commit a8b3565246ce4c36cba07b1ebdefa45b895de78f
author Vadim Yanitskiy <axilirator@gmail.com> Mon Oct 22 02:52:18 2018 +0200
committer Max <msuraev@sysmocom.de> Thu Jan 24 15:47:48 2019 +0100
tree c19b97d1557d4531079fb4ba748015beb6b45f0e
parent a3934a11a4a9cd7f510cc188192bf27302695ef5

VTY: add extended (11-bit) RACH detection toggle

Since I838c21db29c54f1924dd478c2b34b46b70aab2cd we have both TS1
and TS2 synch. sequences, in addition to "default" TS0. Let's
finally introduce the VTY configuration parameter, that can
be used to toggle optional detection of both TS1 and TS2.

Note: we keep this optional because of potentially bad impact on
performance. There's no point in paying the performance penalty
unless upper levels (BTS, PCU) actually make use of it.

Change-Id: I1aee998d83b06692d76a83f79748f9129a2547e8
Related: OS#3054

Transceiver52M/Transceiver.cpp

diff --git a/Transceiver52M/Transceiver.cpp b/Transceiver52M/Transceiver.cpp
index df1c0bd..cfb36c3 100644
--- a/Transceiver52M/Transceiver.cpp
+++ b/Transceiver52M/Transceiver.cpp
@@ -159,7 +159,8 @@
  * are still expected to report clock indications through control channel
  * activity.
  */
-bool Transceiver::init(FillerType filler, size_t rtsc, unsigned rach_delay, bool edge)
+bool Transceiver::init(FillerType filler, size_t rtsc, unsigned rach_delay,
+                       bool edge, bool ext_rach)
 {
   int d_srcport, d_dstport, c_srcport, c_dstport;
 
@@ -173,6 +174,7 @@
     return false;
   }
 
+  mExtRACH = ext_rach;
   mEdge = edge;
 
   mDataSockets.resize(mChans);
@@ -497,16 +499,16 @@
     break;
   case IV:
   case VI:
-    return RACH;
+    return mExtRACH ? EXT_RACH : RACH;
     break;
   case V: {
     int mod51 = burstFN % 51;
     if ((mod51 <= 36) && (mod51 >= 14))
-      return RACH;
+      return mExtRACH ? EXT_RACH : RACH;
     else if ((mod51 == 4) || (mod51 == 5))
-      return RACH;
+      return mExtRACH ? EXT_RACH : RACH;
     else if ((mod51 == 45) || (mod51 == 46))
-      return RACH;
+      return mExtRACH ? EXT_RACH : RACH;
     else if (mHandover[burstTN][sdcch4_subslot[burstFN % 102]])
       return RACH;
     else
@@ -524,7 +526,7 @@
   case XIII: {
     int mod52 = burstFN % 52;
     if ((mod52 == 12) || (mod52 == 38))
-      return RACH;
+      return mExtRACH ? EXT_RACH : RACH;
     else if ((mod52 == 25) || (mod52 == 51))
       return IDLE;
     else
@@ -635,9 +637,11 @@
     noise = 20.0 * log10(rxFullScale / state->mNoiseLev);
   }
 
+  unsigned max_toa = (type == RACH || type == EXT_RACH) ?
+                      mMaxExpectedDelayAB : mMaxExpectedDelayNB;
+
   /* Detect normal or RACH bursts */
-  rc = detectAnyBurst(*burst, mTSC, BURST_THRESH, mSPSRx, type, amp, toa,
-                      (type==RACH)?mMaxExpectedDelayAB:mMaxExpectedDelayNB);
+  rc = detectAnyBurst(*burst, mTSC, BURST_THRESH, mSPSRx, type, amp, toa, max_toa);
 
   if (rc > 0) {
     type = (CorrType) rc;