Abstract:
A virtual mobile node ( 22 ) has a pseudo HLR ( 23 ) and a pseudo MSC ( 24 ). It transfers an SMS message between an entity in a foreign mobile network having a different technology to an SMS entity connected to the local network. The pseudo HLR and MSC are both located in the home network but operate with the protocol of the foreign network. Thus, communication between the home and foreign networks is via SS7 signalling.

Description:
FIELD OF THE INVENTION  
         [0001]    The invention relates to Short Message Services (SMS), both for person-to-person messaging and for person-to-application server messaging for two-way SMS services.  
         PRIOR ART DISCUSSION  
         [0002]    At present, many network operators are only in position to offer SMS services to users who access a mobile network using the same technology as the network operator. SMS Services includes both person-to-person messaging, application server-to-person messaging and person-to-application server messaging; that is there is always a mobile device involved. For example, a CDMA operator can only offer SMS services to his own subscribers or subscribers of other CDMA network operators. The CDMA operator cannot offer these services to subscribers of GSM networks.  
           [0003]    The invention addresses this problem.  
         SUMMARY OF THE INVENTION  
         [0004]    According to the invention, there is provided a mobile network node comprising means for interfacing with an entity of a local network in which the node is located and with an entity of a foreign network having a non-compatible protocol for communication of short messages between the networks, characterised in that,  
           [0005]    the node comprises a pseudo network element operating with the protocol of the foreign network and comprising means for communicating with an actual element of the foreign network.  
           [0006]    In one embodiment, the pseudo network element is a pseudo HLR.  
           [0007]    In another embodiment, the node further comprises a pseudo MSC operating with the protocol of the foreign network and being connected to the pseudo HLR.  
           [0008]    In a further embodiment, the node comprises means for interfacing with a short message interworking gateway in the home network for bi-directional transfer of short messages.  
           [0009]    In one embodiment, said interfacing means comprises a pseudo SMSC operating with the protocol of the foreign network.  
           [0010]    In another embodiment, the pseudo network element comprises means for communicating with the foreign network actual element via a signalling network.  
           [0011]    In a further embodiment, the signalling network is an SS7 network.  
           [0012]    In another aspect, the invention provides a mobile network node for operating in a home mobile network, the node comprising:  
           [0013]    a pseudo HLR comprising means for operating with the protocol of a foreign network, said pseudo HLR comprising means for receiving a short message from an SMSC of the foreign network;  
           [0014]    a pseudo MSC comprising means for operating with the protocol of the foreign network, and for receiving a short message from the pseudo HLR;  
           [0015]    means for routing the short message from the pseudo MSC to an SMSC of the home network.  
           [0016]    In one embodiment, the pseudo MSC comprises means for terminating the message vis-à-vis the foreign network.  
           [0017]    In another embodiment, the routing means comprises means for interfacing with a home network SMSC interworking gateway.  
           [0018]    In a further embodiment, said interfacing means comprises an SMSC operating with the protocol of the foreign network.  
           [0019]    According to a further aspect, the invention provides a method of delivery of a short message from a foreign network to a user or an application server in a home network, the foreign network operating with a protocol which is different from that of the home network, the method comprising the steps of:  
           [0020]    an SMSC of the foreign network routing the message to a pseudo HLR in the home network, the pseudo HLR operating with the protocol of the foreign network;  
           [0021]    routing the message to a pseudo MSC in the home network, the pseudo MSC operating with the protocol of the foreign network;  
           [0022]    routing the message to an SMSC of the home network using an SMSC access protocol;  
           [0023]    the home network SMSC routing the message to the destination user or application server.  
           [0024]    In one embodiment, the message is routed to the home network SMSC by a pseudo SMSC located in the home network and operating with the protocol of the foreign network.  
           [0025]    In another embodiment, the pseudo SMSC transmits the message to an interworking gateway, which performs protocol conversion and routes the message to the home network SMSC.  
         DETAILED DESCRIPTION OF THE INVENTION 
     
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0026]    The invention will be more clearly understood from the following description of some embodiments thereof, given by way of example only with reference to the accompanying drawings in which:  
         [0027]    [0027]FIGS. 1 and 2 are flow diagrams illustrating inter-technology message transfer between networks (deploying different wireless technologies) for SMS services;  
         [0028]    [0028]FIG. 3 is a diagram illustrating deployment of a virtual mobile node; and  
         [0029]    [0029]FIG. 4 is a signal transfer diagram. 
     
    
     DESCRIPTION OF THE EMBODIMENTS  
       [0030]    Referring to FIG. 1, a virtual mobile node (VM), deployed in CDMA Operator A&#39;s network, receives an SMS message from an SMSC B of a GSM network B over SS7 protocols. The message is destined to a person who is a subscriber of CDMA operator A and is thus equipped with a CDMA mobile station.  
         [0031]    The VM node forwards the message to the Operator A&#39;s SMSC over an internal IP network. In the example the VM node uses SMPP to transfer the message via a message application router (MAR) as an intermediary gateway. This procedure allows CDMA network operator A to offer an SMS service where its subscribers can receive messages from other mobile users equipped with “different technology” handsets. The interconnect to the foreign network is SS7-based.  
         [0032]    The reverse direction is shown in FIG. 2. In this case, the operator&#39;s own subscriber sends an SMS message to a GSM user of network B. The message can be sent either autonomously or as a reply to a received message from the GSM user. Subscriber A originates the message as normal, thus causing the SMS to be stored in his home SMSC A. The SMSC A determines that the destination address is not a CDMA mobile and forwards the SMS to the MAR interworking gateway over an IP or X.25 based protocol (e.g. UCP, SMPP). The MAR forwards the message to the VM node which is acting in the mode of an SMSC. The VM node determines that the destination is a GSM mobile and delivers the message over SS7 using GSM MAP and GSM 03.40 protocols to GSM user B.  
         [0033]    The deployment is shown in FIG. 3. The VM node presents GSM HLR and MSC functions in operator A&#39;s network to the GSM network B. These are referred to as a pseudo HLR and a pseudo MSC. This means that they operate with the foreign network&#39;s technology (protocol) but are entities of the home network. Because they operate with the foreign network&#39;s protocol they can communicate with it via SS7.  
         [0034]    In the other direction the VM provides a GSM Gateway MSC function for a mobile terminating (MT) SMS to an international GSM user in the foreign network.  
         [0035]    GSM Network to Hosting TDMA, CDMA or PDC Network  
         [0036]    In more detail, the procedures involved for message transfer from a GSM network to a hosting TDMA, CDMA or PDC network are:  
         [0037]    1. Querying a pseudo GSM HLR to determine the serving MSC and the IMSI.  
         [0038]    2. Sending the message to the pseudo GSM MSC, using the address information from action 1 to address GSM pseudo MSC.  
         [0039]    3. Routing and Sending the message over an SMSC access protocol (e.g. SMPP) for transfer to the home SMSC. In performing this step, the VM operates as an SMSC in the home network, but using the foreign technology. Thus, the VM has three network entities, namely a HLR, an MSC, and an SMSC. All three operate with the foreign network technology, but are located in the home network.  
         [0040]    Referring to FIG. 4 the foreign (GSM) SMSC is indicated by  20 , the VM node by  22 , and the MAR by  21 . Within the VM node  22  there is a pseudo HLR  23  and a pseudo MSC  24   
         [0041]    The node  22  acts as a pseudo GSM HLR, that will return the recipient (virtual) mobile number in the IMSI and optionally the serving MSC address parameter in the response signal (SRI-SM response). The node  22  also acts as a pseudo GSM MSC to accept the mobile terminated short message and, retrieving the original (virtual) mobile number digits from the IMSI and serving MSC address parameters. The node  22  acts as a pseudo SMSC and forwards the message to the SMSC interworking gateway  21  for transfer to the home SMSC.  
         [0042]    The node  22  accepts a Short Message being delivered by another GSM SMSC. This requires the following:  
         [0043]    Support for GSM MAP Forward Short Message (GSM) operation for message termination.  
         [0044]    Support for reception of GSM 03.40 SMS-DELIVER Transfer Layer PDU  
         [0045]    Modified parameter and error handling.  
         [0046]    Appropriate message validation, address translation and onward routing  
         [0047]    As shown in FIG. 4, the virtual mobile node  22  interfaces with a foreign SMSC  20  and with a home interworking gateway  21 . It terminates the message delivery from a foreign GSM SMSC and forwards it to the SMSC interworking gateway  21 .  
         [0048]    The following are the signals:  
         [0049]    1a) MO Short Message (GSM 03.40) from MS user to foreign SMSC. Message is addressed to MSISDN assigned to recipient.  
         [0050]    1b) Internal SMSC request to deliver the SMS message.  
         [0051]    2) MAP_SEND_ROUTING_INFO_FOR_SM (msisdn=“recipient MSISDN”)  
         [0052]    3) MAP_SEND_ROUTING_INFO_FOR_SM_ACK. The location information (network_number) is the GT network address of the virtual mobile node. A virtual IMSI is also returned—it&#39;s digits are a function of the original MSISDN.  
         [0053]    4) MAP_MT_FORWARD_SHORT_MESSAGE. IMSI and network address are included.  
         [0054]    5) MAP_MT_FORWARD_SHORT_MESSAGE_ACK  
         [0055]    6) void  
         [0056]    7) Delivery to SMSC interworking gateway (e.g. SMPP SM_DELIVER)  
         [0057]    8) Delivery Acknowledgement from SMSC interworking gateway (e.g. SMPP SM_DELIVER_resp)  
         [0058]    9) In case of delivery failure at step 7 due to a temporary condition, a subsequent retry of delivery to SMSC interworking gateway (e.g. SMPP SM_DELIVER).  
         [0059]    10) Delivery Acknowledgement from SMSC Interworking Gateway (e.g. SMPP SM_DELIVER_resp)  
         [0060]    Routing Information Enquiry  
         [0061]    The following are the signals and features.  
         [0062]    SendRoutingInfoForSM requests may be received by the virtual mobile node (using HLR SSN corresponding number).  
         [0063]    Support for v1, v2 and v3 of SRI-SM.  
         [0064]    A response is returned by the virtual mobile node, with a pre-defined MSC number and IMSI or LMSI generated according to the MSISDN.  
         [0065]    A limited range of errors is supported including unidentified subscriber, system failure, unexpected data value, and data missing.  
         [0066]    SMS Forwarding  
         [0067]    The following are the signals and features.  
         [0068]    Mobile Terminated Forward Short Message is received by the virtual mobile node (using MSC corresponding number).  
         [0069]    Reconstruction of the original destination number from the IMSI and (if necessary) the MSC address parameters.  
         [0070]    Virtual Mobile will decode the MT-FSM payload as SMS-DELIVER PDU rather than SMS-SUBMIT PDU  
         [0071]    In a manner identical to SMSC message validation, address translation and message routing can be performed  
         [0072]    Support for v1, v2 and v3 of MT-FSM  
         [0073]    A limited range of errors is supported, including unidentified subscriber, system failure, unexpected data value, data missing, illegal subscriber, facility not supported, and SM delivery failure  
         [0074]    SMS message is routed using the destination number over SMPP (or other proprietary SMSC access protocol) to the SMSC interworking gateway which forwards it to the home SMSC. The home SMSC uses standard ANSI-41 procedures (in the case of TDMA and CDMA networks) or ISUP procedures (in the case of PDC networks) to deliver the message to the recipient mobile.  
         [0075]    TDMA or CDMA to Hosting GSM, TDMA, CDMA or PDC Network  
         [0076]    The procedures involved for message transfer from a TDMA or CDMA network to a hosting GSM, TDMA, CDMA or PDC network are:  
         [0077]    1. Querying a pseudo ANSI-41 HLR to determine the serving MSC and the MIN (in the case of MIN been different from directory number).  
         [0078]    2. Sending the message to the pseudo ANSI-41 MSC 24, using the address information from action 1 to address pseudo ANSI-41 MSC.  
         [0079]    3. Routing and sending the message over an SMSC access protocol (e.g. SMPP) for transfer to the home SMSC.  
         [0080]    The node  22  acts as a pseudo ANSI-41 HLR, that will return the recipient (virtual) mobile number in the MIN and optionally the serving MSC Address parameter in the response signal (SMSREQ response). The node  22  acts as a pseudo ANSI-41 MSC to accept the mobile terminated short message and, retrieving the original (virtual) mobile number digits from the MIN and Serving MSC Address parameters. The node  22  acts an SMSC and forwards the message to the SMSC interworking gateway  21  for transfer to the home SMSC.  
         [0081]    The node accepts a short message being delivered by another ANSI-41 SMSC. This requires the following:  
         [0082]    Support for ANSI-41 Short Message Delivery Peer-to-Peer (SMDPP) MAP operation in mobile terminated direction.  
         [0083]    Support for reception of TDMA (IS-136) and CDMA (IS-637) SMS-DELIVER Teleservice Layer PDU.  
         [0084]    Modified parameter and error handling.  
         [0085]    Appropriate message validation, address translation and onward routing.  
         [0086]    As shown in FIG. 4, the virtual mobile node  22  emulates an ANSI-41 MSC and an ANSI-41 HLR, terminates the message delivery from a foreign ANSI-41 SMSC and forwards it to the SMSC interworking gateway  21 .  
         [0087]    The following are the signals:  
         [0088]    1a) MO Short Message (SMS-SUBMIT) from CDMA/TDMA MS user to foreign SMSC. Message is addressed to mobile directory number (MDN or MSISDN) assigned to recipient.  
         [0089]    1b) Internal SMSC request to deliver the SMS message.  
         [0090]    2) SMSREQ INVOKE (mdn=“destination directory number”)  
         [0091]    3) SMSREQ RETURN RESULT. The location information (SMS Address) is the SS7 network address of the virtual mobile node. An MIN number is also returned—it&#39;s digits are a function of the original directory number.  
         [0092]    4) SMDPP Invoke. MIN and MSC network address are included.  
         [0093]    5) SMDPP RETURN RESULT.  
         [0094]    6) void  
         [0095]    7) Delivery to SMSC Interworking Gateway (e.g. SMPP SM_DELIVER)  
         [0096]    8) Delivery Acknowledgement from SMSC Interworking Gateway (e.g. SMPP SM_DELIVER_resp)  
         [0097]    9) In case of delivery failure at step 7 due to a temporary condition, a subsequent retry of Delivery to SMSC Interworking Gateway (e.g. SMPP SM_DELIVER).  
         [0098]    10) Delivery Acknowledgement from SMSC Interworking Gateway (e.g. SMPP SM_DELIVER_resp)  
         [0099]    Routing Information Enquiry  
         [0100]    The following are the signals and features.  
         [0101]    SMSREQ requests may be received by the virtual mobile (using HLR SSN correspondingly Number).  
         [0102]    Support for Rev C, D and E of ANSI-41 SMSREQ.  
         [0103]    A response is returned by the Virtual Mobile, with a pre-defined MSC number and MIN generated according to the directory number (an appropriate algorithm is provisioned on the Virtual Mobile Node).  
         [0104]    A limited range of errors is supported, including “Invalid”, and “Denied”.  
         [0105]    SMS Forwarding  
         [0106]    The following are the signals and features.  
         [0107]    Mobile Terminated SMDPP is received by the virtual mobile (using MSC corresponding number).  
         [0108]    Reconstruction of the original destination number from the MIN and (if necessary) the MSC address parameters.  
         [0109]    Virtual mobile will decode the SMDPP payload (bearer data) as SMS-DELIVER PDU rather than SMS-SUBMIT PDU.  
         [0110]    In a manner similar to SMSC message validation, address translation and message routing can be performed.  
         [0111]    Support for Rev C, D and E of SMDPP.  
         [0112]    A limited range of errors (SMS Cause Codes) are supported, as follows:  
         [0113]    “Address Vacant” 
         [0114]    “Address translation failure” 
         [0115]    “Network Resource Shortage” 
         [0116]    “Network Failure” 
         [0117]    “Invalid Teleservice Id” 
         [0118]    “Destination out of Service” 
         [0119]    “Encoding Problem” 
         [0120]    “SMS Termination Denied” 
         [0121]    “Missing Expected Parameter” 
         [0122]    “Missing Mandatory Parameter” 
         [0123]    “Unrecognised Parameter Value” 
         [0124]    “Unexpected Parameter Value” 
         [0125]    “User Data Size Error” 
         [0126]    SMS message is routed using the destination number over SMPP (or other proprietary SMSC access protocol) to the SMSC interworking gateway which forwards it to the home SMSC. The home SMSC uses standard ANSI-41 procedures (in the case of different TDMA or CDMA network) or GSM MAP procedures (in case of GSM network) or ISUP procedures (in the case of PDC networks) to deliver the message to the recipient mobile.  
         [0127]    It will be appreciated that the invention provides a method for a TDMA operator to receive an SMS from a foreign GSM network and forward it to an SMSC for delivery to a local TDMA subscriber, for example. Other examples of uses are that it provides the following:  
         [0128]    a method for a TDMA operator to receive an SMS from a foreign CDMA network and forward it to an SMSC for delivery to a local TDMA subscriber,  
         [0129]    a method for a CDMA operator to receive an SMS from a foreign GSM network and forward it to an SMSC for delivery to a local CDMA subscriber,  
         [0130]    a method for a CDMA operator to receive an SMS from a foreign TDMA network and forward it to an SMSC for delivery to a local CDMA subscriber,  
         [0131]    a method for a GSM operator to receive an SMS from a foreign TDMA network and forwarding it to an SMSC for delivery to a local GSM subscriber,  
         [0132]    a method for a GSM operator to receive an SMS from a foreign CDMA network and forwarding it to an SMSC for delivery to a local GSM subscriber, and  
         [0133]    a computer based method for receiving an SMS from a foreign SMSC as a mobile terminated delivery; examining the destination number and forwarding it over an IP-based SMSC access protocol to an adjacent node in the operators network. The adjacent node can be an SMSC, or an SMSC interworking gateway or an SMS application server.  
         [0134]    Of course, the invention also allows routing to/from application servers which host SMS-initiated services.  
         [0135]    The invention is not limited to the embodiments described but may be varied in construction and detail.