/******************************************************************************* 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 crĂȘtes, 06560 Valbonne Sophia Antipolis, France *******************************************************************************/ /*! \file PHY/LTE_TRANSPORT/group_hopping.c * \brief Top-level routines for group/sequence hopping and nPRS sequence generationg for DRS and PUCCH from 36-211, V8.6 2009-03 * \author R. Knopp * \date 2011 * \version 0.1 * \company Eurecom * \email: knopp@eurecom.fr * \note * \warning */ #include "PHY/defs.h" //#define DEBUG_GROUPHOP 1 void generate_grouphop(LTE_DL_FRAME_PARMS *frame_parms) { u8 ns; u8 reset=1; u32 x1, x2, s=0; // This is from Section 5.5.1.3 u32 fss_pusch = frame_parms->Nid_cell + frame_parms->pusch_config_common.ul_ReferenceSignalsPUSCH.groupAssignmentPUSCH; x2 = frame_parms->Nid_cell/30; #ifdef DEBUG_GROUPHOP msg("[PHY] GroupHop:"); #endif for (ns=0;ns<20;ns++) { if (frame_parms->pusch_config_common.ul_ReferenceSignalsPUSCH.groupHoppingEnabled == 0) frame_parms->pusch_config_common.ul_ReferenceSignalsPUSCH.grouphop[ns] = fss_pusch%30; else { if ((ns&3) == 0) { s = lte_gold_generic(&x1,&x2,reset); reset = 0; } frame_parms->pusch_config_common.ul_ReferenceSignalsPUSCH.grouphop[ns] = (((u8*)&s)[ns&3]+fss_pusch)%30; } #ifdef DEBUG_GROUPHOP msg("%d.",frame_parms->pusch_config_common.ul_ReferenceSignalsPUSCH.grouphop[ns]); #endif } #ifdef DEBUG_GROUPHOP msg("\n"); #endif } void generate_seqhop(LTE_DL_FRAME_PARMS *frame_parms) { u8 ns,reset=1; u32 x1, x2, s=0; // This is from Section 5.5.1.3 u32 fss_pusch = frame_parms->Nid_cell + frame_parms->pusch_config_common.ul_ReferenceSignalsPUSCH.groupAssignmentPUSCH; x2 = (32*(frame_parms->Nid_cell/30) + fss_pusch)%30; s = lte_gold_generic(&x1,&x2,reset); #ifdef DEBUG_GROUPHOP msg("[PHY] SeqHop:"); #endif for (ns=0;ns<20;ns++) { if ((frame_parms->pusch_config_common.ul_ReferenceSignalsPUSCH.groupHoppingEnabled == 0) && (frame_parms->pusch_config_common.ul_ReferenceSignalsPUSCH.sequenceHoppingEnabled == 1)) frame_parms->pusch_config_common.ul_ReferenceSignalsPUSCH.seqhop[ns] = (s>>(ns&0x1f))&1; else frame_parms->pusch_config_common.ul_ReferenceSignalsPUSCH.seqhop[ns] = 0; #ifdef DEBUG_GROUPHOP msg("%d.",frame_parms->pusch_config_common.ul_ReferenceSignalsPUSCH.seqhop[ns]); #endif } #ifdef DEBUG_GROUPHOP msg("\n"); #endif } void generate_nPRS(LTE_DL_FRAME_PARMS *frame_parms) { u16 n=0; u8 reset=1; u32 x1, x2, s=0; // This is from Section 5.5.1.3 u8 Nsymb_UL = (frame_parms->Ncp_UL == 0) ? 7 : 6; u16 next = 0; u8 ns=0; u32 fss_pusch = frame_parms->Nid_cell + frame_parms->pusch_config_common.ul_ReferenceSignalsPUSCH.groupAssignmentPUSCH; x2 = (32*(u32)(frame_parms->Nid_cell/30)) + fss_pusch; #ifdef DEBUG_GROUPHOP msg("[PHY] nPRS:"); #endif for (n=0;n<(20*Nsymb_UL);n++) { //loop over total number of bytes to generate if ((n&3) == 0) { s = lte_gold_generic(&x1,&x2,reset); reset = 0; // printf("n %d : s (%d,%d,%d,%d)\n",n,((u8*)&s)[0],((u8*)&s)[1],((u8*)&s)[2],((u8*)&s)[3]); } if (n == next) { frame_parms->pusch_config_common.ul_ReferenceSignalsPUSCH.nPRS[ns] = ((u8*)&s)[next&3]; #ifdef DEBUG_GROUPHOP msg("%d.",frame_parms->pusch_config_common.ul_ReferenceSignalsPUSCH.nPRS[ns]); #endif ns++; next+=Nsymb_UL; } } #ifdef DEBUG_GROUPHOP msg("\n"); #endif } void init_ul_hopping(LTE_DL_FRAME_PARMS *frame_parms) { generate_grouphop(frame_parms); generate_seqhop(frame_parms); generate_nPRS(frame_parms); }