Abstract:
A method comprises registering, by an enhanced CPM server, to receive IMS registrations for a client device, receiving, by the enhanced CPM server, a message intended for the client device, storing the message in a network store, setting a Message Waiting Indicator flag in a HLR associated with the client device, receiving, from the HLR, an alert message that the client device has registered in a non-IMS network, and delivering, by the enhanced CPM server, at least a reference to the message stored in the network store to the client device.

Description:
RELATED APPLICATION 
     This application claims the benefit of Provisional Patent Application Ser. No. 61/759,778, entitled “Enhanced Converged IP Message Server System and Method,” filed on Feb. 1, 2013. 
    
    
     FIELD 
     The present disclosure primarily relates to an enhanced Converged IP Message server (CPM) system and method. 
     BACKGROUND 
     The 3rd Generation Partnership Project (3GPP) has defined the IP Multimedia Subsystem (IMS) as the service engine or service delivery architecture for next-generation IP networks. The IMS includes a set of network nodes that provide various multimedia services and control calls in a mobile communication network environment. The IMS combines an Internet Protocol (IP) network with the mobile communication environment. Further, under standards developed by Open Mobile Alliance (OMA), there has been a convergence of messaging services called “Converged IP Messaging (CPM) Service” that is a Session Initiation Protocol (SIP)-based service capable of servicing users of conventional Short Message Service (SMS), Multimedia Messaging Service (MMS), and Instant Messaging (IM) services, etc., as well as users of CPM service. 
    
    
     
       DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a simplified block diagram of an exemplary embodiment of the IMS (IP Multimedia Subsystem) Centralized Services (ICS) architecture  10 ; 
         FIG. 2  is an exemplary block diagram of a CPM service system  30  according to the teachings of the present disclosure; and 
         FIG. 3  is a message flow diagram. 
     
    
    
     DETAILED DESCRIPTION 
       FIG. 1  is a simplified block diagram of an exemplary embodiment of the IMS (IP Multimedia Subsystem) Centralized Services (ICS) architecture  10 . 3GPP (3rd Generation Partnership Project) defines IMS as the service engine for next-generation IP (Internet Protocol) networks. ICS enables IMS services for traditional circuit switched (CS) voice access by legacy 2G, 3G, and fixed User Equipment (UE)  12 , such as PSTN (Public Switched Telephone Network) and GSM (Global System for Mobile) telephones. With ICS, user sessions are anchored in the IMS network when UEs access via Packet-Switched (PS) access networks  20  or CS access networks, which may be wireless technologies, wireline technologies, and broadband access technologies. For the purpose of the present disclosure, the access technologies may include, for example, radio access technologies selected from IEEE 802.11a technology, IEEE 802.11b technology, IEEE 802.11g technology, IEEE 802.11n technology, GSM/EDGE Radio Access Network (GERAN) technology (both CS and PS domains), Universal Mobile Telecommunications System (UMTS) technology, and Evolution-Data Optimized (EVDO) technology, etc. 
     The UEs (User Equipment) may be enhanced UEs  14  that support ICS capability, but UEs  12  without ICS capability are also supported by ICS. Broadband access technologies may include wireless local area networks or WLANs, Wi-MAX networks as well as fixed networks such as DSL, cable broadband, etc. With ICS, IMS sessions using CS media bearer are treated as standard IMS sessions for the purpose of service control and service continuity. The 3GPP ICS standard defines signaling mechanisms between the UE and IMS network for service continuity when using Circuit-Switched access for media transport. The UEs may include any electronic device that is capable of interfacing with the above-described networks, such as mobile telephones, a tablet computer, a laptop computer, Google Glasses, a wearable technology device, a GPS device, a Bluetooth device, etc. Such electronic device may also be installed on-board a vehicle or another mobile platform. 
     The network includes legacy MSC (Mobile Switching Center) servers  16 , as well as MSC servers  18  that have been enhanced to support ICS. MSCs enhanced for ICS support both mobile-originated and mobile-terminated calls for ICS UEs  14  (CPM-capable) and non-ICS UEs  12  (non-CPM capable). Enhanced MSC  18  may act as an IMS client for the UE, or via an Intelligent Network (IN) node that communicates with the MSC server via CAP (CAMEL Application Part). 
     The enhanced CPM system and method described herein is a mechanism to ensure that a subscriber receives timely notification of a Converged IP Message (CPM message) whether that subscriber registers in an IMS network or another mobile network which supports the SMS, MMS, and IM services but not IMS signaling or messaging. 
       FIG. 2  is an exemplary block diagram of a CPM service system  30  according to the teachings of the present disclosure. A plurality of User Equipment (UEs)  32  may be CPM-capable as well as non-CPM capable. As provided above, the UE  34  is a device or terminal that is capable of accessing the mobile communication network. The UE  34  typically includes a controller  36 , a messaging client  37 , and a transceiver  38 . Not shown explicitly, the UE  34  also may include or is associated with a display to present information to the user, and a user interface for receiving user input. Additional capabilities may include an imaging system that is configured to take a photograph, and/or read a machine-readable code. UE and UE-B are interchangeable terms used herein. 
     The CPM service system  30  further includes an enhanced CPM server  40  is configured to manage and support CPM messaging service. It is further configured to communicate with the IMS core and other functional entities or network nodes. In addition, non-CPM server  44  is configured to provide message delivery services other than CPM, such as SMS, MMS, and IM. The network further includes a CPM store  46  configured to store data such as CPM messages and other media. Users are able to persistently store and retrieve all messaging history in the network, including all messages, conversations/chats and file transfers. The network also includes a Home Location Register (HLR)  48  that is configured to store subscriber information and authenticate subscribers in a mobile network. 
     Referring to  FIG. 3 , the CPM server sends a message to the VideoMail server notifying it of message and other content intended for the UE-B, referenced by numeral  50 . Referenced by numeral  51 , the CPM server may send a message and other content intended for the UE-B client to the CPM store. The CPM store stores the message and other content intended for the UE-B. The VideoMail server is then configured to send a SIP notification message of a new event to the UE-B. 
     Referenced by numeral  52 , the UE-B is not available to receive the message. The CPM (or VideoMail) server sends a registration event information subscription message to the IMS core, and further sets the MWI (Message Waiting Indicator) flag in the HLR of the UE-B through use of the Send Routing Information (SRI) for Short Message SS7 operation as defined in the GSM specifications. 
     Referenced by numeral  53 , if the subscriber subsequently registers in the IMS network then the CPM message is delivered (normal procedure). The UE-B sends a subscribe message to the VideoMail server, which subscribes for an event of notification. The VideoMail server sends a notify message to the UE-B about the pending message in the CPM store. The UE-B then sends an object fetch request to the CPM store, which results in the stored message and other content to be send to the UE-B. 
     Referenced by numeral  54 , if the UE-B comes online in a GSM (2G or 3G network), an alert message is sent by the HLR of the UE-B to the VideoMail server. Further, as referenced by numeral  55 , if the UE-B does not subscribe or registers with an Application Server (AS) within a predetermined timeout period, then it is assumed that the subscriber is only reachable over SMS or another non-CPM service. The VideoMail server sends a delivery short message that may contain a pointer, reference, or URL (Uniform Resource Locator) pointing to the CPM message content, allowing the UE-B to retrieve the content using, e.g., a web browser on the mobile device or any other internet connected browser. 
     The features of the present invention which are believed to be novel are set forth below with particularity in the appended claims. However, modifications, variations, and changes to the exemplary embodiments described above will be apparent to those skilled in the art, and the system and method described herein thus encompasses such modifications, variations, and changes and are not limited to the specific embodiments described herein.