Attempt to reset timer regardless of N310

srsue/hdr/upper/rrc.h

@@ -127,6 +127,8 @@ private:
 
   // RRC constants and timers
   srslte::mac_interface_timers *mac_timers;
+  uint32_t sync_reset_cnt;
+  const static uint32_t SYNC_RESET_TIMEOUT = 10;
   uint32_t n310_cnt, N310;
   uint32_t n311_cnt, N311;
   uint32_t t301, t310, t311;

srsue/src/upper/rrc.cc

@@ -48,6 +48,9 @@ rrc::rrc()
   :state(RRC_STATE_IDLE)
   ,drb_up(false)
 {
+  sync_reset_cnt = 0;
+  n310_cnt       = 0;
+  n311_cnt       = 0;
 }
 
 static void liblte_rrc_handler(void *ctx, char *str) {
@@ -489,13 +492,17 @@ void rrc::earfcn_end() {
 
 // Detection of physical layer problems (5.3.11.1)
 void rrc::out_of_sync() {
+  // attempt resync
+  sync_reset_cnt++;
+  if (sync_reset_cnt >= SYNC_RESET_TIMEOUT) {
+    rrc_log->info("Detected %d out-of-sync from PHY. Resynchronizing PHY.\n", sync_reset_cnt);
+    phy->sync_reset();
+    sync_reset_cnt = 0;
+  }
   current_cell->in_sync = false;
   if (!mac_timers->timer_get(t311)->is_running() && !mac_timers->timer_get(t310)->is_running()) {
     n310_cnt++;
     if (n310_cnt == N310) {
-      // attempt resync
-      //phy->sync_reset();
-
       mac_timers->timer_get(t310)->reset();
       mac_timers->timer_get(t310)->run();
       n310_cnt = 0;