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diff --git a/inc/bluetooth/profile/server/lls.h b/inc/bluetooth/profile/server/lls.h
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+/**
+*****************************************************************************************
+*     Copyright(c) 2017, Realtek Semiconductor Corporation. All rights reserved.
+*****************************************************************************************
+  * @file     lls.h
+  * @brief    Head file for using link loss service.
+  * @details  LLS data structs and external functions declaration.
+  * @author
+  * @date
+  * @version  v1.0
+  * *************************************************************************************
+  */
+
+/* Define to prevent recursive inclusion */
+#ifndef _LLS_H_
+#define _LLS_H_
+
+#ifdef  __cplusplus
+extern "C" {
+#endif      /* __cplusplus */
+
+/* Add Includes here */
+#include "profile_server.h"
+
+/** @defgroup LLS Link Loss Service
+  * @brief Link loss service
+  * @details
+
+    The Link Loss Service (LLS) defines behavior when a link is lost between two devices.
+
+    The Link Loss Service uses the Alert Level characteristic to cause an alert in the device
+    when the link is lost.
+
+    Link Loss Service generally constitutes a profile collectively with other Services, such
+    as Proximity or Find Me etc., which enables device to cause an alert when the link is lost.
+
+    Application shall register link loss service when initialization through @ref lls_add_service function.
+
+    Application can set LLS alert level value through @ref lls_set_parameter function.
+
+  * @{
+  */
+/*============================================================================*
+ *                              Macros
+ *============================================================================*/
+/** @defgroup LLS_Exported_Macros LLS Service Exported Macros
+  * @brief
+  * @{
+  */
+
+/** @defgroup LLS_Read_Info LLS Read Info
+  * @brief  Read characteristic value.
+  * @{
+  */
+#define LLS_READ_ALERT_LEVEL 1
+/** @} */
+
+/** @} End of LLS_Exported_Macros */
+
+/*============================================================================*
+ *                              Types
+ *============================================================================*/
+
+/** @defgroup LLS_Exported_Types LLS Exported Types
+  * @brief
+  * @{
+  */
+
+/** @defgroup LLS_PARAM_TYPE LLS Parameter Type
+* @brief Type of parameters set from application.
+* @{
+*/
+typedef enum
+{
+    LLS_PARAM_LINK_LOSS_ALERT_LEVEL
+} T_LLS_PARAM_TYPE;
+/** @} */
+
+/** @defgroup LLS_Callback_Data LLS Callback Data
+  * @brief LLS data struct for notification data to application.
+  * @{
+  */
+/** Message content: @ref T_LLS_CALLBACK_DATA */
+typedef union
+{
+    uint8_t read_value_index;
+    uint8_t write_alert_level;
+} T_LLS_UPSTREAM_MSG_DATA;
+
+/** LLSdata service data to inform application */
+typedef struct
+{
+    uint8_t                 conn_id;
+    T_SERVICE_CALLBACK_TYPE msg_type;
+    T_LLS_UPSTREAM_MSG_DATA msg_data;
+} T_LLS_CALLBACK_DATA;
+/** @} */
+
+/** @} End of LLS_Exported_Types */
+
+/*============================================================================*
+ *                              Functions
+ *============================================================================*/
+
+/** @defgroup LLS_Exported_Functions LLS Exported Functions
+  * @brief
+  * @{
+  */
+
+/**
+ * @brief       Set a link loss service parameter.
+ *
+ *              NOTE: You can call this function with a link loss service parameter type and it will set the
+ *                      link loss service parameter. Link loss service parameters are defined in @ref T_LLS_PARAM_TYPE.
+ *                      If the "len" field sets to the size of a "uint16_t" ,the
+ *                      "p_value" field must point to a data with type of "uint16_t".
+ *
+ * @param[in]   param_type   Link loss service parameter type: @ref T_LLS_PARAM_TYPE
+ * @param[in]   length       Length of data to write
+ * @param[in]   p_value Pointer to data to write.  This is dependent on
+ *                      the parameter type and WILL be cast to the appropriate
+ *                      data type (For example: if data type of param is uint16_t, p_value will be cast to
+ *                      pointer of uint16_t).
+ *
+ * @return Operation result.
+ * @retval true Operation success.
+ * @retval false Operation failure.
+ */
+bool lls_set_parameter(T_LLS_PARAM_TYPE param_type, uint8_t length, void *p_value);
+
+/**
+  * @brief Add link loss service to the BLE stack database.
+  *
+  * @param[in]   p_func  Callback when service attribute was read, write or cccd update.
+  * @return Service id generated by the BLE stack: @ref T_SERVER_ID.
+  * @retval 0xFF Operation failure.
+  * @retval others Service id assigned by stack.
+  *
+  * <b>Example usage</b>
+  * \code{.c}
+    void profile_init()
+    {
+        server_init(1);
+        lls_id = lls_add_service(app_handle_profile_message);
+    }
+  * \endcode
+  */
+T_SERVER_ID lls_add_service(void *p_func);
+/** @} End of LLS_Exported_Functions */
+
+/** @} End of LLS*/
+
+
+#ifdef  __cplusplus
+}
+#endif      /*  __cplusplus */
+
+#endif
+