Abstract:
A method and system to receive the secondary notification messages when an ETWS primary notification message is received in connected mode of UE are provided. The method includes the way to receive the secondary notification information in UE. The secondary notification information comprises necessary associated information of the ETWS like government aid, help centers, health centers, and refugee camps and so on to help the user in many ways to combat the situation. The method discloses different ways of transition to idle mode to receive the secondary notification message according to configuration defined by the user within the UE.

Description:
CROSS-REFERENCE TO RELATED APPLICATION(S) 
       [0001]    This application claims the benefit under 35 U.S.C. §119(a) of an Indian patent application filed on Aug. 10, 2012 in the Indian Intellectual Property Office and assigned Serial No. 3306/CHE/2012, the entire disclosure of which is hereby incorporated by reference. 
       TECHNICAL FIELD 
       [0002]    The present disclosure relates to the field of Universal Mobile Telecommunications System (UMTS). More particularly, the present disclosure relates to receiving a secondary notification by a User Equipment (UE) when an Earthquake and Tsunami Warning System (ETWS) message is delivered in connected mode to the UE. 
       BACKGROUND 
       [0003]    With advances in technology, mobile devices are playing a key role in our day to day life. The affordability of mobile devices in conjunction with the advances in technology has enabled most people to own a smart phone. Moreover, the introduction of user friendly operating systems into the consumer handset market enables most people to use a smart phone more efficiently than ever before. As a result, such devices have been used all over the world. 
         [0004]    Although smart phones now have many applications in various fields such as multimedia, entertainment, gaming and so on. The main use of these devices is still to achieve communication, either using voice or data. In today&#39;s world, most smart phone users possess an email account, and would want to access these services on their handheld devices. 
         [0005]    Today, there is work ongoing to provide different types of public warning systems. For example, support for an ETWS, enabling transmission of warning notifications about coming earthquakes and/or tsunamis to a UE through the network is ongoing. The ETWS warning notifications may be divided into a primary notification and a secondary notification. The primary notification is sent in order to notify users about the most urgent event in seconds rather than minutes, such as imminent occurrence of an earthquake and the like. There are requirements to reach the users with an ETWS primary notification message within 4 seconds. In order to avoid fake messages, inclusion of authentication or security check information is also provided in the primary notification. The secondary notification is sent to give users supplementary information that is of lesser urgency, such as instructions on what to do, where to get help, a map to refuge facilities, a time table of food distribution, and the like. 
         [0006]    ETWS primary notification information can be delivered to the UE in all its states through messages defined in UMTS, Global System for Mobile communications (GSM), and Long Term Evolution (LTE). However, when the UE is in connected mode (either Dedicated CHannel (i.e., DCH) or Forward Access CHannel (i.e., FACH) states) because of either Circuit Switching (CS) or Packet Switching (PS), 3rd Generation Partnership Project (3GPP) specifications in UMTS do not explain how to receive the secondary notification through Cell Broadcasting Service (CBS) messages in these states. CBS messages (secondary notification messages) are received only in idle mode or cell Paging CHannel (CELL_PCH) or Universal Terrestrial Radio Access Network (UTRAN) Registration Area Paging CHannel (URA_PCH) states of a UE. In an existing system, it is left to the implementation of the UE on how to go to idle mode or CELL_PCH or URA_PCH states to receive the secondary notification when the UE receives the ETWS Message in either DCH or FACH states. Further, it is also left to the network implementation whether to release all the calls of the UEs, if they are connected and move them to idle mode/CELL_PCH/URA_PCH states or not. 
         [0007]    Due to above mentioned reasons, it is evident that the existing system lacks a method that is used by the UE to go to idle mode or CELL_PCH or URA_PCH state to receive secondary notification CBS messages when ETWS messages are received either in DCH or in FACH states of the UE. 
         [0008]    The above information is presented as background information only to assist with an understanding of the present disclosure. No determination has been made, and no assertion is made, as to whether any of the above might be applicable as prior art with regard to the present disclosure. 
       SUMMARY 
       [0009]    Aspects of the present disclosure are to address at least the above-mentioned problems and/or disadvantages and to provide at least the advantages described below. Accordingly, an aspect of the present disclosure is to provide a method and system that guides a User Equipment (UE) to take appropriate steps to enter an idle mode where it can receive a secondary notification through Cell Broadcasting Service (CBS) messages when the UE receives an Earthquake and Tsunami Warning System (ETWS) message while it is in connected mode (i.e., Dedicated CHannel (DCH) or Forward Access CHannel (FACH) states). 
         [0010]    Another aspect of the present disclosure is to provide a method for a UE to switch to an idle mode to receive a secondary notification message when it is in either a DCH state or a FACH state. 
         [0011]    In accordance with an aspect of the present disclosure, a method for enabling state transition to idle mode for reception of secondary notifications of an Earthquake and Tsunami Warning System (ETWS) message when a communication device receives an ETWS primary notification, when the device is in connected mode, is provided. The method includes sending a Signaling Connection Release Indication (SCRI) message to a network with a cause which indicates request to release RRC connection to move to IDLE mode, receiving a Radio Resource Control (RRC) connection release message from the network, and switching to idle mode from the connected mode for receiving the secondary notification from the network. 
         [0012]    In accordance with another aspect of the present disclosure, a communication device for receiving secondary notification of an ETWS message, when the device is in connected mode, is provided. The communication device includes an integrated circuit having at least one processor, at least one memory having a computer program code within the integrated circuit, the at least one memory and the computer program code configured to, with the at least one processor, cause the device to send an SCRI message to a network with a cause, receive an RRC connection release message from the network, and switch to idle mode from the connected mode for receiving the secondary notification from the network. 
         [0013]    Other aspects, advantages, and salient features of the disclosure will become apparent to those skilled in the art from the following description, which, taken in conjunction with annexed drawings, discloses various embodiments of the present disclosure. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0014]    The above and other aspects, features, and advantages of certain embodiments of the present disclosure will be more apparent from the following description taken in conjunction with the accompanying drawings, in which: 
           [0015]      FIG. 1  illustrates a general block diagram of a User Equipment (UE) according to various embodiments of the present disclosure; 
           [0016]      FIG. 2  illustrates a sequence diagram between a UE and a network when auto disconnect of a call is configured in the UE according to various embodiments of the present disclosure; 
           [0017]      FIG. 3  illustrates a sequence diagram between a UE and a network when auto disconnect of a call is not configured in the UE according to various embodiments of the present disclosure; 
           [0018]      FIG. 4  illustrates a sequence diagram between a UE and a network when a forceful Radio Resource Control (RRC) connection release is done locally in the UE when a network fails to or otherwise does not respond according to various embodiments of the present disclosure; and 
           [0019]      FIG. 5  illustrates a computing environment implementing the application according to various embodiments of the present disclosure. 
       
    
    
       [0020]    Throughout the drawings, it should be noted that like reference numbers are used to depict the same or similar elements, features, and structures. 
       DETAILED DESCRIPTION 
       [0021]    The following description with reference to the accompanying drawings is provided to assist in a comprehensive understanding of various embodiments of the present disclosure as defined by the claims and their equivalents. It includes various specific details to assist in that understanding but these are to be regarded as merely exemplary. Accordingly, those of ordinary skill in the art will recognize that various changes and modifications of the various embodiments described herein can be made without departing from the scope and spirit of the present disclosure. In addition, descriptions of well-known functions and constructions may be omitted for clarity and conciseness. 
         [0022]    The terms and words used in the following description and claims are not limited to the bibliographical meanings, but, are merely used by the inventor to enable a clear and consistent understanding of the present disclosure. Accordingly, it should be apparent to those skilled in the art that the following description of various embodiments of the present disclosure is provided for illustration purpose only and not for the purpose of limiting the present disclosure as defined by the appended claims and their equivalents. 
         [0023]    It is to be understood that the singular forms “a,” “an,” and “the” include plural referents unless the context clearly dictates otherwise. Thus, for example, reference to “a component surface” includes reference to one or more of such surfaces. 
         [0024]    The various embodiments herein achieve a method and a system that guide a User Equipment (UE) to take appropriate steps to enter an idle mode where it can receive the secondary notification through Cell Broadcasting Service (CBS) messages. The method is provided in case of a scenario when the UE receives an Earthquake and Tsunami Warning System (ETWS) message when it is in connected mode. 
         [0025]    There exist different methods that can be used to go to an idle mode to receive secondary notification through CBS messages when ETWS primary notification messages are received in Dedicated CHannel (DCH) or Forward Access CHannel (FACH) states in the UE. 
         [0026]    If the UE is in DCH or FACH state due to a Circuit Switching (CS) call, a Packet Switching (PS) call or CS or PS signaling, and if an ETWS primary notification message is received, since the ETWS related secondary notification is also very important, a user can decide to release the current connection and go to idle mode or cell Paging CHannel (CELL_PCH) or Universal Terrestrial Radio Access Network (UTRAN) Registration Area Paging CHannel (URA_PCH) states to receive the secondary notification messages. Further, the same can be done automatically without user intervention, if it is already configured by the user in the UE or an option of a pop-up indication message shall be given to seek user permission to go to an idle or CELL_PCH or URA_PCH state. In both cases, the method sends a Signaling Connection Release Indication (SCRI) message with a cause set as “Release connection to receive CBS”. In this way, when the network receives the SCRI Message with the cause set as “Release connection to receive CBS”, it can understand the purpose of the request from the UE and take appropriate actions to move the UE to either idle mode or URA_PCH or CELL_PCH state. In an embodiment, the network can also move the UE to CELL_PCH or URA_PCH state for the request sent by the UE in which case the UE can receive the secondary notifications. Once the UE receives the “Radio Resource Control (RRC) Connection Release” message from the network, it shall follow the release procedure as mentioned in the 3rd Generation Partnership Project (3GPP) specification 25.331 before entering to idle Mode. 
         [0027]    Referring now to the drawings, and more particularly to  FIGS. 1 through 5 , where similar reference characters denote corresponding features consistently throughout the figures, there are shown various embodiments. 
         [0028]      FIG. 1  illustrates a general block diagram of a UE according to various embodiments of the present disclosure. 
         [0029]    Referring to  FIG. 1 , the UE  100  comprises a network interface module  101 , a display module  102 , a storage module  103  and a controller module  104 . The network interface module  101  helps the user to select a particular network within a geographical area. The display module  102  provides a user interface with which the user can input a selection to the UE. The storage module  103  comprises a memory which can be an internal memory or external memory. If implemented as an external memory, the storage module  103  can be a memory card connected to the UE  100 . The controller module  104  controls all the functions and operations within the UE  100 . 
         [0030]    Throughout the description the term UE and communication device is used interchangeably. 
         [0031]    In an embodiment, the UE  100  can be a mobile device, a tablet, a Personal Digital Assistants (PDA), and so on. 
         [0032]      FIG. 2  illustrates a sequence diagram between a UE and a network when auto disconnect of a call is configured in the UE according to various embodiments of the present disclosure. 
         [0033]    Referring to  FIG. 2 , the UE  100  is in the connected state at operation  211 , which can be either DCH or FACH. When an earthquake or tsunami situation occurs at operation  213 , the network  200  to which the UE  100  is connected sends an ETWS message to the UE  100  at operation  201 . 
         [0034]    In an embodiment, ETWS messages are primary notification messages which are sent by the network  200  as a warning or alert message whenever an earthquake, a tsunami or any other natural disaster happens in an area. 
         [0035]    ETWS primary notification messages mainly carry the information related to a disaster in a very short message. In an embodiment, the ETWS messages are sent to the UE  100  based on the regulations from the government. 
         [0036]    The UE  100  determines whether an auto disconnect of a call is configured by the user at operation  202 . If the UE  100  determines at operation  202  that the auto disconnect of call is configured by the user, then the UE  100  sends an SCRI to the network  200  at operation  203 . This SCRI includes an indication that informs the network  200  to release the connection to receive secondary notification through CBS messages. 
         [0037]    Upon receiving the SCRI from the UE  100 , the network  200  initiates a procedure to release RRC connection and/or Iu connection at operation  204 . 
         [0038]    The network  200  informs the UE  100  about RRC connection release at operation  205 . Then, the UE  100  sends the RRC connection release complete message to network  200  at operation  206 . 
         [0039]    At operation  207 , the UE enters an idle mode after releasing the connection and receives the secondary notification through CBS messages from the network  200  at operation  208 . 
         [0040]    In an embodiment, the secondary notification messages are generally CBS messages which are broadcasted in a cell of an affected area. Generally, after ETWS primary notification messages have been sent, the network sends secondary notification messages through CBS messages. 
         [0041]      FIG. 3  illustrates a sequence diagram between a UE and a network when auto disconnect of a call is not configured in the UE according to various embodiments of the present disclosure. 
         [0042]    Referring to  FIG. 3 , the UE  100  is in the connected mode at operation  211 , which can be either DCH or FACH. When an earthquake or tsunami situation occurs at operation  213 , the network  200  to which the UE  100  is connected sends an ETWS message to the UE  100  at operation  201 . 
         [0043]    The UE determines whether auto disconnect of a call is configured by the user at operation  301 . If the UE  100  determines at operation  301  that auto call disconnect is not configured by the user, then the UE  100  triggers a pop-up indication message to the user for obtaining a confirmation from the user for releasing the connection at operation  302 . 
         [0044]    If the user provides confirmation to the UE  100  through the pop-up indication at operation  302  for releasing the connection, then the UE  100  sends an SCRI at operation  303 . This SCRI may include an indication of “Release connection to receive CBS” that informs the network  200  to release the connection to receive secondary notification through CBS messages. 
         [0045]    Upon receiving the SCRI message from the UE  100 , the network  200  initiates a procedure to release the RRC connection and/or Iu connection at operation  304 . The network  200  sends an RRC connection release message to the UE  100  at operation  305 . Then, the UE  100  sends the RRC connection release complete message to network  200  at operation  306 . Further, the UE  100  enters an idle mode at operation  307  and receives the secondary notification through CBS messages from the network  200  at operation  308 . 
         [0046]    Alternatively, if the user of the UE  100  is not interested in receiving secondary notification message from the network or if the user is not providing a confirmation to the pop-up indication message generated by the UE  100  at operation  302 , then the UE  100  waits for the network action. 
         [0047]    If the UE  100  does not support sending “Release connection to receive CBS” cause in the SCRI message, it can choose to send the SCRI message with the cause set as “any other cause.” 
         [0048]    ASN1 changes proposed to 3GPP UMTS, RRC spec 25.331: 
         [0049]    10.3.3.37a Signaling Connection Release Indication Cause 
         [0050]    This information element is used to indicate to the UTRAN that there is no more PS data for a prolonged period. 
         [0000]    
       
         
               
               
               
               
               
               
             
               
               
               
             
           
               
                 TABLE 1 
               
               
                   
               
               
                 Information 
                   
                   
                   
                   
                   
               
               
                 Element/ 
                   
                   
                 Type and 
                 Semantics 
               
               
                 Group name 
                 Need 
                 Multi 
                 Reference 
                 description 
                 Version 
               
               
                   
               
             
             
               
                   
               
             
          
           
               
                 Signaling 
                 MP 
                 Enumerated 
               
               
                 Connection 
                   
                 (UE Requested 
               
               
                 Release 
                   
                 PS Data 
               
               
                 Indication 
                   
                 session end, 
               
               
                 Cause 
                   
                 any other cause, 
               
               
                   
                   
                 Release connection 
               
               
                   
                   
                 to receive CBS) 
               
               
                   
               
             
          
         
       
     
         [0051]      FIG. 4  illustrates a sequence diagram between a UE and a network when a forceful RRC connection release is done locally in the UE when a network fails to respond or does not respond according to various embodiments of the present disclosure. 
         [0052]    Referring to  FIG. 4 , the UE  100  is in connected mode at operation  211 , which can be either DCH or FACH. When an earthquake or tsunami situation occurs at operation  213 , the network  200  to which the user is connected sends an ETWS message to the UE  100  at operation  201 . 
         [0053]    The UE  100  determines whether auto disconnect of a call is configured by the user at operation  301 . If the UE  100  determines at operation  301  that auto disconnect of a call is not configured by the user, then the UE  100  triggers a pop-up indication message to the user for obtaining a confirmation from the user for releasing the connection at operation  302 . 
         [0054]    If the user provides confirmation to the UE  100  through the pop-up indication message at operation  302  for releasing the connection, then the UE  100  sends an SCRI at operation  303 . This SCRI may indicate any other cause for disconnecting the call (either “any other cause” or “Release connection to receive CBS”). 
         [0055]    After sending the SCRI, if the UE  100  does not receive any downlink message from the network  200  to move the UE  100  to either idle or CELL_PCH or URA_PCH state at operation  401 , the UE  100  may release the RRC Connection locally either immediately or after a certain time at the UE  100  at operation  402 . 
         [0056]    In case the network  200  sends (not shown) any downlink message to move the UE  100  to idle, CELL_PCH or URA_PCH, then the UE  100  shall follow the corresponding downlink message procedure and enter (not shown) either idle mode, CELL_PCH or URA_PCH state. 
         [0057]    The UE receives secondary notification through CBS messages from the network  200  after moving to idle mode or CELL_PCH or URA_PCH states at operation  403 . 
         [0058]    Alternatively, if the user of the UE  100  is not interested in receiving a secondary notification message from the network  200  or if the user does not provide a confirmation to the pop-up indication message generated by the UE  100  at operation  302 , then the UE  100  waits for the network action. 
         [0059]    The method for receiving the secondary notification message after receiving the ETWS message from the network is explained with an example as described herein. 
         [0060]    The user configures the mobile device to receive the secondary notification message automatically or with manual instructions by changing the settings within the menu of the mobile device. Further, there may exist ETWS message settings within the menu of the mobile device which the user can activate. Now, the network to which the mobile device is connected sends the ETWS message upon some occurrence of a disaster such as an earthquake, a tsunami and the like. 
         [0061]    When the mobile device is not configured to receive a secondary notification message from the network automatically, then the user receives a pop-up indication in the mobile device to inform the user that the current ongoing CS or PS call is to be disconnected to receive the secondary notification from network. 
         [0062]    If the user is interested in receiving the secondary notification message, then the user provides a confirmation to the pop-up indication message for releasing the connection and receiving the secondary notification. Upon receiving the CS or PS call release confirmation from the user, the mobile device receives the secondary notification including information such as refugee camps, government aid, help centers and the like after entering the idle mode. 
         [0063]      FIG. 5  illustrates a computing environment for implementing the application according to various embodiments of the present disclosure. 
         [0064]    Referring to  FIG. 5 , the computing environment  500  comprises at least one processing unit  510  that is equipped with a control unit  512  and an Arithmetic Logic Unit (ALU)  514 , a memory  522 , a storage unit  524 , a plurality of networking devices  532 , and a plurality of Input/Output (I/O) devices  531 . 
         [0065]    The processing unit  510  is responsible for processing the instructions of the algorithm. The processing unit  510  receives commands from the control unit  512  in order to perform its processing. Further, any logical and arithmetic operations involved in the execution of the instructions are computed with the help of the ALU  514 . 
         [0066]    The overall computing environment can be composed of multiple homogeneous and/or heterogeneous cores, multiple CPUs of different kinds, special media and other accelerators. Further, the process unit  510  may be located on a single chip or over multiple chips. 
         [0067]    The algorithm comprising instructions and codes required for the implementation are stored in either the memory  522  or the storage  524  or both. At the time of execution, the instructions may be fetched from the corresponding memory  522  and/or storage  524 , and executed by the processing unit  510 . 
         [0068]    In case of any hardware implementations, various networking devices  532  or external I/O devices  531  may be connected to the computing environment  500  to support the implementation through the networking unit  532  and the I/O device unit  531 . 
         [0069]    The various embodiments disclosed herein can be implemented through at least one software program running on at least one hardware device and performing network management functions to control the elements. The elements shown in  FIGS. 1 through 5  may include blocks which can be at least one of a hardware device, or a combination of hardware device and software module. 
         [0070]    While the present disclosure has been shown and described with reference to various embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present disclosure as defined by the appended claims and their equivalents.