diff --git a/scheduler/schedule.cpp b/scheduler/schedule.cpp
index 40470c2..fe24b20 100644
--- a/scheduler/schedule.cpp
+++ b/scheduler/schedule.cpp
@@ -961,6 +961,18 @@ int SensorScheduler::WriteScheduleCfg(long &ts, std::string &world_time) {
         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;