diff --git a/scheduler/schedule.cpp b/scheduler/schedule.cpp
index 36d1385..40470c2 100644
--- a/scheduler/schedule.cpp
+++ b/scheduler/schedule.cpp
@@ -664,6 +664,18 @@ SensorScheduler::SensorScheduler() {
         } else {
             xy_wave_start_id = max_sensor_num_ + 1;
         }
+
+        if (max_sensor_num_ == 2 && free_slice_ == 0) {
+            xy_wave_start_id = 2;
+        }
+
+        if (max_sensor_num_ == 1 && free_slice_ == 0) {
+            if (available_slice_ == 2) {
+                xy_wave_start_id = 1;
+            } else if (available_slice_ == 4) {
+                xy_wave_start_id = 2;
+            }
+        }
         for (int i = 1; i <= max_sensor_num_; ++i) { 
             sensor_id_nth_slice_[i] =  { i, i + xy_wave_start_id };
             slice_sensor_id_[i] = i;