geonet: configurable initial beacon delay

riebl · Jul 4, 2024 · 0fdb37b · 0fdb37b
1 parent 067c01a
commit 0fdb37b
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Showing 3 changed files with 8 additions and 8 deletions.
diff --git a/vanetza/geonet/mib.cpp b/vanetza/geonet/mib.cpp
@@ -50,7 +50,7 @@ ManagementInformationBase::ManagementInformationBase() :
     itsGnDefaultTrafficClass(false, false, 0),
     vanetzaDefaultSeed(0xc0114c2c),
     vanetzaCbfMaxCounter(1),
-    vanetzaDeferInitialBeacon(false),
+    vanetzaDeferInitialBeacon(Clock::duration::zero()),
     vanetzaDisableBeaconing(false),
     vanetzaMultiHopDuplicateAddressDetection(false),
     vanetzaFadingCbfCounter(false),

diff --git a/vanetza/geonet/mib.hpp b/vanetza/geonet/mib.hpp
@@ -94,7 +94,7 @@ struct ManagementInformationBase
     TrafficClass itsGnDefaultTrafficClass;
     std::uint32_t vanetzaDefaultSeed; /*< default seed for internal random number generator */
     std::size_t vanetzaCbfMaxCounter; /*< maximum counter value used for Advanced routing */
-    bool vanetzaDeferInitialBeacon; /*< defer first beacon up to itsGnBeaconServiceRetransmitTimer */
+    Clock::duration vanetzaDeferInitialBeacon; /*< defer first beacon by given duration */
     bool vanetzaDisableBeaconing; /*< disable transmission of beacons entirely */
     bool vanetzaMultiHopDuplicateAddressDetection; /*< execute DAD for multi-hop packets */
     bool vanetzaFadingCbfCounter; /*< use fading counters for CBF packet buffer */

diff --git a/vanetza/geonet/router.cpp b/vanetza/geonet/router.cpp
@@ -145,14 +145,14 @@ Router::Router(Runtime& rt, const MIB& mib) :
     m_random_gen(mib.vanetzaDefaultSeed)
 {
     if (!m_mib.vanetzaDisableBeaconing) {
-        if (!m_mib.vanetzaDeferInitialBeacon) {
+        if (m_mib.vanetzaDeferInitialBeacon > Clock::duration::zero()) {
+            // defer initial Beacon transmission by given duration plus jitter
+            std::uniform_real_distribution<double> dist_jitter(0.0, 1.0);
+            const auto jitter = clock_cast(dist_jitter(m_random_gen) * m_mib.itsGnBeaconServiceMaxJitter);
+            reset_beacon_timer(m_mib.vanetzaDeferInitialBeacon + jitter);
+        } else {
             // send Beacon immediately after start-up at next runtime trigger invocation
             reset_beacon_timer(Clock::duration::zero());
-        } else {
-            // defer initial Beacon transmission slightly
-            std::uniform_real_distribution<double> dist(0.0, 1.0);
-            const auto first_beacon = dist(m_random_gen) * m_mib.itsGnBeaconServiceRetransmitTimer;
-            reset_beacon_timer(clock_cast(first_beacon));
         }
     }