_REQ message not implemented in MAC layer (eNB_scheduler.c under ITTI)
#ifdef DEBUG_RRC
LOG_T(RRC,"[eNB %d] Frame %d : BCCH request => SIB1_NB\n",Mod_idP,frameP);
for (i=0; i<eNB_rrc_inst_NB[Mod_idP].carrier[CC_id].sizeof_SIB1_NB; i++) {
LOG_T(RRC,"%x.",buffer_pP[i]);
}
LOG_T(RRC,"\n");
#endif
return (eNB_rrc_inst_NB[Mod_idP].carrier[CC_id].sizeof_SIB1_NB);
}
}
//in all other starting frame cases SIB1-NB is transmitted in the even frames inside the corresponding repetition interval
if(frameP%2 == 0){ // SIB1-NB is transmitted
memcpy(&buffer_pP[0],
eNB_rrc_inst_NB[Mod_idP].carrier[CC_id].SIB1_NB,
eNB_rrc_inst_NB[Mod_idP].carrier[CC_id].sizeof_SIB1_NB);
//XXX RRC_MAC_BCCH_DATA_REQ message not implemented in MAC layer (eNB_scheduler.c under ITTI)
#ifdef DEBUG_RRC
LOG_T(RRC,"[eNB %d] Frame %d : BCCH request => SIB1_NB\n",Mod_idP,frameP);
......@@ -293,16 +394,18 @@ int8_t NB_mac_rrc_data_req_eNB(
return (eNB_rrc_inst_NB[Mod_idP].carrier[CC_id].sizeof_SIB1_NB);
}
}
}
///if we are here means that is a SIB23-NB transmission
/*if we are here it means that we have SIB23-NB-Transmission??
//**for NB_IoT Implementations
//parameters that comes into play (defined in SIB1-NB):
//1_ si_windowlenght (w) (same for all SI messages) = 160 ms
//2_ si_radioFrameOffset (same for all SI messages) (not considered)
//3_ si_periodicity (T) = 64 rf
//4_ si_repetitionPattern = every2nd frame
//1_ si_windowlenght (w) (same for all SI messages)
//2_ si_radioFrameOffset (same for all SI messages) (set to 0 generally but depends on the starting radio frame of SIB1-NB)
//3_ si_periodicity (T)
//4_ si_repetitionPattern
/*logic (see TS 36.331 5.2.3a)*/
//since we have only 1 entry in the SchedulingInfoList (SIB23-NB) --> n=1
......@@ -361,6 +464,10 @@ int8_t NB_mac_rrc_data_req_eNB(
return (Sdu_size);
}
return(0);
}
......
openair2/RRC/LITE/proto_nb_iot.h
View file @ 4f5cc15c
......@@ -100,8 +100,8 @@ int8_t NB_mac_rrc_data_req_eNB(
const frame_t frameP,
const rb_id_t Srb_id,
uint8_t* const buffer_pP,
uint32_t start_sfn_sib1_NB, //starting frame for sib1 transmission
uint32_t nb_sib1_NB_rep, //number of sib1 repetitions
long schedulingInfoSIB1,//from the mib
int physCellId, //from the MAC instance-> common_channel
const frame_t h_frameP, //HSFN
long si_periodicity, //SI-periodicity
long si_windowLength //Si-windwolength
......
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