From c5734aa110263d91360d868fe233ed4bfe2d20b4 Mon Sep 17 00:00:00 2001 From: Thomas Schlichter Date: Mon, 8 Feb 2021 14:02:12 +0100 Subject: [PATCH] NR_UE: slightly cleanup PRACH generation --- openair1/PHY/NR_UE_TRANSPORT/nr_prach.c | 157 ++++++++++-------------- 1 file changed, 68 insertions(+), 89 deletions(-) diff --git a/openair1/PHY/NR_UE_TRANSPORT/nr_prach.c b/openair1/PHY/NR_UE_TRANSPORT/nr_prach.c index 9ce49cd4b7..fe62b4cacc 100644 --- a/openair1/PHY/NR_UE_TRANSPORT/nr_prach.c +++ b/openair1/PHY/NR_UE_TRANSPORT/nr_prach.c @@ -244,86 +244,58 @@ int32_t generate_nr_prach(PHY_VARS_NR_UE *ue, uint8_t gNB_id, uint8_t slot){ *********************************************************/ if (mu==1) { - if (fp->N_RB_UL <= 100) - AssertFatal(1 == 0, "N_RB_UL %d not support for NR PRACH yet\n", fp->N_RB_UL); - else if (fp->N_RB_UL < 137) { - if (fp->threequarter_fs == 0) { - //40 MHz @ 61.44 Ms/s - //50 MHz @ 61.44 Ms/s + switch(fp->samples_per_subframe) { + case 46080: + // 40 MHz @ 46.08 Ms/s if (prach_sequence_length == 0) { - if (prach_fmt_id == 0 || prach_fmt_id == 1 || prach_fmt_id == 2) - dftlen = 49152; - if (prach_fmt_id == 3) - dftlen = 12288; - } // 839 sequence - else { - switch (mu){ - case 1: - dftlen = 2048; - break; - default: - AssertFatal(1 == 0, "Shouldn't get here\n"); - break; - } - } - } else { // threequarter sampling - // 40 MHz @ 46.08 Ms/s - if (prach_sequence_length == 0) { - AssertFatal(fp->N_RB_UL <= 107, "cannot do 108..136 PRBs with 3/4 sampling\n"); if (prach_fmt_id == 0 || prach_fmt_id == 1 || prach_fmt_id == 2) dftlen = 36864; if (prach_fmt_id == 3) dftlen = 9216; - } else { - switch (mu){ - case 1: - dftlen = 1536; - break; - default: - AssertFatal(1 == 0, "Shouldn't get here\n"); - break; - } - } // short format - } // 3/4 sampling - } // <=50 MHz BW - else if (fp->N_RB_UL <= 273) { - if (fp->threequarter_fs == 0) { - //80,90,100 MHz @ 122.88 Ms/s + } else { // 839 sequence + dftlen = 1536; + } + break; + + case 61440: + // 40, 50, 60 MHz @ 61.44 Ms/s + if (prach_sequence_length == 0) { + if (prach_fmt_id == 0 || prach_fmt_id == 1 || prach_fmt_id == 2) + dftlen = 49152; + if (prach_fmt_id == 3) + dftlen = 12288; + } else { // 839 sequence + dftlen = 2048; + } + break; + + case 92160: + // 50, 60, 70, 80, 90 MHz @ 92.16 Ms/s + if (prach_sequence_length == 0) { + if (prach_fmt_id == 0 || prach_fmt_id == 1 || prach_fmt_id == 2) + dftlen = 73728; + if (prach_fmt_id == 3) + dftlen = 18432; + } else { // 839 sequence + dftlen = 3072; + } + break; + + case 122880: + // 70, 80, 90, 100 MHz @ 122.88 Ms/s if (prach_sequence_length == 0) { if (prach_fmt_id == 0 || prach_fmt_id == 1 || prach_fmt_id == 2) dftlen = 98304; if (prach_fmt_id == 3) dftlen = 24576; + } else { // 839 sequence + dftlen = 4096; } - } else { // threequarter sampling - switch (mu){ - case 1: - dftlen = 4096; - break; - default: - AssertFatal(1 == 0, "Shouldn't get here\n"); - break; - } + break; + + default: + AssertFatal(1==0,"sample rate %f MHz not supported for numerology %d\n", fp->samples_per_subframe / 1000.0, mu); } - } else { - AssertFatal(fp->N_RB_UL <= 217, "cannot do more than 217 PRBs with 3/4 sampling\n"); - // 80 MHz @ 92.16 Ms/s - if (prach_sequence_length == 0) { - if (prach_fmt_id == 0 || prach_fmt_id == 1 || prach_fmt_id == 2) - dftlen = 73728; - if (prach_fmt_id == 3) - dftlen = 18432; - } else { - switch (mu){ - case 1: - dftlen = 3072; - break; - default: - AssertFatal(1 == 0, "Shouldn't get here\n"); - break; - } - } - } } else if (mu==3) { if (fp->threequarter_fs) @@ -432,8 +404,9 @@ int32_t generate_nr_prach(PHY_VARS_NR_UE *ue, uint8_t gNB_id, uint8_t slot){ use_extended_prach_prefix = 1; } - if (fp->N_RB_UL <= 34) { //32 PRB case 61.44Msps - if (fp->threequarter_fs == 0) { + if (mu == 3) { + switch (fp->samples_per_subframe) { + case 61440: // 32 PRB case, 61.44 Msps Ncp<<=1; //to account for 61.44Mbps // This is after cyclic prefix prach2 = prach+(Ncp<<1); //times 2 for complex samples @@ -491,13 +464,9 @@ int32_t generate_nr_prach(PHY_VARS_NR_UE *ue, uint8_t gNB_id, uint8_t slot){ prach_len = (512*12)+Ncp; } } - } - else - AssertFatal(1==0,"3/4 sampling not supported for this PRACH size %d\n",fp->N_RB_UL); - - } - else if (fp->N_RB_UL <= 68) {//66 PRB case, 122.88 Msps - if (fp->threequarter_fs == 0) { + break; + + case 122880: // 66 PRB case, 122.88 Msps Ncp<<=2; //to account for 122.88Mbps // This is after cyclic prefix prach2 = prach+(Ncp<<1); //times 2 for complex samples @@ -555,13 +524,15 @@ int32_t generate_nr_prach(PHY_VARS_NR_UE *ue, uint8_t gNB_id, uint8_t slot){ prach_len = (1024*12)+Ncp; } } + break; + + default: + AssertFatal(1==0,"sample rate %f MHz not supported for numerology %d\n", fp->samples_per_subframe / 1000.0, mu); } - else - AssertFatal(1==0,"3/4 sampling not supported for this PRACH size %d\n",fp->N_RB_UL); - } - else if (fp->N_RB_UL < 137) { // 46.08 or 61.44 Ms/s - if (fp->threequarter_fs == 0) { // full sampling @ 61.44 Ms/s - Ncp<<=1; //to account for 61.44Mbps + } else if (mu == 1) { + switch (fp->samples_per_subframe) { + case 61440: // full sampling @ 61.44 Ms/s + Ncp = Ncp*2; // to account for 61.44 Ms/s // This is after cyclic prefix prach2 = prach+(Ncp<<1); //times 2 for complex samples if (prach_sequence_length == 0){ @@ -587,7 +558,7 @@ int32_t generate_nr_prach(PHY_VARS_NR_UE *ue, uint8_t gNB_id, uint8_t slot){ memmove(prach,prach+(49152<<3),(Ncp<<2)); // here we have |Prefix | Prach49152 | Prach49152| Prach49152 | Prach49152 prach_len = (49152*4)+Ncp; - } else if (prach_fmt_id == 3) { // //6144 samples @ 30.72 Ms/s, 12288 samples @ 61.44 Ms/s + } else if (prach_fmt_id == 3) { // 6144 samples @ 30.72 Ms/s, 12288 samples @ 61.44 Ms/s idft(IDFT_12288,prachF,prach2,1); memmove(prach2+(12288<<1),prach2,(12288<<2)); // here we have |empty | Prach12288 | Prach12288| empty12288 | empty12288 @@ -649,7 +620,9 @@ int32_t generate_nr_prach(PHY_VARS_NR_UE *ue, uint8_t gNB_id, uint8_t slot){ prach_len = (2048*12)+Ncp; } } - } else { // threequarter sampling @ 46.08 Ms/s + break; + + case 46080: // threequarter sampling @ 46.08 Ms/s Ncp = (Ncp*3)/2; prach2 = prach+(Ncp<<1); if (prach_sequence_length == 0){ @@ -738,9 +711,9 @@ int32_t generate_nr_prach(PHY_VARS_NR_UE *ue, uint8_t gNB_id, uint8_t slot){ prach_len = (1536*12)+Ncp; } } - } - } else if (fp->N_RB_UL <= 273) {// 92.16 or 122.88 Ms/s - if (fp->threequarter_fs == 0) { // full sampling @ 122.88 Ms/s + break; + + case 122880: // full sampling @ 122.88 Ms/s Ncp<<=2; //to account for 122.88Mbps // This is after cyclic prefix prach2 = prach+(Ncp<<1); //times 2 for complex samples @@ -828,7 +801,9 @@ int32_t generate_nr_prach(PHY_VARS_NR_UE *ue, uint8_t gNB_id, uint8_t slot){ prach_len = (4096*12)+Ncp; } } - } else { // three quarter sampling @ 92.16 Ms/s + break; + + case 92160: // three quarter sampling @ 92.16 Ms/s Ncp = (Ncp*3); //to account for 92.16 Msps prach2 = prach+(Ncp<<1); //times 2 for complex samples if (prach_sequence_length == 0){ @@ -915,6 +890,10 @@ int32_t generate_nr_prach(PHY_VARS_NR_UE *ue, uint8_t gNB_id, uint8_t slot){ prach_len = (3072*12)+Ncp; } } + break; + + default: + AssertFatal(1==0,"sample rate %f MHz not supported for numerology %d\n", fp->samples_per_subframe / 1000.0, mu); } }