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Support for long PRACH formats

Sakthivel Velumani requested to merge ue-long-prach into develop

PRACH formats with sequence length of 839 could extend beyond one slot. This MR contains changes to MAC and PHY to retain PRACH configuration information over multiple slots. The changes are made to both gNB and UE. gNB is tested with COTS UE and OAI UE for format 0.

To test the long format, apply the following changes to a config file.

diff --git a/targets/PROJECTS/GENERIC-NR-5GC/CONF/gnb.sa.band78.fr1.106PRB.usrpb210.conf b/targets/PROJECTS/GENERIC-NR-5GC/CONF/gnb.sa.band78.fr1.106PRB.usrpb210.conf
index 9d789b9c40..65e7b7b5a9 100644
--- a/targets/PROJECTS/GENERIC-NR-5GC/CONF/gnb.sa.band78.fr1.106PRB.usrpb210.conf
+++ b/targets/PROJECTS/GENERIC-NR-5GC/CONF/gnb.sa.band78.fr1.106PRB.usrpb210.conf
@@ -68,7 +68,7 @@ gNBs =
         initialULBWPsubcarrierSpacing                               = 1;
       #rach-ConfigCommon
         #rach-ConfigGeneric
-          prach_ConfigurationIndex                                  = 98;
+          prach_ConfigurationIndex                                  = 7;
 #prach_msg1_FDM
 #0 = one, 1=two, 2=four, 3=eight
           prach_msg1_FDM                                            = 0;
@@ -96,9 +96,6 @@ gNBs =
 #1 = 839, 2 = 139
         prach_RootSequenceIndex_PR                                  = 2;
         prach_RootSequenceIndex                                     = 1;
-        # SCS for msg1, can only be 15 for 30 kHz < 6 GHz, takes precendence over the one derived from prach-ConfigIndex
-        #
-        msg1_SubcarrierSpacing                                      = 1,
 # restrictedSetConfig
 # 0=unrestricted, 1=restricted type A, 2=restricted type B
         restrictedSetConfig                                         = 0,

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