diff --git a/app/src/main/java/com/example/medilightv2android/ble/BleManager.kt b/app/src/main/java/com/example/medilightv2android/ble/BleManager.kt
index 6c20636..dfd5f61 100644
--- a/app/src/main/java/com/example/medilightv2android/ble/BleManager.kt
+++ b/app/src/main/java/com/example/medilightv2android/ble/BleManager.kt
@@ -308,6 +308,7 @@ class BleManager private constructor(private val context: Context) {
             onReconnectionFailed?.invoke()
             return
         }
+        
 
         // Stop any active reconnect scan first
         reconnectScanCallback?.let { cb ->
@@ -835,6 +836,13 @@ class BleManager private constructor(private val context: Context) {
                     if (status == BluetoothGatt.GATT_SUCCESS) {
                         if (txCharacteristic != null && rxCharacteristic != null) {
                             isServiceReady.value = true
+                            // Connection priority HIGH 요청: peripheral이 수락하면 interval ~15ms로 협상되어
+                            // Central Link Layer ACK 속도 ↑ → FW SoftDevice TX queue 포화 빈도 ↓
+                            val priorityOk = try {
+                                gatt.requestConnectionPriority(BluetoothGatt.CONNECTION_PRIORITY_HIGH)
+                            } catch (_: Exception) { false }
+                            logd { "requestConnectionPriority(HIGH) → $priorityOk" }
+                            debugLogger.info("CONN_PRIORITY HIGH requested (ok=$priorityOk)")
                             com.example.medilightv2android.services.AdcCsvLogger.newSession()
                             com.example.medilightv2android.services.BleForegroundService.start(context)
                             startBatteryPolling()