Commit 0da0ce36 authored by knopp's avatar knopp

added pch.c

parent 6d46b31b
/*******************************************************************************
OpenAirInterface
Copyright(c) 1999 - 2014 Eurecom
OpenAirInterface is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
OpenAirInterface is distributed in the hope that 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 OpenAirInterface.The full GNU General Public License is
included in this distribution in the file called "COPYING". If not,
see <http://www.gnu.org/licenses/>.
Contact Information
OpenAirInterface Admin: openair_admin@eurecom.fr
OpenAirInterface Tech : openair_tech@eurecom.fr
OpenAirInterface Dev : openair4g-devel@lists.eurecom.fr
Address : Eurecom, Campus SophiaTech, 450 Route des Chappes, CS 50193 - 06904 Biot Sophia Antipolis cedex, FRANCE
*******************************************************************************/
#include "PHY/defs.h"
#include "PHY/extern.h"
#include "assertions.h"
const unsigned int Ttab[4] = {32,64,128,256};
// This function implements the initialization of paging parameters for UE (See Section 7, 36.304)
// It must be called after setting IMSImod1024 during UE startup and after receiving SIB2
int init_ue_paging_info(PHY_VARS_UE *ue, long defaultPagingCycle, long nB) {
LTE_DL_FRAME_PARMS *fp = &ue->frame_parms;
unsigned int T = Ttab[defaultPagingCycle];
unsigned int N = (nB<=2) ? T : (T>>(nB-2));
unsigned int Ns = (nB<2) ? (1<<(2-nB)) : 1;
unsigned int UE_ID = ue->IMSImod1024;
unsigned int i_s = (UE_ID/N)%Ns;
ue->PF = (T/N) * (UE_ID % N);
// This implements Section 7.2 from 36.304
if (Ns==1)
ue->PO = (fp->frame_type==FDD) ? 9 : 0;
else if (Ns==2)
ue->PO = (fp->frame_type==FDD) ? (4+(5*i_s)) : (5*i_s);
else if (Ns==4)
ue->PO = (fp->frame_type==FDD) ? (4*(i_s&1)+(5*(i_s>>1))) : ((i_s&1)+(5*(i_s>>1)));
else
AssertFatal(1==0,"init_ue_paging_info: Ns is %d\n",Ns);
return(0);
}
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